冷轧毛化工作辊表面粗糙度衰减过程的试验与数学模型研究

Experimental and Mathematical Model Study of Attenuation Process of the Surface Roughness of Textured Work Rolls during Cold Rolling

为了分析影响冷轧带钢工作辊表面粗糙度衰减的因素,探究典型毛化工作辊表面粗糙度的衰减规律,得到可应用于生产现场的工作辊表面粗糙度衰减过程数学模型,针对9Cr2Mo材质的工作辊和Q345材质的带钢,在不同初始粗糙度、不同压力、不同润滑油体积分数以及不同轧制里程数等条件下,进行一系列模拟冷轧带钢轧制过程的毛化表面微观形貌磨损试验。试验结果表明:在试验水平范围内,初始粗糙度、轧制里程数、轧制力对表面粗糙度衰减过程的影响高度显著,其中初始粗糙度的影响最大,其次是轧制里程数,再次是轧制力;而润滑油体积分数无显著影响;从变化过程的数学描述上,工作辊表面粗糙度的衰减量与轧制里程数成指数关系,与初始粗糙度、试验力呈线性关系。以此为依据建立毛化工作辊表面粗糙度衰减过程数学模型,并与现场实测轧辊表面粗糙度数据进行对比,验证了模型的可行性与可靠性。

In order to analyze the factors affecting attenuation of the surface roughness of textured work rolls, find out the primary and secondary order of each factor, explore the attenuation process of surface topography of typical textured rolls and obtain the mathematical model which can be applied to the production site, a series of experiments specific to 9 Cr2 Mo work rolls and Q345 strips were carried out to simulate cold rolling process under the conditions of different initial roughness, different pressure, different lubricating liquid concentration and different rolling mileage. The results show that: within the test level, the initial roughness, test mileage and rolling force are highly significant for the attenuation process of roughness, while the lubricating oil concentration has no significant effect. Among these factors, the most important influencing factor is the initial roughness, the rolling mileage is followed by, and then is the rolling force. In terms of the mathematical description of the attenuation process, the attenuation of the roughness of roll surface has a linear relationship with initial roughness and test force, while it has a exponential relationship with the rolling mileage. Based on the experiment, the mathematical model of the attenuation process of the surface roughness of textured work rolls during cold rolling is established, and the feasibility and reliability of the model is confirmed by comparing with field data.