凹凸模具对多层金属板弯曲成型损伤的影响

INFLUENCE OF CONCAVE⁃CONVEX DIES ON BENDING DAMAGE OF MULTILAYER METAL PLATE

凹凸模具在对金属板料的弯曲加工成型工艺中占有重要的地位,其中凹凸模具的圆角半径也一直是弯曲件工艺设计的关键参数。多层金属板在弯曲加工中会出现单层金属板不存在的分层损伤现象,因此主要研究凹凸模具对多层金属板在弯曲加工中损伤的影响情况,通过改变相应模具参数来进行试验并使用有限元仿真来验证。结果表明,多层金属板在弯曲加工过程中会出现分层损伤的现象,而在不改变凸模的情况下,分层损伤的程度会随着凹模圆角半径的增大逐渐减小,多层金属板的弯曲成型效果越好。同时发现,当凹模圆角半径的数值等于凸模圆角半径与金属板材的厚度之和时,该多层金属板的弯曲成型性能最好,基本不会出现分层损伤的现象。

The concave⁃convex die plays an important role in the metal plate bending process,and the fillet radius of the concave⁃convex die is a key parameter in the design of the bending process.Due to the delamination damage of the single⁃layer metal plate during the bending process of the multilayer metal plate,this paper mainly studied the influence of the concave⁃convex die on the damage of the multilayer metal plate during the bending process,and the test was carried out by changing the corresponding die parameters and verified by finite element simulation.The results show that delamination damage occurs in the bending process of the multi layer metal plate.Without changing the punch,the degree of delamination damage will gradually decrease with the increase of the fillet radius of the die,and the bending effect of the multilayer metal plate is better.At the same time,it is found that when the fillet radius of the concave die is equal to the sum of the fillet radius of the punch and the thickness of the metal plate,the bending performance of the multilayer metal plate is the best,and there is basically no delamination damage.