图1所示的工件上有12个大小、位置各不相同的孔,孔的分布较密,精度较高。若采用单孔钻模加工,由于工件多次装夹,加工孔的位置精度不易保证,加工效率也低;若采用多孔钻模加工,模具的设计和制造困难。鉴于上述情况,我们设计了一种极坐标钻孔胎具,能一次装夹完成12个孔的加工,它不是依靠压装在模板上的钻套,来控制工件上各 The workpiece shown in Fig. 1 has 12 holes of different sizes and positions, and the holes are densely distributed and have high precision. If single-hole drilling process, as the workpiece multiple clamping, the processing hole position accuracy is not easy to ensure that the processing efficiency is low; if the use of porous drilling die processing, mold design and manufacturing difficulties. In view of the above, we designed a polar coordinate drilling tool, which can process 12 holes at a time. It does not depend on the drill sleeve pressed on the template to control the workpiece