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유한요소해석을 이용한 세장비가 큰 직사각컴 다단계 성형공정의 금형설계 - Part I. 금형설계
김세호,김승호,허훈,Kim, S.H.,Kim, S.H.,Huh, H. 한국소성가공학회 2001 소성가공 : 한국소성가공학회지 Vol.10 No.2
Tool design is introduced in a multi-stage rectangular cup drawing process with the large aspect ratio. Finite element simulation is carried out to investigate deformation mechanisms with the initial tool design. The analysis reveals that the difference of the drawing ratio and the irregular contact condition produces non-uniform metal flow to cause wrinkling and severe extension. For remedy, the modification guideline is proposed in the design of the tool and process. Analysis results confirm that the modified tool design not only improves the quality of a deep-drawn product but also reduces the possibility of failure.
유럽의 뜨거운 정보통신 열기 느낄수 있어-CeBIT '95를 다녀와서
김세호,Kim, Se-Ho 한국정보통신집흥협회 1995 정보화사회 Vol.89 No.-
정보통신 관련 박랍회로는 세계 최대규모인 "CeBIT '95"를 통해 초고속정보통신기반구축을 위해 부산한 움직임을 보이고 있는 국내 정보통신산업의 현주소를 점검한다.
유한요소해석을 이용한 세장비가 큰 직사각컵 다단계 디프 드로잉-아이어닝 공정의 최적 금형설계
김세호,김승호,허훈,Kim, Se-Ho,Kim, Seung-Ho,Huh, Hoon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
Optimum tool design is carried out fur a multi-stage rectangular cup deep-drawing and ironing process with the large aspect ratio. Finite element simulation is carried out to investigate deformation mechanisms with the initial design made by an expert. The analysis considers the deep drawing process with ironing for the thickness control in the cup wall. The analysis reveals that the difference of the drawing ratio within the cross section and the irregular contact condition produce non-uniform metal flow to cause wrinkling and severe extension. For remedy, the modification guideline is proposed in the design of the tool and the process. Analysis results confirm that the modified tool design not only improves the quality of a deep-drawn product but also reduces the possibility of failure. The numerical result shows fair coincidence with the experimental one. After tryouts of the tool shape, the rectangular cup has been produced in the transfer press.
직접미분 설계민감도 해석을 이용한 박판금속성형 공정변수 최적화 (I) -설계민감도 해석 -
김세호,허훈,Kim, Se-Ho,Huh, Hoon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.11
Design sensitivity analysis scheme is proposed in an elasto -plastic finite element method with explicit time integration using a direct differentiation method. The direct differentiation is concerned with large deformation, the elasto-plastic constitutive relation, shell elements with reduced integration and the contact scheme. The design sensitivities with respect to the process parameter are calculated with the direct analytical differentiation of the governing equation. The sensitivity results obtained from the present theory are compared with that obtained by the finite difference method in a class of sheet metal forming problems such as hemi-spherical stretching and cylindrical cup deep-drawing. The result shows good agreement with the finite difference method and demonstrates that the preposed sensitivity calculation scheme is a pplicable in the complicated sheet metal forming analysis and design.