Modeling And Simulation Of Tube Rolling Mill Hydraulic Screw Down System

Entering the21st century, seamless steel pipe production increased year by year,5%substandard products in the actual production process，which need to be demoted, reducedprices, and even some of the products will be re-melted, the main reason is the seamlesssteel pipe wall thickness longitudinal unevenness. Seamless steel pipe general need todowngrade, lower prices, and even the new recycled when the uneven in vertical appear,resulting in significant economic losses to the Seamless Steel Tube Plant.In this paper, we treat a seamless steel pipe plant MPM hydraulic HCCS system as thestudy object. HCCS is Hydraulic Capsule Control System, which is Ogura hydrauliccontrol technology. Hydraulic pressure system what is the execution system of hydraulicHCCS system make the pressure cylinder real-time accurate arrive at the designatedlocation in accordance with the instructions, so as to control the roll gap. Asymmetric servovalve control cylinder as a core part of hydraulic pressure system, its static and dynamiccharacteristics have a direct impact on the amount of pressure to the hydraulic cylinder.According to components of MPM hydraulic pressure system, established a mathematicalmodel of the hydraulic HCCS system, focused on the dynamic characteristic analysis of theservo valve, hydraulic cylinder, displacement sensors, control regulator, and other control,testing components. Then paper established dynamic model of the hydraulic pressuresystem closed-loop system. Used the basic elements modeling method of AMESimsoftware, established electro-hydraulic position control system simulation model with thismethod. Analyzed the affect of dynamic characteristics of the hydraulic pressure systemwith the leakage coefficient of the hydraulic cylinder, hydraulic key component parameters,such as the natural frequency of the servo valve. And researched the pipe dynamiccharacteristics between the servo valve and hydraulic cylinder, analyzed influence ofpipeline length and diameter parameters of hydraulic pressure system; the double cylindercontrolled by the master-slave control strategy, focusing on the analysis the effect ofsystem-cylinder displacement sync output in differentK pvalues of PID controller. Simulation results show that the components of the system have impact on hydrauliccylinder pressure volume impact. The rational allocation of system component parametershelps to improve system rapid responsiveness and control system for response accuracy.In rolling process, parameter perturbation, nonlinear, outside interference and otherfactors is vulnerable to the hydraulic pressure system, to establish their precisemathematical model is very difficult. Put intelligent controller into the field of rollingsolves this problem. Used the AMESim own design and development module, and selectedgenetic algorithm to optimize the PID parameters. Being based on AMESim/Simulinkco-simulation platform, used the advantages of between the fuzzy control algorithm that isflexible and fast, does not rely on an accurate model, and the traditional PID controlalgorithm that has high precision. Combined fuzzy control algorithm with the traditionalPID control algorithm, Fuzzy PID controller is designed to achieve a system of intelligentcontrol. This paper made comparative Analysis of controlling effect with conventional PIDcontroller and fuzzy PID In the absence of interference, interference both cases. Thesimulation results show that the fuzzy PID controller was slightly better than the traditionalPID controller.This paper research on response speed and stability of hydraulic pressure system, canprovide some guidance for the production sites, also has a positive impact on improvingindustrial production.