Effects of the Embedding Depth on the Residual Stresses in the Brazed Cubic Boron Nitride Abrasive Grain

摘要

The purpose of this contribution is to investigate the effects of the embedding depth on the distribution of the residual stresses in the brazed CBN grain, thus the optimal embedding depth of grains on the working surface of the brazed CBN abrasive tools is determined. The results show that, the residual stress is stable without remarkable gradient in the core part of the brazed grain. The evolution of the stress distribution, however, is rather great in the special regions, such as both ends of the central axis, the margin region of the central plane in the CBN grain, and the margin region of the section plane between the grain and the filler top. The maximum tensile stress in the margin zone of the brazed CBN grain has the most important influence on the mechanical performance of the grains during machining, according to which the optimum embedding depth is determined as 30～40% of the total height of CBN grain crystal.