• 대한기계학회논문집A
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• 제24권7호
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• pp.1650-1660
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• 2000

Continuous casting process has been adopted increasingly in recent years to save both energy and labor. It has experienced a rapid development in the production of semi-finished steel products, rep lacing the conventional route of ingot casting and rolling. In order to achieve this merit, however, more studies about the mechanism between roll and slab are needed. In this paper, a dynamic bulging in steel cast slabs was simulated by considering the solidification and heat transfer. This study is to prevent internal cracks of a slab in a bending and unbending zone. The value of moving strand shell bulging between two supporting rollers under the ferrostatic pressure and slab-self weight has been calculated in terms of creep and elasto-plasticity. The strain and strain rate distributions in solidified shell undergoing a series of bulging are calculated with working boundary conditions.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1364-1367
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• 1996

Recently, direct rolling process, called as strip casting process, has been interested in to save production cost by reducing forming processes. In direct rolling process, since a steel strip of thickness 1-5(mm) can be produced directly from molten metal, it can eliminate secondary hot rolling process. On the other hand, since many process variables are existed in this process and relation of these variables is very complex, it is difficult to realize the process design and the quality control. In this paper, as first step to overcome above difficulties, the quantitative relationship of the process variables affected to quality of the strip has been carried out through the numerical analysis. Also, we determined the process variable to monitor the quality in the direct rolling process. As a result, we show that the solidification final point, called as Nip point, was related directly to quality of the strip.

• 한국산학기술학회논문지
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• 제8권6호
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• pp.1537-1542
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• 2007

본 논문에서는 기존 I형강 매입형 강합성 바닥판을 기본으로 새로운 형식의 초간편 강합성 바닥판 거더패널을 제시하여 가설중 거동에 대해 연구하였다. 범용해석프로그램인 ABAQUS를 사용하여 바닥판을 구성하는 인자에 대하여 영향을 평가하였다. 하부강판과 I형강의 용접량 변화, 1형강의 복부에 유공 유무, 유공의 위치변화에 대해 평가하였다. 또한 모델링의 합리적 검증을 위해 수계산, Shell요소, Solid요소 모델을 사용하여 비교하였다. 그 결과 하부강판과 I형강의 용접량 변화시 전체용접에 비해 부분용접시 지간 중앙부 단면에서 최대 휨 인장응력이 증가함을 확인할 수 있었다. 또한 유공이 있는 경우 유공이 없는 경우보다 처짐량이 약간 증가함을 확인할 수 있었다.