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광학렌즈의 사출압축성형에서 오버플로우를 이용한 웰드라인과 복굴절 저감
공기환(Ki-Hwan Kong),이진효(Jin-Hyo Lee),강병욱(Byung-Ook Kang),곽태수(Tae-Soo Kwak) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
This study has focused on the weld-line and birefringence reduction of a plastic optic lens using over and CAE analysis in injection compression molding. A concave lens, which has a thin thickness in the center and a large difference in thickness between the center and the periphery, often causes weld-line defects during injection molding. CAE analysis has been applied to optimize the overflow design in order to reduce the weld-line defects and the polarization defects. To reduce the weld line and birefringence defects, overflow design and application using CAE analysis show that the measured birefringence values of the specimens before the overflow application were 46.8㎚ and 36.9㎚, and the values after the over-flow application were 13.6㎚ and 14.0㎚. From the experimental results, it is confirmed that birefringence is greatly improved when overflow is applied.