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전만수(M. S. Joun),엄재근(J. G. Eom),정완진(W. J. Chung) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In this paper, finite element analyses of springback phenomenon and residual stress of a plate forging process after being simulated by two finite element methods, i.e., rigid-plastic and elastoplastic finite element methods are conducted. The predictions based on two approaches are compared. The comparison shows that the two predictions are in qualitative agreement with each other, implying that the rigid-plastic finite element approach can be employed for approximate predictions of springback phenomenon and residual stress.
홍석무(S. M. Hong),황지훈(J. H. Hwang),심재원(J. W. Sim),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, a three-dimensional elastoplastic finite element analysis is conducted to reveal the fracture occurring in plate forging of a clad plate. Formability limit diagram (FLD) technique is applied in the clad material which is thin enough for FLD technique to be applied. To obtain reliable predictions, special finite element mesh system is employed. The predictions are compared with experiments, showing that they are in good agreement with each other.
하중 및 변위 동시 구속 목적의 금형을 취급하기 위한 그림자 금형
전만수(M. S. Joun),엄재근(J. G. Eom),정완진(W. J. Chung) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In this paper, a plate forging simulation technique is presented with emphasis on a special compound die, which moves with given velocity in the early stage and exerts the prescribed force on the material after its forming load exceeds the given force. The velocity of the shadow die which has direct influence especially on friction is determined by its displacement divided by time increment of the previous solution step. A typical test example of a plate forging process is studied by two- and three-dimensional finite element simulation techniques.
액슬하우징의 온간 후 판단조에서 모서리 박육 방지를 위한 장치의 개발
김장섭(J. S. Kim),김기수(K. S. Kim),심상현(S. H. Shim),엄재근(J. G. Eom),전만수(M. S. Joun) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
In this paper, a novel warm plate forging process of an axle housing is presented. A die system is proposed to reduce the inherent thickness reduction along the bent comer of the product which deteriorates structural strength and fatigue life in its service. The mechanism of the die system is given and its effect on comer thickness of the product is revealed by two dimensional finite element analysis under plain strain assumption. Three-dimensional finite element solutions are also given to verify validity of the two dimensional approach. The die system has been successfully applied to manufacturing the axle housings of medium or large trucks.