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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

A true generative CAPP system for DFM application to machined components /

Chiang, Charles Chi-Yu, January 1994 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 110-117). Also available via the Internet.
32

Machining characteristics of graphite/epoxy composite /

Wang, Duck Hyun. January 1993 (has links)
Thesis (Ph. D.)--University of Washington, 1993. / Vita. Includes bibliographical references (leaves [138]-143).
33

Analysis of the effect of process parameters on material removal rate in ultrasonic machining /

Wang, Hsueh-Ming Steve. January 1998 (has links)
Thesis (Ph. D.)--Lehigh University, 1999. / Includes vita. Bibliography: leaves 115-123.
34

Software tool for analysis of manufacturing processes (STAMP)

Mestry, Sanket Dilip. January 2002 (has links)
Thesis (M.S.)--West Virginia University, 2002. / Title from document title page. Document formatted into pages; contains xii, 81 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 73-74).
35

Residual stress modeling in machining processes

Su, Jiann-Cherng. January 2006 (has links)
Thesis (Ph.D)--Mechanical Engineering, Georgia Institute of Technology, 2007. / Committee Chair: Liang, Steven Y.; Committee Member: Garmestani, Hamid; Committee Member: Huang, Yong; Committee Member: Melkote, Shreyes N.; Committee Member: Neu, Richard W. Part of the SMARTech Electronic Thesis and Dissertation Collection.
36

Development of a variational part model using in-process dimensional measurement error /

Carlson, Shane A., January 2006 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Mechanical Engineering, 2006. / Includes bibliographical references (p. 87-88).
37

Development of a five-axis machining algorithm in flat end mill roughing /

Thompson, Michael B. January 2005 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Mechanical Engineering, 2005. / Includes bibliographical references (p. 71-74).
38

Global finish curvature matched machining /

Wang, Jianguo, January 2005 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Mechanical Engineering, 2005. / Includes bibliographical references (p. 73-75).
39

Estudo do uso de ferramentas cerâmicas na usinagem de inconel 718

Santos, Júlio César dos [UNESP] 20 December 2010 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:27:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-12-20Bitstream added on 2014-06-13T19:55:28Z : No. of bitstreams: 1 santos_jc_me_guara.pdf: 2742120 bytes, checksum: 52aec1b9d83e38bce13e92a3e9b66d10 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / A usinagem de superligas de níquel e ligas resistentes a altas temperaturas como o inconel 718 sempre representou uma tarefa difícil no chão-de-fábrica. Mas as aplicações industriais desses materiais passaram por rápida evolução nos últimos anos. Na indústria aeroespacial, o crescimento da popularidade destes materiais tem sido evidenciado na forma de palhetas de turbina, peças de compressor, suportes e elementos de conjuntos para aviação. Devido a suas propriedades e aos benefícios que trazem à indústria, o uso destes materiais se expandiu aos setores automotivo, médico, químico, indústria de miniaturas e outras indústrias. Para as superligas e ligas resistentes a altas temperaturas estima-se que a dificuldade na usinagem vai da combinação de forças de corte relativamente altas, combinadas com altas temperaturas que se desenvolvem durante o processo de usinagem. Estes níveis de calor podem causar a deterioração da aresta de corte, com quebras ou deformações. Os tipos comuns de desgaste de ferramenta para estes materiais são primeiramente reconhecidos como desgaste do flanco, entalhes e formação de arestas postiças. O presente trabalho consiste no torneamento cilíndrico externo da liga a base de níquel inconel 718, utilizando ferramenta cerâmica (Si3N4) visando à otimização da usinagem desta liga e buscando proporcionar aumentos reais de produtividade sem a necessidade de investimentos em novos meios de produção. Os ensaios de usinagem foram realizados em um corpo de prova da liga, considerando os parâmetros de usinagem: velocidade de corte, profundidade de usinagem e avanços próprios de acabamento. Os ensaios foram realizados em um torno CNC e ferramentas com pastilha de cerâmica à base de Nitreto de Silício Si3N4. Após cada etapa do torneamento foram realizadas as medidas do comprimento de corte, do desgaste das ferramentas e a rugosidade... / The nickel superalloys and resistant alloys machining to discharges temperatures as the inconel 718 always represented a difficult task in the job-shop. But the industrial applications of those materials went by fast evolution in the last years. In the aerospace industry, the growth of the popularity of these materials has been evidenced in the form of turbine blades, compressor parts, holders and elements of parts for aviation. Due to its properties and to the benefits that bring to the industry, the use of these materials expanded to the automotive sector, medical, chemical, in the industry of miniatures and other industries. For the superalloys and resistant alloys to high temperatures is considered that the difficulty in the machining is going relatively of the combination of high cutting forces, combined with high temperatures that grow during the machining process. These levels of heat can cause to deterioration of the cutting edge, with breaks or deformations. The types common of tool wear for these materials are recognized firstly as flank wear, incisions and formation of build up edge. The present work seeks to develop study of the machining for external cylindrical turning of the nickel base alloy inconel 718, using ceramic tool (Si3N4) seeking to the optimization of machining of this alloy and looking for to provide real increases of productivity without the need of investments in new production means. The machining tests were accomplished in a sample of the alloy, considering the machining parameters: cutting speed, cutting depth and own progresses of finish. The rehearsals were accomplished in a lathe CNC and tools with ceramic insert of Silicon Nitride. After each stage of the turning the measures of the cutting length were accomplished, of the tool wear and the roughness of the pieces (appraised in each phase of the process), with the aid of a portable roughness meter... (Complete abstract click electronic access below)
40

