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首页> 外文期刊>International Journal of Heat and Mass Transfer >A foam melting model for lost foam casting of aluminum
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A foam melting model for lost foam casting of aluminum

机译：铝消失模铸造的泡沫熔化模型

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摘要

In lost foam casting of aluminum the liquid metal normally decomposes the foam pattern by ablation. But sometimes polymer vapor bubbling through the liquid metal accumulates along an upward-facing flow front until it opens a finite gap between the liquid metal and the decomposing foam. This changes the foam decomposition mechanism along that front from direct ablation to melting. A mathematical model is formulated for heat conduction, convection, and radiation across the gap, coupled with the vaporization of the excess polymer liquid behind the metal front and the resulting buoyant movement of polymer vapor bubbles through the liquid metal. Both models are combined to obtain an analytical solution for one-dimensional bottom filling of a pattern with uniform thickness. The results from this solution not only compare well with available experimental data, but they also explain how part thickness, metal temperature, and pressure affect filling speeds in bottom-fill situations.
机译：在铝的消失模铸造中，液态金属通常通过烧蚀分解泡沫图案。但是有时，冒泡通过液态金属的聚合物蒸气会沿着朝上的流动前沿积聚，直到它在液态金属和分解的泡沫之间打开一个有限的间隙。这将泡沫分解机理从直接烧蚀变为熔化。建立了一个数学模型，用于通过间隙的热传导，对流和辐射，以及金属前沿后面多余的聚合物液体的汽化以及由此产生的聚合物蒸汽气泡通过液态金属的漂浮运动。将两个模型组合在一起，以获得用于一维底部填充厚度均匀的图案的分析解决方案。该解决方案的结果不仅与可用的实验数据进行了很好的比较，而且还解释了零件厚度，金属温度和压力如何影响底部填充情况下的填充速度。

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