Study on drilling of CFRP/Ti6Al4V stack with modified twist drills using acoustic emission technique

On the interpretation of drilling CFRP/Ti6Al4V stacks using the orthogonal cutting method: Chip removal mode and subsurface damage formation

“…Park et al [7] found that abrasion caused by the carbon fibers as well as the titanium adhesion was the key tool wear patterns during drilling of CFRP/Ti6Al4V stacks. Prabukarthi et al [8] evaluated the performance of different modified twist drills in drilling CFRP/Ti6Al4V stacks using the acoustic emission technique. The authors found that both the helix and point angles were the key factors affecting the tool performance, and drills with a high helix angle and a low point angle could produce the lowest thrust forces while drilling the composite/metal stacks.…”