China has also carried out numerical simulation research on solidification of sand castings since 1978. Although it started relatively late, it has developed rapidly. Firstly, many colleges and universities and professional scientific research institutes have carried out a large number of basic research on Numerical Simulation of solidification process of sand castings Representative institutions in this regard include Dalian University of technology, Northwest University of technology, Shenyang Foundry Research Institute, Harbin Institute of technology, Xi’an Jiaotong University, Tsinghua University and so on. Research has been carried out in many aspects, such as mathematical and physical factors, quality prediction criteria, data preprocessing and thermal parameter testing. Some of them have been combined with practical application, played a certain effect, and began to form China’s own characteristics.
Jin Junze and Guo Kechu of Dalian Institute of technology took the lead in compiling a general program for temperature field simulation by using the finite difference method, and put forward the treatment methods of solidification latent heat release of pure metals and alloys, solid rate calculation, material thermophysical parameters and air gap at the interface between sand casting and mold, and used this software to simulate the solidification process of large marine propeller. Zheng Xianshu and Jin Junze simulated and analyzed the dynamic stress distribution of sand casting stress frame from solidification to cooling by thermoelastic method, studied the solidification process of continuous casting billet by numerical simulation, and measured the solidification of continuous casting billet of Shougang. The simulation results are basically consistent with the measured results.
Zhang Yi of Shenyang Foundry Research Institute used the finite difference method to simulate the large turbine blades and general large steel castings, and verified the simulation results through experiments. Zhu Xianhua of Xi’an Jiaotong University used the direct difference method to simulate the pure aluminum cylindrical sand casting, and compiled the preprocessing program automatically formed by the data. Wang Shenqiang of Harbin Institute of technology developed a set of software for solidification simulation and shrinkage porosity determination of two-dimensional sand castings. Using the software, three test schemes of thermal insulation riser and thermal insulation subsidy process of steel castings in Daqing general machinery plant were numerically simulated, and the simulation results were consistent with the actual test results.
Chen Haiqing and Li Huaji of Chongqing University simulated the sand casting of alloy plate by measuring the thermal conductivity of sand mold. Kang Jinwu of Tsinghua University simulated the solidification process of cast steel stress frame with FDM / FEM integrated stress analysis system, and obtained the quantitative, dynamic deformation and stress change of stress frame, After analyzing the solidification results, it is pointed out that the position with large tendency of hot cracking.
At present, the sand casting solidification simulation technology of Tsinghua University, Huazhong University of science and technology and Harbin University of technology is at the leading level in China. Among them, Tsinghua University has successively completed a number of national projects in the research direction of numerical simulation of solidification process of sand castings, and has accumulated a solid foundation in the research of solidification process of large, complex and high-precision sand castings.