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Dissertations / Theses on the topic 'Machining tools'

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Published: 4 June 2021

Last updated: 19 June 2025

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1

Bajalan, M. R. "Machining of steels with ceramic tools." Thesis, University of Warwick, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357239.

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2

Kordonowy, David N. (David Nathaniel) 1981. "A power assessment of machining tools." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/31108.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.<br>Includes bibliographical references (p. 75-76).<br>Energy conservation is becoming a more important ideal in today's society, due to the increasing awareness of environmental and economic impacts. This project experimentally measures the power consumption, which is related to the energy consumption, of machines in the Laboratory for Manufacturing and Productivity, in order to determine the energy cost of the machines. This project then compares the results found experimentally to the theoretical minimum energy consumption in order to reference the measurements to the ideal energy consumption. Finally, this project attempts to find documentation of these energy costs in order to project the results found experimentally onto machines not physically available for measurement. This project found that the machines in the Laboratory for Manufacturing and Productivity used more energy than was necessary while running, due to the sometimes large amount of power needed to run the idle machines. The specifications given by the machine's manufacturers were adequate to estimate the maximum power requirements. Combining these estimates with the motor properties allowed one to estimate the power requirements of both unloaded operation (while the machine was idle) as well as loaded operation.<br>by David N. Kordonowy.<br>S.B.

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3

Ren, Xuejun. "The tool : workpiece interaction when machining welded hardfacing using PCBN tools." Thesis, University of Hull, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397061.

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4

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

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5

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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6

Mahmoud, El-Amin A. "Machining with titanium nitride-coated metal tools." Thesis, Aston University, 1988. http://publications.aston.ac.uk/11912/.

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7

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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8

Khamsehzadeh, Houshang. "Behaviour of ceramic cutting tools when machining superalloys." Thesis, Online version, 1991. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.293915.

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9

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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10

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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11

Song, Sukhan. "Intelligent machining control for turning process /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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12

Bailey, Trevor Eric. "Generic mechanistic modeling for multi-axis machining /." *McMaster only, 2001.

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13

Negishi, Nobuhiko. "Elliptical Vibration Assisted Machining with Single Crystal Diamond Tools." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-08292003-175201/.

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Optical quality surfaces on non-ferrous materials are commonly produced with single crystal diamond tools and precision turning machines. To add ferrous and brittle materials to the list of diamond turnable materials, a process know as elliptical vibration assisted machining (EVAM) has been developed. EVAM combines a small, less than 50 &#181m size, oscillatory tool path to the linear motion of standard orthogonal cutting. EVAM reduces cutting forces and tool wear by reducing chip thickness and bringing the tool tip out of contact with the workpiece 75% of the time. These characteristics may increase tool life and work piece material compatibility with single crystal diamond tools. A non-resonant piezo electric stack driven tool actuator was designed and built for a large range of operating frequencies (0-5KHz) and tool path dimensional flexibility (ellipse motion up to 50 x 9 &#181m). The diamond tool is mounted to a kinematic linkage. Finite element analysis (FEA) was used to aid the design of a light weight, high stiffness tool holder/kinematic linkage for high frequency operation. The effects of heat generation caused by high voltage, high frequency operation of piezo stacks were simulated using FEA and finite difference programs. These simulations were used to design and develop an efficient active cooling system. Tool path geometry and its effects on sliding distance, chip geometry, and surface finish were modeled with Maple software. Calculated chip geometry was successfully used to predict cutting and thrust forces. Force predictions were compared with measured forces for 6061 aluminum. A method generated for precision contour grinding was implemented to accurately predict theoretical surface roughness for EVAM machined surfaces. EVAM machining tests with brittle workpiece materials, such as silicon carbide, produced optical quality surfaces.

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14

Teltz, Richard W. "Open architecture control for intelligent machining systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0006/NQ42883.pdf.

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15

Lau, Pak Fai. "CNC machining accuracy enhancement by tool path compensation method /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202005%20LAU.

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16

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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17

Oraby, Samy El-Sayed. "Mathematical modelling and in-process monitoring techniques for cutting tools." Thesis, University of Sheffield, 1989. http://etheses.whiterose.ac.uk/1814/.

