고속도강공구의 플랭크면 절삭온도 예측에 관한 연구

전태옥,배춘익 한국마린엔지니어링학회 1995 한국마린엔지니어링학회지 Vol.19 No.1

Temperature distribution on 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 of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on flank face of cutting tool with high speed steel. 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.

超硬合金 Gun drill에 의한 CNC 深孔加工 特性에 관한 硏究

全泰玉,沈成輔 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

The techiques of gundrilling and gun boring began developing in the late 18th century with the need for more accurate bores in rifle and cannon. Gun drilling developed first for correcting errors in long holes and was later modified to bore through solid stock. Gun drilling is performed with the rotating drill and stationary workpiece in this study. The work material is SM45C carbon steel. Empirical data thave been obtained for work materials SM45C under pepresentative drilling conditions. The several features of gun drilling are obtained in this study.

조절압연용 작업롤의 방전조도가공 특성에 과한 연구

전언찬,김순경,전태옥 東亞大學校 大學院 1995 大學院論文集 Vol.20 No.-

The results were obtained with changes according to the surface roughness of work roll and method to make the peak count on the roll in the temper rolling, and factors to affect the work roll surface in actual roiling machine (ie. Temper mill). Conclusions are as follows. 1. E.D.T(Electro-discharge texturing) roll provide more uniform roughness distribution than the shot blasted roll, and it's life time is two times longer than that of shot blasted because it has more sine wave roughness. 2. The higher the peak count of surface roughness, the more time is necessary to work roll texture in shot blasting method, surface roughness is relating to the grit size, impeller speed and hardness of roll material, But it can not control the peak count. 3. In shot blast texturing, Surface roughness of temper rolled strip which is transferred surface roughness of work roll is more than that of E.D.T roll. 4. E.D.T roll has more uniform than the shot blasted roll and has more peak count than that of shot blasted roll. The surface of painted strip to image clarity is superior to that of shot blasted roll because E.D.T roll has more peak count and smooth surface.

摩擦係數에 미치는 摩擦面 表層軟化의 影響에 관한 硏究 : 高分子 材料의 경우 Friction and Wear Characteristics of Thermoplastic Polymers

全泰玉,全彦燦,朴興植 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.2

For the study, thermoplastic rigid polyvinyl chloride, which has been widely used for the parts of machine, has been applied as high polymetric materials and has been investigated into relationship between circumferential surface and steel sphere in order to clear the characteristics of the softened surface layer with frictional velocity, contact load and feed. The results obtained are as follows. 1. In constant frictional velocity, as the contact load was increased by degree the coefficients of friction was slowly decreased and it has inclination of increasing by softness on the surface layer according as the contact load was increased. 2. In constant contact load, as the frictional velocity was increased by 63m/min the coefficients of friction was slowly decreased, and in more than, the coefficients of friction was rapidly decreased by a lubricating effect of the frictional surface layer. 3. The fusional trace on the harden polyvinyl chloride was appeared by the frictional force with it according as the frictional velocity and the contact load were become high, especially appeared the deep ones with softening on the frictional surface. 4. Under condition of feeding, the coefficients of friction of a new surface was high in higher than 503m/min of the frictional velocity, but low in lower than the value comparing with repeated friction.

純알루미늄의 二次元切削 機構에 관한 硏究

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.

硬質鹽化 비닐 樹脂의 切削特性

全泰玉,鄭明眞 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.1

This study has been carried out to clear chip shape, chip formation and cutting mechanism of thermoplastic rigid polyvinyl chloride with low speed orthogonal cutting. The results obtained are as follows; 1. The chip shapes are classified flow type chip and shear type chip, they are became flow type as tool rake angle increases, according as cutting depth and cutting speed decreases. 2. The shear pitch zone of shear type chip is approached cutting depth. 3. The size effect is existed such as the metal cutting. 4. The friction coefficient decreases by increasing cutting depth, and it increases by increasing tool rake angle. 5. The experimental points are approached to some degree Ernst-Merchant's cutting equation, but the cutting equation of the given condition is obtained 1,47φ+β-α =2/5π.

高分子材料의 高速切削에 관한 硏究

全泰玉 동아대학교 공과대학 부설 한국자원개발연구소 1983 硏究報告 Vol.7 No.1

The experimental study was carried out to clear the cutting properties of plastics in high speed turning with using a cutting tool made of high speed steel. The obtained results through this experimental study are followings 1) In orthogonal cutting, the vertical compoment of cutting force is a little in creased to about 500m/min of cutting velocity, but it is decreased in high speed for the influence of chips. 2) In orthogonal cutting, chips are become from flow type to shear and tear and when the chip is flow type, the surface roughness is good. 3) In oblique cutting, according to increase of cutting velosity, the tool in weared more severe and each component of cutting force is increased simultaneously. 4) In oblique cutting, the weared width of side rake face is generally equal to the cutting depth and cutting velocity is more high, the width of front edge is more weared and the length of flank is more increased.

초듀랄류민(A2024-T3)의 절삭거동에 관한 연구

전태옥,박흥식,예규현,Jun, Tae-Ok,Park, Heung-Sik,Ye, Guoo-Hyeon 한국정밀공학회 1992 한국정밀공학회지 Vol. No.

This study was undertaken to investigate the cutting behaviour of super duralumin (A2024-T3) with sintered carbide tool(P20). The cutting test was carried out under different conditions such as cutting speed, cutting depth and rake angle, etc. The specific cutting force Kc and Kt of vertical and radial forces decreases as cutting speed increases, especially the decrease rate of Kt becomes larger than of Kc as cutting speed increases. Kc and Kt in small cutting depth are much affected by work-hardening of surface layer. The chip width and shear angle become layer as cutting depth increases, especially chip width at feed of 0.1mm almost approaches cutting width. Relation between the friction coefficient of chip side and tool rake angle side can make the modelization studying the built-up edge size. The shear angle model equation of super duralumin generally agree with theory of Ernst-Merchant.

순도를 달리한 알루미나 세라믹스의 마멸과정 및 이의 기구에 관한 연구

전태옥,진동규 대한기계학회 1994 대한기계학회논문집 Vol.18 No.12

The present study was undertaken to investigate the dry wear process and wear mechanism of the alumina ceramics in the purity variation which are used for the mechanical seal, roll, liner and dies. The wear test was carried out under different experimental condition using the wear testing device and in which the annular surface rubbed on dry sliding condition various sliding speed, contact pressure and sliding distance. In case of alumina purity 95%, there was speed range which wear loss increased rapidly owing to enlargement of heat impact force and temperature rise of wear surface. According as the alumina purity increased, wear loss decreased but alumina purity 85% with much void and defect had the most wear loss than any other alumina purity. The friction coefficient of sliding initial stage of wear curves has a large value but according to increase of sliding distance, it decreased owing to drop of the shear strength of wear surfaces.

냉간성형용 Die 강의 미끄럼 마멸특성에 관한 연구 ( A Study on the Sliding Wear Characteristics of the Die Steel for the Cold Molding )

전태옥,박흥식,류경곤 한국트라이볼로지학회 1993 한국윤활학회지(윤활학회지) Vol.9 No.1