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在我公司引进美国卡特彼勒公司图纸生产的推土机中，有一种被称为多臂曲柄的零件，如图1所示。图1 该零件的毛坯为铸钢件，外形尺寸不规则，而要加工的四个孔的直径及中心距都有一定的要求。如果通过划线加工各孔，不但效率很低，而且质量难以保证。以往我们加工的摇臂多?
Among the bulldozers that our company imported from the drawings of Caterpillar Inc. in the United States, there is a part called a dobby crank, as shown in Figure 1. Figure 1 The parts of the castings for the castings, the shape size is irregular, and to be processed four holes diameter and center distance has certain requirements. If the hole through the scribing process, not only inefficient, but difficult to guarantee the quality. In the past we have more rocker processing?