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根据GB1214—75规定:游标卡尺量爪测量面的硬度应不低于HRC58。但我厂生产的卡尺量爪测量面的硬度,曾在较长时间内不稳定;原来以为是热处理淬火有问题,便将量爪测量面淬火工艺由HRC58～62改为HRC59～63。而事实是,热处理后量爪测量面的硬度达到工艺要求,但出厂的游标卡尺量爪测量面硬度仍不稳定。究竟是什么因素促使硬度下降呢?游标卡尺是用T_8碳素工具钢制成的。碳素工具钢淬火后,其机械性能随回火温度不同而
According to the provisions of GB1214-75: vernier caliper measuring surface hardness of not less than HRC58. However, the hardness of caliper and caliper measurement surface produced by our factory was unstable in a long period of time. It was originally thought to be a problem of heat treatment and quenching. We changed the measuring surface quenching process of HRC58 ~ 62 to HRC59 ~ 63. The fact is that after heat treatment, the hardness of the measuring surface of the claw reaches the technical requirement, but the hardness of the measuring surface of the vernier caliper is still not stable. What are the factors that led to decline in hardness? Vernier caliper is made of T_8 carbon tool steel. Carbon tool steel after quenching, its mechanical properties with the tempering temperature