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다중 인서트 제품 사출성형 시 문제점에 대한 해석적 고찰
이정원(J. W. Lee),윤길상(G. S. Yoon),김건희(G. H. Kim),손종인(J. I. Sohn) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
In this study, the process problems and characteristics in the multi-materials inserted injection molding process were analyzed by CAE analysis method. In the inserted plastic injection molding process, inserted objects have effects on resin flow and the distribution of mold surface temperature. Therefore, the CAE analysis for investigation of molding process is needed before the fabrication of injection molds.
MR polishing에 의한 광경화성수지 성형용 글래스 몰드의 투과율 및 표면품위 향상
이정원(J. W. Lee),김동우(D. W. Kim),조명우(M. W. Cho) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In general, Light-hardening polymer was used UV nanoimprint technology. A light-hardening polymer was had the problem of poor hardness, durability. In order to overcome the problem of polymer, inter change optical glass. However glass is very manufacture and a lowering of standars transmittance. In order to glass recover was necessary polishing process. The process is magnetorheological fluids polishing. MR polishing has been developed as a new precision finishing technique to obtain a fine surface. Hence, Magnetorheological fluids has been used for micro polishing to get micro parts. This polishing process guarantees high polishing quality by controlling the fluid density electrically. The applied material in experiments is fused silica glass. Fused silica glass is widely used in the optical field because of high degree of purity. For MR polishing experiments, MR fluid was composed with DI-water, carbonyl iron and nano slurry ceria. The wheel speed and electric current were chosen as the variables of analyzing the characteristics of MR polishing process. Outstanding surface roughness of Ra=1.58nm was obtained on the fused silica glass specimen. And originally glass transmittance was recover on the fused silica glass.
실리타 코팅된 CI particle을 이용한 SUS 304의 초정밀 연마
홍광표(K. P. Hong),이정원(J. W. Lee),하석재(S. J. Ha),조용규(Y. K. Cho),이현주(H. J. Lee),조명우(M. W. Cho),최형진(H. J. Choi),제태진(T.J.Je) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Recently, the magnetorheological (MR) polishing method has been performed as a new ultra precision polishing technique for many industrial applications. This method uses MR fluids, which consists of carbonyl iron (CI) particle, carrier fluid, additives and dispersion stabilizer. However, CI particle are easily oxidized in water. This problem leads to unpredictable polishing results and reduces the life of MR fluid. To solve the problem, in this study, Silica-coated CI particles were used for MR polishing. Their rheological properties were analyzed to compare silica coated MR fluid and uncoated MR fluid. As a result, in terms of surface roughness, MR polishing with silica-coated CI based MR fluid (Ra=1.89nm) shows a better than that of uncoated CI based MR fluid.