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중공 장축 대두 실린더 제조를 위한 슬라이딩 금형 단조 공법의 개념설계
정승원(S. W. Jeong),장성민(S. M. Jang),문호근(H. K. Moon),전만수(M. S. Joun) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In this paper, a new forging process with a controlled sliding die is proposed to fabricate a long hollow cylinder with large head. The conceptual design is given. In the process, an end of seamless pipe of initial material is partially heated. A sliding die is used to prevent the heated region of the material from being buckled and its velocity is controlled to exert forming load upward in the early stroke and downward in the remaining stroke on the material. Finite element predictions of the conceptual design are given, indicating that the metal flows are sound even if the thickness and height of the head is very large compared to the thickness of the cylinder.
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.
정승원(S. W. Jeong),전만수(M. S. Joun) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
In this paper, three-dimensional finite element approach is attempted to simulate a high-aspect ratio piercing process of the plate which is thick compared to the radius of the diameter of pierced hole. The same process is simulated using axisymmetric approach to be compared with the three-dimensional approach emphasizing that much more attention should be paid to come over some difficulties in generating extremely fine mesh system around the piercing region and numerical problems due to remeshing.