冷轧平整机毛化辊表面形貌特征多参数对比分析

Surface topography multi-parameter analysis of textured rolls in cold temper mill

冷轧带钢的表面形貌对其冲压、摩擦和涂镀性能有重要影响,带钢的表面形貌是通过毛化工作辊在轧制中反向复印形成的,因此工作辊的表面形貌是冷轧带钢表面形貌的决定性因素之一。满足粗糙度Ra、峰密度Pc条件的激光、电火花和喷丸毛化工作辊,在服役周期内表现出不同的润滑、磨损和复印等工作特性。通过实际测量生产现场3种毛化工作辊的表面形貌,针对方向性、空间特性、频域特性、功能特性等问题,对表面特征进行系统地比较和评价。结果表明:激光毛化辊表面各向同性,波纹细密,凸峰曲率半径小,更有利于生产表面形貌均匀的带钢;激光、电火花毛化辊表面相比于喷丸毛化辊表面,具有良好的润滑和承载性能,有利于延长工作辊的服役周期。

The surface topography of cold rolled steel strip is crucial to its drawability, tribological and coating property. It is inherited from the textured work rolls in steel strip cold rolling. Accordingly, the surface topography of work rolls plays an important role in the generation of strip surface. The rolls textured in different ways and completely meeting Ra and Pc requirements have unequal various lubrication, wear and duplication behavior in service cycle of rolls. The directional texture, spatial character, frequent character and functional character of rolls were compared systematically by surface topography of the textured rolls. The results show that the isotropic laser textured roll surface with smaller mean radius of asperities is more conducive to generate uniform surface topography. Meanwhile, the surface of laser and electric discharge textured roll has better lubrication and bearing performance than that of shot blast textured roll.