Dissertations / Theses on the topic 'Metal working'
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Nilsson, Maria. "Tribology in Metal Working." Licentiate thesis, Högskolan Dalarna, Materialteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:du-11730.
Full textGast, Christopher van der. "Microbial dynamics of metal-working fluids." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365323.
Full textPrince, Edmund Lee. "Fungal biodeterioration of synthetic metal working fluids." Thesis, University of Central Lancashire, 1988. http://clok.uclan.ac.uk/20019/.
Full textNilsson, Annika. "Modelling and simulation of metal working processes /." Luleå, 2000. http://epubl.luth.se/1402-1544/2000/41/index.html.
Full textTakahashi, Shinya. "Infusing machine made objects into traditional metal working." Virtual Press, 2005. http://liblink.bsu.edu/uhtbin/catkey/1313951.
Full textDepartment of Art
Pisoni, Attilio C. (Attilio Carlo). "A constitutive model for friction in metal-working." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12620.
Full textWang, Xifan. "Ideal Process Design Approach for Hot Metal Working." University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1375222977.
Full textBurton, Clare. "Respiratory disease in workers exposed to metal working fluids." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/8269/.
Full textBlake, David Matthew. "Cold working effects on mechanical properties in sheet metal joining for automotive applications." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/Fall2006/d_blake_112706.pdf.
Full textRimkus, Wolfgang. "Simulation and optimisation of the Interior High Pressure (IHP) manufacturing process using the Finite Element Method (FEA)." Thesis, University of Wolverhampton, 2000. http://hdl.handle.net/2436/90558.
Full textLiu, Chun. "Modeling of water and lubricant sprays in hot metal working." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196091214.
Full textMiller, Duncan. "Iron age metal working at the Tsodilo Hills, Northwestern Botswana." Doctoral thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/18277.
Full textGRESSEL, MICHAEL GERARD. "COMPARISON OF MIST GENERATION OF FLOOD AND MIST APPLICATION OF METAL WORKING FLUIDS DURING METAL CUTTING." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990120958.
Full textGoniwe, Nicholas Sandisile. "Simulation of a multi-stage forming process to investigate failure in the formed part." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2518.
Full textThe purpose of this study is the optimisation of the stamping analysis process in order to investigate the possible reasons for the part failure. (Altan & Vasquez, 2000) have conducted similar research to optimise a forming process. However, they focussed on dies for a forging process and in this study, we are looking at cold forming and this study is also different in that we are trying to reduce the number of stages while maintaining the formability. Formability is based on the dimensional conformance of the final part with additional criteria being the thinning, appearance of wrinkling, dynamic effects leading to the localisation of strain, cracking and residual stress. A numerical modelling procedure that is close enough to the real process is used to investigate the effects of changes in the frictional contact that would correspond to lubrication and also the effect of adding draw beads to the forming tools to change the frictional contact. We also investigated the effect of using a different material in terms of meeting the design requirements. Experimental results for comparison are available for certain of the stamping processes investigated that were tested in pre-production. The finite element simulation is used to account for all residual thinning, stress and strain of the multi-stage forming process to ensure optimum thickness changes of the sheet at each stage. The variations of material and manufacturing parameters are established to accurately predict the behaviour of this specific forming process. The material model required to meet physical experiments is deduced from the results of standard tensile tests and fitted to the Hill’s 48 Law for Work Hardening. The commercial packages Ls-Dyna with Dynaform and Pam-Stamp software are used for the simulation to produce 2 results for comparison.
Oyekanmi, B. O. "The determination of strain distributions in forgings." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383928.
Full textPalkar, Ashish Yudhishthir Harris Daniel K. "An experimental investigation of liquid metal MHPs." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Fall%20Theses/Palkar_Ashish_26.pdf.
Full textPalaniswamy, Hariharasudhan. "Determination of process parameters for stamping and sheet hydroforming of sheet metal parts using finite element method." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1195621470.
Full textDarbyshire, G. "Pre-Roman iron tools for working metal and wood in southern Britain." Thesis, Cardiff University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337305.
