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.