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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.
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),문영훈(Y. H. Moon) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
Ring rolling simulation gives rise to poor conditioned non-linear equations that require repeated solution. The associated computational costs are extreme making analysis impracticable in industry until now. The ring rolling process involves 3D non-steady flow and continuous change of radius and thickness of the ring workpiece. In this study, a commercial FEM code FORGE-Z/3™ is used to analyze the effect of mesh size of both ring and main roll. From the simulation results, we know that the appropriate ratio of mesh system for main roll and ring with respect to the calculation time and accuracy of calculated values of ring. Therefore, we can use to predict and find the typical values related with process values, that is rotation speed and feeding amount of tools.