http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
후판 압연공정에서 상 · 하 비대칭 변형거동의 수치적 · 실험적 예측 및 설정모델에 관한 연구
변상민(Sang-Min Byon),이영석(Young-Seog Lee),전언찬(Eon-Chan Jun) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.2
The thick plate produced by rolling process is used as the basic members of a ship structure. In this paper, we present a setup model to control the asymmetric factors causing plate bending in the upper or lower direction during rolling. A series of finite element analysis are conducted to predict the relationship between various asymmetric factors and plate bending. The setup model is developed by regressing the relationship to the linear equations with several non-dimensional parameters. The setup model is verified by a pilot rolling test and applied to actual rolling conditions. Results show that the model is substantial to predict the asymmetric deformation in the plate rolling process.
경사면 가공 경로에 따른 가공 온도와 볼엔드밀 절삭력 예측에 관한 연구
이우현(Woo-Hyun Lee),조명제(Myoung-Jae Jo),전정도(Jung-Do Chun),박대균(Dea-Kyun Park),전언찬(Eon-Chan Jun) (사)한국CDE학회 2011 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2011 No.1
Recently, Cycle of the product is shortened Because of diversification of consumer needs and demands for high performance & lightweight & precision of a machine part is on the increase. Therefore, In addition to increasing mould products including 3D surfaces, The interest in ball-endmill often using finish cutting has been focused. So in this study, we consider that peak point of ball-endmill is not included on cutting at inclined plane and analysis cutting force in tool at inclined plane and check temperature on cutting.
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.
冷間壓延用 作業 롤의 Spalling 發生原因에 관한 硏究
全彦燦,全泰玉,金舜經 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2
A study on the spalling causes of work roll for cold rolling was performed in the cold rolling mill. Performance of work roll is dependent to a great extent on spalling so that both roll manufacturers and users show great interest in spalling. So this paper shows that spalling phenomena were investigated and causes determined because of more than 85% of spalling has its origin on the roll surface. As being well known, spalling mostly occurred due to developing fatigue fracture originated a crack on a roll. But such spalling can be prevented by proper roll maintenance. The spalling accidents have sharply decreased since 1981 because of the use of ultrasonic test to detect cracks on a roll.
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.
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.