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The need is expressed for mathematical models which describe the cutting tool-workpiece interaction and for accurate on-line monitoring of tool-state. These are essential requirements for the achievement of unmanned and computerized machining processes. Techniques are used to design the experiments which substantially reduce the number of tests while providing all the essential information for statistical analysis and for the development of mathematical models. The testing conditions are chosen to reasonably conform with the practical requirements. Multi-coated carbide tool inserts [Sandvik GC435] are used to cut an alloy steel [EN 19] under normal cutting conditions and for a wide range of operating parameters. An accurate and sensitive three-component dynamometer was designed, manufactured and used to measure the tool forces through a BBC microcomputer. Continuous records of the tool vibration have been collected in two different co-ordinate directions simultaneously together with measurements of tool wear and cutting forces. Linear and non-linear regression techniques are used to develop mathematical models for the experimentally measured responses: cutting forces, tool vibration, and tool wear. Special attention is devoted to the identification of the most appropriate models. Each model being capable of representing the tool state throughout its working lifetime. Tool life wear-based models are developed to relate the expected tool lifetime to the operating parameters: speed, feed, and depth of cut. A robust regression analysis technique, used in conjunction with iteratively re-weighting least-squares, has been found to improve the accuracy of the models, and to stabilize its computed residuals through the elimination of the effect of influential observations having high experimental error. Response surface methodology RSM has been used to signify the non-linear nature of tool life response. The force variation has been shown to correlate strongly with the wear progress so that it can be used for accurate in-process determination of tool wear and for monitoring tool state. It has been shown that the variation in the ratio between force components correlates with wear and is independent of the effect of other machining parameters; this enables the approach to be used for a wider range of materials and more extensive operational domain. Study of the power spectral analysis of the tool vibration indicates that among the tool's vibration modes, the first fundamental natural frequency of vibration in the feed direction exhibits a consistent correlation with wear-progress. The Vibration amplitude decreases with the increase of the wear level until it reaches a limit after which it tends to reverse its characteristic. The time at which the characteristic changes is found to closely correspond with the practical end of the tool lifetime. Based on this fact, an in-process approach is investigated to determine the tool life on-line. Also, a model has been developed for tool wear estimation based on a combination of vibration and force; and, very good agreement has been obtained with the experimental data. The validity of the models; their feasibility; and, their industrial significance are confirmed for adaptive control AC systems, and for machinability data base systems MDBS.

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18

Mathew, Ronnie A. M. S. "Study of the Pulsed Electrochemical Micromachining of Ultra High Aspect Ratio Micro Tools." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1299012683.

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19

Haron, Che Hassan Che. "Machining of titanium alloys with coated and uncoated carbide tools." Thesis, Coventry University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262998.

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20

Veldhuis, Stephen C. "Modelling and compensation of errors in five-axis machining /." *McMaster only, 1998.

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21

Reams, Michael Lee Anthony. "An expedient method for performance evaluation of machining fixtures." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/18925.

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22

黃永耀 and Wing-yiu Wong. "An octree and face oriented approach for NC machining." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B3120899X.

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23

Kulankara, Krishnakumar. "Machining fixture synthesis using the genetic algorithm." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16491.

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24

Dawson, Ty Grant. "Machining hardened steel with polycrystalline cubic boron nitride cutting tools." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17787.

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25

Fish, Randall K. "Dynamic models of machining vibrations, designed for classification of tool wear /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/6033.

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26

Becze, Charles Edward Elbestawi M. A. "A thermo-mechanical force model for machining hardened steel /." *McMaster only, 2002.

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27

Choy, Hang-shan, and 蔡恆生. "Tool path trajectory analysis and machining strategy for corneringcut." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31244117.

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28

Brown, Charles Jeremy. "An investigation of tool stresses caused by unsteady chip formations in machining." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236295.

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29

Stjernstoft, Tero. "Machining of Some Difficult-to-Cut Materials with Rotary Cutting Tools." Doctoral thesis, KTH, Production Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3693.

