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

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.Reference to this paper should be made as follows: Tamaki, J., Kubo, A. and Ullah, A.M.M.S. (2014) 'Wear characteristics of nano-polycrystalline diamond tool in cutting of tungsten carbide', Int.

A Surface Generation Mechanism of Grinding

“…As mentioned before, the shape of the abrasive grains are highly stochastic in nature [3][4] creating uneven heights of the cutting edges located on the outermost circumferential surface of a grinding wheel. The same argument holds for the wear/truncation of the abrasive grains (e.g., see the work [14] where the authors have reported the experimental results showing the randomness in the wear of the materials (cBN and diamond) used to produce the abrasive grains [1][2]). As a result, one can use the abrasive grains' wear, truncation, loss, and shape-relevant stochastic information to create the uneven heights of the grains.…”