Grinding force model for longitudinal-torsional ultrasonic-assisted face grinding of ceramic matrix composites

To provide technical support for efficient and low-damage machining of ceramic matrix composites, a method to model the grinding force for longitudinal-torsional ultrasound-assisted face grinding (LTUFG) was investigated. Based on the kinematic analysis, the influences of longitudinal and torsional vibration on the effective cutting time were investigated, respectively. The equations of the average grinding force of a single grinding grain were obtained on the basis of the impulse principle and indentation fracture theory. The number of effective abrasive grains was obtained by using image identification and statistical analysis methods. Subsequently, a grinding force model was developed, and a correction function was established to correct the model by using statistical regression theory. Finally, an orthogonal test was designed to validate the grinding force model. The results show that the maximum prediction error of the model is 18%, and the model can accurately reveal the importance of the influence of each parameter on the grinding force. The results of this work can provide theoretical support for the screening of machining parameters and scheme optimization in actual production, which has significant practical value.