Simulation-based Prediction Model of Draw-bead Restraining Force and Normal Force

Abstract

This paper deals with the simulation-based prediction model to predict the restraining force and the normal force of draw-beads in sheet metal forming process. The modified DOE method is newly proposed in order to construct a prediction model for the equivalent draw-bead and finite element analysis is utilized to calculate equivalent draw-bead forces in each design case. The reliability of the finite element analysis is verified by comparing with the experiment. To increase the accuracy of prediction models, a special technique is applied for normalizing the estimated force in each design case. Finally, the accuracy of constructed prediction models is verified by comparing the predicted result with the experimental result. It demonstrates that the simulation-based prediction model can provide accurate equivalent draw-bead forces. The prediction model constructed can not only provide the restraining and the normal force conveniently with respect to the draw-bead design for the simulation of sheet metal forming process, but also be utilized to determine the dimension of draw-beads at actual die design.