摘要
为了准确定量预测冷轧过程中组合式支承辊过盈配合面应力分布规律及冷轧和装配工艺参数对应力分布的影响,基于ABAQUS软件完成了冷轧过程组合式支承辊辊套内外表面应力分布仿真。得到了冷轧过程中组合式支承辊过盈配合面及辊套外表面各应力分量沿轴向和周向分布,并分析了辊套厚度、摩擦系数、过盈量、轧制力、弯辊力以及辊套和辊芯倒角对冷轧过程辊套内外表面Mises应力分布的影响。研究结果表明：支承辊外径不变时,辊套厚度与过盈配合面Mises应力成正比,而辊套厚度与辊套外表面Mises应力成反比;摩擦系数对辊套过盈配合面Mises应力影响很小;当过盈量增大时,辊套过盈配合面上接触应力及Mises应力明显增大,辊套外表面Mises应力有小幅度增加;轧制力增大导致过盈配合面及辊套外表面压扁区Mises应力明显增大,而对其它区域应力分布影响不明显,弯辊力对过盈配合面及辊套外表面Mises应力影响均较小;辊套外表面外倒角和辊芯外倒角对降低冷轧过程辊套过盈配合面外端部应力集中有明显作用,辊套外倒角对辊套外表面端部应力分布影响显著,而辊芯倒角对冷轧过程辊套外表面端部应力分布影响很小。
For accuratel/quantitative predict the distribution characteristics of stress on the inner and outer surfaces of roll sleeve of composite back-up roll during strip cold rolling and the influence of cold roll assembly process parameters on stress distribution,the stress distribution on inner and outer surfaces of roll sleeve of composite back-up roll in process of strip cold rolling was simulated by ABAQUS finite element（ FE） software. Then the stress components on the interference fit surface of composite back-up roll and outer surface of roll sleeve along the axial direction and circumferential direction in the cold roll process were obtained. In addition,the influence factors such as the thickness of the roll sleeve,friction coefficient,interference range,rolling force,bending force and chamfers of roll sleeve and roll mandrel on the Mises stress on the inner and outer surfaces of roll sleeve were analyzed. It can be concluded that,when the outer diameter of the back-up roll is constant,the Mises stresses on the interference fit surface of the roll sleeve is in direct proportion to the thickness of roll sleeve,but the Mises stress on the outer surface of the roll sleeve is inversely proportional to the thickness of roll sleeve. The friction coefficient has little influence on the Mises stress on the interference fit surface of the roll sleeve,and the contact and Mises stresses on the interference fit surface increase significantly with the increase of the interference range,and the Miese stress on the outer surface of the roll sleeve increases a little with the increase of the interference range; with the increase of the rolling force,the Mises stress on the flatten zone of interference fit and outer surface increases sharply,and the influence on stress distribution on other regions is not obvious. The in-fluence of bending force on the Mises stress on the interference fit and outer surface is less. Furthermore,the outer chamfers on the outer surface of the roll sleeve and roll mandrel can relieve the stress concentration on the edge of interference fit surface of roll sleeve,and the outer chamfer influences the edge stress on the outer surface of roll sleeve significantly. The effect of roll mandrel chamfer on edge stress on the outer surface of roll sleeve during cold rolling is small.
作者
董永刚
宋剑锋
朱衡
史卫
DONG Yong-gang;SONG Jian-feng;ZHU Heng;SHI Wei(School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;CITIC Dicastal Co. , Ltd. , Qinhuangdao 066004, China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2018年第3期274-281,共8页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(50775196)
河北省钢铁联合研究基金(E2015203431)
河北省博士后科研项目一等资助(B2011001)
关键词
组合式支承辊
带材冷轧
应力分布
内外表面
影响因素
composite back-up roll
strip cold rolling
stress distribution
inner and outer surfaces
influence factor
