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<p>Accurate determination of the interface temperature between molten metal and the ceramic shell is essential in investment casting for controlling solidification and ensuring dimensional accuracy. Direct measurement is difficult due to transient heat flow and the multilayer shell structure. This study presents a mathematical model that predicts interface temperature as a function of shell mold thickness and insulation asbestos thickness, providing a practical tool for optimizing process parameters and improving casting quality. To verify the reliability of the proposed model, simulation validation was conducted using two professional numerical simulation software, COMSOL and ProCast. By comparing the simulation results with the predicted results of the model, the interface temperature difference is less than 20&#xa0;°C. This result confirms the rationality of the model. This research finding indicates that increasing the thickness of the insulation asbestos enhances both the thermal resistance and total heat dissipation resistance of the shell, with a concomitant rise in the interface temperature. An increase in shell thickness induces a reduction in the interface temperature, which serves to constrain the grain size at the thin-walled position within the range of 0.7–1.3&#xa0;mm<sup>2</sup>.</p>

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A Novel Coupled Model for Interface Temperature Prediction in Investment Casting with Considering the Variation of Shell Mold and Insulation Asbestos Thickness

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Shu Wang,
  • Shi Cheng,
  • Ruirun Chen,
  • Zhaohui Hu,
  • Peng Zhang,
  • Hongze Fang,
  • Qiuju Zhu,
  • Haitao Liu,
  • Xiaoming Wang,
  • Yalong Gao,
  • Jingjie Guo

摘要

Accurate determination of the interface temperature between molten metal and the ceramic shell is essential in investment casting for controlling solidification and ensuring dimensional accuracy. Direct measurement is difficult due to transient heat flow and the multilayer shell structure. This study presents a mathematical model that predicts interface temperature as a function of shell mold thickness and insulation asbestos thickness, providing a practical tool for optimizing process parameters and improving casting quality. To verify the reliability of the proposed model, simulation validation was conducted using two professional numerical simulation software, COMSOL and ProCast. By comparing the simulation results with the predicted results of the model, the interface temperature difference is less than 20 °C. This result confirms the rationality of the model. This research finding indicates that increasing the thickness of the insulation asbestos enhances both the thermal resistance and total heat dissipation resistance of the shell, with a concomitant rise in the interface temperature. An increase in shell thickness induces a reduction in the interface temperature, which serves to constrain the grain size at the thin-walled position within the range of 0.7–1.3 mm2.