我公司在设备维修时需加工如图 1所示的齿轮，考虑采用铣齿工艺，铣齿前其内孔尺寸为 40 ，若采用图 2所示的传统实体芯轴定位夹紧，则加工后测得的齿轮齿圈径向跳动误差Δ Fr超差。经分析认为误差主要由芯轴与齿轮内孔之间的安装间隙所造成的，为此，我们设计了一种胀力夹 I need to process the equipment maintenance gear shown in Figure 1, consider the use of milling technology, milling the tooth before the hole size is  40, if the traditional solid mandrel positioning shown in Figure 2 clamping, the processing After measuring the gear ring radial runout error Δ Fr tolerance. The analysis shows that the error is mainly caused by the installation gap between the mandrel and the gear bore. Therefore, we designed a kind of expansion clamp