Full textSripathi, Prajwal Swamy Payton Lewis Nathaniel. "Investigation into the effects of tool geometry and metal working fluids on tool forces and tool surfaces during orthogonal tube turning of aluminum 6061 alloy." Auburn, Ala., 2009. http://hdl.handle.net/10415/1963.
Full textSabih, Amar. "Workability study for adiabatic shear band phenomenon in the steel cold heading process." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111856.
Full textTo achieve these goals, a comprehensive testing methodology and FE modeling, implemented within ABAQUS/Explicit, were established. This methodology includes an instrumented Drop Weight Compression Test (DWCT) tower equipped with a guided pocket die-set configuration capable of developing internal failure at different stages of ASBs and integrated metallographic inspection techniques. A validated FE model of the DWCT and guided pocket die-set configuration was a valuable tool in establishing the failure criteria and indicating the workability limits.
A detailed experimental and FE study for the ASB stages in the CH process was introduced to uncover the affect of different parameters controlling the failure mechanisms within the ASBs in the CH process. This study investigated the effect of the thermal, geometric and the material flow softening and hardening mechanisms affecting ASB evolution. Moreover, a detailed metallurgical and FE study of the internal ductile and Transformed Adiabatic Shear Band (TASB) failures caused by the ASB phenomenon in DWCT was conducted.
Three ductile failure criteria were introduced to predict the initiation and location of the internal ductile failure in the ASBs. One TASB failure criteria was introduced to predict the phase transformation to undesirable brittle martensite. These failure criteria were employed to establish integrated workability methodologies to indicate the objective workability limits.
Applying these workability methodologies on multistage CH FE models showed that these methodologies are an efficient tool to predict the damage levels and failure initiation locations within the cold-headed bolts. Moreover, these methodologies were successful in optimizing the die designs in order to reduce damage levels.
Wong, Kai-wing. "A CAD/CAM system for sheet metal blanking dies /." [Hong Kong : University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13204841.
Full textErcanli, Levent. "The Examimnation Of Metal Working Technology In Kultepe In Assyrian Trade Colonies Period." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614269/index.pdf.
Full textltepe where it was the center of the trade organization in Anatolia realized between Assur and Anatolia during 1945-1730 B.C called Assyrian Trade Colonies Period was one of the most important metal working center of Anatolia at that period. In this thesis, it is aimed to make a contribution to understand the metal working technology in Kü
ltepe by examining the uncovered metal artifacts dated to that period. For this purpose, the metal artifacts uncovered from Kü
ltepe Ancient Site belonging to Colonies Period which are exhibited in the Anatolian Civilization Museum were examined by portable XRF (PXRF) to obtain the quantity of elements that constituted the artifacts without giving any harm to the artifact. Besides the examination of exhibited artifacts in the Anatolian Civilization Museum, the uncovered metal artifact parts belonging to Colonies Period which are not suitable for exhibition and separated for studying were examined by energy dispersive X-ray unit of scanning electron microscope for elemental analysis and by X-ray diffraction for the analysis of minerals. The microstructures of artifacts were examined by scanning electron microscope and optical microscope for revealing the operations on metal applied by ancient metalsmith. In addition to analysis mentioned above, in order to make a contribution to understand the copper trade between Kü
ltepe and its environs lead isotope analysis of some samples from the separated metal artifacts for studying was also performed. As a result of all those analyses, it was concluded that Kü
ltepe ancient metalsmiths in Colonies Period had the knowledge to smelt the copper and to pour molten metal into a mold to produce an object of desired shape. Moreover, they also discovered that the addition of some elements to copper hardens the structure. In this frame the bronze to be obtained by deliberately adding of tin to copper was attained. In addition, they were aware of shaping the casted object by hammering. In the meantime, they had the knowledge of heat treatment that allows them forging the object many times till giving the desired shape without causing the fracture in the structure.
Moetakef-Imani, Behnam. "Model based die cavity machining simulation methodology /." *McMaster only, 1997.
