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The CBN insert B16 of Japan Special Ceramics Co., Ltd. mainly uses the cutting of cast iron parts. In the B16 insert, the CBN content is 85 Vol%, and the bonding agent is a special ceramic. Since the hard particles C, Si and the like in the cast iron are liable to cause scratches and abrasions of the cutter, the CBN content in the B16 is high, and the crystal grain diameter is also large, which is convenient for direct and tight bonding. The binder is made of a special ceramic with excellent heat resistance, which can improve the high-temperature performance of the blade and prevent the CBN particles from falling off due to a sharp rise in temperature during high-speed cutting. The disc rotor (FC2500) is machined with a B16 insert, and the tool life can reach 3,800 per cutting edge at V=700 m/min.