This paper investigates the surface texture transfer with elastically deformed work rolls in skin-pass rolling. A numerical approach was developed to efficiently overcome the multiscale challenges associated with the numerical characterisations. To couple the microscale plastic deformation of strip surface asperities with the microscale elastic deformation of roll surface asperities, a specific method was first developed to generate the characteristics between normal contact pressure and interface separation. To deal with the three-dimensional deterministic rough surfaces, a material redistribution scheme was used to predict the plastic deformation of the strip surface asperities and a discrete fast Fourier transform algorithm was employed to efficiently calculate the elastic deflection of the roll surface asperities. These enabled the subsequent multiscale analysis in coupling the microscale interface contact with the macroscale deformation of the metal strip and work roll. As such, the stick/slip transition in the rolling bite due to the elastic deformation of the roll as well as the surface topography of the rolled strip have been quantified. The new method has successfully revealed the effects of elastic roll deformation, roll radius, and strip thickness/roughness on the resultant surface texture of strips in skin-pass rolling.

本文研究了光整轧制中弹性变形工作辊的表面织构转移。开发了一种数值方法来有效克服与数值表征相关的多尺度挑战。为了将带材表面粗糙的微观塑性变形与轧辊表面粗糙的微观弹性变形耦合在一起，首先开发了一种特殊的方法来产生正常接触压力和界面分离之间的特性。为了处理三维确定性粗糙表面，使用了一种材料重新分配方案来预测带钢表面粗糙的塑性变形，并采用离散快速傅里叶变换算法来有效地计算轧辊表面粗糙的弹性挠度。这些使得随后的多尺度分析能够将微观尺度的界面接触与金属带和工作辊的宏观尺度的变形耦合起来。这样，已经量化了由于轧辊的弹性变形以及轧制带材的表面形貌所引起的轧制咬合中的粘着/滑移过渡。新方法成功地揭示了弹性轧辊变形，轧辊半径和带材厚度/粗糙度对光整轧带钢最终表面纹理的影响。