Improved beaver-tail tube assembly and tube changing method

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 41/56 (2006.01) B22D 11/10 (2006.01) B22D 41/50 (2006.01)

Patent

CA 2259488

An improved beaver-tail tube assembly (30a, 30b) is provided that is easily exchanged in place over a thin-slab casting mold (20) by means of a conventional tube changer (22). The tube assembly includes a rectangular plate (3), and a tube body (7) having a circular upper end that is mounted to an orifice in the plate for receiving molten metal, and a lower end (15) that is elongated along its width for discharging molten metal into the elongated opening of a thin-slab casting mold. In the tube assembly of the invention, the upper end of the tube body is mounted to the opening in the plate so that the longitudinal axis of the elongated bottom end of the tube body is oriented at an angle (A) of between about 25~ and 55~ with respect to a line (L2) orthogonal to the parallel sides (4a, b) of the plate (3). Such an angular mounting allows two or more tube assemblies of the invention to be arranged in a row which allows the plates of adjacent tube assemblies to engage one another, but does not allow contact between the elongated discharge ends of the tube bodies of the assemblies. This feature in turn allows a conventional tube changer to exchange one of the improved beaver-tail tube assemblies of the invention with another over a thin-slab casting mold without the need for spacers or modifications of the tube changer.

L'invention concerne un ensemble (30a, 30b) tube en queue de castor amélioré, que l'on peut changer facilement sur place au-dessus d'un moule (20) de coulée de brames minces au moyen d'un changeur (22) de tube classique. L'ensemble tube comprend une plaque rectangulaire (3) et un corps (7) de tube. Ce dernier présente une extrémité supérieure circulaire fixée sur un orifice de la plaque, qui reçoit le métal fondu, et une extrémité inférieure (15) allongée dans le sens de la largeur, qui permet de décharger le métal fondu dans l'orifice allongé du moule de coulée de brames minces. Dans l'ensemble tube de l'invention, l'extrémité supérieure du corps du tube est fixée sur l'orifice de la plaque de façon que l'axe longitudinal de l'extrémité inférieure allongée du corps du tube forme un angle (A) compris entre 25 et 55· par rapport à une ligne (L2) perpendiculaire aux bords (4a, b) parallèles de la plaque (3). Ce montage angulaire permet de placer deux ou plusieurs ensembles tubes de l'invention les uns derrière les autres, et donc de mettre en contact les plaques des tubes adjacents sans mettre en contact les extrémités allongées de décharge des corps des tubes. Grâce à cette caractéristique, un changeur de tube classique peut échanger l'un des ensembles tubes en queue de castor de l'invention contre un autre au-dessus du moule de coulée de brames minces, sans qu'il soit nécessaire d'utiliser des dispositifs d'écartement ou de modifier ledit changeur.

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