http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자성연마슬러리를 이용한 초미립 초경합금(WC-Co 18%)의 나노급 경면가공 특성
곽태수,Kwak, Tae-Soo 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
This study has been focused on an effective surface finishing method combining ELID (ELectrolytic In-process Dressing) and MAP (Magnetic Assisted Polishing) for the nano-precision mirror grinding of glass-lens molding mould. ELID grinding is an excellent technique for mirror grinding of various advanced metallic or nonmetallic materials. A polishing process is also required for elimination of scratches present on ELID grinded surfaces. MAP has been used as polishing method due to its high polishing efficiency and superior surface quality. It also presents some techniques for achieving the nanometer roughness of the hard material such as WC-Co, which are extensively used in precision tooling material.
곽태수,Kwak, Tae-Soo 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.1
This study has been focused on properties of mirror surface grinding technology by ELID(Electrolytic In-process Dressing) for metal matrix ceramic composites using in high precision mirror for optics. The experimental studies have been carried out to get mirror surface by grinding for composites, Al-SiC, Al-graphite and Mg-SiC. Grinding process is carried out with varying abrasive mesh type, depth of cut and feed rate using diamond wheel. The machining result of the surface roughness and condition of ground surface, have been analyzed by use of surface roughness tester and SEM measurement system. ELID grinding technology could be applied successfully for the mirror-surface manufacturing processes in spite of ductility of metal matrix material. As the results of experiments, surface roughness of Al-SiC(45 wt%) has been the most superior in these experimental work-pieces as 0.021 ${\mu}m$ Ra.
유동방향과 밀도이방성 분석을 위한 세라믹 분말사출성형 해석
곽태수,서원선,Kwak, Tae-Soo,Seo, Won-Seon 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
This study has focused on manufacturing technique of powder injection molding of watch case made from zirconia powder. A series of computer simulation process was applied to prediction of the flow pattern in the inside of the mould to clarifying the change of sintering shrinkage depended on flow direction. The material properties of melted feedstock inclusive of the PVT graph and thermal viscosity flowage properties were measured for obtaining the input data in computer simulation. Also, molding experiment was conducted and the results of experiment showed that good agreement with simulation results for flow pattern and weld line location. On the other hand, gravity and inertia effect have an influence on velocity of melt front because of high density of ceramic powder particles in powder injection molding against the polymer injection molding process. In the experiment, the position of melt front was compared with upper gate and lower gate position. The gravity and inertia effect could be confirmed in the experimental results.
곽태수(Tae-Soo Kwak),남우철(Woo-Chul Nam),김유영(Yoo-Young Kim),김경년(Kyung-Nyun Kim),이용철(Yong-chul Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
This study has been focused on properties of mirror surface grinding technology by ELID(ELectrolytic In-process Dressing) for structural ceramics using in high precision structural parts on semi conductor manufacturing processes. ELID grinding is an excellent technique for mirror grinding of various advanced metallic or nonmetallic materials as hard to machining materials. The experimental studies have been carried out to get mirror surface for grinding of structural ceramics, SiC, Al₂O₃ and AlN. Grinding process of the ceramics is carried out with varying mesh type, depth of cut and feed rate using diamond wheel. The machining result of the surface roughness and condition of ground surface, have been analyzed by use of surface roughness tester, SEM and three dimensional surface profiler measurement system.