中文摘要：

为选择合适的砂型厚度，提高铸件成品率，利用COMSOL Multiphysics软件模拟了33^#锆刚玉熔体的冷却过程，分析了SiO2砂型厚度（分别为30、40、50mlTl）对冷却过程中铸件传导热通量分布和变化的影响。结果表明：1）SiO2砂型热导率小，不利于铸件表面的快速冷却；铸件中心截面上角部热通量大，冷却速度大，中心附近区域热通量小，冷却速度小。2）砂型厚度增加，铸件的最大热通量减小，冷却速度减小，而最大热通量的面积增大，有利于减小不同部位冷却速度差别；但厚度继续增加不能显著改善冷却速度不均现象，反而导致砂型工段成本增加和劳动强度显著增大，因此砂型厚度以40mm为宜。

英文摘要：

The cooling process of fused AZS 33^# was simulated by using COMSOL Multiphysics software, and the effect of SiO2 mould thickness （30,40 and 50 mm, respectively） on conductive heat flux distribution and change of the casting products during cooling was investigated in order to select the appropriate SiO2 mould thickness and increase the finished product rate of the casting products. The results show that. 1 ） the low thermal conductivity of SiO2 mould is bad for the rapid cooling of casting surface;heat flux at the upper corner of central section and the cooling rate are high, whereas the heat flux near the center area and the cooling rate are Iow;2）with the increase of the SiO2 mould thickness,the maximum heat flux of the casting product and the cooling rate decrease, but the area of the maximum heat flux increases, which is beneficial to reduce the cooling rate differences among different areas;but the further increase of thickness can＇t improve the cooling rate homogenization significantly, while increase the cost and labor intensity of the SiO2 mould workshop,so the optimum mould thickness is 40 mm.