纵扭超声磨削 ZrO₂ 陶瓷表面形貌及粗糙度特征研究

As a typical hard⁃brittle material, ZrO₂ ceramics is difficult to obtain good surface quality with ordinary grinding methods. However, ultrasonic vibration grinding can significantly improve its machining effect. In this paper, longitudinal torsion ultrasonic vibration is applied to grinding, and the comparison test of the ordinary grinding (OG) with the longitudinal torsion ultrasonic grinding (LTUG) was designed with single factor method. The surface roughness R_a value and microstructure of processed materials were used as evaluation indexes. The influence law of each technological parameter on the surface quality is analyzed and obtained. The result shows that the surface R_a value via LTUG was always lower than that via OG, and the grinding surface was more uniform and smooth; comparing with OG, R_a value via LTUG decreases firstly and then increases with the increasing of ultrasonic energy, and at the same time, they both decrease firstly and then increase with the increasing of grinding depth, and decrease gradually with the increasing of spindle speed; in addition, the surface R_a value via OG increases firstly and then decreases with the increasing of feed speed, while the LTUG increases continuously and gradually approaches OG.