| THERMO-MECHANICAL COUPLED ANALYSIS OF HOT PRESS
FORMING WITH 22MnB5 STEEL |
| Hyung-gyu Kim1, Chanhee Won1, Seungho Choi1, Moon-gyu Gong2, Joon-gyu Park2, Heejong Lee3, Jonghun Yoon1 |
1Hanyang University
2GNS Ltd.
3LG Electronics |
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| ABSTRACT |
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This paper mainly concerns the thermo-mechanical analysis to evaluate the process parameters in the hot press
forming with the 22MnB5 sheet such as the austenitization temperature, transport and quenching time for enhancing the
efficiency in the production cycle. It is noted that the transport time is most influencing process parameter in the hot press
forming to increase production efficiency without sacrificing the strength of the final product. In addition, we newly proposed
a scheme to reproduce the flow curves of the hot stamped 22MnB5 sheet with respect to the martensite fraction by correlating
the numerical analyses and tensile test results. To take into consideration of the strength variation in the hot stamped door
impact beam, entire part is partitioned into several domains on which adaptive flow curves are assigned with respect to the
martensite fraction. It demonstrates a good agreement with experimental 3-point bending test with the hot stamped door
impact beam when applying the proposed method adopting adaptive flow curves with respect to the martensite fraction. |
| Key Words:
Hot press forming, Coupled analysis, Martensite, 22MnB5, 3-point bending |
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Corresponding Author.
Jonghun Yoon , Email. 
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