Title: Investigating wear mechanisms of CBN and mixed-ceramic tools during finish hard turning of low-medium hardness AISI H11 steel

Authors: J.S. Dureja, V.K. Gupta, Vishal S. Sharma, Manu Dogra

Addresses: University College of Engineering, Punjabi University, Patiala 147002, Punjab, India. ' University College of Engineering, Punjabi University, Patiala 147002, Punjab, India. ' Department of Industrial and Production Engineering, Dr. B.R. Ambedkar National Institute of Technology, Jalandhar 144011 Punjab, India. ' Department of Mechanical Engineering, Swami Sarvanand Giri Regional Centre, Punjab University, P.O. Allahabad Hoshiarpur 146001 Punjab, India

Abstract: The principal aim of this paper is to identify the wear mechanisms of CBN and mixed-ceramic tools during finish hard turning of low to medium hardness (42-52 HRC) AISI H11 steel under different machining conditions. The effect of machining parameters viz. cutting speed, feed rate, depth of cut and work hardness on wear pattern of these tools have been investigated. The prominent wear modes observed for CBN tool are abrasion wear, formation of transferred layer resulting from tribochemical reactions between constituents of tool, and workpiece material, built up edge, adhesion of workpiece material followed by plastic deformation and notching clearly visible at low workpiece hardness (47 HRC). The different wear mechanisms observed for mixed ceramic tool are abrasion wear, notch wear, chipping and brittle fractures of tool surface due to rubbing and impingement of hard particles in the work material, built up edge and adhesion followed by plastic deformation. The tool wear was characterised through optical microscopy and scanning electron microscope accompanied with energy dispersive analysis through X-ray.

Keywords: CBN tooling; mixed ceramic tools; AISI H11 steel; tool wear; cubic boron nitride; hard turning; machining parameters; cutting speed; feed rate; depth of cut; work hardness.

DOI: 10.1504/IJMMM.2011.040859

International Journal of Machining and Machinability of Materials, 2011 Vol.10 No.1/2, pp.120 - 136

Published online: 26 Jun 2011 *

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