Title: Wear characteristics of nano-polycrystalline diamond tool in cutting of tungsten carbide

Authors: Jun'ichi Tamaki; Akihiko Kubo; A.M.M. Sharif Ullah

Addresses: Department of Mechanical Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido 090-8507, Japan ' Department of Mechanical Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido 090-8507, Japan ' Department of Mechanical Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido 090-8507, Japan

Abstract: Nano-polycrystalline diamond is a binderless diamond synthesised by the direct conversion of graphite under high pressure and high temperature. This diamond has the same or higher hardness than synthesised monocrystalline diamond and is expected to be an effective material for cutting tools. In this study, the cutting of tungsten carbide was conducted using two monocrystalline diamond tools, a chemical vapour deposition (CVD) diamond tool and a nano-polycrystalline diamond tool to investigate their wear characteristics in terms of the diamond structure and composition. A supply of chemical solution coolant resulted in a stable machined surface, and a negative back rake angle of 30° was shown to provide the minimum tool wear and machined surface roughness. The nano-polycrystalline diamond tool shows excellent wear resistance superior to those of the two monocrystalline diamond tools and CVD diamond tool in continuous cutting as well as better wear resistance than the CVD diamond tool in intermittent cutting.

Keywords: cutting tools; tungsten carbide; monocrystalline diamond; CVD diamond; chemical vapour deposition; binderless nano-polycrystalline diamond; back rake angle; coolant supply; continuous cutting; intermittent cutting; wear resistance; back rake angle; surface roughness.

DOI: 10.1504/IJMMS.2014.067155

International Journal of Mechatronics and Manufacturing Systems, 2014 Vol.7 No.4/5/6, pp.227 - 245

Received: 02 Nov 2013
Accepted: 10 Mar 2014
Published online: 07 Feb 2015 *

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