摘要
随着板带产品不断提高的质量需求,对板带轧机装备精度的要求也日益严格,轧机装备的精度是保证产品质量的基础。板带轧机辊间接触刚度是保证产品质量的基础参数,也是关于轧制过程稳定性的重要参数。当前,轧机辊间接触刚度模型仅考虑辊系弹性变形与受力的关系,而轧辊在其上机服役的周期内,轧辊表面状态不断恶化,辊间接触摩擦状态发生变化,传统辊间接触刚度模型未考虑辊间接触摩擦因素,导致模型不能准确反映轧制过程中随轧辊表面状态对辊间接触刚度的影响。为了对轧机辊间接触刚度进行全面深入的研究,需要建立考虑摩擦因素的辊间接触刚度模型。基于上述问题,以分形理论为基础对轧辊粗糙表面进行建模,通过分析轧辊粗糙表面微凸体接触的变形状态与辊系曲面接触特征,建立了考虑摩擦因素的辊间法向接触刚度模型,并以2250mm热轧机为例,研究了分形参数、辊间接触参数与辊系尺寸对辊间接触刚度的影响规律。通过研究发现,分形维数、分形粗糙度与辊间接触刚度的关系分别为正相关与负相关,两者共同指示了轧辊表面越粗糙辊间接触刚度越小。同时,随着辊间接触摩擦因数的增大,辊间接触刚度逐渐减小,辊间接触载荷与辊径越大,辊间接触刚度越大。所建立的模型可为评价轧机装备精度提供参数基础与理论依据。
With the growing demand for high-quality strip products,the precision requirements for strip mill equipment have become increasingly stringent,and the precision of the mill equipment plays a pivotal role in ensuring product quality.The contact stiffness between rolls in the strip mill is a fundamental parameter that not only ensures product quality but also significantly impacts the stability of the rolling process.Presently,the rolling mill roll contact stiffness model takes into account the elastic deformation of the roll system and the force relationship.However,during the service cycle of the rolls,the surface condition continually deteriorates,leading to changes in the roll contact friction state.The conventional roll contact stiffness model does not consider these contact friction factors,resulting in an inability to accurately reflect the rolling process and the influence of the roll surface state on the interroll contact stiffness.To address this limitation,a comprehensive investigation into the inter-roll contact stiffness of rolling mills requires the establishment of a model that considers friction.This study leverages fractal theory to model the rough surface of rolls and analyzes the deformation state of micro-convex body contacts on the roll's rough surface,along with the curved surface contact characteristics of the roll system.As a result,a normal contact stiffness model is developed,which incorporates frictional effects between rolls.The 2250mm hot rolling mill is used as a case study to explore the impact of fractal parameters,contact parameters between rolls,and the size of the roll system on the inter-roll contact stiffness.The findings indicate that fractal dimension and fractal roughness are positively and negatively correlated with inter-roll contact stiffness,respectively,suggesting that a rougher roll surface results in lower inter-roll contact stiffness.Additionally,an increase in the inter-roll contact friction coefficient leads to a gradual decrease in inter-roll contact stiffness,whil
作者
王瑾
彭艳
赵向阳
王梦寒
李爱民
马斌
WANG Jin;PENG Yan;ZHAO Xiangyang;WANG Menghan;LI Aimin;MA Bin(School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,Hebei,China;Hanbao Hot Rolling Plant,Hansteel Group Hanbao Iron and Steel Company,Handan 056000,Hebei,China)
出处
《钢铁》
CAS
CSCD
北大核心
2024年第1期91-98,共8页
Iron and Steel
基金
国家自然科学基金区域创新发展联合基金重点资助项目(U20A20289)
国家留学基金委员会基金资助项目(202208130100)
河北省自然科学基金创新研究群体资助项目(E202103011)。
关键词
接触力学
分形理论
微凸体
辊间接触刚度
摩擦因素
contact mechanics
fractal theory
asperity
inter-roller contact stiffness
friction coefficient
