抄録
Since the reason why the wrinkling and breaking occurs is due to the situation, it is very difficult to make the secure measurement of shape and so in press forming. The forming process is designed mainly on the basis of expert's experience until now. In particular, the draw bead is used in order to prevent a wrinkling and breaking. In this paper, an optimum design is developed for determination of length and position of draw bead. The length and position of draw bead are chosen as the design parameters. The formability is evaluated by wrinkling and thickness uniformity of pressed part that is selected as objective functions. The experiments were made in the same condition with analysis. The results by experiments showed good agreement with those by simulations.
