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零件加工的形位误差是影响产品质量的一个重要因素。为了保证产品质量、对产品的主要零部件的形位误差必须提出相应的要求。如零件的阶梯孔,两端孔对中间小孔,外圆对内孔,或内孔对外圆的轴线的同轴度,这类零件有的不是一次加工完成,有的是第二次装夹,这样,同轴度误差就不易保证,但因没有测量同轴度的夹具和仪器,对加工的零部件的实际误差测不出来,工艺方法得不到验证,只能在装配后试验才能发现问题,造成装配返工。因此,
The error of shape and position of parts processing is an important factor affecting product quality. In order to ensure product quality, the main components of the product of the shape of the error must be made to the corresponding requirements. Such as parts of the ladder hole, hole on both ends of the hole on the middle of the hole to the hole, or bore coaxial with the axis of the outer circle, some of these parts is not a complete processing, and some are the second folder, so , The coaxial error is not easy to guarantee, but because there is no measurement of coaxial fixture and instrument, the actual error of the processing of components can not be measured, the process can not be verified, only after the assembly test to find the problem, Resulting assembly rework. therefore,