铝合金砂型低压铸造界面传热系数的测定  

Determination of Interfacial Heat Transfer Coefficient during the Low Pressure Sand Casting Process of Aluminum Alloy

作　　者：汪壮显 洪润洲 熊艳才 杨守杰 左强 Wang Zhuangxian;Hong Runzhou;Xiong Yancai;Yang Shoujie;Zuo Qiang(Beijing Advanced Engineering Technology and Application Research Center of Aluminum Materials,Beijing Institute of Aeronautical Materials)

机构地区：[1]中国航发北京航空材料研究院,北京市先进铝合金材料及应用工程技术研究中心

出　　处：《特种铸造及有色合金》2018年第12期1323-1327,共5页Special Casting & Nonferrous Alloys

摘　　要：以典型板形试样的砂型低压铸造为基础,采用热传导反算法对ZL114A铝合金/树脂砂的界面传热系数进行了反求,并对界面传热系数随温度的变化关系进行了分析。结果表明,界面传热系数在液相线温度以上时基本保持恒定,约为335W獉m^(-2)獉K^(-1);当温度下降到530～573℃之间时,界面传热系数迅速下降;当温度下降到530℃之后,界面传热系数缓慢下降,最后逐渐稳定在60W獉m^(-2)獉K^(-1)左右。通过对反求得到的界面传热系数进行非线性拟合,得出了该工艺条件下界面传热系数随界面温度变化的经验公式。最后将反求得到的界面传热系数应用到ProCAST软件中对铸件的温度场进行仿真计算,计算结果表明,模拟温度与实测温度具有较好的一致性,最大温度偏差约为12℃。Interfacial heat transfer coefficient (IHTC)between ZL114A aluminum alloy and resin sand was obtained by a inverse heat conduction problem (IHCP)method during the low pressure sand casting process of a typical plate shape casting,and the relationship between IHTC and temperature was analyzed.The results indicate that IHTC remains at an approximately constant of 335W ·m^-2·K^-1 when temperature is above liquidus value.Then the IHTC is decreased rapidly as the temperature is inclined to 530~570℃.Finally,when the temperature is less than 530℃,the IHTC is decreased gradually to an approximately value of 60W·m^-2·K^-1.The empirical equation of IHTC as a function of temperature was established by non-linear fiting.The reversely calculated IHTC was applied to the temperature calculation of the casting with ProCAST software.The results reveal that the calculated temperature agrees well with the experimental temperature with the maximum deviation less than 12℃.

关 键 词：界面传热系数 砂型低压铸造 反算法 

分 类 号：TG244.3[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]