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Kumar, Eshwar. "Optimal choice of machine tool for a machining job in a CAE environment." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4512.
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Developments in cutting tools, coolants, drives, controls, tool changers, pallet changers and the philosophy of machine tool design have made ground breaking changes in machine tools and machining processes. Modern Machining Centres have been developed to perform several operations on several faces of a workpiece in a single setup. On the other hand industry requires high value added components, which have many quality critical features to be manufactured in an outsourcing environment as opposed to the traditional in-house manufacture. The success of this manufacture critically depends on matching the advanced features of the machine tools to the complexity of the component. This project has developed a methodology to represent the features of a machine tool in the form of an alphanumeric string and the features of the component in another string. The strings are then matched to choose the most suitable and economical Machine Tool for the component’s manufacture. Literature identified that block structure is the way to answer the question ‘how to systematically describe the layout of such a machining centre’. Incomplete attempts to describe a block structure as alphanumeric strings were also presented in the literature. Survey on sales literature from several machine tool suppliers was investigated to systematically identify the features need by the user for the choice of a machine tool. Combining these, a new alphanumeric string was developed to represent machine tools. Using these strings as one of the ‘key’s for sorting a database of machine tools was developed. A supporting database of machine tools was also developed. Survey on machining on the other hand identified, that machining features can be used as a basis for planning the machining of a component. It analysed various features and feature sets proposed and provided and their recognition in CAD models. Though a vast number of features were described only two sets were complete sets. The project was started with one of them, (the other was carrying too many unwanted details for the task of this project) machining features supported by ‘Expert Machinist’ software. But when it became unavailable a ‘Feature set’ along those lines were defined and used in the generation of an alphanumeric string to represent the work. Comparing the two strings led the choice of suitable machines from the database. The methodology is implemented as a bolt on software incorporated within Pro/Engineer software where one can model any given component using cut features (mimicking machining operation) and produce a list of machine tools having features for the machining of that component. This will enable outsourcing companies to identify those Precision Engineers who have the machine tools with the matching apabilities. Supporting software and databases were developed using Access Database, Visual Basic and C with Pro/TOOLKIT functions. The resulting software suite was tested on several case studies and found to be effective.
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Hochmuth, Carsten Alexander. "Rapid machine tool design." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9373.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.<br>Includes bibliographical references (p. 206-208).<br>Rapid Machine Tool Design encompasses new materials and manufacturing and design processes that increase the speed and flexibility of the machine tool development process. Rapid design implies increased concurrency and overlap of design process steps, and it allows a quick and efficient response to market opportunities for new types of components or machinery. Rapid manufacturing implies use of new materials with reduced lead times for tooling and "one-off" components, simplified and deterministic processes and cost effective methods for customization and modular system design. This thesis describes design and manufacturing methods for polymer concrete structures in precision machine tools. The focus is on the modularity and unique capabilities of this process for rapid development of manufacturing equipment. Detailed material properties and process descriptions are presented. Traditionally, only the polymer concrete casting process is described, and the thesis expands on the discussion by reviewing the design process and other phases of the full machine tool life cycle. An understanding of the critical factors in the material composition and processing helps the designer understand possible variations in the polymer concrete mechanical properties and quality. This thesis contributes to the body of work on polymer concrete by providing a detailed guide for designing structural components, with analytical tools were applicable and examples from an actual machine design project. This thesis presents a comprehensive set of new design guidelines on how to build polymer concrete parts and tooling, merging the needs of the machine designer and the tooling builder. The thesis also presents a case study of a complete machine tool design with a polymer concrete structure. Methods and guidelines described in this thesis are successfully applied in the development and manufacture of the machine tool. The case study and the design chapters demonstrate that use of polymer concrete can be an enabling element for rapid machine tool design.<br>by Carsten Alexander Christoph Hochmuth.<br>Ph.D.
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Wasson, Kevin L. (Kevin Lee). "Hydrostatic machine tool spindles." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/41029.
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Includes bibliographical references (p. 300-301).<br>Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.<br>This work investigates the application of hydrostatic bearings, particularly those of the self-compensating type, to precision machine tool spindles. First, relations are developed that can be used to calculate the hydraulic resistances of various bearing land flows in tilted and untilted orientations. These relations are then applied to predicting the load carrying characteristics of several different types of hydrostatic bearings. The bearing calculations are then integrated with shaft bending calculations to predict static spindle stiffness. Relations are also presented to calculate the frictional and thermal characteristics of the bearings at high speeds. The relations developed are compared to experimental data collected on three prototype test spindles. These spindles were found to have excellent qualities that represent a significant advance in machine tool spindle technology. Finally, a design case study is presented that illustrates how the methods developed in this work may be applied to practical spindle design.<br>by Kevin L. Wasson.<br>Ph.D.
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Li, Wei. "Dynamic Reconfigurable Machine Tool Controller." BYU ScholarsArchive, 2005. https://scholarsarchive.byu.edu/etd/235.
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This dissertation presents a dynamic reconfigurable control strategy based on the Direct Machining And Control (DMAC) research at Brigham Young University. A reconfigurable framework is proposed which will allow a machine tool to be controlled by a variety of applications and control laws. This Reconfigurable Mechanism for Application Control (RMAC) paradigm uses a hierarchical architecture to configure a mechanism into a device driver for direct control by an application like CAD/CAM. The RMAC paradigm is one of a mechanism device driver assigned to each mechanism class or model, and uses only the master model to control the mechanism. The traditional M&G code language is no longer necessary since motion entities are passed directly to the mechanism. The design strategy of using dynamic-link libraries (DLL) to form a mechanism device driver permits a mechanism to assume different operating configurations, depending on the number of axes and machine resolution. For example, the machine can perform as a material removal machine in one instant, and then, by loading a new device driver, act as a Coordinate Measuring Machine (CMM). This strategy is possible because RMAC is a software and networked-based control architecture. Both the CAD/CAM planning software and the real-time control software reside on the same PC. The CAM process plan can thus directly control the machine without need for process plan decomposition into the forms supported by the controller. The architectural framework is explained in detail and the methodology for control software reconfiguration into a device driver is presented. For demonstration purposes two device drivers are implemented on a prototype machine to demonstrate feasibility and usefulness.
