《机械制造》1987年第2期刊载了齐立同志译自《American Machinist》的《车较长管类零件的胀力芯轴》一文。该文介绍的胀力芯轴使用方便,可以一刀车削较长管类零件外圆柱面,且能保证内径与外径的同轴度等等。但是,笔者想补充一点意见:此类胀力芯轴(图1)不宜用来精车长管类零件,尤其是薄壁长管类零件。众所周知,薄壁工件在胀力作用下必产生径向扩张弹性变形。因为工件很长且壁很薄,所以在不受胀 Machine Manufacturing, No. 2, 1987, published a paper entitled “Expansion Mandrel for Long Tube Parts of Vehicles” by American Qi Qili translated by Qi Li from American Machinist. This article describes the expansion of the mandrel easy to use, you can turn a long knife tube outer cylindrical surface, and to ensure that the inner diameter and outer diameter of the coaxiality and so on. However, I would like to add a bit of advice: such expansion mandrel (Figure 1) should not be used to fine car long tube parts, especially thin-walled long tube parts. As we all know, thin-walled parts in the expansion force will have a radial expansion of elastic deformation. Because the work piece is very long and the wall is thin, it is not inflated