| 摘要 |
An improved circular saw blade designed for cutting fiber cement workpieces, which are becoming more and more prevalent on the construction site, includes a PCD/carbide tip ( 16 ) mounted in the rim ( 31 ) of the saw blade ( 10 ) at six, rather than the usual for locations, equally spaced around the blade. The tips are mounted adjacent a relatively large-diameter, semi-circular gullet ( 20 ), which itself is preceded by a chip and dust minimizer ( 18 ). The minimizer includes several alternating hills ( 52 ) and valleys ( 54 ) formed in the rim of the saw blade, each hill and valley having the same radius, producing a sinuous array essentially centered on the rim of the blade. It has been discovered that such a dust and chip minimizer reduces the level of dust and chips produced by the blade and clears the same from the kerf generated in the blade-workpiece interface. Ideally, all of the parameters and relief angles for the surfaces on the saw blade tip can be generated by cutting an array of such tips from a large-diameter blank ( 110 ) of PCD fused to a layer of tungsten carbide ( 72 ), and by mounting the tips onto the blade in such an orientation as to present, preferably, a negative hook or rake angle ( 74 ) to the workpiece.
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