Abstract:
The research focuses on the machining performance of a Titanium Aluminum Silicon Nitride
(TiAlSiN) coated tungsten carbide tool during end milling of maraging steel C300. End milling
experiments are performed at various spindle speeds using uncoated tool, coated tool, shallow
treated coated tool and deep treated coated tool to determine surface roughness and characterize
cryogenic treated and untreated tools. The tool's Scanning Electron Microscope (SEM) image
can be used to determine the variation in surface characteristics. The Energy Dispersive X-ray
Spectroscopy (EDS) analysis can be used to get the composition of the coating. Using a 4 flute 6mm end milling tool in a Computer Numerical Control (CNC) milling machine, a slot with a
depth of 0.2mm is cut into the plate at a feed rate of 320mm/min. The process is carried out at
varying speeds of 1000, 2000, 3000, and 4000rpm. It has been observed that with an increase
in rpm, the surface roughness decreases in all cases. Better surface finish is observed in Shallow
Cryogenic Treatment (SCT6) tool followed by Deep Cryogenic Treatment (DCT24), untreated
coated tool and untreated uncoated tool. Variation in microhardness was measured using
Vickers hardness testing machine. Mass loss rate from the tool wear for three conditions has
been determined. SCT shows a reduction in mass loss rate and an increase in microhardness
compared to untreated and DCT.
