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Dissertations / Theses on the topic 'Machine-tools Machine-tools'

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1

Zheng, Wenbo, and Hongxi Zhong. "Reconfigurable Machine Tools Design Methodology." Thesis, KTH, Industriell produktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119082.

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In today’s industry, the competitive market, the short life time of the products and rapid change in customer demand forms a big trend of appearance of new manufacturing system. Reconfigurable Machine Tool (RMT) is a kind of solution for future machining systems, thus it can not only provide customized solutions to the operation requirements but also is cost-effective. Thethesis aims to create and implement methodology of RMT design for manufacturing industry. The methodology is introduced and extended according to the five principals of modular machine tool design. The methodology will be applied step by step herein so as to make the methodology more clear. First of all is to get the concept or process requirements from the customer. The customer requires three reconfigurable part families for a high speed milling application including tables, spindles, and cutters. In this case, to fulfill customer’s requirements and concept, the dual spindle (Multi-tool) RMT is selected as an example to interpret the RMT design methodology. Secondly, the most important point in methodology of RMT design is to analyze the valuable proposal of the four principles of modular design based on extensive experience. This work turns the four principles, separation, and unification (standardization), connection, and adaptation, to practical design methodology. Based on the classical four principles, the principle of reusability is an addition principal in consider of zero waste concept. In order to perform the RMT design methodology effectively, it is necessary to complement the advantages of the reconfiguration in dual spindle RMT design and the reconfiguration for other part families in according to the RMT design methodology. A final step utilizes computer software to model the configuration in 3 dimensions. And evaluations can be discussed in Degree of Freedom (DOF), stiffness analysis and number of modules.
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2

Águila, Rodríguez Guillermo, and Álamo Alcalde Adrián del. "Identification of machine tools´ locations." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-17432.

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The scope of this thesis will be focused on the machine FORMA Z1 which is one ofthe most functional amongst the sort of machines currently available in the market. Itprovides faster tool changes besides a huge variety of tool layouts with the possibility ofmaking a product with one only set up. Furthermore, the combi-beam rotation capability,together with dual sets of tools, give to the machine an exceptional competence.Through this project, some of the shortcomings in the usability of the machine are evaluatedto be able to give an accurate solution to provide it of extra functionalities, thusacquiring better efficiency during the performance. This solution consists of the developmentof a device which will aid the operator during the tool arrangement of the machine.The solution includes a platform with a laser that will point out where the operator mustplace the corresponding tool. The system will know where to locate it because the realmachine would generate an XML file which would contain all necessary data. All thisdata will be read by a computer and send it to the microcontroller that will control allthe system.The solution proposed improves the throughput and reduces the time needed in the bendingprocess increasing the facility in the process of bending metal sheet. However, thereare some disadvantages on the implementation of this device. The new machine wouldbe more expensive and the software would be changed to include the new system and theprogram that reads the XML document.
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Dhairyawan, Amit. "Internet Tools for Machine Design." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/36488.

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The aim of this thesis is to provide academic support to the oldest discipline of Mechanical Engineering, namely "Machine Design". The rapid pace of technological development drives every individual, especially students. The industrial revolution in the first half of the 19th century contributed greatly to the advancement of Mechanical Engineering. The theories and experimental data from that time, some developed almost a hundred years ago are still in use in the original form while others have evolved to keep up with the times. This thesis attempts to bring some of that classical machine design theory into a modern user-friendly form that is portable across the Internet. Here the user will be presented with an interactive menu of topics of Machine Design where each is split sub-categorically as Theory and Application. According to the choice made, short excerpts of theory are presented on the chosen matter. The theory will include but not be limited to the important relationships relevant to the design of the particular machine element. After the review of the Theory, the user will be able to navigate to the application where the relationships from the theory will be awaiting user input in the form of solvers. Since the primary emphasis of the thesis is about cultivating knowledge of the underlying theory, the applications will not be self-correcting or self-assuming. The user will need to understand the relationships sufficiently well prior to using the applications to solve homework or design assignments. The created Toolbox is available to all registered users through a login access. The user can then choose to review theory or directly access the applications of the described theory. The thesis successfully demonstrates the use of the Internet as the media for education.<br>Master of Science
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4

Hedderich, Johannes. "Thermal stability in machine tools." Thesis, KTH, Industriell produktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185117.

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Reliable and stable processes allowing precision manufacturing are a core demand in today’s production. To achieve stable processes several influences on machine tools have to be controlled. Beside the other factors, thermal influences are among the most important factors infecting the production system.In this work two problems that are caused by thermal deviations are considered: Firstly the positioning error of machine tools, and secondly possible changes in the elastic behaviour of a machine tool due to changes in stiffness.Positioning problems due to thermal changes are widely examined in research and the focus in this thesis is laid to a machine tool control program, developed and used by “Company A”, which will be explained and evaluated. This program is used both to evaluate new machine tools but also machine tools used in daily production. Also the standard method of Company A to compensate for thermal deviations in production is shortly evaluated.The connection between thermal deviations and changes in stiffness of a machine tool is a fairly new field in research. In this work tests were done using the Loaded Double Ball Bar (LDBB), a tool to measure the elastic behaviour of machine tools during movement. The changes observed in the machine tool are documented over time and different thermal states. A couple of machine tools of the same type but with different specifications are compared and differences and similarities are highlighted and evaluated.<br>Dagens produktion, som är sträver mot allt snävre toleranser och bättre precision kräver stabila och pålitliga processer. Flera faktorer som påverkar verktygsmaskiner måste kontrolleras för att nå en stabil process. Bredvid andra fakrorer har termiska förändringar en väldigt stor påverkan på produktions systemet.Det här arbetet undersökte två olika problem som framkallas av förändringen av termiska tillståndet, positionerings fel i verktygsmaskiner samt möjliga ändringar i maskinens styvhet.Termisk påverkan på positionerings felet av verktygsmaskiner är ett ämne som underöks av många forskare. Det här arbetet fokusserades därför på att undersöka ett program för att testa och kontrollera förändringar i verktygsmaskiner, framtagen av ett företag som kallas för ”Company A”. Själva programmet undersöktes och värderades. Programmet används av företaget både för att värdera nya maskina samt maskiner som används i daglig produktion. Dessutom undersöktes metoden av ”Company A” som används för termisk kompensering i daglig produktion.Sammanhanget mellan termiska förändringar och styvhet av en verktygsmaskin är ett någorlunda nytt forskningsämne. I det här arbetet utfördes tester med en Loaded Double Ball Bar (LDBB), ett verktyg som mätar elastiska egenskaper av en maskin under rörelse. Skillnader i maskinen som dokumenterades sattes i relation till tid och termiska förändringar. Några stycken maskiner av samma typ men med olika konfigurationer jämfördes och skillnader som likheter analyserades.
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5

