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在机械加工中,由于设计基准与工艺基准不重合,对基准不重合的计算,一般按极值法用尺寸链计算,然后按其加工或测量,其中就伴随着“假废品”问题。对尺寸链中的各工序尺寸超差,又能被同一尺寸链其它组成环所补偿,把这种在理论上认为尺寸超差,而实际却能满足设计要求的零件,称为假废品, 在零件加工和检验过程中,如何确定工序尺寸的假废品区域,并通过相应计算以作为成品与废品判别的依据。本文就此问题进行较为详细的论述,在确定假废品区域的基础上给出了工序尺寸允许放宽的公差
In machining, because the design basis and the process of benchmarks do not coincide, the reference does not coincide with the calculation, according to the extreme value method is generally calculated by the size chain, and then press their processing or measurement, accompanied by “fake” issue. On the size chain in the process of the size of the ultra-poor, but also by the same size chain of other components of the ring compensation, the theory that the size of tolerance, while actually able to meet the design requirements of the parts, known as fake scrap, How to determine the fake scrap area of the process size during the parts processing and inspection, and through the corresponding calculation to judge the finished product and waste products. In this paper, a more detailed discussion of this issue, on the basis of the determination of the area of fake waste is given the size of the process allows to relax the tolerance