Present situation of casting technology at China and abroad

In foreign countries, the analysis unit of “heat and mass flow analyzer” of Columbia University was first used in casting simulation technology. Prosenjit Das et al. Used regression analysis method and Taguchi method to optimize the process of ordinary sand mold casting of aluminum alloy materials, and obtained the best process parameters by adjusting temperature and runner length. At present, the main casting numerical simulation technology mainly includes: numerical simulation of temperature field, numerical simulation of flow field and Simulation of stress field. The type, size and location of casting defects can be predicted through the simulation of three physical fields. One of the most complex is the numerical simulation of mold filling process, which mainly involves theoretical calculations such as continuous equation, energy equation, repeated iteration of pressure field, velocity field and kinetic energy equation calculation (Wang Guangyu, 2016). At present, with the continuous development of microstructure simulation technology in the industry, the mechanical properties of castings can be simulated, predicted and controlled. However, the simulation of microstructure is still in the exploratory stage, and the simulation of too small elements can not be accurately divided and simulated.

In China, Dalian University of technology and Shenyang Institute of foundry started the research of numerical simulation of casting. At present, Tsinghua University and Huazhong University of science and technology are in a leading position. Chen Yao, Bai Xuefeng and others from Tsinghua University have compiled FT-Star software to simulate the stress field by using finite element method and finite difference method. The simulation results are very close to the actual situation and are relatively accurate (Li gailing, 2015). Zhou Jianxin and others from Huazhong University of science and technology also developed a casting simulation software Huazhu CAE. The simulation software can simulate the stress field accurately by combining two calculation methods, but it is affected by many factors. Wei zunjieti B lost foam air gap pressure algorithm, and used the calculated gas pressure value as SOLA-VOF to solve the boundary piece, successfully simulated the filling flow field.