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<p>Automobile and aero industries have an increasing interestin materials with improved mechanical properties. However, manyof these new materials are classified as difficult-to-cut withconventional tools. It is obvious that tools, cutting processesand cutting models has to be devel-oped parallel to materialsscience. In this thesis rotary cutting tools are tested as analternative toexpensive diamond or cubic bore nitridetools.</p><p>Metal matrix composites mostly consist of a light metalalloy (such as aluminium or titanium) reinforced with hard andabrasive ceramic parti-cles or fibres. On machining, thereinforcement results in a high rate of tool wear. This is themain problem for the machining of MMCs. Many factors affect thelife length of a tool, i.e. matrix alloy, type, size andfraction of the reinforcement, heat treatment, cuttingconditions and tool properties.</p><p>In tests, the Al-SiC MMC formed a deformation layer duringmilling, probably affected by lack of cooling. The dominatingfactor for tool life was the cutting speed. Water jet or CO2cooling of turning did not provide dramatic increase in toollife. With PCD, cutting speeds up to 2000 m/min were usedwithout machining problems and BUE formation. Tool flank wearwas abrasive and crater wear created an "orange-peel type" wearsurface. PCD inserts did not show the typical increase in flankwear rate at the end of its lifetime.</p><p>The use of self-propelled rotary tools seems to be apromising way to increase tool life. No BUE was formed on therotary tool at high cutting data. The measurements indicatethat the rotary tool creates twice as good surface as PCDtools. The longest tool life was gained with an inclinationangle of 10 degrees. Tool costs per component will beapproximately the same, but rotary cutting tool allows higherfeeds and therefore a higher production rate and thus a lowerproduction cost.</p><p>The rotary cutting operation might have a potential toincrease productiv-ity in bar peeling. The lack of BUE withrotary cutting gives hope on higher tool life. The test resultsshow that tool wear was 27% lower with rotary cutting tools.Increase of cutting speed from 22 to 44 m/min did not affectcutting forces. This indicates that the cutting speed canincrease without significant change in tool wear rate.</p><p>Issues related to rotary cutting like cutting models,cutting processes, standards, tools and models have beendiscussed. A tool wear model with kinetic energy has beendiscussed.</p><p><b>KEYWORDS:</b>Difficult-to-Cut material, Metal MatrixComposite (MMC), Machining, Machinability, Rotary Cutting Tool,Acoustic Emission</p>

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30

Peng, Jie. "Design and analysis of a CNC system for machining and monitoring." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29730.

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The development of unmanned machining systems has been a recent focus of manufacturing research. Computer Numerical Control (CNC) units, which monitor and control many tightly coupled machining tasks, are inseparable parts of the unmanned manufacturing system. This thesis addresses the detailed design and analysis of a modular CNC system for a milling machine. The feed drive control system of the machine tool is thoroughly studied. The mathematical model for the feed drive control system, which consists of a motion controller, power amplifiers and DC-servo motors, is developed and experimentally verified. A method of estimating cutting forces from current drawn by feed drive motors is developed. The viability of the current sensor as a feeding-force sensing component is illustrated and experimentally tested on the milling machine. Successful application of the current sensor to tool breakage detection in milling operation is presented. The performance of the multi-axis contouring system in precision machining is discussed. The contouring errors induced by feed drive positioning systems in CNC machine tools is investigated using the state space model of the CNC system. The influence of the cutting force on the accuracy of machining is shown to be negligible for feed drives driven by ball leadscrews. Various control strategies for the improvement of machining accuracy are tested in the simulation studies.<br>Applied Science, Faculty of<br>Mechanical Engineering, Department of<br>Graduate

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31

Hurtado, José Francisco. "Experimental study of workpiece-fixture contact forces and friction during machining." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/16096.

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32

Hyde, Luke Justin. "Improvements in machine tools with respect to vibration damping : a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online version, 2007. http://proquest.umi.com/pqdweb?index=74&did=1445048001&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1255027505&clientId=28564.

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33

Tabani, Haroon R. "Application of NC machining of complex surfaces to streamlined extrusion dies." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182523937.

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34

Li, Kuan-Ming. "Predictive Modeling of Near Dry Machining: Mechanical Performance and Environmental Impact." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-05122006-143200/.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2007.<br>Dr. Liang, Steven Y., Committee Chair ; Dr. Melkote, Shreyes N., Committee Member ; Dr. Vengazhiyil, Roshan Joseph, Committee Member ; Dr. Zhou, Chen, Committee Member ; Dr. Zhou, Min, Committee Member.