Find full textLivelli, Mark Andrew. "Providing flow parameters for approximate die design models and the improvement and verification of those models using CFD analysis /." Online version of thesis, 2010. http://hdl.handle.net/1850/12222.
Full textHoldgate, Nicholas Michael David. "Peen mechanics in the shot peening process." Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/251562.
Full textFraser, Darren T. "Soldering in high pressure die casting and its prevention by lubricant and oxide layers /." [St. Lucia, Qld.], 2000. http://adt.library.uq.edu.au/public/adt-QU20010830.163828/.
Full textGrobaski, Thomas C. "Preliminary research for the development of a hot forging die life prediction model." Ohio : Ohio University, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1102695461.
Full textGlasse, Benjamin [Verfasser]. "Monitoring of Metal Working Fluid Emulsion Quality by in-process Light Spectroscopy / Benjamin Glasse." Berlin : epubli GmbH, 2015. http://d-nb.info/1074331206/34.
Full textBuers, Katy Louise Mary. "A treatment process for the degradation of metal-working fluids using mixed microbial cultures." Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242930.
Full textMedaska, Michael Kenneth. "The measurement of temperatures and forces in a turning operation with cutting fluid." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15983.
Full text黃啓榮 and Kai-wing Wong. "A CAD/CAM system for sheet metal blanking dies." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31210594.
Full textFrieman, Catherine. "Skeuomorphs and stone-working : Elaborate lithics from early metal-using era in coastal northwest Europe." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533810.
Full textArone, Miles. "Development of a tool management system for use in a mass production metal working facility." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12324.
Full textIncludes bibliographical references (leaves 148-149).
by Miles Arone.
M.S.
Kotze, Burger Adriaan. "The development of a design protocol for production of high speed coining dies." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-07032006-151623/.
Full textEndres, Matthew J. "Spray cooling of steel dies in a hot forging process." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0904102-141539.
Full textThompson, J. Kyle. "Study of powder metal press and sinter process and its tool wear." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-07062007-113955.
Full textItakura, Tomoya. "Synthesis and Characterization of Proton Conducting Coordination Polymers Working under Low-humidity Condition." Kyoto University, 2017. http://hdl.handle.net/2433/217993.
Full textBoysen, Christopher J. "An analysis and development of controls for exposures to maintenance personnel working on the plasma metal etchers." Online version, 1998. http://www.uwstout.edu/lib/thesis/1998/1998boysenc.pdf.
Full textYang, Lin. "Physiothermodynamics of lubricant application to hot die surfaces." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1117551258.
Full textTitle from first page of PDF file. Document formatted into pages; contains xviii, 178 p.; also includes graphics (some col.) Includes bibliographical references (p. 173-178). Available online via OhioLINK's ETD Center
Chitti, Babu Surendra. "Development of tailored preform processing technology for net-shape manufacturing of large monolithic structures." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4861.
Full textThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on January 31, 2008) Vita. Includes bibliographical references.
Chen, Zhong. "Cutting fluid aerosol generation and dissipation in machining process : analysis for environmental consciousness." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17929.
Full textBorsetto, Francesca. "Tribological performance of environmentally friendly solid lubricant coatings for sheet metal forming." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3427080.
