Dissertations / Theses on the topic 'Mechanical grinding'
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Brown, Austin (Austin R. ). "Axially force limited grinding spindle for robotic grinding." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119966.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 35).
Grinding and Polishing of small parts is often easily performed by human hands, yet is challenging to automate. The grinding and polishing process is best done using a force-control scheme, which human hands perform naturally. Heavy robotic arms, which favor a position-control scheme, are difficult to control precisely, and trajectory errors can cause excessive grinding force which leads to burning of the part or destruction of the grinding wheel. Prior art of direct force control on a large robot arm requires the end-effector to have a 6-axis dynamometer, which is unwieldy, costly, and greatly limits the speed/precision of the process. We will discuss a new type of grinding spindle which is axially compliant, allowing the position-control robot arm to be used in a force-control nature. The spindle has a disjoint force-displacement curve, effectively operating in two modes: position-control mode at first, until a critical force is exceeded, when the spindle transitions into force-mode, keeping constant grinding force on the part though a certain range of travel. This limits the amount of force which can be imparted during grinding to a safe amount. The spindle is very simple and mechanically robust. We have built this hybrid position-force control spindle and tested it. The spindle was shown to perform correctly and successfully completed the test grind.
by Austin Brown.
S.B.
Curtis, David Thomas. "Point grinding and electrolytic point grinding of Udimet 720." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/2850/.
Levert, Joseph Albert. "Interface mechanics of chemical mechanical polishing for integrated circuit planarization." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/15914.
Svensson, Dennis, and Svärd Tobias Falk. "Mechanical dry grinding process of saw chain." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-39927.
Baniszewski, Beth (Beth Ellen). "An environmental impact analysis of grinding." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32880.
Includes bibliographical references (leaves 39-40).
This thesis was intended to investigate the environmental impact of grinding in the United States manufacturing industry. Grinding is an ideal method for producing parts with a fine surface finish and high dimensional accuracy and for shaping hard or brittle workpieces. There are a wide variety of different types of grinding machines, each with different applications and slightly different energy requirements. Workpieces are generally flooded with a stream of coolant while being ground or placed in a spray of coolant mist. Coolant recycling systems are used to filter ground off chips out of coolant and to remove foreign oils and bacteria which pose health hazards. Oil mist collectors both clean mist coolant and prevent the toxic coolant from being inhaled by machinists. In total, 63 *10¹⁵ joules of energy are consumed per year by grinding in manufacturing, 57% of which is directly used in material removal. A total of 1.5*10¹⁰ pounds of scrap chips, spent grinding wheels, and used filters are produced each year as a result of grinding, over 99% of that being scrap chips. About 2.3 million gallons of fluids per year of grinding fluids are incinerated. Grinding creates a significant environmental footprint, creating a need for methods to reduce energy use in grinding and for ways to recycle solid waste that would otherwise be sent to landfills or incinerated.
by Beth Baniszewski.
S.B.
Zhang, Xiaohong. "Chemical mechanical polishing and grinding of silicon wafers." Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/475.
Brown, Matthew Lasché. "Intelligent robot grinding : planning, optimization, and control." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14552.
Ebbrell, Stephen. "Process requirements for precision grinding." Thesis, Liverpool John Moores University, 2003. http://researchonline.ljmu.ac.uk/5633/.
Scagnetti, Paul Albert. "Design of an industrial precision ceramic grinding machine." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10918.
Shan, Lei. "Mechanical interactions at the interface of chemical mechanical polishing." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17774.
Agarwal, Reena. "Degradation of polymers in chemical mechanical polishing." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/11828.
Yin, Guoxu. "Theoretical-Experimental Study of Fluid Delivery and Heat Management in Grinding." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1438598110.
Goldfine, Neil. "Process analysis and design for grinding robot tool holders." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/91315.
Charmley, James E. (James Edward). "Geometric and dynamic analysis of shoe-type centerless grinding." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/43242.
