摘要
现场跟踪实测并分析CVC轧机支持辊综合辊形数据,发现CVC轧机支持辊存在严重且不均匀磨损,并时有严重边部剥落事故发生。建立MSC.Marc二维动态弹塑性有限元模型分析了支持辊辊内应力状态,提出较大的辊间接触压力及支持辊工作层厚度的减小,对辊内应力具有不利影响,指出不均匀的辊间接触压力分布,是支持辊不均匀磨损甚至剥落的主要原因。建立ANSYS静态弹性有限元模型,分析板宽、单位轧制力、弯辊及窜辊对辊间接触压力分布的影响,发现带钢宽度的不断变化有利于改善支持辊的受力状况,而弯辊和负向窜辊均会增大辊间接触压力分布不均匀度系数。基于有限元仿真和现场工业试验,提出了CVC轧机支持辊新辊形,与引进的原常规支持辊相比,新支持辊服役前期的不同窜辊位置辊间接触压力峰值和辊间接触压力分布不均匀度系数分别下降了3.5%～16.0%和3.5%～15.9%,支持辊服役后期的辊间接触压力峰值和不均匀度系数分别下降25.7%和28.3%。1800 mmCVC热连轧机F3～F4机架工业应用实践证明,新辊形自保持性好,性能稳定,已投入工业应用,可推广应用到同类轧机。
Serious asymmetric wear exist at the contour of backup roll on CVC mill and sometimes causing serious spalling accident. The analysis of the stress in the rolls based on the MSC. Marc finite element model shows that higher contact pressure and thinner work shell of backup roll are disadvantageous to stress distribution, while the asymmetric contact pressure on the backup roll is the basic reason for appearing abnormal wear contour and spalling accident. The ANSYS finite element model is established for analyzing the effect of strip width, rolling force, work roll bending and shifting on the contact pressure distribution. It shows that the variation of the strip width is beneficial to the contact pressure distribution, and the work roll bending and negative shifting will increase the contact pressure peak and non-uniformity of the roll contact pressure. Based on the FEM analysis and industrial test, a new backup roll contour for CVC mill is proposed, which can lower the peak and the non-uniformity of the roll contact pressure in different shifting position by 3.5% to 16.0% and 3.5% to 15.9% before service, 25.7% and 28. 3% by the end of the service comparing with the conventional backup roll contour. The practice of the new backup roll on F3 to F4 stands of a 1800mm CVC hot strip mill validates the good self-maintenance of the new contour.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2010年第2期84-89,共6页
Journal of Plasticity Engineering
基金
北京科技大学科技发展专项基金资助项目(20050311890)
关键词
热轧
CVC
支持辊
有限元方法
应力
辊间接触压力
hot rolting
CVC
backup roll
finite element method
stress
roll contact pressure
作者简介
李洪波 E-mail：ustbandy@sohu．com 李洪波，男，1982年生，黑龙江省哈尔滨市，北京科技大学机械工程学院，讲师，博士后，主要研究方向为板带轧机辊形及板形控制
