| 摘要 |
The invention relates to a device for expanding hollow bodies, in particular pipe ends, comprising several radially movable, sector-shaped expandable jaws (1), which are arranged in a retainer so as to be distributed about an axis "A-A" and have cut-outs from cylindrical surfaces (6), the radii of which correspond to the radii of the expanded hollow body (10), wherein projections (8) and recesses (7) are arranged in alternation in the joints between the expandable jaws (1), and wherein the outer surfaces of the projections (8) extend radially inward relative to the cylindrical surfaces (6) at least at the ends thereof. In order to achieve the aim of producing sufficient expansions for the connection of plastic pipes by means of a single-stage radial stroke and nevertheless suppressing sharp-edged impressions in the expanded pipe end, a) the cylindrical surfaces (6) have a rounded transition into the outer surfaces of the projections (8), b) the expandable jaws (1) are tapered radially inward in the area of the free ends thereof, and c) the recesses (7) and the projections (8) are continued in the area (11) tapered radially inward. The invention further relates to a use of the device to expand hollow bodies (10) made of plastic pipes having shape memory. |
