Adaptive controller for injection molding

Details Adaptive controller for injection molding Adaptive controller for injection molding

B - Operations, Transporting

29

C

B29C 45/77 (2006.01) B29C 45/82 (2006.01)

Patent

CA 2233877

An adaptive controller (42) is provided for controlling the transition, in an injection molding apparatus (10), from the injection stage to the packing stage. The controller operates by controlling the velocity of the ram (32) during the injection stage, and controlling the ram pressure during the packing stage. The controller (42) anticipates the transition from the injection stage to the packing stage by monitoring the ratio of pressure to velocity. The divergence of this ratio forecasts the onset of the packing stage. At this time, a pressure relief valve (46) is preset in anticipation of the packing stage, to prevent a pressure spike during the transition period. The flow control valve (40) is held constant during the transition.

Dispositif de commande adaptatif (42) servant à commander la transition, dans une machine de moulage par injection (10), depuis l'étape d'injection jusqu'à l'étape de compactage. Ce dispositif commande la vitesse du mandrin (32) pendant l'étape d'injection, ainsi que la pression dudit mandrin pendant l'étape de compactage. Ce dispositif de commande (42) anticipe la transition depuis l'étape d'injection jusqu'à l'étape de compactage en contrôlant le rapport entre la pression et la vitesse. La divergence de ce rapport annonce le commencement de l'étape de compactage. A ce moment, une soupape de sûreté (46) est réglée préalablement à l'étape de compactage, afin d'empêcher une pointe de pression pendant la période de transition. La soupape de régulation de débit (40) est maintenue constante pendant la transition.

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