VERFAHREN UND EINRICHTUNG ZUR REGELUNG DES SPRITZGIESSPROZESSES.

摘要

Regulating the injection moulding process in a hydraulic injection moulding machine, involving switch over from injection to holding pressure as the flow rate (Q) is suddenly reduced, utilises a pressure-measuring unit for the pressure (P). The period between the instant at which injection flow rate changes to holding flow rate and the instant at which a predetermined pressure or the resultant change in pressure is reached, or an associated signal, or alternatively the period between the first time a predetermined pressure is reached as the flow rate is reduced and the second time this same or another preselected pressure is reached, are determined; alternatively the stroke of the injection piston at the instant of flow reduction is measured. The change in the piston stroke until the time when a predetermined pressure or the pressure before reduction in flow is reached, or the pressure difference value between maximum pressure at flow reduction and minimum pressure after this reduction is determined; these are used as comparison variables for regulating the process.