我厂生产的氢气压缩机缸套材料为38CrMoAIA，内外直径同轴度为φ0．025mm。为达到零件同轴度要求，工艺过程为先磨内孔，以内孔为基准用内胀式弹簧夹头胀紧零件，再用磨床四爪卡盘夹紧弹簧夹头来加工外圆。一、内胀式弹簧央头的结构内胀式弹簧夹头的结构如附图所示。弹性套筒6 Hydrogen compressor cylinder liner material of our factory is 38CrMoAIA, coaxiality of inside and outside diameter is φ0.025mm. In order to meet the requirement of concentricity of parts, the process is to first grind the inner hole, expand the part with the inner expansion spring collet with the inner hole as a reference, and then process the outer cylinder with a gripper of the collet with a four-jaw grinder. First, the inner structure of the expansion spring The inner structure of the expansion collet as shown in the figure. Flexible sleeve 6