Abstract:Choosing inner-door panel of auto as an example, the two-stage deep drawing of complex sheet metal was studied. By using CAD software UG and numerical simulation software DYNAFORM, the characteristic of the CAD modeling of the simple workpiece and the complex sheet metal, finite element modeling and the selection of parameters were analyzed. The effects of three important material parameters such as yield stress, strain hardening exponent and normal anisotropic parameter on the formability of the two-stage deep drawing of inner-door panel of auto were investigated. The results show that the yield stress has large influence on the increase of thickness, while the strain hardening exponent has little effect on the thickness change. Otherwise, larger normal anisotropic parameter can result in a better formability of the sheet.

Key words:  inner-door panel of auto； complex sheet metal； two-stage deep drawing； numerical simulation