| The innovation of science and technology promotes the rapid development of theforging industry. From the hand-forging in ancient times to the automated-forgingmachines at present, the production efficiency has been greatly improved, but on thecontrary the quality and precision of product has declined. Hydraulic press relies onthe hydraulic cylinder to drive the moving crossbeam to forge the workpieces, thelevel accuracy of moving crossbeam is an important target of the quality of forgingproducts. However, with the constantly improvement of industrial demanding, thetonnage of hydraulic press and the forging platform is becoming bigger and bigger,and always needs multiple actuators to drive the forging platform at the same time,adopts the method of synchronization driving control by multiple hydraulic cylindersto control the balance of the moving crossbeam. Hydraulic synchronous control canguarantee a better level precision of moving crossbeam, and improve the quality offorging products, so it was widespread used in industrial areas.This paper researched on a controlling scheme of synchronous driving with multi-cylinder about hydraulic servo press, which combined with the practical project of2500T forging hydraulic press. The moving crossbeam of this forging hydraulic presswas driven by five hydraulic cylinders at the same time, which in order to realize thesynchronous forging of multi-station. Because of the influence of different forgingdeformation force for every workpiece at each station, the forging moving crossbeamwould be able to tilt, and affected the forging quality and the service life of equipment.In this Study, four digital valves were adopted to complete the fine-tuning for foursynchronous cylinders in the final press process, and then achieved the balance controlfor moving crossbeam.Aiming at the synchronous balance control of the crossbeam corners of hydraulicpress, the paper first designed the hydraulic system of this multi-cylinder synchronousdriving control scheme, introduced the working principle of synchronous control of hydraulic system, introduced the working principle of the digital valve by servo motordrive and proposed the method of real-time detection for quadrilateral displacement ofmoving crossbeam. Second, it established the mathematical model of digital valvecontrolled hydraulic cylinder system with analytical methods, deduced the functionalrelationship between hydraulic cylinder’s flow or displacement and digital valve’s gaplength, and did a simulation to the synchronous control hydraulic system by using thesoftware AMESim. Finally, it built an experimental platform for digital valvecontrolled hydraulic cylinder system, carried on the field experimentation, analyzedand compared the experimental results and the simulation results. This article alsoprovides a few reference points for the future research on synchronous controltechnology with multi-cylinders for hydraulic press. |
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