【作者】 刘秀军；

【导师】 吴晓明；

【作者基本信息】 燕山大学 ， 机械电子工程， 2009， 硕士

【摘要】 板带的厚度精度是其一个重要的质量指标。轧机的仿真技术研究对优化过程控制模型,改善生产工艺特性具有重要的意义。为了提高带钢的厚度精度,对轧机厚度自动控制系统进行了仿真。本文结合1420冷轧机组设备,对液压AGC系统进行仿真,建立机电液一体化模型,并与其它子系统的仿真模型联合而构成了完整的轧机设备仿真平台。本项研究在国家科技支撑计划项目“大型轧机共性技术的研究”的资助下完成的。本文针对仿真平台下的轧机机电液一体化模型进行了深入的研究,从液压系统,机械系统,轧制工艺和控制策略等方面进行了全面而系统地分析,进一步完善了现有的液压AGC系统数学模型。文中综合考虑了轧机辊系变形,压下缸初始行程,管道,轧辊磨损,轧件的塑性变形以及来料变化对板厚精度的影响,并考虑了液压控制系统的动态特性,建立了冷连轧机组的机、电、液一体化模型。在轧机辊系的建模时,将上、下辊系简化为一个两自由度弹簧质量系统,与以往的单自由度体系模型相比,更符合轧机的实际工况。基于位置闭环模型和轧制力闭环模型,分析了伺服阀、液压缸、管道等液压关键元件及性能参数对液压AGC系统的动态响应和稳态精度的影响。最后,利用燕山大学300四辊实验轧机进行对比性实验,验证理论模型,为优化控制策略以提高系统性能奠定基础。更多还原

【Abstract】 The thickness accuracy of strip is one of the most important quality indexes. The cold continuous rolling mill’s simulation research has important significance for both optimizing process control model and improving processing characteristics. In order to improve strip’s accuracy, it’s important to simulate the automatic gauge control system of the strip rolling mill. Based on 1420mm cold continuous rolling mill, this dissertation presents simulation model of its hydraulic AGC system, and establishes mechanical- electrical-hydraulic model. The simulation model, cooperated with other subsystems, constructs the complete simulation platform for rolling mill.This research is completed, under the financial aid of the National Science-technology Support Plan Projects“The common technology of large- scale mill”. The dissertation researches in-depth on the mechatronic model of simulation platform, to analyze and simulate the system from the aspects of rolling mill practice and control strategy, to improve the hydraulic AGC systemic mathematical model.Considering such factors as deformation and eccentricity of roller, the initial position of hydraulic cylinder, the plastic deformation of the strip and input gauge, as well as their effects on the thickness accuracy, and considering dynamic performances of hydraulic control systems, and establishes the mechanical- electrical-hydraulic model of rolling mill. In the course of building model, roll system is simplified as a two-DOF string mass system, which is more accord with practical conditions than the one-DOF system. Base on the position closed-loop model and rolling force closed-loop model, the dissertation separately analyzes the performance parameters of fluid power key elements such as servo valve, cylinder, pipe and its influence on hydraulic AGC systemic dynamic response and steady state accuracy. At last, to improve control strategy by verifying the theoretical model based on the Yanshan University 300 four-high mill experiment.更多还原