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通过对不同硬度淬硬轴承钢ＧＣｒ１５的切削力、切削温度、已加工表面质量的切削试验研究，得到了被加工材料硬度对上述各量以及切屑形态、硬度、变形系数的影响规律，提出了临界硬度的概念，并得到了 ５０ ＨＲＣ为区分硬态切削与普通切削ＧＣｒ１５的临界硬度。
Through the cutting test on the cutting force, cutting temperature and machined surface quality of hardened bearing steel GCr15, the influence of the hardness of the material to be machined on the shape, hardness and deformation coefficient was obtained and the criticality The concept of hardness, and got 50 HRC to distinguish between the critical hardness of hard cutting and ordinary cutting GCr15.