Research on CFRP inner wall roughness during vibration drilling of CFRP/Ti based on acoustic emission

Abstract

Aiming at the quality problem of the CFRP inner wall in the CFRP/Ti laminated material assisted vibration drilling technology, the acoustic emission (AE) signals of different processing parameters during drilling are collected. Analyze the relationship between the characteristics of the acoustic emission signals and the roughness of the CFRP inner wall under different processing parameters and different number of holes. The test results and analysis show that other parameters are kept unchanged during the test process, only one parameter is changed. When the amplitude and spindle speed increase, the AERMS value increases while the CFRP inner wall roughness decreases. When the feed rate increases, the AERMS value and CFRP inner wall roughness increase simultaneously. The energy ratio of the wavelet packet of the AE signals is also closely related to the roughness of the CFRP inner wall. Therefore, in the actual machining process, the CFRP inner wall roughness can be monitored by monitoring the AE signals to improve the processing efficiency.