Thick pointed superhard material
AssigneeSchlumberger Technology Corporation
InventorsDavid R. Hall, Ronald B. Crockett, Jeff Jepson, Scott Dahlgren, John Bailey
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Abstract
In one aspect of the invention, a high impact resistant tool includes a superhard material bonded to a cemented metal carbide substrate at a non-planar interface. The superhard material has a substantially pointed geometry with a sharp apex having a radius of curvature of 0.050 to 0.125 inches. The superhard material also has a thickness of 0.100 to 0.500 inches thickness from the apex to a central region of the cemented metal carbide substrate.
Claims28
A high impact resistant tool, comprising a cutting end extending a height from a grip region and a sintered polycrystalline diamond material bonded to a cemented metal carbide substrate at an interface, said diamond material at least partially forming the cutting end, the cutting end comprising:
- a side surface extending from an outer diameter of the grip region to an apex having a central axis, said central axis passing through said cemented metal carbide substrate, said apex having a radius of curvature from about 0.050 to about 0.160 inches measured in a vertical orientation from said central axis, the diamond material forming the side surface and the apex, and the thickness of the diamond material along the central axis from the interface to the apex being greater than the radius of curvature.
A high impact resistant tool, comprising:
- a sintered polycrystalline diamond material bonded to a cemented metal carbide substrate at an interface, said diamond material having a convex side surface extending in a general direction from an outer diameter of the diamond material and terminating in a rounded apex having a central axis therethrough, the apex being rounded in an axial direction,
- wherein the convex side surface has a convex cross sectional profile when viewed along a plane axially intersecting the central axis and forms a first angle from an axis parallel to the central axis in a lower portion of the sintered polycrystalline diamond material, a second angle from the axis in a middle portion of the sintered polycrystalline diamond material, and a third angle from the axis in an upper portion of the sintered polycrystalline diamond material;
- and
- wherein the convex side surface has a radius of curvature that is greater than a radius of curvature of the rounded apex.
Dependencies are inferred from the claim text.