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Tan, Johnson Cheah-Shin. "A machine utilization analysis tool." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37773.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.<br>Includes bibliographical references (leaves 76-77).<br>by Johnson Cheah-Shin.<br>M.S.
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Liang, Jiangang. "Development of logical models for CNC machine tool motion control system with application to virtual machine tool design /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
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Zhang, Li. "Accuracy enhancement of a hexapod machine tool /." Essen : Vulkan-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2864795&prov=M&dok_var=1&dok_ext=htm.
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Rahbary, Asr M. A. "Computer assisted machine tool part-program optimisation." Thesis, Coventry University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279418.
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Newton, Jeffrey Michael. "Vibration control in a machine tool barfeed." Thesis, University of Huddersfield, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254734.
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RAJAGANAPATHY, SUNDAR VISHAL. "Concept Generation Techniques for Machine Tool Design." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281741.
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Technological advancements are reaching new milestones in modern world. The demand for innovations and discoveries in each field is growing greater. This is the challenge in front of product designers. This thesis is about designing a mechanism for a machine tool. Machining tools are used from manual lathes to modern automated Computer Numerical Control machines. Turning operation is one of the basic stages in machining workpiece. Wiper inserts are used in final stage of turning for better surface finish due to their multi-point radii. But to use efficiently, positioning tool edge is necessary. Requirements are drafted based on this objective. So, developing a mechanism to perform this function is the foundation. Understanding various concept generation techniques in design field is necessary. Such techniques are described in literature section and later applied in thesis. A systematic approach is drafted for developing concepts. Then concepts are developed using these techniques. These concepts are evaluated based on weightage criteria. Then concepts are selected for detail design and prototype manufacturing. These chosen concepts are simulated to validate and to analyse mechanical properties. It is concluded that one simple concept is better than others in performance and utility. Finally, the thoughts for future work are stated. This work provides a brief idea on approaching product development.<br>Tekniska framsteg når nya milstolpar i den moderna världen. Efterfrågan på innovationer och upptäckter inom varje område blir större. Detta är utmaningen för produktutvecklare. Det här examensarbetet handlar om att designa en mekanism för ett verktygsmaskin. Verktygsmaskiner används i allt från manuella svarvar till moderna automatiserade numeriskt styrda verktygsmaskin. Svarvning är ett av grundstegen i bearbetningen av ett arbetsstycke. Wiperskär används i slutskedet av svarvning för bättre ytfinish (ytfinhet) tack vare flerpunktsradier. Men för att ett wiperskär ska kunna navändas efektivt är positionering av verktygskanten nödvändigt. Krav för urformas utifrån detta mål och att utveckla en mekanism för att utföra den här funktionen är därmed grundläggande. Förståelse för olika konceptgenereringstekniker inom design är nödvändig. Sådana tekniker beskrivs i litteraturavsnittet och tillämpas senare i examensarbetet. Ett systematiskt tillvägagångssätt utarbetas för att utveckla koncepten. Sedan utvecklas koncepten med dessa tekniker. Dessa koncept utvärderas utifrån viktningskriterier. Sedan väljs koncept för detaljdesign och prototyptillverkning. Dessa valda koncept simuleras för att validera och analyseras mekaniska egenskaper. Slutsatsen är att ett enkelt koncept är bättre än andra när det gäller prestanda och nytta. Slutligen formuleras förslag på framtida arbete. Detta arbete ger inblick i hur det är att närma sig produktutveckling.
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Gao, Jian. "Dynamic position sensing for parallel kinematic machine and new generation machine tool." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268479.
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Smirnova, Tatiana. "Dynamic Analysis and Modeling of Machine Tool Parts." Licentiate thesis, Karlskrona : Department of Signal Processing, School of Engineering, Blekinge Institute of Technology, 2008. http://www.bth.se/fou/Forskinfo.nsf/allfirst2/8628d01b6722765cc12573e70044bfd2?OpenDocument.
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Jisheng, E. "Sliding wear of materials for machine tool elements." Thesis, Brunel University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295201.
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馮偉興 and Wai-hing Anthony Fung. "Distribution channel strategies of Japanese machine tool builders." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31264323.
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Fung, Wai-hing Anthony. "Distribution channel strategies of Japanese machine tool builders /." [Hong Kong : University of Hong Kong], 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1237443X.
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Fredin, Johan. "Modelling, Simulation and Optimisation of a Machine Tool." Licentiate thesis, Karlskrona : Department of Mechanical Engineering, School of Engineering, Blekinge Institute of Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00450.
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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.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.<br>Vita.<br>Includes bibliographical references.<br>by Dai Gil Lee.<br>Ph.D.
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Edem, Isuamfon. "Energy modelling for machine tool axis and toolpaths." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/energy-modelling-for-machine-tool-axis-and-toolpaths(2ab542b7-5e6e-4385-9acf-1b7a8e14be2b).html.
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The manufacturing sector is one of the significant consumers of electricity, with about 42.3% (8249 TWh) of the global electricity consumption attributable to this sector. This electricity is generated from fossil fuels at the power stations, resulting in increased CO2 emission and subsequently global warming. Thus, energy efficiency could play a vital role in reducing electrical energy demand and environmental impacts in the manufacturing sector. Mechanical machining is one of the widely used techniques in manufacturing. Machine tools consist of auxiliary units, spindle, feed axes including the x-axis, y-axis, z-axis, and the tool change system which are the main electrical energy consumers. The feed axes control the relative motion between the workpiece and cutter, and also determine the workpiece geometry. In literature, a number of studies focused on the machining process as a whole, while the energy demand for axis and toolpaths was relatively unexplored. This PhD research was aimed at assessing the electrical energy demand in mechanical machining, focusing on feed motions and toolpaths in order to identify energy saving strategies of the machine tool. To achieve this, a current measurement device was used to acquire the current and voltage, from which the power and electrical energy requirements were evaluated. This study included (i) energy consumption analyses of the machine tool in different feed axes directions, (ii) cutting of components in different axes orientations (iii) and electrical energy demand studies of different toolpath strategies. From the study, a new method and model for predicting the electrical energy demand of feed axes was developed. This model encompasses the weights of feed axes, machine tool vice, and workpiece placed on the machine table. Moreover, the newly developed feed axes energy demand model was integrated into other energy consumption models to predict the energy demand for toolpaths. CNC toolpaths are generated manually or by computer aided manufacturing (CAM). Enabling an energy rating of CNC toolpaths is vital to be able to quantify energy demand, compare toolpaths, and develop energy demand reduction strategies. The results show that machining along the x-axis which carries minimal weights significantly reduced the energy demand of the feed drive, which in turn reduces the non-cutting energy demand of the machine tool. Thus, this Thesis contributes to the improvement of energy efficiency in machining through the development of a new and novel model and method for predicting the feed axes energy demand; determining the most efficient axes and component orientation; as well as the most efficient toolpath strategy for minimal energy demand in machining. This PhD Thesis has laid the foundation model and information source for a post processor to estimate energy demand from CNC toolpaths. Such a capability was not available in CAM software or on CNC machines.
