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Dissertations / Theses on the topic 'Manufacturing, Machines, Tools'
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Vafadarshamasbi, Ana. "Feasibility analysis of using special purpose machines for drilling-related operations." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2017. https://ro.ecu.edu.au/theses/2029.
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This work focuses on special purpose machine tools (SPMs), providing a modular platform for performing drilling-related operations. One of the main challenges in using SPMs is selecting the most appropriate machine tool among many alternatives. This thesis introduces a feasibility analysis procedure developed to support decision-making through the assessment of the strengths and limitations of SPMs. To achieve this, technical and economic feasibility analyses, a sensitivity analysis, and an optimisation model were developed and a case study was provided for each analysis. The results indicated that although technical feasibility analysis leads decision-makers to select a feasible machine tool, complementary analyses are required for making an informed decision and improving profitability. Accordingly, a mathematical cost model was developed to perform economic and sensitivity analyses and investigate the profitability of any selected SPM configuration. In addition, an optimisation procedure was applied to the cost model in order to investigate the effect of process parameters and the SPM configuration on the decision-making. Finally, the developed analyses were then integrated into a model in a proper sequence that can evaluate whether the SPM is appropriate for producing the given part and achieving higher productivity. To validate this integrated model three different case studies were presented and results were discussed. The results showed that the developed model is a very useful tool in assisting manufacturers to evaluate the performance of SPMs in comparison with other alternatives considered from different perspectives.
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Ozkan, Sevda. "The Way Architectural Model As A New Collaborative Design Environment Talks With Machines." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609381/index.pdf.
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The scope of this study is to illustrate the relationship between computer-aided design (CAD) and computer-aided manufacturing (CAM) systems, and to show how architectural modeling should be positioned in the process of computer-aided design/computer-aided manufacturing (CAD/CAM) systems. The integration of computer aided technologies with architectural design is investigated in terms of design-production/fabrication interaction. The research has been based on a case study in which the CAD/CAM process from the initial design phase to the actual manufacturing of the design object has been explored. A design object is modeled using CAD and the model is manufactured using CAM in order to illustrate the process of CAD/CAM and its potentials related to architectural design and the construction/manufacturing/fabrication process of building. Thus, the study tries to demonstrate what digital tools can provide to the field of architecture, and lists the requirements for architectural modeling to acquire compatibility among the parts of the building process.
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Juckem, John R. "Aligning Sheboygan Area School District's metals/manufacturing machine tool curriculum to meet local needs." Menomonie, WI : University of Wisconsin--Stout, 2005. http://www.uwstout.edu/lib/thesis/2005/2005juckemj.pdf.
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Hoh, See Min. "Condition monitoring and fault diagnosis for CNC machine tools." Thesis, Cardiff University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295120.
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Lau, Pak Fai. "CNC machining accuracy enhancement by tool path compensation method /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202005%20LAU.
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Zhou, Erping. "An automated in-process measuring system for CCN machine tools." Thesis, Staffordshire University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295291.
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Lee, Dai Gil. "Manufacturing and testing of composite machine tool structures." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15265.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.
Vita.
Includes bibliographical references.
by Dai Gil Lee.
Ph.D.
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Teltz, Richard W. "Open architecture control for intelligent machining systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0006/NQ42883.pdf.
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Chan, Tsz Lung. "Performance enhancement of machining process by an add-on online measurement system /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?IELM%202008%20CHAN.
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Marshall, Simon. "The generation of machine tool cutter paths utilising parallel processing." Thesis, University of Hull, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287912.
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Roberts, Bryndan. "Integration of an electrical discharge machining module onto a reconfigurable machine tool." Thesis, Nelson Mandela Metropolitan University, 2014. http://hdl.handle.net/10948/6182.
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Electrical Discharge Machining (EDM) is a non-contact manufacturing process in which material is removed from a metal workpiece by high frequency electrical pulses produced between an electrode and the workpiece. EDM machines are usually stand-alone devices, and are quite expensive. The objective of this research was to integrate an EDM machine and an existing reconfigurable CNC machine tool, using a modular approach, to enable conventional milling and EDM to be conducted in a co-ordinated fashion on the same machine tool.
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Naish, Jane Catherine. "Process capability modelling for manufacturing process selection in an integrated simultaneous engineering workstation." Thesis, University of Strathclyde, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366813.
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Aitchison, David Robert. "Laser based cutting tool condition monitoring." Thesis, University of Hull, 1995. http://hydra.hull.ac.uk/resources/hull:3693.
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Steyn, Marisa. "Attributes and multi-criteria decision analysis in machine selection for process chains." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53308.
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Thesis (MEng)--University of Stellenbosch, 2003.ENGLISH ABSTRACT: The purpose of this project is to find a means to evaluate a number of machines to optimise a process chain. Firstly seven machine types were identified to be included in the study. These machine types include: broach machines, EDM machines, GNG lathes, engine lathes, drilling machines, milling machines and grinders. The information requirements for these machines in terms of attributes for three areas were identified. Functionality, economical and reliability and availability attributes were identified. These attributes were subsequently incorporated into a MS-Access database to provide a database of machine information. Several methods for comparing machines were studied and the decision then fell on one existing method to be used for machine evaluation. A new method was developed to use for evaluating machines. The existing method is the Analytic Hierarchy Process, whereas the new method developed, is called the Quotient Exponential Method. These methods were implemented in the MS-Access database to enable the user to evaluate machines by means of both methods. The results indicate that these methods provide the correct answers according to test values used. It should be noted that the decision methods should, however, only serve as an aid towards an answer and do not necessarily provide the final answer. The AHP process is very time-consuming for this project because of the large number of criteria evaluated.
AFRIKAANSE OPSOMMING: Die doel van hierdie projek is om "n manier te vind om masjiene te evalueer om sodoende "n proses-ketting te optimeer. Eerstens is besluit op die soorte masjiene wat ingesluit gaan word in die projek. Sewe soorte masjiene is gekies en sluit in: RNB draaibanke, masjiendraaibanke, boormasjiene, skuurders, elektriese ontladings masjiene, veelvuldige punt snymasjiene en rubeitelmasj iene. Die inligting-vereistes van die sewe masjiene, in terme van hul attribute vir drie areas, is vervolgens geïdentifiseer. Hierdie drie areas is funksionaliteit, koste, asook beskikbaarheid en betroubaarheid. Hierdie attribute word in "n MS-Access databasis gebruik om "n databasis van masjien-inligting te skep. Verskeie metodes vir die vergelyking en evaluasie van masjiene is bestudeer en daar is op een bestaande metode besluit vir die evaluering van "n aantal masjiene. Daarbenewens is ook "n nuwe metode ontwikkel vir die evaluering van masjiene. Die bestaande metode is die Analitiese Hiërargiese Proses, terwyl die nuwe metode die Kwosiënt Eksponensiële Metode genoem word. Altwee hierdie metodes is in MS-Access geïmplemeteer om die gebruiker in staat te stelom masjiene met albei metodes te vergelyk. Die resultate verkry toon aan dat die korrekte resultaat verkry word volgens die toetsdata wat ingevoer is ten opsigte van die twee metodes. Dit moet in gedagte gehou word dat hierdie metodes egter slegs as "n hulpmiddel tot besluitneming gebruik behoort te word en nie noodwendig die finale antwoord lewer nie. AHP is baie tydsaam gevind, aangesien die masjiene in die projek baie attribute bevat het.
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Chen, Jie. "Adaptive Scheduling and Tool Flow Control in Automated Manufacturing Systems." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/27159.
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The recent manufacturing environment is characterized as having diverse products due to mass customization, short production lead-time, and unstable customer demand. Today, the need for flexibility, quick responsiveness, and robustness to system uncertainties in production scheduling decisions has increased significantly. In traditional job shops, tooling is usually assumed as a fixed resource. However, when tooling resource is shared among different machines, a greater product variety, routing flexibility with a smaller tool inventory can be realized. Such a strategy is usually enabled by an automatic tool changing mechanism and tool delivery system to reduce the time for tooling setup, hence allows parts to be processed in small batches. In this research, a dynamic scheduling problem under flexible tooling resource constraints is studied. An integrated approach is proposed to allow two levels of hierarchical, dynamic decision making for job scheduling and tool flow control in Automated Manufacturing Systems. It decomposes the overall problem into a series of static sub-problems for each scheduling window, handles random disruptions by updating job ready time, completion time, and machine status on a rolling horizon basis, and considers the machine availability explicitly in generating schedules.
