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	铝合金熔模精密铸造界面换热系数测量
	邵珩 ; 罗志辉 ; 李岩 ; 赵亚利 ; 南海 ; 许庆彦 ; SHAO Heng ; LUO Zhi-hui ; LI Yan ; ZHAO Ya-li ; NAN Hai ; XU Qing-yan
	2016-03-30 ; 2016-03-30
关键词	熔模铸造 界面换热系数 非线性估算法 铝合金 Ceramic forming Direct coagulation casting High valence counter ions Controlled release TG292
其他题名	Determination of Interfacial Heat Transfer Coefficient During the Investment Casting of Aluminum Alloy
中文摘要	熔模精密铸造对于铸件近净成形具有重要意义,但目前鲜见对其铸件-铸型界面换热系数的相关研究。本试验在一维传热模型中采用非线性估算法对工业纯铝在熔模铸造过程中与型壳的换热行为进行了研究,分析结果表明:在凝固前期,铸件与型壳之间的热流密度基本不变,而界面换热系数随两者温差减小而增大;凝固中期,界面换热系数随着整体固相分数增加而线性下降;凝固后期,界面换热系数下降变得十分缓慢。将在一维模型中反求得到的界面换热系数应用到三维铸件模型中,得到的模拟温度与实测温度基本吻合,证明通过一维模型与非线性估算法求取的界面换热系数比较准确,有望在铝合金精密铸造温度模拟中得到应用。; Investment casting is a very important near net shape process for casting, while the research for the interfacial heat transfer coefficient(IHTC) between casting and shell during investment casting is very rare. The IHTC between aluminum casting and shell in investment casting was determined on the basis of the experimental data and a 1-D model with the nonlinear estimation method. The results indicate that the interfacial heat flux remains largely unchanged while the IHTC increases with the decreasing temperature difference between casting and shell during the first stage of solidification. Then the IHTC decreases linearly as the solid fraction increases in the second stage. Afterwards the IHTC drops very slowly. The relationship between the IHTC and the condition of the casting based on the 1-D model was applied to the temperature calculation of the actual 3-D model of casting and shell and the calculated temperature data were close to the experimental data,the interfacial heat transfer coefficient which was obtained by a 1-D model and the nonlinear estimation method is correct, thus the relationship may be applied to the temperature simulation in investment casting of aluminum.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/141758]
专题	清华大学
推荐引用方式 GB/T 7714	邵珩,罗志辉,李岩,等. 铝合金熔模精密铸造界面换热系数测量[J],2016, 2016.
APA	邵珩.,罗志辉.,李岩.,赵亚利.,南海.,...&XU Qing-yan.(2016).铝合金熔模精密铸造界面换热系数测量..
MLA	邵珩,et al."铝合金熔模精密铸造界面换热系数测量".(2016).

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