Superplastic Differential Temperature Deep Drawing based on Thermal-Mechanical Coupled Numerical Simulation

Superplastic differential temperature deep drawing (SDTDD) of AA5083 bracket with big drawing ratio was investigated with thermal-mechanical coupled numerical simulation and experiment. The power-law constitutive model of AA5083 was established as function of temperature into simulation. And it was analyzed that the effect of blank holder gap, differential temperature between punch and die, and friction on the flowing ability and thickness distribution of material. The results show that SDTDD is able to form the bigger drawing ratio and obtain more uniform thickness distribution than the conventional drawing. The localized thinning takes place near the entry radius of die and blank holder gap is controlled between 1.05 and 1.1times sheet in SDTDD. Additionally, the greater differential temperature value between punch and die is, the better the material formability is. Friction has double effects on the drawing. And good agreement was obtained between the experimental thickness profiles and the simulated ones.