Injection Molding Machine Temperature Control System Algorithm Research And Realization

Precision plastic products use more and more widely in the electronics, medical, automotive and other industrial applications. For producing precision plastic products, For producing precision plastic products, injection molding machine manufacturers in our country pay more attention in the development of mechanical parts, pay less effort in the injection molding machine control system. Injection molding machine control systems are mostly used in Austria KEBA other third-party products that do not have independent intellectual property rights, high prices and sometimes difficult to adapt to the requirements of precision injection molding. Develop domestic injection molding machine controller and advanced control methods, achieve precision injection molding, will help improve the level of injection molding machine control technology and make domestic injection molding machine more competitive in the interna tional market.Based on advanced Control and Modeling Laboratory cooperate with Guangdong Zheng Mao company developing injection molding machine controller project, It require the injection molding machine controller can achieve precise control of multiple parameters such as temperature, pressure, velocity, etc.to this end, select the temperature control as the study points and Zheng Mao company developed two direct compression plate precision injection molding machine as control target, research the injection molding machine temperature control system algorithm and improve the accuracy of the temperature control of injection molding machines. By looking at the domestic and foreign related literature about injection molding machine temperature control algorithm, the temperature control algorithm research status of injection molding machine has a deep understanding, and do the following work :(1) Analysis of the injection molding machine sol process and temperature characteristics, using the step response iden tification modeling method, established to consider interference between adjacent sections of the transfer function matrix mathematical model of the temperature of the injection molding machine.(2) When the temperature setting is changed, the injection mo lding machine fixed parameter PID temperature control the presence of an unstable steady-state error, using the control algorithm based on the expertise of its segment PID improved, and build a simulation system, simulation results showed steady-state error can be controlled within the receiving range.(3) Generalized predictive control injection molding machine temperatures are present computationally intensive, requiring high computing speed controller deficiencies, implicit generalized predictive control the amount of feedback control before control algorithm has been improved through the simulation, injection molding machine temperature steady-state error accuracy within ± 0.5 ℃, showed an implicit generalized predictive control injection molding machine temperature control algorithm is effective and superior performance.(4) Taking into account the purchase of laboratory not yet in place and injection molding machine temperature control algorithm may damage the traditional test method has shortcomings of current machines, based on NI RIO9623 STM32 control and data acquisition card built injection molding machine temperature control algorithm HIL test platform and dynamic correlation analysis to verify the credibility of the mathematical model. Finally Implicit Generalized Predictive Temperature Control System for MIMO injec tion molding machine control algorithm test results show that the algorithm is superior control performance, the steady-state error is within ± 1 ℃..