Response of Thin Sheet Metal on the Excitation in Electromagnetic Forming

Abstract

Due to their low inertia, vibrations are stimulated during electromagnetic forming of thin sheets, whereby the excitation might involve the impact on the die and the oscillation of the electromagnetic forces. Depending on the configuration of the pulsed power generator and the resulting tool coil current, forced and free workpiece vibrations could be observed in experiments. The results indicate an influence of the vibrations on the springback behavior after thin sheet metal forming. Due to the workpiece vibration, the forming behavior changed. The results emphasize the need of designing pulsed power generators that adapt to the desired process.

Keywords

• vibration
• in-process measurement
• free forming
• deformation
• aluminum