Injection Molding Machine Computer Control System

According to the tendency of modern plastic injection machine with high productivity and larger clamping force, the controller for the machine must has good automatic control performance with friendly human-machine interface.Aiming at the actuality in the field of the plastic injection machine controller, A controller based on 80196KC single chip microprocessor with LCD screen is developed. After this, several temperature control strategies for barrel of extruder are studied, the real time control results are presented, and the feasibility of the realization of different control strategies is discussed.This thesis consists of six sections:In the first section, the author briefly review the development, the actuality and the tendency of PIM (plastic injection machine) . Later electronic and temperature control system are introduced. At last, the content and study strategies of this thesis are briefly introduced.In the second section, firstly the control system technical constitute, hardware structure and software development are introduced. At last, hardware and software anti-jamming actions are discussed.In the third section, the PID and fuzzy control method are discussed. Firstly the PWM implementation of relay is given. In succession the characteristic of extruder barrel is obtained by measuring their step response. At last the implementation of PID and fuzzy control are studied in detail and the results of the experiment are presented.In the forth section, the Dynamic Matrix Control strategy is discussed. Firstly the principles of predictive control are introduced. Later, Multi-variable Dynamic Matrix Control Algorithm is put in practice on the decoupling control of extruder barrel.In the fifth section, the Generalized Predictive Control strategy is discussed at first. After that, the author applies the Generalized Predictive Control Algorithm to the real-time control of extruder barrel.The last section is a summary of the whole research work. The main achievements of this thesis are mentioned and the conceit of the further developing work is pointed out.