发明申请
US20080314647A1 Rotary Drag Bit with Pointed Cutting Elements 有权
旋转拖动位与点切割元素

Rotary Drag Bit with Pointed Cutting Elements
摘要:
In one aspect of the invention a rotary drag bit has a bit body intermediate a shank and a working surface. The working surface has a plurality of blades converging at a center of the working surface and diverging towards a gauge of the working surface. At least one blade has a cutting element with a carbide substrate bonded to a diamond working end with a pointed geometry. The diamond working end has a central axis which intersects an apex of the pointed geometry such that the axis is oriented within a 15 degree rake angle.
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