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FDM에서 곡면부의 접선기울기가 제품의 표면에 미치는 영향
하만경,전재억,Ha, Man-Kyung,Jun, Jae-Uhk 한국기계가공학회 2002 한국기계가공학회지 Vol.1 No.1
Fused deposition modelling(FDM) is a rapid prototyping(RP) process that fabricates part layer by layer by deposition of molte thermoplastic material extrude from a nozzle. RP system has benefits. Benefit would be the ability to experiment with physical objects of any complexity m a relatively short period of time. But it has a matter of surface roughness and geometric accuracy. We study on Influence of tangent line angle on surface roughness at fused deposition.
하만경(Man-Kyung Ha),김상오(Sang-Oh Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The grinding process is dissimilar to other conventional machining methods such as turning and milling. The difference between them is due to not only the cutting edges of the grinding wheel don’t have the uniformity but also the edges act differently on the workpiece at each grinding. In spite of many researches during past decades, describing the grinding action between the grinding wheel and the workpiece was not made clearly. So statistical models and computer simulations that could overcome the variety of the cutting edges were introduced. These complexities and difficulties of illustrating the grinding process also raised an obstacle to the optimization of the grinding process and to the verification of the interrelationship between the grinding parameter and the obtained grinding result. In present paper, the finest grinding wheel for textile industry was developed by using the response surface method, genetic algorithm and Taguchi method to predict surface roughness and wear of the grinding wheel.
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.
정진서,전재억,한규상,서상하,하만경,Jung, Jin-Seo,Jun, Jae-Uhk,Han, Gu-Sang,Seo, Sang-Ha,Ha, Man-Kyung 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.1
In any rapid prototyping process, the layer by layer building process introduces an area error between the staircase and the surface line specified by the computer-aided design model. This affects the dimensional accuracy as well as the surface finish for different Road Widths. This paper describes a methodology for computing the area error for any Road Width by the fused deposition modelling system. This technique can be applied to determine the best Road Width of the part, based on the minimum area error. This technique is verified by comparing the results with the experimental measurements of the area error with Road Widths.