我厂利用普通三爪卡盘略加改进,先后制成多种(见图3)都是铝合金薄壁零件,原来采用专用夹具车削端面和内孔时,由于工件变形大,精度不易保证,操作也不方便。后来我们根据工件的不同特点,改变三个卡爪的形状和增加相应的附件,制成后壳三爪自定心车夹具(见图2)和中壳三爪自定心 I plant using ordinary three-jaw chuck slightly improved, has made a variety of (see Figure 3) are aluminum thin-walled parts, the original use of special fixture turning face and bore, the workpiece deformation, precision is not easy to guarantee, Operation is not convenient. Later, according to the different characteristics of the workpiece, we changed the shape of the three jaws and added the corresponding accessories to make the rear shell three-jaw self-centering car clamp (see Figure 2) and the middle shell three-jaw self-centering