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金属条料端部的叠边,通常需用两套冲模分别进行两道工序的操作才能完成。然而,图中所示的冲模可用来进行两道冲压工序中的任一操作:在第一道工序(左),条料由水平状态被弯至135°;随后用手工再次把工件放到退料板上,进行第二道工序(右),完成制件端部叠边。冲模的工作过程如下。首次向下行程时,弯曲凸模先把工件紧压在由弹簧支承着的退料板上,金属条料由于被它推着通过弯曲滑块的端部而被压弯成90°。接着,斜楔把弯曲滑块推向右方,使条料弯成135°。随后冲模返回原始位置,弯曲滑块也由弹簧复位。然后在第二
Stacking of the ends of the metal strip usually requires two sets of punches to perform two operations respectively. However, the die shown in the figure can be used to perform either of two punching operations: In the first pass (left), the strip is bent from a horizontal state to 135 °; the workpiece is then manually put back The material board, the second process (right), complete the stack end of the workpiece. Die work process is as follows. On the first downward stroke, the bending punch first presses the work piece against a spring-loaded stripper plate which is bent to 90 ° as it is pushed through the end of the curved slider. Then, the wedge pushes the curved slider to the right, bending the strip to 135 °. The die is then returned to its original position, and the curved slider is also reset by the spring. Then in the second