Abstract
In this paper , the forming process of muffler bracket is numerically analysed with the software ls-dyna3d . The metal flow law and deformation character under the curve blank-holding surface is revealed , the main reason of cracks and wrinkles appearing in the part during the forming process is studied , the direct reason of cracks at the pro-jecting corner of muffler bracket bottom is verified as the metal flow resistance is too large at the preformed flange cor-ner .The new technique that the pre-formation is finished by punch and die , the formation is finished by punch ,die and binder have been developed . The waste product ratio and substandard product ratio have been descended below 0.05. Thus the quality problem which has puzzled production for a long time is successfully solved by using numerical simula-tion technology , theory bases is offered for the designing of stamping and die of similar workpieces .