Dissertations / Theses: 'Grinding machines'

1

Agahi, Maryam. "Grinding polycrystalline diamond using a diamond grinding wheel." Access electronically, 2006. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20061114.150854/index.html.

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Orton, P. A. "Instrumentation and control for precision grinding machines." Thesis, Nottingham Trent University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278450.

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This thesis examines the present methods of centre less bearing grinding, with a view to applying IIDderncontrol nethods in order to reduce the distribution of output size variations and improve the quality of surface finish. Established rrodels of the grinding process shew that various inportant parameters describing the process can be derived, providing that the grinding power can be accurately rronitored. Several alternative control strategies based on paNer rronitoring are considered. The drive systems of a typical grinding machine are rrodelled as they react through the non-linear grinding wheel/work interface. A simplified computer simulation of the process is demonstrated. Suitable rrethods of instrumentation are evaluated including the optical shaft encoder as a source of high resolution data for the estimation of drive shaft dynamics. A method is devised for on line pararreter estimation of the drive system transfer functions. This enables the important grinding power to be estimated fran shaft dynamics and also al loes the rronitoring of the drive system parameters. The cpt.ica l shaft encoder is also assessed as the source of data for vibration detection. A development conputer with real tine multi-tasking operating system software and specialised shaft encoder interfacing has been established as a basis for an expandable control and rronitoring system. A plan for feeackcontrol of the grinding, involving several separate control algorithms cormunicating with an expert system executive controller, is outlined.

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Hecker, Rogelio Lorenzo. "Power feedback control in cylindrical grinding process." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16619.

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Cowan, Richard Watson. "An adaptive statistically based controller for through-feed centerless grinding." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17570.

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Braden, Jason Patrick. "Open architecture and calibration of a cylindrical grinder." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18190.

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Banini, George Agbeko. "An integrated description of rock breakage in comminution machines /." [St. Lucia], 2000. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16293.pdf.

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7

Hekman, Keith Alan. "Precision control in compliant grinding via depth-of-cut manipulation." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/16627.

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8

Pena-Diaz, Hernan R. "Experimental validation of an atomization model for fluids used in the grinding process." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/18999.

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9

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.

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10

Milton, Gareth Edward Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "An automated micro-grinding system for the fabrication of precision micro-scale profiles." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2006. http://handle.unsw.edu.au/1959.4/32285.

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Production of micro-scale components is an important emergent field. One underdeveloped area is the production of micro-scale 3D surfaces, which has important applications in micro-optics and fibre optic sensors. One particular application is the production of micro-lenses. With scales of less than 200 ??m these lenses can improve light coupling efficiencies in micro-optic systems. However, current lens production techniques have limitations in accuracy and versatility. Creating these surfaces through mechanical micro-grinding has the potential to improve the precision and variety of profiles that can be produced, thus improving transmission efficiencies and leading to new applications. This work presents a novel micro-grinding method for the production of microscale asymmetric, symmetric and axisymmetric curved components from brittle materials such as glasses. A specialised micro-grinding machine and machining system has been designed, constructed and successfully tested and is presented here. This system is capable of producing complex profiles directly on the tips of optical fibre workpieces. A five degree of freedom centring system is presented that can align and rotate these workpieces about a precision axis, enabling axisymmetric grinding. A machine vision system, utilising a microscope lens system and sub-pixel localisation techniques, is used to provide feedback for the process, image processing techniques are presented which are shown to have a sensing resolution of 300 nm. Using these systems, workpieces are centred to within 500 nm. Tools are mounted on nanometre precise motion stages and motion and infeed are controlled. Tooling configurations with flat and tangential grinding surfaces are presented along with control and path generation algorithms. The capabilities and shortcomings of each are presented along with methods to predict appropriate feed rates based on experimental data. Both asymmetric and axisymmetric flat and curved micro-profiles have been produced on the tips of optical fibres using this system. These are presented and analysed and show that the system, as described, is capable of producing high quality micro-scale components with submicron dimensional accuracy and nanometric surface quality. The advantages of this technique are compared with other processes and discussed. Further development of the system and technique are also considered.

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Apelt, T. A. "Inferential measurement models for semi-autogenous grinding mills." Thesis, School of Chemical and Biomolecular Engineering. Faculty of Engineering and Information Technologies, 2007. http://hdl.handle.net/2123/12117.

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Mankosa, Michael James. "Investigation of operating conditions in stirred ball milling of coal." Thesis, This resource online, 1986. http://scholar.lib.vt.edu/theses/available/etd-03122009-040831/.

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13

Xie, Qiulin. "Modeling and control of linear motor feed drives for grinding machines." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22630.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Steven Y Liang; Committee Member: Chen Zhou; Committee Member: David G Taylor; Committee Member: Min Zhou; Committee Member: Shreyes N Melkote.

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14

Del, Villar René. "Modelling and simulation of Brunswick mining grinding circuit." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72758.

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15

Bona, Melissa Ellen. "The effect of straightening and grinding of welds on track roughness." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16180/7/Thesis_Melissa_Bona.pdf.

