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한승상(S. S. Han),엄재근(J. G. Eom),장성민(S. M. Jang),이민철(M. C. Lee),전만수(M. S. Joun),강신준(S. J. Kang),손요헌(Y. H. Son) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In this paper, limitation of rigid-plastic finite element method caused from rigid-plasticity assumption and numerical problem is investigated in detail and a useful scheme is proposed to get rid of the plastic deformation in rigid or elastic region, A typical example of a possible long bar extrusion process is given, which may be impossible to simulate without using the proposed scheme. The scheme is successfully applied to simulating the long bolt forging process.
장수진(S. J. Jang),이민철(M. C. Lee),한승상(S. S. Han),윤덕재(D. J. Yoon),전만수(M. S. Joun) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
In this paper, three-dimensional finite element analysis of screw rolling process of a long shaft bolt is conducted by using a rigid-plastic finite element method based metal forming simulator AFDEX 3D. A whole sequence of cold forming processes of a long shaft bolt composed of forging and screw rolling processes is simulated to reveal the mechanism of screw formation. A mesh density control function is applied near the major plastic deformation region to achieve computational efficiency.
나사 전조공정 해석모델에 제안 및 화산 모양의 변형형상의 예측
이민철(M. C. Lee),장수진(S. J. Jang),한승상(S. S. Han),손요헌(Y. H. Son),윤덕재(D. J. Yoon),전만수(M. S. Joun) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
In this paper, three-dimensional finite element analysis of screw rolling process of a 12 point flange head bolt is conducted using a rigid-plastic finite element method based metal forming simulator AFDEX 3D. An analysis model is proposed to carry out detailed simulation of thread formation, especially prediction of volcano shape crest. The model is composed of a slice of material, two artificial symmetric planes, and two tapered or flat thread rolling dies. It is applied to a thread rolling process of the 12 point flange bolt with multi-thread and small pitch and depth and the formation of thread including the volcano shape crest is revealed in detail.