| 摘要 |
<p>PURPOSE:To facilitate manufacturing an I-shaped joint, having a head part use part provided with a curved peripheral surface and a pipe part use part protruded to the sideward, by placing an element pipe, cut into a short cylinder shape, in a bulge use metal mold, and performing bulge working by charging the inside of the element pipe with elastic unit or liquid. CONSTITUTION:In the case of manufacturing an I-shaped joint, an element pipe (a) cut into a short cylinder shape, in a curved internal peripheral surface 5 of internal diameter almost equal to an external diameter of a head part of the I-shaped joint, is engaged in bulge use metal molds 2, 3 having a head part use hole part 4 provided with each opening part 6, 7 in the center line axial direction and having a pipe part use hole part 8 to the sideward from the hole part 14. In a condition of charging the inside of the element pipe (a) with a pressurizing material 9 of elastic unit or liquid, both side end faces 12 of the element pipe (a) are pressurized by punches 10, 11 from each opening part 6, 7 of the metal mold 2, 3, to form a bulge molded product 14 of molding a head part use part 15 and a pipe part use part 16. Thereafter, the pipe part use part 16 is drilled and also further drawn out by burring work, to obtain a product by performing required finish cutting.</p> |
