期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 209, 期 17, 页码 5736-5750出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2009.06.003
关键词
Aluminum gravity casting; Multiple gates; Runner system; Coefficient of discharge; Clean-up time
资金
- Overseas Research Students Awards Scheme (ORS) of UK Universities
The L-shaped junctions in running and gating systems used in aluminum gravity casting have been investigated. Using computational modeling, a guideline for constructing two geometries of L-junctions was developed. The sequential filling profile of liquid metal along L-junction was confirmed by real-time X-ray video of an aluminum alloy sand casting. The change of flow direction through L-junctions can yield a high coefficient of discharge Cd, without entrapping detrimental oxide film defects because of the smooth flow, minimizing surface turbulence. A short clear-up time, the duration of filling a component, of L-shaped junction is also achieved. For the necessary of future application of this junction. its dimensionless equivalent lengths (L(E)/D) and loss coefficient K were estimated. The main aim of this work was to eliminate the trial and error approach as designing a multiple-gate system. From the guideline of L-junction, the two junctions can be assembled into a complex multiple-gate runner system. In this novel design of multiple-gate system, uniform distribution of flow through each gate into a mould cavity has been demonstrated. A high Cd value was also predicted. (C) 2009 Elsevier B.V. All rights reserved.
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