图1所示为手扶拖拉机扶手架体上的80×260mm的椭圆形洞口,为提高强度和外观质量,决定按图2所示方法翻边,经过多次试验,最后用一套模具完成了冲孔、翻边和整形三道工序。模具结构见图3,压力机应具备缓冲垫。冲压前,先将已弯成(?)形并在底面压有凸台的工件放在 Figure 1 shows the hand-held tractor armrest body 80 × 260mm oval hole, in order to improve the strength and appearance of the quality, decided to flatter the method shown in Figure 2, after many tests, and finally completed with a set of mold Punching, flanging and plastic three processes. Die structure shown in Figure 3, the press should have cushioning. Before stamping, the first has been bent into (?) Shape and pressed in the bottom of the workpiece placed on the boss