Research on Electric Current-Assisted Draw Bending of AA7075-T6 Sheet

Electrically-assisted forming is a promising technology to realize the precise forming of materials with poor formability. For stamping process, the typical deformation process of sheet metal is that the sheet metal experiences bending and reverse bending when it passes through the corner of die, and the draw-bending test can well characterize this typical deformation process. Therefore, this paper studies the influence of normalized back force (0.1, 0.25), temperature (25 ℃, 65 ℃, and 150 ℃), current (0A, 830A, 1300A, and 1700A) on the springback of AA7075-T6. The results show that the springbackSpringback can be reduced by loading current during draw-bending test. Moreover, the larger the normalized back force is, the larger the reduction of springback angle is, which shows that the electroplasticityElectroplasticity becomes more obvious with the increase of normalized back force. At the same temperature, with the increase of current, the springback angle decreases. Moreover, the higher the temperature is, the larger the reduction of springback angle is, which shows that pure electroplasticityPure electroplasticity becomes more obvious with the increase of temperature.