我厂加工锭脚螺帽用的丝锥,原为整体高速钢制成;这种丝锥的柄部比一般丝锥的长,所以浪费很多高速钢。最近王仁昌老师傅改进了装配式丝锥(如附图),它由高速钢头部1及中碳钢柄部2组成。两者由圆柱部分(φ14A/c)定位,由螺纹连接;圆柱部分及圆孔,均需经过磨削。件2上的内螺纹的外径、中径和内径,均按理论尺寸加大0.15～0.20公厘,以弥补线锥热处理后螺纹部分所产生的弯曲变形。丝锥头部应淬硬到RC62～65,杆部应淬硬到Rc20 I plant processing spindle nut with a tap, the original high-speed steel made of the whole; this tap handle than the average length of the tap, so a lot of high-speed steel waste. Wang Renchang teacher recently improved assembly type tap (pictured), which consists of high-speed steel head 1 and 2 carbon steel handle. Both are located by the cylindrical part (φ14A / c) and are connected by threads. Both the cylindrical part and the circular hole are to be ground. The outer diameter, inner diameter and inner diameter of the internal thread on the part 2 are all increased by 0.15-0.20 mm according to the theoretical size to compensate for the bending deformation caused by the thread part after the heat treatment of the thread cone. Tap head should be hardened to RC62 ~ 65, the rod should be hardened to Rc20