Title: Optimisation and tool life study in drilling of titanium (Ti-6Al-4V) alloy

Authors: Arumugam Prabukarthi; Vijayan Krishnaraj; Murugan Santhosh; Mouleeswaran Senthilkumar; Redouane Zitoune

Addresses: PSG College of Technology, Coimbatore, 641004, India ' PSG College of Technology, Coimbatore, 641004, India ' PSG College of Technology, Coimbatore, 641004, India ' PSG College of Technology, Coimbatore, 641004, India ' Institut Clément Ader, 'INSA, UPS, Mines Albi, ISAE', Université de Toulouse, 133 c Avenue de Rangueil, 31077 Toulouse, cedex 04, France

Abstract: Titanium and its alloys are attractive materials due to their unique high strength-weight ratio that is maintained at elevated temperatures. Ti-6Al-4V alloy are notorious for their poor thermal properties and are classified as difficult-to-machine materials. Drilling is an important machining process since it is involved in nearly all titanium applications. It is desirable to develop optimised drilling processes for Ti and/or improve the hole characteristics such as hole diameter, circularity and exit burr of currently available processes. Due to the low machinability of the alloy under study, selecting the machining conditions and parameters is crucial. The hole quality, thrust force, torque and exit burr were evaluated at various spindle speeds, feed rates combinations. The optimised parameter is chosen using the multi-objective weighted sum optimisation technique. The tool life for the optimised parameter was studied and the life of the carbide drill was observed to be 140 holes in drilling of titanium.

Keywords: drilling; tool life; multiobjective optimisation; titanium alloys; hole diameter; circularity; exit burr; hole quality; thrust force; torque; spindle speed; feedrate; carbide drills.

DOI: 10.1504/IJMMM.2013.053219

International Journal of Machining and Machinability of Materials, 2013 Vol.13 No.2/3, pp.138 - 157

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 12 Apr 2013 *

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