In this present work AA7075 ALUMINIUM alloy was machined by turning operation with different cutting tools such as uncoated- Aluminium grade, WC PVD, WC CVD coated tool insert under dry cutting environment. Effect of spindle speed was studied for each of the cutting tools was regards to the surface finish of the work piece and chip morphology and also experimentally studied the tool characterization while approaching SEM and EDX analysis. It is observed that the surface roughness is decreases with increasing cutting speed. The chip formed were continuous but varied in size and shape depending upon the machining parameters and the formed have been studied under electronic tool maker’s microscope. At all cutting conditions WC PVD coated tool insert is the better cutting tool as per the considered machining parameters to achieve better surface roughness and tool wear.
Keywords : AA7075, Dry Machining, CVD, PVD, Surface Roughness, Toolmaker’s Microscope, SEM, EDX, Chip Morphology.