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Rail is a very expensive component of the railway track. Therefore, research methods extending rail life have great economic importance. During the past thirty years and, particularly during the past ten years there has been an increasing awareness throughout most rail networks in the world of the need to introduce improved design criteria, better construction techniques and higher standard track generally. This implies that quality control at all levels is mandatory if these objectives are to be achieved. With the improved understanding of degradation of track, a more complete comprehension of the costs associated with different operating and infrastructure conditions should also be developed, aiding in the determination of efficient maintenance costs and their contribution to access charges. Track and structures together account for 60% of maintenance costs, with 50% of the total being track. The UIC has done a lot of work on comparative performance indicators, and these show what potential savings much be out there for the taking, just by adopting current best practice. The old wisdom is that it's not enough o do things rights; we have to make sure that we do the right things. These developments have largely resulted from the demand for higher speeds particularly in passenger services and the demand to accept heavier axle loads of freight traffic. Whilst the conventional railway track structure is not likely to change significantly over the next ten years there will be a requirement over that period for better quality track infrastructure. This means less rail surface defects, less internal defects and less wheels irregularities. The presence of rail surface defects generally increases the roughness of the track leading to a poor passenger ride and increased safety risk with freight traffic. In addition, rail surface defects will generally increase the degradation rate of other track components; however, not all defects will produce visible track deterioration. Dynamic impacts produced by the rollingstock running over rail surface defects, such as poor welds, will, over time, create continuous rail defects, loosening of fastenings, abrasion and skewing of sleepers, crushing of ballast and loss of formation geometry. It is only in the recent years that the importance of poor welds in track has been identified. Dips and peaks must be recognised as a severe track irregularity that needs to be addressed and removed. Current maintenance activities have little effect on removing misaligned welds in track and the improvement obtained after the maintenance works is generally short lived. On the other hand, straightening operations have proven to solve the problem and maintain the results following 7 months of traffic. As part of this project, a six kilometre test section was selected on the Mt Isa Line and all welds located in this region were monitored for over 9 months to increase the understanding of the effect of individual maintenance activities on the track roughness. Three 2km Divisions were established; each Division had different maintenance activities and levels of intervention completed over the duration of the project. Over 15,000 readings were recorded and analysed. The following conclusions were drawn. The effect of cycle tamping was clearly identified when comparing the means of weld located in Division 1, 2 to the mean of welds in Division 3. Cycle tamping showed to have a significant positive effect on the dipped welds geometry and an increase in severity of peaked welds prior to their correction. Straightening operations completed in Division 1 and 2 reduced the overall mean of weld misalignments. These Divisions were subjected to different levels of straightening intervention however they produced similar results. Division 1 all dips were straightened and Division 2 only dips >0.3mm were straightened. This means that no additional benefit, in terms of overall misalignment of welds, can be gained when straightening operations target dips with a misalignment smaller than 0.3mm. Cycle grinding proved to have little effect on the removal of both dips and peaks. In fact, due to the configuration of the grinding machine, grinding operation produced a slight worsening of the dips misalignments and only a minor improvement of peaks. Although long term monitoring of the site may show minor variations in weld geometry performance, after approximately 3.9 Mgt of traffic the mean of dipped welds in Division 1 and 2 appeared to remain unaltered, as Division 3 showed a minor worsening. Furthermore, the mean of peaked welds in Division 1 and 2 appeared to remain unaltered, as Division 3 showed a minor worsening.

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16

Bona, Melissa Ellen. "The effect of straightening and grinding of welds on track roughness." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16180/.

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Abstract:

Rail is a very expensive component of the railway track. Therefore, research methods extending rail life have great economic importance. During the past thirty years and, particularly during the past ten years there has been an increasing awareness throughout most rail networks in the world of the need to introduce improved design criteria, better construction techniques and higher standard track generally. This implies that quality control at all levels is mandatory if these objectives are to be achieved. With the improved understanding of degradation of track, a more complete comprehension of the costs associated with different operating and infrastructure conditions should also be developed, aiding in the determination of efficient maintenance costs and their contribution to access charges. Track and structures together account for 60% of maintenance costs, with 50% of the total being track. The UIC has done a lot of work on comparative performance indicators, and these show what potential savings much be out there for the taking, just by adopting current best practice. The old wisdom is that it's not enough o do things rights; we have to make sure that we do the right things. These developments have largely resulted from the demand for higher speeds particularly in passenger services and the demand to accept heavier axle loads of freight traffic. Whilst the conventional railway track structure is not likely to change significantly over the next ten years there will be a requirement over that period for better quality track infrastructure. This means less rail surface defects, less internal defects and less wheels irregularities. The presence of rail surface defects generally increases the roughness of the track leading to a poor passenger ride and increased safety risk with freight traffic. In addition, rail surface defects will generally increase the degradation rate of other track components; however, not all defects will produce visible track deterioration. Dynamic impacts produced by the rollingstock running over rail surface defects, such as poor welds, will, over time, create continuous rail defects, loosening of fastenings, abrasion and skewing of sleepers, crushing of ballast and loss of formation geometry. It is only in the recent years that the importance of poor welds in track has been identified. Dips and peaks must be recognised as a severe track irregularity that needs to be addressed and removed. Current maintenance activities have little effect on removing misaligned welds in track and the improvement obtained after the maintenance works is generally short lived. On the other hand, straightening operations have proven to solve the problem and maintain the results following 7 months of traffic. As part of this project, a six kilometre test section was selected on the Mt Isa Line and all welds located in this region were monitored for over 9 months to increase the understanding of the effect of individual maintenance activities on the track roughness. Three 2km Divisions were established; each Division had different maintenance activities and levels of intervention completed over the duration of the project. Over 15,000 readings were recorded and analysed. The following conclusions were drawn. The effect of cycle tamping was clearly identified when comparing the means of weld located in Division 1, 2 to the mean of welds in Division 3. Cycle tamping showed to have a significant positive effect on the dipped welds geometry and an increase in severity of peaked welds prior to their correction. Straightening operations completed in Division 1 and 2 reduced the overall mean of weld misalignments. These Divisions were subjected to different levels of straightening intervention however they produced similar results. Division 1 all dips were straightened and Division 2 only dips >0.3mm were straightened. This means that no additional benefit, in terms of overall misalignment of welds, can be gained when straightening operations target dips with a misalignment smaller than 0.3mm. Cycle grinding proved to have little effect on the removal of both dips and peaks. In fact, due to the configuration of the grinding machine, grinding operation produced a slight worsening of the dips misalignments and only a minor improvement of peaks. Although long term monitoring of the site may show minor variations in weld geometry performance, after approximately 3.9 Mgt of traffic the mean of dipped welds in Division 1 and 2 appeared to remain unaltered, as Division 3 showed a minor worsening. Furthermore, the mean of peaked welds in Division 1 and 2 appeared to remain unaltered, as Division 3 showed a minor worsening.

