Method and device using high interior pressure to reshape structural section |
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申请号 | US10705488 | 申请日 | 2003-11-10 | 公开(公告)号 | US07028520B2 | 公开(公告)日 | 2006-04-18 |
申请人 | Arndt Birkert; Sven Schneider; | 发明人 | Arndt Birkert; Sven Schneider; | ||||
摘要 | A method using high interior pressure to reshape structural section of continuously bounded overall cross-section, whereby the overall cross-section can be provided with extra walls or chambers and a stopper is forced radially against each end of the piece. The object is to reduce wear on the stopper while ensuring that any walls or chambers in addition to its overall crosssection will buckle or bulge only at their ends. | ||||||
权利要求 | The invention claimed is: |
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说明书全文 | The present invention relates to a method using high interior pressure to reshape structural section. The structural section being reshaped using high internal pressure may be tubing as disclosed in German 3 923 358 A1 and in U.S. Pat. No. 4,414,834 A. Pieces with a non-circular cross-section, however, can also be reshaped. Such material is usually extruded. To ensure unobjectionable fluid tightness, a stopper is forced radially against each end of the structural section. The end of the piece rests against an edge of the stopper, creating a seal. To reduce wear on the stoppers as much as possible, the seal-creating edge is made of a wear resistant material and is forced against the interior surface of the section subject to relatively high pressure. It would also be desirable to similarly use high interior pressure to reshape pieces with extra walls or chambers projecting into or out of their overall cross-section. There is, however, a drawback to such a procedure in that the walls or chambers tend to deform axially along the piece, allowing the edges to buckle or bulge out axially undefined. It is of course possible to counteract this tendency by making the edges of a softer material. This approach, however, increases wear on the edges. The object of the present invention is accordingly a method of and a device for using high interior pressure to reshape structural section with walls or chambers that project into or out of its overall cross-section, whereby the stoppers are subjected to low wear and whereby the extra walls or chambers will buckle or bulge out only at their ends. The major advantage of the present invention is that complex structural section with extra walls or chambers can be reshaped using high interior pressure, decreasing the cost of manufacture. Since the section is reshaped only slightly at the ends, they will need to be trimmed only slightly if at all as the material is further processed. One embodiment of the present invention will now be specified with reference to the accompanying drawing, wherein While it is being reshaped and still inside the reshaping tool, the ends of the piece are sealed by stoppers 8 forced radially against them. Each stopper 8 is provided with a seal-creating edge 9 established on the surface of a gasket 10 that rests against the stopper. Each edge 9 accordingly fits tight into the structural section. Each stopper 8 is provided with aligners 11, 12, and 13 that more or less fit into chambers 4, 5, and 6, which they enter into as stopper 8 is advanced toward the piece. Partitioning walls 2 and 3 and overall cross-section 1 are accordingly secured radially, the overall piece being introduced against and correctly positioned in relation to each stopper 8. Gasket 10 and aligners 11, 12, and 13 can now attach the schematically illustrated connectors 14, 15, and 16 to stopper 8. Connectors 14, 15, and 16 can also convey the fluid that provides the reshaping pressure. To ensure a well controlled buckling or bulging out by walls 2, 3, and 7, they are provided with slots 17 more or less paralleling the inner surface 18 or outer surface of cross-section 1. The slot 17 in the illustrated example is very near inner surface 18. These slots are preferably produced by an appropriately shaped bit on stopper 8 as the stoppers are brought together.
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