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신동엽(D. Y. Shin),신종대(J. D. Shin),유병돈(B. D. You),오상훈(S. H. Oh),이동희(D. H. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
The effect of optimum condition of the exothermic & insulating materials for exothermic heat value increase by using the change of the thermal properties of exothermic & insulating materials with mixing condition of raw materials. Small steel ingot advantage that NAl/NFe2O3 is increase and size is small. Large steel ingot advantage that expansion graphite and bum rice bran contain large amount.
김도준(D. J. Kim),신동엽(D. Y. Shin),변승용(S. Y. Byun),위창현(C. H. Wi),유병돈(B. D. You),오상훈(S. H. Oh) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The change of the thermal properties of exothermic & insulating materials with mixing condition of raw materials which is the most important factor for exothermic & insulating materials was investigated by using the evaluation system of the thermal properties of exothermic & insulating materials. In this study, the effect of the thermal properties of the exothermic & insulating materials such as exothermic properties, endothermic properties, insulating properties, maximum temperature of molten metal, ignition time of exothermic & insulating materials and temperature recovery time on the mixing ratio of reductant and oxidant, types of reductant, and particle sizes of reductants was examined. It could be expected to design the mixing condition of raw materials for various exothermic & insulating materials.
논문 : 제조공정 ; SCM 440 빌렛트의 수평 연속주조시 표면품질에 미치는 인발 사이클과 주조속도의 영향
이병화 ( B. H. Lee ),유병돈 ( B. D. You ),김목순 ( M. S. Kim ),정일권 ( I. K. Jung ),윤황로 ( H. R. Yoon ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.7
Trial tests were made to examine the effects of casting pattern on the surface quality of SCM 440 billets in horizontal continuous casting. The withdrawal cycle and the casting speed were varied 40~80 cycle/min and 0.7~1.0 m/min respectively. The main results obtained could be summarized as follows: When the withdrawal cycle is low, the withdrawal mark is irregular and the surface of billet is rough due to the formation of the lapped skin. The increase of withdrawal cycle results in the uniform withdrawal mark and the fine surface of cast products. The very low or the very high withdrawal cycle is essential for the prevention of transverse cracks on surface and corner cracks of the billet. For the case of the withdrawal cycle of 50 cycle/min, the effects of casting speed on the formation of transverse cracks and on the surface roughness could not be justified accurately due to the formation of lapped skin. The casting speed does not affect, however, the formation of the corner crack.