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Žůrek, František. "Návrh kompaktního stroje pro třískové obrábění klíčů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-316369.
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This master thesis Design of a machine tool for a safety keys production deals with concept of a machine tool for production of safety keys. Solution variants are methodically elaborated, mainly concerning their achieved tact times and machine dimensions. A computation diagram for fast comparison of concepts in case of different customer key specification is presented. Chosen concept version is then detailed designed. The result fills a hole on the market of specific machine tools for machining of safety keys.
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Wang, Zhanchen. "Chatter analysis of machine tool systems in turning processes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63715.pdf.
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Lingard, Lonnie Louis. "A study of Wisconsin technical colleges' machine tool programs." Online version, 1998. http://www.uwstout.edu/lib/thesis/1998/1998lingardl.pdf.
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Melvin, Jason W. (Jason Webley). "Design of a kinematic coupling for machine tool fixturing." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10556.
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Pande, Monali. "Visual Analytics Tool for Java Virtual Machine Execution Traces." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-249716.
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The usage of multithreaded programs is continuously increasing, which leads to various concurrency issues. The non-deterministic approach of the thread scheduler makes the analysis of such programs complex. Thread-based visualization of the concurrent events helps to analyze a concurrent program efficiently. The extension of such visual analytics jpf-visual tool for regular JVM traces will help Java programmers to better understand and analyze the runtime execution of concurrent programs. AspectJ instrumentation with its lock() and unlock() pointcut extension makes it possible to capture important runtime events information in order to generate the JVM event trace. A successful integration of the JVM trace into the jpf-visual tool is achieved through code refactoring and the use of adapter classes. In this thesis, the implementation of such an approach is shown to analyze the concurrent events using the regular JVM. Such implementation can help to provide a generic approach for the concurrency issue analysis.<br>Användandet av flertrådade program ökar numera ständigt, och det kan leda till en mängd olika problem rörande samtidighet. Analysen av sådana program är komplicerad på grund av den icke-deterministiska algoritmen som används av operativsystemets schemaläggare. Visualiseringen av samtidiga händelser, baserad på trådar, hjälper oss analysera samtidiga program effektivt. Utvidgningar så som det visuella analytiska verktyget jpf-visual för JVM kommer att hjälpa Javaprogrammerare att bättre förstå och analysera körning av samtidiga program. AspectJ instrumentationen med dess brytpunktsutvidningar lock() och unlock() gör det möjligt att fånga upp viktig information rörande körningshändelser för att kunna generera ett JVM händelsespår. En lyckad integrering av JVM-spåret med verktyget jpf-visual utförs genom omstrukturering av kod och användning av adapterklasser i det existerande verktyget. Implementationen av en sådant tillvägagångssätt för standard JVM presenteras preliminärt i detta arbete, och det visar att det är möjligt att analysera samtidiga händelser genom att använda standard JVM. En sådan implementation kan bidra med en generisk lösning för analys av samtidiga program.
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Spall, Roger Paul. "A human-machine interaction tool set for Smalltalk 80." Thesis, Sheffield Hallam University, 1990. http://shura.shu.ac.uk/20389/.
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This research represents an investigation into user acceptance of computer systems. It starts with the premise that existing systems do not fully meet user requirements, and are therefore rejected as 'difficult to use'. Various problems and influences affecting user acceptance are identified, and improvements are suggested. Although a broad range of factors affecting user acceptance are discussed, emphasis is given to the impact of actual computer software. Initially, both general and specific user interface software influences are examined, and it is shown how these needs can be met using new software technology. A new Intelligent Interface architecture model is presented, and comparisons are made to existing interface design approaches. Secondly, the role of empirical work within the field of Human Computer Interaction is highlighted. An investigation into the usability and user. acceptance of a large working library database system is described, and the results discussed. The role of Systems Analysis and Design and its effect upon user acceptance is also explored. It is argued that despite improvements in interface technology and related software engineering techniques, a software application is also a product of the Systems Analysis and Design process. Traditional Systems Design approaches are examined, and suitable improvements suggested based upon experience with emerging separable software architectures. Thirdly, the research proceeds to examine the potential of Quantitative User Modelling, and describes the implementation of an example object oriented Quantitative User Model. This is then evaluated in order to determine new knowledge, concerning the major issues surrounding the potential application of user modelling to interface design. Finally, attention is given to the concept of interface and application separation. An object oriented User Interface Management System is presented, and its implementation in the Smalltalk 80 programming language discussed. The proposed User Interface Management System utilises a new software architecture which provides explicit user interface separation, using the concept of a Pluggable View Controller. It also incorporates an integrated design Tool-set for Direct Manipulation interfaces. The proposed User Interface Management System and software architecture represents the major contribution of this project to the growing body of Human Computer Interaction research. In particular, the importance of explicit interface separation is established, and the proposed software architecture is critically evaluated to determine new knowledge concerning the requirements, constraints, and potential of proper user interface separation. The implementation of an object oriented Part Hierarchy mechanism is also presented. This mechanism is related to the proposed User Interface Management System, and is critically evaluated in order to add to the body of knowledge concerning object oriented systems.
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ERIKSSON, HÅKAN, and MARTIN SCHÖN. "Using a machine translation tool to countercross-language plagiarism." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157497.
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Cross-language plagiarism is a type of plagiarism where texts from one languageare translated to another, concealing the origin of the text. This study tested if Google’s machine translation tool could be used as a preprocessor to a plagiarism detection tool in order to increase detection of cross-language plagiarism. It achieved positive results for detecting plagiarism in machine translated texts, while craftier plagiarised translations with higher degrees of obfuscation were harder to detect. Utilising even simple tools such as Google’s machine translation tool thus seems to indicate that steps to solving the problem of cross-language plagiarism can be taken.