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35

Chan, Tsz Lung. "Performance enhancement of machining process by an add-on online measurement system /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?IELM%202008%20CHAN.

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36

Li, Bo. "Analysis and synthesis of machining fixture-workpiece systems with multiple frictional contacts." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15956.

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37

Farley, Mark Harrison. "Predicting machining accuracy and duration of an NC mill by computer simulation." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/16499.

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38

Repo, Jari. "Condition monitoring of machine tools and machining processes using internal sensor signals." Licentiate thesis, KTH, Machine and Process Technology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12872.

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<p>Condition monitoring of critical machine tool components and machining processes is a key factor to increase the availability of the machine tool and achieving a more robust machining process. Failures in the machining process and machine tool components may also have negative effects on the final produced part. Instabilities in machining processes also shortens the life time of the cutting edges and machine tool.</p><p>The condition monitoring system may utilise information from several sources to facilitate the detection of instabilities in the machining process. To avoid additional complexity to the machining system the use of internal sensors is considered. The focus in this thesis has been to investigate if information related to the machining process can be extracted directly from the internal sensors of the machine tool.</p><p>The main contibutions of this work is a further understanding of the direct response from both linear and angular position encoders due the variations in the machining process. The analysis of the response from unbalance testing of turn tables and two types of milling processes, i.e. disc-milling and slot-milling, is presented. It is shown that operational frequencies, such as cutter frequency and tooth-passing frequency, can be extracted from both active and inactive machine axes, but the response from an active machine axis involves a more complex analysis. Various methods for the analysis of the responses in time domain, frequency domain and phase space are presented.</p><br>QC 20100518

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39

AbraÌƒo, Alexandre Mendes. "The machining of annealed and hardened steels using advanced ceramic cutting tools." Thesis, University of Birmingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249408.

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40

Onwuka, Goodness Raluchukwu. "Ultra-high precision grinding of BK7 glass." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/5203.

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With the increase in the application of ultra-precision manufactured parts and the absence of much participation of researchers in ultra-high precision grinding of optical glasses which has a high rate of demand in the industries, it becomes imperative to garner a full understanding of the production of these precision optics using the above-listed technology. Single point inclined axes grinding configuration and Box-Behnken experimental design was developed and applied to the ultra-high precision grinding of BK7 glass. A high sampling acoustic emission monitoring system was implemented to monitor the process. The research tends to monitor the ultra-high precision grinding of BK7 glass using acoustic emission which has proven to be an effective sensing technique to monitor grinding processes. Response surface methodology was adopted to analyze the effect of the interaction between the machining parameters: feed, speed, depth of cut and the generated surface roughness. Furthermore, back propagation Artificial Neural Network was also implemented through careful feature extraction and selection process. The proposed models are aimed at creating a database guide to the ultra-high precision grinding of precision optics.

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41

Dawood, Abdulhameed Alaa. "A Study on the Sustainable Machining of Titanium Alloy." TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1566.

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Titanium and its alloy (Ti-6Al-4V) are widely used in aerospace industries because of their light weight, high specific strength, and corrosion resistance. This study conducted a comparative experimental analysis of the machinability of Ti-6Al-4V for conventional flood coolant machining and sustainable dry machining. The effect of cutting speed, feed rate, and depth of cut on machining performance has been evaluated for both conditions. The machining time and surface roughness were found to be lower in dry machining compared to flood coolant machining. The tool wear was found to be unpredictable, and no significant difference was observed for dry and coolant machining. In a comparison of all the parameters, sustainable dry machining was found to provide better performance in machining Ti-6Al-4V. This study also investigated the machinability of Ti-6Al-4V using coated and uncoated tungsten carbide tools under dry conditions. Tool wear is a serious problem in the machining of titanium alloys in dry conditions. Heat dissipation from the toolworkpiece interface a difficult challenge in dry machining, resulting in the alloying of the workpiece to the tool surface. Dry machining with the coated tool was comparatively faster, and resulted in less tool wear than uncoated tools. Using the Titanium aluminum nitride TiAlN coated carbide tool during dry machining provided a smoother surface finish with lower average surface roughness. The conclusion, therefore, is that the tool coating was found to be effective for the dry machining of titanium alloys.

