基于应变能的工作辊辊颈轴承段多轴疲劳寿命预测方法  

Multi-axial fatigue life prediction method of working roll neck bearing section based on strain energy

作　　者：靳凯 秦晓峰 王永 瞿海霞[2] 李硕杰 秦卓扬 谢苇航 马飞扬 JIN Kai;QIN Xiaofeng;WANG Yong;QU Haixia;LI Shuojie;QIN Zhuoyang;XIE Weihang;MA Feiyang(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030002,China;Central Research Institute,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]太原理工大学机械与运载工程学院,太原030002 [2]宝山钢铁股份有限公司中央研究院,上海201900

出　　处：《机械强度》2025年第4期1-8,共8页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51805355)。

摘　　要：工作辊辊颈轴承段经常因轴承卡死等出现烧伤失效问题,现场通常采用增材制造的方式进行修复,对修复后的辊颈进行寿命预测是现场生产预估工作辊安全服役并进行检修的关键,但目前缺乏针对相关问题的研究。针对上述问题,对四辊轧机工作辊辊颈轴承段进行了应力分析和多轴寿命预测。基于西姆斯(SIMS)模型和影响函数法计算得到了轧制力和辊间应力,在轴承段取矩建立辊颈端力矩平衡方程,建立了辊颈轴承段弯曲应力模型。将变形抗力视为单位体积的塑性变形能,计算得到了变形区的轧制力矩,建立了辊颈轴承段扭转切应力模型。使用第一强度理论,联立弯曲应力和扭转切应力得到了等效应力。选用多轴疲劳模型,在证明模型计算精度的基础上,对辊颈轴承段进行了疲劳寿命预测,并与实际轧辊在生产线的服役寿命进行了对比。结果表明,该四辊轧机工作辊辊颈轴承段应力计算模型符合实际的辊颈应力状态,理论模型预测得到的服役寿命与实际服役寿命相比,误差小于20%,满足工程实际误差的要求。The bearing section of the work roll neck often suffers burnout failure due to bearing seizure,and additive manufacturing is usually used in the field to repair it.Life prediction of the repaired roll neck is the key to predict the safe service of the work roll in the field production and carry out overhaul,but there is a lack of research on the related issues.In view of the above problems,the stress analysis and multi-axis life prediction of the working roll neck bearing section of the four-high mill were carried out.Based on the SIMS model and the influence function method,the rolling force and the stress between the rolls were calculated.The moment balance equation of the roll neck end was established in the bearing section,and the bending stress model of the roll neck bearing section was established.The deformation resistance was regarded as the plastic deformation energy per unit volume to calculate the rolling torque in the deformation zone,and the torsional shear stress model of the roll neck bearing section was established.Using the first strength theory,the equivalent stress was obtained by combining the bending stress and the torsional shear stress.On the basis of proving the calculation accuracy of the model,the multi-axis fatigue model was used to predict the fatigue life of the roll neck bearing section,and compared with the service life of the actual roll in the production line.The results show that the stress calculation model of the working roll neck bearing section of the four-high mill is in line with the actual stress state of the roll neck.The error between the expected service life predicted by the theoretical model and the actual service life is less than 20%,which meets the actual engineering error requirements.

关 键 词：四辊轧机 工作辊辊颈轴承段 多轴疲劳 寿命预测 

分 类 号：TH12[机械工程—机械设计及理论]