Full textIn una società che diventa sempre più consapevole delle conseguenza che l’attività umana ha sull’ambiente, non è possibile ignorare l’impatto dovuto alle aziende manifatturiere. Queste ultime devono rispondere non solo a delle esigenze ambientali ma anche a degli obblighi di tipo economico e legislativo. Nello specifico, lo stampaggio di lamiera viene considerato come un processo che consuma non poca energia se viene considerato il peso del componente finito, al tempo stesso si tratta di un processo caratterizzato da un livello elevato di efficienza per quanto riguarda l’utilizzo di materia prima. Nonostante ciò l’esaurirsi delle risorse presenti in natura ed il livello preoccupante di inquinamento causati dal consumo di energia e di materia prima impone un’ulteriore riduzione dei consumi. La trasformazione di energia, materia prima e utenze in un prodotto finito o semi-finito è solo un aspetto dello stampaggio di lamiera. Oltre al pezzo da realizzare, tutte le fasi di produzione dal pre-trattamento del materiale, alla formatura, al post-trattamento producono anch’esse materiali residui o emissioni non voluti o pericolosi. Con particolare riferimento alla fase di formatura i lubrificanti di tipo liquido giocano un ruolo fondamentale essendo per la maggior parte nocivi nei confronti dell’ambiente e pericolosi da utilizzare da parte del personale. In aggiunta sono necessari agenti sgrassanti, solitamente nocivi, per pulire il pezzo finito. Al fine di ridurre l’impatto ambientale degli olii lubrificanti, e possibili strategie sono: • smaltimento • reciclaggio • riduzione • sostituzione • eliminazione Attualmente la pratica più diffusa è quella relativa allo smaltimento anche se non rappresenta una soluzione vantaggiosa né dal punto di vista economico né dal punto di vista ecologico; la riduzione ed ancora di più l’eliminazione dei lubrificanti liquidi dovrebbero essere perseguite laddove possibile. Sostenendo una politica di eliminazione negli ultimi anni sono state proposte diverse tipologie di rivestimenti solidi atti alla riduzione dell’attrito nello stampaggio di lamiera. In letteratura si trovano diversi risultati sperimentali relativi al loro comportamento tribilogico, in condizioni però tendenzialmente diverse da quelle tipiche di processo. Il presente lavoro di tesi si pone pertanto come obiettivo la caratterizzazione tribologica, in condizioni di processo, di tre sistemi di lubrificazione di tipo solido. Sono stati presi in considerazione due diversi casi industriali, imbutitura di acciaio inossidabile e stampaggio a caldo di acciaio altoresistenziale al boro. Con riferimento al primo sistema tribologico si è determinato il coeffciiente d’attrito in funzione di pressione normale, velocità di scorrimento, temperatura sia dell’utensile che della lamiera tramite test simulativo di tipo trip drawing. L’attrezzatura sperimentale in grado di realizzare tale tipologia di test è stata interamnente progettata e realizzata durante il periodo di dottorato presso i laboratori del DIMEG, Università di Padova. I risultati ottenuti per i due rivestimenti di tipo inorganico (CrN, CrN-DLC) depositati sul lato stampo sono stai peggiori di quelli ottenuti con gli stampi non rivestiti e lubrificati solo con olio. Ciò è stato probabilmente dovuto alla morfologia della superficie rivestita che va ottimizzata una volta effettuato il deposito del rivestimento stesso. Per quanto riguarda i rivestimenti organici, uno in particolar modo, ha dimostrato di essere un ottimo candidato per operazioni di stampaggio a secco dal momento che presenta un coefficiente d’attrito paragonabile a quello dell’olio. Con riferimento invece al sistema tribologico presente nelle operazioni di hot stamping, si è inizialmente studiata l’evoluzione sia chimica che morfologica del rivestimento Al-Si (depositato sulla lamiera) con i parametri termici di proceeso. Quindi si è analizzato il comportamento tribologico dello stesso in funzione di parametri quali la temperatura di test della lamiera, la pressione normale, la velocità di strisciamento e la rugosità dello stampo. Si è messo in evidenza come l’interazione tra pressione normale e temperatura abbiano un’influenza significativa sull’attrito all’interfaccia lamiera/stampo permettendo così un’ottimizzazione dei parametri di processo.
Sui, Ning. "Synthesis, characterization and optical properties of hybrid nanoparticles working with plasmon-fluorescence coupling." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00781927.
Full textDingle, Matthew, and mikewood@deakin edu au. "Elastic behaviour in mechanical draw presses." Deakin University. School of Engineering and Technology, 2001. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20051017.150247.
Full textФесенко, А. "Металлоискатель." Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/38883.
