Experimental Study of Machining Characteristics of Titanium Alloy (Ti-6A1-4V)

摘要

In this article, machining characteristics of titanium alloy grade-5 (Ti-6Al-4V) have been examined at different cutting speeds, feed rates and approaching angles under dry condition. It has been observed that with the increase in cutting speeds, the magnitude of cutting forces and tool tip temperature increase. If both cutting force and temperature level were considered together, the optimum approaching angle works out to be 45° and 90° for 49.5 and 76.7 m/min, respectively. For 116.9 m/min increase of cutting forces at 60° approaching angle can be attributed to low-shear angle which is function of the average chip thickness. Positive rake angle produces higher shear angle which leads to the reduction of cutting forces, tool tip temperature and thus help obtaining a better surface finish. Surface roughness measurements obtained prior and subsequent to the machining of titanium alloy (Ti-6Al-4V) were used to characterize the change in roughness caused by variation in machining parameters like cutting speed, feed rate and approaching angle. The average surface roughness is observed to be maximum at 0.11 mm/min and minimum at 0.04 mm/min feed rate for all approaching angles.