Study on the influence of ultrasonic assisted cutting on the surface quality of CFRP

Abstract

Abstract In order to study the influence of machining methods and parameters on the surface quality of carbon fiber reinforced composites (CFRP) in the cutting process, the finite element simulation model of ultrasonic assisted cutting CFRP was established, the simulation results show that the damage degree of CFRP in the machining process is reduced by the introduction of longitudinal ultrasonic, the additional torsional ultrasonic vibration of the tool improves the surface quality most significantly, and the damage degree characteristic is significantly affected by the fiber angle (angle between cutting speed direction and fiber direction). To verify the correctness of the simulation model, the ultrasonic assisted torsion and longitudinal cutting tests of CFRP discs were carried out respectively, and compared with the ordinary cutting process, the test result shows that the fiber cutting angle is the main factor affecting the surface roughness of CFRP, the introduction of ultrasonic changes the mechanism of the tool on the workpiece and the mode of fiber fracture, and effectively inhibits the surface damage of CFRP, which is consistent with the simulation model. When the tool is subjected to additional torsional vibration, the surface roughness can be reduced by about 4∼6 µm, the effect of ultrasonic is better in the low-speed area, and the direction of fiber can be weakened by high-speed processing. When the amplitude is in the range of 0∼6 µm, with the increase of amplitude, the advantage of ultrasonic is more obvious, and the directional inhibition of fiber is more obvious.