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17

Mukepe, Kahilu Moise. "Identification and control of wet grinding processes: application to the Kolwezi concentrator." Doctoral thesis, Universite Libre de Bruxelles, 2013. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209562.

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Enhancing mineral processing techniques is a permanent challenge in the mineral and metal industry. Indeed to satisfy the requirements on the final product (metal) set by the consuming market, control is often applied on the mineral processing whose product, the ore concentrate, constitutes the input material of the extractive metallurgy. Therefore much attention is paid on mineral processing units and especially on concentration plants. As the ore size reduction procedure is the critical step of a concentrator, it turns out that controlling a grinding circuit is crucial since this stage accounts for almost 50 % of the total expenditure of the concentrator plant. Moreover, the product particle size from grinding stage influences the recovery rate of the valuable minerals as well as the volume of tailing discharge in the subsequent process.

The present thesis focuses on an industrial application, namely the Kolwezi concentrator (KZC) double closed-loop wet grinding circuit. As any industrial wet grinding process, this process offers complex and challenging control problems due to its configuration and to the requirements on the product characteristics. In particular, we are interested in the modelling of the process and in proposing a control strategy to maximize the product flow rate while meeting requirements on the product fineness and density.

A mathematical model of each component of the circuit is derived. Globally, the KZC grinding process is described by a dynamic nonlinear distributed parameter model. Within this model, we propose a mathematical description to exhibit the increase of the breakage efficiency in wet operating condition. In addition, a relationship is proposed to link the convection velocity to the feed ore rate for material transport within the mills.

All the individual models are identified from measurements taken under normal process operation or from data obtained through new specific experiments, notably using the G41 foaming as a tracer to determine material transport dynamics within the mills. This technique provides satisfactory results compared to previous studies.

Based on the modelling and the circuit configuration, both steady-state and dynamic simulators are developed. The simulation results are found to be in agreement with the experimental data. These simulation tools should allow operator training and they are used to analyse the system and to design the suitable control strategy.

As the KZC wet grinding process is a Multi-Input Multi-Output (MIMO) system, we propose a decentralized control scheme for its simplicity of implementation. To overcome all the control issues, a Double Internal Model Control (DIMC) scheme is proposed. This strategy is a feedforward-feedback structure based on the use of both a modified Disturbance Observer (DOB) and a Proportional-Integral Smith-Predictor (PI-SP). A duality between the DOB and PI-SP is demonstrated in design method. The latter is exploited to significantly simplify the design procedure. The designed decentralized controllers are validated in simulation on the process linearized model. A progressive implementation of the control strategy is proposed in the context of the KZC grinding circuit where instrumentation might not be obvious to acquire./

Améliorer les techniques de traitement de minerais est un défi permanent dans l'industrie des minéraux et des métaux. En effet, pour satisfaire aux exigences du produit fini (métal ) fixées par le marché de consommation, la commande automatique est souvent appliquée à l'usine du traitement de minerais dont le produit, le concentré, constitue la matière première de la métallurgie extractive. Une attention particulière est donc dévolue aux unités de traitement de minerais et en particulier aux concentrateurs. Comme le processus de réduction des dimensions granulométriques du minerai est l'étape critique d'un concentrateur, il s'avère que la commande d'un circuit de broyage est cruciale, car ce stade représente près de 50 % des dépenses totales de l' usine de concentration. De plus, la dimension granulométrique du produit de l'étape de broyage influe sur le taux de récupération des minéraux utiles ainsi que sur le volume des rejets du processus ultérieur.

La présente thèse porte sur une application industrielle, à savoir le concentrateur de Kolwezi (KZC qui est un circuit de broyage humide à double boucle fermée. Comme tout processus industriel de broyage humide, ce procédé présente une problématique de commande complexe et difficile en raison de sa configuration et des exigences relatives aux caractéristiques du produit. En particulier, nous nous intéressons à la modélisation de ce procédé et à proposer une stratégie adéquate de commande dans le but de maximiser le débit de production tout en respectant les exigences quant à la finesse et à la densité de la pulpe produite.

