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논문 기본 정보

자료유형
학술저널
저자정보
전용준 (한국생산기술연구원) 최현석 (한국생산기술연구원) 강정진 (한국생산기술연구원) 채보혜 (한국생산기술연구원) 김동언 (한국생산기술연구원)
저널정보
한국자동차공학회 한국자동차공학회논문집 한국자동차공학회논문집 제28권 제12호
발행연도
2020.12
수록면
903 - 908 (6page)
DOI
10.7467/KSAE.2020.28.12.903

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초록· 키워드

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Although post-processing by using trimming dies has been continuously conducted to shorten the processing time of press-hardened steel, it is quite difficult to secure the life expectancy of the dies due to its high strength at 1.5 GPa. Therefore, in this study, hot piercing was performed at 550 °C during the quenching process of press-hardened steels. The characteristics of the pierced holes were analyzed after changing the shearing angle of the piercing punch. The specimen on which a flat punch with a shear angle of 0° was applied showed a 17 % rollover, 65 % burnish, and 18% fracture, all relative to depth. However, when a piercing punch with a shear angle of 2° was applied, the surface quality deteriorated considerably, with a 14 % rollover, 12 % burnish, and 74 % fracture. These results indicated that when a piercing punch with a shearing angle was applied, the diameter of the piercing hole increased above the target dimension. This can be attributed to the unbalanced load occurring in the radial direction of the piercing punch when the active surface of the punch failed to make contact with the material in the circumferential direction. Moreover, the application of the piercing punch also reduced the effect of the shear load. This can be explained by the temperature at which the piercing process was performed (i.e., 550 °C), which was higher than the martensitic transformation temperature of press-hardened steel. Therefore, the application of a piercing punch with a shearing angle is deemed unsuitable for the piercing process, which would be conducted during the quenching of press-hardened steel, for the following reasons: decreased quality of the processed surface, increased diameter of the processed hole, and reduced impact load.

목차

Abstract
1. 서론
2. 핫스탬핑 고온 피어싱 실험
3. 피어싱 펀치 형상에 따른 전단품 특성 평가
4. 전단각에 따른 금형 수명 영향성 평가
5. 결론
References

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