Tate, Allan Robert. "Closed loop force control for a robotic grinding system." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15031.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Bibliography: leaves 175-179.
by Allan Robert Tate.
M.S.
Mess, Francis McCarthy. "Wear model for chemo-mechanical polishing of single crystal silicon." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/15984.
Taylor, Andre D. "Chemical-mechanical planarization of lithium gallate." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/12375.
Bibler, Jared Evan. "Effects of imbalance and geometric error on precision grinding machines." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43428.
Moeller, Gregory V. "Residual stresses due to grinding." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-05022009-040807/.
Li, Wenwu 1972. "Exploring the fundamentals of impact breakage events in grinding." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98987.
Population balance models can be used for ball mill optimization, but their use is limited because they are black box models based on incomplete information about the breakage events inside ball mills. Charge motion simulators, based on the discrete element method (DEM), not only provide information about charge media motion, but also collision energy distributions inside ball mills. Ball mill optimization can be achieved using charge motion simulators if the product size distribution can be predicted by linking charge motion results with single particle breakage tests.
Single particle drop tests were carried out to determine the effect of different levels of impact energy. Fundamental ore breakage model equations for an impact breakage event were established, and were applied for the drop weight tests based on a theoretical breakage mechanism. The energy consumptions are calculated with the given feed and product size distribution with the established equations. The comparison of two kinds of drop weight test devices were made and the effect of impact speeds of drop blocks on particle breakage at constant impact energy level was also discussed.
Lin, Zhixin. "An investigation of temperature in form grinding." Thesis, Liverpool John Moores University, 1999. http://researchonline.ljmu.ac.uk/5062/.
Jackson, Andrew. "An investigation of useful fluid flow in grinding." Thesis, Liverpool John Moores University, 2008. http://researchonline.ljmu.ac.uk/5860/.
Gviniashvili, Vladimir. "Fluid application system optimisation for high speed grinding." Thesis, Liverpool John Moores University, 2003. http://researchonline.ljmu.ac.uk/5605/.
Rhoney, Brian Keith. "Cylindrical Wire Electrical Discharge Truing of Metal Bond Diamond Grinding Wheels." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010404-133336.
The goal of this research was to use the wire Electrical Discharge Machining (EDM) to profile a metal bond diamond grinding wheel, and then study the wear and grinding performance of the EDM trued wheel. Diamond wheels are known to exhibit low wheel wear for precision grinding of ceramics but create difficulty in creating precision trued forms. With the increased use of hard engineering ceramics in mechanical design, new methods of truing these wheels had to be investigated. In profiling a vitrified bond diamond wheel, a Computer Numerically Controlled (CNC) single point diamond or a diamond crush roll is often used. However, due to the high strength of the metal bond matrix, these methods cannot be implemented with a metal bond diamond wheel. Instead of applying a mechanical force, Wire Electrical Discharge Truing (WEDT) process utilizes electrical sparks to erode the metal matrix, which allows the non-conductive diamonds to simply fall away. A precision spindle was first built to rotate the wheel inside a traditional wire EDM machine. Once the process proved feasible, grinding studies were developed to compare the performance of a WEDT wheel against a diamond rotary trued/stick dressed wheel. Grinding force, surface finish of the ground silicon nitride parts, and wheel wear were all examined. The surfaces of both truing methods were compared using Stereo-Scanning Electron Microscopy to measure the protruding diamonds' height and identify the wear mechanism. Result of the research shows promise for the future use of WEDT as a truing method for metal bond wheels.
Chen, Xun. "Strategy for the selection of grinding wheel dressing conditions." Thesis, Liverpool John Moores University, 1995. http://researchonline.ljmu.ac.uk/4948/.
Qi, Hongsheng. "A contact length model for grinding wheel-workpiece contact." Thesis, Liverpool John Moores University, 1995. http://researchonline.ljmu.ac.uk/5134/.
Srinivasaraghavan, Madhusudhanan. "Experimental and theoretical investigation of force distribution in the grinding contact zone." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40810.
