Method and apparatus for electromagnetic forming of thin walled

Details Method and apparatus for electromagnetic forming of thin walled Method and apparatus for electromagnetic forming of thin walled

1996-03-22

1998-03-24

Jones, David

Metal deforming

By application of fluent medium, or energy field

By kinetic energy of fluid or field

72430, B21D 2614

Patent

active

057300160

ABSTRACT:
An apparatus for deforming a sheet metal workpiece comprises an inductor for generating a magnetic field, a die comprised of substantially non-conductive material, and a workpiece comprised of substantially conductive material situated such that a current flowing in the inductor creates a magnetic field forcing the workpiece toward the surface of the die. Preferably, a flux transfer member is provided between the inductor and the workpiece to improve forming efficiency. In one preferred embodiment, the workpiece is an aluminum beverage container having a wall thickness of approximately 0.004 to 0.008 inches. In this embodiment, the waveform of the inductor current preferably comprises damped oscillations, and the frequency of the oscillations is approximately 20 to 60 kilohertz.

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