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Engineering Study on Twin Roll and Thin Slab Caster

쌍롤식 박판주조기와 박슬래브주조기의 엔지니어링 연구

김병훈 (Byounghoon Kim, 포항공과대학교)

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초록 moremore
This study introduces how to enhance the castability for near-net-shape casting especially for the Twin Roll strip Casting (TRC) and Thin slab Casting (TSC). The flow control of sump in the TRC is direct influence to the quality of products, so the design of the Submerged Entry Nozzle (SEN) which su...
This study introduces how to enhance the castability for near-net-shape casting especially for the Twin Roll strip Casting (TRC) and Thin slab Casting (TSC). The flow control of sump in the TRC is direct influence to the quality of products, so the design of the Submerged Entry Nozzle (SEN) which supply molten iron to the sump should be carefully determined. If the hole of SEN designed vertical downward, the molten iron flowed directly to the nip, then, almost one half of sump volume remained static and below solidus temperature. To solve this unexpected flow pattern, two types of horizontal SEN was investigated. One had holes, commonly used in the commercial plants, and the other had newly designed slits. However both of them had good flow patterns for solidification, the edge area still remained static. To stir this static flow, the Electromagnetic Stirring (EMS) was applied. EMS systems which were installed above the meniscus made induced magnetic field and current density to the sump. These generated Lorentz force and accelerated flow of the edge area.  To ensure the even solidification of the shell for the TSC, the arrangement of coolant hole of funnel mold was investigated. There were dozens of coolant hole inside the mold, it was almost impossible to adjust each holes for even temperature distribution at the hot surface of the copper plate. To solve this problem, analyzing optimal heat transfer to the center profile of coolant hole was executed. The resultant optimal profile which remained smooth halved temperature deviation on the hot surface compared to the original design.
목차 moremore
ABSTRACT i
목 차 iii
표 목록 vi
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ABSTRACT i
목 차 iii
표 목록 vi
그림 목록 vii
명명법 ix

I. 서론 1
1. 최종형상근접 주조의 발전 과정 1
2. 전자기장을 활용한 용강 흐름 제어기술 4
3. 연구의 필요성 7
4. 기존 연구 9
II. 이론적 배경 11
1. 자기유체역학 11
1.1. 유동 방정식 11
1.2. 전자기 방정식 12
1.3. 유도 방정식 14
1.4. 로렌츠 힘 16
2. 체류시간분포 19
3. 온도 검증 및 세극형 침지노즐 21
4. 냉각홀에서의 열전달 23
III. 쌍롤식박판주조의 전자기교반 24
1. 연구 목표 24
2. 해석 절차 및 조건 25
2.1. 유동 해석 조건 27
2.2. 전자기장 해석 조건 29
2.3. 자기유동 해석 조건 32
3. 결과 및 고찰 33
3.1. 유동 해석 결과 33
3.2. 자기유동 해석 결과 38
3.3. 고찰 44
IV. 박슬래브주조의 몰드 온도 최적화 46
1. 연구 목표 46
2. 해석 절차 및 조건 47
2.1. 형상 분석 47
2.2. 최적화 해석 조건 49
2.3. 열전달 해석 조건 50
3. 결과 및 고찰 51
3.1. 최적화 해석 결과 51
3.2. 열전달 해석 결과 53
3.3. 고찰 55
V. 결론 56
1. 연구 요약 및 결론 56
2. 연구의 한계점 및 향후 연구 방향 58

REFERENCES 60