Metal working – Method of mechanical manufacture – Structural member making
Patent
1998-11-04
2000-07-25
Bryant, David P.
Metal working
Method of mechanical manufacture
Structural member making
294211, 294551, 29523, B21D 4700, B21D 3900
Patent
active
060922877
ABSTRACT:
A rigid connection of structural parts of a motor vehicle and a tool and for establishing the connection are provided. The structural parts are fixed together after a coating during their assembly to one another in a simple, joined and effective manner without plastically deforming the respective exterior structural part and damaging the coating in the process and therefore visually impairing the visible side of the structural parts. The two structural parts to be connected are designed as oblong hollow bodies with one structural part having axially spaced radial cross-sectional reductions along the length of the connection in which the other structural part is held on it while forming a releasable plug-type connection and in that the first structural part--starting from the plug-in position. Because of the expansion between the plug-type connection points, during an internal high-pressure deforming, the parts are locked in a form-fitting manner. The interim structural part, in contrast to the other structural part, being constructed to be more easily plastically deformable under high pressure. A tool used for the deforming is constructed as an oblong, radially expandable, elastic, hollow swelling body which is closed on all sides in a pressure-tight manner, has a pressure connection extending to the outside and connected with a high-pressure fluid line, and is provided with a tension device hindering axial expansions of the swelling body. The tool, in a flexible condition subjected to a fluid pressure, is introduced into the interior structural part in it plug-in position and plastically widens the interior structural part under a higher pressure until a locking form-fitting of the two structural parts occurs.
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Bryant David P.
Daimler-Chrysler AG
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