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NTIS 바로가기소성가공 = Transactions of materials processing : Journal of the Korean society for technology of plastics, v.29 no.5, 2020년, pp.241 - 250
윤재익 (현대자동차 강판재료개발팀) , 오규환 (현대자동차 강판재료개발팀) , 이석렬 (POSCO 성형연구그룹) , 유지홍 (현대자동차 강판재료개발팀) , 김태정 (현대자동차 강판재료개발팀)
In this study, the methodology of the springback prediction of automotive parts applied 3rd generation AHSS was investigated using the response surface model analysis based on a regression model, and the meta model analysis based on a Kriging model. To design the learning data set for constructing t...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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부품 성형시 어떤 성형 공법을 적용할 수 있는가? | 또한, 부품 성형 시 드로우 성형, Stake bead 성형, 폼 성형 등의 여러 공법이 적용될 수 있고[27,28], 성형압(blank holder force, BHF), 성형 깊이(draw height, DH), 금형 반경(die radius, DR), 비드 높이(bead height, BH), 마찰력(friction, μ) 등 다양한 공정변수가 존재하며, 스프링백에 복합적인 영향을 미친다[29]. 따라서, 실 부품 성형 시 단순히 몇 가지 변수만 바꿔가며 시행착오를 거쳐 부품의 스프링백을 정확히 예측하기 어렵다. | |
시행착오를 통해 스프링백을 줄여가는 방식의 문제점은? | 차체 부품에 3세대 초고장력강판 적용 검토 시, 형상 동결성 확보를 위해 유한요소해석을 이용하여 공정변수를 바꿔 가며 성형성 및 형상 동결성을 검토하고 실제 부품 성형을 통해 결과 비교 후 금형을 수정하는 시행착오를 통해 스프링백을 줄여가는 방식으로 부품 개발을 진행하고 있다. 이 방법은 부품 개발 시 시간 소모 및 비용이 크게 들고, 각 공정변수가 스프링백에 영향을 미치는 정도를 직관적 으로 이해하기 어렵다. | |
다양한 초고강도강 소재를 차체에 적용시켜 차체 경량화 및 충돌 안정성을 향상시키려는 노력을 하고 있는 이유는? | 강화된 환경규제 및 안전규제에 대응하고자 자동차사에서는 다양한 초고강도강 소재를 차체에 적용시켜 차체 경량화 및 충돌 안정성을 향상시키려는 노력을 하고 있다[1-4]. 최근에는 이러한 흐름에 맞춰 기존의 이상조직강(dual phase steel)[5,6]이나 변태유기소성강(transformation induced plasticity, TRIP)[7,8] 같은 고강도강 대비 기계적 특성이 우수하면서도 원가경쟁력도 갖춘Quenching and partitioning강[9,10], 중망간강[11,12], TRIP-aided bainitic ferrite강[13,14] 등 저합금원소 설계 기반 3세대 초고강도 강종들이 개발되고 있다. |
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