To provide a method for electromagnetic forming, capable of preventing breakage of a coil by reducing the electromagnetic force that is generated in the annular coil when electromagnetic forming.
A forming tube 2 to be formed is arranged so that the annular coil 1 is fittedly inserted into the forming tube 2. The forming tube 2 and a dummy tube 5 that has at least the same inside diameter as that of the forming tube 2 are arranged so that the center axes of the forming tube 2 and the dummy tube 5 are aligned and the tubes 2, 5 are adjacent in the center axis direction. Then, the electromagnetic force from the annular coil 1 is applied to the forming tube 2 and to the dummy tube 5 by passing an electric current through the annular coil 1. In this case, the shape and material quality of the dummy tube 5 are preferably the same as those of the forming tube 2 in order to make equal the electromagnetic force acting on the forming tube 2 to the one acting on the dummy tube 5.
HOSOI HIROAKI
KANEHASHI HIDEKATSU
| JP2007275909A | 2007-10-25 | |||
| JPS5542140A | 1980-03-25 | |||
| JP2004351455A | 2004-12-16 |