为了研究青铜金刚石砂轮光纤激光辅助侧吹修锐效果, 通过青铜结合剂轮, 开展功率密度与去除深度以及烧蚀区域表面形貌关系的研究, 利用超景深三维扫描显微镜对烧蚀结果进行观测。结果表明:激光功率密度是光纤激光修锐青铜金刚石砂轮的核心工艺参数, 激光功率密度为5×107 W/ cm2时, 既保证较高结合剂材料去除效率, 又可以获得微观形貌较为理想的青铜结合剂轮表面。采用优化的工艺参数开展了光纤激光修锐青铜金刚石砂轮的试验, 借助SEM电镜扫描和超景深三维显微镜对添加侧吹气体前后金刚石磨粒形态和砂轮表面形貌进行观测。结果表明:辅助侧吹修锐, 不仅能减少覆盖在金刚石磨粒表面的熔融物, 而且能在一定程度上抑制石墨化的产生, 金刚石磨粒凸出于结合剂表面适宜高度, 砂轮表面形貌明显优于未添加侧吹气体时。

In order to study the effect of side-blown gas to dress bronze-bonded diamond grinding wheels, experiments were carried out by bronze-bond wheels. The relationships of the power density to the depth and the ablation area remove from the surface topography were researched by ultra-depth three-dimensional microscope. The results show that:the laser power density is the key process parameters of dressing bronze-bonded diamond grinding wheels. The laser power density of 5×107 W/ cm2 can not only guarantee higher binder material removal efficiency, but also get the ideal morphology surface. The laser dressing experiments were carried out at the foundation of optimization of process parameters and the diamond grains morphology and surface topography of grinding wheel before and after adding side-blown gas were compared by SEM electron microscope scanning and ultra-depth three-dimensional microscope. The results indicate that the dressing with side-blown gas can not only reduce the melt covered the surface of the diamond abrasive grains, but also produce inhibition of graphite in a certain extent. Diamond abrasives protrude from the binder surface suitable height. The topography of grinding wheel with side-blown gas is better than that without adding side-blown gas.