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김영신(Y. S. Kim),임재곤(J. G. Lim),전만수(M. S. Joun) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
In this study, die elastic deformation considered simulation of an aluminum fixed scroll forging process, a kind of forward extrusion process, is conducted, which is very special because of complexity in die geometries. The material is assumed rigid-viscoplastic and the dies are elastically behaved. The predictions are compared in terms of dimensions and forming load with the other predictions obtained without consideration of die elastic deformation during forging. The reasons of die fracture occurring in hot aluminum forging of a fixed scroll are revealed using finite element predictions.
초기소재 형상 및 위치가 고정 스크롤 알루미늄 열간단조 금형 수명에 미치는 영향 분석
정승원(S. W. Jeong),김영신(Y. S. Kim),임재곤(J. G. Lim),우영부(Y. B. Woo),박준열(J. Y. Park),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, effect of initial material geometry and position on die stress is investigated using finite element analysis. Various geometries and positions of initial workpiece are considered to reveal their effect on the die stress, especially in the region where tensile stress is exerted, which is supposed to cause premature die fracture. It has been found that proper geometry of initial workpiece can increase die life much longer than expected because it can reduce the die stress in tension by about 34 percent only with radius of initial material reduced and its center fixed near the point where premature die fracture occurred. An optimized tilted material can also reduce the die stress in tension by about 25 percent compared with the flat material with same radius.
고정 스크롤 단조 공정 중 발생한 금형 파괴 원인 분석
정승원(S. W. Jeong),우영부(W. B. Woo),임재곤(J. G. Lim),전만수(M. S. Joun) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
In this paper, the reasons of die fracture occurring in hot aluminum forging of a fixed scroll are investigated using finite element analysis. A forging process tried out to develop an aluminum scroll for medium-sized electric vehicle is simulated using a rigid-thermoviscoplastic finite element method and the predictions of stresses along the die=material interface are employed for die structural analysis. The effective stress of die and y-directional stress component is examined to reveal the reason of die fracture, revealing that excessive bending stress due to flow unbalance induced lateral force exerted on the warp, i.e., protruded die part leads to the die fracture.
금형과 소재의 형상이 고정스크롤 열간단조 금형의 파괴에 미치는 영향분석
김영신(Y. S. Kim),정승원(S. W. Jeong),임재곤(J. G. Lim),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
In this paper, effects of geometric parameters of dies and material on die stress in hot forging of aluminum fixed scrolls are investigated using a finite element simulation technique. The cause of die fracture occurring in hot forging of an aluminum fixed scroll is introduced, emphasizing that the die fracture occurs due to bending stress in tension at the root of the die. Finite element predictions for various titled angles of die and material to induce the metal flow into difficult-to-fill region are considered and they were analyzed to reveal their effects on the die stress near the fracture point. It was shown that optimized material and die parameters can be helpful to prevent premature of unpredicted die fracture in this process.