Comparative study of machinability characteristics during machining nimonic c-263 with uncoated and cvd multicoated carbide inserts

摘要

Nickel base super alloy has the combined property of “high mechanical strength” and “High heat and corrosion resistance” at elevated temperature. This is the reason for which Nickel based super alloy are extremely used in 1. Aircraft gas turbine engine due to their superior mechanical property at an elevated temperature, 2. Aerospace component which continuously suffer from Extreme temperature, pressure and velocity for long period, 3. Submarine and chemical industries due to Superior Chemical properties like resistance to corrosion and oxidation, 4. Heat exchanger as subjected to high temperature. Super alloy are difficult to machine due to their high mechanical strength and low thermal conductivity resulting tool wear during machining. Work hardening occur rapidly during machining resulting notching. Chemical reaction occur at high cutting temperature produce diffusion wear during machine. Low thermal conductivity of super alloy results tool wear, which accelerate premature tool failure, short tool life, increase of cutting forces and poor quality of surface finish. NIMONIC is high temperature low-creep super alloy .Major constituents of NIMONIC is nickel , Chromium and cobalt which enhance the resistance to corrosion and oxidation for which NIMONIC got higher chemical property compared to Inconel in which (5-10)% iron concentration present. NIMONIC C-263 alloy has immense uses recent times as mentioned above hence it is necessary to study the machinability aspect of super alloy in order to enhance and productivity of the super alloy. Tool performance were studied ,when C-263 super alloy is machined under coated and uncoated carbide tool insert at dry condition .The operation were performed keeping feed (0.2mm/rev)and depth of cut (1mm) and varying cutting velocity (51-84)m/min