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김기환(G. H. Kim),이석우(S. W. Lee),최헌종(H. Z. Choi),최영재(Y. J. Choi) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
As the optical communication industry is developed, the demand of optical communication part is increasing. ZrO₂ ceramic ferrule is very important part which can determines the transmission efficiency and information quality to connect the optical fibers. In general ZrO₂ ceramic ferrule is manufactured by grinding process because the demands precision is very high. For the precision grinding machining, it is very important that the error of feeding system is improved. Therefore, we estimated the dynamic characteristics in feeding system of ultra precision co-axial grinding machining system. Then, we performed the machining characteristics experiment.
다구치 방법을 이용한 지르코니아 세라믹스페룰의 연삭 가공 특성 평가
김기환(G. H. Kim),최영재(Y. J. Choi),홍원표(W. P. Hong),이석우(S. W. Lee),최헌종(H. Z. Choi) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
As the optical communication industry is developed, the demand of optical communication part is increasing. ZrO₂ ceramic ferrule is very important part which can determines the transmission efficiency and information quality to connect the optical fibers. In general ZrO₂ ceramic ferrule is manufactured by grinding process because the demands precision is very high. And the co-axle grinding process of ZrO₂ ceramic ferrule is to make its concentricity all of uniform before centerless grinding. This paper deals with the analysis of the process parameters such as grinding wheel speed, grinding feedrate and regulating wheel speed as influential factors, on the concentricity and surface finish developed based on Taguchi’s experimental design methods. Taguchi’s tools such as orthogonal array, signal-to-noise ratio, factor effect analysis, etc. have been used for this purpose optimal condition has been found out. Thus, if possible be finding highly efficient and quality grinding conditions.
반충환(Choong-Hwan Ban),이영진(Y.J. Lee),한동화(D.H. Han),권완성(W.S. Kwon),김기환(K.H. Kim),은종목,최규하(G.H. Choe) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
본 논문에서는 기존의 풀브리지 컨버터를 적용한 50kW 급속 충전 시스템을 구성하였을 경우에 발생하는 스위칭 손실과, 대전류로 인한 발열과 내부 소자 파괴 등을 방지하기 위해 풀브리지 컨버터 모듈을 두 개의 모듈로 구성하여 SISO 풀브리지 컨버터로 설계하여 제작하였으며, 배터리는 코캄社의 리튬 폴리머 배터리(444[V], 40[Ah])를 사용하였다.
최헌종(H. Z. Choi),이석우(S. W. Lee),김기환(G. H. Kim),최영재(Y. J. Choi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
As recently optical communication industry is developed, request of optical communication part is increased. Ferrule is very important part which determines transmission efficiency and quality of information in the optical communication part. Most of ferrule processes are grinding which request high processing precision. The ultra precision centerless grinding machine for ferrule grinding was designed. The centerless grinding machine is composed of the high damping bed, grinding wheel spindle unit, regulating wheel spindle unit, feeding table and dressing unit. Reliability prediction was very important for the high quality design. In this study, centerless grinding machine was predicted reliability.