The pedestal of DM3500 die casting machine was analyzed to reduce the high manufacturing cost.The variable density topology algorithm and size optimization algorithm were applied.Stiffness of the pedestal under four different working conditions was calculated through finite element analysis and was used as constraint condition for topology optimization.Based on the element density contour

18 steel plates can be removed.Further on

the optimization model of the pedestal was built

and by analyzing the element thickness distribution contour

the final optimized design was determined.As a result

the comparison with the original design under the same working condition indicates that the stiffness and strength of the new design pedestal reach design criteria with 5.98 t weigh reduction

which is 31.6% weight reduce rate.