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首页> 外文期刊>Transactions of the American Foundrymen's Society >Countergravity casting of thin-wall Al A356, part II: results of casting characterization studies
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Countergravity casting of thin-wall Al A356, part II: results of casting characterization studies

机译：薄壁Al A356的反重力铸​​造，第二部分：铸造表征研究的结果

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摘要

The objective of this preliminary study was to investigate the capability of the countergravity casting process to produce thin-wall aluminum A356 castings, and compare these results with those obtained using a traditional gravity sand moldingmethod. The castings concerned were positioned around a central sprue in a tree-like arrangement. It was noted that, for castings on the upper level of the tree prepared using the countergravity method, both surface roughness and porosity levels weregenerally higher than with the traditionally cast samples.Aluminum countergravity castings cast at 1250F(677C) with a filling vacuum pressure of -5" Hg have thin-wall section castability that is comparable to gravity-poured castings poured at 137SF (746C) at atmospheric pressure. Castability of thin-wallaluminum countergravity casting is better when cast at 1350F (732 C) with a filling pressure of -5" Hg, in comparison to castings poured at lower temperatures with similar filling pressure. The countergravity casting of aluminum improves casting yield.Economic benefits of countergravity casting may be realized through the ability to cast at lower temperatures, and an increase in casting yield. Further work may be necessary to optimize filling conditions and gating aspects of the countergravity process.
机译：这项初步研究的目的是研究反重力铸造工艺生产薄壁A356铝铸件的能力，并将这些结果与使用传统重力砂造型方法获得的结果进行比较。有关的铸件以树状布置放置在中心浇口周围。需要注意的是，对于使用反重力法制备的树的上层铸件，表面粗糙度和孔隙率水平通常都高于传统铸造样品。在1250F（677C）下铸造的铝反重力铸件的真空压力为-5“ Hg的薄壁截面铸造性能可与在大气压力下以137SF（746C）浇注的重力浇铸的铸件相媲美。薄壁铝反重力铸件的浇铸压力为1350F（732 C）时，浇铸性更好。 -5英寸汞柱，与在较低温度下以类似填充压力浇铸的铸件相比。铝的反重力铸​​造可提高铸造产量。反重力铸造的经济效益可通过在较低温度下铸造的能力以及提高铸造产量的方式实现。为了优化反重力过程的填充条件和浇口方面，可能需要进一步的工作。

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