Une approche expérimentale et une procédure analytique ont été développés pour la prédiction de la répartition de la force dans la meule et zone de contact de la pièce. En outre, un calcul numérique utilisant les méthodes des éléments finis a été réalisée pour vérifier la répartition de la force, dans le cas de broyage. Ce travail a été motivée par la nécessité d'obtenir la force maximale agissante sur les grains abrasifs actifs pour établir la probabilité de rupture du grain et pullouts en raison de cette force. Dans l'approche expérimentale, les forces ont été mesurées lors du meulage d’un petit segment de la roue longueur de contacte entre la meule et la pièce. Les forces mesurées ont été utilisées pour prédire les forces correspondantes à des segments plus petits que les coordonnées complètes de l'arc de contact pour obtenir la répartition. Pour illustrer la méthode, les forces ont été mesurées pour quatre conditions de broyage en utilisant du sable de 60 meules CBN avec un petit segment d’un pièce de l'alliage de nickel (IN718) pièce. Les prévisions de répartition de la force a été constaté à augmenter à un taux décroissant du bas vers le haut de l'arc de contact dans les quatre cas. En outre, les prévisions de répartition de la force a été appliquée pour prédire le pouvoir transitoire de broyage. La puissance prédit a éte trouvée qui corresponde très bien à la puissance mesurée dans les quatre cas. Pour la prévision analytique de la répartition de la force, typique meules CBN et la pièce ont été modelée en utilisant Solidworks, et l'interaction entre chaque grain abrasif sur la meule et la pièce a été simulée individuellement pour quelques révolutions de la meule pour prédire les géométries des coupeaux non coupés pour deux des quatre conditions expérimentales de broyage. Sur la base de ces géométries des coupaux non coupés la force correspondante à chaque grain dans l
Tyabashe, Loyiso. "Determination of the power losses on a tyre-mounted ore-grinding mill." Master's thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/9709.
The objective of this study was to determine the power losses occurring on a tyre-mounted ore-grinding mill designed by Dorbyl Heavy Engineering for Mintek. In order to understand the type of losses occurring on this mill it was decided that a scaled model be built and tested. Such a model mill was designed through the dimensional analysis and similitude technique. This technique enables the reduction of the number of variables to be tested by grouping them into a set of dimensionless parameters, and also allows the results obtained by means of experimentation with the scaled models to be related to the full-scale prototypes. The model mill was constructed in the Mechanical Engineering Workshop at the University of Cape Town. The overall dimensions of the model are 1400 mm long, 1070 mm wide and 892.5 mm high. Its drive-train comprises an electric motor, the wedge and timing belts with the appropriate pulleys, a differential gear set, the tyres, a shell and a disc brake sub-assembly. The tyres used to drive the shell can either be of the pneumatic or solid rubber types. The model mill was designed such that the tyre parameters required in the theoretical solution for power losses, which utilises the Light Vehicle Dynamics Simulation tyre model, could also be measured.
Campbell, William Jarrett. "Model predictive run-to-run control of chemical mechanical planarization /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
Mohammed, Arif. "Applying laser irradiation and intelligent concepts to identify grinding phenomena." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12675/.
Razavi, H. Ali. "Identification and control of grinding processes for intermetalic [sic] compunds [sic]." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/18917.
Alqahtani, Bader. "Examination of Oxidation Sites for Electrolytic In-Process Dressing (ELID) Grinding using SEM." University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1556841748381472.
Barczak, Lukasz. "Application of Minimum Quantity Lubrication (MQL) in plane surface grinding." Thesis, Liverpool John Moores University, 2010. http://researchonline.ljmu.ac.uk/5935/.
Opoz, Tahsin Tecelli. "Investigation of material removal mechanism in grinding : a single grit approach." Thesis, University of Huddersfield, 2012. http://eprints.hud.ac.uk/id/eprint/17818/.
Bhaduri, Debajyoti. "Ultrasonic assisted creep feed grinding and dressing of advanced aerospace alloys." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5415/.