Two types of manufacturing system models are used in simulation studies to test the effectiveness of the proposed dynamic scheduling approach. First, hypothetical models are generated using some generic shop flow structures (e.g. flexible flow shops, job shops, and single-stage systems) and configurations. They are tested to provide the empirical evidence about how well the proposed approach performs for the general automated manufacturing systems where parts have alternative routings. Second, a model based on a real industrial flexible manufacturing system was used to test the effectiveness of the proposed approach when machine types, part routing, tooling, and other production parameters closely mimic to the real flexible manufacturing operations. The study results show that the proposed scheduling approach significantly outperforms other dispatching heuristics, including Cost Over Time (COVERT), Apparent Tardiness Cost (ATC), and Bottleneck Dynamics (BD), on due-date related performance measures under both types of manufacturing systems models. It is also found that the performance difference between the proposed scheduling approach and other heuristics tend to become more significant when the number of machines is increased. The more operation steps a system has, the better the proposed method performs, relative to the other heuristics. This research also investigates in what conditions (e.g. the number of machines, the number of operation steps, and shop load conditions) the proposed approach works the best, and how the performance of this proposed approach changes when these conditions change.
When tooling resource is shared, parts can be routed to machines that do not have all the required tools. This may result in higher routing flexibility. However, research work to date in sharing of tooling resources often places more emphasis on the real-time control and manipulation of tools, and pays less attention to the loading of machines and initial tool allocation at the planning stage. In this research, a machine-loading model with shared tools is proposed to maximize routing flexibility while maintaining minimum resident tools. The performance of the proposed loading heuristic is compared to that of a random loading method using hypothetically generated single stage system models. The study result indicates that better system performances can be obtained by taking into account the resident tooling ratio in assigning part types and allocating tools to machines at the initial planning stage.Ph. D.
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Shore, Paul. "Machining of optical surfaces in brittle materials using an ultra-precision machine tool." Thesis, Cranfield University, 1995. http://dspace.lib.cranfield.ac.uk/handle/1826/3610.
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Investigations of machining optical surfaces into brittle materials using an ultra precision machine tool are presented. The newly developed ultra precision NION machine is evaluated to gain a good appreciation of its operating performance. The machining accuracy capability of this machine is established by careful measurement of its motion accuracy, thermal and dimensional stability and loop stiffness. Corroboration of these measurements are provided by assessment of surfaces which were produced in soft 'easily machined' metal materials. It was found that surfaces smooth to -1 nm Ra could be produced on the NION machine and with a form error of less than 100 nm P-V. The main source of figure error, approximately 80 nm, was found to be caused by the synchronous axial error motion of the workhead spindle. Other elements of the machine, including thermal effects, incurred less than 25 nm of additional figure error. Assessment of the diamond turning process for the producing optical surfaces made in a number of important optical materials, which are ostensibly brittle, were undertaken. Turning tests were carried out to establish the relative difficulty for machining optical surfaces in these materials and to define the most important parameters which affect the attained surface quality. Assessment of the produced surfaces was based on their roughness quality, surface morphology and residual stress condition. It was found that diamond tool edge quality degraded with total cut distance. Tool cut distance was found to be a major influence on achievable material removal rate before micro-fractures became present at the surface. Surface quality and residual stress condition were also greatly influenced by the overall tool cut distance. Diamond grinding trials were also carried out using the NION machine tool. These grinding trials were carried out using a mode of grinding which permits complex shape optical surfaces to be produced. Various grinding technologies were employed to establish the optimum methods. Selected grinding trials were carried out to establish the dominate parameters affecting the optical quality. Assessment of the machined surfaces was in regard of their surface roughness, residual stress and severity of sub-surface micro cracking. It was found that grinding wheel specification was a major influence on surface quality and sub-surface damage. The level of residual stress associated with 'ductile' mode grinding was not found to prohibit its application toward the direct manufacture of optical elements. Selection of grinding parameters which ensured the grain depth of cut, GDOC, parameter did not exceed the materials critical depth, dc, allowed glass surfaces to be ground to 1-2 nm Ra. These ground glass surfaces appeared free of any surface fractures. Sub-surface assessments did however reveal small levels of micro-fractures hidden below the surface. Discussion of both machining processes is provided. Available material removal rates for each process is given when cutting a number of important optical materials. Conclusions regarding the production of both Infrared and visible wavelength optics using the NION machine tool are provided. Recommendations for future work to improve both the understanding of the processes and the effectiveness of applying the processes are suggested.
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Ren, Lan. "Integrated process planning for a hybrid manufacturing system." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Ren_09007dcc8046714a.pdf.
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Thesis (Ph. D.)--Missouri University of Science and Technology, 2008.Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 18, 2008) Includes bibliographical references.
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Lora-Soto, Anthony, Cristhoffer Morales-Silva, Jose Llontop-Jesus, and Nestor Mamani. "Process improvement proposal for the reduction of machine setup time in a copper transformation company using lean manufacturing tools." Springer, 2021. http://hdl.handle.net/10757/653764.
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This study aimed to identify the causes of significant problems existing in the metallurgical sector, and a solution is proposed for the setup process. We detail the theoretical background of the processes in the lean manufacturing methodology, which will be applied to a rolling machine. Further, we provide a brief description of the company and the sector’s problems. We describe success stories of companies that implemented various lean manufacturing tools. We also present some of the results achieved across sectors to gain an in-depth understanding of the technique and a practical support of the implemented model. Our proposal is based on the lean manufacturing methodology; tools such as Single Minute Exchanges of Dies, Kaizen, 5S, and value stream mapping (VSM) will be used to reduce setup times and to impact machine layout and productivity positively. We also show the implementation results of a pilot plan conducted in the company over a period of more than 3 months.Revisión por pares
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Wilcox, Steven John. "Cutting tool condition monitoring using multiple sensors and artificialintelligence techniques on a computer numerical controlled milling machine." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/1446.
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This work documents an investigation of the degradation of a variety of different tools whilst conducting milling operations on a computer numerical controlled (CNC) milling machine. The potential of a range of sensors to detect tool degradation has been investigated and the outputs have been incorporated into a monitoring system. Progressive degradation under nominal rough and finish face milling and rough groove milling has been investigated using a two point grooving tool and four and eight point face milling tools on En8, En24 and En24T workpiece materials. Rapid degradation of the cutting tool has also been observed under rough milling conditions using four and eight point face milling tools, whilst machining n8 and En24T materials in a variety of simulated and actual tool breakage situations. A limited investigation of the effect of the individual wear geometries associated with both progressive and instantaneous tool degradation has been conducted by simulating these geometries and carrying out rough miffing tests using a four point face milling tool on a workpiece of En8 material. Similarly, a limited investigation of the effect of machining on different machines has also been undertaken. A number of different sensing technologies have been used, including conventional sensors such as spindle current and cutting force but also novel sensing techniques such as Acoustic Emission. These have been combined using artificial intelligence techniques to provide automatic recognition of the tool wear state. Similarly, the feasibility of breakage detection/prediction has also been demonstrated.
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Matthews, Mark Walter. "A machine vision based non-contact measuring tool for mensuration in industry and manufacturing." Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/17012.
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Bibliography: leaf 53.This thesis report discusses the design, implementation and testing of a non-contact measuring tool based on the principle of stereo photogrammetry. The system uses a pair of CCD video cameras and a frame-grabber in a PC to capture the pair of images this requires. The software on the PC then measures the image co-ordinates of points selected by the user and transforms them into space co-ordinates for the points. The transformation requires knowledge of the relative positions and orientations of the cameras. This is found in a calibration stage from images of a calibration frame. The cameras are mounted on a bar, which guarantees that the relative positions and orientations of the cameras remain invariant within certain limits. This makes the system portable.
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Theissen, Nikolas Alexander. "Physics-based modelling and measurement of advanced manufacturing machinery’s positioning accuracy : Machine tools, industrial manipulators and their positioning accuracy." Licentiate thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263700.
