摘要
为了预测冷轧过程中组合式支承辊套内外表面的疲劳寿命,首先根据冷轧过程中组合式支承辊过盈配合面及辊套外表面的应力分布规律确定危险点位置,并应用局部应力应变法预测辊套与辊芯过盈配合面危险点处的微动疲劳寿命和辊套外表面的滚动接触疲劳寿命。在此基础上,利用疲劳寿命分析软件Fe-Safe对热装组合式支承辊辊系表面的应力应变和疲劳寿命进行了模拟。结果表明,辊套外表面危险点位于距离支承辊对称面550 mm处,此处的名义应力幅为836 MPa。辊套与辊芯间的过盈配合面危险点位于距离支承辊对称面550 mm处,此处的名义应力幅为209 MPa。辊套与辊芯间的过盈配合面的疲劳寿命约为辊套外表面疲劳寿命的4倍。从过盈配合面到外表面半径由小变大过程中,对数疲劳寿命呈"n"形分布。
To predict the fatigue life of the inner and outer surface of composite back-up roller sleeve during cold rolling,the danger point position was determined firstly according to the stress distribution of the interference fitting surface of composite back-up roller and the outer surface of roller sleeve during cold rolling.The local stress strain method was used to predict the fretting fatigue life at danger point of the interference fitting surface between roller sleeve and roller core and the rolling contact fatigue life of the outer surface of roller sleeve.On this basis,the fatigue life analysis software Fe-Safe was used to simulate the stress,strain and fatigue life on the surface of the hotmounted composite back-up roll system.The results show that the danger point on the outer surface of roller sleeve is located at 550 mm from the symmetrical surface of back-up roller,where the nominal stress amplitude is 836 MPa.The danger point on the interference fitting surface between roller sleeve and roller core is located at 550 mm from the symmetrical surface of back-up roller,where the nominal stress amplitude is 209 MPa.The fatigue life of the interference fitting surface between roller sleeve and roller core is about 4 times of the fatigue life of the outer surface of roll sleeve.The logarithmic fatigue life presents‘n’shape distribution from the interference fitting surface to the outer surface with the radius changing from small to large.
作者
董永刚
黄鑫磊
宋剑锋
史卫
DONG Yong-gang;HUANG Xin-lei;SONG Jian-feng;SHI Wei(School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China;Research and Development Department,CITIC Dicastal Co.,Ltd.,Qinhuangdao 066004,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第3期198-204,共7页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51875501)
河北省自然科学基金钢铁联合研究基金资助项目(E2015203431)。
关键词
组合式支承辊套
过盈配合面
疲劳寿命
局部应力应变法
composite back-up roll sleeve
interference fitting surface
fatigue life
local stress strain method