Un modèle mathématique de chaque composant du circuit a été déterminé. Globalement, le processus de broyage de KZC est décrit par un modèle dynamique non linéaire à paramètres distribués. Dans ce modèle, une description mathématique de l'augmentation de l'efficacité du broyage en milieu humide est proposée. En outre, nous avons proposé une relation liant la vitesse de convection au débit d'alimentation de minerais dans le modèle du transport de la matière à l'intérieur des broyeurs.

Tous les modèles mathématiques ont été identifiés à partir de mesures prises sur le procédé en fonctionnement d'équilibre stable ou à partir des données obtenues grâce à des nouvelles expériences spécifiques, notamment en utilisant le moussant G41 comme traceur pour déterminer la dynamique de transport de la matière dans les broyeurs. Cette technique a produit des résultats cohérents par rapport aux études antérieurs réalisées au moyen du traceur colorant ou radioactif.

Les simulateurs statique et dynamique ont été développés sur la base de la modélisation mathématique et de la configuration du circuit. Les résultats des simulations sont en accord avec les données expérimentales. Ces outils de simulation devraient permettre la formation des opérateurs et ont été utilisés pour analyser le système et concevoir la stratégie de commande la plus appropriée.

Comme le processus de broyage humide de KZC est un système à plusieurs grandeurs d'entrée et plusieurs grandeurs de sortie, nous avons proposé une structure de commande décentralisée en raison de sa simplicité de mise en œuvre .Afin de surmonter tous les problèmes de commande, un schéma de commande à double modèle interne (CDMI) est proposée. Cette stratégie est une structure à anticipation - rétroaction basée sur l'utilisation d'un observateur de perturbations (OBP) et d'un Prédicteur de Smith doté d'un régulateur Proportionnel-Intégral (PS-PI). Une dualité entre l'OBP et le PS-PI est démontrée dans la méthode de conception. Cette propriété est exploitée pour simplifier considérablement la procédure de conception. Les régulateurs décentralisés ainsi conçus sont validés en simulation sur le modèle linéarisé du procédé. Une mise en œuvre progressive de la stratégie de commande est proposée dans le contexte du circuit de broyage de KZC où l'instrumentation peut ne pas être évidente à acquérir.

Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished

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Beránek, Jakub. "Bezpečnost CNC brusek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382265.

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This thesis deals with safety of the CNC grinding machines. The first part of this thesis is focusing on legislative requirements of EU and Czech Republic, which concern with topic of this thesis. The second part of the thesis is focusing on the safety of the chosen grinding machine. The main parts of the machine which are important for safety are described and then the checklists for verification of the safety requirements are made.

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Fríd, Filip. "Návrh komunikačního mixu vybraného podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2016. http://www.nusl.cz/ntk/nusl-241545.

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The thesis is focused on proposal of communication mix for the producer of high-precision grinding machines. This contains the most important concepts and principles related to the current issues of marketing in the B2B segment. Furthermore, a detailed analysis of the current state of the company and created a specific proposal of new communication mix, which should lead the fulfillment of the objectives set.

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Jermolajev, Štěpán. "Kontinuální odvalovací broušení čelního ozubení." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230504.

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The diploma thesis deals with the technology of continuous generating gear grinding. With reference to this technology, used grinding wheels and grinding machines are described. A detailed analysis is devoted to the technological parameters of the grinding process and their influence on the resultant tooth flank surface integrity. In order to verify described rules, the diploma thesis contains results of practical experiments as well.

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Koláček, David. "Zefektivnění technologie rozbrušování konstrukčními úpravami." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232196.

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This thesis is oriented to technological and design direction. It is focused on the upgrading of existing machinery from a structural perspective. There is studied the impact of design modifications to the existing production process from a technological point of view. This thesis is specifically concentrated on the technology division of the material, especially on the technology cutting-off in dry condition. There is examined the ability of self-sharpening cutting tools and the quality of the final product under varying input conditions. The job is finished by the carried out techno-economic evaluation, where are compared the costs of the structural adjustments in comparison with mechanical equipment, that could be purchased on the market. The thesis is finished with overall analysis of the optimal efficiency of the production process.

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Коротун, Микола Миколайович, Николай Николаевич Коротун, Mykola Mykolaiovych Korotun, Я. В. Сорока, and Y. V. Soroka. "Measuring and control devices grinding machine." Thesis, Вид-во СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/5580.

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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/.

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The work within this Thesis is concerned with the manufacturing processes associated with the production of blade root mounting slots in aeroengine compressor and turbine discs. Typically slots are of dovetail or fir-tree geometry dependent on specific design requirements. The state of the art process across the industry is broaching however, despite achieving required geometrical tolerances and surface integrity for decades the process is not without its disadvantages. Primarily these include the inflexibility of the process, machine tool cost; size and cutting forces, complexity of tooling and set up and further the limited level of control of the process beyond tooling design. This has led to research into alternative processes across a range of conventional and non-conventional manufacturing techniques. Work presented here focuses on two key technology areas, namely point grinding and electrolytic point grinding. The former applies small diameter single layer grinding wheels on a high speed machining centre with spindle capability in the region of 60,000rpm. Target geometry was a complex fir-tree root form requiring dimensional control to within +/- 5um and a surface integrity in line with critical aerospace components. The later process investigated the unification of point grinding and electrochemical machining on a vertical machining centre to assess process performance across a range of variables.

