Performance evaluation of carbide tools on automotive valve guides reaming / Avaliação do desempenho de ferramentas de metal duro no alargamento de guias de válvulas automotivas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

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.

ASSUNTO(S)

desvio geométrico automotive valve guide engenharia mecanica guia de válvula automotiva geometric deviation usinagem alargamento reaming aço sinterizado sintered steel

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