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Please use this identifier to cite or link to this item: http://dspace.lib.cranfield.ac.uk/handle/1826/12456

Document Type: Conference paper
Title: Quality assesment of casting filling method
Authors: Jolly, Mark
Reilly, C
Issue Date: 2008
Citation: Jolly MR, Reilly C, Quality assesment of casting filling method, TMS 2008 Annual Meeting at the 137th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, 9-13 March 2008, New Orleans, USA Supplemental Proceedings, Vol. 3: General Paper Selections, pp. 9-14
Abstract: The reliability of cast components is dependent on the quality of the casting process. This can be characterised by the robustness (repeatability) and specific fluid flow characteristics within the running system. During this transient filling phase the prevention of free surface turbulence and thus oxide entrainment is critical to the mechanical integrity of the component [1,2,3]. Past research has highlighted that return waves are major causes of free surface entrainment [4]. To reduce the entrainment occurring during the transitional filling of the runner a steady quiescent flow must be developed. Using FLOW-3D(1), the Froude number was extracted to allow the quantitative assessment of air entrainment for four different designs of sump at the end of the runner. The results show that, for the designs used, the addition of a correctly designed sump can be advantageous. However, an incorrect design may reduce the Froude number but can greatly increase the persistence of the return wave and entrainment and is therefore extremely detrimental to the cast component. Additionally, the in-gate design is of utmost importance in controlling the back pressure and thus the persistence of the back wave between the in-gate and the downsprue exit. This has a direct effect of the level of oxide entrainment.
URI: http://dspace.lib.cranfield.ac.uk/handle/1826/12456
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