Study On The Deep Drawing Of AZ31 Magnesium Alloy Sheet

Numerical simulation and experiments are combined in the research of deep drawing of AZ31 magnesium alloy non-rotary part in this paper. The deformation law during the deep drawing of AZ31 magnesium alloy square part is mainly researched and the difference between deep drawing of square part and that of ladder part is analyzed.It is pointed out that the fluidity changes with the position of AZ31 magnesium alloy sheet lead to a contradiction between the wrinkling of corner and that of sidewall. To solve the problem, the dead zones of deformation need to be cut and then the contradiction can be harmonized, but it also requires segment-hydraulic blank-holder force (BHF) loading condition.The influence of parameters on the deep drawing of AZ31 magnesium alloy sheet is also researched. The optimum temperature for the deep drawing is 200℃, the draw ability improves at the conditions of non-isothermal deep drawing which can lift the height of square part form 65mm to 113mm. The requirements of BHF change in different position of AZ31 magnesium alloy sheet, so the deep drawing of square part will benefit form the segments BHF loading, the experiment proves that the 6-pin loading condition is better than the 4-pin loading condition. The optimum gap of punch and die is 1.0mm when the thickness of sheet is 0.8mm, and the radius of the corner of die should be in the range of 4~6mm when the radius of straight-side is 6mm. Besides, slower deformation velocity is helpful to the deep drawing.Comparing with square part, the deformation at the bottom of ladder part differs with the position during the deep drawing, which leads to a more complicated failure. The bottom of ladder part wrinkles due to the lack of restriction of mould and the wrinkling occurs at the side of ladder part because of strain accumulation which is coursed by the poor fluidity of sheet. The optimum temperature of die and blank holder is 200℃while that of punch is 110℃at the condition of non-isothermal deep drawing. The wrinkling of corner and sidewall is suppressed when the predicted blank shape is used, but wrinkling of the side wall inflection angle aggravates at the same time.