Wear Rate of CBN Cutting Tool in Hard Turning of 100Cr6 Bearing Steel

The examination of wear and tool life of CBN cutting tools that are used for hard turning is an essential research topic, since the significant proportion of machining costs can be associated with the cutting tool. In this article we examined the wear of low CBN content cutting tool in the case of hard turning of 100Cr6 bearing steel (HRC=62 +/- 2). The experiments were carried out with constant depth of cut and feed rate at three different cutting speeds. The flank wear of CBN inserts were measured after predetermined number of passes. The measured flank wear values were described as a function of cutting time and the calculated wear rate as a function of flank wear. The average wear rates were shown at three different cutting speeds.