The Effect of Cutting Paramaters on The Hole Quality and Tool Wear During The Drilling of Inconel 718

In this study the effect of cutting parameters on the hole quality (circularity and hole diameter) and tool wear during the drilling of super alloy Inconel 718 with coated and uncoated carbide drills was investigated. Drilling tests were carried out with uncoated and TiN and TiAlN coated carbide drills of 5 mm diameter using a CNC vertical machining center under dry cutting conditions by drilling blind holes of 8 mm depth and employing four different cutting speeds (10, 12.5, 15, 17.5 m/min) and three different feed rates (0.05, 0.075, 0.1 mm/rev). Regarding hole diameters and the circularity measurements a comparison has been made in terms of the quality of the hole between cutting tools. It was observed that there was a decrease of tool performance and hole quality at high cutting speed and feed rate combinations. A serious increase in tool wear was observed when increasing cutting speed. The Utmost wear type was seen in the form of flank wear and chisel edge wear.