Injection molding is an important plastic molding process, and the flow and heat transfer of melt in the mold cavity during the molding process have an important impact on the performance and quality of the final product. Therefore, it is of great significance to accurately predict the flow and heat transfer history of the injection molding process, and further predict the performance and quality indicators such as shrinkage, warping and mechanical properties of the injection molding product.

    In order to accurately describe the flow and heat transfer behavior of materials in the molding process, according to the process characteristics of injection molding process, the post-filling process is regarded as a unified process, considering the influence of material compressibility and phase transformation on the filling and post-filling process, a unified model of the post-filling process is established. The integrated simulation of injection molding filling after filling is realized by using finite element method, finite difference method and controlled volume numerical method.