界面热阻对铸件凝固过程温度场的影响  

Influence of Thermal Resistance at Interface on Temperature Field of Cast in Solidification Process

作　　者：袁训锋[1,2] 胡瑞霞[1] 李英[1] 魏蕾[1] 李磊[1] 蒲立婷 

机构地区：[1]商洛学院电子信息与电气工程学院,陕西商洛726000 [2]商洛学院陕西省尾矿资源综合利用重点实验室,陕西商洛726000

出　　处：《铸造技术》2015年第7期1784-1788,共5页Foundry Technology

基　　金：陕西省教育厅专项科研计划资助项目(14JK1223);陕西省教育科学"十二五"规划资助项目(SGH13401);商洛学院博士启动基金资助项目(12SKY01-1)

摘　　要：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 heat conduction equation was solved by direct differential method, the temperature field of T-type cast in the solidification process was simulated, and the effects of the thermal resistance at interface on the temperature distribution and the solidification rate were studied. The results show that, during the solidification process of cast, with the decrease of the cast/mold thermal resistance and the increase of cast/air thermal resistance, the solidification of the cast is from the riser position and side to the inner region at the same time. With the decrease of the mold/air thermal resistance, the heat transfer speed and the solidification rate increase. In the actual design process, decelerating the solidification rate of the riser region and accelerating the solidification rate of the comer and side region can make the solidification rate of the comer, side and riser region tend towards harmony, it can reduce the formation of various types of defects and improve the quality of the casts.

关 键 词：凝固过程 温度场 界面热阻 凝固速率 

分 类 号：TG244.3[金属学及工艺—铸造]