关键词: 斜向, 超声振动辅助磨削, 动力学模型, 磨削力, 表面粗糙度

Abstract: Previous studies about one dimensional ultrasonic vibration assisted grinding were limited to fixed directions of ultrasonic vibration such as one dimensional axial or tangential vibration. A novel process of oblique ultrasonic vibration assisted grinding was presented. The motion paths of abrasive particles in oblique ultrasonic vibration assisted grinding were simulated in MATLAB. A dynamics model of experimental ultrasonic vibration system was established. Experimental devices of oblique ultrasonic vibration assisted grinding were designed through modal analysis of ultrasonic workbench. Grinding forces and surface roughnesses in grinding rolling bearing steels were studied at different directions of ultrasonic vibrations. The regulation of grinding forces and surface roughnesses with the direction of ultrasonic vibration was studied. Experimental results show that the best surface quality may be obtained when the angle of ultrasonic vibration is as 67.5° and grinding forces are also decreased. Results of orthogonal experiments demonstrate that ultrasonic vibration angle of 67.5°, wheel speed of 20m/s, workpiece speed of 0.5m/min, grinding depth of 4μm are the optimum parameters to obtain the best surface quality of workpiece， and the speed of workpiece has the most important impacts on the surface quality of workpiece.

Key words: oblique, ultrasonic vibration assisted grinding, dynamics model, grinding force, surface roughness