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42

Wang, Nan. "Tool path generation method for 5-axis NC machining with flat-end cutter /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?MECH%202009%20WANG.

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43

Hilding, Gustaf, and Kristoffer Ryytty. "Consumption-driven Inventory Control : A study of inventory management applied to machining tools." Thesis, KTH, Industriell produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174148.

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Within manufacturing industries, capital is tied up in machines, tools and inventory of unprocessed raw materials as well as finished goods and everything in between, also known as work in progress. Naturally, firms strive to minimize the capital employed in these items and thus facilitate a leaner operation. At the same time, it is important to maintain a stable and uninterrupted production. A prerequisite for maintaining a stable production is that the inputs of the production processes are available at all times. Machining tools need to always be available and easily accessible in order to minimize machine downtime in between batch orders, and if a machine breaks down, the necessary spare parts must be provided quickly. This study has been performed in order to investigate when it would be beneficial for a manufacturer of heavy vehicles to achieve a consumption-driven system for ordering machining tools. More specifically, it looks into the prerequisites and the potential benefits of such a system.This research has been done by conducting a case study at Scania Transmission Machining in Södertälje, Sweden, which is the department responsible for manufacturing conical gears and gear transmission components for Scania’s European production. The case study included a diagnosis of the current inventory control situation, which served the purpose of identifying weaknesses in the system and potential areas of improvement. Furthermore, simulations were conducted based on historical transaction data from the storage unit which supplies tools for the case company. This was done in order to investigate how a consumption-driven inventory control system may be set up in practice and to provide figures on potential monetary gains as well as other benefits.The findings from this study indicate that there are many incentives for Scania Transmission Machining to adopt and implement an inventory control system for machining tools which is based on the consumption. First off, the diagnosis of the current inventory control system revealed several weaknesses and inefficiencies in the system. Furthermore, simulating the inventory levels for a sample of tools showed improvements in terms of the number of days of shortage and in a lower average inventory level. Finally, the monetary savings have been estimated to amount to roughly 1 million SEK per year.<br>Inom tillverkande industri är kapital bundet i maskiner, verktyg och material av olika slag samt färdiga varor och allt däremellan, även kallat produkter i arbete. Företag strävar efter att minimera det uppbundna kapitalet i dessa enheter i syfte att få till stånd en kostnadseffektiv produktion. Samtidigt som man vill minska mängden uppbundet kapital är det viktigt att bibehålla en stabil produktion. En förutsättning för detta är att produktionsprocessernas råvaror och verktyg alltid finns tillgängliga. Skärande verktyg måste alltid finnas tillgängliga och lättåtkomliga för att minimera stilleståndstiden mellan produktionsordrar, och om en maskin går sönder måste de rätta reservdelarna kunna tillhandahållas snabbt. Den här studien har utförts för att undersöka när det skulle vara fördelaktigt för en tillverkare av tunga fordon att implementera ett förbrukningsstyrt system för beställning av skärande verktyg. Studien fokuserar mer specifikt på de förutsättningar som krävs för att ett förbrukningsstyrt system ska kunna implementeras och på de potentiella fördelarna med ett sådant system.En fallstudie har genomförts på Scania Transmission Machining i Södertälje, Sverige, den avdelning som tillverkar koniska växlar och andra transmissionskomponenter för Scanias europeiska produktion. I fallstudien ingår en diagnos av den aktuella lagerstyrningssituationen i syfte att identifiera svagheter i systemet och potentiella förbättringsområden. Vidare har simuleringar utförts, baserade på transaktioner från förrådsenheten som förser produktionen med verktyg. Detta syftade till att undersöka hur ett förbrukningsstyrt lagerstyrningssystem kan upprättas i praktiken och för att ta utreda vad vinningen i så fall skulle vara.Resultaten från studien visar att det finns många anledningar för Scania Transmission Machining att implementera ett förbrukningsstyrt lagerstyrningssystem för skärande verktyg. Först och främst avslöjade diagnosen av den aktuella lagerstyrningssituationen flertalet brister i systemet. Dessutom visade simuleringarna av verktygens lagernivåer på förbättringar när det gäller antalet dagar med brist och samtidigt en lägre genomsnittlig lagernivå. Slutligen har vinsten med att övergå till en förbrukningsstyrd modell uppskattats uppgå till ca 1 000 000 kronor.

