Temperature effect on electromagnetic forming process by finite element analysis

Article type: Research Article

Authors: Kuo, Chia-Lung^a | You, Jr-Shiang^a | Hwang, Shun-Fa^{a; *}

Affiliations: [a] Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, 123 University Road, Section 3, Douliou, Yunlin, Taiwan

Correspondence: [*] Corresponding author: Shun-Fa Hwang, Tel.: +886 5 5342601 Ext. 4143; Fax: +886 5 5312062; E-mail: [email protected]

Abstract: In the electromagnetic forming (EMF) process, the Lorentz force is generated by the repulsive interaction of magnetic field between a pulse transient current in a coil and an eddy current in a workpiece. During the process, the current will generate Joule heat in both the coil and workpiece raising their temperatures. The objective of this work is to build a coupled analysis to consider the temperature effect during the electromagnetic sheet metal forming process by using a finite element analysis. During the analysis, the electromagnetic, mechanical and temperature problems are considered simultaneously. Then, the coupling effects of the temperature with eddy currents, magnetic fields, magnetic force density, and deflection of the sheet metal are discussed. The results indicate that the temperature increasing is significant especially during repeated working cycles, and the deflection of a sheet metal is reduced as the increasing of the coil temperature. Hence, this temperature effect should be considered to avoid the failing of products and to improve the life of the forming coil, especially in a mass production process.

Keywords: Electromagnetic forming, sheet metal forming, high forming rate, finite element analysis, temperature effect

DOI: 10.3233/JAE-2011-1319

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 35, no. 1, pp. 25-37, 2011