Abstract
This paper describes an improvement into a temperature control of a heating cylinder of an injection moulding machine. Resin is molten by band heaters through a thick layer in the heating cylinder, and the temperature of the resin is controlled precisely in the heating and melting process. The heating process is modeled as an interactive system, which is composed of a sequential heating process. The heat flow among the heating processes is compensated by a decoupling method and the control system is designed in each decoupled process independently, considering irreversible thermal characteristics of the resin. A lumped parameter model of the heating cylinder is obtained by means of a finite element method and the design margin of the control system is expressed as Gershgorin band. On the other hand, molten resin flow and a frictional heat are generated by a screw revolution intermittently in the heating cylinder. The intermittent process is modeled as a sampling system and a control design margin is obtained experimentally. The effect of the new control method is verified by experiments in conclusion. This study is applicable to other similar distributed parameter systems and intermittent processes as a general analysis and control method.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
