Process and apparatus for the uphill low pressure casting of metal, particularly light metal
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United States of America Patent
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Nov 27, 2001
Grant Date -
N/A
app pub date -
Apr 29, 1999
filing date -
May 13, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
In the case of uphill low pressure casting of metals, particularly light metal, a casting mold is connected by its gate, via a riser to a melting container and the melt contained therein is displaced under pressure through the riser into the mold. For increasing the casting capacity while maintaining a high quality of the casting, most of the melt volume necessary for filling the mold is displaced into the latter at the maximum casting speed, then the melting column in the riser is sheared and a residual volume remaining between the shearing point and the gate is displaced into the mold with a negative speed gradient. An apparatus for performing the above process is includes a tubular portion provided between the riser and the gate, the tubular portion forming a residual volume, an opening being formed between the riser and the tubular portion. A controlled displacer is movable at controlled speed between a casting position freeing the opening between the riser and the tubular portion, via an intermediate position closing the opening, into an end position closing the gate
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