Title: Chip segmentation behaviour and surface topography in high-speed turning of titanium alloy (Ti-6Al-4V) with eco-friendly water vapour
Authors: Raju S. Pawade; D.S.N. Reddy; Ganesh S. Kadam
Addresses: Department of Mechanical Engineering, Dr. Babasaheb Ambedkar Technological University, Lonere, Raigad 402 103, India ' Department of Mechanical Engineering, M.H. Saboo Siddik College of Engineering, Byculla, Mumbai 400 008, India ' Department of Mechanical Engineering, Dr. Babasaheb Ambedkar Technological University, Lonere, Raigad 402 103, India
Abstract: In this paper, a new eco-friendly approach of use of water vapour cooling is presented to machine titanium alloy (Ti-6Al-4V) at higher cutting speed. A plain turning operation was carried out for three different cutting speeds (60, 120, 180 m/min) and feedrates (0.08, 0.16, 0.32 mm/rev) with constant depth of cut. The machining performance is evaluated in terms of chip thickness ratio, chip segmentation frequency, surface roughness and surface damage. The experimental study revealed that at higher cutting speed the chips become more ductile and show continuous morphology with serrated tooth because of increased temperature of shear zone and concentrated shear in the deformation zone. It is observed that chip thickness ratio and cross sectional area of the chip is increased with an increase in feedrate for all cutting speeds. The surface finish was improved when snarled and ribbon type chips are formed. Pitch of the chip is decreased as the cutting speed increases for all the feedrates. A significant change in surface roughness was found at different feedrates as compared to cutting speed. A variety of surface alterations are found which vary according to machining conditions.
Keywords: high speed turning; water vapour coolant; chip segmentation frequency; surface roughness; scanning electron microscopy; SEM; chip segmentation behaviour; surface topography; high speed machining; titanium alloys; surface quality; eco-friendly cooling; cutting speed; feedrate; chip thickness ratio; surface damage; surface finish; temperature; deformation.
International Journal of Machining and Machinability of Materials, 2013 Vol.13 No.2/3, pp.113 - 137
Received: 08 May 2021
Accepted: 12 May 2021
Published online: 12 Apr 2013 *