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图1为一“T”形钢制零件加工工序图。该工序为在内圆磨床上加工。按图1的技术条件要求,该工序加工的内孔Φ7_0~(+0.015)“对图中标明的基准A_1和B_1同轴度不大于0.01,而加工的端面对基准A_1和B_1的垂直度不大于0.005。由于基准A_1定位面很短,基准B_1表面不完整,不能用如塑料夹具等一类高精度夹具定心夹紧。这是因为图中所示的“A_1”
Figure 1 is a “T” shaped steel parts machining process diagram. The process for the internal grinder on the processing. According to the technical condition of Fig. 1, the inner hole Φ7_0 ~ (+0.015) “in the process is not more than 0.01 to the reference A_1 and B_1 indicated in the figure, while the perpendicularity of the processed end surface to the reference A_1 and B_1 Not more than 0.005.Due to the short positioning plane of reference A_1 and the incompleteness of the reference B_1 surface, it can not be center-clamped by a type of high precision fixture such as plastic fixture, etc. This is because ”A_1"