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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.
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.