Experimental Study on Electromagnetic Forming of High Strength Steel Sheets with Different Dimensions of Aluminum Driver Plate

摘要

Recently, the potential of the electromagnetic forming process has been introduced toform the shallow longitudinal reinforcement ribs in the lateral walls of roll formed parts,made of high strength steel sheets of 340MPa tensile stress grade [1]. However, it seemsthat the application may not be easy for high strength steel sheet because of its hightensile strength and low electric conductivity. In order to overcome this difficulty, aluminumdriver plate could be considered to enhance the formability of high strength steel sheets inthe electromagnetic forming process. In this paper, in order to investigate the effect ofaluminum driver plate on forming height of high strength steel sheet in electromagneticforming process, DP780 workpiece sheets were formed into a hemi elliptical protrusionshape with Al1050 driver plate of various thicknesses and sizes. Experiments wereperformed with a flat spiral coil actuator connected to an electromagnetic forming system.The results, the aluminum driver plate helps to increase the forming height of highstrength steel sheets. In addition, the forming height of high strength steel sheet increasesas the thickness and size of a driver plate increases.