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정승원(S. W. Jeong),이성원(S. W. Lee),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
In this paper, a reaction-to-die penetration scheme is presented to deal with the force prescribed dies such as the binders in sheet forming or plate forging, the guide plate and counter punch in fine blanking and the spring attached die and back pressing die in forging. A holding force die is employed to define the region where the force is exerted. In the scheme, the holding force is exerted in the material surface in terms of traction which is calculated by a function of penetration depth of material into the die. The scheme is applied to a fine blanking process using a rigid-plastic finite element method. The traction can be regarded as a kind of reaction force to protect the penetration of material into the holding force die. The predictions are discussed to reveal the effect of the reaction-to-die penetration scheme.
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.