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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.
대형 주·단조품의 온도 및 조직변화에 예측에 관한 연구
이명원(M. W. Lee),이영선(Y. S. Lee),이승욱(S. W. Lee),김상식(S. S. Kim),문영훈(Y. H. Moon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Good control of thermal energy helps to increase characteristics and eliminate defects of large cast-forged part, such as large sized forged shell. Thermal energy control is a important factor. We have studied about forging process and after heat treatment process by FEM simulation. There are three ways of process. Changes of temperature and microstructure for forged shell were predicted according to temperature declination in large cast-forged product. So we will be able to choose the proper time heat treatment conditions by FEM simulation.
이명원(M. W. Lee),이영선(Y. S. Lee),이승욱(S. W. Lee),이동희(D. H. Lee),김상식(S. S. Kim),문영훈(Y. H. Moon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Thermal energy control is a important factor in a large size casting and forging. Good control of thermal energy makes characteristics and defect of large cast-forged part, such as large sized forged shell. We have studied about not only large size ring forging process and after heat treatment by FEM simulation. Also, changes of temperature and microstructure for forged shell were predicted. Therefore, we can choose the proper heat treatment condition by FEA. The sectional properties confirmed by practical experiment and evaluation have presented possibilities of process design by computational analysis.