| 摘要 |
When expanding a pipe-end (1), there is used a tool which includes a plurality of jaws (8) that can be moved radially in relation to a centre axis (11), between a retracted position and an outer expanding position. The jaws are inserted to a given distance in the pipe-end (1) with the jaws in their retracted position. The jaws have outer surfaces (12) 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 (22, 23) of the outer jaw surfaces (12) from the centre axis (11) increases from the insertion end (20) of the jaws to their opposite end (21). The pipe-end is expanded successively in several stages with relatively small jaw movements, wherein the jaws (8) are retracted and inserted further into the pipe-end between each expansion stage. The jaws (8) of the tool can be moved radially through a distance which is smaller than the ultimate radial expansion of the pipe-end (1).
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