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Advanced manufacturing machinery is a corner stone of essential industries of technologicallydeveloped societies. Their accuracy permits the production of complexproducts according to tight geometric dimensions and tolerances for high efficiency,interchangeability and sustainability. The accuracy of advanced manufacturingmachinery can be quantified by the performance measure of positioning accuracy.Positioning accuracy measures the closeness between a commanded and an attainedposition on a machine tool or industrial manipulator, and it is ruled by lawsof physics in classical mechanics and thermodynamics. These laws can be applied tomodel how much the machinery deflects due to gravity, expands due to a change intemperature and how much and how long it vibrates due to process forces; hence,one can quantify how much the accuracy decreases. Thus, to produce machinerywith ever higher accuracy and precision one can design machines which deflect,expand and vibrate less or one can understand and model the actual behaviour ofthe machinery to compensate for it.This licentiate thesis uses physics-based modelling to quantify the positioningaccuracy of machine tools and industrial robots. The work investigates the potentialincrease in positioning accuracy because of the simultaneous modelling of the kinematics,static deflections, vibrations and thermo-elasticity as a lumped-parametermodel of the machinery. Consequently the models can be used to quantify thechange of the accuracy throughout the workspace.The lumped parameter models presented in this work require empirical modelcalibration and validation. The success of both, calibration and validation, dependson the availability of the right measurement instruments, as these need to be ableto capture the actual positioning accuracy of machinery. This thesis focuses on theimportance of measurement instruments in industry and metrology and creates acatalogue of requirements and trends to identify the features of the measurementinstruments required for the factories of the future. These novel measurement instrumentsshall be able to improve model calibration and validation for an improvedoverall equipment effectiveness, improved product quality, reduced costs, improvedsafety and sustainability as a result of physics-based modelling and measurementof advanced manufacturing machinery.
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Cooper, Clayton Alan. "Milling Tool Condition Monitoring Using Acoustic Signals and Machine Learning." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1575539872711423.
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Sun, Xizhi. "An integrated framework for developing generic modular reconfigurable platforms for micro manufacturing and its implementation." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/3493.
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The continuing trends of miniaturisation, mass customisation, globalisation and wide use of the Internet have great impacts upon manufacturing in the 21st century. Micro manufacturing will play an increasingly important role in bridging the gap between the traditional precision manufacturing and the emerging technologies like MEMS/NEMS. The key requirements for micro manufacturing in this context are hybrid manufacturing capability, modularity, reconfigurability, adaptability and energy/resource efficiency. The existing design approaches tend to have narrow scope and are largely limited to individual manufacturing processes and applications. The above requirements demand a fundamentally new approach to the future applications of micro manufacturing so as to obtain producibility, predictability and productivity covering the full process chains and value chains. A novel generic modular reconfigurable platform (GMRP) is proposed in such a context. The proposed GMRP is able to offer hybrid manufacturing capabilities, modularity, reconfigurablity and adaptivity as both an individual machine tool and a micro manufacturing system, and provides a cost effective solution to high value micro manufacturing in an agile, responsive and mass customisation manner. An integrated framework has been developed to assist the design of GMRPs due to their complexity. The framework incorporates theoretical GMRP model, design support system and extension interfaces. The GMRP model covers various relevant micro manufacturing processes and machine tool elements. The design support system includes a user-friendly interface, a design engine for design process and design evaluation, together with scalable design knowledge base and database. The functionalities of the framework can also be extended through the design support system interface, the GMRP interface and the application interface, i.e. linking to external hardware and/or software modules. The design support system provides a number of tools for the analysis and evaluation of the design solutions. The kinematic simulation of machine tools can be performed using the Virtual Reality toolbox in Matlab. A module has also been developed for the multiscale modelling, simulation and results analysis in Matlab. A number of different cutting parameters can be studied and the machining performance can be subsequently evaluated using this module. The mathematical models for a non-traditional micro manufacturing process, micro EDM, have been developed with the simulation performed using FEA. Various design theories and methodologies have been studied, and the axiomatic design theory has been selected because of its great power and simplicity. It has been applied in the conceptual design of GMRP and its design support system. The implementation of the design support system is carried out using Matlab, Java and XML technologies. The proposed GMRP and framework have been evaluated through case studies and experimental results.
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Zhang, Qiang [Verfasser], Jürgen [Akademischer Betreuer] Pannek, Jürgen [Gutachter] Pannek, and Sergio [Gutachter] Lucia. "Nonlinear Model Predictive Control for Industrial Manufacturing Processes with Reconfigurable Machine Tools / Qiang Zhang ; Gutachter: Jürgen Pannek, Sergio Lucia ; Betreuer: Jürgen Pannek." Bremen : Staats- und Universitätsbibliothek Bremen, 2019. http://d-nb.info/1196286337/34.
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Tlale, Moretlo Celia. "Real-time, open controller for reconfigurable manufacturing systems." Thesis, [Bloemfontein?] : Central University of Technology, Free State, 2013. http://hdl.handle.net/11462/196.
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Thesis (M. Tech. (Information Technology)) -- Central University of technology, Free State, 2013Markets for manufactured products are characterized by a fragmentation of the market (with regards to size and time), and by shorter product cycles. This is due to the occurrence of mass customization and globalization. In mass customization, the same basic products are manufactured for a broad market, but then consumers are given the liberty to choose the “finishing touches” that go with the product. The areas that manufacturers now compete for are higher quality products, low cost and timely response to market changes. Appropriate business strategies and manufacturing technologies must thus be used to implement these strategic dimensions. The paradigm of Reconfigurable Manufacturing System (RMS) has been introduced to respond to this new market oriented manufacturing environment. The design of RMS allows ease of reconfiguration as it has a modular structure in terms of software and hardware. This allows ease of reconfiguration as a strategy to adapt to changing market demands. Modularity will allow the ability to integrate/remove software/hardware modules without affecting the rest of the system. RMS can therefore be quickly reconfigured according to the production requirements of new models, it can be quickly adjusted to exact capacity requirements as the market grows and products change, and it is able to integrate new technology. In this research project, real-time, open controller is designed and developed for Reconfigurable Manufacturing Tools (RMTs). RMTs are the basic building blocks for RMS. Real time and openness of the controllers for RMT would allow firstly, for the modular design of RMTs (so that RMTs can be adapted easily for changing product demands) and secondly, prompt control of RMT for diagnosability.
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Pisipati, Deepak. "Virtual manufacturing of pockets using end milling with multiple tool paths." Ohio : Ohio University, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1177011829.
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Bruzzi, Veronica. "Riconfigurabilità degli impianti produttivi nel settore lamiera: studio ed applicazione al caso Trumpf GmBH." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
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Il presente elaborato è incentrato sull’analisi di riconfigurabilità delle principali tecnologie per la lavorazione della lamiera proposte dall’azienda produttrice tedesca TRUMPF GmbH, ovvero presse piegatrici, taglio laser, punzonatrici e sistemi combinati di punzonatura e laser, al fine di esplicitare gli attributi che caratterizzano i sistemi riconfigurabili, ovvero la modularità, la convertibilità, l’integrabilità, la personalizzazione, la diagnosibilità e la scalabilità, che vengono valutati da un duplice punto di vista, ovvero sia a livello Macro, in termini di automatizzazione degli impianti in fase di progettazione, che a livello Micro, in termini di utensili ausiliari integrabili per svolgere particolari lavorazioni. A seguito di un’analisi qualitativa della riconfigurabilità, vengono proposte formulazioni matematiche al fine di definire quantitativamente gli attributi caratteristici per differenti tipologie di macchine utensili.
Successivamente allo studio di singoli impianti produttivi, la riconfigurabilità viene analizzata da una prospettiva più ampia, espandendosi a sistemi produttivi aziendali riconfigurabili organizzati in celle di lavoro, per cui viene applicato un modello di ottimizzazione della produzione, che mira alla riduzione globale dei tempi produttivi e di attrezzaggio degli impianti, mediante una distribuzione uniforme della produzione, ottenuta tramite un bilanciamento ottimale del carico di lavoro negli impianti produttivi omogenei.
Le teorizzazioni proposte vengono supportate da un caso studio rappresentato da una realtà aziendale dotata di impianti produttivi riconfigurabili TRUMPF, per la quale l’implementazione del modello di ottimizzazione dimostra un considerevole margine di miglioramento, pari a una riduzione del 27,3% dei tempi globali, avvalorando dunque la validità del modello di ottimizzazione e i benefici ottenibili dal suo utilizzo in realtà aziendali altamente tecnologiche e riconfigurabili.
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Oliveira, João Paulo de 1985. "Contribuições ao aprimoramento do processo de abertura de cavidades quadradas com ferramentas rotativas." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265905.
