Large Forging Hydraulic Motor Beam Drive And Position Control System

High-precision large-scale forging is the key parts of the aircraft manufacturing industry and aerospace industrial production, and heavy precise die forging hydraulic press is the key equipment to guarantee the quality of these die forgings, the accuracy of its moving beam's drive and position control system determines the quality of forging parts directly. Giant forging hydraulic press with a high pressure, big flow, multi-point parallel-driven, large inertia and other characteristics, system in the large inertia large travel fast movement will cause overshoot oscillation, having a strong impact in the system and reducing the movement of dynamic accuracy and working smoothly. This paper studied the drive and position control system of the hydraulic press, based on its control mechanism, Control of the overall program and control strategies, to achieve high-precision position control and improve the overall capacity of the actual equipment. In this paper, these main research works as following:(1) Based on analysis of present state and perspectives on control technology of these domestic and foreign giant die forging hydraulic press, and control system research also, the overall program of the drive and position control system was proposed. The system consists of three parts with drive hydraulic system, position detection systems and electrical control system, a position control system based on bus technique, Master-Slave Structure, distributed two computers system and the upper computer monitoring and controlling system was put forward.(2) Mathematical model was researched on hydraulic drive system and moving beam of forging hydraulic press. Based on Compressibility, viscosity resistance, leakage of the fluid, dynamics equation of moving beam was established. These hydraulic-mechanical dynamics models of drive system for the moving beam were established by transfer function method, the system model parameters were determined. Design the fuzzy self-adaptive PID controller and research its implementing method, based on analyzing the fuzzy control theory and the influence of three parameters upon the system static state and the dynamic state function. Analysised PID control and fuzzy self-adaptive PID control algorithm by using the fuzzy logic toolbox in matlab and simulink together.(3) Completed the control platform design and achieved the fuzzy adaptive PID intelligent control algorithm by PLC, with WinCC configuration software, an upper computer monitoring and controlling system based on topology network structure, multi—window, grading man-machine interface was developed, the position control of the die forging hydraulic press was developed.(4) Completed the test platform of die forging hydraulic press to build and debugging. Analysised the control effect with different control strategies with the kinds of operating conditions and with the kinds of control strategies in the different conditions. The tests prove that the system using fuzzy adaptive PID controller has high precision, fast response, and clearly superior to PID controller, the moving beam control effect of low-speed is better than the high-speed operation, the position control accuracy is 0.1-0.2mm.