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我们厂生产的多品种精锻锥齿轮。其中精锻“泰山－12”半轴齿轮（泰山－12型拖拉机用齿轮）在拉内花键孔工序前需对其内孔和大端面进行精车加工。该工序的尺寸及精度要求如图1所示，齿形定位采用普通车床分别加工其内孔和大端面，由于存在着较大的两次定位误差，不能保证椅车后
Our factory produces a variety of precision forging bevel gear. The precision forging “Taishan -12” side gear (Taishan -12 tractor gear) in the hole before the Rafah keyhole hole bore hole and the large end surface for fine car processing. The size of the process and the precision requirements shown in Figure 1, the tooth-shaped positioning using ordinary lathe machining their inner holes and large end face, due to the existence of a large two positioning errors, can not guarantee the chair after the car