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金亨資,全泰玉 釜山工業大學校 1994 論文集 Vol.36 No.-
Considering that the practical sliding friction is a repeated friction process of the same asperity on the same track with thin soft coatings, this paper, based on the contact model of “ball-on-disc”, established some mathematic expressions for calculating on the relation between the surface roughness of disc, kind of soft metals and frictional coefficient. The results of calculation were in good agreemtnt with experimental values. In discussions the important influence of friction coefficient of thin soft coatings on the computation results had been emphasized.
전태옥,박흥식,예규현 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2
This study was performed to investigate cutting force characteristics for the purpose of detecting tool wear by variations in cutting force. In this experiment, austempered ductile iron(ADI) is worked by a ceramic tool under finish-machining conditions. The main results obtained are as follows ; 1) In finish machining condition, the magnitude of radial force was the greatest among 3-cutting component forces. 2) The ratio of radial force to tangential force appeared constantly in spite of the variation of cutting condition and nose radius. 3) The ratio of radial force to tangential force increased linearly with respect to tool flank wear width. Thus we knew that tool flank wear is able to detect by the ratio of radial force to tangential force. 4) If tool flank wear exceed by some range, surface roughness decreased with tool flank wear.
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.
全泰玉,安贊祐 동아대학교 환경문제연구소 1987 硏究報告 Vol.10 No.1
This study is concerned with the measurement and analysis on the actual conditions of vibration and noise at the main roadside in pusan. It's results excess on level of environmental vibration and noise requisite to protect public health and welfare with an adequate margin of safety. Vibration and noise pollution affect the health of human beings and its actual condition is more and more serious by high speed of various vehicles and development of industry. It will contribute to the vibration and noise control.
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.
全泰玉,朴興植,鄭明眞,金晶坤 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2
This paper has been carried out ot clarify the behavior of the BUE experimented Aluminium with using tungsten caribide tools. The results obtained are as follow : There was the block that varied suddenly at the initial cutting force. From the point of cutting distance 150㎜ Happened the BUE and the cutting force was the normal state. As share angle is increased, compression coefficient of the chip are increased. Relation between the friction coefficient of chip side and tool rake side can make the modelization studying the BUE size. As cutting speed is increased, chip thickness is decreased.
全泰玉,朴春根 동아대학교 환경문제연구소 1981 硏究報告 Vol.5 No.1
This study has analyzed examined an experiment on the frictional wear of tool materials at high speed. The results of experiment are as follows. 1. With the increase in the frictional velocity and the contact pressure, the decrease of the frictional coefficient is influenced more by the softness of the frictional surface layer than by oxide. 2. Specific wear rate is influenced more by the frictional velocity than by the contact pressure. 3. The character of the specific wear rate and the contact pressure of each test piece is similar to one another.
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.
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.