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Orientador: Amauri HassuiDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: Para as indústrias aumentarem a produtividade, se faz necessário buscar melhorias contínuas e muitas vezes radicais em seus processos de fabricação. Uma das maneiras de obter êxito e melhorar os processos existentes é investir em inovação. Diante deste cenário, o presente trabalho visa contribuir para evolução do processo de obtenção do furo quadrado em máquina CNC. O processo para obtenção de furo quadrado em máquina CNC é recente, porém limitado, atualmente é possível produzir furos quadrados com cantos arredondados e apenas com ferramenta de medida igual à medida do furo que se quer produzir. Os testes feitos com uma nova modelagem matemática, mostraram ser possível obter mais pontos de programação e consequentemente obter uma melhor geometria do furo, com cantos afiados, e também aumentar a flexibilidade do processo, já que com uma ferramenta é possível fazer vários furos de medidas distintas à medida da ferramenta. Através dos experimentos, também foi possível mostrar uma aplicação prática do processo, tornando-o ainda mais vantajoso e produtivo
Abstract: For industries to increase productivity it is necessary to keep seeking for improvements and often radical improvements in their manufacturing processes. One of the ways to succeed and improve the existing processes it is to invest in innovation. In this scenario, the present work aims to contribute to the evolution of obtaining the square hole in CNC machine process. The process for obtaining the square hole CNC machine new, but limited. Currently it is possible to produce square holes with rounded corners and with only the same extent as the hole tool which it is willing to produce. The tests made with a new mathematical modeling showed that it is possible to obtain more points programming therefore get a better geometry of the hole with sharp corners also increase the flexibility of the process, as with a tool it is possible to make several holes measures as distinct from the tool. Through the experiments it was also possible to show a practical application of the process, making it even more beneficial and productive
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
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Pratt, Jon Robert Jr. "Vibration Control for Chatter Suppression with Application to Boring Bars." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29344.
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A mechatronic system of actuators, sensors, and analog circuits is demonstrated to control the self-excited oscillations known as chatter that occur when single-point turning a rigid workpiece with a flexible tool. The nature of this manufacturing process, its complex geometry, harsh operating environment, and poorly understood physics, present considerable challenges to the control system designer. The actuators and sensors must be rugged and of exceptionally high bandwidth and the control must be robust in the presence of unmodeled dynamics. In this regard, the qualitative characterization of the chatter instability itself becomes important. Chatter vibrations are finite and recognized as limit cycles, yet modeling and control efforts have routinely focused only on the linearized problem. The question naturally arises as to whether the nonlinear stability is characterized by a jump phenomenon. If so, what does this imply for the "robustness" of linear control solutions?
To answer our question, we present an advanced hardware and control system design for a boring bar application. Initially, we treat the cutting forces merely as an unknown disturbance to the structure which is essentially a cantilevered beam. We then approximate the structure as a linear single-degree-of-freedom damped oscillator in each of the two principal modal coordinates and seek a control strategy that reduces the system response to general disturbances. Modal-based control strategies originally developed for the control of large flexible space structures are employed; they use second-order compensators to enhance selectively the damping of the modes identified for control.
To attack the problem of the nonlinear stability, we seek a model that captures some of the behavior observed in experiments. We design this model based on observations and intuition because theoretical expressions for the complex dynamic forces generated during cutting are lacking. We begin by assuming a regenerative chatter mechanism, as is common practice, and presume that it has a nonlinear form, which is approximated using a cubic polynomial. Experiments demonstrate that the cutting forces couple the two principal modal coordinates. To obtain the jump phenomena observed experimentally, we find it necessary to account for structural nonlinearies. Gradually, using experimental observation as a guide, we arrive at a two-degree-of-freedom chatter model for the boring process. We analyze the stability of this model using the modern methods of nonlinear dynamics.
We apply the method of multiple scales to determine the local nonlinear normal form of the bifurcation from static to dynamic cutting. We then find the subsequent periodic motions by employing the method of harmonic balance. The stability of these periodic motions is analysed using Floquet theory.
Working from a model that captures the essential nonlinear behavior, we develop a new post-bifurcation control strategy based on quench control. We observe that nonlinear state feedback can be used to control the amplitude of post-bifurcation limit cycles. Judicious selection of this nonlinear state feedback makes a supplementary open-loop control strategy possible. By injecting a harmonic force with a frequency incommensurate with the chatter frequency, we find that the self-excited chatter can be exchanged for a forced vibratory response, thereby reducing tool motions.Ph. D.
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Bulut, Aykut. "Order Driven Flexible Shop Management." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613395/index.pdf.
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The difficulties in responding to variation in product order mixes and load levels effectively in make to order are known. Most of the existing approaches consider releasing jobs to the shop (input control), changing capacity levels (output control) in a controlled way, order acceptance with different definitions of work load and due date assignment. Controlling the processes, routing options and the order accepting capacity with various tool combinations that will decrease tool loading are not considered
properly.
However the manufacturing flexibility provided by the computer numerically controlled (CNC) machines, provides both part variety and due date achievement given a reasonable extra capacity. Positive effects of flexibility on the due date achievement of the make to order is shown with a variety of experimental and field studies leaving little doubt. However taking flexibility only as a strategic issue and not considering it as a means of planning and management in either the short term or medium term decisions have been commonplace practice.
In this study, benefits of providing three kinds of flexibility, considering order pool and acceptance probability of the new arrivals in a periodic setting, is the focal issue. If the required flexible environment is provided, the necessity to make a detailed job loading, route planning and scheduling will be reduced to a low level and a high shop congestion and due date achievement will be realized simultaneously. A typical realistic shop with a scaled part mix is assumed in the flexibility management modeling and simulation experiments are conducted applying periodical flexibility planning approach. These experiments briefly support the ideas that worth of anticipation is more than plain expectations and flexibility improves robustness.
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Hampl, Petr. "Návrh technologie součásti "kryt vstřikovače" v podmínkách malé strojírenské firmy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230365.
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Processing completely producting technological documentation for production part “INJECTOR COVER” for firm BM SERVICE (formerly ČKD Hradec Králové), including time schedule production of parts (parts which past welding and machining create demanded component part) and calculation production costs. Solving production process is concepted in two variation (actual and forecast study) for machines which are sorted from existing machinery and from now proposed machines. Estimation is designed for firm conditions introducing to the production with view for qualifications of workers, convention in firm and equipment.
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Skládaný, Jakub. "Volba řezných nástrojů, podmínek a obráběcího stroje pro soustružení cívek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241670.
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The purpose of work is to provide a manufacturing processes, cutting and machine tools for machining of small parts. The proposals are designed for high volume production with a maximum productivity. The first half is largely nature of the search, which analyzes issue of tools and machines for production of rotary parts. Further proposals are developed manufacturing processes for different types of machines including multi-spindle lathes. The main result of this work is to determine appropriate type of machine for the production of specified parts.
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Hatipoglu, Demiralp. "A Feature Based Design Software For Parts To Be Machined In A Four-axis Cnc Lathe." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606512/index.pdf.
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A previously developed feature library and algorithm are improved in order to develop a software capable of designing of parts to be manufactured using a four-axis CNC lathe. The developed program is composed of sections which arepart geometry design, process planning, cutting tool and machining parameter selection, part program generation and G-code simulation for verification. The developed program is capable of designing parts which contain axisymetric features for turning and related operations, and non-axisymetric features for milling on facial, lateral and cylindrical surfaces. Implemented design procedure defines a blank material shape that can be circular or polygonal cross-sectioned bar or a pre-manufactured part. A detailed database is created for proper cutting tool selection and machining data determination. User can either define or let the program to automatically select the cutting parameters like cutting speed, feed rate and depth of cut for each cutting tool with respect to the workpiece material being machined. After completing design and process planning procedures
information for generation of the CNC program becomes readily available for editing or transferring to the CNC machine tool. User can also simulate the NC program to verify the tool path. User friendly interface, which runs on Autodesk'
s INVENTOR software to visualize the design process, allows design and modifications to be done very easily moreover previously designed parts can be redesigned to produce new modified parts.
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Uhlmann, Eckart, Jörg Reiff-Stephan, Bernd Duchstein, and Jan Mewis. "Technical Design Packaging im Werkzeugmaschinenbau durch Effizienz und Effektivität in der Produktentwicklung." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232983.
