Investigation of force modeling in ultrasonic vibration-assisted drilling SiCf/SiC ceramic matrix composites

Due to their exceptional high-temperature and rust resilience, SiCf/SiC ceramic matrix composites have been regarded as potential high-temperature components. For application, to overcome issues resulting from the high hardness and brittleness, the ultrasonic vibration-assisted machining technique is primarily adopted in the machining of SiCf/SiC ceramic matrix composites. It is essential to develop a force model for a better understanding of the material removal and cutting processes by applying ultrasonic vibration. As a result, studies on force modeling during ultrasonic vibration-assisted drilling of SiCf/SiC ceramic matrix composites have been conducted in this study, taking into account the trajectory of the drilling tool, the tool-workpiece contact state, and the material removal mode. Based on the coefficient calibration experiment and least square method, the irregular coefficient of abrasive grains, the crack growth parameters of materials, and the mechanical parameters that are difficult to be measured were determined. After that, the drilling parameters and vibration parameters were merged to build the analytical force model, and the parameter influence rules on the force was also studied. The suggested drilling force model concurred well with tests under the highest relative error of 17.34 %, according to the findings of the confirmation experiments.

Automated summary

In this study, a force model was developed for ultrasonic vibration-assisted drilling of SiCf/SiC ceramic matrix composites, taking into account the trajectory of the drilling tool, the tool-workpiece contact state, and the material removal mode. The coefficients of abrasive grains, crack growth parameters, and difficult-to-measure mechanical parameters were determined through coefficient calibration experiment and the least square method. The drilling and vibration parameters were merged to build the analytical force model, and the influence of parameters on the force was studied. The suggested force model showed good agreement with experimental results, with a maximum relative error of 17.34%.