Technical Paper
Generate Tooling Mesh by FEM Virtual Forming Model for Springback Compensation in Die Surface Design of Sheet Metal Stamping
1996-02-01
960592
An iterative FEM algorithm has been recently developed to compensate for springback in die surface design of sheet metal stamping. In each iteration of this algorithm, a new set of tooling mesh needs to be generated based on the part geometry after the so called “spring-forward” deformation. This geometry is represented by finite element mesh of the blank. Without CAD files, regular mesh generators can not handle the task. This paper presents a technique to generate such tooling mesh by means of a finite element calculation. After the spring-forward simulation, a virtual forming model is constructed. The virtual die and virtual punch are made from the part mesh with material changed from deformable to rigid. The virtual workpiece is generated by copying the die mesh and changing rigid material to deformable.