Experimental Study on Electromagnetic Forming of High Strength Steel Sheets with Different Dimensions of Aluminum Driver Plate
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Date
2014
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Abstract
Recently, the potential of the electromagnetic forming process has been introduced to
form 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 seems
that the application may not be easy for high strength steel sheet because of its high
tensile strength and low electric conductivity. In order to overcome this difficulty, aluminum
driver plate could be considered to enhance the formability of high strength steel sheets in
the electromagnetic forming process. In this paper, in order to investigate the effect of
aluminum driver plate on forming height of high strength steel sheet in electromagnetic
forming process, DP780 workpiece sheets were formed into a hemi elliptical protrusion
shape with Al1050 driver plate of various thicknesses and sizes. Experiments were
performed 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 high
strength steel sheets. In addition, the forming height of high strength steel sheet increases
as the thickness and size of a driver plate increases.
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Keywords
reinforcement rib, aluminum driver plate, electromagnetic forming, flat spiral coil, high strength steel sheet