Khʹep, Chan. "A design and analysis of an active deformable cutter /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2004.

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Thesis (Ph.D.)--Tufts University, 2004.<br>Advisers: Haris Doumanidis; Anil Saigal; Nikos Fourligkas. Submitted to the Dept. of Mechanical Engineering. Includes bibliographical references (leaves 72-73). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
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6

Cheatham, Robert Marshall. "A geometry-based motion planner for direct machining and control / /." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1983.pdf.

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7

Kanburoglu, Furkan A. "Distributed Control System For Cnc Machine Tools." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610599/index.pdf.

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&ldquo<br>Numerically Controlled&rdquo<br>(NC) machine tools, which are automatically operated by encoded (digital) commands, are capable of machining components with quality and quantity. Manufacturing industry heavily depends on these machines. Many different control architectures have been adapted in today&rsquo<br>s CNC technology. Centralized control system is quite popular in industry due to its ease of implementation. If the number of controlled axes on a CNC machine tool (&gt<br>3), increases so does the computational burden on the central processors. Hence, more powerful processors are needed. An alternative architecture, which is not commonly used in CNC technology, is the decentralized (distributed) control. In this topology, the tasks handled by the distributed controllers that are interconnected to each other by a communication network. As the need arises, a new controller can be added easily to the network without augmenting the physical configuration. Despite its attractive features, this architecture has not been fully embraced by the CNC industry. Synchronization among the axes in the coordinated motion is proven to be quite challenging. In this thesis, alternative distributed controller architecture was proposed for CNC machine tools. It was implemented on a 3-axis CNC milling machine. Open-loop control performance was investigated under various conditions. Different communication protocols along with different physical communication interfaces and a number of controller hardware were devised. An industry-standard network (RS-485) was set up by interconnecting these distributed controllers. Different data transmission protocols were devised in order to establish appropriate communication methods. Also, computer software (a.k.a. graphical user interface), which can coordinate the interconnected controllers, interpret NC part programs and generate reference position data for each axis, was designed within the scope of this thesis.
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8

Hall, Carsie Alvin. "Evaporative cooling effects in precision machine tools." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36012.

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9

Van, den Berg Gideon. "Hidden Markov models for tool wear monitoring in turning operations." Diss., Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-05302005-114238/.

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10

Harby, Donald. "Parametric and optimal design of modular machine tools." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4871.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2007.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on February 13, 2008) Vita. Includes bibliographical references.
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Park, Hyung Wook. "Development of micro-grinding mechanics and machine tools." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22692.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Dr. Steven Y. Liang; Committee Member: Dr. Chen Zhou; Committee Member: Dr. Paul Griffin; Committee Member: Dr. Shreyes N. Melkote; Committee Member: Dr. Steven Danyluk.
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12

Kanwar, John. "Smart cropping tools with help of machine learning." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74827.

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Machine learning has been around for a long time, the applications range from a big variety of different subjects, everything from self driving cars to data mining. When a person takes a picture with its mobile phone it easily happens that the photo is a little bit crooked. It does also happen that people takes spontaneous photos with help of their phones, which can result in something irrelevant ending up in the corner of the image. This thesis combines machine learning with photo editing tools. It will explore the possibilities how machine learning can be used to automatically crop images in an aesthetically pleasing way and how machine learning can be used to create a portrait cropping tool. It will also go through how a straighten out function can be implemented with help of machine learning. At last, it is going to compare this tools with other software automatic cropping tools.<br>Maskinlärning har funnits en lång tid. Deras jobb varierar från flera olika ämnen. Allting från självkörande bilar till data mining. När en person tar en bild med en mobiltelefon händer det lätt att bilden är lite sned. Det händer också att en tar spontana bilder med sin mobil, vilket kan leda till att det kommer med något i kanten av bilden som inte bör vara där. Det här examensarbetet kombinerar maskinlärning med fotoredigeringsverktyg. Det kommer att utforska möjligheterna hur maskinlärning kan användas för att automatiskt beskära bilder estetsikt tilltalande samt hur maskinlärning kan användas för att skapa ett porträttbeskärningsverktyg. Det kommer även att gå igenom hur en räta-till-funktion kan bli implementerad med hjälp av maskinlärning. Till sist kommer det att jämföra dessa verktyg med andra programs automatiska beskärningsverktyg.
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13

Mintz, David J. "Models for the development of precision machine tools." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/105290.

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14

Law, Mohit. "Position-dependent dynamics and stability of machine tools." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44804.

