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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
In order to understand the filling characteristics of pressure casting, the mathematical model of flow and heat transfer of liquid metal filled cavity was established based on the finite difference method. The flow and heat transfer of die - casting filling process were developed using SOL A - VOF numerical simulation Numerical simulation analysis software. The laminar flow hypothesis and K-ε turbulence model were respectively used to simulate the flow field in the filling process of the “bow” cavity and compared with the high-speed imaging of the die casting water simulation experiment. The results show that the turbulence model Die casting can be more accurately simulate the filling process. Finally, the simulation and analysis software was developed to simulate the flow field and temperature field of filling process of the actual die-casting with three-dimensional complex shapes. The temperature variation of the die on the surface of the cavity during filling was analyzed. The concept of “transient layer” greatly reduces the computing area and improves the computational efficiency