| 摘要 |
Pipe-bending rig 10 anchors an end of pipe 16 and comprises former 18, presenting a convex forming surface. Bending drive 32 exerts, possibly via wire 38, a lateral force on the unfixed end to effect plastic deformation of the pipe against the former. A carriage 28 is movable along a path, preferably parabolic and defined by parallel rails 22. A link 26 carried by the trolley 28 imparts longitudinal tension to the pipe during lateral deflection. The carriage may be moved passively by the pipe, or may have separate means (not shown) to maintain angular alignment with the pipe end. A straightening former 20 and corresponding drive 34 may also be present, opposed to and having a greater radius of curvature than the convex former. The rig may be used for pipes with composite structure, the rig simultaneously bending and tensioning a pipe for testing purposes, as occurs during spooling. |
