http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이길우,김순태 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.5
The machinability of ceramics has been experimentally studied. The experiments were conducted on alumina cernmics of various purity, quartz, and cordierite using the sintered diamond tools and CBN tools. Tool wasre, surface roughness, and cutting resistence were measured and analysed. It was found that the workpieces could be machined with the diamond and CBN tools, but the sintered diamond tools were more efficient for the machining of the high strength ceramics. The machining of alumina ceramics with sintered diamond tools showed that (1) wet machining prolonged tool life comparing with dry machining, (2) workpiecewith higher purity had better surface roughness, (3) severe cutting conditions led to the chipping and fracture of tool and increase of the surface roughness and cutting resistance, (4) 20~40m/min of cutting speed, 0.01~0.02mm/rev of feed, and 0.1~0.2mm of cutting depth are suggested as proper cutting conditions for the high strength ceramics.
李吉雨 홍익대학교 산업기술연구소 1994 産業技術 Vol.3 No.-
The tool material is the most important factor in the cutting process of brittle materials. Cutting tools are subject to damages by high stress, adminish shock, and wear. Therefore, the relative hardness of toll material to the workpiece is one of the necessary conditions to keep the tool tips in shape. Also it is affected by mechanical, physical, and chemical properties of workpiece and tool material. It is the purpose of this study to find the condition for the high machinability of the lathe turning process of machinable ceramics. When superhard too K was chosen as the tool material, the machingcondition were found v=50m/min, f=0.025㎜/rev, and t=0.2㎜. Alos the optimal condition for CBn tools were found v=100m/min, f=0.025㎜/rev, and t=0.1㎜. The best surface roughness after the machining was established forthe chamber angle of -150 while other conditions were fixed. The cutting of high strength material was possible with large nose radius bite.
生産性을 考慮한 切削加工에 對한 最適切削條件의 自動選定에 關한 硏究
李吉雨,金泳祥 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-
In recent years machining turns to flexible manufacturing. Industry in machining requires to increase machining productivity and to reduce costs. To adapt this trend it is necessary to optimize machining condition Even though many researches in this are introduced various way to set the optimal condition, still there are not enough. Therefore this research was done to select the optimal cutting condition for industry, and to develope the computer program to select the optimal cutting condition automatically. Also, this program was applied to many companies, and compare costs per minute. The results of this research will contribute to increase machining productivity of various companies with the automatic selection of optimal cutting condition.
기관평가제도 운영의 영향요인에 관한 연구과학기술계 정부출연연구기관을 중심으로
이길우 한국기술혁신학회 2005 기술혁신학회지 Vol.8 No.S
The purpose of this paper is to seek out the problems influencing on the operation of Institution Evaluation(IE) in Korea and suggest a better way for the evaluation based on the findings, expecially focusing on Government Research Institute(GRIs) in the field of Science and Technology. Unlike previous studies on IE of GRIs, this research is more oriented toward actual practices than design and theories of IE. Three categories are 1) purely system aspect, 2) system-operation aspect, and 3) environmental aspect. These three categories are classified into eight subcategories: 1) the legal support and the legally enforceable provision, 2) the target area of evaluation, 3) the means and process of evaluation, 4) the criteria and indices for evaluation, 5) the expertise of evaluators, 6) the use of evaluation findings, 7) GRIs' support for IE, and 8) public support for IE. Summing up the findings of this study, the main factors that hamper the successful operation of the existing IE of GRIs in the field of Science and Technology was illuminated and the better way for the operation of IE was suggested.