三 弯曲件级进模的下模设计 弯曲件级进模的下模是由两部分凹模组成,即一部分凹模对工件进行冲裁,另一部分凹模对工件进行弯曲变形。这两部分的凹模在使用过程中又出现不同情况,对于冲裁变形的凹模部分,随着不断地冲压其刃口需经常进行修磨。而进行弯曲变形的凹模则没有这种现象。由于冲裁凹模与弯曲部分的凹 The design of the lower mold of the progressive bending die with three bending parts The lower mold of the bending progressive die is composed of two parts of the concave mold, that is, part of the concave mold punches the workpiece and the other concave mold performs the bending deformation of the workpiece. The two parts of the die in the course of the re-emergence of a different situation, the punching deformation of the die part, with the constant punching of its cutting edge to be frequently carried out grinding. The concave deformation of the die is not the phenomenon. Due to blanking the concave of the die and the curved portion