界面传热系数对铸造凝固过程温度场的影响

摘要

为研究重力铸造和反重力铸造凝固过程中铸件/铸型间界面传热系数对温度场的影响,利用ANSYS有限元软件模拟了铸造凝固过程的温度场,并将模拟数据与实际测量的温度进行了对比.研究结果表明:无论是重力浇铸,还是凝固压力为17.12 kPa和30.90 kPa的反重力浇铸,对于模拟温度场与实际测量的温度场的接近程度,考虑界面传热系数要优于不考虑界面传热系数；随着凝固压力的增大,铸型/铸件界面的传热能力提高,铸件凝固速度增加,凝固时间缩短.%The finite element analytical software ANSYS is used to simulate the temperature field of solidifying process and to study the effects of interface heat transfer coefficient of different pressures on the temperature field. A comparison of the simulated data with the experimental results show that the difference between the simulated temperature and the measured temperature is more slight when the interface heat-transfer coefficient is considered than that without consideration of the interface heat-transfer coefficient whether in gravity casting or counter-gravity casting under the pressure of 17. 12 kPa or 30. 90 kPa. The solidification rate increases and the solidification time decreases when the solidification pressure increases.