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Machine tool’s productivity and ability to produce a component of the required quality is directly influenced by its dynamic stiffness at the tool center point. Lack of dynamic stiffness may lead to unstable regenerative chatter vibrations which are detrimental to the performance. The chatter vibrations are influenced by the changing structural dynamics of the machine as the tool moves along the tool path, resulting in position-varying machining stability of the system. Evaluation of these varying dynamics at the design stage is a complex process, often involving the use of large order finite element (FE) models. Complexity and computational costs associated with such FE models limit the analyses to one or two design concepts and at only a few discrete positions. To facilitate rapid exploration of several design alternatives and to evaluate and optimize each of their position-dependent dynamic behavior, a generalized bottom-up reduced model substructural synthesis approach is proposed in this thesis. An improved variant of the component mode synthesis method is developed and demonstrated to represent higher order dynamics of each of the machine tool components while reducing the computational cost. Reduced substructures with position-invariant response are synthesized at their contacting interfaces using novel adaptations of constraint formulations to yield position-dependent response. The generalized formulation is used to evaluate the position-dependent behavior of two separate machine tools: one with a serial kinematic configuration, and another with hybrid serial-parallel kinematics. The reduced machine model is verified against full order models and is also validated against measurements by including joint characteristics in the model. The effects of position and feed-direction-dependent compliances on machining stability are investigated by using a novel position and feed-direction-dependent-process-stability performance criterion that evaluates the productivity of machine tools in its entire work volume. Parameters limiting the target productivity levels are identified and modified; and, the complete dynamics are rapidly re-analyzed using the developed models. Optimal design modifications are shown to increase productivity by ~35%. The proposed methods in this thesis enable efficient simulation of structural dynamics, stability assessment as well as interactions of the CNC and cutting process with the machine tool structure in a virtual environment.
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15

Ihlenfeldt, Steffen, Christian Brecher, Matthias Putz, and David Billington. "Conference on Thermal Issues in Machine Tools: Proceedings." Verlag Wissenschaftliche Scripten, 2018. https://tud.qucosa.de/id/qucosa%3A32644.

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Inhomogeneous and changing temperature distributions in machine tools lead to sometimes considerable quality problems in the manufacturing process. In addition, the switching on and off of aggregates, for example, leads to further fluctuations in the temperature field of machine tools. More than 100 specialists discussed these and other topics from the field of thermal research at the 1st Conference on Termal Issues in Machine Tools in Dresden from 22 to 23 March.:Efficient modelling and computation of structure-variable thermal behavior of machine tools S. Schroeder, A. Galant, B. Kauschinger, M. Beitelschmidt Parameter identification software for various thermal model types B. Hensel, S. Schroeder, K. Kabitzsch Minimising thermal error issues on turning centre M. Mareš, O. Horejš, J. Hornych The methods for controlled thermal deformations in machine tools A. P. Kuznetsov, H.-J. Koriath, A.O. Dorozhko Efficient FE-modelling of the thermo-elastic behaviour of a machine tool slide in lightweight design C. Peukert, J. Müller, M. Merx, A. Galant, A. Fickert, B. Zhou, S. Städtler, S. Ihlenfeldt, M. Beitelschmidt Development of a dynamic model for simulation of a thermoelectric self-cooling system for linear direct drives in machine tools E. Uhlmann, L. Prasol, S.Thom, S. Salein, R. Wiese System modelling and control concepts of different cooling system structures for machine tools J. Popken, L. Shabi, J. Weber, J. Weber The electric drive as a thermo-energetic black box S. Winkler, R. Werner Thermal error compensation on linear direct drive based on latent heat storage I. Voigt, S. Winkler, R. Werner, A. Bucht, W.-G. Drossel Industrial relevance and causes of thermal issues in machine tools M. Putz, C. Richter, J. Regel, M. Bräunig Clustering by optimal subsets to describe environment interdependencies J. Glänzel, R. Unger, S. Ihlenfeldt Using meta models for enclosures in machine tools F. Pavliček, D. P. Pamies, J. Mayr, S. Züst, P. Blaser, P. Hernández-Becerro, K. Wegener Model order reduction of thermal models of machine tools with varying boundary conditions P. Hernández-Becerro, J. Mayr, P. Blaser, F. Pavliček, K. Wegener Effectiveness of modelling the thermal behaviour of the ball screw unit with moving heat sources taken into account J. Jedrzejewski, Z. Kowal, W. Kwasny, Z. Winiarski Analyzing and optimizing the fluidic tempering of machine tool frames A. Hellmich, J. Glänzel, A. Pierer Thermo-mechanical interactions in hot stamping L. Penter, N. Pierschel Experimental analysis of the heat flux into the grinding tool in creep feed grinding with CBN abrasives C. Wrobel, D. Trauth, P. Mattfeld, F. Klocke Development of multidimensional characteristic diagrams for the real-time correction of thermally caused TCP-displacements in precise machining M. Putz, C. Oppermann, M. Bräunig Measurement of near cutting edge temperatures in the single point diamond turning process E. Uhlmann, D. Oberschmidt, S. Frenzel, J. Polte Investigation of heat flows during the milling processes through infrared thermography and inverse modelling T. Helmig, T. Augspurger, Y. Frekers, B. Döbbeler, F. Klocke, R. Kneer Thermally induced displacements of machine tool structure, tool and workpiece due to cutting processes O. Horejš, M. Mareš, J. Hornych A new calibration approach for a grey-box model for thermal error compensation of a C-Axis C. Brecher, R. Spierling, M. Fey Investigation of passive torque of oil-air lubricated angular contact ball bearing and its modelling J. Kekula, M. Sulitka, P. Kolář, P. Kohút, J. Shim, C. H. Park, J. Hwang Cooling strategy for motorized spindle based on energy and power criterion to reduce thermal errors S. Grama, A. N. Badhe, A. Mathur Cooling potential of heat pipes and heat exchangers within a machine tool spindleo B. Denkena, B. Bergman, H. Klemme, D. Dahlmann Structure model based correction of machine tools X. Thiem, B. Kauschinger, S. Ihlenfeldt Optimal temperature probe location for the compensation of transient thermal errors G. Aguirre, J. Cilla, J. Otaegi, H. Urreta Adaptive learning control for thermal error compensation on 5-axis machine tools with sudden boundary condition changes P. Blaser, J. Mayr, F. Pavliček, P. Hernández-Becerro, K. Wegener Hybrid correction of thermal errors using temperature and deformation sensors C. Naumann, C. Brecher, C. Baum, F. Tzanetos, S. Ihlenfeldt, M. Putz Optimal sensor placement based on model order reduction P. Benner, R. Herzog, N. Lang, I. Riedel, J. Saak Workpiece temperature measurement and stabilization prior to dimensional measurement N. S. Mian, S. Fletcher, A. P. Longstaff Measurement of test pieces for thermal induced displacements on milling machines H. Höfer, H. Wiemer Model reduction for thermally induced deformation compensation of metrology frames J. v. d. Boom Local heat transfer measurement A. Kuntze, S. Odenbach, W. Uffrecht Thermal error compensation of 5-axis machine tools using a staggered modelling approach J. Mayr, T. Tiberini. P. Blaser, K. Wegener Design of a Photogrammetric Measurement System for Displacement and Deformation on Machine Tools M. Riedel, J. Deutsch, J. Müller. S. Ihlenfeldt Thermography on Machine Tools M. Riedel, J. Deutsch, J. Müller, S. Ihlenfeldt Test piece for thermal investigations of 5-axis machine tolls by on-machine measurement M. Wiesener. P. Blaser, S. Böhl, J. Mayr, K. Wegener
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16

