铝铸件凝固模拟边界热交换系数的测定

Determination of boundary heat-transfer coefficient for casting solidification simulation

铸件/铸型边界热交换系数的准确性是凝固模拟精度的关键因数之一。在实验研究基础上,应用非线性估算法确定了铝铸件凝固模拟边界热交换系数变化规律,并通过数学分析建立了一种近似求解边界热交换系数的通用数学模型。通过实际铝铸件进行的模拟验证,证明了该模型的正确性和通用性。

The boundary heattransfer coefficient at casting /mould interface is a key factor affecting solidification simulation accuracy. Based on experimental research, the boundary heattransfer coefficient for casting solidification simulation was determined by using nonlinear estimate calculation method. The approximate method to calculate boundary heattransfer coefficient was also established by mathematics analysis. The general model of boundary heattransfer coefficient is a function with change of time. At last, the simulation results were contrasted with actual casting results and it was verified that the general model is responsible.