(燕山大学 机械工程学院，秦皇岛 066004)
摘 要: 研究铝铸锭凝固边界热交换的变化规律及数学模型，并对不同浇注温度下凝固过程的温度场进行模拟。利用实时数据采集系统获得凝固过程中铸锭和金属模温度变化历史数据，采用非线性反算法和一维传热差分法对试验数据处理，建立界面换热模型并将其应用于凝固温度场模拟中。结果表明：在铸锭表面凝固前后凝固界面热流密度可分段用指数函数来描述其变化规律，而所建立的热交换系数与边界温度的对应关系可更好地反映实际的传热情况。模拟结果与实验测温结果相符，验证了该铸件/铸型边界热交换规律的可靠性。
关键字: 铝铸锭；热交换系数；凝固；温度场
（College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China）
Abstract:Abstract: The rules of heat exchange on the interface of casting and model were set up, and the solidification temperature fields were simulated. In the solidification process, the temperature history data of ingot and mold were recorded with a data acquirement system. Based on the experimental data, nonlinear estimation method and finite difference method of one dimensional heat transfer were adopted to form the model of interface heat transfer. With this model, the temperature field of the casting system was simulated. The results indicate that the heat flow in the interface of ingot and mold can be described by exponential function. The heat transfer coefficient related with boundary temperature is better reflecting the true state. The results of the simulation agree well with the measured values, which indicates that the models of the coefficient of interface heat transfer are reliability.
Key words: aluminum ingot; coefficient of heat transfer; solidification; temperature field
