为了研究辅助侧吹氩气对光纤激光修锐青铜结合剂金刚石砂轮等离子体的影响, 利用高速摄像机拍摄不同侧吹工艺参数下等离子体空间膨胀形态, 结果表明: 氩气降低了等离子体的膨胀高度, 随着压力增加, 等离子体的膨胀距离减小, 等离子抑制作用增强。 利用光谱仪研究了等离子体发射光谱在砂轮径向上的最大值随氩气压力的变化情况, 并根据Boltzmann斜线法和Stark展宽法, 计算不同氩气压力下等离子体在砂轮径向上电子温度和电子数密度的最大值, 结果表明: 气体压力增大, 等离子体光谱线强度先增大后减小, 等离子体光谱线强度在0.2 MPa时达到峰值, 较大的氩气压力明显降低等离子体电子温度和电子数密度, 从而减小对砂轮表面形貌的影响。 利用超景深三维扫描仪观测添加侧吹气体前后砂轮表面形貌, 结果表明: 0.5 MPa侧吹氩气后, 砂轮表面形貌质量明显优于未添加侧吹气体时。

The effects of assistant side-blown operating parameters on the behavior of plasma characteristics and plasma geometry were studied with the aid of high-speed camera in laser dressing of bronze-bonded diamond grinding wheel. The results showed that: high pressure argon plasma reduces swelling height, and as the pressure increases, argon blowing side of the plasma effect is more obvious. Plasma emission spectrum was studied on the grinding wheel radial maximum value with the change in argon gas pressure through the acquisition of plasma emission spectroscopy using spectrometer, and according to the Boltzmann slash and Stark broadening method, the maximal values of plasma electron temperature and electron density in the wheel radial were calculated. It was found that the plasma spectral line intensity first increased and then decreased as gas pressure reached the peak at 0.2 MPa, Larger argon pressure can significantly reduce the temperature and density of plasmas. With optical 3D scanner the wheel surface topography before and after adding side-blown gas was compared. The results indicated that: the topography of grinding wheel with 0.5 MPa side-blown argon is better than that without adding side-blown gas.