Abstract
Recently, the development of electric vehicles is active. For battery cases of electric vehicles, deep rectangular cup shape is required, it is necessary to improve the formability of press forming. Multistep forming is one way to improve formability. In previous studies, it was shown that there exists an optimum shape for the preform in cylindrical stretch forming, and the formability is improved by forming the target shape through the preformed shape. In this report, the effect of preform and blank shape on formability in multistep forming of rectangular cup deep drawing was examined by FEM and verified by trial.
