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Geometrical effects on filling dynamics in low pressure casting of light alloys

Article dans une revue avec comité de lecture
Article dans une revue avec comité de lecture
Author
BEDEL, Marie
211915 Mechanics surfaces and materials processing [MSMP]
104710 Institut Jean Lamour [IJL]
SANITAS, Antonin
211915 Mechanics surfaces and materials processing [MSMP]
EL MANSORI, Mohamed
211915 Mechanics surfaces and materials processing [MSMP]
85714 Laboratoire de Mécanique et Procédés de Fabrication [LMPF]

URI
http://hdl.handle.net/10985/16936
DOI
10.1016/j.jmapro.2019.06.006
Date
2019
Journal
Journal of Manufacturing Processes

Abstract

In aluminum low-pressure sand casting process, filling oscillations are observed when the metal front reaches a section change in a part. The effect of geometry on the filling oscillations is primary considered experimentally, including both mold cavity and filling system geometries. To highlight the geometric parameters impacting the oscillations, the pressurized melt flow is secondly studied numerically and analytically. A new analytical model of oscillation is developed to quantitatively predict the oscillations. It links the resulting filling velocity to both the low-pressure casting parameters and the mold cavity geometry. Considering oxides inclusion criterion from casting literature, new rules to avoid bi-films defects are recommended for making reliable low-pressure castings.

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