本文对直径为46mm的水平连铸灰铸铁棒材进行凝固数值模拟。通过实测石墨套内温度场及数值计算,用传热学反问题求解方法确定铸棒表面的热流边界条件。采用所求得的铸棒表面热流分布函数,进行了计及铸棒轴向传热的凝固数值模拟,所得凝固前沿形貌与实际情况大体接近。在此基础上,进一步用凝固模拟方法研究了水平连铸铸铁棒材生产中主要工艺参数对结晶器出口处棒材凝固层厚度的影响。
The solodification process of horizontal continuous cast gray iron barof 4.6 cm in diameter was simulated. The function for distribution of heat fluxon the internal surface of graphite sleeve, which is equal to that on the surface ofiron bar, was inversely derived by using numerical calculation from the tempera-ture distribution in the sleeve measured in real production. By using the distribu-tion of heat flux as a boundary condition on the surface of iron bar, numericalsimulation on solidification of iron bar taking longitudinal heat conduction intoaccount was made. The profile of solidification front obtained from numerical si-mulation was approximately similar to that in real production. In addition, thequantitative relationships of the thickness of solidified layer at the exit of crys-tallizer with the main technological parameters, including the temperature of liq-uid iron at entrance of crystallizer, the moving speed of the bar and the intensityof water cooling, were obtained by using numerical simulation.
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