Numerical Simulation Of The Whole Process Of Aluminium Alloy Die Casting Filling And Solidification

Aluminum die castings is widely used i n the automotive, aerospace and other fields, The filling process of die castings is very complex, In this process, it is prone to appear wrap gas, slag, cold traps and other defects, To avoid these defects, In practice, people often depend on the experience of generation to avoid defects, This approach increases the cost of the product. Therefore, the numerical simulation of the mold filling process and the temperature field to predict the size and the location of defects becomes meaningful. It is also an effective way to transform the traditional casting industry.In this study, its theoretical basics on computational fluid dynamics and the calculated heat transfer, taking advantage of large common computational fluid software fluent, To simulate and analysis the filling process flow field and temperature field of Casting. The purpose is to explore the numerical simulation feasibility of Fluent to solver the filling and solidification process of casting. Providing a reference for the study of casting simulation, so as to achieve the purpose of optimizing the casting process.By studying the following conclusions:1) Drain overflow tank has influence on the stability of liquid metal in the filling process, it can improve the liquid metal stability and exhaust effect through changing the amount and locations.2) "T" shaped multi-runner gating system is prone to produce wrap gas and water shortage defects in the filling process, The fan-shaped single runner is not only kept stable, But also avoided the generation of these defects in the filling process, which provides a foundation for mold design in actual production.3) Under reasonable gating system, Injection speed has a greatly influence on the quality of the castings. In this paper, it is compared with simulated experiments under different injection speed, Determining the reasonable injection speed: 0.5m / s.4)Treat the transient temperature field of filling process as the initial moment of solidification temperature, Seting the boundary conditions, simulating the temperature fields during solidification. Breaking the hypothesis that Instant filling and the temperature uniformity.