这里介绍分 2个阶段在厚板上冲高精度孔的方法 ,如图 1所示。在第 1阶段 ,在毛坯上用带切削刃凸模冲出环形槽 ,其外径等于被冲孔直径 ,环形槽可在板坯的一侧或两侧冲制 (深度为 h1,h2 )。环形槽深图 1　 2阶段精密冲孔示意图度 0 .5～ 2 mm,宽度0 .5～ 1 .5mm。在第 2阶段 ,带 Here is divided into two stages in high precision punch plate hole method, shown in Figure 1. In phase 1, the blank is punched out of the ring with a cutting edge punch having an outside diameter equal to the diameter of the punch. The groove can be punched (depth h1, h2) on one or both sides of the blank. Ring groove deep Figure 1 2 stage precision punching Schematic diagram 0 .5 ~ 2 mm, width 0 .5 ~ 1 .5mm. In the second stage, with