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Der beschleunigte Wandel der Industriegesellschaft wird auch in den nächsten Jahrzehnten entscheidend durch technologische Innovationsprozesse beeinflusst. In diesem Bereich sind die deutschen Werkzeugmaschinenhersteller führend, was anhand der vorgestellten Innovationen zu erkennen ist. Die deutschen Hersteller haben sich als Technologieführer mit geringeren Stückzahlen positioniert während die asiatischen Hersteller vorrangig im Segment der Universalmaschinen als Massenhersteller vertreten sind. Langfristig wird es darauf ankommen, ob die einzelnen Unternehmen zu strategischen Phasensprüngen fähig sind, die angesichts der Globalisierung der Wirtschaftsstruktur zu einer wettbewerbsfähigen Technologiekultur führen. Im Hinblick auf diese Anforderungen ist insbesondere die Beschleunigung der Entwicklungsprozesse eine wesentliche Voraussetzung für die Beibehaltung und den Ausbau der Marktposition der global agierenden Unternehmen. [... aus der Einleitung]
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Uhlmann, Eckart, Jörg Reiff-Stephan, Bernd Duchstein, and Jan Mewis. "Technical Design Packaging im Werkzeugmaschinenbau durch Effizienz und Effektivität in der Produktentwicklung." TUDpress - Verlag der Wissenschaften GmbH, 2012. https://tud.qucosa.de/id/qucosa%3A30789.
Full textAbstract:
Der beschleunigte Wandel der Industriegesellschaft wird auch in den nächsten Jahrzehnten entscheidend durch technologische Innovationsprozesse beeinflusst. In diesem Bereich sind die deutschen Werkzeugmaschinenhersteller führend, was anhand der vorgestellten Innovationen zu erkennen ist. Die deutschen Hersteller haben sich als Technologieführer mit geringeren Stückzahlen positioniert während die asiatischen Hersteller vorrangig im Segment der Universalmaschinen als Massenhersteller vertreten sind. Langfristig wird es darauf ankommen, ob die einzelnen Unternehmen zu strategischen Phasensprüngen fähig sind, die angesichts der Globalisierung der Wirtschaftsstruktur zu einer wettbewerbsfähigen Technologiekultur führen. Im Hinblick auf diese Anforderungen ist insbesondere die Beschleunigung der Entwicklungsprozesse eine wesentliche Voraussetzung für die Beibehaltung und den Ausbau der Marktposition der global agierenden Unternehmen. [... aus der Einleitung]
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Asato, Osvaldo Luís. "CNCs de arquitetura aberta na manufatura: análise e síntese." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-11072018-161822/.
Full textAbstract:
Este trabalho apresenta uma Análise sobre os Comandos Numéricos Computadorizados de Arquitetura Aberta aplicado na automação de Máquina-ferramentas e no uso da manufatura. É realizado uma classificação das Arquiteturas Abertas (em relação ao hardware, software, funcionalidade e flexibilidade) e uma comparação entre os CNC\'s convencionais e os CNC\'s de Arquitetura Aberta.This work presents an Open Architecture CNCs analysis. An Open Architecture classification using hardware, software, functionality and flexibility are presented. A comparison table with conventional CNCs and this new class of CNCs are elaborated.
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Таран, В. Ю. "Підвищення ефективності процесів механічної обробки тіл обертання." Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/72520.
Full textAbstract:
Інтенсифікація механічної обробки деталей типу вал з використанням можливостей сучасного металорізального обладнання є перспективним напрямком досліджень, адже направлена на зменшення частки допоміжного часу та використанні гнучких верстатних пристроїв (ВП).
Метою цієї роботи є підвищення ефективності механічної обробки деталей типу вал за рахунок інтенсифікації технологічного процесу (ТП) та впровадження гнучких ВП, здатних забезпечити багатокоординатну обробку.
Об’єкт дослідження: технологічний процес механічної обробки деталей типу вал.
Предмет дослідження: фрезерна операція технологічного процесу механічної обробки деталей типу вал.
Практичне значення одержаних результатів відображене у тому, що розроблено конструкцію ВП, який дозволяє реалізувати багатокоординатну обробку деталей типу вал та підготовлена конструкторсько-технологічна документація для виготовлення ВП, що може бути впроваджена на підприємствах, які виконують обробку деталей даного типу.
Наукова новизна: вперше розроблена класифікація деталей типу вал за конструкторсько-технологічними параметрами; доведено можливість інтенсифікації механічної обробки деталей типу вал і працездатність запропонованої конструкції ВП, яка забезпечує високий ступінь гнучкості, необхідну жорсткість системи «ВП – заготовка» та дозволяє отримати точність обробки, задану конструктором.Интенсификация механической обработки деталей типа вал с использованием возможностей современного металлорежущего оборудования является перспективным направлением исследований, так как направлена на уменьшение доли вспомогательного времени и использование гибких станочных приспособлений (СП). Целью этой работы является повышение эффективности механической обработки деталей типа вал за счет интенсификации технологического процесса и внедрение гибких СП, способных обеспечить многокоординатную обработку. Объект исследования: технологический процесс механической обработки деталей типа вал. Предмет исследования: фрезерная операция технологического процесса механической обработки деталей типа вал. Практическое значение полученных результатов отражено в том, что разработана конструкция СП, которое позволяет реализовать многокоординатную обработку деталей типа вал, и конструкторско-технологическая документация для его изготовления, что может быть внедрена на предприятиях. Научная новизна: впервые разработана классификация деталей типа вал по конструкторско-технологическим параметрам; доказана возможность интенсификации механической обработки деталей типа вал и работоспособность предложенной конструкции СП, которое обеспечивает высокую степень гибкости, необходимую жесткость системы «СП - заготовка» и позволяет получить точность обработки, заданную конструктором.
Intensification of machining of shaft-type parts using the capabilities of modern metal-cutting equipment is a promising area of research, as it is aimed at reducing the proportion of auxiliary time and using flexible machine tools (SP). The purpose of this work is to increase the efficiency of machining of shaft-type parts due to the intensification of the technological process and the introduction of flexible joint ventures capable of providing multi-coordinate processing. The object of study: the technological process of machining of shaft-type parts. Subject of research: the milling operation of the technological process of machining parts like shaft. The practical significance of the results obtained is reflected in the fact that the design of the joint venture has been developed, which allows the implementation of multi-axis machining of shaft-type parts, and the design and technological documentation for its manufacture, which can be implemented in enterprises. Scientific novelty: for the first time, the classification of shaft-type parts according to design-technological parameters was developed; The possibility of intensifying the machining of shaft-type parts and the efficiency of the proposed design of the joint venture, which provides a high degree of flexibility, the necessary rigidity of the “SP-workpiece” system and allows obtaining the machining accuracy specified by the designer, is proved.
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Yamada, Yoshio. "Melhoria da produtividade na obtenção de furos em liga de aluminio aeronautico com ferramentas de aço rapido." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263043.
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Orientador: Nivaldo Lemos CoppiniDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: O objetivo deste trabalho consiste em aperfeiçoar o processo de fabricação de furos realizados pela empresa X em um de seus produtos. Além da otimização deverá ser mantida a qualidade dimensional através do controle do diâmetro, da cilindricidade, da circularidade e do acabamento superficial de furos cilíndricos obtidos pelo processo de alargamento, com ferramentas de aço rápido em de liga de alumínio Al 7175 T66, para se obter furos com alta qualidade superficial e precisão de forma, que atendam as especificações de projeto de componentes da indústria aeronáutica. É estudada a influência das variáveis do processo: velocidade de corte, avanço, sobre as variáveis de resposta: força de avanço e momento torsor. O processo de alargamento estudado é realizado em 04 operações sendo 02 operações de furação e 02 operações de alargamento com ferramentas de aço rápido, na primeira etapa os ensaios foram realizados com os parâmetros de usinagem do processo produtivo para caracterizar o processo, na segunda etapa foi implementada uma elevação dos parâmetros de usinagem com uma redução do tempo de produção. Na terceira etapa os ensaios foram realizados para avaliar a influência do pré-furo e do pré-alargamento na qualidade final, acarretando em uma maior redução do tempo de processo comparado com o processo otimizado. Pretende-se obter tal furo com a realização de apenas uma etapa de furação e uma de alargamento. Para isso, é necessária a observação não só da qualidade das peças em relação aos requisitos exigidos pelos clientes, mas também do tempo de ciclo de produção. As condições otimizadas e resultantes foram: velocidade de corte 100 m/min., avanço 0,2 mm/rot., com operação de pré-furação e sem operação de pré-alargamento. Com estas condições reduziu-se o tempo de produção por peça de 1,42 min. para 0,63 min
Abstract: The purpose of this study is to optimize the manufacturing process of holes made by Company X in one of their products. Besides the optimization, should be maintained the dimensional quality by controlling the diameter, roundness, circularity, and surface finish of cylindrical holes obtained by the widening process, with high-speed steel reamers in a aluminum alloy 7175-T66, to obtain holes with high surface quality and precision of form that meet the design specifications of aviation industry components. It is studied the influence of process variables: cutting speed, feed, about the response variables: feed force and torsion moment. The widening process studied is realized in four operations, consisting of two drilling operations and two widening operations with high-speed steel tools. In the first stage, the tests were carried out with machining parameters of the company to characterize the process. In the second stage, was implemented an increase in machining parameters with a reduction in the production time. In the third stage, the tests were realized to evaluate the influence of pre-drilling and pre-widening on the final quality, resulting in a further reduction of processing time compared with the optimized process. We intend to obtain this hole with the realization of only one drilling stage and one widening stage. For this, it's necessary not only the observation of the quality of the pieces in relation to the requirements demanded by the customers, but also the cycle time of production. The optimized conditions and resulting were: cutting speed of 100 m/min., feed of 0.2 mm/rev, with pre-drilling operation and without pre-widening operation. With this conditions, reduced the production time per piece of 1.42 min. to 0.63 min
Mestrado
Engenharia de Fabricação
Mestre em Engenharia Mecânica
39
Fenollosa, Artés Felip. "Contribució a l'estudi de la impressió 3D per a la fabricació de models per facilitar l'assaig d'operacions quirúrgiques de tumors." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667421.
