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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.
입자 워터 젯의 이송속도가 공작물의 치수정밀도에 미치는 영향
곽재섭(Jae-Seob Kwak),하만경(Man-Kyung Ha) 한국생산제조학회 2004 한국생산제조학회지 Vol.13 No.3
Abrasive water-jet(AWJ) machining can cut various materials such as metal, glass and plastics. However, the AWJ machining has some troubles including kerf, rounding and side taper. In this study, we experimently investigated the correlation between the traverse speed of the abrasive water-jet and the dimensional error of the workpiece according to the thickness and the types of the material. The specimen was the stainless steel and the mild steel and the predetermined contour cutting was conducted. A corner radius error, an uncut width and a kerf were measured and evaluated.