The certain type of broken axle housing is mainly used for tractor load-bearing bridges, with an annual output of 10000 units. The service conditions of the axle housing include plateau, saline alkali, desert and other multi terrain and multi latitude. Under the condition of full load, it must bear high impact load. Therefore, the quality requirements for the axle housing are very high. Therefore, the requirements for its process design, production and manufacturing process are high.
According to statistics, the axle housing has many shrinkage porosity and shrinkage cavity defects during sand casting, and the shrinkage cavity rate is as high as 70%, resulting in oil leakage and oil leakage of the axle housing during use, and the economic loss to the company is as high as more than 1 million yuan per year. In view of the problem that castings are prone to shrinkage cavity and porosity, it is proposed to use ProCAST finite element analysis software and combined with production practice to design closed, semi closed and open gating systems with different cross-sectional area ratios by using the pouring specific speed method. By analyzing the changes of flow field and temperature field of liquid metal in the process of filling and solidification, combined with the theory of pouring sequential solidification and simultaneous solidification, The purpose is to use the sand casting simulation analysis method to analyze the development and changes of flow field and temperature field in the filling process of sand casting axle housing, carry out the secondary optimization design of gating system and process parameters, and predict the defects, so as to provide theoretical and technical support for solving the practical difficulties of the company in the production process, and formulate a complete set of process optimization scheme. Thus, the sand casting quality of the axle housing is fundamentally improved, which has practical significance and popularization value.