用普通弯曲模压弯U形件,成形过程中,工件与凹模模口及侧壁有滑动摩擦,因而模具容易磨损,工件表面也容易划伤。当工件尺寸精度要求较高时,为了保证U形件两侧边的平直度及减少回弹量,就需要减小凸、凹模之间的间隙。这样,模具寿命和工件划伤问题就更显得突出。 Bending U-shaped parts with ordinary bending, the forming process, the workpiece and the die die and the sidewall sliding friction, so easy to wear mold, the workpiece surface is also easy to scratch. When the workpiece dimensional accuracy is high, in order to ensure the flatness of both sides of the U-shaped pieces and reduce the amount of rebound, you need to reduce the gap between the convex and concave mold. In this way, die life and workpiece scratches even more prominent.