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采用直接差分法求解热传导方程,对T型铸件凝固过程中的温度场进行模拟,研究了界面热阻对温度场分布和凝固速率的影响。结果表明:在铸件凝固过程中,随着铸件/铸型热阻的减小和铸件/空气热阻的增加,整个铸件从冒口位置和侧面同时向内部区域凝固;随着铸型/空气热阻的减小,热量传输迅速,凝固过程加快。在实际工艺设计中,减小冒口位置附近的凝固速率,增加拐角区域和侧面凝固速率,使得冒口、拐角处和侧面凝固趋于同步,从而减少各类缺陷的形成,提高铸件的力学性能。
The direct difference method is used to solve the heat conduction equation. The temperature field during the solidification process of T-cast is simulated. The influence of interface thermal resistance on temperature field distribution and solidification rate is studied. The results show that with the decrease of the thermal resistance of the casting / mold and the increase of the thermal resistance of the casting / air during the solidification of the casting, the whole casting solidifies from the position of the feeder and the side to the inner region at the same time. With the mold / air heat Reduced resistance, rapid heat transfer, the solidification process to speed up. In the actual process design, the rate of solidification near the riser is reduced and the solidification rate in the corner area and side is increased, so that the riser, corner and side solidification tend to synchronize, thereby reducing the formation of various defects and improving the mechanical properties of the castings .