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我厂在1962年访问用户时,用户反映,千分尺容易失去精度。于是党委组织研究分析,主要是千分尺螺杆的硬度低,容易磨损,精度失准。螺杆是千分尺的关键件,材料为GCr15,螺纹的精度要求为:螺距的相邻误差不超过0.002毫米,累积误差不超过0.002毫米,中径锥度和椭圆度不超过0.003毫米。由于我厂没有精密螺纹磨床,只好采用车制工艺,因此精度达不到要求,报废率达40～50％;同时,车制后不能进行热处理,硬度低。经分析,如果采用淬
When I visited the user in 1962, the user reflected that the micrometer easily lost accuracy. So the party committee to organize research and analysis, mainly micrometer screw hardness is low, easy to wear, accuracy inaccurate. The screw is the key piece of the micrometer. The material is GCr15. The accuracy requirement of the thread is: the adjacent error of the pitch is no more than 0.002mm, the accumulated error is no more than 0.002mm, the diameter taper and the ovality are no more than 0.003mm. Because I plant without precision thread grinder, had to use the car system, so the accuracy of less than the required rate of 40% to 50% scrap; the same time, after the system can not be heat-treated, low hardness. After analysis, if used quenching