| 摘要 |
PROBLEM TO BE SOLVED: To improve work efficiency by maintaining eccentric amount of a metal bar material in constant during bending and simplifying a structure of a device. SOLUTION: The bending device 10 for steel pipe 1 includes a heating section 11 to heat the steel pipe 1, a cooling section 20 to cool the heated portion, a moving means to move the heating section 11 and a cooling section 20 relatively to the steel pipe 1, a steel pipe carrying section 6 which draws a front end pinching part 2 attached to an end of the steel pipe 1 and a wire 4b locked to the front end pinching part and applies compression force on the eccentric axis line eccentrically shifted by a designated distance from the central axis of the steel pipe 1, an end part rotating arm to rotate the front end pinching part 2 with the rotation axis conforming to the bending curvature or the bending profile as the center, an eccentric distance maintaining member 8 with the shape conforming to the bending curvature or the bending profile, around which the wire 4b is wound, and a pressure roller 34 supported by a rotation shaft 31 of the end part rotating arm 33 and rotatably pressed on the steel pipe 1. COPYRIGHT: (C)2011,JPO&INPIT |
