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第一类工艺尺寸是由于工艺要求,改变了零件图上的尺寸注法而形成的。现在我们用生产实际中的例子来说明它的计算方法。例一图1-3 a所示的零件,它的加工情形已在前面讲过了,试求工艺尺寸A~+(?)aA解:因为是大批生产,采用调整法加工,铣刀必须预先调整到一定的位置。对于尺寸10~+0.8来说,它的设计基准是表面1,但定位基面却是表面2,只能按工艺尺寸A~+(?)A、来调整夹具上定位元件相对于铣刀的位置。也就是说,在这个工序中,我们是直接保证尺寸A~+(?)A。至于尺寸10~+0.8,我们没有
The first type of process size is due to process requirements, changing the size of the parts on the map Note formed. Now we use the actual production example to illustrate its calculation method. Example 1-3 a shown parts, its processing has been talked about before, try to process size A ~ + (?) AA solution: Because it is a large number of production, the use of adjustment method of processing, milling cutter must be in advance Adjust to a certain position. For size 10 ~ + 0.8, its design basis is surface 1, but the positioning of the base surface is 2, only the size of the process A ~ + (?) A, to adjust the fixture on the positioning element relative to the milling cutter position. In other words, in this process, we are directly guaranteed size A ~ + (?) A. As for the size of 10 ~ +0.8, we do not have