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박순섭(Soon-Sub Park),이기용(Ki-Yong Lee),김형모(Hyoung-Mo Kim),황연(Yeon Hwang) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
For the machining of freeform surface, fly cutting is one of the key technology to meet profile accuracy and surface roughness simultaneously. Fly cutting can be applied to manufacturing of optical components with complex profile. In this study aluminum alloy was machined in the process of ultra precision fly cutting and investigated optimum machining conditions in terms of feed-rate, pitch per cycle and depth of cut.
박순섭(Soon-Sub Park),이기용(Ki-Young Lee),김형모(Hyoung-Mo Kim),이재설(Jae-Seol Lee) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.3
Three methods for grinding: cross grinding, slanted tool axis grinding and parallel grinding, were carried out to study the machinability of tungsten carbide mold for glass formed aspherics lens. In our research, the optimum grinding conditions were investigated in terms of feed-rate, relative velocity of wheel and work piece, tool marks and surface roughness. It is shown that cross grinding are most effective in removal ratio but poor in surface roughness. In addition, tool marks of each method were differentiated on direction and shape.
유리렌즈 성형용 초경합금의 Pt 박막의 특성에 관한 연구
박순섭(Soon-Sub Park),이기용(Ki-Yung Lee),원종호(Jong-Ho Won) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.3
Pt thin films on Cr or Ti interlayer were deposited onto a tungsten carbide(WC) substrate by the ion beam assisted DC magnetron sputtering. The various atomic percent of Cr and Ti underneath of the Pt films were prepared to examine the total thin film characteristics. The microstructure and surface analysis of the specimen were conducted by using the SEM, XRD and AFM. Mechanical properties such as hardness and adhesion strength of Pt thin film also were examined. The interlayer of pure Ti was formed with 40 nm thickness while that of pure Cr was done with 50 nm as standard reference. The growth rate of either Cr or Ti thin film was almost same under the same deposition conditions. The SEM images showed that anisotropic grain of Pt thin films consisting of dense columnar structures irrespectively grew from the different target compositions. The values of hardness and adhesion strength of Cr/Pt thin film coated on a WC substrate were higher than those of Ti/Pt thin film.
박순섭(Soon-Sub Park),원종호(Jong-Ho Won) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.3
This paper presents a geometrical error compensation of tool alignment for sharp edge bite on B axis controlled machine. In precision micro patterning, bite alignment is crucial parameter for machined surface. To decrease bite alignment error, plus tilted bite from B axis center is touched to reference work piece(pin gauge) and checked the deviation from original position. Same process is repeated for maximum touch deviation value. From this touched position value, wheel alignment error in X axis and Z axis can be calculated on B axis center. Experimental results show that this compensation method is efficient to correct sharp edge bite alignment.