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La present tesi doctoral s’ha centrat en el repte d’aconseguir, mitjançant Fabricació Additiva (FA), models per a assaig quirúrgic, sota la premissa que els equips per fer-los haurien de ser accessibles a l’àmbit hospitalari. L’objectiu és facilitar l’extensió de l’ús dels prototips com a eina de preparació d’operacions quirúrgiques, transformant la pràctica mèdica actual de la mateixa manera que en el seu moment ho van fer tecnologies com les que van facilitar l’ús de radiografies. El motiu d’utilitzar FA, en lloc de tecnologies més tradicionals, és la seva capacitat de materialitzar de forma directa les dades digitals obtingudes de l’anatomia del pacient mitjançant sistemes d’escanejat tridimensional, fent possible l’obtenció de models personalitzats. Els resultats es centren en la generació de nou coneixement sobre com aconseguir equipaments d’impressió 3D multimaterials accessibles que permetin l’obtenció de models mimètics respecte als teixits vius. Per facilitar aquesta buscada extensió de la tecnologia, s’ha focalitzat en les tecnologies de codi obert com la Fabricació per Filament Fos (FFF) i similars basades en líquids catalitzables. La recerca s’alinea dins l’activitat de desenvolupament de la FA al CIM UPC, i en aquest àmbit concret amb la col·laboració amb l’Hospital Sant Joan de Déu de Barcelona (HSJD). El primer bloc de la tesi inclou la descripció de l’estat de l’art, detallant les tecnologies existents i la seva aplicació a l’entorn mèdic. S’han establert per primer cop unes bases de caracterització dels teixits vius -sobretot tous- per donar suport a la selecció de materials que els puguin mimetitzar en un procés de FA, a efectes de millorar l’experiència d’assaig dels cirurgians. El caràcter rígid dels materials majoritàriament usats en impressió 3D els fa poc útils per simular tumors i altres referències anatòmiques. De forma successiva, es tracten paràmetres com la densitat, la viscoelasticitat, la caracterització dels materials tous a la indústria, l’estudi del mòdul elàstic de teixits tous i vasos, la duresa d’aquests, i requeriments com l’esterilització dels models. El segon bloc comença explorant la impressió 3D mitjançant FFF. Es classifiquen les variants del procés des del punt de vista de la multimaterialitat, essencial per fer models d’assaig quirúrgic, diferenciant entre solucions multibroquet i de barreja al capçal. S’ha inclòs l’estudi de materials (filaments i líquids) que serien més útils per mimetitzar teixits tous. Es constata com en els líquids, en comparació amb els filaments, la complexitat del treball en processos de FA és més elevada, i es determinen formes d’imprimir materials molt tous. Per acabar, s’exposen sis casos reals de col·laboració amb l’HJSD, una selecció d’aquells en els que el doctorand ha intervingut en els darrers anys. L’origen es troba en la dificultat de l’abordatge d’operacions de resecció de tumors infantils com el neuroblastoma, i a la iniciativa del Dr. Lucas Krauel. Finalment, el Bloc 3 té per objecte explorar nombrosos conceptes (fins a 8), activitat completada al llarg dels darrers cinc anys amb el suport dels mitjans del CIM UPC i de l’activitat associada a treballs finals d’estudis d’estudiants de la UPC, arribant-se a materialitzar equipaments experimentals per validar-los. La recerca ampla i sistemàtica al respecte fa que s’estigui més a prop de disposar d’una solució d’impressió 3D multimaterial de sobretaula. Es determina que la millor via de progrés és la de disposar d’una pluralitat de capçals independents a fi de capacitar la impressora 3D per integrar diversos conceptes estudiats, materialitzant-se una possible solució. Cloent la tesi, es planteja com seria un equipament d’impressió 3D per a models d’assaig quirúrgic, a fi de servir de base per a futurs desenvolupaments.La presente tesis doctoral se ha centrado en el reto de conseguir, mediante Fabricación Aditiva (FA), modelos para ensayo quirúrgico, bajo la premisa que los equipos para obtenerlos tendrían que ser accesibles al ámbito hospitalario. El objetivo es facilitar la extensión del uso de modelos como herramienta de preparación de operaciones quirúrgicas, transformando la práctica médica actual de la misma manera que, en su momento, lo hicieron tecnologías como las que facilitaron el uso de radiografías. El motivo de utilizar FA, en lugar de tecnologías más tradicionales, es su capacidad de materializar de forma directa los datos digitales obtenidos de la anatomía del paciente mediante sistemas de escaneado tridimensional, haciendo posible la obtención de modelos personalizados. Los resultados se centran en la generación de nuevo conocimiento para conseguir equipamientos de impresión 3D multimateriales accesibles que permitan la obtención de modelos miméticos respecto a los tejidos vivos. Para facilitar la buscada extensión de la tecnología, se ha focalizado en las tecnologías de código abierto como la Fabricación por Hilo Fundido (FFF) y similares basadas en líquidos catalizables. Esta investigación se alinea dentro de la actividad de desarrollo de la FA en el CIM UPC, y en este ámbito concreto con la colaboración con el Hospital Sant Joan de Déu de Barcelona (HSJD). El primer bloque de la tesis incluye la descripción del estado del arte, detallando las tecnologías existentes y su aplicación al entorno médico. Se han establecido por primera vez unas bases de caracterización de los tejidos vivos – principalmente blandos – para dar apoyo a la selección de materiales que los puedan mimetizar en un proceso de FA, a efectos de mejorar la experiencia de ensayo de los cirujanos. El carácter rígido de los materiales mayoritariamente usados en impresión 3D los hace poco útiles para simular tumores y otras referencias anatómicas. De forma sucesiva, se tratan parámetros como la densidad, la viscoelasticidad, la caracterización de materiales blandos en la industria, el estudio del módulo elástico de tejidos blandos y vasos, la dureza de los mismos, y requerimientos como la esterilización de los modelos. El segundo bloque empieza explorando la impresión 3D mediante FFF. Se clasifican las variantes del proceso desde el punto de vista de la multimaterialidad, esencial para hacer modelos de ensayo quirúrgico, diferenciando entre soluciones multiboquilla y de mezcla en el cabezal. Se ha incluido el estudio de materiales (filamentos y líquidos) que serían más útiles para mimetizar tejidos blandos. Se constata como en los líquidos, en comparación con los filamentos, la complejidad del trabajo en procesos de FA es más elevada, y se determinan formas de imprimir materiales muy blandos. Para acabar, se exponen seis casos reales de colaboración con el HJSD, una selección de aquellos en los que el doctorando ha intervenido en los últimos años. El origen se encuentra en la dificultad del abordaje de operaciones de resección de tumores infantiles como el neuroblastoma, y en la iniciativa del Dr. Lucas Krauel. Finalmente, el Bloque 3 desarrolla numerosos conceptos (hasta 8), actividad completada a lo largo de los últimos cinco años con el apoyo de los medios del CIM UPC y de la actividad asociada a trabajos finales de estudios de estudiantes de la UPC, llegándose a materializar equipamientos experimentales para validarlos. La investigación amplia y sistemática al respecto hace que se esté más cerca de disponer de una solución de impresión 3D multimaterial de sobremesa. Se determina que la mejor vía de progreso es la de disponer de una pluralidad de cabezales independientes, a fin de capacitar la impresora 3D para integrar diversos conceptos estudiados, materializándose una posible solución. Para cerrar la tesis, se plantea cómo sería un equipamiento de impresión 3D para modelos de ensayo quirúrgico, a fin de servir de base para futuros desarrollos.
