Method for controlling an injection moulding press

B - Operations – Transporting – 29 – C

Patent

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B29C 45/76 (2006.01) B29C 45/77 (2006.01)

Patent

CA 2231042

A method for controlling an injection moulding press, wherein the injection process is controlled by controlling the injection force, is disclosed. According to the method, the mass (m) of a moulded product is correlated with the viscosity ( eta ) and either the pressure (Pm) of the material in the mould or the injection pressure (Ph), the resulting correlations are processed to define an analytical model expressing the mass (m) of the moulded product in relation to the operating parameters, an injection force control law is derived from said analytical model on the basis either of the pressure (Pm) of the material in the mould or of the injection pressure (Ph), and the press injection force is controlled on the basis of said analytical model.

La présente invention concerne un procédé de commande et de régulation d'une presse de moulage par injection, dans lequel on contrôle l'opération d'injection par le contrôle de la force d'injection. Ce procédé est caractérisé en ce qu'il comporte les étapes consistant à établir des corrélations entre la masse (m) d'un produit moulé avec la viscosité (.eta.) et, soit la pression (Pm) de la matière dans le moule, soit la pression d'injection (Ph), effectuer un traitement de ces corrélations, afin de définir un modèle analytique exprimant la masse (m) du produit moulé en fonction des paramètres de fonctionnement, déduire de ce modèle analytique une loi de commande de la force d'injection en fonction, soit de la pression (Pm) de la matière dans le moule, soit de la pression d'injection (Ph), commander la force d'injection de la presse à partir de ce modèle analytique.

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