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[論文] 유리섬유 강화 플라스틱(GFRP) 절식시의 공구마멸특성(공구재종의 영향)
이원평(W.P.Lee),강명순(M.S.Kang) 한국자동차공학회 1988 오토저널 Vol.10 No.1
A turning (facing) test on Glass Fiber Reinforced Plastics was performed with several tool materials, e.g., cemented carbides, cermet and ceramic, and the wear patterns and wear rate were analyzed to clarify the relation between physical(mechanical) properties and flank wear of cutting tool. The main results are obtained as follows:<br/> (1) When cutting speed is increased, the flank wear in every tool material grows the abnormal wear in the shape of triangle at a certain speed, i.e., a critical speed.<br/> (2) When cutting speed is increased, the wear rate in experimental tool material starts to increase remarkably at a critical speed.<br/> (3) The thermal conductivity among the properties of the tool material and the thermal crack coefficient of it are almost in proportion to the critical speed.<br/> (4) The order of performance in tool materials for cutting GFRP is K 10, M 10, P 20, TiC, CB.
[論文] 유리纖維 强化 플라스틱 切削에서의 工具磨滅特性
이원평(W.P.Lee),윤종학(J.K.Yoon),강명순(M.S.Kang) 한국자동차공학회 1987 오토저널 Vol.9 No.5
This paper is a study on the effect of the cutting speed on the tool wear in turning of the glass fiber reinforced plastics.<br/> The wear behavior of cutting tool is studied by means of turning, changing the cutting speed and feed in the wide range. Moreover, the theoretical model applicable to the cutting speed of wide range is analysed.<br/> The main results obtained are as follows:<br/> The relation between the tool wear and the cutting speed is divided into three range in case of the constant cutting distance.<br/> 1) At the low cutting speed, the tool wear is independent of the cutting speed, but dependent mainly on the contact length between tool and glass fiber (1st range).<br/> 2) At the high cutting speed, the tool wear is independent of the contact length, and dependent on the cutting speed only (2nd range). The tool wear increases in proportion to the cutting speed.<br/> 3) At the higher cutting speed than the speed in the 2nd range, the tool wear is independent both of the cutting speed and the contact length (3rd range).<br/> 4) In the 3rd range, tool flank wear is constant and is observed that only the wear of cutting edge increases.
주택용 연료전지 연료전지 운전방법에 따른 계간 성능 분석
이원용(W.-Y. Lee),정귀성(K.-S. Jeong),손영준(Y.-J. Sohn),엄석기(S.-K. Um),황정태(J.-T. Hwang),김창수(C-S Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Fuel cell systems(FCSs) have potential to achieve a financial and environmental advantage over competing technologies. For use in residences and buildings FCSs can provide useful heating/hot water and electricity generation at a high overall efficiency. In this study, a 1.5Kw-class Polymer electrolyte fuel cell system(PEFCS) with a battery pack has been modelled and simulated. Its electric conversion efficiency and heat recovery performance are highly dependent on the seasonal thermal and electric load of a residence. Seasonal average fuel saving rates are calculated to find proper load management methods. The scheme can be used to determine the optimal capacity and operating strategies of PEFCS.