零件加工假废品产生的原因及分析

在零件加工过程中,当工艺基准与设计基准不重合时,按转换后的工艺尺寸进行加工、测量,就会出现假废品的现象;通过实例,分析了假废品产生的原因和公差带的确定方法;并建立了多环尺寸链"假废品"区域的计算公式;指出了"假废品"的防止及减少影响的一些措施.

Analysis and Research on False Junks in Parts Manufacturing

During manufacturing,a phenomenon of the false junk will appears when the part is machined and measured by transited process dimension on the condition of craft datum and design datum non-coincidence.The cause of false junks,the determination of tolerance zone and the false junks zone formulations of multi-loop size of chain were give under the analysis of a example.Some methods to reduce or prevent the false junks were pointed out.