Finite element simulation and experimental test on warm deep drawing technology of AZ31 magnesium alloy

The warm deep drawing of magnesium alloy AZ31(3% Al,1% Zn,mass fraction) sheets was studied by both the experimental approach and finite element analysis.Finite element analyses are performed to investigate the effects of the process parameters on the drawability of rectangular cups and to predict the formation of the process defects.Sound cups can be formed at 200 ℃ and 250 ℃ by the forming limit diagram and the thickness distributes very well at 200 ℃. There is no fracture when the punch speed is 18 mm/min,and on punch corner there is crack when the speed is 66 mm/min and 180 mm/min.The formability of the AZ31 sheets can be improved significantly at elevated temperatures. Temperatures and punch speeds have significant effects on the drawability of square parts.The reasonable agreement between the numerical simulation results and experimental results validate the accuracy of the finite element analysis.