Simplified inverse heat conduction method for interfacial heat transfer coefficient of casting process based on simulated feedback

Abstract

Currently, there are many methods for solving the interface heat transfer coefficient, but the classical solution method requires high precision of casting temperature points, needing precise temperature measurements at multiple points on the casting and mold. For complex processes and special pouring environments, achieving stable casting is often difficult. This paper proposes an interfacial heat transfer coefficient solution method based on the secant method and numerical simulation platform. By adjusting the interface heat transfer coefficient, the solidification process of the casting is calculated and a feedback model of the temperature curve is established. A secant method is designed to correct the interface heat transfer coefficient, ensuring accurate fitting of the simulated temperature curve to the target curve, thereby achieving accurate determination of the interface heat transfer coefficient. This method avoids the difficulty of temperature measurement in complex processes and special pouring environments, requiring only the temperature curve of a single point. By comparing assumed interface heat transfer coefficients with the calculation results, it is shown that this method can accurately fit the temperature field, less than 0.1% of the average error in the temperature field and less than 1% of the average error in the interfacial heat transfer coefficient, demonstrating the reliability of the method. Based on the actual temperature measurement results, the curve of titanium alloy investment casting obtained. The final temperature curve fitting accuracy reaches 0.1%, matching well with the actual results, yielding the curve of the interface heat transfer coefficient variation with temperature for TA15 investment casting.