脉冲光纤激光修锐青铜金刚石砂轮试验研究

Experimental study about dressing bronze-bonded diamond grinding wheels with pulsed fiber laser

为了寻求超硬磨料砂轮的修锐新方法,采用脉冲光纤激光径向辐照,对青铜结合剂金刚石砂轮进行了修锐试验研究。理论分析了脉冲激光修锐青铜结合剂金刚石砂轮的基本原理;借助超景深3维显微系统和粗糙度测试仪,获得了脉冲光纤激光烧蚀青铜结合剂轮烧蚀凹坑的表面形貌和深度,总结了激光平均功率、脉冲重复频率和离焦量等参量对烧蚀效果的影响规律;根据试验结果选择最佳工艺参量(P m=20W,f=70kHz,Δ=0.0mm),开展了激光修锐青铜结合剂金刚石砂轮的试验,并采用超景深3维显微系统对修锐后的砂轮表面形貌进行观测。结果表明,在合理工艺参量下,脉冲光纤激光径向辐照修锐青铜结合剂金刚石砂轮,可获得良好的修锐效果。

In order to find a new method to dress super-abrasive grinding wheels, experiments were carried out on bronze-bonded diamond grinding wheels with a pulsed fiber laser irradiating in radial orientation. Its basic principle was analyzed. After the ablation of bronze-bonded wheel by means of a pulsed fiber laser, the surface morphology and depth of ablated craters were observed by 3-D video microscopy system with super depth of field and surfagauge, and the influences of laser average power, pulse repetition frequency and defocusing amount on the ablation effect were summarized. According to the experimental results, the laser dressing experiments were carried out with the best process parameters （Pm, = 20W, f = 70kHz,△= 0. 0mm）, and the surface topography after laser dressing was observed by a 3-D video microscopy system with super depth of field. The results show that, dressing of bronze-bonded diamond grinding wheels with a pulsed fiber laser irradiating in radial orientation can bring out good dressing effect with the reasonable processing parameters.