The effects of tooling imperfections on the initiation of wrinkling in finite element modeling of a deep drawing process

A brief review of the literature on wrinkling in deep drawing processes is presented. It is noted that, while there is a large body of literature rela ted to thin sheet, only one study related to thick sheet or plate has been identified. Finite element based models are used to investigate the effect of initial tooling imperfections on the initiation of wrinkling in deep dra wing of thick sheet. Two sorts of tooling imperfections, punch displacement and blank tilting, are considered. The simulation results are compared qua litatively to the experimental forming operation. it is confirmed that tool ing imperfections, in particular blank tilting, are an important type of im perfection governing the wrinkling behavior of the blank in deep drawing pr ocess.