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Hydroforming and press hardening - determination of the shape accuracy at complex bended tubes

Innenhochdruck-Umformung und Presshärten - Untersuchung der Formgenauigkeit eines mehrfach gebogenen Bauteiles
: Paul, Alexander; Pierschel, Norbert; Fäth, Christian; Schieck, Frank

Kolleck, Ralf (Hrsg.) ; TU Graz, Institute Tools and Forming:
Tools and Technologies for Processing Ultra High Strength Materials : TTP 2013 Science Meets Industry, September 19-20, 2013, Graz; Conference Proceedings
Graz: Verlag der TU Graz, 2013
ISBN: 978-3-85125-294-1
ISBN: 3-85125-294-2
Conference "Tools and Technologies for Processing Ultra High Strength Materials" <2013, Graz>
Conference Paper
Fraunhofer IWU ()
media based press hardening; hydroforming; tube; 26MnB5; press hardening; form hardening

In an EFB / AiF supported project at Fraunhofer IWU Chemnitz the process combination of hydroforming and press hardening was successfully applied to a series production part with multiple bends. The focus of the investigations was on the determination of the repeatability of the forming process as a function of two process parameters part temperature and forming pressure. The wall thickness, hardness, forming accuracy and mechanical properties of formed components were measured and analysed. The manganese boron steel tubes (26MnB5) had a diameter of 55 mm, a wall thickness of 2 mm and a x-tec® coating. During forming, a high large circumferential elongation of up to 60 % combined with a very good dimensional accuracy was achieved.