冷轧带钢表面粗糙度影响因素及控制策略

来源期刊:中南大学学报(自然科学版)2017年第1期

论文作者:徐冬 张杰 李洪波 范庆国 卢劲松 董海龙

文章页码:112 - 119

关键词:冷轧;粗糙度;转印;控制策略

Key words:cold rolling; surface roughness; transfer; control strategy

摘    要:结合电火花毛化轧辊磨损形貌以及轧制界面油膜厚度的分布,建立真实表面接触的带钢表面粗糙度生成模型,研究轧辊全服役期内冷轧界面粗糙度的转印过程,并使用生产数据对模型进行验证。利用所建立的带钢表面粗糙度生成模型,确定不同磨损情况下油膜厚度与粗糙度Ra复印率的拟合关系,以此分析来料厚度、带钢屈服强度、压下率以及轧制速度对成品带钢表面粗糙度的影响。建立以调整成品机架压下率与轧制速度的冷轧带钢表面粗糙度控制策略。研究结果表明:压下率和轧制速度对表面粗糙度的转印行为有明显影响,能够成为调节带钢表面粗糙度复印率的主要手段。

Abstract: Based on the worn surface topography of EDT work roll and the distribution of lubrication oil at rolling interface, surface roughness generation model in cold rolling was established by finite element method. The proposed model was of well forecasting ability, and could accurately predict the surface roughness of cold rolled steel strip. The relationship between steel strip surface topography and the minimum lubrication oil thickness was analyzed by means of simulation results. In addition, according to the established relationship and the distribution of oil film thickness, the effect of rolling parameter on the generation of strip surface topography was obtained. Control strategy aiming at control the surface roughness of steel strip by adjusting the rolling speed and reduction ratio in S5 stand was proposed. The results show that reaction ratio and rolling speed have a significant impact on the process of surface roughness transfer.

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