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 (V-c). The depth of the drilling was constant. Cutting temperature (T), thrust force (F-t), surface roughness (R-a), 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 (R-a) values were higher for LN2 coolants. Hole quality is not favorable in LN2 coolant supply.