Effects of different fillers on the silicone rubber mold with conformal cooling channels

Abstract

The silicone rubber mold (SRM) has large applications for the pilot runs in the mold industry because it is capable of reducing the cost and time in a new product development phase. However, the cooling performance in the cooling stage is not acceptable after the injection molding due to low thermal conductivity of this material. To improve the cooling performance, five different fillers were added into the silicone rubber (SR) to develop SRM with better cooling performance in the cooling stage after injection molding. It was found that the alcohol used to remove the polyvinyl butyral resin cooling channels is less volatile, environmentally friendly, and less harmful to the operator compared with conventional method using acetone to remove the acrylonitrile butadiene styrene cooling channels. The cooling time of the molded wax pattern can be saved by 42.7%, 53.8%, 45.7%, 50.9%, and 16.7% for SRM with 60 wt.% Al, 80 wt.% Fe, 70 wt.% Cu, 25 wt.% graphite (G), and 20 wt.% carbon black powders compared with that for SRM without any fillers. The SR filled with 20 wt.% G powder seems to be the optimal method for producing an SRM with better cooling performance based on the heat transfer coefficient, production cost, and production yield of SRM.

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Funding

The authors received financial support from the Ministry of Science and Technology of Taiwan under contract nos. MOST107-2221-E-131-018, MOST 106-2221-E-131-010, MOST 106-2221-E-131-011, and MOST 105-2221-E-131-012.

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Correspondence to Chil-Chyuan Kuo.

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Kuo, C., Chen, W., Lin, Y. et al. Effects of different fillers on the silicone rubber mold with conformal cooling channels. Int J Adv Manuf Technol 108, 1509–1525 (2020). https://doi.org/10.1007/s00170-020-05508-2

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Keywords

  • Silicone rubber mold
  • Fillers
  • Cooling time
  • Cooling performance