摘要
轧制力模型的准确性对轧制过程中轧件厚度的控制起着决定性的作用。传统的轧制力模型假设轧辊为圆弧形,但是随着极薄带厚度的减小,变形区接触弧长远远大于轧件厚度,此时轧件已被压扁为非圆弧形轮廓。针对上述问题,Fleck基于赫兹接触理论准确求解了变形区轧辊轮廓,从而建立了新的轧制力模型,但是,Fleck解析方法比较复杂,针对不同的轧制工况建立了不同的计算方法。为了建立简化的解析方法,不仅统一了整个变形区轧制压力与摩擦力的表达式形式,而且忽略了中性区弹性卸载现象。通过对比简化模型计算结果与Fleck模型计算结果、实测的变形区轮廓,验证了简化解析模型的准确性。利用该简化模型分析了不同因素对变形区接触弧轮廓及接触压力分布的影响。结果表明,随着来料厚度减小、工作辊弹性模量减小、压下量增大,变形区轧辊弹性压扁越来越严重。
The accuracy of the rolling force model plays a decisive role in the control of the strip thickness in the rolling process.The conventional rolling theories assumes that the roll is a circular arc.However,as the ultra-thin strip thickness decreases,the contact arc length of the deformation zone is much greater than the strip thickness,resulting in a non-circular contour.For the above problems,Fleck accurately solved the roll contour in the deformed zone based on the Hertzian contact theory,and established a new rolling force model.However,the Fleck's analytical method is more complex,where different calculation methods have been established for different rolling conditions.To establish a simplified analysis method,not only the expression forms of rolling force and friction force in the entire deformation zone are unified,but also the elastic unloading phenomenon in the neutral zone is ignored.Then,by comparing the results calculated by simplified model with the results calculated by Fleck model and measurements,the accuracy of the simplified analytical model is verified.The influence of different factors on the contact arc profile and contact pressure distribution in the deformation zone is analyzed by the simplified model.The results show that with the decrease of the inlet strip thickness and the elastic modulus of the work roll,and the increase of the reduction,the elastic flattening of the work roll in the deformation zone becomes more and more serious.
作者
任忠凯
王涛
王跃林
范婉婉
付文石
郭雄伟
REN Zhong-kai;WANG Tao;WANG Yue-lin;FAN Wan-wan;FU Wen-shi;GUO Xiong-wei(School of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China)
出处
《钢铁》
CAS
CSCD
北大核心
2018年第12期62-68,共7页
Iron and Steel
基金
国家自然科学基金资助项目(51474190)
太原市重大科技专项资助项目(170203)
关键词
极薄带
变形区轮廓
接触压力
Fleck理论
解析方法
ultra-thin strip
contour in deformation zone
contact pressure
Fleck theory
analytic method
作者简介
任忠凯(1988-),男,博士,讲师;E-mail:zhongkai_0808@126.com;通讯作者:王涛(1985-),男,博士,讲师;E-mail:tyutwt@163.com
