Abstract: Based on the assumptions of small deformation and simple load, an analytical model of cylinder shallow shell is constructed, and the curve direction spring-back after trimming are given theoretically. The distribution of surface deflection is studied through the experiment of drawing parts before and after trimming for the rectangle cylinder shallow shell. The evaluated indicator of surface deflection is presented theoretically. The mechanism of surface deflection compared with experimental results is analyzed. And the influence law of forming condition on surface deflection such as yield strength, curvature radius, sheet thickness, young’s modulus and tension is achieved, which give a basic reference for controlling surface deflection.

Key words: Cylinder shallow shell, Sheet metal forming, Spring-back, Surface deflection