A multiple-gate runner system for gravity casting

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Colleges, School and Institutes


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.


Original languageEnglish
Pages (from-to)5736-5750
Number of pages15
JournalJournal of Materials Processing Technology
Issue number17
Publication statusPublished - 1 Aug 2009


  • Coefficient of discharge, Clean-up time, Runner system, Aluminum gravity casting, Multiple gates