| 摘要 |
Provided is a method for manufacturing a three-dimensionally curved pipe that has no gaps, uneven thickness, or the like at the contact sites of the distal ends of two flange portions when press working is completed, said method comprising: a step for forming an extruded portion, in a member to be processed, which extends in a curved manner while being pushed out in a third direction by means of press working in a third plane formed by a first direction and the third direction, forming extended portions that extend away from each other on two sides sandwiching the extruded portion of the member to be processed, and forming flange portions that are curved in the reverse direction to the extrusion direction of the extruded portion at the distal ends of the extended portions; a step for molding the two flange portions so as to head toward each other by curving a curved portion between the extruded portion and the extended portions in the reverse direction while maintaining a curve between the extended portions and the flange portions; a step for making both flange portions of a three-dimensionally curved portion, which are curved in the first plane and a second plane, approach each other using the two flange portions at other than the three-dimensionally curved portion; and a step for bringing the distal ends of the flange portions face to face. |
