ZL102凝固过程瞬态温度场的模拟与验证

Simulation and Verification of Transient Temperature Field During ZL102 Solidification Process

在Fourier导热微分方程基础上,充分考虑材料和边界条件等参数的非线性特征,采用等价比热容法处理结晶潜热,利用有限元法求解砂型铸造凝固过程的瞬态温度场。并对砂型铸造工艺进行测温实验,分别得到铸件、型芯和砂型内的测温曲线,测量温度与相应的计算温度基本吻合。针对计算温度与测量温度的偏差情况,从测温误差和计算模型两方面进行分析,提出了降低热电偶测温误差和提高模拟精度的具体措施。

The transient temperature field was solved to the ZL102 solidification process by using finite element method based on the fourier heat conduction differential equation. The nonlinear feature of material properties and boundary condition were considered, and the equivalent specific heat method was adopted to treat the latent heat. The temperature was measured and the temperature curves were acquired in the casting, core and sand mold. The measurement temperature was basically identical with the corresponding calculated one. The error between the measurement temperature and the calculated one was analyzed from the viewpoint on both the measurement error and the simulation model. Moreover, some measures were proposed on decreasinq the measurement error and improving the simulation accuracy.