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Портюх, Крістіна Валеріївна. "Цех з виробництва паперу для простирадл з целюлози у системі Публічного акціонерного товариства «Кохавинська паперова фабрика» з розробленням технологічного потоку." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/29114.

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Дипломний проект: стор.85 , рис.3 , табл.11 , першоджерел 11, додатків 1. Метою дипломного проекту було розроблення технологічного потоку з виробництва паперу для простирадл з целюлози на основі Публічного акціонерного товариства «Каховинська паперова фабрика». Наведено стандарти та сертифікати якості на сировину, хімікати та готову продукцію. Розроблено та описано технологічну схему з виробництва паперу для простирадл. Розраховано матеріальний баланс води та волокна, а також тепловий баланс контактно-конвективного методу сушіння, для виробництва 1 т продукції. Проведено розрахунок та вибір основного обладнання. Описано об’ємно-планувальне і конструктивне рішення будівлі цеху. Наведені заходи щодо охорони навколишнього середовища.
Diploma project: pag. 85, draw. 3, 11 tables, primary sources 11, addition 1 The purpose of the diploma project was to develop a technological flow for the production of paper for a sheet on the basis of the Public Joint Stock Company "Kakhovinsky Paper Mill". The standards and quality certificates for raw materials, chemicals and finished products are given. A technological scheme for the production of sheet metal sheets has been developed and described. The material balance of water and fiber has been calculated, as well as the thermal balance of contact-convection drying method, for the production of 1 ton of product. The calculation and selection of basic equipment has been carried out. The volume-planning and constructive decision of the building of the shop is given. The measures on environmental protection are given.

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Barlow, N. "High-rate grinding wheel design." Thesis, Liverpool John Moores University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380664.

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Scagnetti, Paul Albert. "Design of an industrial precision ceramic grinding machine." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10918.

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27

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.
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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Johnson, S. P. "An investigation into below centre centreless grinding." Thesis, Coventry University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234797.

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Ebbrell, Stephen. "Process requirements for precision grinding." Thesis, Liverpool John Moores University, 2003. http://researchonline.ljmu.ac.uk/5633/.

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30

Thomas, David Andrew. "An adaptive control system for precision cylindrical grinding." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243279.

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31

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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32

Cross, P. M. "An analysis of the geometric instability of steady supported grinding." Thesis, University of Bristol, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384445.

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Lin, Zhixin. "An investigation of temperature in form grinding." Thesis, Liverpool John Moores University, 1999. http://researchonline.ljmu.ac.uk/5062/.

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Jackson, Andrew. "An investigation of useful fluid flow in grinding." Thesis, Liverpool John Moores University, 2008. http://researchonline.ljmu.ac.uk/5860/.

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Gviniashvili, Vladimir. "Fluid application system optimisation for high speed grinding." Thesis, Liverpool John Moores University, 2003. http://researchonline.ljmu.ac.uk/5605/.

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36

Chen, Xun. "Strategy for the selection of grinding wheel dressing conditions." Thesis, Liverpool John Moores University, 1995. http://researchonline.ljmu.ac.uk/4948/.

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Qi, Hongsheng. "A contact length model for grinding wheel-workpiece contact." Thesis, Liverpool John Moores University, 1995. http://researchonline.ljmu.ac.uk/5134/.

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38

Mohammed, Arif. "Applying laser irradiation and intelligent concepts to identify grinding phenomena." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12675/.

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The research discussed in this thesis explores a new method for the detection of grinding burn temperature using a laser irradiation acoustic emission (AE) sensing technique. This method is applicable for the grinding process monitoring system, providing an early warning for burn detection on metal alloy based materials (specifically nickel alloy based materials: Inconel718 and MarM002). The novelty in this research is the laser irradiation induced thermal AE signal that represents the grinding thermal behaviour and can be used for grinding burn detection. A set of laser irradiation experiments were conducted to identify key process characteristics. By controlling the laser power, the required grinding temperatures were simulated on alloy test materials. The thermal features of the extracted AE signal were used to identify the high, medium and low temperature signatures in relation to the off-focal laser distances. Grinding experiments were also conducted to investigate burn conditions. The extracted AE data was used to identify grinding burn and no burn signatures in relation to the depth of cuts. A new approach using an artificial neural network (ANN) was chosen as the pattern recognition tool for classifying grinding burn detection and was used to classify grinding temperatures by extracting the mechanical-thermal grinding AE signal. The results demonstrated that the classification accuracy achieved was 66 % for Inconel718 and 63 % for MarM002 materials. The research established that the wheel wear has a large influence on the creation of burn within the workpiece surface. The results demonstrated that the AE signals in each grinding trial presents different levels of high, medium and low temperature scales. This type of information provides a foundation for a new method for monitoring of grinding burn and wheel wear.

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Barczak, Lukasz. "Application of Minimum Quantity Lubrication (MQL) in plane surface grinding." Thesis, Liverpool John Moores University, 2010. http://researchonline.ljmu.ac.uk/5935/.

