| 800MN giant forging hydraulic press is mainly used to produce metal precision forgings such as a variety of large-scale steel with low plasticity and high strength, heat-resistant steel, carbon steel, low-alloy steel and so on. It's a important and basic equipment for the production of large-scale forging parts in the fields of aviation, ships, aerospace, weapons, power and nuclear industry. The hydraulic system of the machine has the features of ultra high pressure, large flow, large speed regulating range, high control precision. Its activities beam is connected with the machine frame through 15 different kinds of hydraulic cylinders, which constitutes a highly complicated coupling relationship between the parameters of the composition of the coupling relationship between the various parameters of the mechanical, electrical and hydraulic system. The stability, rapidity, accuracy, synchronization and deviation correction ability of hydraulic system directly affect the performance of the press and the quality of products. Therefore, it is necessary to carry out the research on the control principle, the dynamic response characteristics of the activities beam and the synchronous control strategies of the press' s hydraulic system.According to the technical requirements and the design of technical indicators of 800 MN forging hydraulic press, the hydraulic main drive system is studied first. On the basis of deep analysis and synthesis of the current large press technology, modern hydraulic technology and intelligent control technology, the strategy of five hydraulic cylinder drived by five hydraulic pump station respectively and collaborative control of the main hydraulic driven is developed, the method of five main drive cylinder adopt Active synchronization control is proposed. Then Simulink was used to analyze the building pressure of the corrected system's working-cylinder. Input the time, load, speed of the beam, obtained the dynamic process which used the angle of vertical deflection of beam around the working cylinder center diagonal as output.Secondly, the analysis and Research on the up-five and down-four hydraulic cylinder's complex system which directly affect the moving position of the activities beam is studied. A hybrid synchronization control strategy of Active synchronization and Passive leveling act synergistically on activities beam is proposed at the first time. And the complex system of the hydraulic cylinder is analyzed, the dynamic model of the hydraulic machine main passive hybrid synchronization system is established, the influence of the bias load torque and the deviation angle of the moving beam is analyzed; through Adams and AMESim co-simulation on synchronization system, hybrid synchronization curve under different conditions are obtained. The simulation results show that the system has good control performance.Thirdly, the intelligent control strategy of multi cylinder complex hydraulic synchronization system is summarized, and based on the characteristics of the 800 MN hydraulic press system, a model reference adaptive control strategy is proposed. Through the whole digital simulation of the system, it is found that the model reference adaptive control strategy has better response speed and dynamic performance than the common PID control. The simulation results also show that the hybrid synchronization control system can achieve synchronous speed and position deviation control and the synchronization error is fully meet the design requirements.Finally, the experimental prototype of multi cylinder complex hydraulic hybrid synchronization strategy is developed, and thorough experimental study is carried out, the experimental results and simulation results are consistent. Hybrid synchronization control strategy and corresponding intelligent control algorithm is applied on the 800 MN giant forging hydraulic press, commissioning and acceptance results show that the strategy has good position control precision and synchronous rectification precision, verifying the correctness of main hydraulic drive system design and multi cylinder complex hydraulic hybrid synchronization strategy, which provides the theory basis for similar giant forging hydraulic press' s main drive system design and multi cylinder complex hydraulic hybrid synchronization system design. That shows the contents of this paper has important theoretical value and practical significance. |
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