Experimental study on controlling technique of surface deflection

The surface deflection is an important disadvantage issue in the automobile outer panels forming. It can be controlled effectively through forming process. In this paper, a model of cylinder shallow shell is founded, and the measured method and evaluated standard of surface deflection for drawing parts are presented. The influence law of process techniques on surface deflection such as binder force, draw-bead, and shape of blank-hold surface is achieved, which give a basic reference for controlling surface deflection.