Adams, Andrew. "Tools and techniques for machine-assisted meta-theory." Thesis, University of St Andrews, 1997. http://hdl.handle.net/10023/13382.

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Machine-assisted formal proofs are becoming commonplace in certain fields of mathematics and theoretical computer science. New formal systems and variations on old ones are constantly invented. The meta-theory of such systems, i.e. proofs about the system as opposed to proofs within the system, are mostly done informally with a pen and paper. Yet the meta-theory of deductive systems is an area which would obviously benefit from machine support for formal proof. Is the software currently available sufficiently powerful yet easy enough to use to make machine assistance for formal meta-theory a viable proposition? This thesis presents work done by the author on formalizing proof theory from [DP97a] in various formal systems: SEQUEL [Tar93, Tar97], Isabelle [Pau94] and Coq [BB+96]. SEQUEL and Isabelle were found to be difficult to use for this type of work. In particular, the lack of automated production of induction principles in SEQUEL and Isabelle undermined confidence in the resulting formal proofs. Coq was found to be suitable for the formalisation methodology first chosen: the use of nameless dummy variables (de Bruijn indices) as pioneered in [dB72]. A second approach (inspired by the work of McKinna and Pollack [vBJMR94, MP97]) formalising named variables was also the subject of some initial work, and a comparison of these two approaches is presented. The formalisation was restricted to the implicational fragment of propositional logic. The informal theory has been extended to cover full propositional logic by Dyckhoff and Pinto, and extension of the formalisation using de Bruijn indices would appear to present few difficulties. An overview of other work in this area, in terms of both the tools and formalisation methods, is also presented. The theory formalised differs from other such work in that other formalisations have involved only one calculus. [DP97a] involves the relationships between three different calculi. There is consequently a much greater requirement for equality reasoning in the formalisation. It is concluded that a formalisation of any significance is still difficult, particularly one involving multiple calculi. No tools currently exist that allow for the easy representation of even quite simple systems in a way that fits human intuitions while still allowing for automatic derivation of induction principles. New work on integrating higher order abstract syntax and induction may be the way forward, although such work is still in the early stages.
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17

Garagić, Denis. "Contouring control of Stewart platform based machine tools /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486402288261907.

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Postlethwaite, Scott R. "Electronic based accuracy enhancement of CNC machine tools." Thesis, University of Huddersfield, 1992. http://eprints.hud.ac.uk/id/eprint/4663/.

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The need for better machine tool accuracy is discussed together with the factors which can affect machine tool accuracy. A study is made of the various techniques adopted for the reduction of errors in machine tools. The concept of error compensation is discussed and the different techniques for error compensation are appraised. A critical appraisal is presented of the work undertaken to date in the field of error compensation. Based on this appraisal a criterion is established for a universally applicable error compensation system. The development of a novel, patented microprocessor based machine tool error compensation system which fulfills this criterion is described. This compensation system, which is based on the precalibrated compensation technique, utilizes a unique geometric compensation algorithm. This algorithm allows the compensation system to compensate for the geometric error components of any machine tool configuration up to three axes. The development of this geometric algorithm is presented. The integration of this compensation system to a large moving column milling machine is described. Measurement tests and cutting tests were performed on this milling machine to establish the effectiveness of the compensation system. The results from these experimental tests are presented, and illustrate the significant improvement in machine tool accuracy achieved through error compensation. This is the first attempt at producing a machine tool error compensation system with universal applicability, both in terms of the machine geometric model, and the method of applying the compensation to the machine tool. The error compensation system developed gives the potential for compensating for thermally induced and load induced position errors, and will enable further work in this area to be commercially exploited.
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Chen, Fan. "Active damping of machine tools with magnetic actuators." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/51547.

