In order to improve the machinability and machining accuracy of glass fibre reinforced plastic (GFRP)

GFRP is finish cut using ultrasonic vibration. Experimental results indicate that the phase parameters of GFRP fibres with respect to cutting direction change in the circumferential direction at cycle; the variation of surface roughness with the phase angle under different cutting conditions is sinusoidal with maximum roughness at 45?; an increase in amplitude causes an obvious drop in roughness; the variation of roughness with cutting speed is extremal

and roughness is minimum at 100 m/min; the surface roughness goes down when the feed is less than 0.06 mm

the roughness increases much faster when the feed is more than 0.06 mm

and the increase in roughness slows down when the feed is more than 0.09 mm; the influence of cutting depth on roughness is a monotonous rising trend. It is concluded from the experimental results that ultrasonic vibration cutting can half the surface roughness and improve the machining quality of GFRP.