ZL105 aluminum alloy has low density, high strength and good casting properties. It has been applied to automobile, machine tool, aerospace and other fields. In the foundry industry, sand casting is one of the most important casting methods.
The method of predicting sand casting defects by numerical simulation technology has been widely used. However, improving the accuracy of sand casting simulation has become one of the main problems to be solved in the current research. There are many factors affecting the simulation accuracy, among which the setting of the boundary condition – the heat transfer coefficient of the solidification interface plays a decisive role in the simulation accuracy. At the same time, the heat transfer coefficient is often affected by various factors in the process of sand casting, such as space temperature, atmospheric pressure, sand casting and mold materials, initial mold temperature and interface coating, which makes it very difficult to accurately determine or solve the interface heat transfer coefficient through experiments.
At present, there are two ways to measure the heat transfer coefficient of solidification interface: directly estimating by measuring the air gap size of solidification exchange interface; According to the measured temperature of the selected point, Beck’s nonlinear inverse method or external calculation is used to solve it.
Based on Beck’s nonlinear inverse method and combined with the temperature data collected from the experiment, the interface heat transfer coefficient between sand casting and mold is solved, and then the inverse result is simulated and verified by using the heat conduction model of ProCAST software.