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Flexible parts and tools are often found in machining operations, such as boring large cylinders, or turning long and slender shafts. The excessive flexibility of such tool or shaft may cause static deflection, forced vibration, and even chatter vibrations, which result in poor surface finish, tool breakage, and even damage to the machine, and thus become the main constraints in achieving higher productivity. This thesis presents an active damping solution to such problems, by using a novel three degrees of freedom linear magnetic actuator, which can increase the damping and stiffness of flexible structures in machining. The actuator is comprised of four identical magnetic actuating units; the magnetic force output of each actuating unit is linearized with regard to the input current by biasing magnets. Fiber optic sensors are integrated into the actuator to measure the displacements of the structure during machining. The magnetic actuator is used for three purposes: active damping of boring bar, increasing its static stiffness, and monitoring cutting forces based on the control current signals and fiber optic displacement sensor signals. The active damping is achieved by controlling the magnetic force as a function of measured vibrations. Three different types of controllers (loop shaping controller, Derivative-Integral controller, and H∞ controllers) have been developed to actively damp the displacements of a flexible boring bar during machining tests. The actuator can deliver 248 N force up to 850 Hz, and 107 N force up to 2000 Hz which is limited by the current amplifier used in the experimental setup. The cutting force is estimated through a Kalman filter, which was experimentally verified to be effective up to 550 Hz. Both the dynamic stiffness and static stiffness of the boring bar have been increased considerably with the designed magnetic actuator, leading to a significant increase in the chatter-free material removal rates. Although the proposed magnetic actuator is demonstrated for active damping of a slender boring bar in the thesis, the proposed magnetic actuator principle can be applied to suppress vibrations of rotating shafts, long boring bars and flexible structures in machine tools and other machineries.<br>Applied Science, Faculty of<br>Mechanical Engineering, Department of<br>Graduate
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Wiggins, John Sterling. "Design and specification of a PC-based, open architecture environment controller." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17299.

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21

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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Fleisig, Robert V. "Motion command generation for multi-axis machining /." *McMaster only, 2000.

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23

El-Mounayri, Hazim A. "Generic solid modelling based machining process simulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ30083.pdf.

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Wong, Wing-yiu. "An octree and face oriented approach for NC machining /." [Hong Kong : University of Hong Kong], 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12385852.

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25

Olson, Kevin. "Set up reduction and standardization for computer numerical control pulley cell at West Industries, Inc." Online version, 1998. http://www.uwstout.edu/lib/thesis/1998/1998olsonk.pdf.

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Sievert, Marilyn Kay. "In-house certification CNC training and certification /." Online version, 1999. http://www.uwstout.edu/lib/thesis/1999/1999sievertm.pdf.

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Mostert, Pierre Frans. "Computer numerical controlled drilling machine interfaced to a computer aided design package." Thesis, [S.l. : s.n.], 1996. http://dk.cput.ac.za/cgi/viewcontent.cgi?article=1058&context=td_ptech.

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28

Quesada, Robert E. "Alternative assessment of computer numerical control (CNC) machine tool students." Online version, 1999. http://www.uwstout.edu/lib/thesis/1999/1999quesada.pdf.

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29

Moscrop, Jeffrey William. "Modelling, analysis and control of linear feed axes in precision machine tools." Access electronically, 2008. http://ro.uow.edu.au/theses/27.

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30

Stander, Cornelius Johannes. "The passive control of machine tool vibration with a piezoelectric actuator." Diss., University of Pretoria, 2000. http://hdl.handle.net/2263/23038.

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Please read the abstract in the section 00front of this document<br>Dissertation (M Eng (Mechanical Engineering))--University of Pretoria, 2000.<br>Mechanical and Aeronautical Engineering<br>unrestricted
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31

Benner, Peter, Thomas Bonin, Heike Faßbender, Jens Saak, Andreas Soppa, and Michael Zaeh. "Novel Model Reduction Techniques for Control of Machine Tools." Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200901837.

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Computational methods for reducing the complexity of Finite Element (FE) models in structural dynamics are usually based on modal analysis. Classical approaches such as modal truncation, static condensation (Craig-Bampton, Guyan), and component mode synthesis (CMS) are available in many CAE tools such as ANSYS. In other disciplines, different techniques for Model Order Reduction (MOR) have been developed in the previous 2 decades. Krylov subspace methods are one possible choice and often lead to much smaller models than modal truncation methods given the same prescribed tolerance threshold. They have become available to ANSYS users through the tool mor4ansys. A disadvantage is that neither modal truncation nor CMS nor Krylov subspace methods preserve properties important to control design. System-theoretic methods like balanced truncation approximation (BTA), on the other hand, are directed towards reduced-order models for use in closed-loop control. So far, these methods are considered to be too expensive for large-scale structural models. We show that recent algorithmic advantages lead to MOR methods that are applicable to FE models in structural dynamics and that can easily be integrated into CAE software. We will demonstrate the efficiency of the proposed MOR method based on BTA using a control system including as plant the FE model of a machine tool.
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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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Hardy, Martin Charles. "Control logic evaluation of bespoke computer controlled machine tools." Thesis, University of Huddersfield, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359143.

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34

Nordin, Alexander Friedrich. "End to end machine learning workflow using automation tools." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119776.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 79-80).<br>We have developed an open source library named Trane and integrated it with two open source libraries to build an end-to-end machine learning workflow that can facilitate rapid development of machine learning models. The three components of this workflow are Trane, Featuretools and ATM. Trane enumerates tens of prediction problems relevant to any dataset using the meta information about the data. Furthermore, Trane generates training examples required for training machine learning models. Featuretools is an open-source software for automatically generating features from a dataset. Auto Tune Models (ATM), an open source library, performs a high throughput search over modeling options to find the best modeling technique for a problem. We show the capability of these three tools and highlight the open-source development of Trane.<br>by Alexander Friedrich Nordin.<br>M. Eng.
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Jalali, Mana. "Voltage Regulation of Smart Grids using Machine Learning Tools." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/95962.

