压力铸造充型过程流动与传热数值模拟的研究

为了解压力铸造的充型特点 ,基于有限差分法建立了液态金属充填型腔过程的流动及耦合传热计算的数学模型 ,使用 SOL A - VOF数值模拟技术开发了压铸充型过程流动与传热的数值模拟分析软件。分别用层流假设和 K- ε紊流模型对“弓”形型腔的充型过程的流场进行了模拟计算 ,并与压铸水模拟实验的高速摄像进行比较 ,结果表明 ,采用紊流模型能更精确地模拟压铸充型过程。最后使用所开发的模拟分析软件 ,对具有三维复杂形状的实际压铸件的充型过程的流场、温度场进行了模拟 ,并分析了充型过程中模具在型腔表面的温度变化规律 ,提出“瞬态层”的概念 ,大大缩小了计算区域 ,提高了计算效率

Numerical simulation of fluid flow and heat transfer during mold filling for die casting

A mathematical model was developed for simulating the fluid flowand heat transfer phenomena during mold filling for die casting using the finite difference method. A computational program was developed based on the SOLA-VOF algorithm. The model was verified by numerically simulating the filling of a S-shaped cavity with either laminar or turbulent flow. The simulation results showed that the turbulent model is more accurate for high-pressure die casting when compared with benchmark test results. Finally, the filling of a complicated 3-D die casting component was simulated with a “transient surface layer” concept proposed to describe the temperature distribution in the die after the filling process.