While pushing through bending mannered null circular tubing material

摘要

PROBLEM TO BE SOLVED: To provide a press-through bending method for performing a continuous bending process of a circular pipe material 1 by feeding the circular pipe material 1 to a bearing section 3a of a die 3 with an offset (Ur) from a central axis 4 of a guide cylinder 2, in order to solve the trouble that the processed circular pipe material 1 directly contacts a movable pedestal 14 to disable the bending process of the circular part at the bending stage when the offset is established on the side of the movable pedestal 14 with the die 3 fixed.;SOLUTION: In the method, feeding of the circular pipe material 1 is once stopped to move and control the movable pedestal 14, the center 5 of the bearing section 3a is allowed to make a half-turn around the central axis 4 of the guide cylinder 2 with the offset Ur as a radius, and then the feeding is restarted. Since the circular pipe material 1 axially makes a half-turn to configure the processed pipe material on the opposite side of the movable pedestal 14 (i.e., upper side of both the die 3 and the guide cylinder 2), direct contact with the movable pedestal 14 can be avoided.;COPYRIGHT: (C)2003,JPO