首先用波长为10.6 μm的二氧化碳激光对TC4合金表面进行抛光。利用三维形貌仪测量材料表面粗糙度, 结合抛光前后材料表面微观形貌特征分析激光功率、离焦量、扫描速度、扫描间距等因素对该材料表面粗糙度的影响。获得理想的工艺参数, TC4合金表面粗糙度具有最小值117.62 nm。但二氧化碳激光抛光TC4合金容易出现热积累严重和表面裂纹等问题。然后用波长为1 080 nm的光纤激光对TC4合金进行抛光, 同样分析了金属表面形貌、离焦量和扫描路径等因素对该材料表面粗糙度的影响规律。创新性地使用多重移动扫描抛光, 获得理想的抛光效果, TC4合金表面粗糙度最佳为148.91 nm。以上实验结果表明, 使用光纤激光器进行多重移动扫描可以快速有效抛光TC4合金, 且激光能量密度较小, 表面无明显形变和裂纹。

First of all, using a carbon dioxide laser with a wavelength of 10.6 μm, the surface of TC4 alloy was polished. The surface roughness of the material was measured with a three-dimensional profile instrument. The influences of factors on the surface roughness such as laser power, defocus amount, scanning speed, and scanning pitch were analyzed in combination with the micro-morphology of the material surface before and after polishing. Obtaining the ideal process parameters, the minimum surface roughness of the TC4 alloy was 117.62 nm. However, thecarbon dioxide laser polishing caused serious heat accumulation and obvious surface cracks. Then, using a fiber laser with a wavelength of 1080 nm polished the TC4 alloy.Similarly, The effects on the surface roughness such as surface morphology, defocus amount, and scanning path were analyzed. Innovatively using multiple moving scanning polishing, theoptimal polishing effect was achieved. The minimum surface roughness of the TC4 alloy was148.91 nm. The experimental results show that the using of the fiber lasers for multiple shifting scans can more quickly and effectively polish the TC4 titanium alloy. And due to the low laser energy density, there is no obvious deformation and cracks on the surface of the TC4 alloy.