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The aim of this research was to acquire and formalise understanding of the Minimum Quantity Lubrication (MQL) technique in the surface grinding operation. The investigation aimed to show through experiment and theoretical study the effects of MQL on grinding process performance, measured in terms of tangential and normal forces, temperature and surface finish. A comparison of conventional, dry and MQL fluid delivery methods was performed. The experimental study was undertaken on a CNC grinding machine with integrated monitoring. A Taguchi methodology was employed to provide qualitative evidence of the strength of process parameters on performance indicators. The usefulness and promise of MQL was established. The study identified regimes of grinding where MQL can be employed successfully. This outcome is supported by results showing, in some applications, that MQL is comparable in performance to grinding under conventional fluid delivery. It was found that for some conditions MQL outperformed conventional fluid delivery. This was particularly so in the case of the tests with material EN8, (approximately 32 HRQ), where MQL was found to outperform conventional fluid delivery in almost all measures. As expected, not all conditions were in favour of MQL delivery and the reasons for this are discussed in detail in the thesis. A theoretical explanation for the efficient process performance is developed in relation to the experimental results obtained. The effects of variables such as DOC, dressing conditions, wheel speeds, workpiece speed and workpiece material are considered. It is reasoned that the MQL technique achieves efficient performance due to effective lubrication and effective contact region penetration by the fluid. Effective lubrication conditions were confirmed by highly competitive specific energy and grinding force measurements.

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40

Hecker, Rogelio Lorenzo. "Part surface roughness modeling and process optimal control of cylindrical grinding." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/16704.

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41

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/.

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This thesis has investigated material removal mechanisms in grinding by considering single grit workpiece interaction. The investigation was performed both experimentally and using finite element simulation. Rubbing, ploughing and cutting mechanisms occurring during the grinding process were studied at the micro scale. Due to its nature the rubbing phase occurs in a very narrow region of grit-workpiece engagement and is difficult to examine under a microscope and so was investigated using FEM simulation. The ploughing mechanism was thoroughly investigated using both experimental tests and FEM simulations, and a similar trend was observed for the pile up ratio along the scratch path from the experimental tests and the FEM simulations. Ploughing and cutting mechanisms in grinding were found to be highly influenced by grit cutting edge shape, sharpness and bluntness. Cutting is the prominent mechanism when the grit cutting edge is sharp, but ploughing is more prominent when the grit cutting edge becomes flattened. In the case of multiple edges scratch formation, ploughing is dramatically increased compared to single edge scratches. Feasibility of ground surface simulation using FEM is demonstrated using multiple pass scratch formation in a cross direction. Although chip formation mechanism is developed at a relatively higher depth of cut (greater than 10 μm), at small scales down to 1 μm, FEM simulation was not a suitable method to use. To reduce the drawbacks of FEM simulation in micro scale cutting, a meshless simulation technique such as smooth particle hydrodynamics is recommended for future studies.

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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/.

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The research involves the investigation of hybrid ultrasonic assisted creep feed grinding (UACFG) of advanced aeroengine alloys, in particular Inconel 718, CMSX-4 and gamma titanium aluminide (γ-TiAl). For tests with ultrasonic vibration, workpieces were actuated at a constant frequency (~20kHz) via a specially designed block sonotrode attached to a 1kW piezoelectric transducer-generator system. The trials on nickel based superalloys were carried out using open structured alumina wheels whereas γ-TiAl specimens were machined with conventional silicon carbide and single layer diamond superabrasive wheels. Statistically designed experiments involving variation in wheel speed, table speed, depth of cut, grinding condition and vibration amplitude were employed in mainstream testing. Reductions in grinding force components were typically observed albeit at the cost of higher wheel wear and surface roughness of the ground slots when ultrasonic assisted grinding of nickel alloys. Conversely, UACFG of γ-TiAl exhibited lower grinding wheel wear and workpiece surface roughness. Surfaces ground with the assistance of vibration generally revealed greater side flow/ploughing and overlapping grit marks in comparison to standard creep feed ground specimens. Three dimensional topographic measurement of grinding wheel surface replicas indicated that ultrasonic vibration led to an increase in the number of active cutting points on the wheel.

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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/.

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The purpose of this study was to apply vibrations to the workpiece during surface grinding in order to improve the performance of the process. In addition to this, further necessary parameters were examined and analysed. A first step was to design the vibrating rig and after a number of different designs the most suitable model was selected for the conduction of the preliminary studies. However, a novel-improved system was designed and manufactured in order to undertake the full volume of experimental work. A number of simulations including stress and modal analysis were carried out and all the static and dynamic characteristics of the rigs were identified. Moreover, the exact dynamic behaviour of the rigs - including their natural frequencies - was established though real experiments. Sweep - sine and impact tests were employed in order to identify these dynamic parameters and the results were compared to those of simulation with the intention to detect the amount of error between these techniques. The rigs were vibrated at their resonant frequencies in order to achieve high values of amplitude with low voltage input. The static and dynamic characteristics of the grinding machine tool were identified. Similar methods such as sweep-sine test were employed in order to find the natural frequency of the machine tool's spindle unit. Static and dynamic stiffness of the machine tool's spindle unit as well as its compliance were identified. The preliminary studies showed an improvement in surface quality of the workpiece as well as a small reduction in cutting forces. This reduction was getting bigger with the increase of depth of cut. The main body of experimental work followed and showed that for 25 urn depths of cut, the vibration-assisted method could decrease up to 22.5 % the tangential forces. Furthermore, the effect of vibration was getting more noticeable at higher wheelspeeds and workspeeds. At those speeds the reduction in workpiece surface roughness reached 12.6%. Moreover, it was found that the application of vibration increased the material removal rate, reduced the cutting forces, increased the G-ratio and produced lower values of wheel wear compared to conventional grinding. Finally, an innovative closed-loop vibration control system was used for the process which could control the amplitude and the frequency of vibration in the actual grinding cycle. This I A Abstract system managed to control the applied values of vibration amplitude at resonant or near resonant frequencies. It was found that for higher depths of cut the closed-loop vibration control reduced the normal forces by 19% compared to open-loop control and 21 % compared to conventional grinding. Furthermore, the closed-loop control system performed better in terms of workpiece surface quality when grinding mild steel compared to conventional grinding and open-loop vibration control.

