| 摘要 |
PURPOSE:To reduce remarkably the cost of a driver by piling up metallic foils excellent in flexibility and electric conductivity on the surface of a material to be worked to form a driver to be used as a secondary coil. CONSTITUTION:Metallic foils excellent in flexibility and electric conductivity such as Al or Cu are piled up on the surface of a material 1 to be worked, to form a laminated driver 2 functioning as a secondary coil. A primary coil 3 opposing to the driver 2 is inserted into the driver 2 and connected to an electric circuit. The electric circuit consists of a charging circuit, a capacitor C, a resistance R, a control circuit, and a switch S controlled by the control circuit in closing and opening the circuit. After completing the charging of the capacitor C, when the switch S is closed by a signal outputted from the control circuit, an electric current flows from the capacitor C in the arrow direction to produce a repulsive force between the driver 2 and the coil 3, then the material 1 is radially expanded and formed. |