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Du, Plessis Lukas Johannes. "Design and optimum operation of a re-configurable planar Gough-Stewart machining platform." Thesis, Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-10312005-140405/.

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Roberts, Bryndan. "Integration of an electrical discharge machining module onto a reconfigurable machine tool." Thesis, Nelson Mandela Metropolitan University, 2014. http://hdl.handle.net/10948/6182.

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Electrical Discharge Machining (EDM) is a non-contact manufacturing process in which material is removed from a metal workpiece by high frequency electrical pulses produced between an electrode and the workpiece. EDM machines are usually stand-alone devices, and are quite expensive. The objective of this research was to integrate an EDM machine and an existing reconfigurable CNC machine tool, using a modular approach, to enable conventional milling and EDM to be conducted in a co-ordinated fashion on the same machine tool.

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Atmadi, Alexander. "Cutting fluid aerosol from splash in turning : analysis for environmentally conscious machining." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19603.

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Wagner, Pinto Fábio. "An experimental and numerical approach to investigate the machining performance of engineered grinding tools /." Zürich : ETH/ IWF, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17666.

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Felhő, Csaba [Verfasser]. "Investigation of surface roughness in machining by single and multi-point tools / Csaba Felhö." Aachen : Shaker, 2014. http://d-nb.info/1060622963/34.

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Widiyarto, Muhammad Helmi Nur. "Modelling and passive correction investigation of vibration induced machining errors on CNC machine tools." Thesis, University of Huddersfield, 2006. http://eprints.hud.ac.uk/id/eprint/4748/.

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Machine tool vibration is a complex subject requiring a multi-disciplinary approach involving the identification and analysis of the vibration sources and characteristics, as well as its direct and indirect effects. Machine tool vibration is influenced and can be characterised by the machine's structural dynamics, the drive system performance and the cutting force generation. Its effect materialises in the form of poor surface finish of the workpiece, accelerated cuttingtool wear, and chatter during the machining process. This research project investigates vibration-induced errors on a Cincinnati Arrow 500 CNC vertical machining centre under dynamic conditions. Analyses and identifications of suitable experimental configurations for modal analysis and cutting process investigations are carried out to determine the most appropriate techniques for the aforementioned processes. The results are compiled into recommended metrology practices for determining the vibration modes. State-of-the-art practices are employed in the study to formulate and validate a machine tool axis drive model to examine the drive's individual element effects on the overall dynamic performance. The feasibility of an active control vibration technique employing the drive is also investigated. The hybrid modelling technique incorporating a new digital current control loop developed using the power system blockset and field-oriented control strategy was employed to construct the model. Analytical and experimental techniques for the validation of the digital drive system's position, velocity and current control loops utilising deterministic and non-deterministic signals from the internal machine drive system functions are also devised. The majority of machine tool vibration is generated while the machining process is taking place. Thus, the analysis and in-depth study of the machining process plays an important role in the investigation of machine tool vibration. In this study, vibration models of the cutting tool and workpiece are formulated and incorporated with an advanced cutting force generation model to create a machining process model constructed as part of an EPSRC project collaboration. The model is validated using various machining process conditions and correlated with the workpiece surface finish analysed using state-of-the-art 3D surface topography technique to identify salient vibration effects. In this study, a model of the machine structural dynamics is constructed using the Finite Element Method (FEM) for the comprehensive analytical investigation of the machine vibration behaviour accurately. The analytical model is validated against the measured results from the experimental modal analysis investigation obtained using the appropriate technique. Correlation analysis of the simulated and experimental modal analysis results is performed in order to improve the accuracy of the model and minimise modelling practice errors. The resulting optimised model then undergoes sensitivity analysis through parametric structural analysis and characterisation technique in order to identify potential vibration reduction technique by the passive methods.

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Taylor, Ciaran John. "The wear and performance characteristics of PCBN cutting tools when machining D3 hardened steel." Thesis, University of Hull, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431046.

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