The mechanism and control research on side-wall curl of automobile HSS body panels

Analysis method on wall wrinkling of conical parts based on reverse moulding;

The major shape of side wall curl is described,and three kinds control methods for side wall curl are introduced: step flange line,strengthening rib and technology control.

Based on experimental and theoretical analysis, a new viewpoint of which a comound curling chip is easier to break than a up curling chip or if the degree of side curling is higher than that of up curling in the compound curling it is aslo easier to break than a side curling chip has been put forth in this paper,and the conditions of producing the compound culing chip have been investigated.