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Barclay, Michael John. "Reference object choice in spatial language : machine and human models." Thesis, University of Exeter, 2010. http://hdl.handle.net/10036/3163.
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The thesis underpinning this study is as follows; it is possible to build machine models that are indistinguishable from the mental models used by humans to generate language to describe their environment. This is to say that the machine model should perform in such a way that a human listener could not discern whether a description of a scene was generated by a human or by the machine model. Many linguistic processes are used to generate even simple scene descriptions and developing machine models of all of them is beyond the scope of this study. The goal of this study is, therefore, to model a sufficient part of the scene description process, operating in a sufficiently realistic environment, so that the likelihood of being able to build machine models of the remaining processes, operating in the real world, can be established. The relatively under-researched process of reference object selection is chosen as the focus of this study. A reference object is, for instance, the `table' in the phrase ``The flowers are on the table''. This study demonstrates that the reference selection process is of similar complexity to others involved in generating scene descriptions which include: assigning prepositions, selecting reference frames and disambiguating objects (usually termed `generating referring expressions'). The secondary thesis of this study is therefore; it is possible to build a machine model that is indistinguishable from the mental models used by humans in selecting reference objects. Most of the practical work in the study is aimed at establishing this. An environment sufficiently near to the real-world for the machine models to operate on is developed as part of this study. It consists of a series of 3-dimensional scenes containing multiple objects that are recognisable to humans and `readable' by the machine models. The rationale for this approach is discussed. The performance of human subjects in describing this environment is evaluated, and measures by which the human performance can be compared to the performance of the machine models are discussed. The machine models used in the study are variants on Bayesian networks. A new approach to learning the structure of a subset of Bayesian networks is presented. Simple existing Bayesian classifiers such as naive or tree augmented naive networks did not perform sufficiently well. A significant result of this study is that useful machine models for reference object choice are of such complexity that a machine learning approach is required. Earlier proposals based on sum-of weighted-factors or similar constructions will not produce satisfactory models. Two differently derived sets of variables are used and compared in this study. Firstly variables derived from the basic geometry of the scene and the properties of objects are used. Models built from these variables match the choice of reference of a group of humans some 73\% of the time, as compared with 90\% for the median human subject. Secondly variables derived from `ray casting' the scene are used. Ray cast variables performed much worse than anticipated, suggesting that humans use object knowledge as well as immediate perception in the reference choice task. Models combining geometric and ray-cast variables match the choice of reference of the group of humans some 76\% of the time. Although niether of these machine models are likely to be indistinguishable from a human, the reference choices are rarely, if ever, entirely ridiculous. A secondary goal of the study is to contribute to the understanding of the process by which humans select reference objects. Several statistically significant results concerning the necessary complexity of the human models and the nature of the variables within them are established. Problems that remain with both the representation of the near-real-world environment and the Bayesian models and variables used within them are detailed. While these problems cast some doubt on the results it is argued that solving these problems is possible and would, on balance, lead to improved performance of the machine models. This further supports the assertion that machine models producing reference choices indistinguishable from those of humans are possible.
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Mitchell, Shannon Jean. "Choice and Preferences Based on Themes in Slot Machine Play." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1796.
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The present study examined choice and preference of slot machines between two groups based on the themes of slot machine. Twenty-one participants split into two group based on random assignment. A choice group that had the opportunity to change slot machines at any time, and the preferred choice group that only could play on the most preferred slot machine, were compared on the dependent measures of betting and response latency. Results demonstrated that there was no significant differences between groups on the dependent measure. Further analysis of within subjects demonstrated that wins in one phase was somewhat correlated with bets in the following phase; however, these effects were not at a significant level. Implications of this research are discussed.
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Bisen, Pradeep Siddhartha Singh. "Predicting Operator’s Choice During Airline Disruption Using Machine Learning Methods." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18839.
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This master thesis is a collaboration with Jeppesen, a Boeing company to attempt applying machine learning techniques to predict “When does Operator manually solve the disruption? If he chooses to use Optimiser, then which option would he choose? And why?”. Through the course of this project, various techniques are employed to study, analyze and understand the historical labeled data of airline consisting of alerts during disruptions and tries to classify each data point into one of the categories: manual or optimizer option. This is done using various supervised machine learning classification methods.
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Yang, Heeseung. "Technology, choice, and competitiveness the case of the machine tool industries in the U.S. and Japan /." 1988. http://catalog.hathitrust.org/api/volumes/oclc/23740601.html.
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Chiang, Yueh-Feng, and 江岳峰. "The Value Creation of Oversea Agents in Tool machine Industry：The Perspectives of Tool Machine Manufacturers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17285664031275733161.
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碩士<br>雲林科技大學<br>企業管理系碩士班<br>98<br>Based on the review of related literature, most previous researches in discovering customer value creation issues focused on B2C relationship, and B2B customer value creation researches mostly took manufacturers on manufacturers as research samples. However, the agents also play a significant role in the marketing field. Most of the tool machine manufacturers in Taiwan are small-and-medium-sized enterprises (SMEs) and they are export-oriented. Therefore, cooperating with local agents is the most appropriate entry strategy. From the perspectives of tool machine manufacturers, the study aiming to explore the causes and effects of value creation in foreign agents on domestic machine tool manufacturers gives a significant and unprecedented meaning.
Taiwan tool machine manufacturers were selected as research samples to explore the value creation activity in foreign agents on domestic machine tool manufacturers. Grounded theory method was used for data collecting and analysis. The major findings are as follows. Foreign agents should have three capabilities in the value creation: financial operations, sales experience and capabilities and maintenance techniques. Manufacturers provide five mechanisms: information sharing, sales incentives, technical supporting, education and training and contract agreements. Under the combination of capabilities and mechanisms, agents can bring five customer values for manufacturers: market expanding, information providing, product innovation and improvement, cost reducing and promotion assistance.
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Zhixuan, Zhang, and 張智軒. "Identify dynamic characteristics and application of spindle-tool system and Machine footing for machine tool." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/jh2k8p.
