Dynamic Modeling and Control of Packing Pressure in Injection Molding

[+] Author and Article Information
J. Hu, J. H. Vogel

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

J. Eng. Mater. Technol 116(2), 244-249 (Apr 01, 1994) (6 pages) doi:10.1115/1.2904280 History: Received May 19, 1993; Online April 29, 2008


A dynamic model of injection molding developed from physical considerations is used to select PID gains for pressure control during the packing phase of thermo-plastic injection molding. The relative importance of various aspects of the model and values for particular physical parameters were identified experimentally. The controller gains were chosen by pole-zero cancellation and root-locus methods, resulting in good control performance. Both open and closed-loop system responses were predicted and verified, with good overall agreement.

Copyright © 1994 by The American Society of Mechanical Engineers
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