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Smart inverters have been considered the primary fast solution for voltage regulation in power distribution systems. Optimizing the coordination between inverters can be computationally challenging. Reactive power control using fixed local rules have been shown to be subpar. Here, nonlinear inverter control rules are proposed by leveraging machine learning tools. The designed control rules can be expressed by a set of coefficients. These control rules can be nonlinear functions of both remote and local inputs. The proposed control rules are designed to jointly minimize the voltage deviation across buses. By using the support vector machines, control rules with sparse representations are obtained which decrease the communication between the operator and the inverters. The designed control rules are tested under different grid conditions and compared with other reactive power control schemes. The results show promising performance.<br>With advent of renewable energies into the power systems, innovative and automatic monitoring and control techniques are required. More specifically, voltage regulation for distribution grids with solar generation is a can be a challenging task. Moreover, due to frequency and intensity of the voltage changes, traditional utility-owned voltage regulation equipment are not useful in long term. On the other hand, smart inverters installed with solar panels can be used for regulating the voltage. Smart inverters can be programmed to inject or absorb reactive power which directly influences the voltage. Utility can monitor, control and sync the inverters across the grid to maintain the voltage within the desired limits. Machine learning and optimization techniques can be applied for automation of voltage regulation in smart grids using the smart inverters installed with solar panels. In this work, voltage regulation is addressed by reactive power control.
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Tsai, Chien-An, and 蔡建安. "Dynamic characteristics of machine tools." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/57688953798331902023.

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碩士<br>國立中興大學<br>機械工程學系所<br>96<br>High speed and high precision features have become focal points in the development of machine tools in recent years. The appeals in high speed and high precision features have greatly contributed to the demand for high rigidity and stability characters of the machine tool mechanism. The precision and lifetime of machine tools are not only the key but also the core in the in-depth technology. Vibration is the main factor in the determination of precision of machine tools. This study works on the dynamic characters of major five casting objects on machine tools made in Taiwan and Europe respectively. Firstly, we make two integrated processing machines under different structure and bound. The next step is to analyze the natural frequency and modal shapes of the machine tools by the finite element analysis. Measuring the natural frequency by spectrum analyzer based on the analysis modal chart in the third step. Study shows that finite element analysis has high correspondence with experimental results. Accordingly, by the modal test, we can understand dynamic characters of machine tools and experimental way to build up dynamic analysis process of machine tools and related technology. It can help to precisely understand the dynamic character of machine tools mechanism to ensure the feasibility of the design and try another improved schemes to improve precision and lifetime of machine tools.
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Liu, Shih-His, and 劉世喜. "Study of Error Measurement and Compensation Systems for CNC Machine Tools and Micro Machine Tools." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/92866931650314102446.

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碩士<br>中原大學<br>機械工程研究所<br>99<br>For general CNC machine tools, the volumetric error measurement and compensation can further enhance its machining accuracy without increasing manufacturing cost. According to the manufacturing demand of miniature parts, the non-MENS micro machining technology with characteristics of ultra-high accuracy and small workspace, also needs error measurement and compensation technology to improve its machining performance. However, due to the limitation of workspace of micro machine tools, the current measurement method currently used in industry cannot be applied. In this study, the volumetric error measurement and compensation method for general CNC machine tools and the machining error measurement and compensation method for micro machine tools were developed. For general CNC machine tools, with use of Single Socket Method and Element free method a complete system with friendly human-machine interface that can perform error measurement, prediction, and compensation was developed. For micro machine tools, with use of image filtering, edge identification, coordinates transformation, and image comparison method, an error measurement system which can on-machine inspect the machining error directly from the workpiece was developed, and an automatic NC-code identification/rewriting system was also developed for generating the error-compensated NC codes for production. The proposed method resolves the drawback of the previous method developed by our lab which cannot measure the errors of contours with different heights. Besides, a new image comparison method which provides better computation efficiency was also proposed. The experimental results have shown that the proposed method can further improve machining accuracy 62.7% for a CNC machine tool, and 52.3% for a micro machining tool.
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ji, sun-hui, and 紀孫煇. "Inertia Identification of Parallel Machine Tools." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/64034136052904363145.

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碩士<br>大葉大學<br>機電自動化研究所碩士班<br>95<br>Parallel machine tools have characteristics of high static rigidity, high performance control etc. Therefore, parallel machine tools have become a new machine tool in next generation. In order to precision simulate dynamic response with variational loads and uncertain inertia, detailed equations of motion are required. Consequently, this paper presents a dynamic equations using Lagrange’s equation in quasi-coordinates based on Stewart parallel mechanism. Then, mass and inertia are identified using the minimum position errors and velocity errors on legs based on the particle swarm optimization algorithm.
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Lin, Yu-Tseng, and 林祐增. "Construction of Human-Machine Interface for PC-Based Machine Tools." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/7bvtx5.

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碩士<br>國立虎尾科技大學<br>機械與機電工程研究所<br>99<br>Riding the tide of the rapid advances in technology in all industries, the automation industry, in particular, has been developing precision machinery with PC-Based controllers at a striking speed. Those PC-based machines provide humanized interfaces, unique functionality, and the independent capacity. They have helped organizations in increasing product diversity and in improving value-added to products processed by them. This trend has an overall impact on the machinery industry. This research is rooted on the simplified PC-Based Controller (INCON-M450S controller) developed by INTEK Company. Based on the INCON-M450S controller prototype, this research uses Visual C++ 2005 MFC framework to create a human-machine interface, which includes elements such as parameter adjustment, timing control, and content control. The resulting humanized, professional, and intelligent CNC control interface helps resolving some CNC related technical issues. Furthermore, it can assist the precision machinery industry in training and developing human capital.
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KAO, KUEI-CHANG, and 高桂樟. "The Study of Machine Tools Assembling Improvement –Case study of two speed gearbox assembly in machine tools." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/64145573414889782504.