Tsiakoumis, Vaios I. "An investigation into vibration assisted machining : application to surface grinding processes." Thesis, Liverpool John Moores University, 2011. http://researchonline.ljmu.ac.uk/6113/.
Guo, Lei. "Ultraviolet Bonding of Diamond Abrasive Tools for Lap-Grinding Process." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1354572460.
Powell, Malcolm S. "A study of charge motion in rotary mills, with particular reference to the grinding action." Doctoral thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/9657.
The objective of this study was to develop a fundamental understanding of the action of the grinding charge in a mill, and to then correlate this with the metallurgical performance of different mill-liners. To achieve these overall objectives it was first necessary to develop suitable experimental techniques, and the development of these techniques became a large part of the objective of the study. The motion of balls deep within the charge of a rotary grinding mill was investigated. Novel investigative techniques were used to track the motion of the balls, including X-ray filming at 50 frames per second of both the front and side views of a transparent mill, and gamma-camera filming of a radioactive ball. Analysis of the trajectories of the balls revealed several phenomena in the milling action that have not been reported until now. It was observed that the paths of the balls are smooth, that they spiral in and out of the charge, and that the grinding does not take place by rotary nipping of the ore between the balls.
Baines-Jones, Vadim Alexis. "Nozzle design for improved useful fluid flow in grinding." Thesis, Liverpool John Moores University, 2010. http://researchonline.ljmu.ac.uk/5929/.
Khoshaim, Ahmed Bakr. "Single Side Electrolytic In-Process Dressing (ELID) Grinding with Lapping Kinematics of Silicon Carbide." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1396269180.
Bafakeeh, Omar T. "Micro/Nano Surface Finish Single Side Electrolytic In-Process Dressing (ELID) Grinding with Lapping Kinematics of Sapphire." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1491948412941004.
Mihic, Stefan Dragoljub. "CFD Investigation of Metalworking Fluid Flow and Heat Transfer in Grinding." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302189719.
Pourghahramani, Parviz. "Mechanical activation of hematite using different grinding methods with special focus on structural changes and reactivity /." Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1544/2007/08/.
Ng, Sum Huan. "Measurement and modeling of fluid pressures in chemical mechanical polishing." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-03022005-142857/unrestricted/ng%5Fsumhuan%5F200505%5Fphd.pdf.
Steven Danyluk, Committee Chair ; Richard Salant, Committee Member ; Jeffrey Streator, Committee Member ; Michael Sacks, Committee Member ; Dennis Hess, Committee Member ; Leonard Borucki, Committee Member. Includes bibliographical references.
Milner, Andrew Leigh. "The prediction of the outermost trajectory of media in a grinding mill for lifter bars with rounded or worn profiles." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/21702.
Wu, Hui. "Investigation of fluid flow in grinding using LDA techniques and CFD simulation." Thesis, Liverpool John Moores University, 2009. http://researchonline.ljmu.ac.uk/5944/.
Griffin, James. "Pattern recognition of micro and macro grinding phenomenon with a generic strategy to machine process monitoring." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10487/.
Goodall, Clifton. "A study of the throughfeed centreless grinding process with particular reference to the size accuracy." Thesis, Liverpool John Moores University, 1990. http://researchonline.ljmu.ac.uk/4985/.
Diao, Jie. "Development of Techniques to Quantify Chemical and Mechanical Modifications of Polymer Surfaces: Application to Chemical Mechanical Polishing." Diss., Available online, Georgia Institute of Technology, 2004, 2004. http://etd.gatech.edu/theses/available/etd-11222004-001703/.
Samuels, Robert J., Committee Member ; Henderson, Clifford L., Committee Member ; Danyluk, Steven, Committee Member ; Hess, Dennis W., Committee Chair ; Bottomley, Lawrence A., Committee Member ; Morris, Jeffrey F., Committee Co-Chair. Vita. Includes bibliographical references.
Nisal, Tejas V. "Monitoring of Surface Grinding process using Acoustic Emission (AE) with emphasis on Cutting Fluid selection." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1404341563.