Effect of Feed Rate On Difficult to Cut Metals on Surface Roughness and Tool Wear Using Surface Treated and Untreated Tools

Machining is a process of removing unwanted material by the effective use of cutting tools to reduce the lead time. The material like Titanium, Stain steel and Inconel are considered difficult to cut metals. The difficult to cut metals require tough cutting edges to reduce the tool wear and to get smooth surface finish and product size. The cutting tools are required to be tough enough to resist wear by surface treatment like cryogenic treatment. In this research, CBN cutting inserts was used. The CBN tools was kept in nitrogen atmosphere at-176 degree centigrade in closed chamber for more than 36 hours to produce tough cutting edge, which is known as cryogenic process. In this research, treated CBN cutting tools used to turn Titanium and Inconel 718 materials. The operating parameters used were cutting speeds of 30, 40 and 50 m/min, feed rates of 0.05, 0.10 and 0.15 mm /rev and depths of cut of 0.5, 0.75 and 1.00 mm. The treated cutting inserts produced less flank wear and smooth surface roughness compared to un-treated tools. The crater wear is not in the scope of this research. (C) 2019 The Authors. Published by Elsevier Ltd.