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用反算得到的界面换热系数对砂型铸锭的温度场进行了模拟计算。结果表明,对砂型铸锭来说,界面换热系数对铸件温度场的影响很小。然后优化了型砂的热物性参数,用这些参数对砂型铸锭的温度场进行了计算,并与实测温度场进行了对比,发现优化后的型砂热物性参数显著提高了温度场的模拟精度。最后,通过对反算前后砂型铸锭界面换热系数,以及型砂热物性参数修正前后对砂型铸锭温度场模拟平均差的对比,说明同时采用反算后的界面换热系数和修正后的型砂热物性参数,可获得模拟精度最高的温度场,其中热物性参数的影响最为明显。
The temperature field of the sand ingot was simulated by using the inverse heat transfer coefficient of the interface. The results show that for the sand ingot, the interfacial heat transfer coefficient has little effect on the temperature field of the casting. Then, the thermophysical parameters of the sand are optimized. The temperature field of the sand ingot is calculated with these parameters and compared with the measured temperature field. It is found that the optimized physical properties of the sand significantly improve the simulation accuracy of the temperature field. Finally, by comparing the interface heat transfer coefficient before and after the sand cast ingot and the average temperature difference between the simulated and simulated sand physical parameters before and after the correction, it shows that the calculated interface heat transfer coefficient and the modified sand Thermophysical parameters can obtain the temperature field with the highest simulation accuracy, of which the thermophysical parameters have the most obvious influence.