工件在机床夹具中定位的定位误差计算是夹具设计中的一个重要环节。工件在夹具中定位时的标准位置选取是否得当,对于由定位而产生的定位误差有一定的影响。现举例说明如下: 例:加工一批图1所示零件的曲柄面C,要求保证C面与中心线O_1O_2平行。零件以一端d_1-δ_1mm在V形块中定位(V形块夹角为α),另一端d_2-δ_2mm支承在支承销上。中心距为Lmm。试分析这样定位时的 Workpiece positioning in the machine tool fixture positioning error calculation is an important part of the fixture design. The positioning of the workpiece in the fixture when the standard position is properly selected for the positioning error caused by positioning have a certain impact. An example is as follows: Example: Machining a group of parts shown in Figure 1 crank surface C, required to ensure that the C surface and centerline O_1O_2 parallel. Parts with one end d_1-δ_1mm positioning in the V-shaped block (V-shaped block angle α), the other end d_2-δ_2mm supported on the support pin. Center distance is Lmm. Try to analyze this positioning