발간논문

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Vol.39, No.9, 1076 ~ 1084, 2001
Title
Research Papers / Materials Processing : Finite Element Analysis and Experimental Investigation on the Thermal Deformation Behaviour of Steel Sheets during Press Hardening
김형섭Hyoung Seop Kim,서민홍Min Hong Seo,김성주Sung Joo Kim,백승철Seung Chul Baik,방원준Won Joon Bang,이홍노Hong Rho Lee
Abstract
The press hardening process, which is the hot pressing of steel parts using cold dies, can utilize both ease of shaping and high strength due to the hardening effect of rapid quenching during the pressing. In this study, a thermo-elastoplastic analysis of the press hardening process using the finite element method was performed in order to investigate the deformation behaviour and temperature history during the process and the mechanical properties of the pressed parts. The effects of friction on the thermal-deformation behaviour of steel sheets are investigated. We also carried out experiments of temperature measurements during pressing and quenching of a car bumper part to obtain the experimental heat transfer coefficients for comparison with the predictions. It was found that the strength of the press hardened boron steel sheet can increase up to about Hv 430 due to the rapidly quenched microstructure consisting of martensite. The finite element analysis can produce useful information for the process optimisation.
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