Injection molding is an extremely complex: time variant, non-linear process which places extremely high demands on screw injection velocity controlalgorithms. This batch molding process has the capability to produce ...
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Injection molding is an extremely complex: time variant, non-linear process which places extremely high demands on screw injection velocity controlalgorithms. This batch molding process has the capability to produce high added value products and represents the major polymer processing sector, with a diverse range of molded products. Adaptive velocity control forms an integral part of the Intelligent Process control (IPC) programme at Moldflow, where the requirement is for a self-tuning high performance velocity controller that can accommodate changing process dynamics, regardless of screw wear and tool geometry, the polymeric material being processed and the technology of the injection molding machine (IMM). This paper briefly describes the methodology of a universal adaptive controller for the control of ram velocity during the primary injection (filling) phase. Results of the controller performance are presented for both simple linear injection profiles and more complex stepped injection profiles. The response of the adaptive controller to ramp inputs will be reported in future publications. The controller performance has been verified, in terms of flexibility on several different IMM's, ranging from 100 to 550 tonnes. Performance was investigated and assessed in terms of coefficient variation derived from continuously monitored injection molding cycles.
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