One-Step High-Speed Finish Drilling of Inconel 718 Superalloy via Novel Inserts

Inconel 718 is considered the most widely adopted nickel-based superalloy, and drilling of this alloy always challenging for researchers. Cemented carbide twist drills have been evaluated in by changing cutting environment or varying tool geometry. In latter case, speed has extended from 30 m/min to 60 when are micro-textured ground. study, contrary cemented drills, first time, inserts named stepped (central) peripheral (wiper) alloy. The central insert designed balanced forces, while a wiper better surface finish. Drilling experiments conducted flood cooling conditions with 12 mm diameter drill equipped novel at speeds (25, 35, 45 m/min) feed rates (0.04, 0.06, 0.08 mm/rev). At (Vc) 25 rate (f) 0.04 mm/rev, holes drilled roughness (Ra) values ranging 0.40 µm 0.60 µm, which represents significant increase number per improved finish over previous work. new showed almost three-fold longer life compared standard bit higher Vc mm/rev f an Ra between 0.22 0.43 deemed acceptable aerospace applications. addition, minimal sub-surface defects were observed, eliminating need post-drilling finishing operation; therefore, one-step operation was achieved.