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허광태(Kwang-Tae Hur),박후명(Hoo-Myung Park),곽재섭(Jae-Seob Kwak),하만경(Man-Kyung Ha),하경호(Kyoung-Ho Ha) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Recently, polyurethane pre-polymer has been used widely in the social life. In this paper, evaluation of parameters for polymerization process was carried out using design of experiments. As a result, the effect of each parameter affected by viscosity and residual NCO of pre-polymer was found. Optimization of polymerization process was performed. and the these results were applied to produce casting tape having a better performance.
허광태(Kwang-Tae Hur),하만경(Man-Kyung Ha),이용철(Yong-Chul Lee) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
The cemented carbide alloy is used in many fields, such as cutting tool and mold. In this study, the ultra-precision machine carried out nano-grinding for cemented carbide surface. The grinding machine was super-precision machine with air bearing spindle. During the grinding process, #600 diamond wheel was used first for rough grinding and then, #2000 diamond wheel for fine grinding. The result of surface roughness was 5.371nm in this study, which was better than usual mold surface roughness.
허광태(Kwang-Tae Hur),하만경(Man-Kyung Ha) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
This study about pre-polymerization for production of casting tape has been carried out to find good chemical composition. But, actually, different applied to pre-polymerization. So, it is necessary to perform the optimization of parameters for pre-polymerization. So, this study carried out the total of twenty-seven experiment to check the influence of the all factors. Such as water temperature of heating polymerization furnace, working time in the peak of condition, impeller rotating speed, impeller shape. And then, the result showed that impeller shape have heavily affected the NCO, and also water temperature have fairly affected the residual NCO. moreover, the prepolymer experiment took total reaction to maintain over one hear according to water and thermometry experiment of pre-polymer checked value.
허광태(Kwang-Tae Hur),하만경(Man-Kyung Ha),곽재섭(Jae-Seob Kwak),이용철(Yong-Chul Lee) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
It is absolutely necessary to achieve precision manufacturing technology of lenses because their usage for camera, medical instruments, optical parts and so on is gradually increasing. This study focused on the assessment of grinding process of the mold core for spheric lenses. For the experiments, a nano-turning machine was adopted and a used material for the mold core was a tungsten carbide including the cobalt composition of below the 0.5%. According to preplanned experimental process, a diamond grinding wheel was trued and dressed by a GC wheel, and then the mold cores were ground as R30. The form accuracy and the surface roughness of the mold core after grinding process were measured.