Experimental and scale-span numerical investigations in conventional and longitudinal torsional coupled rotary ultrasonic–assisted drilling of CFRPs

Longitudinal torsional coupled rotary ultrasonic–assisted drilling (LTC-RUAD) technology is introduced to improve the surface roughness of hole-wall and solve tear, burr, delamination carbon fiber–reinforced polymers (CFRPs) induced by large thrust force torque during conventional (CD). An experiment scale-span numerical investigation CFRPs were presented for both CD LTC-RUAD processes in this study. A experimental platform using was built via a novel independently designed manufactured vibration actuator, while experiments involving T700S-12 K/YP-H26 CFRP specimens with different process parameters carried out adopting ultrasonic amplitude (UVA) longitudinal directions. Then, three-dimensional (3D) FE simulation model which applied UVA tapered drill-reamer (TDR) developed find more details about effects machining quality holes. Experimental results revealed that maximum average reduction observed be as high 30% under certain conditions, factor drilled hole shows “concave” trend increase UVA. The at exit best when Sr = 2000 rpm, Sf 0.01 mm/rev, Alon 7.02 ?m, Ator 9.29 ?m LTC-RUAD. only 0.054, damage factors are reduced 69.67% compared CD.