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碩士<br>國立中正大學<br>機械工程系研究所<br>105<br>Two important techniques of machine tool based on receptance coupling subsys-tem analyses(RCSA) and operational modal analysis(OMA) are proposed and realized. The first is estimations of the natural frequency and mode shape of the spindle-tool sys-tem of machine tools based on RCSA. The second is the health diagnosis of machine footing of machine tools using OMA.
The spindle-tool subsystem of machine tools includes three main components, i.e. a spindle, a holder and a tool. In this paper, all the components are simplified and mod-eled as beam structures. It is worth of noting that the spindle receptance is determined by experimental modal analysis (EMA), whereas the handle and tool are obtained theo-retically. Then the components are integrated to be a spindle-tool system using RCSA. The natural frequency of the spindle–tool system is determined and compared with that from the EMA. Results show that the natural frequency estimated from the RCSA is 10% as compared with that from EMA.
The machine footing of machine tools not only provides the machine level adjust-ment but also reduces the vibration transmission and noise. In the second part of this study, a health diagnosis of machine footing using OMA is introduced. From both nu-merical and experimental results show that the first six natural frequency and the corre-sponding mode shapes of a machine tool, i.e. the rigid body modes are good candidates in diagnose the machine footing. Moreover, the first six mode shapes are more sensitive than the natural frequency to the healthy state of machine footing.
The first six mode shapes from the machine tool which has been setup properly in the beginning are designated as reference modes, whereas the mode shapes acquired from the machine tool later on are called the targeted modes. The healthy state of ma-chine footings can be assessed and monitored by quantifying the difference between the targeted and the reference mode shapes using modal assurance criteria (MAC). Results show that the healthy state of machine footing can be monitored successfully with rea-sonable accuracy. Moreover, this proposed machine footing monitoring technique can be used in setting up a machine tool in a new environment.
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Chih-YinLin and 林芝吟. "Development of Machine-Tool Recommendation Cloud Service based on Ontology Inference Technology for Machine Tool Industry." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/23j6xh.
Full textAbstract:
碩士<br>國立成功大學<br>製造資訊與系統研究所<br>102<br>In this paper, we design and implement an Ontology Inference Cloud Service (OICS) system and a cloud-based auto scaling mechanism. The OICS system provides Ontology inference-based machine tool recommended service, so that manufacturing process engineers can use OICS to find suitable cutting tools for cutting the specified workpiece. For supporting multi-user scenarios, the OICS can dynamically scale up and down cloud resources according to the pre-defined scaling rules. In addition, the core mechanism of cloud-based ontology inference can publish standalone packages (such as virtual machine tool package) as cloud services on the cloud platform, so that developers can integrate existing manufacturing packages in the OICS system to shorten the development period. In this thesis, we first describe the system framework of Ontology Inference Cloud Service. Secondly, we present the core mechanisms of the OICS system. Thirdly, we develop and build the OICS system in Azure, the public cloud platform of Microsoft Corp. Our system can provide users to create ontology Inference data and rules and inference on the Ontology data for finding out proper cutting tools. Finally, in the experiment, we use two scenarios to verify OICS feasibility and performance evaluation. This paper provides the use of cloud computing and Ontology inference systems for building a new knowledge application in the machine tool industry.
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Lin, Sung-Chi, and 林嵩錡. "Leveling Production for Machine Tool Assembly." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/68382332301861121300.
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碩士<br>逢甲大學<br>工業工程與系統管理學系<br>102<br>In Taiwan, assembling a large gantry type machining center normally takes months. The reason for this not only is because such machine tools are so difficult to assemble but the supply for key components of the machine tools is unstable. This study focuses on leveling the customer’s demands for the large gantry machining centers. Machine tools assembly is stage by stage. Different components and subassemblies are required for assembly at stages. The production schedule for launching assembly of a machine tool then affects the timing of demands for these components. Since lead times for some components are quite long and the supply is always not stable. In this study, a simulation model for scheduling assembly of large gantry type machining centers is developed and used to evaluate the impacts of leveling production by adjusting the timing of assembly launch to even the components consumptions.
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Chang, Chien-Fei, and 張建斐. "STUDY OF MACHINE TOOL DESIGN PROCESS." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/92909792388581565667.
Full textAbstract:
碩士<br>朝陽大學<br>工業工程與管理研究所<br>86<br>The Purpose of this study is to develop a hierachical framework for modeling machine tool design process. Because the design is a highly knowledge-based work, featured by its un-repetitiveness and that of no standardization, building a framework or modeling a design process is one of herculean tasks. The case taken here focuses on the complicated process of designing a machining center. The studying scope is limited at preliminary design stage. This is to develop a system model for machine tool design process, which can be provided to the industry as a planning reference model for their design process.
The core is how to build up a model, a framework of hierarchy, drill down the vast design process by a top-down approach, disaggregate the framework by levels-integration, function and mechanism, sub-system, component and parts, features and specification setting-five design levels all told. The framework provide IDEF0 model users not only with the principles and definition of the hierarchy but also a logic for the decomposition of a design process.
This writing is to illuminate what is the hierarchy of machine tool design process, how to integrate IDEF0 model with design activities and design factors, and how to build a system model for design process. The content of the study has been tried out and verified at KAFO Machinery Corporation, in the project of vertical machine center.
Keywords：Precision machine design, IDEF0 models, system modeling.
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LIAN, YAN-CHENG, and 連彥丞. "Parameter Optimization for Machine Tool Tuning." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/dge9c6.
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碩士<br>國立雲林科技大學<br>機械工程系<br>106<br>The five-axis machine tool is widely used in aerospace and automotive industries which takes high speed and high precision as the development goal, reacting to the short cycle and high-precision products demand in the industry. The Mechanism design, assembly process, controller parameters and environment factors all make influences on the high speed and the high precision.
In order to optimize the controller parameter and improve the machining accuracy and the machining time, Taguchi method is used to find out the best parametric combination and to meet the shortest positioning time and the optimum positioning accuracy.
Taguchi method is mainly used for single quality characteristic. In practice, we need to take multiple quality characteristics into consideration, so it is necessary to combine the two quality characteristics that is selected by weighting. After that, the weighting ratio is used to adjust the quality index for machining requirements of the workpiece. Finally, we will get the best parametric combination which meet the machining requirements.
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Ta-WeiYeh and 葉大維. "Turning Tool Monitoring using Machine Vision." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/17723114952472988617.
