我厂加工某种电机外壳（见图１），同轴度和平行度要求较高，按照常用的胀芯夹具加工（图２和图３），发现仍有超差，采用改进的薄壁件胀芯车夹具后取得较好的加工效果，现分析如下：胀套内锥面与芯轴配合良好，胀套外径略小于工件下公差尺寸，能保证工件顺利套上，图２所示为 I plant processing a motor housing (see Figure 1), coaxial and parallelism higher requirements, in accordance with the common bulging fixture processing (Figure 2 and Figure 3) and found that there is still ultra-poor, the use of improved thin-walled parts Expansion of the core car clamp to obtain a better processing effect, are analyzed as follows: Expansion sleeve conical surface and the mandrel with a good fit, expansion sleeve diameter slightly smaller than the size of the workpiece tolerance, to ensure the smooth smoothing of the workpiece, shown in Figure 2