典型环形铸件凝固过程的界面换热系数分析  

Analasis of interfacial heat transfer coefficient of typical annular casting during solidification process

作　　者：邱克强[1] 张令 孙治国[1] 向青春[1] 张伟[1] QIU Ke-qiang;ZHANG Ling;SUN Zhi-guo;XIANG Qing-chun;ZHANG Wei(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2021年第2期156-162,共7页Journal of Shenyang University of Technology

基　　金：辽宁省教育厅重点科研项目(201724123).

摘　　要：为了提高铸造数值模拟软件精度,考虑到外砂型和内砂芯的传热过程差异性,针对典型铝合金环形铸件设计了砂型重力铸造过程测温实验,建立了环形铸件外砂型及内砂芯的界面热流和界面换热系数的反算数学模型,利用MATLAB软件编写界面换热系数反算程序.结果表明,铸件凝固过程中铸件/内砂芯的界面换热系数始终大于铸件/外砂型的界面换热系数,且铸件/外砂型界面换热系数的变化主要来源于界面间隙,反算误差结果验证了反算程序的可行性.In order to improve the software accuracy for casting numerical simulation,the temperature measuring experiment for the sand mold gravity casting process of typical annular cast of aluminum alloy was designed,considering the difference of heat transfer process between outer sand mold and inner sand core,and an inverse mathematical model for both interfacial heat flux and interfacial heat transfer coefficient(IHTC)of outer sand mold and inner sand core of annular casting was established.In addition,an inverse calculation program of IHTC was compiled with MATLAB software.The results show that the IHTC between the casting and the inner sand core is always higher than that between the casting and the outer sand mold,and the variation of IHTC between casting and the outer sand mold is mainly due to the interfacial gap between them.The results of inverse calculation errors verify the feasibility of our inverse calculation program.

关 键 词：砂型铸造 环形铸件 外砂型 内砂芯 界面热流 界面换热系数 反算数学模型 界面间隙 

分 类 号：TG249.2[金属学及工艺—铸造]