Abstract
A shear tool tip comprising a thick polycrystalline diamond film brazed to the tool substrate was made and subjected to a shearing test in order to check the feasibility of using diamond coatings made by chemical vapor deposition on shearing tools. The material to be sheared by this diamond tool was a reel of polishing tape coated with very hard SiC particles which cause severe wear on the shearing tool. The shearing experiment was continued until the tool was worn away to a point where it could no longer sever the work material. The tool life was tested against that of two other tool materials for the purposes of comparison. The results showed that the life of the shearing tool with brazed on diamond film was 100 times longer than that of a tungsten carbide alloy tool and four times longer than that of a sintered diamond tool.
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