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제1세대 허브베어링 외륜의 단조와 링롤링 중 발생한 단류선 변화
최무호(M. H. Choi),정승원(S. W. Jeong),전만수(M. S. Joun) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this paper, a full sequence of manufacturing process of outer race of the first generation hub bearing for passenger’s car is simulated with emphasis on tracing metal flow lines. The importance of metal flow lines in forging of the bearing is emphasized to enhance structural rigidity and product quality of bearings. A viscoplastic finite element method is employed with a special scheme of tracing the metal flow lines. The predictions are compared with experiments, revealing that they are in good agreement with each other. The final metal flow lines are evaluated considering the function of the first generation bearing outer race.
유동응력, 마찰, 온도, 속도 등이 단조 중 단류선의 유한요소예측에 미치는 영향
최무호(M. H. Choi),진호태(H. T. Jin),전만수(M. S. Joun) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
In this paper, effect of flow stress, friction, temperature and velocity on finite element predictions of metal flow lines in upsetting. An actual three-stage hot forging process involving an upsetting process is utilized and experimental metal flow lines are employed to study the effect. It has been found that appropriate friction, temperature and velocity has little influence on metal flow lines located especially deep inside material but that flow stress has direct influence on them and a pure power law cannot reflect the real flow stress of hot material because it underestimate the flow stress around the dead-metal zone. It is thus recommended that a proper bottom limit of flow stress be assumed to deviate from the problem.
전체 사면체 요소를 이용한 링롤링 공정의 유한요소 해석
최무호(M. H. Choi),정승원(S. W. Jeong),김봉수(B. S. Kim),김경훈(K. H. Kim),전만수(M. S. Joun) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In this paper, a ring rolling simulation technique based on full three-dimensional model discretized by tetrahedral elements is introduced with the related software module. The technique is assisted by a powerful mesh system specialized optimally for ring rolling simulation and parallel processing technique to reduce computational time. The present approach is applied to an actual ring rolling process. The predictions are compared with experiments and the predictions obtained by a hexahedral dual mesh approach, revealing that they are in good agreement.
허브베어링 조립체의 조립을 위한 회전단조 공정의 해석 모델
최무호(M. H. Choi),김민철(M. C. Kim),남찬희(C. H. Nam),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
In this paper, a finite element model of the rotary forging process for assembling a hub bearing assembly is presented. The analysis model is composed of a section of material with two artificial planes of symmetry, which is to reduce computational time taken in simulating the holistic process. The predictions at the mid-plane of the analysis models of 30°, 60°, 90° are compared to reveal the validity of the presented analysis model. They are also compared with the experiments in terms of the deformed shape.
가이드 롤의 모델링 및 이를 이용한 링롤링 공정의 해석
진호태(H. T. Jin),김경률(K. R. Kim),김응주(E. J. Kim),최무호(M. H. Choi),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, a ring rolling simulation technique based on full three-dimensional model discretized by tetrahedral elements with emphasis on a new guide roll model is presented. The new guide roll model is devised to reflect spring-like behaviors in real situations. The technique is assisted by a powerful mesh system specialized optimally for ring rolling simulation and parallel processing technique to reduce computational time and applied to an artificial profile ring rolling process modified from a real ring rolling process.
심규하(G. H. Shim),김도균(D. G. Kim),최무호(M. H. Choi),김응주(E. Z. Kim),전만수(M. S. Joun) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In this study, an optimized forging process for assembling hub bearing assembly is proposed. The shape of initial material is optimized to minimize forging load. The outer shape of inner race of the bearing is also improved not only to minimize forging load but also to reduce the total weight of the hub bearing assembly. The initial material with the inner race for rotary forging needs about 140 tons to be forged while the proposed design needs about 70 tons to be forged.
중소형 내경 또는 외경 형상 열간 링롤링 공정의 시뮬레이션
김봉수(B. S. Kim),김응주(E. J. Kim),김경률(K. R. Kim),최무호(M. H. Choi),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
In this paper, a rigid-plastic finite element method is applied to simulating a ring rolling process. A warm or hot ring rolling process for a ball bearing outer race with profiled inner diameter and an automobile part with profiled outer diameter are studied by experiments and predictions. The predictions are compared with the experiments in terms of major dimensions, showing that they are quantitatively close to each other.