Abstract：In this paper, considering the characteristics of high hardness and difficult machining of C/SiC ceramic matrix composites, we studied the optimization strategy of robotic rotary ultrasonic drilling technology. The drilling defects of ceramic matrix composites were analyzed, and the defect evaluation method based on the tearing area of the exit was adopted. The influence of the spindle speed, feed speed, ultrasonic amplitude and other process parameters on the hole quality and diameter accuracy was studied through orthogonal experiments. Variance analysis and range analysis methods were used to determine the optimal process parameters. On this basis, a tool wear test was further carried out, and the results showed that for the C/SiC ceramic matrix composite laminated plate with a thickness of 8 mm, 40 holes can be drilled with a brazing diamond trepanning drill, the hole diameter accuracy is up to H9, and the tearing area factor is within 0.2. Finally, a step drilling process strategy of “fast followed by slow” is proposed to ensure the drilling quality and efficiency at the same time.
2022, 
