Single point diamond turning of the tungsten carbide / Usinabilidade do carbeto de tungstênio no torneamento com ferramenta de diamante

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The single point diamond turning of the Tungsten Carbide is presented. The motivation for this study is the material´s high hardness and potential application for micromolds. A Tungsten Carbide sample was subjected to tests for determination of cutting parameters to achieve the ductile regime of material removal. Based on experimental results it was concluded that for the feedrate of the order of 1 müm/revolution, the depth of cut did not affect significantly the surface roughness and for federates of the order of 3 müm/revolution, the dept of cut influenced results of roughness greatly. Moreover chipping of the cutting edge occurs for depths of cut of 2 müm. The diamond machining of tungsten carbide tool using diamond proved to be a viable option for the production of surfaces in terms of optical quality, but due to the high hardness of this material (approximately 4000HV) showed to be limited for the production of components due to the low material removal rate. It is possible that the precision griding may provide higher material removal rates along with the acceptable surface quality. Therefore, to obtain a damage free surface in tungsten carbide with surface finishe in the order of 10 nm, cutting depth and feedrate should be smaller than 2,00 müm and 1,00 müm/revolution, respectively, using a new diamond tool with rake angle of 0 or - 25 degrees and precision high stiffness machine tool.

ASSUNTO(S)

tungsten carbide carbeto de tungstênio single point diamond turning usinagem de ultraprecisão ultra-precision machining torneamento com ferramenta de diamante brittle materials materias frágeis

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