| 摘要 |
PURPOSE:To cut a pipe simply without damaging the pipe in cutting a pipe using an electromagnetic forming device and dies having sharp shoulder parts by setting the quantity of electric energy within the range in which stress necessary for cutting is generated. CONSTITUTION:A pipe 2 is fitted to a cutting coil 1 on a coil stand 5. At the same time, a pair of dies 6a, 6b are arranged at the outside of the pipe 2 through a spacer 8. These dies 6a, 6b have sharp shoulder parts 7a, 7b along the cutting line of the pipe 2 on inner rims of opposing faces, and the distance between cutting lines can be determined by changing the distance (l) between opposing dies. The pipe is cut by the same principle with electromagnetic forming. When electric energy accumulated in a capacitor C is supplied to the cutting coil 1 which acts as a primary coil, the pipe 2 becomes a secondary coil and induction current is generated. Repulsive force is generated between the coil 1 and pipe 2 corresponding to the change of magnetic field. The cutting part of the pipe 2 is bulged out between the pair of dies 6a, 6b, and the pipe 2 is cut. |
