| 摘要 |
<p>PURPOSE: To reduce the number of pressings needed for forming of a flange joint compared with the conventional, and thereby reduce the man-hours needed for forming the flange joint. CONSTITUTION: In the first process, a pipe 1 is inserted into a mounting hole 25, the inner peripheral surface of which is gradually throttled from the anti- abutting face 21 side of a member 30 to be connected toward the abutting face 22 side. In the second process, the part of the pipe 1 which is inserted into the mounting hole 25 from the axial direction of the pipe 1 by a first pressing, is swelled to be brought into close contact with the inner peripheral surface of the mounting hole 25, and the part of the pipe projected from the abutting face 22 side of the mounting hole 25 is swelled to preliminarily form an expansion part 3. In the third process, the expansion part 3 is finally formed by second pressing from the axial direction of the pipe 1. In the fourth process, an opening part 5 is formed at the tip part of the pipe 1 on the side of the expansion part 3 by third pressing, and an O-ring mounting part 4 is provided between the ring-like expansion part 3 and the opening part 5.</p> |
