Avaliação do desempenho de ferramentas de metal duro no alargamento de guias de válvulas automotivas

• Ano de defesa: 2009
• Autor(a) principal: Lima Junior, Sebastião Gonçalves
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; BR; Programa de Pós-graduação em Engenharia Mecânica; Engenharias; UFU
• Palavras-chave em Português: Alargamento; Desvio geométrico; Aço sinterizado; Guia de válvula automotiva; Usinagem; Reaming; Geometric deviation; Sintered steel; Automotive valve guide; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/14842

Reaming is a machining process with relatively low cost and suitable when high quality holes are required. The purpose of this work is to evaluate the quality of the holes made in automotive valve guides, fabricated with sintered steel. This study was based on parameters of surface roughness, roundness and cylindricity deviations, obtained with uncoated carbide reamers. Cutting forces and vibrations in the system also were monitored. In order to determine the experimental tests, the Taguchi design was employed and the reamer geometry, cutting speed, feed rate and tool fixation method were varied. The results showed great influence of the tool holding method. The smaller roundness and cylindricity deviations were obtained using a four edge reamer, with pilot, fixed by hydro-mechanical mandrel and feed rate of 0,050 mm/edge. The used cutting speed range did not show significant influence.