固定耳零件如图1所示,为成都某厂冲压车间的主要零件之一,年产量约300万件。零件材料为A3钢,料厚1.5毫米。该零件的生产工序为落料——成形——弯曲——冲矩形孔(12×10)和小孔(φ2),小孔离弯曲线和零件边缘1毫米,矩形孔和小孔同时冲出。设备为J11-5偏心冲床,精度不高。长期以来,生产中存在的主要问题是小孔凸模崩刃和折断,事故损坏和早期失效要 The fixed ear parts are shown in Figure 1, which is one of the main parts of a factory stamping shop in Chengdu. The annual output is about 3 million pieces. Parts of the material is A3 steel, material thickness 1.5 mm. The parts are blanking, forming, bending and punching rectangular holes (12 × 10) and small holes (φ2). The holes are 1 mm away from the bending line and the edge of the part. . Equipment for J11-5 eccentric punch, accuracy is not high. For a long time, the main problems in the production of small punch punch chipping and breaking, accident damage and early failure to