Draw Bead Geometry Optimization on Springback of Sheet Forming

The effect of springback during forming is the main concern. Although it was studied and found that the variable blankholder force reduces this effect for some operations it was not enough due to part complexity. In such cases the draw bead is used to control the redundancy and the spring back. In addition to this many studies performed on this topic showed that there is no standard method to determine the blankholder force trajectory. In this study the parameters of draw bead were optimised together with an orthogonal experiment design for a complex part by using FEM software. The parameters investigated are the three important radius of draw bead. The effects of these parameters are optimised by using Annova and response surface regression methods. The optimised parameters were used in the final model and then the punch and die are manufactured. Finally experiments were done to prove the accuracy of optimisation.

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