冷轧四辊轧机弹性变形在线模型

Online model research for elastic deformation of 4-high cold mill

为提高轧机弹跳值的计算精度,开发一种四辊轧机弹性变形的在线计算模型,模型中将轧机弹性变形分为辊系弹性变形和轧机牌坊弹性变形;综合考虑各影响因素,设计辊系和轧机牌坊弹性变形的模型结构。基于所设计的模型结构和测试方案,针对某1 800 mm单机架可逆冷轧机,采用影响函数法得到支撑辊辊径、工作辊辊径、带钢宽度、轧制力和弯辊力等因素对辊系弹性变形的影响,并建立辊系弹性变形在线模型;通过对轧机的现场测试,回归得到轧机牌坊弹性变形模型中的系数,并应用于该机组中。研究结果表明:采用该模型,辊缝设定值的计算偏差可控制在±0.1 mm以内,表明该模型具有较高的计算精度,满足现场控制要求。

In order to improve the mill spring calculation accuracy, a new online elastic deformation model for 4-high cold mill was put forward. In the model, the mill elastic deformation was divided into two parts, i.e. rolls elastic deformation and mill housing elastic deformation. Combining all the influence factors, the model structure of rolls and mill housing elastic deformation were designed. Based on the proposed model structure and test scheme, aiming at a 1 800 mm single-stand reversible cold mill, the effect of every factors on the rolls elastic deformation, such as back-up roll diameter, work roll diameter, strip width, rolling force and bending force, were obtained by means of influential function method, and the online model of rolls elastic deformation was established. Based on the actual test data of a single-stand cold mill, the coefficients of mill housing elastic deformation model were obtained, and the proposed mill elastic deformation model was applied in this mill. The results indicate that the calculation deviation of roll gap value is within ±0.1 mm, which shows that the model is accurate and it can meet the requirement of online process control.