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한동철(D.C.Han),조명래(M.R.Cho),정진영(J.Y.Jung) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
This paper presents thermo-hydrodynamic behavior of circular journal bearing under the static loads. Oil film pressure is obtained by solving the Reynolds equation considering viscosity variation according to the circumferential temperature variations in the fluid film. Temperature of oil film is obtained by solving the Energy equation and heat transfer equation. Effects of oil recirculation and cavitaion are considered. Results show that the THD analysis is required to predict more accurate maximum temperature of the journal bearings driven in high speed and high load condition.<br/>
지세인(S. I. Ji),이경훈(K. H. Lee),홍리석(L. S. Hong),정진영(J. Y. Jung),김종성(J. S. Kim),김병민(B. M. Kim) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
It was investigated that plenty of the processes of shape wire drawing process designed by trial and error relying on experience of industrial experts. In consequence of this process, it is inevitable that the increase of product cost, unnecessary time consuming, and effort. In case of manufacturing the final product with asymmetric section geometry and high aspect ratio, the concentration of strain at a side caused the severe distortion of the wire and low-cycle fatigue resistance is formed. The objective of this study is to design process of multi-pass shape wire drawing from initial round material with consideration of the cross section geometry of the final product. First, the multi-pass shape wire drawing process was designed by equivalent potential line in electric field analysis. The reduction ratio of area was calculated by relationship to the number of pass in multi pass shape wire drawing process determined by capacity of drawing machine and drawing force. In order to take account of concentration of strain of cross section of wire, the process for multi shape wire drawing from initial round material to an intermediate die was redesigned using electric field analysis again. In this study, the either drawing process design was estimated by finite element simulation in which the strain distribution and standard deviation plastic strain of the cross section of drawn wire.
모듈러 형태의 재구성 가능형 마이크로 공작기계의 설계와 제작
송경근(K. G. Song),노민석(M. S. Rho),조인봉(I. B. Jo),이상기(S. K. Lee),정진영(J. Y. Jung),장성현(S. H. Jang),최영휴(Y. H. Choi) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
In this study, we designed a modular reconfigurable micro machine tool (MRmMT), which is reconfigurable from a milling machine to a lathe. Our machine tool consists of several module units; bed, column, spindle, slide units, tail stock, and controller. The reconfigurable machine tool developed in this study, demonstrated good machining abilities as a 3-axis milling machine as well as a turning lathe.