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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。
In order to investigate the wear characteristics and processing mechanism of the small depth grinding wheel with axial deep cutting, the wear condition of the grinding wheel, the machined surface and the microstructure of the cross section have been studied. The results show that there are plastic removal traces on the machined surface of silicon nitride (Si3N4) ceramics. No crack is found in the thickness of the metamorphic layer with the thickness of 20 ~ 50μm, and no macro cracks are observed in the matrix. The three basic wear characteristics of the main cutting zone, the transitional chip zone and the grinding zone are different. The wear of the grinding wheel increases with the grinding depth, workpiece rotation speed and feed rate , But decreases with the increase of grinding wheel speed, and the effect of grinding depth is the most significant.