Full textPires, Gisele Puime. "Estudo sobre a estampabilidade, no estado solido, da liga de aluminio A5052 tixofundida, e viabilidade da sua tixoestampagem." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263647.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
These (docteur) - Universite de Savoie, Ecole Superiore D'Ingenieurs D'Annecy, France
Made available in DSpace on 2018-08-08T16:12:41Z (GMT). No. of bitstreams: 1 Pires_GiselePuime_D.pdf: 10020252 bytes, checksum: d17ac3ccc26b5a239dcb6fa99c211603 (MD5) Previous issue date: 2005
Resumo: Este trabalho apresenta estudo sobre a viabilidade da estampagem, no estado semisólido, de chapas da liga A5052. Inicialmente, para a obtenção de chapas tixofundidas, chapas comerciais laminadas foram submetidas ao processo de fusão parcial controlada, variando-se os parâmetros tempo e temperatura, com o objetivo de analisar a estampabilidade das chapas no estado sólido. Os parâmetros utilizados foram: fusão parcial a 627°C por 5 e 10 minutos, e 634°C, por 5 e 15 minutos, em chapas com 0,8 mm; fusão parcial a 624°C por 5 e 10 minutos, e 631°C por 5 e 15 minutos, em chapas com 2,0 mm; e fusão parcial a 625, 630 e 635°C por 15 minutos em chapas de 4,0 mm de espessura. As chapas foram caracterizadas com relação à microestrutura, sendo observada homogeneidade estrutural em toda a chapa. Também foram caracterizadas quanto às propriedades mecânicas, sendo que o material tixofundido (obtido por fusão parcial) apresentou diferenças significativas em relação ao material laminado. Para a caracterização da estampabilidade do material, foram feitos ensaios de Erichsen e obtidas curvas limite de conformação de chapas nos estados laminado, recozido e tixofundido, utilizando o método Marciniak e um método de análise de imagens para a obtenção das deformações principais da liga nos diferentes estados. Os resultados mostraram que o material tixofundido apresenta formabilidade semelhante à do material recozido. Foi buscada a caracterização do arranjo espacial de glóbulos em pastas tixofundidas; os resultados mostraram a presença de aglomerados tridimensionais de partículas com evidente interação entre elas, indicando a possibilidade da estrutura suportar esforços de tração. Portanto, para estudos da viabilidade de tixoestampagem, foi construída matriz com geometria tal a apresentar condições severas de conformação. As chapas foram tixoestampadas (temperaturas acima da solidus) e comparadas com chapas estampadas a quente. Observou-se que a tixoestampagem é um processo perfeitamente viável, levando a excelentes resultados de acabamento da peça e redução da força necessária para a obtenção do produto
Abstract: This work presents an analysis of the viability of drawing A5052 sheets in the semisolid state. Initially, to produce thixocast sheets, rolled commercial sheets were submitted to partial melting by different temperatures and holding times, to analyse the sheets draw ability in the solid state. The parameters utilised were: 627°C for 5 and 10 minutes, and 634°C, for 5 and 15 minutes, in sheets of 0,8 mm; 624°C for 5 and 10 minutes, and 631°C for 5 and 15 minutes, in sheets of 2,0 mm; and 625, 630 and 635°C for 15 minutes in sheets of 4,0 mm thickness. The sheets had their microstructure characterised; results showed high homogeneity of the structure throughout the test piece. Mechanical properties of the thixocast material (obtained by partial melting) were also characterised, showing significant differences when compared to the rolled condition. For drawing ability characterisation, Erichsen tests were performed and forming limit diagrams of the sheets in the rolled, annealed and thixocast states were obtained, using Marciniak's technique and image analysis to obtain the main deformations of the alloy in the different conditions. Results showed that the thixocast material shows good formability, similar to the annealed material. Characterisation of the spatial structure of thixocast slurry showed the presence of tridimensional agglomerates of globular solid particles, with evident interaction among globules, indicating the possibility of the structure to stand tensile stresses. Therefore, for thixodrawing tests, a die was especially designed to impose severe flow conditions. The sheets were formed by thixodrawing (temperatures above the solidus) and compared to hot drawing tests. It was observed that thixodrawing is a perfectly viable process, requiring lower forces than conventional solid processing and resulting in excellent finishing products
Doutorado
Materiais e Processos de Fabricação
Doutor em Engenharia Mecânica
Setia, Diarta. "Small and Medium Sized Enterprise(SME) in Social and Political Context: A Case of Metal-working Industry in Indonesia 1980s-2015." Kyoto University, 2018. http://hdl.handle.net/2433/235976.
