(1. 湖南大学 汽车车身先进设计与制造国家重点实验室，长沙 410082；
2. 湖南大学 机械与运载工程学院，长沙 410082；
3. 湖南大学 材料科学与工程学院，长沙 410082)
摘 要: 在改进Hamasaiid模型的基础上提出了新的金属型铸造界面换热系数峰值hmax预测模型，该模型引入表面张力参数，定量研究其对界面换热的影响。采用A356铝合金金属型重力铸造实验对模型进行验证。结果表明：反求计算的hmax约为5944 W/(m2？K)，采用Hamasaiid模型计算的hmax约为7987 W/(m2？K)，误差约为34%；新模型未考虑表面张力时计算的hmax约为6228 W/(m2？K)，误差约为5%，考虑表面张力时计算的hmax约为5992 W/(m2？K)，误差约为1%。新模型计算精度有较大提升，计算结果与反求结果具有很好的一致性，表面张力对计算精度有一定影响。
关键字: 界面换热系数；金属型重力铸造；表面粗糙度参数；表面张力；接触热阻；反热传导法
（1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University,
Changsha 410082, China;
2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China;
3. College of Material Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:The new predictive model of metal casting interfacial heat transfer coefficient peak value (hmax) was proposed by improving Hamasaiid’s model. The surface tension was introduced into the model, its impact on the interfacial heat transfer was quantitatively studied. A356 aluminum alloy gravity die casting experiments were performed in order to validate the model. The results show that the hmax value calculated by the inverse heat conduction method is about 5944 W/(m2？K), the result of Hamasaiid’s model is about 7987 W/(m2？K), and the error is about 34%. The hmax value calculated by the new model is about 6228 W/(m2？K), and the error is about 5%, but if the surface tension is considered, the result is about 5992 W/(m2？K), and the error is about 1%. The calculation accuracy of the new model was greatly improved, the calculation results are in good agreement with the inverse results. The surface tension has a certain impact on the calculation accuracy.
Key words: interfacial heat transfer coefficient; metal mold gravity die casting; surface roughness parameters; surface tension; thermal contact resistance; inverse heat conduction method
