Research on hydraulic beam drive and Position control System of large die forging

High-precision large die forging is a key part in aircraft manufacturing and aerospace industry production. Heavy precision die forging hydraulic press is the key equipment to ensure the quality of these die forging parts. The precision of its moving beam drive and position control system directly determines the quality of die forging parts. Large die forging hydraulic press has the characteristics of high pressure, large flow, multi-point parallel drive and large inertia. The system will cause overshoot oscillation and strong impact in the fast movement of large inertia and large stroke, and reduce the dynamic accuracy and stability of the movement. In order to achieve high-precision position control and improve the overall working ability of equipment, this paper takes the moving beam drive and position control system as the research object, and studies its control mechanism, overall control scheme and control strategy. The main research contents of this paper are as follows:

(1) Analyze the status quo and development of domestic and foreign hydraulic press control technology and control system research, and put forward the overall plan of moving beam drive and position control. The whole system is composed of three parts: driving hydraulic system, position detection system and electrical control system. Based on the bus technology, the distributed two-stage calculating maneuver beam position control system and the upper computer monitoring system are constructed.

(2) Taking the hydraulic drive system and moving beam of die forging hydraulic press as the object, the mathematical model is analyzed and studied. On the basis of considering the influence factors of fluid compressibility, viscous resistance, leakage and so on, the dynamic model of the movable beam driving system was established. The mathematical model block diagram of the system was obtained by the method of transfer function, and the parameters of the system model were determined. By analyzing the influence of three parameters of PID controller on the static and dynamic performance of the system and the fuzzy control theory, the fuzzy adaptive PID controller is designed, and the method of its realization is studied emphatically. The fuzzy logic toolbox in MATLAB and simulink are used to compare and analyze the PID control and fuzzy adaptive PID control algorithm.

(3) The design of the control platform is completed, and the fuzzy adaptive PID intelligent control algorithm is realized by PLC. The topological structure and multi-windows hierarchical monitoring system of upper computer is designed and developed by WinCC configuration software, and the position control system of die forging hydraulic maneuver beam is realized.

(4) The commissioning of the die forging hydraulic press test platform was completed. Compare and analyze the control effect of different control strategies under the same working conditions and the same control strategy under different working conditions. The research shows that the system adopts fuzzy adaptive PID controller, which has fast response speed and high precision of position control, which is obviously superior to PID controller. The control effect of moving beam at low speed is better than that at high speed, and the control accuracy of moving beam position is 0.1-0. 2 mm.

this is good forgings produced by tongxin precision forging company