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집속이온빔을 이용한 마이크로 엔드밀의 제작 및 절삭가공
김충수(Chung-Soo Kim),추원식(Won-Shik Chu),김재현(Jae-Hyun Kim),안성훈(Sung-Hoon Ahn),장동영(Dong-Young Jang),이학주(Hak-Joo Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Focused ion beam (FIB) technology has been introduced for fabricating various micro/nanoscale parts and components by providing hybrid fabrication functions, which are sputtering (destructive) and deposition (constructive). As a destructive method, the 17 ㎛ diameter micro-end mill with a four-facet was fabricated. As an initial work for smaller micro-end mill, the constructive method was applied to fabricate the micro-end mill by spraying the precursor gas of C₁₄H₁?. In order to investigate the mechanical property due to chemical composition, the constructed carbon structure for micro-end mill was characterized by EDAX and micro scale compression test. As a result, the 7 ㎛ diameter micro-end mill with a four-facet was developed. Both end mill tools were machined the workpiece (PMMA and polycarbonate), and their machining capability and feasibility were evaluated.
PEM 연료전지용 복합재 분리판의 제작비용 비교: 압축성형과 기계식 가공
이희섭(Lee, Hee-Sub),추원식(Chu, Won-Shik),강윤철(Kang, Yun-Cheol),강혁진(Kang, Hyuk-Jin),안성훈(Ahn, Sung-Hoon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
The fuel cell is one of the promising environment-friendly energy sources for the next generation. The fuel cell provides good energy efficiency above 40% without pollution or noise. Different fuel cell types are usually distinguished by the kind of electrolyte. Among these, the proton exchange membrane fuel cell (PEMFC) has advantages of high power density. low operating temperature, relatively quick start-up, and rapid response to varying loads. The bipolar plate is a major component of the PEM fuel cell stack, and it takes a large portion of stack volume, weight and cost. In this study, as alternative materials for bipolar plate of PEM fuel cells, graphite composites were fabricated by compression molding and by machining. Graphite particles mixed with epoxy resin were used as the main substance to provide electric conductivity. Flow channels were fabricated by compression molding with design of experiments (DOE) to evaluate moldability. The cost for compression molding of graphite-composite bipolar plate was compared with machining cost to make the same bipolar plate.