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Parameter measurement and conductive heating during press hardening by hot metal gas forming

: Bach, Mirko; Degenkolb, Lars; Reuther, Franz; Psyk, Verena; Mauermann, Reinhard; Werner, Markus

Fulltext ()

International Deep Drawing Research Group -IDDRG-:
38th International Deep Drawing Research Group Annual Conference, IDDRG 2019 : Forming 4.0: Big Data - Smart Solutions, 3-7 June 2019, Enschede, Netherlands
Bristol: IOP Publishing, 2019 (IOP conference series. Materials science and engineering 651)
Art. 012083, 9 pp.
International Deep Drawing Research Group (IDDRG Conference) <38, 2019, Enschede>
Conference Paper, Electronic Publication
Fraunhofer IWU ()
HMGF; press hardening; temperature; forming path measurement; endurance tests; conductive heating

Press hardening of steels for the production of car body components is very common. The reason for this is that the process allows the use of blanks with low wall thickness and the production of ultra-high strength components with complex geometries. The Hot Metal Gas Forming (HMGF) process for closed profiles combines the advantages of hydroforming, such as increased rigidity, functional integration or elimination of joining operations, with those of press hardening. In this paper results of continuous tests with actively cooled tools are presented in combination with temperature and displacement measurement. Furthermore, test results for HMGF with tool integrated conductive heating are demonstrated. Tests were done with tube material PHS1800 by SSAB, part temperatures over the Point of austenitisation and maximum internal pressure of 70 MPa. Thermocouples recorded the heat distribution in the tools. Other measured and recorded variables were the displacement of the component wall while forming under increasing internal pressure by a tactile displacement sensor and simultaneous temperature of its surface with a thermal sensor head. For the first time, information on pressure, the corresponding deformation stage and temperature profile could be documented during an entire forming step. A close to series production geometry DP4 was used to investigate the tool-integrated conductive heating of components.