Full textShirgaokar, Manas. "Technology to Improve Competitiveness in Warm and Hot Forging: Increasing Die Life and Material Utilization." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1205347635.
Full textGonçalves, Neto Luiz Maurício [UNESP]. "Aplicação de fluido de corte em quantidades reduzidas para usinagem do aço SAE 52100 no processo de retificação centerless de passagem." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/106658.
Full textA presente tese propõe dar uma contribuição para o estudo de aplicação de fluido de corte no processo de retificação centerless de passagem, comparando os efeitos causados em termos de integridade da peça retificada entre a técnica convencional e a técnica aprimorada desenvolvida para o uso racional dos fluidos de corte. As condições testadas foram as seguintes: retificação centerless de passagem utilizando rebolo de corte convencional (C120TB24), três condições de lubrirefrigeração, bocal convencional (BC), bocal multitubular utilizando emulsão (BME) e bocal multitubular utilizando simultaneamente emulsão e ar comprimido (BMEA). Vazão do ar comprimido 170 L/min, vazões da emulsão: 10 L/min, 20 L/min, 30 L/min e 40 L/min e remoção de material de 0,03 mm e 0,10 mm. As variáveis de saída estudadas foram a rugosidade da superfície retificada, o desvio de circularidade e a tensão residual. Além disso, foram realizadas análise metalográfica, análise por partículas magnéticas e ataque químico com ácido nítrico da superfície retificada a fim de identificar a ocorrência de danos térmicos. Em relação às três técnicas de aplicação de fluido de corte utilizados (BC, BME e BMEA) no processo de retificação centerless passagem, em geral, observou-se um melhor desempenho com a utilização do novo conceito de bocal multitubular desenvolvido. As melhores condições de retificação foram observadas utilizando o BMEA para as vazões de 30 L/min e 40 L/min e com o BME para vazão de 30 L/min, removendo 0,03 mm de material. Para essas condições o processo foi capaz de garantir a integridade das peças, pois não apresentam danos térmicos às superfícies retificadas e mantiveram-se os valores dos desvios de circularidade e rugosidade superficial recomendados para o processo de retificação. O método convencional (BC)...
This work aims to contribute to the study and application of cutting fluid in the process of through-feed centerless grinding, comparing the effects in terms of workpiece integrity between the conventional technique and the improved technique developed for the rational use of cutting fluids. The test conditions were as follows: through-feed centerless grinding using silicon carbide resinoid grinding wheel (C120 TB24), three conditions of lubri-refrigeration, conventional nozzle (BC), multi-tube nozzle with emulsion (BME) and multitube nozzle with emulsion and compressed air simultaneously (BMEA). Compressed air flow rate 170 L/min, emulsion flow rate: 10 L/min, 20 L/min, 30 L/min, 40 L / min and material removal from 0,03 mm to 0,10mm. The output variables studied were the roughness of the ground surface, roundness deviation and residual stress. Additionally, metallographic analysis were performed as well as chemical attack with nitric acid on the ground surface in oder to identify the occurrence of thermal damage. Regarding the three techniques of cutting fluid application (BC, BME and BMEA0 in the process of through-feed centerless grinding, in general we observed a better performance when using the new concept of developed multi-tube nozzle. The best grinding conditions were observed using BMEA for the flow ratesn of 30 L/min and 40 L/min and with BME for the rate of 30 L / min, removing 0,03 mm of material. Fo these conditions the process was able to ensure workpiece integrity, since there were not thermal damage to the surface that were ground and the deviation values of roundness and surface roughness recommended for the grinding process were kept. The conventional method (BC) showed thermal damage in the layer that was ground for all conditions tested and the residual stress values of the ground... (Complete abstract click electronic access below)
Gonçalves, Neto Luiz Maurício. "Aplicação de fluido de corte em quantidades reduzidas para usinagem do aço SAE 52100 no processo de retificação centerless de passagem /." Bauru, 2013. http://hdl.handle.net/11449/106658.
