Scanning Ablation Characteristic Control for Femtosecond Laser Finishing of Face Gears

doi:10.3969/j.issn.1004-132X.2022.13.005

Abstract

Abstract: Based on the energy accumulation effect of femtosecond laser ablation of flank gears， a three-temperature heat transfer model of coupling between photon-electron-lattice systems was established herein， and a method to determine the scanning distance between femtosecond laser ablation tooth surfaces was proposed. The simulation shows that when the energy density is as 6.47 J/cm2， the equilibrium temperature 3200 K exceeds the melting temperature of materials， and the heat accumulation effect is obvious. The cumulative laser intensity was calculated according to different scanning distances to control the depth and contour of pit ablation. The experimental results show that when the energy density is as 6.47 J/cm2， with the decrease of scanning distance， the laser cumulative intensity increases， and the ablation depth of the tooth surface increases linearly； when the scanning distance is as 25 μm， the machining quality of the gear surfaces is good.

Key words: , femtosecond laser, three-temperature heat transfer model, energy accumulation effect, ablation depth

摘要： 基于飞秒激光精修面齿轮时的能量累积效应，建立了光子-电子-晶格系统间耦合作用的三温传热模型，提出一种确定飞秒激光烧蚀齿面扫描路径间扫描间距的方法。仿真得出，能量密度为6.47 J/cm2时，平衡温度3200 K超过材料的熔化温度，热累积效应明显。根据不同的扫描间距计算激光累积强度，以控制凹坑烧蚀深度和轮廓。实验结果显示，能量密度为6.47 J/cm2时，随着扫描间距的减小，激光累积强度增大，齿面的烧蚀深度线性增大；扫描间距为25 μm时的齿轮表面加工质量良好。

关键词: 飞秒激光, 三温传热模型, 能量累积效应, 烧蚀深度

CLC Number:

TN24

MING Xingzu, XIAO Yongbo, LIU Kefei, ZHOU Xian, ZHANG Haibo, MING Rui. Scanning Ablation Characteristic Control for Femtosecond Laser Finishing of Face Gears[J]. China Mechanical Engineering, 2022, 33(13): 1544-1550.

明兴祖, 肖勇波, 刘克非, 周贤, 张海波, 明瑞. 飞秒激光精修面齿轮的扫描烧蚀特征控制[J]. 中国机械工程, 2022, 33(13): 1544-1550.

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