Method and device for uphill casting, involving a casting...

B - Operations – Transporting – 22 – D

Patent

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B22D 18/04 (2006.01)

Patent

CA 2414770

The invention relates to a method and a device for uphill casting/low-pressure casting especially of light metal alloys said device comprising a casting furnace (81) lying below a casting plate (51) and comprising an ascending pipe (83), said pipe comprising an orifice (99); and a casting mould having a pouring gate (79) lying underneath and a sliding closure (11) which forms a through channel having an essentially straight longitudinal course for casting. In order to close the through channel, the sliding closure comprises two immediately adjacent opening segments pertaining to the through channel which are displaced towards each other transversally in relation to the longitudinal course of the through channel, immediately after the casting when the molten metal is still in a liquid state in the pouring gate, in such a way that one upper opening segment remains openly connected, without a back draft, to the pouring gate, and a lower opening segment remains openly connected to the orifice of the ascending pipe. Said opening segments are completely offset in relation to each other. The level of molten metal in the ascending pipe is then lowered below the orifice of the ascending pipe and the lower opening segment of the through channel is thereby emptied of the molten metal.

Procédé de coulée/coulée à basse pression ascendante, en particulier d'alliages de métaux légers, qui repose sur l'utilisation d'un dispositif comportant un four de coulée situé sous un plateau de coulée et doté d'un tuyau ascendant formant une bouche, et un moule doté d'un orifice de coulée placé vers le bas et d'une fermeture coulissante formant un canal traversant qui présente pour la coulée une trajectoire longitudinale essentiellement droite. La fermeture coulissante comporte deux segments d'orifice du canal traversant immédiatement adjacents qui, pour la fermeture du canal, sont poussés l'un vers l'autre transversalement par rapport à la trajectoire longitudinale du canal traversant, immédiatement après la coulée et en présence de métal en fusion encore liquide dans l'orifice de coulée, de manière telle qu'un segment d'orifice supérieur reste relié de manière ouverte avec l'orifice de coulée sans contre-dépouille et qu'un segment d'orifice inférieur reste relié de manière ouverte à la bouche du tuyau ascendant, les deux segments d'orifice étant alors complètement décalés l'un par rapport à l'autre. Ensuite, le niveau du métal fondu dans le tuyau ascendant est abaissé au-dessous de la bouche dudit tuyau, le segment d'orifice inférieur du canal traversant étant ainsi vidé du métal en fusion.

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