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Чайка, Р. А. "Дослідження процесу шліфування шатунних та корінних шийок колінчатого валу." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/25297.

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Чайка, Р. А. Дослідження процесу шліфування шатунних та корінних шийок колінчатого валу : випускна кваліфікаційна робота : 133 "Галузеве машинобудування" / Р. А. Чайка ; керівник роботи А. В. Кологойда ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 100 с.
В роботі проведено патентно-інформаційний пошук. В конструкторському розділі були розглянуті конструктивні особливості шліфувального верстата моделі ВЗ 208Ф3, було проведено розрахунок шпонки, пасової передачі та розрахунок шпинделя на жорсткість, було вибрано шліфувальний круг. В науково-дослідному розділі наведено математичне моделювання процесу обробки корінних та шатунних шийок колінчастого вала, проведено аналіз формоутворюючої системи верстату.
In the work a patent information search was conducted. In the design section the design features of the grinding machine of the VZ 208F3 model were considered, the calculation of the keyway, belt transmission and the calculation of the spindle for rigidity, the grinding wheel was selected. The research section presents mathematical modeling of the process of treatment of the crankshaft and crankshaft neck, the analysis of the forming machine system.

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Stránský, Michal. "Broušení součástí ventilů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230782.

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This diploma thesis deals with grinding of parts of valves. In the first part is theoretically described valve and its manufacturing. Another part focuses on the analysis of existing grinding technology. In last part of this diploma thesis is written about choosing of suitable places for rationalization, design of rationalization and technical-economic evaluation of performed rationalization.

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46

Labotski, Alexeii Ucamel. "Developmental studies on a portable grinding device for machine tools." Thesis, 2012. http://hdl.handle.net/10210/4502.

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M.Ing.
A large number of machine tools in use today are worn and can not produce the correct tolerances as a result of the inaccuracy of the structure. A device was developed to assist in the solution to the problem. The study of the development of this device includes several different fields. An entire prototype scale model of a grinding device is developed, with components including a control system and a developed sensor. The control system consists of circuitry and programming. The programming has been done in Visual Basic. The circuitry includes driver circuits for DC motors as well as pulse width modulation circuits and filters, amplifiers and comparators for the newly developed sensors. The sensor developed is an optical device, which can sense the deviation of a cable for reference for the movement of the device. A combination of the above components into a unit and the provision for factors, such as grinding forces and vibrations, which influence the operation of the device, are presented. Furthermore, an analytical model is suggested for the prediction of the system's behavior.

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47

Jayasundara, Chandana Tilak Materials Science &amp Engineering Faculty of Science UNSW. "Numerical and experimental studies of granular dynamics in IsaMill." 2007. http://handle.unsw.edu.au/1959.4/40734.

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IsaMill is a stirred type mill used in mineral industry for fine and ultra-fine grinding. The difficulty in obtaining the internal flow information in the mill by experimental techniques has prevented the development of the fundamental understanding of the flow and generating general methods for reliable scale-up and optimized design and control parameters. This difficulty can be effectively overcome by numerical simulation based on discrete element method (DEM). In this work a DEM model was developed to study particle flow in a simplified IsaMill. The DEM model was validated by comparing the simulated results of the flow pattern, mixing pattern and power draw with those measured from a same scale lab mill. Spatial distributions of microdynamic variables related to flow and force structure such as local porosity, particle interaction forces, collision velocity and collision frequency have been analyzed. Among the materials properties of particles, it is shown that by decreasing particle/particle sliding friction coefficient, the particle flow becomes more vigorous which is useful to grinding performance. Restitution coefficient does not affect the particle flow significantly. A too low or too high particle density could decrease grinding efficiency. Although grinding medium size affects the flow, its selection may depend on the particle size of the products. Among the operational variables considered, the results show that fill volume and mill speed proved to be important factors in IsaMil process. Increase of fill volume or mill speed increases the interaction between particles and agitating discs which results in a more vigorous motion of the particles. Among the mill properties, particle/stirrer sliding friction plays a major role in energy transfer from stirrer to particles. Although there exists a minimum collision energy as particle/stirrer sliding friction increases, large particle/stirrer sliding friction may improve grinding performance as it has both large collision frequency and collision energy. However, that improvement is only up to a critical particle/disc sliding friction beyond which only input energy increases with little improvement on collision frequency and collision energy. Reducing the distance between stirrers or increasing the size of disc holes improves high energy transfer from discs to particles, leading to high collision frequency and collision energy. Among the different stirrer types, the energy transfer is more effective when disc holes are present. Pin stirrer shows increased collision energy and collision frequency which also result in a high power draw. Using the DEM results, a wear model has been developed to predict the wear pattern of the discs. This model can be used to predict the evolution of the disc wear with the time. It is shown that energy transfer from discs to particles are increased when discs are worn out. An attempt has also been made to analyze the microdynamic properties of the mill for different sizes. It is shown that specific power consumption and impact energy are correlated regardless of the mill size and mill speed.

