| The research subject is about the design, the simulation and prediction of the hydraulic control system of a whole-fiber Crankshaft Hydraulic Press. The essential problems are the synchronization between the two horizontal cylinder groups and the coordination of the vertical bending cylinder with horizontal cylinders。Based on the functions, actions and the main body structure specifications of the press, the principium design of the hydraulic system of the press is carried out. Based on the analysis of the characteristic of the machine,its application condition and applicability comparison among various hydraulic systems and components available, the design of the synchronization control and the action coordination control of vertical bending cylinder with horizontal upsetting cylinder groups are finished.The simulation software, AMEsim is used for modeling and simulating the two systems. Focusing on the opposite synchronization of the two horizontal upsetting cylinder groups, about the"Parallel PID Control"and"Principal–subordinate PID Control", the variation of synchronization error with PID parameters is studied, the PID parameter feasible zones of without-load for the two systems are established respectively, the feasible zones are verified for feasibility to with-load condition. The variation of the coordination error of bending cylinder with upsetting cylinder groups with the Principal–subordinate PID Control is investigated and analyzed.The feasible zones can supply reference to design of the system and its adjustment on set. The research results show that: the designed control system is suit for the synchronization control of the horizontal cylinder groups and the coordination control of the vertical bending cylinder with the horizontal cylinder groups, and that both the"Principal–subordinate PID Control"and the "Equivalent PID Control"are suitable for the system and the previous one is better.
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