| 摘要 |
In one aspect of the present invention, a drill bit has a body intermediate a shank and a working face. The working face has a plurality of blades converging towards a center of the working face and diverging towards a gauge of the working face. A first blade has at least one pointed cutting element with a carbide substrate bonded to a diamond working end with a pointed geometry at a non-planar interface and a second blade has at least one shear cutting element with a carbide substrate bonded to a diamond working end with a flat geometry.
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