固定杠杆支点(图1),是铁路主货运车辆C62A敞车上的零件。原材料为12mm厚、65mm宽的轧制A_3条状钢板。该零件形状比较特殊,凹槽深而窄,下料长度长达752mm,因此,该零件的成形有一定的难度。按一般的设计经验,要分成两次双向弯曲成形,即首先将毛坯弯曲成U形,然后再在垂直于第一次弯曲方向上进一步弯曲成图示零件。由 Fixed lever fulcrum (Figure 1), is the main railway freight car parts C62A gondola. Raw material is 12mm thick, 65mm wide rolled A_3 strip steel. The shape of the part is quite special. The groove is deep and narrow. The length of the material is up to 752mm. Therefore, it is difficult to form the part. According to the general design experience, two-way bending is divided into two parts, that is, the blank is first bent into a U-shape, and then the bending part is further bent perpendicularly to the first bending direction to form the illustrated part. by