Abstract
THERMOPLASTICS INJECTION MOLDING MACHINE CONTROL, PART I: MOLD TEMPERATURE CONTROL USING I-PD COMPENSATOR, PD-PI AND 2DOF-2 CONTROLLERS COMPARED WITH A PID CONTROLLER
Prof. Dr. Galal Ali Hassaan*
ABSTRACT
The control of mold temperature in injection molding machines is essential to maintain production of molded plastic parts with good quality and minimum defects. The paper presents the control of mold temperature using a compensator from the second generation of control compensators (I-PD) and two controllers from the second generation of PID controllers (PD-PI and 2DOF-2). A proper tuning technique is selected to tune the compensator/controllers using an ITAE performance index. The step time response of the control system using the three proposed compensator/controllers is presented and compared with using a PID controller to control the same mold temperature andthe time-based characteristics are compared. The comparison reveals the best compensator/controller among the four compensator/controllers depending on a graphical and quantitative comparison study.
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