Study of Surface Integrity in Turning Ti-Alloy Using Optimal Depth of Cut

Surface integrity is one of the most relevant parameters used for evaluating the quality of machined surfaces for any industrial application. Significant surface defect can cause dangerous failure of machine element or at least reduce the service life significantly. Although, titanium alloy is a promising material for producing aircraft structural and engine components for high reliability, it is difficult to machine as well as difficult to achieve desired surface quality. Each of the turning parameters such as cutting speed, feed rate, depth of cut affects the machined surface quality with different level of contribution. The main objective of this research is to investigate the influence of depth of cut on surface finish keeping other parameters constant. Slots on Ti-alloy shaft were turned with varying depth of cut to generate surfaces with different surface roughness. Taylor-Hobson roughness measuring device was used to measure the surface roughness. The results of optimum surface roughness value are found to be 0.40 µm for depth of cut 0.50 mm for constant cutting speed and feed rate 81.05 m/min and 0.055 mm/rev respectively.