Based On Fuzzy CMAC With PID Compound Controller’s DMK-240Vacuum Sintering Furnace Control System Research And Development

At present our country is the world’s largest cemented carbide production and consumer, but domestic high quality cemented carbide for production sintering furnace mainly rely on import, and foreign equipment company the key technology is secrecy and the equipment price is too high, constrain the China’s cemented carbide the development of industry. Therefore, independent research and high performance sintering furnace equipment and complete set of advanced control system, to improve China’s cemented carbide product quality, improve the international competitiveness and realize the goal of saving energy and reducing consumption has important application value.Cemented carbide sintering is cemented carbide production of the key working procedure, cemented carbide product the quality depends on the control precision of sintering temperature, vacuum sintering furnace is cemented carbide sintering the key equipment. For vacuum sintering furnace sintering heating process to have big lags behind, big inertia, nonlinear and controlled object changes with time (every time sintering with the weight of materials, the size of the products and sintering process are random changes) properties, such as the use of the traditional control methods are hard to meet the high quality cemented carbide products production requirements. In participation in zhu_zhou cemented carbide group Co., LTD.’DMK-240vacuum sintering furnace control system development’ project development and debugging basis, taking the temperature as the main controlled parameter, for the controlled object model research, and through the open loop experiment measuring temperature point more than the going step response curve data, applying step response system identification method for the controlled object mathematical model and parameters of the approximate range (global range parameter change is big, local area parameters change small). To achieve the optimal control effect, proposes using piecewise approximation or with local generalization ability to implement the control temperature control algorithm, through to research based on the controlled object’s the fuzzy cerebellum model articulation controller (FCMAC) and the algorithm, designed the composite based on FCMAC with PID temperature controller. Finally, using the MATLAB software system simulation, the simulation results show that the composite based on the FCMAC with PID temperature controller in inhibiting overshoots and response speed and stability, are better than the traditional PID controller.Through to the vacuum sintering furnace equipment and sintering process of thorough research, based on the furnace equipment from Sweden’s Sandvik group company imported DMK-240vacuum sintering furnace, designed a control system based on PLC master controller and industrial control calculation unit state monitoring, After a production workshop nearly two years of production running, from industrial process database to intercept part history process curve of the data analysis. The results show that the composite based on the FCMAC with PID temperature controllers applied in DMK-240vacuum sintering furnace temperature control, in high control accuracy, stable performance is good, can well meet the modern cemented carbide vacuum sintering furnace temperature control process requirements.