It mainly studies the thermophysical properties related to heat transfer in the casting process, such as thermal conductivity and specific heat capacity, and obtains the thermophysical parameters of sodium silicate sand mold related to heat transfer process through a self-designed test device. In fact, many scholars at home and abroad have done similar experiments to calculate the thermophysical parameters of sand mold. As early as the mid-1970s, researchers such as R.D. pehlke of the University of Michigan in the United States obtained that the thermophysical parameters of molding sand are a function of temperature through experiments, and applied it to the simulation, which has greatly improved the simulation accuracy. In addition, Japanese casting experts such as kubao Gongxiong and others used pouring cast aluminum The thermophysical properties of molding sand under different conditions were measured by cast steel and cast iron.
Subsequently, many foundry scholars in China did not want to lag behind, and successively carried out experimental research on Thermophysical properties, and achieved gratifying results. For example, casting researchers such as Wang Yi of Dalian University of technology designed a set of experimental device by themselves to pour molten aluminum into a specific sand mold. Using this method, the apparent thermal conductivity of a specific sand mold was measured, and some important conclusions were obtained. For example, the apparent coefficient of molding sand has a certain relationship with the compactness of the sand mold. The closer the sand mold is, the greater the apparent thermal conductivity is, In addition, the migration of water in the sand mold will correspondingly improve the thermal conductivity of the sand mold; Professor Tu Mingwu of Huazhong University of technology and other professors also used the basic principle that the pouring method can test the thermophysical parameters related to molding sand. They also designed a specific test device by themselves, and repeated many experiments to obtain some important thermophysical parameters. They also studied and analyzed the error of the experiment. Gao Deming of Shanghai Jiaotong University and other foundry scholars considered some important factors that may exist in actual production, The sand mold temperature curve is obtained by pouring aluminum liquid, and then the thermophysical parameters of molding sand are obtained by using the inverse algorithm. These close to the actual parameters can be applied to the actual casting numerical simulation. Of course, researchers such as Yang Chen of Chongqing Institute of power engineering have established a new method to predict the thermophysical values of materials on the basis of the above, This method mainly solves these nonlinear inverse heat conduction problems by using Levenberg Marquardt iterative process to solve the physical parameters. Of course, this method has good applicability for the prediction of thermophysical properties of materials based on transient experimental method, and can be used to analyze many kinds of inverse conduction problems.