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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.
지지디스크와 지지판에 의한 Mannesmann 롤피어싱 공정의 비교 연구
조재민(J. M. Cho),유석재,문호근(H. K. Moon),전만수(M. S. Joun) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
In this paper, comparative study on a Mannesmann roll piercing process with respect to supporting equipment including Diecher"s guiding disc and Stiefel"s guiding plate or shoe is carried out. A Mannesmann roll piercing process is found from the literature and the same process conditions and geometries except the supporting equipment are used for the two cases. Predictions of the processes with different supproting equipments show distinct difference in plastic deformation. It has been shown that the Diecher"s type is the better of the two in terms of ellipticity but that the Stiefel"s type is to the contrary for spatial efficiency.