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碩士<br>國立勤益科技大學<br>研發科技與資訊管理研究所<br>101<br>Taiwan machine tool industry in both production value and export value, play a vital role in the world. The manufactory assembling quality is especially the key factory. As the result of some losses caused from the poor assembling quality, visible losses like compensation of service parts, personnel cost of dispatching service staffs and even machine returned; invisible losses like good will, enterprise image damaged, market share declined and even prohibit selling from some specific areas, etc… Those losses are hard to be estimated. In order to reduce the company's losses, enhance the competitiveness of enterprises and revenue, by enhancing the quality of the machine tool assembling is the most direct way. This study is based on improving the assembling quality of machine tool and gear box to find out the analysis and evaluation from the failure factor through the analysis tool of project risk management, produce the engineering parameters of TRIZ, then use TRIZ “contradiction matrix” to extract the inventive principles, and accordingly figure out the relative improvement on assembling, then have these measures verified through the practical assembling and test run, which can be used as the gearbox assembling SOP for the manufactory. After factory test run and the customer usage to verify this improvement proposal is helpful to reduce the customer complaint and avoid the unnecessary cost and labor fee. The improvement technique and the procedure in this study can be constructed as the standard structure for various types of gearbox assembling.
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41

Vuza, Simo S. "A systematic approach in product development of industrial processing equipment." Thesis, 2013. http://hdl.handle.net/10210/8689.

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M.Phil. (Electrical & Electronic Engineering Science)<br>The need to industrialise South Africa has been an effort of government to increase manufacturing and Gross Domestic Products (GDP) while also creating decent work. Manufacturing industry has been striking with organisations closing and moving. Organisations have been established and fail to compete in the market due to lack of expertise to produce products that meet the customer`s requirements. Due to the opportunities of industrialisation in Africa the focus to develop equipment for these industries is necessary. This research objective is to develop a Systematic Approach of Product Development for Industrial Processing Equipment manufacturers that supply various organisations. The research will respond to the following question while also defining the development process:-  Will product development be helpful in industrialising South Africa and building sustainable manufacturing businesses?  Define a process feedback diagram of a systematic approach of product development to be used by industrial processing equipment? The research is done with the use of literature review form published sources which is validated by survey questions that were sent to sustainable successful organizations that supply industrial equipment. The research finding demonstrates the success phases and steps to be followed when developing product. The phases and their steps are;- 1. Marketing phase stages are Identifying Market Opportunities, Evaluating Potential Markets, Identifying Customer`s Needs and Product specification 2. Concept Development phase stages are system engineering for requirements identification & allocations, Internal & external Search of solution, concept selection and concept testing 3. System Level Design phase stages is Product Architecture 4. Detailed Design Phase stages are industrial design and design for manufacturing 5. Refinement and testing phase stages are designing for reliability, prototyping and testing. These are the phases the research focused on. The Survey revealed that success sustainable organisation have been using product development, marketing and system engineering methodologies as one of their common weapon to stay in business and grow in today’s competitive market place. This systematic approach process feedback diagram in product development has a lot of phase overlap. All phases interact even though there is still a feed process from one phase to the next. The process happens concurrently to ensure that all stages are considered at an earlier stage
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Wu, Kuo-pin, and 吳國賓. "The Improvement of Chatter in Machine Tools." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/07223967315097882298.

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43

Huang, Chih-Hung, and 黃志宏. "The Feedrate Control of CNC Machine Tools." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/08611573260080328024.

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碩士<br>國立中央大學<br>機械工程研究所<br>90<br>As CNC machine tools industry developed vigorously, not only CNC machine tools needed to promote working quality with regard to CNC machine tools, but also to pay much attention to working speed. The major function of the CNC interpolator is to send accurate motion commands to servo-controllers. Since the computational power of microprocessors has been significantly improved in recent years, today''s CNC interpolators can provide accurate motion commands and the look-ahead function for real-time accelerating and decelerating motion along a trajectory. This improvement makes the machine motion smooth in combination with the advanced motion control algorithm for high accurate machining. This thesis starts with a review on different currently available architectures and algorithms of acceleration and deceleration interpolation. The emphasis is placed on analyzing the contour error caused by different types of acceleration and deceleration interpolation algorithms. Considering the planning of speed curves within every two consecutive blocks together, we also develop several kinds of blended feedrate curves. The performances of different blended curves are compared in the view of corner error. A corner error control strategy is also developed by adjusting the continuous acceleration and deceleration curve between two consecutive blocks. After the contour error analysis, a real-time interpolator method with the Look-Ahead function is proposed. The new blended feedrate method is based on the principle of minimizing a specified maximum contour error. Experimental studies have been performed to verify the feasibility of the algorithms.
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44

Di, Corpo Jeffrey. "Predictive monitoring for metal cutting machine tools." 1990. http://catalog.hathitrust.org/api/volumes/oclc/23037426.html.

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45

潘嘉修. "Design and Analysis of the Machine Tools." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/02833247433535004237.

