Description
When grinding brittle-hard polycristalline boron nitride (PcBN), high wear occurs on the grinding tool. The high wear is caused by the small difference in hardness between the PcBN and the diamond abrasive, as well as the higher hot hardness of the PcBN. This paper investigates the grinding behavior during peripheral traverse face grinding of PcBN with vitrified bonded diamond grinding tools. Therefore, the diamond grain shape, size and concentration are varied. The investigations are conducted with a PcBN specification with 70% cBN content. The grinding process is evaluated by analyzing both the process force components and the wear characteristics of grain, profile and edge wear. The results of this study reveal a significant influence of the diamond grain shape and size. For selected test points, a low profile wear G > 14 and edge wear rsk < 2·dg is observed.
