발간논문

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Vol.32, No.5, 531 ~ 538, 1994
Title
Experimental Study on Formability of Automotive Steel Sheet
김기수Ki Soo Kim, 남재복Jae Bok Nam, 최원집Won Jib Choi, 장래웅Rae Woong Chang
Abstract
No single test can accurately predict the press shop formability of sheet metal and provide reproducibility of measured data. However a Limiting Dome Height(LDH) test was developed to specifically rank sheet metals for forming operations. The dome height at plane-strain state, which is the typical failure condition in many automotive stamping process is used as the criterion for sheet metal formability. Moreover, the strain state at failure in the test can duplicate the various strain state at failure in actual stamping operations by oaring the sample width and lubrication condition. In this study the difference between the FLD and the LDH tests was investigated and the LDH curves of various low carbon steel sheets were compared to yield a ranking of materials used in press shop. It was found that lubrication(or friction) was no less important than material itself in LDH values and no significant differences in punch speed and blank holder force(BHF) during the test were observed. A high LDH value is therefore, resulted at low interface friction allowing uniform distribution of strains. The relevance of the plane-strain LDH values with real stamping was checked by material control limit obtained from statistical deformation control chart for wheel house inner blanks.
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