| 摘要 |
<p>Blades (12,35) with tungsten carbide cutting edges (17,36) have a surface at a relief angle ( alpha ) and a surface at a reverse angle ( beta ) at the periphery. A smooth crown is provided at the intersection of the surfaces. The crown will be included within an overlap of a cooperating offset steel blade (11,31). The relief angle ( alpha ) may be between about 1 and 3 degrees and the reverse angle ( beta ) about 1/4 to 1 degree. The crown may have a finish of about 2-6 micro-inches. The contact between the blades during operation provides a polishing or self-sharpening effect. The tungsten carbide blades are used in rotating shear wheel devices and scissor cutting devices to cut tire cord fabric. <IMAGE></p> |
