弯曲U形件的最常用回弹补偿方法是将弯曲角大于给定角,即增大一回弹角。依靠多弯一个回弹时的回弹补偿方法有下列几种。即修正凸模工作面间的α角;在凸模端面上做成圆弧形内凹;先由凸模运动弯曲冲件的中部,然后在最终弯曲工序中校直;弯曲并在过程最终阶段靠凹模向凸模方向移动而挤压冲件两直边;在凸模运动方向弯曲冲件的中心部分,然后在过程最终阶段校直。上述各种方法在某种程度上可以补偿回弹,但要作大量的调整工作。若材料的机械性能 The most common method of springback to bend a U-shape is to increase the bend angle by more than a given angle, ie by a springback angle. Rely on a multi-bend springback rebound compensation methods are the following. That is, the angle α between the working faces of the punch is corrected; a circular arc-shaped recess is formed on the end face of the punch; the middle of the punch is first bent by the punch and then straightened in the final bending process; Pressing the female die toward the punch presses the two straight sides of the punch. The center of the punch is bent in the direction of the punch movement and is then aligned at the final stage of the process. To a certain extent, the above methods can compensate for the rebound, but a great deal of adjustment work needs to be done. If the material’s mechanical properties