Full textAbstract:
碩士<br>國立成功大學<br>資訊工程學系<br>104<br>In recent years of Industry 4.0, Automation machinery production is currently the most basic request. The purpose of this thesis is to establish an online real-time capturing dynamic rotating tool image for image geometric analysis, and implement measurement tool automation. After the completion of the detection, correcting tool data and repairing to cut. This thesis is to capture dynamic rotating tool to detect. Two types of back light detection and frontlight detection are not the same functions. In the backlight, the camera capture rotating tool , then using pre-processing and cumulative methods, binary and ROI (region of interest) to find tool images. Then using line Hough transform to deburr tool image and find the tool radius measurement, tool length measurement, the spindle inclination detectors, tool breakage detection and tool wear detection. In the frontlight, using SIFT to stitch expanded view of tool, then expect to make some tool surface detection.
If tool image has a blur situation from high speed rotation, using Wiener filter to recover. Finally, collecting some results and expect the tool detection to be better and further development in the future.
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Liu, Yuan-Cheng, and 劉原呈. "Collision Detection of CGT Machine Tool." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/01087061748336287233.
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碩士<br>國立中正大學<br>機械系<br>93<br>Abstract
The main purpose of this study is to improve the efficiency of collision detection from Cartesian-Guided Tripod Machine Tool (CGT). Because when the machine tool was loaded into virtual environment, the file format of object is STL (Stereo Lithography). The STL file format is composed of triangle mesh models, so it contains a large number of data. In order to improve the efficiency of collision detection, the quick and accurate method of the collision detection was adopted here to determine whether the collision happens between objects.
The implementation of the interference detection in the study can be divided into three stages (cursory detection, careful detection, exquisite detection) to carry out detection in order. Cursory detection mainly uses the axis aligned bounding box of moving coordinate to wrap objects separately. Due to the motions of rotation and displacement occur in objects, the limitation conditions were added in for carrying out the interference detection. Using the method of bounding sphere, the careful detection is to carry out the interference detection by the remaining triangle mesh models after preliminary detection. The exquisite detection is to use few remaining triangle mesh models to carry out the final interference detection by given judgment expression derived by the author.
With this collision detection, it can be known that objects are interfered or not, so the loss caused by the improper operation can be avoided.
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Su, Jia-shiang, and 蘇嘉祥. "Tool Path Planning for a Table-Type Six-Axis Machine Tool." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/65116443139051903125.
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碩士<br>國立臺灣科技大學<br>機械工程系<br>88<br>Abstract
In this thesis, tool path planning of a table-type six-axis machine tool has been investigated. The tool path planning of the developed machine tool is different from the traditional approach. This is because the table-type six-axis machine tool is built based on parallel mechanisms. An effective method has been developed to analyze the motion among the machine tool and to determine tool path and tool orientation with the constraints of machine tool configuration and workpiece geometry. Examples have been demonstrated to illustrate this approach.
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FANG, YAN-WEN, and 方彥文. "Intelligent Tool Life Prediction Based on Spindle Current of Machine Tool." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/wnz97e.
Full textAbstract:
碩士<br>國立虎尾科技大學<br>機械與電腦輔助工程系碩士班<br>107<br>In recent years, the aerospace and the automobile industry are flourishing, and the competition of the manufacturing industry will be fierced. However, the requirements for products are not limited to correct dimensional accuracy and good surface finish, and more attention is paid for the rate of production. When the manufacturing process is fast diverse uninterrupted milling, the yield of product will be directly affected by the cutting tool wear. Therefore, it is more important to predict the tool life. However, domestic manufacturing rechanges cutting tools that were used to mill the workpieces for a periodic time, or they will buy an expensive image equipment in order to inspect the tool for real-time monitoring purposes, but this approach also increases production costs. In view of this, this study developed a simple and fast prediction system of tool life that can provide users with cutting life state of tool. This study is divided into two systems, tool life prediction and internet of things. First, tool life system uses a dynamometer to measure cutting force, and the system uses Servo Guide to catch spindle current, and then spindle current and cutting force were modeled and analyzed by using regression analysis and back-propagation neural network. Furthermore, we compare the ability of cutting force prediction to meet the accuracy of the system. The fitting results of cutting force showed that the polynomial regression was around 90.99%, and the back-propagation neural network was around 90.50%. Therefore, the system is possible to predict the actual cutting force by capturing the spindle current during the cutting process. Next, this study calculates the cutting force coefficients between the cutting tool and the aluminum alloy 7075-T6 that were helpful for the prediction of the cutting force, and the prediction accuracy is about 93.65%. Therefore, the average cutting force can be obtained regardless of any processing parameters after the cutting force coefficients are identified, and it can be predicted by spindle current. This research developed the intelligent prediction system that uses the capturing and calculation functions of the prediction system to determine the tool life. In the internet of things system, the secondary development system captured the machine's information, and the information of the mcahine will be uploaded to the PostgreSQL database for managing and storing, finally the information was presented on the Node-red web.
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chen, Ya-Hui, and 陳雅華. "Customer Relationship Management of CNC Machine Tool." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/56268579583821826841.
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碩士<br>朝陽科技大學<br>工業工程與管理系碩士班<br>90<br>The purpose of this research was to investigate the relationship between customer satisfaction and loyalty for product quality, service quality of machine tool industry. Four major inventories—product quality, service quality, customer satisfaction, loyalty, were constructed in this research. The data were collected from users of CNC machine tool by using four inventories mentioned previously.
Questionnaire investigation method was utilized in this study. By random sampling, 260 questionnaires were drew for conducting a field test. Among the questionnaires, 251 effective copies were generated. The research hypothesis was testified on these data by means of varieties of method including factor analysis, variance analysis, and Pearson correlation analysis.
After analyzing the data of questionnaires, eight conclusions can be drawn and listed as following:
1、 The product quality of CNC machine tool is appear to be satisfied. The related important degree of product quality, three factors are important for “product quality, “ “product function, “and “ product efficiency “.
2、 The service quality of CNC machine tool is appear to be disatisfied. The related important degree of service quality, two factors are disatisfied for service quality, “service physical, “ and “ service care “, two factors are important for service quality, “service reliability, “and “ service immediately “.
3、 The product price and product design of satisfaction and the whole customer satisfaction show positive correlation. Product price and product design influent customer satisfaction.
