The research of electromagnetic incremental forming process of Aluminum alloy sheet and the interaction between the die and the sheet

Electromagnetic forming is a high-speed forming technology using pulsed Lorentz force to drive the deformation of metal sheet, it can improve poor formability of metal sheet at room temperature, such as aluminum alloy. But the traditional electromagnetic free bulging technology can only form conical parts, it is difficult to form bottom region flat parts even using flat bottom mold. Electromagnetic incremental forming technology not only can manufacture the large-size sheet part, but also form bottom region flat part. So basing on the concave die electromagnetic incremental forming technology is proposed. The process of forming bottom region flat part by the electromagnetic incremental forming technology is analyzed with experiment and numerical simulation methods. The effects of the discharge voltage, coils moving trajectory and high-speed impaction interaction between concave die and sheet on sheet formability are also discussed. (C) 2017 The Authors. Published by Elsevier Ltd.