小砂轮轴向大切深缓进给磨削的磨损特征

Wear Characteristics Study of Axial Deep Creep-feed Grinding with Small Grinding Wheel

为了探讨小砂轮轴向大切深缓进给磨削技术的磨损特征和加工机理,对砂轮磨损情况、已加工表面和断面显微形貌等方面开展了研究。结果表明:氮化硅(Si3N4)陶瓷的已加工表面显微形貌存在塑性去除痕迹;断面形貌除20~50μm的变质层厚度存在裂纹缺陷外,基体部分未发现宏观裂纹;金刚石小砂轮的主切削区、过渡切屑区和修磨区存在的摩擦磨损、磨粒破碎和结合剂破碎3种基本耗损特征不同;砂轮磨损随着磨削深度、工件转速、进给速度的增大而增大,但随砂轮转速的增大而减小,且磨削深度影响作用最显著。

To explore the unique wear characteristics and mechanism of axial deep creep-feed grinding with small grinding wheel,it studies the wear condition of grinding wheel,machined surface and section micro topography.It shows that there are some plastic removal traces on the machined surface of Si3 N4 ceramics.In addition to the presence of crack defects in the surface layer thickness of 20 50 μm,there is no crack in the base material.Wear characteristics of the friction wear,grain chipping and bond bro-ken in the main cutting area,transitional cutting chip area and the grinding zone of the small grinding wheel are different.With the increase of the grinding depth,workpiece speed and feed rate,the grinding wheel wear increases.With the increase of the grinding wheel speed,the grinding wheel wear decreases. The influence of grinding depth is the most significant.