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Open AccessArticle

Influence of Heat Sink on the Mold Temperature of Gypsum Mold Used in Injection Molding

Department of Mechanical and Computer-Aided Engineering, National Formosa University, No.64, Wen-Hwa Road, Hu-Wei town Yunlin county 63208, Taiwan
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Polymers 2020, 12(3), 701; https://doi.org/10.3390/polym12030701
Received: 19 February 2020 / Revised: 17 March 2020 / Accepted: 19 March 2020 / Published: 21 March 2020
(This article belongs to the Special Issue Advances on Injection Molding of Polymers)
Gypsum molds have been developed as an alternative for the Rapid tooling (RT) method used in injection molding. However, the poor capability of the heat delivery forces the gypsum mold to operate under a high-risk condition, and distortion of the molded part becomes apparent. The goal is to investigate the effect of a heat sink on the reduction of the gypsum mold temperature and to establish a methodology for the heat sink design. The methodology used the advantage of the electrical circuit concept to analyze the mold temperature. The heat transfer of a mold was modeled using an equivalent thermal circuit. After all the components on the circuit were determined, the heat transfer rate could then be calculated. Once the heat transfer rate was known, the mold temperature could be easily analyzed. A modified thermal circuit considering transverse heat conduction was also proposed, which estimated the mold temperature more accurately. The mold temperature was reduced by 16.8 °C when a gypsum mold was installed with a 40 mm thick heat sink in a parallel configuration. Moreover, the reduction of the mold temperature improved the deflection of the molded part from 0.78 mm to 0.54 mm. This work provides a quick approach to analyze the mold temperature based on the thermal circuit concept. As the cooling system of the mold was modularized analytically, important properties of the cooling system in the heat transfer process were revealed by analyzing the thermal circuit of the mold, for example, the heat transfer rate or the mold temperature. View Full-Text
Keywords: injection molding; gypsum mold; mold temperature; heat sink; thermal circuit injection molding; gypsum mold; mold temperature; heat sink; thermal circuit
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MDPI and ACS Style

Lin, C.-C.; Chen, K.-C.; Yeh, H.-C. Influence of Heat Sink on the Mold Temperature of Gypsum Mold Used in Injection Molding. Polymers 2020, 12, 701.

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