In the processing of CBN inserts for high chromium, high nickel, high vanadium and other alloy cast iron materials, the
working layer contains a lot of high hardness carbide, the cutting process has a scratch effect on the solid cbn inserts
edge, and the gap of the cutting edge appears. For a long time and the continuous impact of the cutting, the increase
of the gap, and ultimately the pcbn inserts is difficult to bear, causing the cbn turning inserts to break.