【作者】 郭振宇；

【导师】 杜凤山；

【作者基本信息】 燕山大学 ， 机械设计及理论， 2004， 硕士

【摘要】 工作辊的热辊型作为板形理论的重要内容之一，因其影响因素繁多，边界条件复杂，一直是板形研究和控制领域里的薄弱环节。因此对其展开研究，具有重要的理论和实际意义。本文系统研究了工作辊热辊型动态形成机理，建立了计算轧辊温度场和热凸度的仿真模型。确定了轧辊温度场仿真所需的传热学方程及边界条件。详细分析了轧辊热流输入输出关系及特征，讨论了热流载荷的简化计算问题，给出了喷水冷却，轧制升温，接触传热系数的计算公式。采用有限元方法对70MN强力高刚度轧机的工作辊热辊型进行了仿真计算，得出了达到热平衡后工作辊内部温度场分布规律，热凸度变化的历史曲线，并对该轧机实际工况下的热辊型进行了预报。为了真实地反映实际辊缝形状，对辊系弹性变形也进行有限元仿真，给出了辊系的弹性变形规律，并将热变形与弹性变形进行了叠加，求出最终辊型曲线。通用有限元软件计算精度高，但需专业人员建模调试而且有限元本身有耗费机时多的缺点。针对以上问题，本文以MATLAB软件为开发平台，以有限差分法和影响函数法为计算方法，应用面向对象编程技术，编写了70MN强力高刚度轧机的专用可视化仿真软件。该软件操作简单方便，可扩展性强。并将该软件计算结果与有限元计算结果进行了对比，验证了该软件的计算精度。更多还原

【Abstract】 The research of work roll thermal profile,as one of the important area of strip shape control theory,is the vulnerable spots because of both the complicated boundary condition and numerous effect factors.So the reseach of thermal profile has the important value of the theory and practice.In this paper , the dynamic forming process mechanism of thermal profile of work roll has been studied systematically , and the simulation model of temperature field and thermal crown has been developed during rolling sheet and strip. At the same time,the heat transfer equation and the boundary conditions, which is needed for temperature field simulation, has been determined. The relation and features of heat flow into and out of rolls are analyzed in detail , simplified theory and method of heat flow calculation are discussed. The formula of spray, temperature rise caused by plastic deformation, roll bite heat transfer coefficient has been summarized .The work roll’ thermal profile of 70MN stiff mill has been calculated with FEA,the temperature field and Variety of thermal crown and the thermal profile in work condition has been predicted . The Elastic deformation of roll system has been calculated , and the finally profile of roll has been obtained .Current FEA software is precise,but the modeling and debugging need professional man,further more FEA need more time.So a special software is made for 70MN stiff mill in Matlab language . In this software the finite difference method,influence function method and Object-brientated technology has been used . The software can be used easily , and can be expanded .The result of the software contrast with the result of FEA , proving that the precision of the software is high enough for engineering.更多还原