Full textBanca: Sandro Donnini Mancini
Banca: Rosemar Batista da Silva
Banca: Amauri Hassui
Banca: Manoel Cleber de Sampaio Alves
O Programa de Pós Graduação em Ciência e Tecnologia de Materiais, PostMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi
Resumo: A presente tese propõe dar uma contribuição para o estudo de aplicação de fluido de corte no processo de retificação centerless de passagem, comparando os efeitos causados em termos de integridade da peça retificada entre a técnica convencional e a técnica aprimorada desenvolvida para o uso racional dos fluidos de corte. As condições testadas foram as seguintes: retificação centerless de passagem utilizando rebolo de corte convencional (C120TB24), três condições de lubrirefrigeração, bocal convencional (BC), bocal multitubular utilizando emulsão (BME) e bocal multitubular utilizando simultaneamente emulsão e ar comprimido (BMEA). Vazão do ar comprimido 170 L/min, vazões da emulsão: 10 L/min, 20 L/min, 30 L/min e 40 L/min e remoção de material de 0,03 mm e 0,10 mm. As variáveis de saída estudadas foram a rugosidade da superfície retificada, o desvio de circularidade e a tensão residual. Além disso, foram realizadas análise metalográfica, análise por partículas magnéticas e ataque químico com ácido nítrico da superfície retificada a fim de identificar a ocorrência de danos térmicos. Em relação às três técnicas de aplicação de fluido de corte utilizados (BC, BME e BMEA) no processo de retificação centerless passagem, em geral, observou-se um melhor desempenho com a utilização do novo conceito de bocal multitubular desenvolvido. As melhores condições de retificação foram observadas utilizando o BMEA para as vazões de 30 L/min e 40 L/min e com o BME para vazão de 30 L/min, removendo 0,03 mm de material. Para essas condições o processo foi capaz de garantir a integridade das peças, pois não apresentam danos térmicos às superfícies retificadas e mantiveram-se os valores dos desvios de circularidade e rugosidade superficial recomendados para o processo de retificação. O método convencional (BC)... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This work aims to contribute to the study and application of cutting fluid in the process of through-feed centerless grinding, comparing the effects in terms of workpiece integrity between the conventional technique and the improved technique developed for the rational use of cutting fluids. The test conditions were as follows: through-feed centerless grinding using silicon carbide resinoid grinding wheel (C120 TB24), three conditions of lubri-refrigeration, conventional nozzle (BC), multi-tube nozzle with emulsion (BME) and multitube nozzle with emulsion and compressed air simultaneously (BMEA). Compressed air flow rate 170 L/min, emulsion flow rate: 10 L/min, 20 L/min, 30 L/min, 40 L / min and material removal from 0,03 mm to 0,10mm. The output variables studied were the roughness of the ground surface, roundness deviation and residual stress. Additionally, metallographic analysis were performed as well as chemical attack with nitric acid on the ground surface in oder to identify the occurrence of thermal damage. Regarding the three techniques of cutting fluid application (BC, BME and BMEA0 in the process of through-feed centerless grinding, in general we observed a better performance when using the new concept of developed multi-tube nozzle. The best grinding conditions were observed using BMEA for the flow ratesn of 30 L/min and 40 L/min and with BME for the rate of 30 L / min, removing 0,03 mm of material. Fo these conditions the process was able to ensure workpiece integrity, since there were not thermal damage to the surface that were ground and the deviation values of roundness and surface roughness recommended for the grinding process were kept. The conventional method (BC) showed thermal damage in the layer that was ground for all conditions tested and the residual stress values of the ground... (Complete abstract click electronic access below)
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