我厂生产的推拉开关电位器中的接触刷(图一),材料为铍青铜,料厚为0.15mm,尺寸精度要求较高。原由落料、打弯两副模具完成。落料模由冲孔、落料、凸包、打料四个工步完成,落下的零件要推回带料。因料薄,且三条宽为0.7mm的齿端要凸包,所以零件易从带料中脱出,生产不可靠。打弯模因需手工操作,所以生产效率低,安全性 I plant the push-pull switch potentiometer contact brush (Figure 1), the material is beryllium bronze, material thickness 0.15mm, high dimensional accuracy. Origin blanking, bending two molds to complete. Blanking die by punching, blanking, convex package, hit the material four steps to complete the falling parts to push back with the expected material. Due to the thin material, and the three width 0.7mm teeth to convex convex, so easy to strip parts from the material, the production is not reliable. Bending mold due to manual operation, so the production efficiency is low, safety