使用压弯模弯制工件,所得的角度和圆角半径一般不可能与凹凸模型腔的几何形状完全一致,其原因在于:弯曲过程中除使金属改变形状、产生塑性变形外,必然还存在弹性变形,当凹凸模分离后,弯曲部分多数由塑性变形保存下来,而在凹凸模受力作用下产 The use of bending mold bending workpiece, the resulting angle and radius of the radius of the concave and convex cavities are generally not exactly the same geometry, the reason is that: in addition to bending the metal to change shape, plastic deformation, there must be still elastic Deformation, when the punch and die separation, the majority of the curved part of the plastic deformation preserved, and in the punch under the force produced