Methods of optimisation of sheet metal forming processes concerning the reduction of springback

Résumé

The final form of the parts in sheet metal forming, especially in U bending, is highly affected by the springback occurring when the material is set free of the forming constraints. Numerous studies aiming to control this phenomenon are conducted and there is still a degree of incertitude concerning the intensity of springback. As the analytical methods are not accurate, due to the complexity of the factors intervening, the development of the finite element methods proved to be a valuable tool. Still there are numerous differences between the results from the real physical tests and the results from simulations especially when it comes to estimation of springback. The present paper aims to propose a method that can be effective in reducing the springback with exemplification on U bended sheet metal parts.