(The PCBN tool is used to finish turning hardened steel, and its workpiece hardness is higher than 45HRC, which has the best effect. The cutting speed is generally 80-120m/min. The higher the hardness of the workpiece, the lower the cutting speed should be. For example, the cutting speed of a workpiece with a turning hardness of 70HRC should be 60-80m/min. The depth of cut of the finishing machine is 0.1～0.3mm, the feed rate is 0.05～0.025mm/r, the surface roughness of the workpiece after finishing turning is Ra0.3～0.6μm, and the standard precision can reach 0.013mm. like)
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