Parameter Measurement and Conductive Heating During Press Hardening by Hot Metal Gas Forming

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 clos...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 651; no. 1; pp. 12083 - 12090
Main Authors Bach, M, Degenkolb, L, Reuther, F, Psyk, V, Mauermann, R, Werner, M
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.11.2019
Subjects
Automotive bodies
Coordination compounds
Displacement measurement
Functional integration
Heat distribution
Heating
Hydroforming
Internal pressure
Temperature
Temperature profiles
Thermocouples
Wall thickness
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Summary: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.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/651/1/012083