Electromagnetic forming (EMF) technology uses pulsed current to generate a pulsed electromagnetic force on metal workpiece to accomplish plastic deformation. It is a promising solution for the room temperature processing of lightweight alloy. Coil design is important to energy efficiency and forming performance of EMF. In order to clarify the effect of the equivalent radius of the drive coil on the forming performance, a simulation study is conducted. The preliminary experiment results show good agreement with results of the simulation, and prove the reliability of the simulation model. Then the process of the electromagnetic sheet free bulging is simulated and analyzed. It is found that the combined action of the boundary constraint and the inertia effect will influence the maximum forming depth. And the maximum values can be obtained at different systems when the ratio of the equivalent coil radius to the active workpiece radius is about 0.68.
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