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원종호 忠南大學校 産業技術硏究所 1989 산업기술연구논문집 Vol.4 No.1
With the increasing demand of high efficient machining, the high speed grinding is a new trend of machining process. In a short time we can increse metal removal rate with high speed grinding. But it is necessary to examine the effect of machining. The purpose of this study is to research the grinding temperature, grinding force and machined surface roughness when we grind steel with high speed.
元鍾虎 충남대학교 공업교육연구소 1985 論文集 Vol.8 No.2
The characteristics of surface will be well explained by method of statistics. This method is very powerful tool for analyzing grinding wheel characteristics. The simulational analysis of summit distribution and slop distribution of surface were carried out by using a personal computer. From this study, following result are obtained : (1) The characteristic of surface geometry can be more specifically represented by statistical analyzing method. (2) The signal of surface roughness tester can be directly analyzed by personal computer. (3) The simulational analyzing method is very useful to represent surface geometries of grinding wheel.
元鍾虎 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.2
The influence of grinding fluid on grinding characteristics was investigated when the SM20C steel was ground with CBN wheel. Experiment were carried out for dry grinding and wet grinding with light-oil and water soluble oil. The main result obtained are as follows, 1. Grinding temperature of workpiece was increased with increasing wheel speed at low speed zone for dry, light-oil and water soluble oil but it was decreased with increasing wheel speed at high speed zone. 2. Grinding temperature is lower in the order of dry, light-oil and water soluble oil. 3. At the low feed speed tangential and normal grinding force are lower when lubricated with water soluble oil as light-oil, but at the high feed speed they are reversed. 4. Grinding surface roughness are better as in the oder of dry, light-oil and water soluble oil.
원종호,제갈범,하영철 한국풍공학회 2010 한국풍공학회지 Vol.14 No.2
이 연구는 풍동실험을 통하여 건축물의 외장재에 작용하는 풍압을 측정하여 피크팩터와 피크외압계수의 특성을 규명한 것이다. 각각의 풍압공에서 측정된 풍압시계열 데이터로부터 산정된 피크외압계수와 정상확률과정에서 얻은 피크팩터를 이용한 피크외압계수를 비교하였다. 풍동실험은 금오공과대학교 소재 토출식 경계층 풍동에서 실시하였다. 본 연구를 위하여 실험모형은 변장비를 1로 고정시키고 형상비를 2, 4, 6으로 변화시킨 3개의 모형을 대상으로 실험을 실시하였다. This study aims to compare characteristics of peak factor and peak external pressure coefficient on cladding of buildings. Peak external pressure coefficients were calculated from time-series data of wind pressure measured in each of wind pressure tab and peak external pressure coefficients calculated using peak factors gained in stationary process were compared. Wind tunnel tests were conducted on open-type boundary layer wind tunnel located in Kum-oh National Institute of Technology. Side ratio of test models was fixed as 1 and aspect ratios were changed as 2, 4 and 6 respectively.
圓筒硏削에서의 溫度 및 硏削力 測定시스템 開發에 관한 硏究
元鍾虎 충남대학교 공업교육연구소 1987 論文集 Vol.10 No.1
The purpose of this study is to develop the temperature and force measurement system in cylindrical grinding process. The main result are as follows; 1) The reusable workpiece temperature measuring apparatus for cylindrical ginding is developed. 2) This temperature measuring apparatus is no need calibration and easy to measure a metal removal rate. 3) The force measuring apparatus of cylindrical grinding is made with use of strain gage. 4) Data acquisition system is constructed in use of personal computer.
摩擦加工材料의 性質과 摩擦加工 表面 거칠기와의 關係에 關한 硏究
元鍾虎 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.2
Aluminum bass and carbon steel were found to be friction-worked by tungsten carbide tip in this experiment. Their minimum surface roughnesses, optimum contacts loads and constants of surface roughness were compared with their mechanical and chemical properties. Main results were obtained as follows. 1) The optimum sliding speed for obtaining minimum surface roughness of Aluminum is 40-50m/min and that of brass is under 90m/min, and that of carbon steel is 40-90m/min, the constants of surface roughness reach the maximum values between the range of 30 of to 70m/min for all three materials when they are friction with tungsten carbide tip. 2) Minimum surface roughness of carbon steel gets a small value in the following order (1) no lubricating at all (2) diesel oil lubricating (3) machine oil lubricating when the sliding speed is under 100m/min. 3) Minimum surface roughness of carbon steel is 0.023μRa, and that of brass is not as good as carbon steel at 0.062μRa with a surface roughness of 0.12μRa before testing and that of aluminum is good at 0.047μRa with a surface roughness of 0.5μRa before testing when they are friction-worked with lubricating of machine oil. 4) The optimum contact load of carbon steel increases as the sliding speed increases with oil lubricating, then the value of machine oil lubricating is lower than the value of diesel oil lubricating and the value decreases as sliding speed increases with lubricating. 5) The optimum contact load of aluminum has a minimum value and that of Brass has a maximum value in the range of sliding speed between 60 and 70m/min.