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MR polishing 적용을 위한 CI particle 크기에 따른 MR fluids의 유변학적 특성 분석
홍광표(K. P. Hong),이정원(J. W. Lee),하석재(S. J. Ha),조용규(Y. K. Cho),조명우(M. W. Cho),제태진(T. J. Je) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
MR (magnetorheological) fluids have been used to ultra-precision polishing optical glass and/or mold metal materials MR fluids were composed with CI particles (magnetic particle), DI water (carrier fluid), Na₂CO₃, Glycerin (stabilizer). In this study, the rheological properties of MR fluids which nano CI particles are dispersed were considered to compare the effects of micro sized CI particles, and MR polishing experiments were performed to evaluate the polishing properties of two types MR fluids. MR fluids based on two types of CI particle with different average size, 3.5㎛, 300㎚, were prepared. SEM, particle analyzer, and rheometer were utilized to investigate their rheological properties Sedimentations of MR fluids were measured to investigate the effects of dispersion stability. Finally, it was obtained the rheological properties (viscosity, shear stress, sedimentation) of MR fluid with larger particle size.
승온 경화반응속도식을 이용한 LED용 실리콘 렌즈의 유한요소해석
송민재(M. J. Song),홍석관(S. K. Hong),박정연(J. Y. Park),이정원(J. W. Lee),윤길상(G. S. Yoon) 한국소성가공학회 2014 금형가공 심포지엄 Vol.2014 No.8
Silicone is recently used for LED chip lense due to its good thermal stability and optical transmittance. In order to predict residual stress which causes optical briefringence and mechanical warpage of silicone, finite element analysis was conducted for curing process during silicone molding. For analysis of curing process, a dynamic cure kinetics model was derived based on the differential scanning calorimetry(DSC) test and applied to the material properties for finite element analysis. Finite element simulation result showed that the slow cure reduced abrupt reaction heat and it was predicted decrease of the residual stress.
Xantan gum로 코팅된 CI-particle를 이용한 MR Polishing 특성에 관한 연구
이정원(J.W.Lee),하석재(S.J.Ha),신봉철(B.C.Shin),김동우(D.W.Kim),조명우(M.W.Cho),최형진(H.J.Choi) 한국소성가공학회 2011 금형가공 심포지엄 Vol.2011 No.9
An finishing process using magnetorheological fluid (MR) fluid has been developed as a new precision finishing technique to obtain a fine metal surface. For MR polishing process, MR fluid was consists of CI particles, nonmagnetic polishing abrasives, water and stabilizers. One of the main ingredients in MR fluid is the magnetic CI particles. But carbonyl iron used in MR fluids a severe corrosion problem. Through coated on the CI particles had study the defect supplementation. It is understand the rheological behavior of the MR fluid based on the coated CI particles. Also the objectives of this research is to investigate the surface roughness obtained from the MR polishing process.