Wear Characteristics of Various Diamond Tools in Cutting of Tungsten Carbide

Abstract

Face cutting of tungsten carbide was conducted using two monocrystalline diamond tools and three polycrystalline diamond tools to investigate the wear characteristics in terms of the crystal structure and composition of the diamond. It was found that the wear of the monocrystalline diamond tool depends on the crystal planes that form the rake face and flank face of the cutting tool, and a cleavage fracture occurs when the cutting force acts as a shear force on the (111) crystal plane. The binderless nano-polycrystalline diamond tool exhibits excellent wear resistance beyond those of the sintered polycrystalline diamond tool and chemical vapour deposition polycrystalline diamond tool, as well as better wear resistance than the monocrystalline diamond tool.

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

“…The minimum roughness R a is 38 nm at α s = -30°. Figure 10 shows the wear of the cutting edge t w plotted against the cutting length L i for the four cutting tools in the case of continuous cutting (Kubo et al, 2011). From Figure 9, it is found that the WC workpiece is mirror-finished and it is confirmed that ductile-mode cutting was realised because striae parallel to the cutting direction, which were due to the plastic flow of the workpiece material, were found in the SEM image.…”

Performance of Newly Developed Single-Point Diamond Dresser in Terms of Cutting-Point Rake Angle

“…Figure 1 shows optical images of the cutting-tool-type dresser. Binderless nano-polycrystalline diamond (NPD) [6] synthesized from graphite by direct conversion under ultrahigh pressure at a high temperature was prepared as the dresser material on the basis of experimental results obtained by the authors [7]; that is, the NPD exhibits excellent wear resistance compared with other diamond materials in the cutting of tungsten carbide. The tip of the cutting-tool-type dresser is a trapezoid of 50 µm width, and both the back rake angle and side rake angle are set at 0 deg., so that a tilting bed can be inserted between the cutting-tool-type dresser and the dresser holder, thereby enabling the actual rake angle to be adjusted in the negative direction.…”

Effect of Cutting Fluid on Diamond Tool Life under Micro V-Groove Turning of Cobalt-Free Tungsten Carbide

“…In each test on various work materials, NPD tools demonstrated significantly high cutting performance compared with both conventional polycrystalline diamond tools and mono-crystalline diamond tools, indicating that NPD holds great promise in applications for various cutting and processing tools [2]. Furthermore, Tamaki and group made cutting tests using a diamond tool with different rake angles that clearly indicated that a -30° rake angle tool resulted in the longest tool life [3].…”