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RISS 인기검색어
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- 저자 : 서영호(Y. H. Seo) (검색결과 257 건)
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용탕단조법에 의하여 제조한 $SiC_p$/Al 복합재료의 2차 성형공정이 기계적 성질에 미치는 영향
서영호,강충길,Seo, Y.H,Kang, C.G 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11
A metal matrix composites(MMCs) for A16061 reinforced with silicon carbide particles is fabricated by melt-stirring method. The primary products of MMCs billets are prepared by volume fractions 5 vol% to 20 vol% and particle size $13\mu m$ to $22\mu m$.This paper will be made to examine the microstructure and mechanical properties of fabricated $SiC_p$/Al 6061 composite by melt-stirring and squeeze casting method. The MMC billets is extruded at $500^{\circ}C$ under the constant extrusion velocity $V_e$=2mm/min using curved shape die. Extrusion force, particle rearrangement, micro structure and mechanical properties of extruded composites will be investigated. The mechanical properties of primary billets manufactured by melt-stirring and squeeze casting method will be compared with extrusion specimen. The effect of volume fraction and size of the reinforcements will be studied. The increase in uniformity of particle dispersion is the major reason for an improvement in reliability due to hot extrusion with optimal shape die. Experimental Young's modulus and 0.2% offset yield strength for the extruded MMCs will be compared with theretical values calculated by the Eshelby method. A method will be proposed for the prediction of Young's modulus and yield strength in $SiC_p$ reinforced MMCs.
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유한요소법을 이용한 가변스테레치성형 공정변수와 성형오차의 상관관계 연구
서영호(Y. H. Seo),허성찬(S. C. Heo),강범수(B. S. Kang),김정(J. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
In this study, a correlation analysis between a process variable and shape error in a flexible stretch forming is conducted using finite element method. The forming variables which affect to the shape error are punch size, objective curvature radius and elastic pad thickness. Numerical simulations for calculating of the shape error are carried out by factorial design. The shape error is calculated and the correlation analysis is also performed according to width and tensile directions. Consequently, the correlation coefficient is deducted and it describes that the shape error is in proportional to the punch size and is in inverse to the objective curvature radius and the elastic pad thickness.
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유한요소법을 이용한 가변 스트레치 성형공정의 적합성 검증
서영호(Y. H. Seo),허성찬(S. C. Heo),박중원(J. W. Park),송우진(W. J. Song),구태완(T. W. Ku),김정(J. Kim),강범수(B. S. Kang) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
This paper deals with a usefulness verification of stretch forming process using flexible die. The stretch forming method is widely used in aircraft and high-speed train industries for manufacturing of skin structure, which is made of sheet metal. A great number of solid dies are originally used and developed for specific shapes with respect to different curvature radii of the skin structures. Accordingly, flexible stretch forming process is proposed in this study. It replaces the conventional solid dies with a set of height adjustable discrete punches. A usefulness of the flexible die is verified through extensive numerical simulations of the stretch forming process for simply curved sheet plate. The elastic recovery in considered and formability evaluations are conducted through a comparison of symmetry plane configurations.
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금형 표면코팅이 소재 마찰계수와 드로잉 성형성에 미치는 영향
서영호(Y. H. Seo) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
There are various problems such as shape accuracy, weariness and deflection of the tool, and galling in sheet metal forming process depending on utilization of high strength steel. A heat treatment is carried out on the surface of forming tool in order to solve the mentioned problems. It has been demonstrated that the surface coating is effective in reducing wear. However, the fact that the surface properties may affect the characteristics of drawing formability cannot be overlooked. In this research an effect of surface coating, e.g., non-coating, TD (Thermo-Reactive Deposition and diffusion), PVD (Physical Vapor Deposition)_CrN, PVD_TiN, PVD_TiAlN, and PVD_TiCN, on characteristics of friction and drawing formability is considered.
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