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碩士<br>國立彰化師範大學<br>機電工程學系<br>102<br>The key technologies to the development of machining tool consist in high loading capacity, high rigid structure and precise assembly skills. Among those, a crucial feature is its low friction and high damping under high loading capacity. Since the technology of hydrostatic system meets the requirements aforementioned, it becomes essential in the development of machining tool. The hydrostatic guiding system with a high loading capacity is equipped with several oil grooves; however, the system is not stable enough to support the high loading with only one hydraulic facility. Therefore, we use the oil supply system with multiport oil pumps to offer the grooves simultaneously and to keep the oil flow stable. In this study we propose the design and analysis of hydrostatic guide way with constant flow. The original design of box way structure guide way is replaced by the hydrostatic guide way. Then, the characteristics of the multiport pump and the flow meter are tested to ensure the reliability and stability. After checking the performance of the guide way, we use engineering calculation and correction to obtain the behavior of hydrostatic guide way with loads as a basis for further adjustments.
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Chern, Jeeng-Jong, and 陳拯中. "Analysis and Control of Hexaglide Machine Tools." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/55891264062829385580.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>89<br>This paper presents a systematic analysis for Hexaglide machine tools; including the analysis of kinematics, dynamics, workspace, singularity and control laws, respectively. The kinematics, inverse kinematics and dynamics model of Hexaglide machine tools are derived with the help of Matlab and Simulink software. In analyses of workspace and singular configuration, the paper determines the workspace of Hexaglide machine tool by computing the inverse kinematics equations, with the following constraints: the moving limitations, the mechanism non-interfering region and the continuous non-singular region. The phenomena of singular configuration of this mechanism are analyzed by using the Jacobian matrix relationships between the linear sliders and the motion platform. In this paper, the NURBS trajectory planning is adopted in Hexaglide machine tool. The servo design of the motion platform is implemented with the parameters observer, the feed-forward dynamic compensation and the feedback PID control. From the results of computer simulations, the system parameters can be actually estimated using the parameters observer. The system parameters are used in the calculations of the inverse kinematics feed-forward compensation of the motion platform. The comparisons with compensation or not are also discussed. The results show that the compensated system has better tracking performance whatever in rotating or translating cases. Using the presented method, indeed, the machine tool can achieve high speed and high accuracy control performance.
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47

謝良宗. "Inverse Displacement Analysis of TRIPOD Machine Tools." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/58547865391090496418.

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碩士<br>國立中正大學<br>機械系<br>89<br>In this thesis I would like to focus discussions on inverse displacement analysis problem of the TRIPOD machine tools. Ways to derive the model of the new type mechanism, to solve the nonlinear equations and to probe into the special meaning of the found roots, will be examined carefully and thoroughly in this paper. An attempt to work out on the relating kinematics simulation will be made in the conclusion session. The thesis will show the analysis of both 3UPS-RRP/RR and 3UPRR/RR these two types. The part of 3UPS-RRP/RR analyzing is in Chapter 3. I will explain using the constrained-linkage of the machine, and an inverse way from cutting edge to the center of moving platform can help find out the analytical solution of 3UPS-RRP/RR type. From this it revealed the fact that usually there are 8 mathematical roots existing. However, there are only two that really work. These two can be seen as one if analyzed in application of Physics, and it is assumed that there is only one solution in 3UPS-RRP/RR type. The part of 3UPRR/RR analyzing is in Chapter 4. From the defined systematical model, there has been found in this work that the constrained equations of the 3UPRR/RR type. Here I use numerical method to approach and to find the roots. Normally we could get 16 mathematical roots, but only 6 roots are accepted when Physics is applied. In conclusion, practically there would be only 4 solutions that can be used as they are suggested in this thesis.
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Sung, Richard, and 宋孟沛. "Positioning Error Compensation for Hexapod Machine Tools." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/52195298398599065559.

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Ko, Che-kai, and 柯哲楷. "Development of a State Analytic Tool for Cutting Tools of Machine Tools." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/08219620188482420067.

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碩士<br>國立高雄第一科技大學<br>電機工程研究所碩士班<br>102<br>The states of tool wear dominate machining accuracy of turning processes. Without timely changing worn tools, the produced workpieces could be over tolerances leading to the used machining resources being wasted. Capability of evaluating tool wear for changing worn tools can improve overall machine efficiency. The search proposes a tool state analysis service (TSAS) to estimate tool availability. In feature analysis, signals of spindle vibration and motor current in machining are collected and transformed to features including time, frequency, and time-frequency domains. In feature selection, key machining features for indicating tool states are selected by using the non-dominated sorted genetic algorithm-II (NSGA-II) and relative coefficients. For tool evaluation, the key features are inputted into a back propagation neural networks model to estimate the tool wear state, which then can be used to evaluate machining accuracy. In results, 60 standard workpieces were experimented in a 3-axes CNC machine center by five conditions covering different materials, spindle speeds, feed rates, and reserved sizes. By using the proposed service, the average absolute errors of predicting tool wear 16%. Finally, generic of the proposed service was tested and demonstrated by experiments using a CNC lathe.
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Chan, Shih-Lang, and 詹世朗. "System design of an intelligent Human-Machine Interface on NC machine tools." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/13941083524194010235.

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碩士<br>國立高雄應用科技大學<br>模具工程系碩士班<br>93<br>Currently in the drastic competitive era for the Machine tool industry, the demand towards multi-function development such as function integration, specialization, high speed, and lightweight has been inevitable trend. That is to say, multifunctional intelligent machine tool is the trend in the future to enhance the product value. The objective of research is to integrate the CAM (Computer Aided Manufacture) function with the human machine interface (HMI) of the machine tool via the development of an intelligent machine HMI that has 2-1/2 axis (2.5D) capability. The Microsoft Windows-Based were adopted as the development platform. The pocket machining function in this research was developed through the contour offset algorithm based on the proposed new adjacent pair-intersection method. The color-filling notion was used to decide if there were removable over-cutting loop firstly; tool path planning was then followed. The representation of sequence tree was applied in tool path planning and independent machining loop was merged by using its hierarchical relations so as to generate the comprehensive tool path. An integrated pocketing loop was defined in this research based on the common G code to ease the programming for the used to create machining cycle. The Unified Modeling Language (UML) was utilized in the development of the HMI system for the system function analysis and planning so as to create the HMI that can satisfy the user’s need. The CAM kernel module was then integrated finally into the HMI to accomplish the intelligent NC machine tool HMI system design and implementation of Cam module. With the developed intelligent NC machine tool HMI system, a user can input directly a general profile containing islands (in DXF format) or the proposed G code-based pocketing program parametrically, and the machining tool path can be immediately displayed and simulated for real machining. The developed methodology has been tested and implemented successfully for reliable application.
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