Casting of molten metal in an open ended mold cavity

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 11/04 (2006.01) B22D 11/049 (2006.01) B22D 11/07 (2006.01) B22D 11/08 (2006.01) B22D 11/124 (2006.01)

Patent

CA 2309043

When a body of startup material (70) has been interposed in the cavity (4) between the starter block (60) and a first cross-sectional plane (72) of the cavity transverse the axis (12) thereof, the starter block has commenced reciprocating along the axis, and the body of startup material has commenced reciprocating in tandem with it, through a series of second cross-sectional planes (74), layers (76) of molten metal are successively superimposed on the body of startup material adjacent the first cross-sectional plane of the cavity, and the layers promptly distend relatively periperally outwardly from the axis under the inherent splaying forces therein. The invention confines the relatively peripheral outward distention of layers with a casting surface (62) which is peripherally outwardly flared about the axis of the cavity, so that the thermal contraction forces arising in each layer can counterbalance the splaying forces.

Lorsqu'un corps d'une matière de démarrage (70) est interposé dans la cavité (4) entre le bloc de démarrage (60) et un premier plan transversal (72) de la cavité perpendiculaire à l'axe (12) de cette dernière, et lorsque le bloc de démarrage a commencé un mouvement alternatif le long de cet axe en tandem avec le mouvement alternatif du corps de la matière de démarrage à travers une série de plans transversaux (74), des couches (76) de métal fondu sont successivement superposées sur le corps de la matière de démarrage de manière adjacente au premier plan transversal de la cavité, et ces couches sont distendues rapidement et s'éloignent de l'axe relativement vers l'extérieur et la périphérie, sous l'effet des forces propres d'abrasement qui s'y exercent. Le procédé de l'invention circonscrit la distention relative des couches vers l'extérieur et la périphérie au moyen d'une surface de moulage (62) évasée vers le bord extérieur autour de l'axe de la cavité, si bien que les forces de contraction thermique exercées par chaque couche peuvent contrebalancer les forces d'abrasement.

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