Treating molten metals by moving electric arc

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 27/02 (2006.01) B22D 7/00 (2006.01) B22D 11/00 (2006.01) B22D 27/06 (2006.01) H05B 3/60 (2006.01) H05B 7/00 (2006.01) H05H 1/48 (2006.01)

Patent

CA 2431136

An apparatus (10) and a method for reducing inclusions, shrinkage blowholes, porosity and segregation in metal castings during the casting process, and for improving the grain structure, mechanical properties and yield of ingots and other castings. The apparatus (10) comprises: At least one electrode (14) for forming a moving electric arc (16) over the upper surface (18) of a metallic casting (12) being cast and a stand (20) for suspending the electric arc electrode (14) over the upper surface (18) of the metallic casting (12) during or after pouring and a second electrode (24) attachable to a metallic surface (26) of the mold (28) being used for casting, for completion of an electric circuit (30) including the electric arc (16) and electronic controls (32) connected between the apparatus (10) and a power supply (34).

L'invention concerne un appareil (10) et un procédé servant à réduire, au cours du moulage, les inclusions, les retassures d'air, la porosité et la ségrégation existant dans des produits métalliques coulés, et à améliorer la structure des grains, les propriétés mécaniques et la mise au mille de lingots et autres produits coulés. L'appareil (10) comprend : au moins une électrode (14) permettant de former un arc électrique (16) mobile, laquelle électrode est placée au dessus de la surface supérieure (18) d'un produit métallique (12) coulé pendant son moulage ; un support (20) servant à suspendre l'électrode de l'arc électrique (14) au dessus de la surface supérieure (18) du produit métallique (12) pendant ou après la coulée ; une seconde électrode (24) pouvant être fixée sur une surface métallique (26) du moule (28) utilisé pour le moulage, laquelle électrode termine un circuit électrique (30) comprenant ledit arc électrique (16) ; et des unités de commande (32) électroniques connectées entre l'appareil (10) et la source d'énergie (34) électrique.

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