轧辊表面脉冲激光三维微改形过程参数分析

Parametric analysis of pulsed Nd∶YAG laser texturing process

从研究和分析脉冲激光参数入手 ,提出了轧辊表面一种球冠状微凸新形貌的脉冲激光三维微改形 (毛化处理 )新机制 ,并最终成功获得了预先优化设计的新的三维微观形貌尺寸。在试验中 ,通过运用激光毛化新机制 ,对激光脉冲参数 (脉冲波形、脉冲能量、脉冲宽度、离焦量等 )进行了分析研究和匹配 ,并获得了该新形貌及尺寸。另对脉冲激光参数与轧辊主要形貌参数的影响规律作了进一步的研究。结果表明 ,单脉冲能量的大小及其空间分布是形成球冠状微凸新形貌和尺寸的关键因素。

According to the investigation and analysis of pulsed laser parameters,we put forward a new principle of laser texturing of a new roll surface roughness profile (slight protuberance similitude of spherical cap) and successfully achieve the optimization predesign 3D surface roughness profile and size. In the experiment,based on the new principle of laser texturing,the laser parameters,such as pulse waveform,pulse energy,pulse duration,defocusing,are primely selected and matching. Consequently,the surface roughness profile and size have been successfully obtained. Furthermore,the influence rules between pulsed laser parameters and main profile parameters of roll have been analyzed and investigated. The results show the magnitude and space distribution of single pulse energy are the key factors of producing the new surface roughness profile and size.