Estudo e caracterização do processo de usinagem do compóstio GLARE

Santos, Carlos Eduardo Figueiredo dos [UNESP] 09 November 2010 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:27:12Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-11-09Bitstream added on 2014-06-13T20:55:50Z : No. of bitstreams: 1 santos_cef_me_guara.pdf: 3218848 bytes, checksum: 3f5d62f5f34f564cf227356a6f346b8a (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Neste trabalho, foram analisados os resultados do processo de furação da chapa de GLARE®. O que motivou este estudo foi a necessidade cada vez maior para as empresas de realizar furos em materiais compósitos com brocas especiais e comerciais em quantidades cada vez mais crescentes. Outros fatores chamam a atenção em relação aos resultados obtidos a partir destas operações tais como: a qualidade das superfícies geradas na usinagem, o acabamento dos furos, geometria, deformação, tolerância dimensional e possíveis defeitos gerados. Neste estudo os testes foram realizados sem a presença de fluído refrigerante. Foram executados vários ensaios totalizando sete diferentes condições, e foi possível conseguir eliminar o defeito de delaminação, deformação, desfibramento e manter uma uniformização na usinagem dos furos. Foram identificamos os melhores parâmetros de furação com broca de metal duro inteiriça comercial, para o material compósito GLARE®. A velocidade de corte ideal para o material foi de 157m/min, nesta condição foi possível manter a ferramenta com sua integridade com o mínimo de desgaste por abrasão totalizando 248 furos e a ferramenta ainda com condições de continuar a cortar normalmente / In this work, the results of the drilling process of the GLARE® sheet were analyzed. What motivated this study it was the need every time larger for the companies of accomplishing holes in materials composites with special drills and you trade more and more in amounts growing. Other factors get the attention in relation to the results obtained starting from these such operations as: the quality of the surfaces generated in the machining, the finishing of the holes, geometry, deformation, dimensional tolerance and possible generated defects. In this study the tests were accomplished without the presence of cutting fluid. Several rehearsals were executed totaling seven different conditions, and it was possible to get to eliminate the delamination defect, deformation, disfibration and to maintain an uniformization in the holes machining. Were identified the best drilling parameters with integral cemented carbide drill from commercial trade, for the material composite GLARE®. The better cutting speed for the material was of 157m/min, in this condition it was possible to maintain the tool with its integrity with the minimum of wear for abrasion still totaling 248 holes and the tool with conditions of continuing to cut usually

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