Generating Mechanism and Controlling Technique on Surface Deflection of Cylinder Shallow Shells

Sun zhenzhong  yang yuying

(School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001)

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

CLC No: TG315.2

Received 20040826, received in revised form 20041223