Variação dimensional e microestrutural do aço AISI 4140 e peças usinadas por torneamento

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Dimensional deviation and surface quality are fundamental components for mechanical applications. The variables that influence these factors, the quantity of heat generated must be reduced in order to minimize their effects on tool and on the superficial and sub-superficial structure of the piece. Reducing this heat and its effects is one of the cooling functions; however, the researches trying to restrict the use of those fluids. In this work, the cooling efficiency was analyzed on the surface quality, dimensional deviation and microstructural variation of AISI 4140 steel samples machined with different microstructure by longitudinal turning process. As a result, it was found that the cooling is not a significant effect on surface quality, not improving the roughness. In regard to dimensional, it was noticed in more than 60% of tests that the results with and without the presence of cooling kept between the pre-specified tolerance ranges. In the microstructural analysis, analyzing the plastic deformation, it was noticed that the hardness decrease in the edge of the sample, comparing with the center.

ASSUNTO(S)

rugosidade metalworking engenharia de materiais e metalurgica diâmetro lubri-refrigeração microstructure usinagem roughness cooling aço steel diameter microestrutura

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