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48

Lee, Hsinghan, and 李興漢. "Study in Hydrostatic Slider-Slideway of Grinding Machines." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/99830228232863895066.

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碩士
中原大學
機械工程研究所
90
Abstract Because hydrostatic slideways have absolutely merits and the improvements of technologies in their design, Since 1970 hydrostatic slideways have been widely used by the machine tool . According to the recently reports of the grinder machinery companies in developed countries, the machines , which are equipped with hydrostatic slider and slideways , could been run continuously for a decade without any maintaining. This study has emphasized on the design method of hydrostatic slideways, which can be used by the precision cylindrical grinding machines. First of all, in order to measure the characteristics of the cylindrical grinding machine －GUP-32100 made by PARAGON machinery company－such as static oil film of slider, stiffness, loading dynamic system and stick-slip friction system, we applied the capillary restriction hydrostatic slideways to the cylindrical grinding machine and then experimentally analysed the statistic characteristics and loading dynamic system of the capillary restriction hydrostatic guide ways. After comparing the characteristics of capillary restriction hydrostatic guide ways to the characteristics of non-capillary restriction slider, we can find the differences of them and ,in order to improve the precision of machinery, make it as a reference for the technologies of hydrostatic slideways’ design.

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49

Lin, Wei-Jhih, and 林暐智. "Study on Structure Stiffness and Process Dynamic Behavior for Grinding Machines." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/r6h844.

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碩士
國立虎尾科技大學
機械與電腦輔助工程系碩士班
105
In order to pursuit low economic cost, high performance and high production efficiency for machine tools, the general trend has been to move towards the goal of high-speed and light-weight developing. However, the cutting performance of a machine-tool is closely related to its structural vibration. In order to obtain better grinding quality, there is a need further to investigate the rigidity and dynamic characteristics of the machine tools, to achieve a better reinforcement of the structural design of the machine tools and avoid structural vibrations. Generally, issues of vibration during the grinding processes may cause problems such as poor surface roughness and dimensional accuracy, even leading to a reduction of the machining accuracy and life of the machine tool. Therefore, the investigations of the structural stiffness and factors causing vibration of the machine-tool are the most important topic at present for machine-tool industry and related manufacturers. This study investigates the structural characteristics and dynamic behavior of a large gantry-type surface grinding machine and the small general surface grinding machine in a practical approach. First of all, the numerical and experimental modal analyses are performed for these surface grinding machine structures, and the structural characteristics and weaker zones of the important structure parts and whole systems are obtained. Comparisons are made between the results of the numerical and the experimental modal analyses to identify their differences, which form the basis for modifying the assumptions of the analytical model for numerical modal analysis and for subsequent improvement design on structures. Furthermore, the impact of the different geometrical configurations of spindle seat on the entire structure stiffness of the small surface grinding machine was examined. The modal parameters obtained from the experimental modal analysis were compared crossly to identify whether if the stiffness has been increased or not. Finally, in order to investigate the dynamic behavior of the small surface grinding machine during its grinding process, the grinding experiments were carried out through the accelerometer and microphone to detecting the dynamic response during the grinding processes. The results obtained from the experimental modal analysis indicate that there are two modes in which the structural resonance is easily to be excited in the large gantry-type surface grinding machine while there are three modes in which the structural resonance is easily to be excited in the small surface grinding machine within the possibly resonant vibration frequency range. According to the grinding experimental results, the faster feed rate and the larger grinding depth, the higher the vibration signals are and the poorer the surface roughness becomes.

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Kuo, Yu-Yuan, and 郭育源. "Research of Status Classification for CBN Grinding Process with Support Vector Machines." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/87313487184029011186.

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碩士
國立高雄第一科技大學
機械與自動化工程所
95
Grinding is a manufacturing processes utilized rotary abrasive wheel to generate quality surface. Wheel wears as grinding proceed. A dressing operation is needed to restore the wheel grinding ability as the abrasive particle of wheel worn out. In order to perform automation while keeping the surface quality, wheel status needs to be detected white workpiece is being ground, in order to confirm the guy quality, and decide the timing for dressing operation. The main objective of this research is to classify the status of CBN grinding process, while the process is being monitored. Acoustic emission signals and grinding power signals are selected for study, which correspond to the variation of abrasives in grinding process. As the signals were collected during the process, it was then classified with support vector machines based ground surface integrity. The relationship between grinding signals and ground surface were then build accuracy experimental result. The utilization of support vector machines method can efficiently obtain the grinding status model to correctly character grinding status. The model is then used to with regressive model for the result of support vector machines classification, the grinding surface roughness can then predicted with little error, this would be beneficial for grinding process monitor.

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Dissertations / Theses on the topic 'Grinding machines'

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