Method for controlling a vacuum valve of a vacuum diecasting...

B - Operations – Transporting – 22 – D

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Details

B22D 17/14 (2006.01) B22D 17/32 (2006.01)

Patent

CA 2460195

The invention relates to a vacuum diecasting device that comprises a casting cavity (10) which can be evacuated via a vacuum valve (26) and into which a liquid casting material can be pressed by a piston (14) that is actuated by an actuator (17). The device further comprises a level sensor (20) for detecting a level of the casting material in the casting cavity, a control device (34), linked with the level sensor, for controlling the vacuum valve, and a position sensor (32), linked with the control device (34), for detecting the movement of the piston (14). The control device produces a close signal for the vacuum valve (26) when the piston, once position (s1) is reached, at which the level sensor (20) indicates a predetermined level of the casting material in the casting cavity (10), has been displaced in a predetermined manner.

L'invention concerne un dispositif de moulage sous vide comportant une cavité de moulage (10) pouvant être vidée au moyen d'une soupape à vide (26) et dans laquelle un matériau de moulage liquide peut être comprimé au moyen d'un actionneur (17) actionné par un piston (14). Le dispositif selon l'invention est par ailleurs composé d'un capteur de niveau de remplissage (20) destiné à relever le niveau de remplissage de matériau de moulage dans la cavité de moulage, d'un appareil de commande (34) relié au capteur de niveau de remplissage, destiné à commander la soupape à vide, et d'un capteur de position (32) relié à l'appareil de commande (34), destiné à relever le mouvement du piston (14). L'appareil de commande produit un signal de fermeture pour la soupape à vide (26) lorsque le piston est déplacé de manière prédéfinie après atteinte de la position (s¿1?) dans laquelle le capteur de niveau de remplissage (20) indique un niveau de remplissage prédéfini de la cavité de moulage (10).

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