激光修整青铜金刚石砂轮石墨变质层的研究

针对声光调Q YAG脉冲激光修整青铜结合剂金刚石砂轮，运用ANSYS有限元软件建立了三维脉冲激光烧蚀金刚石磨粒的数学模型和传热模型，得到了激光烧蚀金刚石磨粒后的温度分布。利用所建立的模型可获得不同激光参数下的变质层厚度，并通过实验对该模型进行了验证。针对脉冲激光修锐与整形的两个不同方面，从实验和数值模拟两方面研究脉冲激光参数对变质层厚度的影响规律，得到在修锐时脉宽与激光功率对变质层厚度影响程度相差不大，而在整形时脉宽则起到了绝对的主导作用；经过多脉冲激光烧蚀后变质层厚度有所减小；只有在砂轮修锐时石墨变质层厚度随脉宽的增加而减少。

Abstract

For the truing and dressing bronze-bonded diamond grinding wheel by acoustic-optic Q-switched YAG pulsed laser, a three-dimensional (3D) mathematical simulation model and a heat transfer model of single pulsed laser ablating the diamond abrasive are established by ANSYS finite element software. The models show the temperature distribution of diamond under different laser parameters, and they are proved to be correct through experiments. According to the two different procedures of dressing and shaping of bronze-bonded diamond grinding wheels, from both experiment and numerical simulation much research work is done on the relationship of pulsed laser parameters and the depth of carbonized layer. The results show that there is not much difference between the influences of pulse width and laser power on the depth of carbonized layer in dressing, but pulse width plays a dominant role on the depth of carbonized layer in shaping; and the depth of carbonized layer will decrease after multi-pulse ablation; only in dressing will the depth of carbonized layer decrease with the increase of pulse width.

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