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이추실(Q. S. Li),이민철(M. C. Lee),정동찬(D. C. Jung),손요헌(Y. H. Son),전만수(M. S. Joun) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
In this paper, effects of major design parameters of cold forging dies on die mechanics are quantitatively investigated with emphasis on shrink fit using a thermoelastic finite element method. A ball-stud cold forging process found in a cold forging company is selected as a test process and the effects of die insert material, shrink fit, dimension of ring, partition of die inert and clamping force on effective stress and circumferential stress are analyzed.
열간 알루미늄 롤단조 공정의 유한요소해석과 실험적 검증
엄재근(J. G. Eom),이추실(Q. S. Li),이민철(M. C. Lee),전만수(M. S. Joun),정순종(S. J. Jung),박건형(G. H. Park),곽양섭(Y. S. Gwak) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In this paper, an aluminum ring forging process of manufacturing an optimizes perform for a hot forging process is simulated using AFDEX 3D, a general-purpose metal forming simulator based on rigid-thermoviscoplastic finite element method. Non-isothermal analysis is carried out and the predictions are compared with the experiments in terms of dimensional accuracy. It was shown that the predictions are in good agreement with the experiments.
The effect of tensile properties on hole-expansion properties of sheets
M. Li(이민),B. D. Joo(주병돈),Y. Y. Woo(우영윤),Y. H. Moon(문영훈) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
This study aims to investigate the effect of tensile properties on hole-expansion properties. Six different (high manganese steel, SUS201, SUS202, SUS304L, SUS316L and SUS430) sheets with a thickness of 3.0mm was selected for this study. Uniaxial tension test was performed to characterize the tensile properties of the sheets. The results of hole expansion experiments were compared with the results of finite element simulations.
우영윤(Y. Y. Woo),이민(M. Li),강형석(H. S. Kang),황태우,문영훈,T. W. Woo 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
The flexible roll forming process makes it possible to produce profiles with a variable width by controlling the roll stands with CNC. But profile with variable cross-sections by flexible roll forming has a shape defects, so called buckling. Buckling occurs due to the geometrical deviations which cause longitudinal residual stress in the transitional zones of the profile between the initial metal strip and the roll-formed profile. Therefore in this study, the effect of forming parameters of metal blank on the longitudinal and shape error which are affected by several parameters have been performed to prevent buckling. The parameter investigated in this study is the forming angle. For the flexible roll forming experiments, symmetrical U-sections are formed from advanced high strength steel (AHSS) blank. Numerical simulations by finite element analysis have also been performed to analyze strain variations during roll forming. The tracing of incremental strains at the edge may provide insights to solve buckling problems. From the analysis results, the behavior of buckling in flexible roll forming process can be predicted with relation between geometry parameters and longitudinal and shape error.
가변 단면을 가지는 비대칭 얇은 관 부품의 액압 성형 연구
강형석(H. S. Kang),주병돈(B. D. Joo),이민(M. Li),황태우(T. W. Hwang),문영훈(Y. H. Moon) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
Hydroforming of non-axisymmetric thin-wall tubular component with variable cross sections was analyzed. In order to solve sealing problem occurred due to thin and non-axisymmetric shape, punch available on hydroforming experiment with thin tube was suggested. Lead patch was attached to the punch to solve sealing problem occurred due to the stress gradient on the non-axisymmetric shape. FEM and experiments have also been performed to analyze these sealing problems associated with the punch shape and non-axisymmetric shape. Finally, lead patch is attached at tube surface where intensive local strain concentration would occur to enhance hydroformability. These methods were successfully used to fabricate non-axisymmetric thin-wall tubular component with variable cross sections that had previously failed during traditional hydroforming processing.