| abstract |
Hollow bodies, such as construction elements for vehicle construction, can be deformed by anPreform from a longitudinal hollow body or from sheets of aluminum or itsnAlloys by a high pressure process or by superplastic forming, inna tool. In this process, the preform is local, beforenthe forming process, at the points of high elongation during the forming process, onenExposed to soft annealing and / or that the tool for the forming process is localnSurface properties of different friction, such as roughness patterns or smoothednSurfaces, equipped. |