Although the numerical simulation technology of temperature field has become practical, in fact, there are still many aspects worthy of research on improving the adaptability of sand casting shape complexity, calculation efficiency, high-quality visualization and convenient interface operation. For the above reasons and in order to achieve the objectives of our laboratory, this study will focus on the development of a set of basic solidification numerical simulation software for sand castings with independent intellectual property rights.
Through the comprehensive analysis of the research status and theoretical methods of numerical simulation technology of solidification temperature field of sand castings, the research is mainly carried out in the following aspects, and the specific contents are as follows:
- Study the calculation methods of numerical simulation software at home and abroad, integrate the current development situation of numerical simulation, consider the basic role of research on the laboratory, and adopt uniform grid division, and decide to use the difference quotient method instead of micro quotient method and direct difference method to jointly deduce the difference format for temperature field calculation. During this period, complete the preparation of temperature field program and realize the calculation of temperature field in metal solidification process. At the same time, it includes the treatment methods of studying the latent heat of metal solidification and the interfacial heat transfer coefficient in the solidification process.
- Study the criteria of shrinkage porosity and shrinkage cavity defects. According to the solidification characteristics of general sand castings and based on the calculation of temperature field, the shrinkage cavity defects of general sand castings are predicted by calculating the isolated region, and the shrinkage cavity defects of general sand castings are predicted by using the shrinkage compensation method, and the shrinkage porosity defects of general sand castings are predicted by using the criteria; The solidification characteristics of nodular iron castings with special solidification characteristics are studied. Through the dynamic superposition calculation of shrinkage and expansion in the solidification process, the shrinkage porosity and shrinkage cavity defects of nodular iron castings are predicted.
- By studying the display technology of the current numerical simulation software, it is decided to adopt the display technology based on and compile a general display program to realize the realistic and fast observation and display function of the simulation results. That is to realize the functions of real-time dynamic display, movement, scaling, rotation, blanking, sectioning and so on.
- Study the material database in the numerical simulation software. At the same time, considering the objectives of this study, it is decided to adopt the database development method to develop a simple and practical software material database with the functions of addition, deletion and modification, and embed it into the numerical simulation software.
- Finally apply the development software and compile the framework and interface of the numerical simulation software. Using the rich components provided, the software interface with relatively complete functions is compiled, and the processing modules of each part are integrated. Finally, the simulation results of the software are verified by the actual pouring experiment and the comparison of mature software in the market.