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논문 기본 정보

자료유형
학술대회자료
저자정보
Takaaki IGUCHI (JFE Steel Corporation) Takumi UJIRO (JFE Steel Corporation)
저널정보
한국소성·가공학회 기타자료 NUMIFORM 2010
발행연도
2010.6
수록면
1,193 - 1,200 (8page)

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초록· 키워드

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A new stamping method developed by the authors, in which a temperature gradient is imposed on the workpiece during stamping, is capable of improving stretch formability in stamping of ferritic stainless steel sheets. Unlike the conventional warm stamping method, the temperature gradient is utilized in order to diffuse the strain distribution induced in the material. Basically, the portions of the sheets which are in contact with the top of the punch and die face are heated, while simultaneously, the portions in contact with the punch corners and die corners are intensively cooled The authors developed a finite element simulation model of stamping which analyzes mechanical and thermal behaviors simultaneously utilizing LS-DYNA3D. The numerical analysis, combined with a numerical model which evaluates the ductile fracture limit of the material in the high temperature region, confirmed that the new stamping method improves stretch formability and the optimal temperature gradient is given. In order to verify the numerical analysis, an experimental apparatus was constructed, comprising a set of stamping tools containing heaters and cooling circuits. The experiments demonstrated the correctness of the numerical analysis and the effectiveness of the new stamping method.

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Abstract
INTRODUCTION
FUNDAMENTAL CONCEPT AND TOOL DESIGN
NUMERICAL ANALYSIS
EXPERIMENTS
CONCLUSIONS
REFERENCES

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UCI(KEPA) : I410-ECN-0101-2014-550-003326978