中国激光, 2015, 42 (12): 1203005, 网络出版: 2015-12-01   

同点间隔多次激光微织构工艺研究

Research on Laser Surface Micro Texturing Processing of Single Pulse Intervals
作者单位
江苏大学机械工程学院, 江苏 镇江 212013
摘要
探讨了单脉冲同点间隔多次(SPI)工艺对激光微织构加工效果的影响。采用纳秒倍频Nd3+∶YAG 激光器在45钢表面进行激光微织构实验,研究激光能量密度、脉冲个数对微凹腔几何形貌参数的影响规律;分析烧蚀所致表面等离子体对激光吸收率的影响;并从实验和温度场模拟角度,对比分析了SPI工艺相比同点连续多次工艺的特点及技术优势。结果表明:随激光能量密度增加,微凹腔直径呈对数函数关系增加,而凹腔深度则随之先增大后趋于平稳,最后略微下降。作用脉冲个数对凹腔直径影响不明显,但凹腔深度随之呈线性增加。较之同点连续多次工艺,SPI工艺能最大限度降低激光加工产生的负面热效应,且多脉冲作用对微织构内部形貌具有“平滑”作用;同时,在保证单个脉冲材料去除率的条件下,提高了激光加工高质量微织构的总效率。
Abstract
Effect of single pulse intervals (SPI) processing on the laser micro texture is discussed. An investigation on the 45 steel samples is performed by using a nanosecond frequency doubling Nd3+∶YAG laser. The influencing laws of laser parameters (the laser fluence, number of pulses) and the geometrical parameters of micro-crater as well as surface plasma absorption rate of laser are investigated. Compared with continuous pulses processing, the advantage of SPI are analyzed from experiment and temperature field simulation. The results show that with the increase of the laser fluence, the micro-crater diameter increase with a logarithmic function, while the micro-crater depth increases, then level off, finally fall slightly down. Effect of pulse number on micro-crater diameter is not significant, but the micro- crater depth increases linearly. Compared with continuous pulses processing, SPI minimizes the heat effect which is negative, and the effect of multiple pulse on micro texture internal morphology has a "smooth" role; when ensuring the material removal rate of a single pulse, the efficiency of the laser processing high quality micro texture is improved.

符永宏, 刘强宪, 叶云霞, 华希俊, 康正阳, 符昊. 同点间隔多次激光微织构工艺研究[J]. 中国激光, 2015, 42(12): 1203005. Fu Yonghong, Liu Qiangxian, Ye Yunxia, Hua Xijun, Kang Zhengyang, Fu Hao. Research on Laser Surface Micro Texturing Processing of Single Pulse Intervals[J]. Chinese Journal of Lasers, 2015, 42(12): 1203005.

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