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.

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