中南大学学报（自然科学版）2025，Vol.56Issue(12)：4992-5000,9.DOI:10.11817/j.issn.1672-7207.2025.12.005
大压下率轧制过程中摩擦力突变诱发自激振动机理研究
Study on the mechanism of self-excited vibration induced by abrupt changes in friction force during high reduction rate rolling
摘要
Abstract
Abnormal vibration with an unknown frequency of 20 Hz accompanied by a strip chasing phenomenon was observed in a 1 580 hot-rolling four-high mill under high reduction conditions.To clarify the mechanism whereby abrupt changes in friction force induce self-excited vibration,the mutation characteristics of the contact-friction direction in the rolling deformation zone at a reduction rate of 54%were analyzed by finite-element simulation,and a periodic motion mechanical model of the front-slip mass module in the deformation zone was established.The vibration response of the system was obtained by solving the second-order differential equation.The results show that the calculated natural frequency coincides with the monitored 20 Hz frequency,and when the length of the forward-slip zone exceeds the backward-slip zone,the circulation direction of the friction force between the roll and strip reverses and produces a negative damping effect,which triggers self-excited vibration during high-reduction rolling.Through reducing the roller surface friction coefficient and using high-stiffness rollers,the length of the front slip zone can be made shorter than that of the rear slip zone while maintaining the direction of the friction force consistent,which can effectively suppress self-excited vibrations.This study provides a theoretical basis and engineering reference for vibration control and stable rolling in hot continuous rolling mills.关键词
轧机/轧制变形区/大压下率轧制工艺/追逐现象/自激振动Key words
rolling mill/rolling deformation zone/high reduction rate rolling process/chasing phenomenon/self-excited vibration分类
矿业与冶金引用本文复制引用
李学通,张晓东,苟园园,郑永江,解家全,申光宪..大压下率轧制过程中摩擦力突变诱发自激振动机理研究[J].中南大学学报（自然科学版）,2025,56(12):4992-5000,9.基金项目
国家青年自然科学基金资助项目(E52005360) （E52005360）
石家庄市驻冀高校重点研发项目(241010191A) （241010191A）
唐山市科技成果转化项目(25160201A)(Project(E52005360)supported by the National Youth Natural Science Foundation of China （25160201A）
Project(241010191A)supported by the Shijiazhuang Municipal Key R&D Program for Hebei-based Universities （241010191A）
Project(25160201A)supported by the Tangshan Municipal Science and Technology Achievement Transformation Program) （25160201A）
