Surface Roughness Modeling In High Speed Turning Of Ti-6Al-4V Using Response Surface Methodology

Usage of titanium alloys has increased day by day in the field of bio medical, aerospace, marine and automobile industries because of its corrosion-resistance, high strength to weight ratio and fatigue resistance. Titanium and its alloys are considered as difficult to machine materials. In the present work, an attempt has been made to investigate the influence of cutting speed, feed rate, tool wear and cutting tool vibrations on two widely investigated and used surface roughness parameters namely R-a andR(t) during high speed turning of Ti-6Al-4V. The experiments have been conducted using uncoated carbide inserts. The surface roughness modeling has been done using Response Surface Methodology (RSM). RSM models (both first and second order) have been developed considering different combination of input parameters namely all parameters, ignoring cutting tool vibration and ignoring tool wear. The reason is to understand the influence of these two parameters on the RSM models developed. Second order models are better in modeling both R-a. and R-t as they exhibit higher values of correlation coefficient (R-2). Both R-a. and Rt increase with feed rate and cutting tool vibrations whereas increase in cutting speed and tool wear decreases the same. (C) 2017 Elsevier Ltd. All rights reserved.