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机油泵壳体(图1,NJ-130汽车零件),其主要加工工序精镗齿轮孔、轴孔和车削底平面及端面,技术要求较高,原采用两工位180°回转转动盘夹具加工的,很难保证工件的端面和底平面的圆跳动精度要求,为此我们设计了偏摆夹具(图2)。夹具设计原理摆动盘10平面是工件定位的基准面,当它回转180°时必然产生端面圆跳动,其数值大小直接反映到孔和平面的加工精度上。若能用较小的回转角度获得理想精度要求,则其它问题即可解决。如图3所示,两齿轮孔O、O_1的
Oil pump housing (Figure 1, NJ-130 car parts), the main processing steps Fine boring gear hole, shaft hole and the bottom surface and the end face of turning, high technical requirements, the original two 180 ° rotary turntable fixture processing , It is difficult to ensure the accuracy of the circular runout of the end surface and the bottom surface of the workpiece. Therefore, we designed the yawing fixture (Figure 2). Fixture design principle Oscillating disk 10 plane is the workpiece positioning datum surface, when it is rotated 180 ° will inevitably produce end round beating, the value of the size directly reflects the processing accuracy of the hole and the plane. Other problems can be solved if the ideal accuracy can be achieved with a smaller slew angle. As shown in Figure 3, two gear holes O, O_1