最近我厂在制造工具过程中,遇到一个带有内凸螺旋槽的零件,如图1。经有关同志建议,采用一种新方法加工,试制后经过鉴定,质量良好。现简介如下:加工前先准备一只供压制用的专用心轴(图2)和专用套筒(图3)。心轴用 CrWMn 合金钢制造,并淬火至 R_C53～57;套筒用45号普通结构钢或铸铁制 Recently I plant in the process of manufacturing tools, encountered a convex spiral groove with parts, shown in Figure 1. Proposed by the relevant comrades, the use of a new method of processing, after the trial after the identification, good quality. The brief introduction is as follows: Before processing, prepare a dedicated mandrel for pressing (Figure 2) and a special sleeve (Figure 3). The mandrel is made of CrWMn alloy steel and hardened to R_C53-57; the sleeve is made of normal structural steel No. 45 or cast iron