Simulation And Research Of Double Hydraulic Cylinder Synchronization Control System On Four-column Hydraulic Press

Hydraulic press is one of mainly used in modern industrial production equipment, such as metal forming, stretching, cutting and extrusion, etc. So far, hydraulic press has been very common in the field of mechanical production, it greatly promote the rapid development of social economy. Because the demand for high precision and high quality makes the traditional hydraulic press machinery processing cannot meet the demand. Therefore development of high technology content of hydraulic press has been imperative. At present in terms of multi-cylinder synchronization control still is the research hotspot and difficulty of hydraulic press. Hydraulic press in the process of work if the load is not uniform, hydraulic system leakage, friction of the mechanical structure and manufacturing precision is not high etc. will cause a certain degree of deviation during multiple hydraulic cylinder in the process of movement, resulting in the activity crossbeam produce some inclines, it will affect the precision of the processing, even affects the service life of hydraulic press, So it is very important to research on hydraulic synchronous control system.On the basis of extensively reading literature which about the hydraulic press and the hydraulic cylinder synchronization control, discusses research status and development trend about hydraulic press and the hydraulic cylinder synchronization control technology at home and abroad, this paper puts forward in the research content and direction about four-column hydraulic press. Through researching and designing four-column hydraulic synchronous control system, will provide a theoretical basis about four-column hydraulic synchronous control system.This paper designs a four-column hydraulic press displacement synchronous control system, which use a kind of digital valve as the core of the throttle type synchronous control system, the synchronization system that is active hydraulic cylinder and driven hydraulic cylinder subsystems, the main idea of the synchronous control is to take the displacement signal of active hydraulic cylinder as the input signal of a driven hydraulic cylinder, by adjusting the control driven hydraulic cylinder to achieve two hydraulic cylinder synchronization operation.Because the four-column hydraulic synchronous control is a nonlinear time-varying systems. And during the four-column hydraulic press works process, the system pressure is high and flow rate change is big, therefore the oil pressure fluctuation is bigger in the pipeline, and four column hydraulic press control system requires high that the response speed and pressure stability of the oil. Therefore, designing a better oil source system for various properties of four column hydraulic press, especially improving the control accuracy is very beneficial. With the help of the AMESim simulation, the reason for the constrained synchronous movement and the modern industrial control of synchronous request of high precision, fast response, etc. The hydraulic system adds the proportional relief valve to control the stability of the control oil pressure. The oil pressure stability control and displacement synchronous control together constitute a kind of double loop control strategy. Both control adopts PID control which is one of the most classic industrial controls. Through the AMESim/Simulink for double four-post hydraulic synchronous control system joint simulation to verify its performance. The results show that the external interference to maintain a good stability, good tracking of the simulation curve and target curve, so this method has good control performance.