Analysis of the surface roughness after the sintered carbides turning with PCD tools

This paper describes the research results of surface quality after the sintered carbides turning (WC-Co turning) by the tools with edges made of polycrystalline diamonds (PCD). The research trials were conducted for tools with different nose radii and the influence of three independent parameters (vc, f, rε) on the surface roughness were analyzed. The impact of the binder material content Co (cobalt) on the surface quality during the WC-Co turning process (according to the values of surface roughness parameter Ra) is described further on. The values of vc, f, and rε at which the smallest surface roughness (for the particular work piece materials) could be achieved were defined. Based on the ANOVA variance analysis it was possible to find different effects of the research factors on the surface roughness (for the two types of sintered carbides shafts). For the shaft with 25% Co content, the significant influence is for two parameters: the cutting speed vc and the nose radius rε. For the shaft with 15% Co percentage content, the significant influence is only for the nose radius rε.