Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
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A study on CAE and injection molding of automotive thick-walled light guide with micro-optical patterns

마이크로 광학 패턴이 있는 차량용 후육 라이트 가이드의 CAE 및 사출성형에 관한 기초연구

  • Dong-Won Lee (Korea Institute of Industrial Technology, Research Institute of Advanced manufacturing & materials Technology) ;
  • Jong-Su Kim (Korea Institute of Industrial Technology, Research Institute of Advanced manufacturing & materials Technology) ;
  • Hyeon-Hwa Lee (Korea Institute of Industrial Technology, Research Institute of Advanced manufacturing & materials Technology) ;
  • Sung-Hee Lee (Korea Institute of Industrial Technology, Research Institute of Advanced manufacturing & materials Technology)
  • 이동원 (한국생산기술연구원 뿌리기술연구소) ;
  • 김종수 (한국생산기술연구원 뿌리기술연구소) ;
  • 이현화 (한국생산기술연구원 뿌리기술연구소) ;
  • 이성희 (한국생산기술연구원 뿌리기술연구소)
  • Received : 2023.09.20
  • Accepted : 2023.09.30
  • Published : 2023.09.30
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Abstract

In this study, basic research was conducted on manufacturing technology of thick-walled light guide a component that controls the light source of automobile lamps. As a preliminary study for manufacturing the final injection molded parts, a model for analyzing the influence of micro patterns on light guides is presented. The optical characteristics of the light guide were analyzed according to the change of the curvature radius of the micro-optical pattern, and the injection molding characteristics of the light guide according to the change of injection molding conditions were analytically evaluated. It was confirmed that the luminance uniformity improves as the R value decreases for changes in the micro-pattern R value, but it was confirmed that there are technical limitations in actual injection mold core processing and high-replication injection molding. Injection molding analysis showed that cooling channel design is very important compared to general injection molding due to thick-wall characteristics and thickness variation. It was also confirmed that the cooling channel has a great influence on the cycle time and birefringence result due to residual stress. As a result of analyzing the influence of filling time, holding condition, and cooling on shrinkage, it was found that the cooling water temperature has a significant effect on the shrinkage of ultra-fine light guide parts, and the holding condition also has a significant effect.

Keywords

Acknowledgement

본 연구는 한국생산기술연구원 및 산업통상자원부의 소재부품산업기술개발기반구축사업의 글로벌 '시장진출을 위한 차세대 자동차용 R100㎛, Ra20nm급 디지털 라이트닝 초미세 Light Guide 모듈 금형성형기술 개발(KM230100, 20019131)'과제의 지원을 받아 수행되었다.

References

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