Ingot mould for the continuous vertical casting of metals
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United States of America Patent
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Aug 29, 2000
Grant Date -
N/A
app pub date -
Jan 22, 1999
filing date -
Apr 5, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
This mold consists of a cooled mold body (1), made of copper or a copper alloy, on which sits a refractory feed head (2) and a purge slit (8) is made at the interface between said mold body and said feed head, via which a stream of a waste inert gas is injected around the internal perimeter of the mold. The slit is supplied via a plenum chamber (13) made within the mold, the plenum chamber being itself supplied with gas via inlets (12) which connect it to a pressurized-gas supply (20). The injection slit (8) is segmented around the mold perimeter with the aid of separating means (21) which also segment the plenum chamber into compartments (13', 13', etc.) which are juxtaposed around the perimeter of the mold so that an inlet (12) runs out into each compartment thus formed. Thus, a plurality of elementary circuits (12'- 13'- 8'), which are mounted 'in parallel' with respect to a single pressure chamber (20), are produced so that, overall, the injection of gas around the perimeter of the mold becomes insensitive to local perturbations such as local variations in the thickness of the slit.
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