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Collins, James. "Automatic calibration of a tool-changing unit for modular reconfigurable machines." Thesis, 2011. http://hdl.handle.net/10413/8859.
Full textAbstract:
Modern trends in customer demand have resulted in the development of a class of
manufacturing system known as Reconfigurable Manufacturing Systems (RMS).
Reconfigurable systems are designed around the idea that they must be able to be
reconfigured in both their production capacity as well as in the machining processes they
perform. A subset of the RMS paradigm is a group of machines called Modular
Reconfigurable Machines (MRMs). Modular machines are built up from different hardware
modules. They offer the user the possibility of only purchasing the required tooling for the
specific need at the time. As reconfigurable machines are able to offer flexibility in
machining functions, their ability to have easy access to a variety of machine tools would
greatly influence their effectiveness and production capacity. This project presents a
machine tooling system that would provide MRMs with an efficient way to change tools.
A major requirement of the unit was that it should automatically calibrate itself in terms
of its position relative to the machine it was servicing. In order for the unit to realize this
requirement, it needed a method that would provide it with real-time 3D tracking of the
spindle with which it was interacting. Commercially available systems that offer this
facility are very costly. A popular gaming controller, the Nintendo Wii remote, was used to
provide the tool-changing unit with a very economical real-time 3D tracking capability.
This dissertation details the design, implementation and testing of the positioning system
for the tool-changing unit.Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2011.
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Neto, Acendino Alves da Silva. "Technological evolution in machining processes with CNC machines in the context of the concept of Industry 4.0." Master's thesis, 2018. http://hdl.handle.net/1822/57285.
Full textAbstract:
Dissertação de mestrado em Industrial EngineeringThe work related to the project of this dissertation will consist of an analysis of the technological evolution of the machining processes with CNC (Computer Numerical Control) machines regarding the new concept of Industry 4.0. The concept fits into the current transformation process for the fourth industrial revolution, such as integrated Cyber-Physical Systems (CPS) within the manufacturing processes using the Internet of Things (IoT) in industrial processes. Faced with technological advances, the processes of Industrial Engineering in machining using CNC machines must undergo adaptations, aiming at substantial increases in the operational effectiveness. Thus, an approach will be made to understand how current processes can adapt to the concept under study when analyzing the evolution of the machining tools for CNC machines in the face of new processes. A thorough study will be done to adapt the methodology of Industry 4.0 applying it to the machining processes in CNC Machines. Thereby, a proposal for future applications will be given on the topics studied. The methodology will be based entirely on a documental analysis research strategy. The virtual technology in machining tools is still a subject in development, being one of the main factors to be understood in this dissertation. In this study, it will be possible to analyze the main factors that can influence directly or indirectly the production processes of a factory with CNC machines. It will be explored and studied the types of machining processes for CNC machines and the types of machining tools developed with virtual technology. When we are talking about virtual technology, we are usually addressing the need for software. In CNC machining operations, there is a CAM (Computer Aided Manufacturing) software that performs machining simulations for CNC machines. Thus, a study and analysis of a production system involving a CAM software, a tool with virtual technology and CNC machines will be done to verify how this set can work encompassed and what changes this production model introduces. In the sequence of this study, an idea of a new production system will be proposed, allowing for a better understanding of the possibilities for application of new approaches in the future.
O trabalho relacionado ao projeto desta dissertação de mestrado consistirá de uma análise da evolução tecnológica dos processos de usinagem com as máquinas CNC (Comando Numérico Computacional) em relação ao novo conceito da Indústria 4.0. O conceito se enquadra no atual processo de transformação da quarta revolução industrial, com os Sistemas Ciber-Físicos integrados (CPS) dentro dos processos de fabricação que utilizam a Internet das Coisas (IoT) em processos industriais. Diante dos avanços tecnológicos, os processos de Engenharia Industrial em usinagem utilizando máquinas CNC devem sofrer adaptações, visando um aumento substancial na eficácia operacional. Assim, uma abordagem será feita para entender como os processos atuais podem se adaptar ao conceito em estudo, visando também uma análise da evolução das ferramentas de usinagem para máquinas CNC em face de novos processos. Um estudo minucioso será feito para adaptar a metodologia da Indústria 4.0, aplicando-a aos processos de usinagem em máquinas CNC. Com isso, algumas proposta para aplicações futuras serão apresentadas para os tópicos estudados. A metodologia será totalmente baseada em uma estratégia de investigação documental. A tecnologia virtual em ferramentas de usinagem ainda é um assunto em desenvolvimento, sendo um dos principais fatores a serem compreendidos na realização deste trabalho. Neste estudo, será possível analisar os principais fatores que podem influenciar direta ou indiretamente nos processos de produção de uma fábrica com máquinas CNC. Serão explorados e estudados os tipos de processos de usinagem para máquinas CNC e os tipos de ferramentas de usinagem desenvolvidas com tecnologia virtual. Quando abordamos o assunto sobre tecnologia virtual, geralmente estamos a lidar com a necessidade de um software. Nas operações de usinagem CNC, existe um software CAM (Manufatura Assistida por Computador) que realiza simulações de usinagem para máquinas CNC. Assim, um estudo e análise do sistema de produção envolvendo um software CAM, uma ferramenta com tecnologia virtual e máquinas CNC será feito para verificar como este conjunto pode trabalhar englobado e quais as mudanças para esse modelo de produção. Na sequência dessa análise, será proposta uma ideia de um novo sistema de produção, que permite uma melhor compreensão das possibilidades de aplicação no futuro das novas abordagens.
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Cheng, Yu-Hsun, and 鄭宇珣. "Additive Manufacturing of PC_Based Five Axis Machine Tools." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/u24b9g.
Full textAbstract:
碩士國立清華大學
動力機械工程學系
105
The purpose of this project is to design a faster and more precise control system for the 3D printer designed in the "High Speed Flexible 3D Freedom Technique" program.This project is the sub-project of the “High Speed Flexible 3D Freeform Technique” program of the Ministry of Science and Technology. Some characteristics of "High Speed Flexible 3D Freedom Technique" include dispensing ribbon-shaped materials and forming these materials along the trajectory tangent to create manufacturing parts. In Chang's thesis " High Speed Flexible 3D Freeform Technique: Material Dispensing System and Process Development for Thermoplastics ", this method is known to improve the dispensing speed and the superficial flatness of the product.
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Min-HsuanHsieh and 謝旻軒. "Development of an Advanced Manufacturing Cloud for Machine Tools." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/86736932403722165418.
Full textAbstract:
碩士國立成功大學
製造資訊與系統研究所碩博士班
101
Cloud manufacturing refers to encapsulating distributed manufacturing resources into cloud services to support manufacturing activities. Compared to direct usage of cloud computing resources, cloud manufacturing is a more advanced application of cloud computing. In this thesis, a cloud manufacturing platform, called AMC (Advanced Manufacturing Cloud), is developed. The AMC provides several manufacturing-related cloud services which can facilitate the users to conduct intelligent activities for machine tools, such as collecting and uploading machining data of machine tools to the cloud, creating prediction models in the cloud, downloading prediction models from the cloud to factories for performing prediction applications, recommending suitable machine tools or cutting tools by cloud services, and providing virtual machine tool functions via cloud services. This thesis presents the architecture design of the AMC first. Then, the design and implementation of the AMC’s core functions are described. To create a prototype of the AMC, the cloud services are deployed on the Windows Azure public cloud platform. Finally, the AMC is applied to the machine tools provided by a cooperative company so as to conduct integrated tests and performance evaluation. Testing results validate the effectiveness of the AMC in facilitating the intelligence of machine tools.
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Xu, Zhengyi. "Modular architecture design of reconfigurable machine tools for agile manufacturing /." 2006. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=442639&T=F.
