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[論文] 旋盤의 移送裝置部의 컴퓨터利用設計에 관한 硏究
염영하(Y. H. Yum),이장무(J. M. Lee),이원희(W. H. Lee) 한국자동차공학회 1983 오토저널 Vol.5 No.1
As a basic study on the machine tools of modular structure, a Computer Aided Design of feed driving unit and an optimization of the dynamic characteristics of a machine tool structure are carried out.<br/> Computer-aided design technique enables designers to save time and to easily do the job in variant design by effectively documenting design techniques and data. In this study a computer program package was developed for automatic design of a proper feed driving units by utilizing building block principle of IOWA CADET.
전기방전소결을 이용한 Ti-Ni-Zr 준 결정상의 상변화 연구와 Ti, W 다공체 제작
조재영,송기안,이민하,이효수,이원희,김기범,Cho, J.Y.,Song, G.A.,Lee, M.H.,Lee, H.S.,Lee, W.H.,Kim, K.B. 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.2
Electro-Discharge Sintering (EDS) employs a high-voltage/high-current-density pulse of electrical energy, discharged from a capacitor bank, to instantaneously consolidate powders. In the present study, a single pulse of 0.57-1.1 kJ/0.45 g-atomized spherical $Ti_{52}Zr_{28}Ni_{20}$ powders in size range of 10~30 and $30\sim50{\mu}m$ consisting of ${\beta}$-(Ti, Zr) and icosahedral phases were applied to examine the structural evolution of icosahedral phase during EDS. Structural investigation reveals that high electrical input energy facilitates complete decomposition of icosahedral phase into C14 laves and ${\beta}$-(Ti, Zr) phases. Moreover, critical input energy inducing decomposition of the icosahedral phase during EDS depends on the size of the powder. Porous Ti and W compacts have been fabricated by EDS using rectangular and spherical powders upon various input energy at a constant capacitance of $450{\mu}F$ in order to verify influence of powder shape on microstructure of porous compacts. Besides, generated heat (${\Delta}H$) during EDS, which is measured by an oscilloscope, is closely correlated with powder size.
Ti 및 Si 혼합 분말의 전기방전소결에 의한 Titanium Silicide의 합성 연구
천연욱,오낙현,김영훈,변창섭,이상호,이원희,Cheon Y. W.,Oh N. H.,Kim Y. H.,Byun C. S.,Lee S. H.,Lee W. H. 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.6
The synthesis and consolidation of titanium silicide by electro-discharge-sintering has been investigated. As-received Ti powder was in flaky shape and the mean particle size was $45.0{\mu}m$, whereas the mean particle size of the pre-milled Si powder with angular shape was $8.0{\mu}m$. Single pulse of 2.5 to 5.0 kJ/0.34g-elemental Ti and pre-milled Si powder mixture with the composition of $Ti-37.5at.\%$ Si was applied using $300{\mu}F$ capacitor. The solid with $Ti_5Si_3$ phase has been successfully fabricated by the discharge with the input energy more than 2.5kJ in less than $129{\mu}sec.$ Hv values were found to be higher than $1000kgf/mm^2$. The formation of $Ti_5Si_3$ occurred through a fast solid state diffusion reaction.
Hydroxyapatite가 도핑된 Ti-6Al-4V 구형 분말의 전기방전 소결 및 소결체 특성에 관한 연구
조유정,김영훈,조예현,김민재,김현수,김승우,박정환,이원희,Cho, Y.J.,Kim, Y.H.,Jo, Y.H.,Kim, M.J.,Kim, H.S.,Kim, S.W.,Park, J.H.,Lee, W.H. 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.5
Spherical Ti-6Al-4V powders in the size range of 250 and 300 ${\mu}m$ were uniformly doped with nano-sized hydroxyapatite (HAp) powders by Spex milling process. A single pulse of 0.75-2.0 kJ/0.7 g of the Ti-6Al-4V powders doped with HAp from 300 mF capacitor was applied to produce fully porous and porous-surfaced Ti-6Al-4V implant compact by electro-discharge-sintering (EDS). The solid core was automatically formed in the center of the compact after discharge and porous layer consisted of particles connected in three dimensions by necks. The solid core increased with an increase in input energy. The compressive yield strength was in a range of 41 to 215 MPa and significantly depended on input energy. X-ray photoelectron spectroscopy and energy dispersive x-ray spectrometer were used to investigate the surface characteristics of the Ti-6Al-4V compact. Ti and O were the main constituents, with smaller amount of Ca and P. It was thus concluded that the porous-surfaced Ti-6Al-4V implant compacts doped with HAp can be efficiently produced by manipulating the milling and electro-discharge-sintering processes.