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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.
이영선(Y. S. Lee),이명원(M. W. Lee),이승욱(S. W. Lee),이동희(D. H. Lee),김상식(S. S. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
Ring forging process is more appropriate for high-length and thin walled ring, because it utilizes the forging press and hence does not require heavy-duty ring rolling mill. Although ring forging process is very simple and economic for facilities, the process is not efficient because of multi-forging-step and low material utilization. An effective ring forging process is developed using a hollow ingot. When a hollow ingot is used with a workpiece, the ingot can be forged into a final ring without multi-stage pre-forging process, such as, cogging, upsetting, and piercing, etc.. Finally it has advantages of the material utilization and process improvement because few reheating and forging process are not necessary to make workpiece for ring forging. The important design variables are applied plastic deformation energy to eliminate cast structure and make uniform properties. In this study, the mechanical properties of forged shell were investigated by the experiment using sectional model and also the process conditions were designed by Fern simulation.