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全泰玉,全彦燦,朴興植,朴永宅 동아대학교 공과대학 부설 한국자원개발연구소 1989 硏究報告 Vol.13 No.2
In this paper, results of test about machinability of the carbide tools having various tool angle on light cutting are described. The conclusion is as follows ; 1. According to the increase of cutting speed, specific cutting forces are decreased. 2. According to the increase of cutting speed and feed, chip width and chip thickness are both decreased. 3. The experimental roughness of working surface became smaller than theoretical roughness. 4. Size of burrs decreased with increase of disengage angle.
전홍구,최관순,공용해 순천향대학교 부설 산업기술연구소 1999 순천향 산업기술연구소논문집 Vol.5 No.2
GIS is evolving from a technology that addresses specific applications to a broad-based information system. Its value goes beyond increased efficiency, cost savings. Therefor GIS will be fundamental to the future on the internet. But our organizations and societies exclusively handle geographic informations in Korea. and they use independently foregin commercial GIS softwares. It makses difficult to accmulate local techniques in GIS. In order to solve this problem we implement WEB-GIS using JDBC without depening specific software.
오스테나이트系 스테인레스鋼 (STS304)의 切削性에 관한 硏究
전태옥,박흥식 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1
This study was undertaken to investigate the machinability of the austenite stainless steel(STS304) with sintered carbide tool(M40). The orthogonal cutting test was carried out under various conditions such as cutting speed, cutting depth and tool rake angle, etc. On machining STS304 steel, there is the critical cutting speed which is the saw-toothed chip according to variation of rake angle and cutting depth and which it has moved lower cutting range as the cutting speed increases. The pitch of shear zones P as well as the sliding distance D decreases with the increasing of rake angle and with the decreasing of cutting speed. The saw-toothed chip is formed at the shear strain above 1.6 to 3 in case of 0.1㎜ cutting depth and above 1.0 to 2.2 in case of 0.2㎜ cutting depth.
오스템퍼링 처리한 구상흑연주철의 절삭시 공구마멸에 관한 연구
전태옥,박흥식,예규현,서영백 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.-
This study was carried out to investigate the character ot cutting tool's wear by acoustic emission(AE) in machining austempered ductile iron(ADI). The following results have been obtained. (1) Ceramic tool among tools of P20, NC123K and ceramic had the best performance in machining ADI materials. (2) As cutting speed increased, the amplitude level of AE signal increased. (3) The In-process detection of cutting tool's wear in able to by use of AE signals. (4) In initial of cutting, surface roughness was large effect to the flank wear to some range.
전성재,조연상,김동호,박흥식 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
It is known that fractal theory has recently been used as a useful in the characterization of surface texture and the understanding of tribological phenomena such as friction, wear and lubrication. The fractal-based method for describing the rubbed surface texture has roused great interest. In this paper, the fractal descriptors was applied to rubbed surface of hydraulic driving material with image processing system in order to describe morphology of the rubbed surface. The results showed that the fractal dimension can be determined by sum of intensity difference of surface pixel. The two step size to get fractal dimension is similar to surface roughness Ra. Fractal dimensions of the rubbed surfaces increase with an increase of applied load. Morphology of the rubbed surface driving in lubricant can be effectively obtained by fractal dimensions.
전태옥,박흥식,이광영,예규현,박윤식 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
Recently the development of CNC machine tools seems to bring about progressional high speed, precision, and automation in cutting processing, but is unlikely to avoid the generation of burr arising from plastic deformation, which may result in deterioration of improvement in the precision and productivity of products. This study conducted a comparative analysis of the sizes of burrs via two-dimensional low speed cutting experiments under varied different cutting conditions by taking as its materials of cutting A6061, A2014, STS304 and SM40C commonly used for precision machine paets, motor cars, aircrafts, and so on. When the depths of burrs increase, the size of the burrs are inclined to increase linearly at their final stage rather than the lateral sizes of the burrs. When cutting becomes fast in speed, the lateral sizes of burrs appear consistent, but from a relative perspective the sizes of the final burrs tend to be remarkably increased. An increase in the angle of inclination of α is seen as effective in reducing the thickness of burrs, and burrs were more decreased in size on coating tools rather than in uncoating tools.