Design, Implementation, and Testing of a Pulsed Electromagnetic Blank Holder System

In this paper, pulsed attractive electromagnetic force between two coils has been introduced for supplying blank holding force in sheet metal forming process. First, the requirements on the pulsed blank holding force and constraint conditions on the system were specified. Then, a design flow of the coil system fulfilling the requirements was presented. Based on the design, a prototype of a pulsed electromagnetic blank holder was fabricated. Numerical and experimental investigations were carried out to validate the feasibility of the designed system. Results show good agreement between the measured and simulated results of discharge currents and magnetic fields. The system generates a pulsed blank holding force with a magnitude of 930 kN and a rise time of 4.56 ms, which fulfills the specified requirements.