Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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An Application of CAE in the Optimization of Runner Size in Injection Molding

사출성형에서 런너 크기의 최적화를 위한 CAE 적용

  • 김준민 (서울산업대학교 산업대학원) ;
  • 류민영 (서울산업대학교 금형설계학과)
  • Published : 2006.08.01
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Abstract

The delivery system such as sprue, runner and gate is a waste of resin in injection molding operation. In this study the reduction of runner size has been investigated using injection molding CAE softwares, Moldflow and Moldex3D, and commercial CFD Softwares, Fluent and Polyflow. To verify the computational results experiment was performed. There were three considerations in deciding optimal runner size in this study: minimum pressure at the gate that makes resin fully filled in the cavity, minimum runner size that compensates shrinkage of resin in the cavity, and frozen layer thickness formed in the runner during injection. Through the computer simulations the optimal runner size that satisfies those three considerations has been decided. Although the computational results among the softwares were slightly different, it was enough to predict the optimal runner size. The previous runner diameter was 8 mm and predicted optimal size was 5 mm. This was verified by injection molding experiment. Thus, the way of CAE application in deciding optimal runner size adapted in this study would be appropriated.

Keywords

References

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  2. Design and Analysis of Shell Runners to Improve Cooling Efficiency in Injection Molding of Subminiature Lens vol.39, pp.10, 2015, https://doi.org/10.3795/KSME-A.2015.39.10.1021
  3. Mold Technology for Precision Injection Lens vol.31, pp.7, 2014, https://doi.org/10.7736/KSPE.2014.31.7.561