| 摘要 |
PCT No. PCT/SE94/00945 Sec. 371 Date Mar. 27, 1996 Sec. 102(e) Date Mar. 27, 1996 PCT Filed Oct. 7, 1994 PCT Pub. No. WO95/10000 PCT Pub. Date Apr. 13, 1995A tool is used for expanding a pipe-end which includes a plurality of jaws that can be moved radially in relation to a centre axis, between a retracted position and an outer expanding position. The jaws are inserted to a given distance in the pipe-end with the jaws in their retracted position. The jaws have outer surfaces which lie adjacent one another in the retracted positions of the jaws and have a circular-arcuate shape in cross section for engagement with the inner surface of the pipe-end. The radial distance of the outer jaw surfaces from the centre axis increases from the insertion end of the jaws to their opposite end. The pipe-end is expanded successively in several stages with relative small jaw movements, wherein the jaws are retracted and inserted further into the pipe-end between each expansion stage. The jaws of the tool can be moved radially through a distance which is smaller than the ultimate radial expansion of the pipe-end. |
