Title: Multi objective optimisation of machining parameters during high speed drilling of Ti6Al4V alloy under dry condition

Authors: V. Krishnaraj; R. Sindhumathi; A. Prabukarthi; S. Harichealvan

Addresses: PSG College of Technology, Coimbatore-641004, Tamil Nadu, India ' PSG College of Technology, Coimbatore-641004, Tamil Nadu, India ' PSG College of Technology, Coimbatore-641004, Tamil Nadu, India ' PSG College of Technology, Coimbatore-641004, Tamil Nadu, India

Abstract: Ti6Al4V alloys have been used widely as engineering materials in aerospace and marine applications though it is hard-to-machine. Drilling is an important machining process as it is frequently required for assembly. The objective of this paper is to investigate the machining parameters during high speed drilling of titanium alloy. The experiments are conducted based on Taguchi L₁₆ orthogonal array using carbide drill of Φ6 mm. The output parameters such as thrust force, torque, specific cutting pressure and power were analysed and optimised using multi-objective optimisation technique (TOPSIS) to identify the optimum parameters. The results show that feed significantly influences the above mentioned responses. It was also seen that specific cutting pressure decreases with increase in feed rate during high speed drilling. The optimised cutting conditions found from the experiments are cutting speed of 75 m/min and feed of 0.015 mm/rev.

Keywords: Ti6Al4V; high speed drilling; thrust force; torque; specific cutting pressure; power; TOPSIS.

DOI: 10.1504/IJMATEI.2018.096042

International Journal of Materials Engineering Innovation, 2018 Vol.9 No.3, pp.195 - 207

Received: 25 Oct 2017
Accepted: 05 Feb 2018
Published online: 09 Nov 2018 *

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