Sökning: (WFRF:(Svensson Ingvar L)) srt2:(1995-1999) >
Mould filling obser...
Mould filling observations of aluminium melts in vacuum-sealed sand moulds
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- Bäckman, Jonas (författare)
- Jönköping University,Tekniska Högskolan
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Svensson, Ingvar L (författare)
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Maeda, Yasuhiro (författare)
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(creator_code:org_t)
- Jönköping : Ingenjörshögskolan, 1999
- Engelska 11 s.
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Serie: JTH research report, 1404-0018 ; 1999:5
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Abstract
Ämnesord
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- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Nyckelord
- Ingate system
- Mould filling
- Runner
- Downsprue
- Wall thickness
Publikations- och innehållstyp
- vet (ämneskategori)
- rap (ämneskategori)