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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.
工具刃先의 損傷에 미치는 構成刀先의 生成 및 脫落擧動에 관한 硏究
전태옥,박흥식 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2
This study was attempted to investigate the effect of the behaviour of built-up edge on tool failure of high speed steel (SKH55) cutting with SS41. The cutting test was carried out with various experimental conditions. The specific cutting force K_(c) and K_(t) (the vertical and radial cutting force) had small values owing to the enlargement of the rake angle below 40m/min of the cutting velocity. The enlargement of the built-up edge affected directly the crater ratio C. The crater wear in the neighbourhood of cutting tool had nothing to do with cutting time and flaten region which had 4㎛ of depth and 0.4㎜ of width was in existence. The micro-hardness distribution in the deepest part of crater was not affected by nearly the cutting time. Through this cutting experiment it is appeared 4 kinds of tool failure according to behavior of the built-up edge in combination of cutting speed and feed.
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.
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.
全彦燦,芮圭玄,朴興植,全泰玉 東亞大學校 1989 東亞論叢 Vol.26 No.1
The present study was undertaken to investigate the otheogonal cutting mechanism of pure aluminum with sintered carbide tools, such as the cutting resistance, shear angle and work, the formation of chip and the instantaneous aspect for cutting process. The results obtained are as follows: 1. In case of negative tool rake angle, the decrease rate of cutting resistance was progressed till high speed cutting. 2. When the cutting depth is small, the shear angle of cutting part depends on the influence of size effect. 3. The formation of chip is classified into shear type, vertical compression type, horizontal compression type and flow type. 4. The measurement of the built-up edge was able to obtain decreased by the geometric expression of the instantaneous aspect for cutting process.
전태옥,전언찬,박흥식,배춘익 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2
Temperature distribution on the flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junction imbedded in a cutting tool. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on flank face of cutting tool Flank wear were observed by the tool microscope. The analytical results show that the temperature on the top flank face of a tool is higher because of the difference of the friction velocity on each face of the tool.