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윤을용(Eul-Yong Yun),권종완(Jong-Wan Kwon),김해원(Hae-Won Kim),김재권(Jai-Gueon Kim) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
Recently, the enterprises solve like this problem, for a cost saving the amount used minimization of the water soluble cutting oil they research. The results are applied from the enterprise. The method which minimizes the use of the water soluble cutting oil is dry processing, MQL(Minimum Quantity Lubrication) and compressed cold air use method. And, according to quality of material of the work the tool wear and surface roughness changes. Researched processing quality from this dissertation. Uses TiN coated hardmetal tool and experimented the quality of material which is various in 4 methods(Dry, MQL, -30℃ Cold air, coolant). Experimented and got the next result. The material where the cut heat is high when metalworking-oil or cold air applying, was visible the tendency where the tool wear quantity comes to be few. And, MQL of the lubricating efficiency which is excellent or coolant compared in different cooling system and was visible the tendency where the surface roughness result gets better.
權鍾完 慶北工業專門大學 1983 論文集 Vol.20 No.-
It is very important for structure analysis from the viewpoint of structurl design to know the appropriate shape of beam element. In this paper, The variational approach is formulated in two demensional isotropic plane stress problem and calculate the appropriate shape of element. An example problem, the calcuiation of thickness is showen for simple beam element under the concentrate load. In this study, following information is obtained. 1) An optimal shape condition is expressed by the term fo energy density quantity from principle of variation and example calculation coincides with the solution of uniform stress. 2) we presume the example calculation which is applied more compricate shape calculation problem.
權鍾完 慶北工業專門大學 1984 論文集 Vol.21 No.-
Stress due to circumferential V-butt welds, made with six passes in 150mm O.D., 10mm wall thickness cylindrical Cr-Mo alloy pipe, were determined by Sachs boring-out method. The effect of residual stress relief procedures upon to magnitude of stresses and distributions in weld, were investigated. 1. The axial stresses in the weld were founded to be tensile at the innersurface and compressive at the outersurface with maximum compressive stress occurring a short distance below the outersusface. 2. The effect of residual relief stresses, residual stress distributions are same but magnitude is very small by low yielding strength, analyzing time and relaxation of creep. 3. The hardness of welding line were investigated. The stress relief procedures upon to value of hardness is less then received welding. Resulting, magnitude of residual stresses in annealing pipe were founded small value.
權鍾完 慶北工業專門大學 1979 論文集 Vol.16 No.-
Wear which occurs in the slidng of metal pair is very complicated. Because it is made up the various factors which are combined in a complicated way. In this paper, the relation between wear occurs in matal pair which had been proved depend mainly on the flow pressure of material and Holm's wear equation W=KPL/?? examined by wear test of cast iron. The wear test are carried out under the dry condition using upper and lower test pieces of cast iron the same quality. We proved that material hardness dominated surface temperature induced by frictional temperature. By expressing the hardness as a function of Olad and sliding speed. Results are summarized as follows. 1) ?? could be obtained theoretically from Holm's equation, W=KPL/?? where ?? is wear rate P the load V. the sliding speed. ?? : the hardness at room temperature. C constant depending on the properties of material ?? : flow pressure. 2) The equation did not hold at high load and speed, this cause is deduced that some factors other than the hardness act predominantly on the wear process.
軟鋼과 軟鋼 및 黃銅과 黃銅間의 Slip摩耗에 關한 硏究 : 摩耗의 荷重과 距離特性을 中心으로
李濁淳,權種完 嶺南大學校 工業技術硏究所 1975 연구보고 Vol.3 No.1
Wear which occurs in the sliding of metal pair is very complicated. Because it is made up the various factors which are combined in a complicated way. So, it is very hard to formulate simple equation. In this paper, the characteristics of wear distance and wear load have been studied by using cylindrical specimen of brass and mild steel with the Suzuki type wear testing machine. Wear test carried out for brass in the lubricant condition and for mild steel at the dry condition. The results obtained were as follows: 1) In the relation between friction load and weight of wear, mild steel which tested in the dry friction reached the maximum value of wear around 20kg load on 500 rpm and 24kg load on 1000 rpm. On the other hand, for brass which carried out lubricant condition, weight of wear and wear load is proportioned. 2) In the relation between wear distance and weight of wear carried out lubricant condition, between weight of wear and wear load is proportioned. In the relation between wear distance and weight of wear, initial wear phenomenon appeared at mild steel and brass showed steady wear around 8 km wear distance. 3) At the Holm's law of wear (V=Z ), the value range of factor Z is (1.135∼4.185) ×10 and average value 2.95×10 on 500 rpm. On the other hand value range of factor Z is (2.700∼7.750)×10 and averge value 5.715×10 on 1,000 rpm.
조현덕,권종완 경일대학교 산업기술연구소 1999 産業技術硏究所 論文集 Vol.6 No.-
The accuracy achieved in machining operation depends on many factors. As the rigidity, vibration, deflection, and accuracy of machine tool improve, the machining accuracy becomes more and more dependent upon thermal expansion of all the elements in the machining system. Thus, this study shows to improve the working accuracy of numerically controlled lathe by predicting and compensating the thermal expansion of workpiece during machining, which is known to affect much on the machining accuracy. This study is separated in two parts, one is analytic solution about the thermal expansion problem of workpiece, the other is the solution about the compensation of the thermal expansion of workpiece.
SiC 粒子 强化 알루미늄 複合材料에 대한 疲勞龜裂進展 特性
권종완 경일대학교 산업기술연구소 1993 産業技術硏究所 論文集 Vol.3 No.-
본 연구는 실리콘 카바이드 입자의 강화조직인 7075-미 25%Si체를 대상으로 상온에서 피로 균열진전 대하여 Short Crack 특성과 금속조직과 상호관계를 연구하였다. 균열의 발생은 실리콘 카바이드 강화조직 입계에서 발생하였으며 그 원인은 고밀도의 강화입장화 알루미늄과 불완전한 결합에 기인한다. 균열의 진전은 K와 관련하여 응력레벨에 무관하며 금속조직의 특성의 지배를 받는다. short crack 의 발생은 long crack 의 하한계치에 비하여 낮은 k 영역에서 나타났으며 균열진전속도는 서로 유사하였다. 이것은 전자가 균열선단에서 균열의 성장은 주로 입자상호간의 금속조직적인 영향에 의하고 후자에서 일반적으로 나타나는 균열닫힘현상의 영향을 거의 받지 않기 때문이다.