Full text
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Wu, Chong-Wei, and 巫崇瑋. "Study of Reconfigurable Machine Tool-Design and Manufacturing." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/42912284441423061504.
Full textAbstract:
碩士大葉大學
機械與自動化工程學系
101
The demand for efficiency and precession of CNC grows with advancing technology. From 3-axis to 4 or 5-axis machines are built to meet industrial demands, so does the number of studies and literatures regarding reconfigurable machine tools. The application of configurable units is between dedicated units and multifunctional CNCs. Dedicated units are selected for pieces to be machine for single products of mass production. If the pieces are in small quantity and large variety, highly priced multifunctional CNCs are a good choice. For other types of machining, the configurable machine tools may be considered. They have the potential of development and worth in-depth investigation and study in this regard. This paper is intended to focus on the development of reconfigurable modules of machine tool. First the modular categories of machine tool parts and components are established based on functions, kinetics and assembly needs. Then, introduction is given on how to separate the unit into primary and secondary modules from the point of view of direction from which the flow of force is directed, and unfit modules are eliminated from a selection of modules. Modules that meet the criteria are identified using this series of selection steps, and finally a limitation equation is brought in to identify machine tool modules that fit the cost function the most. By employing this sequence, designers will be able to come up with the best-fit module combination from a module library based on various needs, thus eliminating the need to redesign and redevelop a unit of the same specifications. It requires the replacement of necessary modules to modify the entire unit and no need for redesign, saving both time and cost. A modular method was introduced to simulate the establishment of a configurable unit. Preliminary structure design was performed after confirmation of specifications. Calculations were made to determine suitable key components, such as threaded rods and linear guideways, that meet precision requirements. For the selection of machining process, suppliers are sought out to satisfy the demands for costs and delivery deadlines. Parts and components to be machined are scrutinized for tolerance based on design drawings. After measurement, parts and components are placed in warehouse by categories. Standard assembly procedures and machine checklists are established to facilitate the assembly based on standard procedures and ensure the errors accumulated from allowable tolerance within control. The unit is energized and laser interferometer is used for positioning compensation. Circular tester is used for roundness test in order to meet the requirement of co-action interpolation error. Finally D-H modified notation is introduced for coordinate conversion program. CC path is converted to CL path to produce NC Code of machining. NC Code is imported into the control for machining and the precision of finished products is measured to make sure that the requirements of dimension in the design are met.
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Chen, Chu-Wen, and 陳諸文. "A Study of Manufacturing Servitizationin Machine Tool Industry." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/33133701011011619116.
Full textAbstract:
碩士國立暨南國際大學
管理學院經營管理碩士學位學程碩士在職專班
101
Machine tool is one of the important industries in Taiwan. Taiwan now is the 4th biggest machine tool export worldwide. Due to lack of core technology, Taiwan machine tool manufacturers are struggling to expand market share in the high-end segment which is occupied by the competitors from developed countries. Servitization is one of the strategies for manufacturers in developed countries to compete with low cost product competition from emerging countries. Machine tool manufacturers in developed countries have been providing intangible services with selling tangible products to sustain their leading position in the market. Taiwan machine tool manufacturers have been adding more services on their product to strengthen its competitiveness. The aim of this thesis is to develop a method to identify machine tool manufacturer’s progress in manufacturing servitization.
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Fu, Chien-Yu, and 傅建瑜. "A Study of Manufacturing Servitization in Machine Tool Industry." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/45121064604461509213.
Full textAbstract:
碩士國立暨南國際大學
管理學院經營管理碩士學位學程碩士在職專班
102
Taiwan's machine tool industry has been in the 1980 's. It has gradually shifted from labor-intensive and capital -intensive technology gradually industries . In recent years, Taiwan's machine tool industry is one of the important industries , Taiwan's machine tool exports has become the fourth country in the world . The components of Taiwan's machine tool industry have already been some level , but has been unable to break in the high-end market situation in the German and Japanese manufacturers and China has the advantage of low-cost industry and national resources and runs after it. In additional, Taiwan machine tools has broken through the skills, and the business model must be increase the new method. To get rid of a rising star in the national machine tool , manufacturing, service-oriented will become an important strategic , via services tangible and intangible products to add value , so that the products have different differences with competitors . In recent years, Taiwan's large-scale machine tool manufacturing industry which has a tendency to start a service , but with the Japanese , German manufacturers still have a large section of the distance , this study focused on SMEs factory operated by manufacturing services of tools , to improve the so-called traditional industries upgrade work Machine tools .
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Li, Yu-Ming, and 李育民. "Drum-Buffer-Rope Scheduling Application in Machine Tool Manufacturing System." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/80848451668286734634.
Full textAbstract:
碩士朝陽大學
工業工程與管理研究所
87
The Supply-Chain and Quick Response Systems are being discussed enthusiastically all over the world recently. When a factory applied the Quick Response Systems, three main questions must be considered：the time to marketing , the time to product, and the availability to promise. This research is major on the availability to promise, and hope to develop a simple scheduling method that can solve the orders production sequence. This research will discuss the flow shop model in the plant scheduling, which includes three processes and two work stations. The first station deals with process 1 and 3, and the second station deals with process 2. Such process causes a work backflow problem. At first, the work priority is decided by the traditional one-machine dispatching rules, Apparent Tardiness Cost (ATC) rule. Then Drum-Buffer-Rope(DBR) is used to gain a fast and fesible order sequence. The performance criterion focuses on the minimization of total tardiness and production flow time. Then a machine tool factory data to get the numerical result in order to show that the scheduling method is effective.
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Lin, Chin-Yu, and 林錦玉. "The Business Strategies of Machine Tool Manufacturing Firms in Taiwan." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/78910617325146833711.
Full textAbstract:
碩士中原大學
企業管理研究所
99
Abstract Production is the economic lifeline of a country. And machine tool is the center of production. Machine tool is a field which affects the widest aspect in Machine Industry. It relates not only with industrialization but also economic development of the whole industry. It is the most important issue of business administration for Taiwan machine tool industry how to respond external environment change such as government policy ECFA, enhancing the inner core competitive ability of enterprises, how to draw up future business strategy, exercising strategy management, integrating business goals, and avoiding being weeded by market competition, to achieve the purpose of business continuous survival. The purposes of this study can be generalized to as below. 1. To discover the business strategy of existing machine Tool firms. 2. To analyze the dimensions of business strategy of machine tool makers. 3. To establish the basic business strategy model of machine tool firms in the case to develop feasible strategic proposals. 4. To provide machine tool firms a consult for drawing up the strategy and strategic decision. This study proceeded by deeply interview and research of case study. Five representative firmks in Taiwan are chosen to be the research cases.Strategy matrix analysis is used to discuss the strategy of present difficulty, variety, competition advantage of business strategy, and future strategy aspect for Taiwan machine tool industry. This study offers some practical suggestions to the Taiwan machine fool firms.
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Chen, chen-hsiang, and 陳正祥. "The Servitization of Manufacturing Capability Model in Machine Tool Industry." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/09796728847810938135.
Full textAbstract:
碩士長榮大學
高階管理碩士在職專班(EMBA)
102
In the top ten countries producing machine tools, Since the domestic demand market is weak and only specific industries are supported by the government, machine tools and parts industry in Taiwan may only focus on overall marketing strategy, to aggressively serve consumer markets and customers from all folks all over the world, and provide them with customized and differentiated service. Hence, the servitization of machine tools industry was a booming field for Taiwan’s industry to enter. Nevertheless, few researches discussed about the servitization of machine tools industry in Taiwan, this research developed the measurement scale for servitzation capability of machine tools industry through exploratory analysis. The scale was developed through literature review, Delphi method and exports interview, to deeply discuss the nature of the industry, dimensions and evaluation indices. In developing the measurement model, Item-Total Correlation and Cronbach's coefficient are adopted for reliability test, to measure the internal consistency and stability of the scale. After gaining the weights system of measuring indices through AHP, IPA (Importance Performance Analysis) is also adopted to decide the priority of matrix analysis in servitization of machine tools industry. The research results show the machine tools industry is adequate for servitization with five main evaluation principles and eight evaluation indices. The most important principle is “overall performance of servitization”, followed by “ability of customization”, “ability of servitiztion technology” (with the most important index: grasping customers’ need), “sculpturing value statement” (with the most important index: building the internal process and core competency) and “ability of construct trading criterions” (with the most important index: rights and obligations criterions).