| 摘要 |
PURPOSE:To quickly execute working, and to improve the working accuracy by providing a pair of flat cutters which have formed a finishing edge on a triangular edge base, and subsequently, pressing, and inserting and holding a pipe material, and moving relatively both the cutters from the top part side to the bottom part side. CONSTITUTION:A pair of flat cutters 12 which have formed a finishing edge 12C of a triangular shape on a plane are provided so as to be movable relatively in the orthogonal direction against the axis center of a pipe material 10. Subsequently, each flat cutter 12 is set to the right by a dimension L2 portion from the left end of the pipe material 10 and moved relatively from a finishing edge top part 12C-1 to a bottom part 12C-2 by pressing, and inserting and holding the pipe material 10. Also, by eliminating the end part of the length L2, a product is obtained. In this case, a pressure force of the finishing edge 12C against the pipe material 10 is reduced, and a deformation of the pipe material 10 in the axis center direction can be prevented. Accordingly, form rolling is executed easily, and the working can be executed quickly. |
