图一所示是三合一工序图,材料10号钢。原工艺分冲凸成形,冲孔,冲翻边孔三道工序来完成。在冲凸成形后片子外形由于起伏成形已经变形,所以继续以外形为基准已经失去作用。用冲凸成形部位来作定位基准,它的稳定性很差,冲出的四孔对尾部的不对称度小于0.10毫米难以达到。所以四个翻边孔就达不到工序的要求。影响了成形弯 Figure 1 shows the three-in-one process diagram, material No. 10 steel. The original process points punch forming, punching, punching the hole three processes to complete. After punch forming, the profile of the sheet has been deformed due to the undulation, so it continues to lose its function on the basis of the profile. With the punch forming parts for the positioning of the benchmark, its stability is poor, out of the four holes of the tail asymmetry less than 0.10 mm is difficult to achieve. Therefore, the four flange holes to reach the requirements of the process. Affect the forming bend