http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
하이브리드 외부가압 공기베어링에서 노즐 위치에 따른 부하지지력 특성
이득우,이종렬,황성철,이준석 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
Externally pressurized air journal bearing has been widely used in high-speed spindle system and precision machinery because of its characteristics such as substantially low frictional loss, low heat generation and averaging effect leading better running accuracy. But air journal bearing have a disadvantage of the low load capacity due to the low viscosity. In this paper. The air journal bearing design to overcome the defects of air bearing such as low stiffness and dimping coefficients was investigated theoretically.
이득우,Lee, Deuk-U 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.7
In this paper, the measurement technique of cutting temperatures of shear zone using implanted thermocouples is proposed in ball end milling. K-type thermocouple implanted in the hole of workpieces is directly cut in order to measure temperatures of the shear zone in cutting process. Experiments are performed for a nickel based superalloy(Inconel 718) using a ball nose end mill. The results show that the cutting temperature in shear zone is about 3200C at the cutting speed of 90m/min with dry.
Toms 효과가 있는 저어널베어링에서의 $K-\epsilon$ 모델을 이용한 성능해석
이득우,김경웅 대한기계학회 1986 대한기계학회논문집 Vol.10 No.4
본 연구에서는 K-.epsilon. 모델을 사용하여 마찰감소 현상이 있는 저어널베어링 내 의 흐름을 해석하였다.
$(Mg_{0.93}Ca_{0.07})TiO_3$ 세라믹스의 소결 및 마이크로파 유전특성에 미치는 $B_2O_3$의 영향
이득우,박재환,김인태,박재관,김윤호,최덕균 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.3
The effects of B2O3 addition on the sintering behavior and th microwave dielectric properties of $(Mg_{0.93}Ca_{0.07})TiO_3$ ceramics were investigated. By addition of $B_2O_3$, increases the density of the ceramics increases and grain growth enhances, It was densified to over 94% of $(Mg_{0.93}Ca_{0.07})TiO_3$ theoretical density by the addition of 0.15-1.0wt% B2O3 and stable microwave dielectric properties observed by the addition of 0.2-0.4wt% $B_2O_3.\;(Mg_{0.93}Ca_{0.07})TiO_3$ ceramics sintered at $1200^{\circ}C$ exhibits maximum dielectric constants of 24-25 quality factor($Q{\times}f$) of more than 70000 and temperature coefficient of resonant frequency of $0\;ppm/^{\circ}C$ by adding of 0.15-0.4wt% $B_2O_3$.
니켈계 합금의 볼엔드밀 가공에서 절삭 방향에 따른 영향
이득우,Lee, Deuk-U 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.10
High speed ball end milling is attracting interest in the aerospace industry for the machining of complex 31) airfoil surfaces in nickel based superalloys, Experimental work is detailed on the effect of cutter orientation on tool life, cutting forces, chip formation, specific force and workpiece surface roughness, when high speed ball end milling nickel based supperalloy(lnconel 718). Dry cutting was performed using 8min diameter solid carbide cutters coated with either TiA1N or CrN for the workpiece mounted at an angle of 45˚ from the cutter axis. A horizontal downwards cutting orientation provided the best tool life with cut lengths~50% longer than for all other directions. Evaluation of cutting forces and associated spectrum analysis of results indicated that cutters employed in a horizontal downwards direction produced the least vibration.