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이원평,김광래,이동명 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.4
In this study, to choose the drilling m/c with analysis model for dynamic design of machine tool structures, are used substructure synthesis method for reduction to degrees of freedom of dynamic model and analysis evaluation of substructures. The dynamic factors of substructures are examined by substructure synthesis method. And that dynamic design of structures for energy balancing are performed. The computer program for calculated of the dynamic and energy distribution analysis was developed. Result of numerical analysis by developed program obtained to conclusion as following. The design of machine tool structures by dynamic avoid the resonances, and are known to considered based on the energy balancing. These methods can be used effectively for the performance evaluation, design modification and improvement of dynamic performance of machine tools.
[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.
[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.
층간분리 형상계수(f_(S))가 FRMLs의 층간분리 성장률(dA_(D)/da)에 미치는 영향
송삼홍,이원평,김광래,김철웅 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
Most previous researches for the hybrid composite materials such as FRMLs (Al/AFRP, Al/GFRP) have evaluated the fatigue delamination behavior using the traditional fracture mechanism. However, most previous researches have not generally been fumed yet. Because delamination growth behavior in hybrid composite should be consider delamination growth rate, dA_(D)/da using the delamination shape factors, f_(S) instead of traditional fracture mechanic parameters. The major purpose of this study was to evaluate the relationship between delamination shape factor, f_(S) s and delamination growth rate, dA_(D)/da. And a propose parameter on the delamination aspect ratio, b/a. The details of the study are as follow : 1) Relationship between crack length, a and delamination width, b. 2) Relationship between delamination aspect ratio, b/a and delamination area rate, (A_(D))_(N)/(A_(D))_(All). 3) Variation of delamination growth rate, dA_(D)/da was attendant on delamination shape factors, f_(S1), f_(S2), f_(S3). The test results indicated the delamination growth rate depends on delamination shape factors.
강명순,이원평 대한기계학회 1988 대한기계학회논문집 Vol.12 No.5
The characteristics of tool wear and the machinability in cutting of GFRP have been studied. The wear behavior of carbide insert tools(P20, M10, K10) and Cermet in TiC grade was studied by turning of changing the cutting condition. Machinability could be estimated as the following empirical formula, CT$^{n}$ =W The main results obtained are as follows: (1) Dependence of rate of tool wear on cutting speed; with increases of cutting speed, the rate of tool wear initially increases gradually(1st range), then it increases proportionally to cutting speed(2nd range), and finally the rate is constant(3rd range). (2) When the contact length has a main, effect on tool wear, the cutting speed does nit affect the tool wear. On the contrary, the cutting speed has a main effect on tool wear, the contact length does not affect the tool wear. (3) The order of machinability is K10, M10, P20 and Cermet in TiC grade. 본 연구에서는 역학모델을 이용해 공구마멸 특성을 절삭속뿐만 아니라 공구와 유리섬유의 접촉길이에 대해서도 논하고, 이 결과와 실험결과를 대비 검토하였다. 또 몇 가지 공구재종으로 절삭성능을 측정하였다.
디스크 브레이크의 마찰면에서 발생되는 스퀼소음에 관한 실험적 연구
이해철,이원평,차경옥 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
There are various noises generated by friction. Among the rest, eliminating squeal noise generated during braking is an important task for the improvement of vehicle passengers' comfort. The parameters affecting brake squeal noise are the material properties of the braking pad, the dynamic properties of the brake parts and the dimensions of the brake assembly etc. Also, the squeal noise changes its inherent form with the normal load and sliding speed. In this study, the characteristics of brake squeal noise generated by friction is analyzed experimentally. Thе experiment focused on the analysis of friction self-excited vibration and squeal noise level. Friction self-excited vibration is caused by the dry friсtiоn between pads and rotor, and occurs as a function of their relative sliding speeds. And Friction self-excited vibration is raised the brake squeal noise.