我们在生产过程中,经常遇到有较高同轴度要求的零件。特别是在车削工序中,多以内孔定位车外圆、凸台或止口,并且要求加工部位对定位孔的回转中心同轴。根据产品结构的特点,有时对定位孔的尺寸公差不做严格控制。这样,在定位尺寸公差变化较大的情况下,采用定位心轴、弹簧夹头以及液性塑料夹具等是难以得到正确定位和可靠夹紧的,更达不到同轴 In the production process, we often encounter parts with higher concentricity requirements. Especially in the turning process, more holes to locate the car outside the circle, bosses or stops, and processing requirements of the positioning hole on the center of rotation coaxial. According to the characteristics of the product structure, sometimes the positioning hole size tolerances are not strictly controlled. In this way, in the case of large changes in positioning tolerances, the use of positioning mandrel, collet chuck and liquid plastic fixtures are difficult to get the correct positioning and reliable clamping, but also less than coaxial