几种典型尺寸链的计算

在机加工中，当工艺基准（工序、定位、测量等）与设计基准不重合时，工序基准就无法直接取用零件图上的设计尺寸，因此必须进行尺寸换算来确定其工序尺寸。对于要求进行表面处理的零件，在加工中要提前计算相关的工序尺寸。工艺尺寸链的构成，取决于工艺方案和具体的加工方法。文中根据尺寸链原理绘制了尺寸链图，根据尺寸链图例计算，求得所需要的尺寸。

Some Typical Calculation Methods for Dimension Chain

In machining process,the process datum and the design datum are often not same,which need to convert design sizes into process sizes.For the parts which need surface treatment,procedure sizes should be calculated before the surface treatment.The composition of process dimension chain depends on technology schemes and processing methods.The key to dimension chain calculation lies in identifying the closing link which is got in procedure processing indirectly,the paper makes drawing and calculates according t...