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Mould filling observations of aluminium melts in vacuum-sealed sand moulds
Högskolan i Jönköping, Tekniska Högskolan.
1999 (Engelska)Rapport (Övrigt vetenskapligt)
Abstract [en]

In order to clarify how the ingate system design influences the mould filling behaviour of aluminium melts in vertically parted vacuum-sealed moulds, some direct observation experiments have been made. A detailed study of how the design of each component in the ingate system affects the mould filling behaviour has been made. The effect of different designs on downsprue-runner connections, runners and end-wall of the runners as well as the effect of wall friction was investigated. The mould filling process was studied through a glass wall and recorded by a video camera. Still images from the videotape are presented and evaluated. The direct observation method has been found to be a very powerful way to follow the melt behaviour during mould filling. To ensure a good filling of the downsprue the melt level in the pouring basin has to be above a certain level from the time when the stopper is removed and during the whole filling sequence. A perpendicular connection between the downsprue and the runner gives a larger flow loss than a rounded type. Due to the larger flow loss the perpendicular connection results in an earlier filling of the downsprue. A tapered runner results in almost simultaneous filling of the specimens compared to a runner with no tapering. On the other hand the tapered runner gives a more divergent melt front which increase the free melt surfaces in contact with air. An additional pocket at the end of the runner has a beneficial effect on the mould filling. A sharp angled pocket is better than a more rounded type. Decreasing the wall thickness increases the flow loss due to wall friction, and causes more significant heat losses.

Ort, förlag, år, upplaga, sidor
Jönköping: Ingenjörshögskolan , 1999. , s. 11
Serie
JTH research report, ISSN 1404-0018 ; 1999:5
Nyckelord [en]
Ingate system, Mould filling, Runner, Downsprue, Wall thickness
Nationell ämneskategori
Materialteknik
Identifikatorer
URN: urn:nbn:se:hj:diva-39OAI: oai:DiVA.org:hj-39DiVA, id: diva2:4099
Tillgänglig från: 2004-11-17 Skapad: 2004-11-17 Senast uppdaterad: 2019-01-10

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Svensson, Ingvar L

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