Manufacturing Process of Curved Extrusions for Aluminum
Alf Birkenstock, Karl-Heinz Lindner and Norbert-William Sucke, Erbslöh AG
Track: VALUE-ADDED PROCESSES - Extrusion
ABSTRACT --- A need to reduce fuel consumption and a growing variety of vehicle
designs are leading to the use of lightweight automotive bodywork. For bodywork with
a space-frame construction, conventionally curved profiles (manufactured using the
process chain comprising extrusion, stretching and bending) are used. Where
necessary, to comply with tolerances, the profiles are then hydro-formed (IHU). A new
and innovative forming process, known as rounding during extrusion" allows profiles
with no spring-back to be manufactured. Such profiles have highly accurate contours.
The European Patent EP 0706 843 B1 Method and device for the production of curved
work pieces (Patent holder: Erbslöh AG) forms the basis of the BMBF-joint research
project rounding during extrusion (Duration: 01/03/2001 31/12/2004). The aim of the
project is to transform the concept behind the patent into a manufacturing process that
is ready for use by the end of 2004.
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