4、 The service physical, service immediately, service trust, and service care of satisfaction and the whole customer satisfaction show positive correlation. Service physical, service immediately, service trust, and service care influent customer satisfaction.
5、 Customer satisfaction and loyalty show significant correlation. The higher the customer satisfaction higher the loyalty.
6、 Under different company scope, the satisfaction of product quality and loyalty have significant influence. The more product resource a company has, the higher the loyalty.
7、 Under different repair and maintance ability, the satisfaction of service quality and important degree of product quality have significant influence. The higher the repair and maintance ability a company has, the lower the need of service from manufacturer.
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Chuang, Fu-Chun, and 莊富鈞. "A simulation study of machine tool assembly." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/52229634049230914797.
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碩士<br>逢甲大學<br>工業工程與系統管理學研究所<br>100<br>Machine Tool Assembly is one of the most important industries in Taiwan in past two decades. Essentially, assembling a modern CNC machine tool may take a few weeks or even months depending on factors such as the complexity of the machine structures, the supply of key components, management of human resources, and the utilization of required equipment or tools. When launching assembly for a machine tool, the most important concern is the spatial issue. Assembling a machine requires at least a space of 15~20 m2 and the space will be occupied as long as the machine is completed. This study focuses on two important decisions for many Taiwan machine tool manufacturers: determining which order should be launched for assembly next and which assemble-in-process machine should have higher priority to obtain the limited resources like equipment and tools, and human forces. A discrete-event simulation model for such a machine tool assembly system is developed to evaluate several scheduling rules for these two decisions. Simulation experiments are then properly designed and conducted under various system conditions for detailed investigation.
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Lin, Ping-Hung, and 林炳宏. "Nonlinear Static Analysis of Machine Tool Spindle." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/53411161558941559449.
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Whalley, R., Kambiz M. Ebrahimi, and A. A. Abdul-Ameer. "Hybrid modelling of machine tool axis drives." 2005. http://hdl.handle.net/10454/3951.
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No<br>The x-axis dynamics of a milling machine where the workpiece and saddle are mounted on supporting slides is considered. A permanent magnet motor, lead screw, ball nut and bearings are employed as the machine, traverse actuator mechanism. Hybrid, distributed¿lumped parameter methods are used to model the machine tool x-axis drive system. Inclusion of the spatial configuration of the drive generates the incident, travelling and reflected vibration signature of the system. Lead screw interactive torsion and tension loading, which is excited by cutting and input disturbance conditions, is incorporated in the modelling process. Measured and results from simulation exercises are presented in comparative studies enabling the dynamic characteristics of the machine to be identified under, no load and with the application of cyclic, cutting force disturbances. The effect of the lead screw length, cutting speed and hence the load disturbance frequency are examined and the resulting performance accuracy is commented upon.
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Chang, Yu-Che, and 張育哲. "Promotion of Spindle Stiffness for Machine-Tool." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/46nvsr.
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碩士<br>國立虎尾科技大學<br>機械與電腦輔助工程系碩士班<br>102<br>As industries take off rapidly and the product demand amounts growing up continuously, most of the related parts and components in a product rely on machine-tool equipment to produce eagerly. In response to global competition, the machining and manufacturing should all be fast, effective and efficient, thus the needs of machine tools are augmented naturally day by day. A high-speed spindle system is the heart of a machine-tool and a high-quality machine-tool is always coupled with a spindle system that has high stiffness and better performance. Since high stiffness spindle system may provide the better abilities to withstand cutting-loading and to keep cutting stability that may satisfy the precision machining requirements, which can help production rate promotion and increase added value effectively. Therefore, the design and manufacturing of a spindle system with stiffness promotion for better machining precision and stability is one issue that the precision spindle makers have to deal with at the present time.
A spindle design-aided software and a practical execution of experimental verification are combined together to develop a design technique for a high-speed spindle stiffness promotion construction. First of all, check all possible influencing factors on spindle stiffness and try to ascertain those main influencing factors or design parameters such as span of bearings, ball bearing contact angle, bearing preload, and bearing arrangement and configuration type in a spindle system, etc. Next, the spindle design-aided software is utilized to construct the geometrical model of a spindle system and to determine the spindle stiffness for each combination of design parameters. At the same time, the FEM is applied to simulate the modal analysis and temperature rise in bearings while heat sources generated in a spindle system are estimated preliminarily. By selecting spindle stiffness as an objective function which is subjecting to a constraint of bearing allowable temperature rise and the better design parameters combinations can thus be determined for expected spindle stiffness. A solid spindle system was fabricated according to this better design parameter combination. Finally, experiments were carried out on these spindle systems for static stiffness measurements, and monitoring on dynamic characteristics (run-out) and temperature rise in the bearings during the run-in tests. The results obtained from the simulations exhibits the similar trends to those of experiments. The major factors affecting the spindle stiffness are ball bearing contact angle, span of bearings, and bearing arrangement and configuration type. The greater is the contact angle of bearing and the smaller is the bearing span, the higher is the spindle stiffness which the higher temperature rise accompanied in operations unfortunately. For the bearing arrangement and configuration type, a better arrangement is with two bearings at the front-end and two at the rear in this improved spindle system.
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Chen, Zong-Ci, and 陳宗棋. "Development of A Machine Tool Monitoring System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/25pta9.
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碩士<br>國立虎尾科技大學<br>機械與電腦輔助工程系碩士班<br>102<br>For the factory to process part production, an operator needs to perform the process setting in front of the controller and keep an eye on the change of the machine status at all times. When the machine signals an error message, in addition to the on-site operator, managers in remote locations find it hard to grasp timely information, resulting in the inconvenience to the production management and difficulty in improving the efficiency. This study focuses on the research and development of monitoring system functions for users of the machine.
The monitoring system developed in this study applies Microsoft Visual Studio 2010 as the design interface tool and uses SkyMars Application Programming Interface (API), provided by Precision Machinery Research & Development Center, to develop the control interface connecting FANUS and HEIDENHAIN. This study uses TCP/IP Communications protocol to connect to the machine, to retract the information inside the controller back to the monitoring system via the network, and displays the machine operating status, allowing users to conveniently manage the machine.
The monitoring system developed in this paper is implemented on HEIDENHAIN and FANUC controllers, and is performed on 5-axis machine tools during the process to display various functional operations through the monitoring platform interface, including the machine tool coordinates, tool management, alarm display, parameter modification, program management, availability, and simulation interface of the visual machine tools, thus to achieve efficient management of machine tools
through the monitoring system.
