轧辊表面球冠状微凸形貌的激光加工

随着汽车工业的飞速发展,对冷轧薄板表面质量特别是表面微观形貌提出了更加严格的要求。本文针对从摩擦学角度优化设计的轧辊表面球冠状微凸新形貌,依据脉冲激光参数特性及快速熔凝理论,提出了脉冲激光毛化处理的新机制。试验中,采用500W脉冲Nd:YAG固体激光器对轧辊表面进行毛化处理,通过对激光毛化新机制的分析和研究,很好的选取和匹配了激光加工工艺过程和脉冲激光参数,最终成功获得了预先设计的形貌及尺寸。并进一步对其表面硬度状况进行了测量和分析。研究表明,辊面形貌和粗糙度能够得到精确的控制;微凸的激光毛化新形貌具有高于材料基体的表面硬度。此外还对脉冲激光参数对轧辊主要形貌参数的影响规律作了进一步的分析和研究。

Laser texturing of spherical cap slight protuberance profile on roll surface

With the development of automobile industry, surface roughness of steel sheet for automotive use is one of the most important control items. In this paper, aimed at a new type of roll surface roughness profile (slight protuberance similitude of spherical cap) optimization designed by tribology method, we present a new principle of laser texturing. In the experiment, a pulsed laser beams generated by Nd:YAG laser is adopted to process the roll surface. According to the analysis and investigation of the new principle of laser texturing, the laser parameters are primely selected and matched. Consequently, the surface roughness profile and size have been successfully obtained. Furthermore, we measure and analyze the surface roughness hardness. The results show: the surface roughness has higher hardness rather than matrix. In addition, the influence rules between pulsed laser parameters and main profile parameters of roll have been analyzed and investigated.