Effect of Field Intensity on Electromagnetic Flat Sheet Forming

Electromagnetic forming (EMF) is a dynamic, high strain-rate forming method. In this paper modeling and calculation procedure are presented for the electromagnetic forming of thin aluminum sheets. Flat spiral coil was used as actuator in this scheme. The prime focuses of the study are: calculation of the electromagnetic field generated by coil using the software FEMM 3.4 and shape analysis of the formed workpiece. Electromagnetic field intensity has a principal role in forming of sheets. Concentric circles winding flat coil constructed and the pulsed current taken by discharge from the capacitor bank is the source of high intensity magnetic field. Two different energy levels of Capacitor bank were used (4 kJ and8 kJ) to get the field intensity 1.4 and 2.5 Tesla. The method is based on the Biot-Savart law, and solution of magnetic induction integral equations is performed by numerical methods specifically with the use of commercial software. Optimum results are presented at the end. Approach of this work was initially analysis of method and then development of durable actuator (coil).