Research On Synchronization Control System For Giant Forging Hydraulic Press And Its Robust Control

The giant forging hydraulic press is the core processing equipment which widely used in aviation, automobile, shipbuilding, electric power industry and other key components manufacturing, it is the important embodiment of a national defense industry’s and heavy machinery manufacturing’s level and ability. The giant forging hydraulic press has large inertia, big flow, load characteristics such as complex and changeable, in addition to the hydraulic system of nonlinear time-varying, and cylinder cross coupling movement, and the influence of the asymmetry of the die forgings produce torque to the eccentricity, resulting in the moving beam happened tilt in the running, thus affecting die forging a processing precision molding, even affect the safety of hydraulic press’s body and mould, therefore, moving beam of synchronous control has very important significance, this also is independent research must break the bottleneck.This paper closely combining the giant forging hydraulic press the practical application of synchronous control problems, in order to meet our country national defense, aerospace and other industrial for large drop forged components manufacturing high accuracy of the key requirements as the goal, the800MN die forging hydraulic press synchronous control system as the research object, the integrated use of fluid mechanics, modern control theory knowledge, on the basis of theoretical modeling, computer simulation and experimental research, to find out the influencing factors of synchronous control precision and puts forward the corresponding measures, to solve the traditional synchronous control system’s shortcomings such as the low control precision, slow dynamic response, real-time poor, weak anti-jamming ability, effectively improve the product processing precision, and realize the complicated manufacturing system smooth motion control technology of independent innovation, and further reached the international advanced level.The main research achievements are as follows:1. Taking the existing300MN die forging hydraulic machine synchronous control system for reference, according to the800MN die forging hydraulic machine synchronous control system characteristics, to design a new hydraulic synchronization control system.2. To precision manufacture the forging as the goal, based on hydraulic theory and dynamics theory, establishing the model of the synchronization control system when moving beam running, to provide the basis for the research synchronous control system control strategy. On this basis, the two kinds of schemes are compared through simulation, the simulation results show that the new design of800MN synchronous control system response characteristics is substantial improvement, the response speed and dynamic&static precision are a large improvement, it can meet our country aerospace, defense industry, metallurgy industry, energy power fields of large components to manufacture precision and internal performance of the proposed more and more high demand.3. To study the effect of the giant die forging hydraulic press synchronous control performance factor and puts forward the solving measures. Using of MARC software, analysis of the hydraulic press body stiffness on the performance of synchronous control effect; analysis of moving beam and the fit clearance between the guide column and synchronous control system provides the work pressure and back pressure in the pressure difference on the synchronization control performance influence. To provide reference for the giant die forging hydraulic press synchronous control system design and the application for control strategy.4. H∞robust control, based on disturbance observer robust control and adaptive fuzzy robust control in synchronous control system application were studied. The simulation results show that:the above control strategys can effectively solve the passive synchronization control problems with the multi-cylinder driven by a giant die forging hydraulic press, it has strong robustness, can completely suppress the parameter uncertainty, uncertainty of model of the system, can effectively restrain the disturbance caused by the dynamic error, achieve to the purpose of improving the stability of the synchronization control system and the dynamic accuracy. 5.Participate in researching and developing the315T hydraulic experiment platform, and conducted experiments to test.The experimental results show that, the results of the test and simulation are coincident with each other, which validates the correctness of the mathematical model of the system, and it is proved that the proposed control strategy is effective and intelligent.