Prediction of drawbead restraining force by FEM -study on drawbead restraining force in sheet metal forming II-

摘要

In a finite element simulation of a three-dimensional industrial sheet forming process the drawbead is not generally modeled by its actual shape. Since the sheet around the drawbead has a complex deformation, a very fine mesh is required tosimulate these drawbead forming phenomena, which increases the calculation time. It is very important to develop a practical but accurate method to model the drawbead effect, and to establish a method for estimating the restraining force as a function ofdrawbead geometry. In this paper it is shown that two-dimensional elastoplastic finite element code, ITAS-2D, can provide a sufficiently accurate drawbead restraining force for an arbitrary drawbead geometry without actual experiments. The results of this simulation improve our understanding of the drawbead forming process, and provide us with a very efficient method for obtaining the drawbead restraining force from the relation of the sheet angle in the drawbead cavity.