摘要
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 interface transfer coefficient obtained by inverse calculation was used to calculate the temperature field of an ingot produced by a sand mold. The calculated results show that the influence of the interface transfer coefficient on the ingot solidification was very weak. Then a set of modified thermal physical parameters was used＇to simulate the temperature field of the ingot, which was compared with the measured temperature field of the ingot casted by a sand mold. It is found that the modified thermal physical parameters greatly increase the precision of the simulation temperature field. Through the comparison of the average errors of the ingot＇s temperature field led by the interface transfer coefficients before and after the modification, and the average errors of the ingot＇s temperature field arisen from the thermal physical parameters before and after the modification, it is show that the most precise simulation temperature field can be gotten by adopting both the interface transfer coefficient by inverse calculation and the modified thermal physical parameters of mold sand, and the effect of the latter is more great.
出处
《铸造技术》
CAS
北大核心
2015年第2期389-393,共5页
Foundry Technology
基金
国家重点基础研究发展计划资助项目(2011CB610402)
关键词
湿型砂
温度场反算法
界面换热系数
型砂热物性参数
green sand
inverse calculation of temperature field
interface transfer coefficient
thermal physical parameters of mold sand
