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Experimental Investigations on Cryogenic Cooling in the Drilling of Titanium Alloy

In this study, a drilling experiment was conducted on titanium ASTM B265 Grade 2 material using PVD coated carbide inserts. Two types of coolants (Wet and LN2) were used. The variables in the experiment were feed rate (f) and cutting speed (Vc). The depth of the drilling was constant. Cutting temperature (T), thrust force (Ft), surface roughness (Ra), and the hole quality (circularity, cylindricity, and perpendicularity) were analyzed. The tool wear and chip morphology were studied. The result of the experiment indicates that there is 6–59% reduction in cutting temperature when LN2 is used, high thrust force values were recorded for LN2 coolant condition, surface roughness (Ra) values were higher for LN2 coolants. Hole quality is not favorable in LN2 coolant supply.