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Chien, Shih-Yin, and 簡勢殷. "Identification Technology of Machine Tool Footings Stiffness." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5311026%22.&searchmode=basic.
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碩士<br>國立中興大學<br>機械工程學系所<br>107<br>In order to improve precision of machines, it is necessary to predict their dynamic characteristics. Model updating has been utilized to reduce the difference between the mathematical and experiment models in recent years.
Identified the footings stiffness of machine tool in this thesis using sensitivity-based model updating methodology. The positions of the perturbation mass are determined using the singular value decomposition (SVD) analysis of sensitivity matrix proposed by predecessors. Three models including plate-footings assembly, machine tool prototype, and beam-springs assembly are tested. Plate-footings assembly is utilized to demonstrate the feasibility of the model updating of footing stiffness. Machine tool prototype is regarded as a complex structure with large system matrices in the finite element method. The reduced order model is used to reduce the time of model updating process. Beam-springs assembly represents a multiple footings structure. The discrete Fourier series are utilized to reduce the number of design variables. Finally, the first two models are validated using experiment model analysis. The results show that this methodology successfully identifies the footings stiffness, and identification based on the full model is more accurate than that on the reduced order model, but the time of model updating of reduced order model is significantly less than the full model.
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LIN, SHENG-CHE, and 林聖哲. "Building Machine Intelligence for Tool Wear Prediction." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/99362590651301929521.
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碩士<br>朝陽科技大學<br>工業工程與管理系<br>104<br>The labor shortage problem in Taiwan is an emerged crisis and will become worse in the future. The government was forced to confront the problem with a “Production 4.0 policy”. Hoping that an intelligent and autonomous automation may relief the tension and provide advancement in technology, especially for the machine tool industry.
The quality of machining highly depend on the sharpness of the cutter tip. In the past, the examinations of the blades were carried out mainly by human expertise with manual or visual inspections. These operations can be replaced with numerical procedures using computer visions and artificial intelligence. If the inspection outcome were properly related to the NC program, then the tool wears may be analytically predicted according to the given NC tool path. The relation between the wear and the task will become the machine intelligence.
This research uses computer vision to capture tool wears task by task, and relate wear amounts bit by bit with the tool tip motions from an analyzed NC program and the spindle resistance using neural networks. The outcome shows that the prediction can be used to simulate tool wear before the cutting processes. Therefore, a proper tool selection or assignment, for economical and/or quality purpose, can be carried out by machine intelligence autonomously.
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Zheng-WeiLin and 林政緯. "Study of Machine Tool Performance Diagnosis System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/95086415938166633481.
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碩士<br>國立成功大學<br>製造資訊與系統研究所碩博士班<br>98<br>This study presents an effective system of performance diagnosis used in the diagnosis of machine tools, which expect to be immediately effective control machine tool performance. In this study, the machine tool performance diagnosis system can be timely to issue warning messages including excessive vibration, temperature overload, and extraordinary noise to avoid the machine tool operation overload or damage. First of all, by three-axis accelerometer, thermocouples, microphones and other sensors, the physical signal which is obtained by capture machine tools such as vibration, temperature, noise. Then transfer the signal data to the study of machine tool performance diagnosis system to achieve the effect of performance evaluation and diagnosis.
This study use MEMS sensors to extract the machine tools of the physical hardware signals. First, system uses the fuzzy logic theory in performance evaluation and determines the degree of ownership of all signals. Then through the classification of the membership defines the level of the categories to determine the performance which is normal or not. The system will determine abnormal items if the performance was abnormal.
First, analysis of each signal variation in the frequency domain by Fourier Transform, then reduce dimensionality through Principal Component Analysis. Assess the work of machine tools through the characteristics of the signal information. To establish the characteristic mathematical model from the signal data we recorded by Back Propagation Network. Then, determine the abnormal items through the percentage of error function. Finally, completed the function of diagnostics and forecast of performance of machine tool used the physical signal information through the diagnostic report of HMI. Provide the maintenance personnel as early as possible in response to operation through the early warning of diagnostic system of Machine tool to avoid the damage which to reduce the output of machine tool. Finally, completed the function of diagnostics and forecast of performance of machine tool used the physical signal information through the diagnostic report of HMI. Provide the maintenance personnel as early as possible in response to operation through the early warning of diagnostic system of Machine tool to avoid the damage which to reduce the output of machine tool.
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Tien, Wen-Bang, and 田文榜. "Second times post of machine machine tool machine improves the research of cutting the precision." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/05251274440362096319.
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碩士<br>國立中央大學<br>機械工程研究所碩士在職專班<br>98<br>At present many controllers’ functions are quite powerful and the serve’s responses can cause the cutting inaccuracy that overcomes the functions inside through controllers. But these controllers’ expenses are more than 100,000. Therefore, it’s certainly too big cost.
No matter Heidenhain or Fanuc’s controllers deal with questions of the corner’s inaccuracy that make use of the corner’s deceleration both. If we alter the NC code feedrate, we also can reach the target consequently. The traditional machines don’t need the high-priced equipment to update for getting better manipulation.
This text will examine the system with laser interferometer, BallBar and KGM systems, will set up Machining Center error and add and correct the parameter database, Second times to the post, in order to achieve the goal of improving the precision of cutting.
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Wang, Jen-hung, and 王仁宏. "Error Compensation for the Tool Center of a 5-Axis Machine Tool." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/24136480341365671942.
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碩士<br>逢甲大學<br>材料與製造工程所<br>99<br>To achieve the high precision required for 5-axis machine tools, error inspection and compensation are conducted after fabrication. Ihe geometric errors of the machine tools include the component errors and the assembly errors. In this study, a laser interferometer is used to measure the position errors that are consequently utilized to compensate for the positioning errors of the linear and rotational axes. After the compensation of linear axes, a double-ball bar is utilized to measure the dynamic error during the linear motion. In addition, a test bar is used to measure the errors of the axial lines formed in the spindle assembly. After the error compensation, a sphere-ball-testing bar and a three-directional-measuring watch are used to measure the tool-center error in 5-axis motion. Finally, a NAS-979-Cone cutting test is conducted to verify the precision of the 5-axis machine tool.