Electromagnetic Bulging of Stainless Steel Sheet by Using Flat One-Turn Coil
In this paper, we describe an electromagnetic bulging for a SUS304-O stainless steel sheet (0.15 mm thick) and its experimental results. In the die forming, the flat one-turn coil is adopted for the bulging of the SUS304-O sheet, when an aluminum sheet (0.3 mm thick) as a driving plate (driver) is used together. When an impulse current from an energy-storing capacitor bank passes through the flat one-turn coil, a high-density magnetic flux is suddenly generated around the coil. Eddy currents are induced in the driver placed on the coil. The SUS304-O sheet is pressed by an electromagnetic force generated in the driver, leading to bulge into a meandering groove with small concave shape. The bank energy required for the bulging of 12mm wide, 60mm long and 0.43mm high is about 4.5 kJ, and the obtained workpiece does not almost have wrinkles and curves.
S. Itoh, J.J. Yoh and K. Hokamoto
M. Ishibashi et al., "Electromagnetic Bulging of Stainless Steel Sheet by Using Flat One-Turn Coil", Materials Science Forum, Vol. 673, pp. 101-106, 2011