experimental and numerical analysis of flange wrinkling of bimetal sheets in deep drawing process

in this paper, formation of wrinkling in bimetal deep drawing process has been investigated by the analytical, numerical and experimental methods. the effects of width of flange, fillet radii of matrix and punch, clearance of blank holder, contact conditions and relative thickness of two sheets on the number and height of wrinkle waves are studied. clearance and contact conditions have the greatest impact on the number of waves while only clearance has significant effects on the height of waves. increasing of the mandrel edge radius and relative thickness of tougher metal increase significantly the forming force. variation of holder’s clearance and matrix edge radius have a little effects on the punching force.