平整过程中异步轧制轧制压力计算模型  

Calculation model of asynchronous rolling pressure during flattening process

作　　者：张孝彦 张冀 王卓[1] 白硕 白振华[1,2] ZHANG Xiaoyan;ZHANG Ji;WANG Zhuo;BAI Shuo;BAI Zhenhua(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,Hebei,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China)

机构地区：[1]燕山大学国家平整板带装备及工艺工程技术研究中心,河北秦皇岛066004 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《钢铁》2024年第1期108-116,共9页Iron and Steel

基　　金：河北省高等学校科学技术研究资助项目(CXY2023012);河北省重大科技成果转化专项资助项目(22281001Z);辽宁省教育厅高等学校基本资助项目(LJKZZ20220040)。

摘　　要：平整过程中由于带钢下表面平整液滴落导致带钢出现上下表面摩擦因数不同的异步轧制现象,使用平整过程的轧制压力模型预报平整异步轧制过程中的轧制压力时精度不高。为此,针对普通工程适用的平整轧制压力模型计算平整异步轧制轧制压力误差较大的问题,提出适用于异步轧制的轧制压力计算方法。考虑到异步轧制的工艺特点与设备的实际工况,首先分析带钢上下表面润滑条件差异性和受力变形情况,建立变形区的平衡方程和单位轧制压力计算方程。其次研究了异步与同步轧制上下轧辊压扁的差异性,根据上下轧辊轧制过程中变形的几何关系和弹塑性力学理论,确定了变形区各参数的计算方法。在此基础上,采用迭代方法提升计算模型精度,建立了适用于平整机组异步轧制过程的轧制压力计算模型,同时给出了带钢上下表面摩擦因数返算方法。最后,为了验证模型的准确性,利用国内某平整机组的设备参数和实际生产过程中的典型规格带钢工艺参数,对比不同润滑条件下本轧制压力模型理论计算值与工程适用的平整轧制压力模型计算值和现场实测数据。结果表明,提出的平整过程中异步轧制轧制压力计算模型能适用于异步轧制情况下的轧制压力计算,与工程适用的平整轧制压力计算模型相比误差减小5%,具有一定的参考价值。The phenomenon of asynchronous rolling,where the friction coefficients between the upper and lower surfaces of the strip differ due to the uneven distribution of leveling fluid droplets on the lower surface of the strip during the temper rolling process,leads to limited accuracy when predicting the rolling pressure using conventional engineering-level leveling models.To address the issue of significant errors in calculating the rolling pressure for asynchronous rolling using these models,a calculation method suitable for asynchronous rolling is proposed.This study takes into account the process characteristics of asynchronous rolling and the actual operating conditions of the equipment.Firstly,the differences in lubrication conditions and force deformation between the upper and lower surfaces of the strip are analyzed,and equilibrium equations for the deformation zone and the equation for calculating the unit rolling pressure are established.Secondly,the differences in flattening between asynchronous and synchronous rolling are investigated.Based on the geometric relationships of deformation and the theory of elastoplastic mechanics during the rolling process between the upper and lower rolls,the calculation methods for various parameters in the deformation zone are determined.An iterative method is then employed to improve the accuracy of the calculation model.A rolling pressure calculation model suitable for the asynchronous rolling process in leveling units is established,along with a method for back-calculating the friction coefficient between the upper and lower surfaces of the strip.Finally,to validate the accuracy of the model,equipment parameters from a domestic leveling unit and typical process parameters for strip production are used.The theoretical values obtained from the rolling pressure model under different lubrication conditions are compared with calculating the rolling pressure for rolling using engineering model and the on-site measured data.The results demonstrate that the proposed asynchronous

关 键 词：湿平整 异步轧制 轧制压力 数学模型 摩擦因数返算 

分 类 号：TG335.5[金属学及工艺—金属压力加工]