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Center-gated 디스크에 대한 사출/압축 성형공정의 수치적 모델링-압축성을 고려한 점탄성유체 모델의 사출성형-
김일환,박성진,정성택,권태현,Kim, Ilhwan,Park, Seong-Jin,Chung, Seong-Taek,Kwon, Tai-Hun 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.2
The present study attempted to numerically simulate the process in detail by developing an appropriate physical modeling and the corresponding numerical analysis for precision injection and injection/compression molding process of center-gated disk. In part I, a physical modeling and associated numerical analysis of injection molding with a compressible viscoelastic fluid model are presented. In the distribution of birefringence, the packing procedure results in the inner peaks in addition to the outer peaks near the mold surface, and values of the inner peaks increase with the packing time. Also, values of the density in the core region increase with the packing time. From the numerical results, we also found that birefringence becomes smaller as the melt temperature gets higher and that it is insignificantly affected by the flow rate and the mold temperature. As far as the density distribution is concerned, mold temperature affected the distribution of density especially near the wall. But it was not significantly affected by flow rate and melt temperature. Numerical results of birefringence coincided with experimental data qualitatively but didn't quantitatively.
변형 LIGA 공정을 통해 구현된 microlens 의 모델링 및 시뮬레이션
김동성(Dong Sung Kim),이성근(Sung-Keun Lee),양상식(Sang Sik Yang),권태현(Tai Hun Kwon),이승섭(Seung S. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In this paper, we present a prediction model for microlens formation by means of a deep X-ray lithography<br/> followed by a thermal treatment of a PMMA (Polymethyl-methacrylate) sheet. According to this modeling, Xray<br/> irradiation causes the decrease of molecular weight of PMMA, which in turn decreases the glass transition<br/> temperature and consequently causes a net volume increase during the thermal cycle resulting in a swollen<br/> microlens. Both a simple analysis and a Finite Element Analysis based on this model are found to be able to<br/> predict the variation pattern of the maximum heights of microlens which depends on the thermal treatment.<br/> The prediction model could be applied to optimization of microlens fabrication process and to designing a<br/> micro mold insert for micromolding processes.