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엄재근(J. G. Eom),강신길(S. K. Kang),김진우(J. W. Kim),김민철(M. C. Kim),박건형(K. H. Park),정순종(S. J. Jung),이민철(M. C. Lee),전만수(M. S. Joun) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
In this paper, a sequence of compound metal forming processes composed of four roll forging processes, a bending process and two conventional closed die forging processes developed for manufacturing a lower arm with highest yield of material is simulated. The detailed process design is introduced with emphasis on the roll forging processes for manufacturing an optimized preform. The predictions are compared with the experiments and it is shown that they are in close agreement.
Al6061의 고온변형특성 및 단조 시뮬레이션 적용을 통한 검증
엄재근(J. G. Eom),장성민(S. M. Jang),이민철(M. C. Lee),정순종(S. J. Jung),박건형,곽양섭,전만수(M. S. Joun) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
In this paper, flow stress of Al6061 is obtained by compression test in the range of temperature from 300℃ to 550℃ and effective strain-rate from 0.1/s to 20.0/s. The flow stress information is used to simulate an aluminum hot forging process. Non-isothermal simulation is carried out by a rigid-thermoviscoplastic finite element method. The predictions are compared with the experiments terms of the deformed shape of material.
열간 알루미늄 롤단조 공정의 유한요소해석과 실험적 검증
엄재근(J. G. Eom),이추실(Q. S. Li),이민철(M. C. Lee),전만수(M. S. Joun),정순종(S. J. Jung),박건형(G. H. Park),곽양섭(Y. S. Gwak) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In this paper, an aluminum ring forging process of manufacturing an optimizes perform for a hot forging process is simulated using AFDEX 3D, a general-purpose metal forming simulator based on rigid-thermoviscoplastic finite element method. Non-isothermal analysis is carried out and the predictions are compared with the experiments in terms of dimensional accuracy. It was shown that the predictions are in good agreement with the experiments.
김성현(S. H. Kim),서성렬(S. Y. Seo),정순종(S. J .Jung),전만수(M. S. Joun) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
In this paper, finite element approach is applied to reveal causes of punch fracture occurred in cold forging of a simple axi-symmetric part. Finite element results show that the forging process has nothing to do with the punch fracture and thus we try to find the cause from the ejection process. The mechanical situation during the ejection process is considered as the same with that at the final stroke of the forging process only except that the interfacial stress along the punch and material is free. We can predict the interference between punch and material, which first causes damage on the coated die surface leading to final fracture of the punch.
긴 단조품의 측방향 열간 단조공정 중 금형의 실용적 구조해석 기술에 관한 연구
김민철(M. C. Kim),엄재근(J. G. Eom),박건형(G. H. Park),강신길(S. G. Kang),정순종(S. J. Jung),전만수(M. S. Joun) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
In this paper, a useful two-dimensional finite element approach is applied to structural analysis of dies in hot lateral forging of long parts. Three-dimensional forging simulation and die structural analysis are conducted for an aluminum hot forging process of the front lower control arm of an automobile and their results are criticized in terms of application for improving designs of process or die. Two dimensional approach for engineering design is proposed especially for prediction of stress concentration with higher accuracy when the material is long compared to its diameter and it is applied to the process to solve the local problem. It is shown that the predictions of two dimensional approach is very close to those of three-dimensional approach if the velocity Component normal to the plane selected for two dimensional analysis is negligible.