In order to solve the problem of poor export quality of brittle materials such as engineering ceramics

rotary ultrasonic grinding technology is adopted. Based on Abaqus software

the simulation model of rotary ultrasonic grinding is established. According to the stress condition

the forming mechanism of edge collapse at the hole exit is simulated and analyzed. The experiment of rotary ultrasonic grinding of glass ceramic inner hole is designed to study the influence of different process parameters on the edge collapse area. The results show that with the increase of the depth of the inner hole

the compressive stress in the initial stage of the glass ceramics gradually changes into the tensile stress

and under the action of the tensile stress

cracks are formed and the edge collapse occurs at the exit. The edge collapse area decreases gradually with the increase of the spindle speed and the ultrasonic power. The edge collapse area increases gradually with the increase of the feed speed. Compared with the conventional grinding method

rotary ultrasonic machining can effectively reduce the area of edge collapse at the outlet. When the ultrasonic power is 100W

the area of edge collapse at the outlet is reduced by 57.8%

which greatly improves the quality of inner hole grinding.