| 摘要 |
PURPOSE:To set easily the out of roundness at the end of pipes having different diameters by making the mounting position of pipe expanding rollers adjustable and rotating the rollers along the inside circumference of the pipe. CONSTITUTION:When a rod 7 is pulled toward the outside of a pipe 4 by means of a hydraulic cylinder 6, a rod 8 is extended in the radial direction of the pipe and pipe expanding rollers 1 supported by holding means 5 flares forcibly the end part of the pipe. Such operation is performed while the pipe 4 or a stationary platen 9 is rotated and if the platen 9 or the pipe 4 is moved within the range where the out of roundness is required, the end part of the pipe 4 receives the plastic deformation with pipe expanding rotation and the stress distribution in the end part of the pipe is made roughly uniform, whereby the pipe is set to the out of roundness. The expansion and setting of the pipes having different diameters are thus made possible by changing the length of the rod 8 and the mounting position of a mounting seat 10. |
