Degradation assembly
View Patent ↗In one aspect of the invention, a tool has a working portion with at least one impact tip brazed to a carbide extension. The carbide extension has a cavity formed in a base end and is adapted to interlock with a shank assembly of the cutting element assembly. The shank assembly has a locking mechanism adapted to interlock a first end of the shank assembly within the cavity. The locking mechanism has a radially extending catch formed in the first end of the shank assembly. The shank assembly has an outer surface at a second end of the shank assembly adapted to be press-fitted within a recess of a driving mechanism. The outer surface of the shank assembly has a coefficient of thermal expansion of 110 percent or more than a coefficient of thermal expansion of a material of the driving mechanism.
1. A high impact resistant tool tip, comprising:
a cylindrical cemented metal carbide substrate having a first volume, a central axis, a base surface, a non-planar upper surface opposing said base surface, a cylindrical rim, and a substrate thickness between said base surface and said upper surface, said non-planar upper surface tapering from said cylindrical rim towards said central axis; and
a superhard material bonded to said upper surface, said superhard material having a conical geometry with a second volume greater than said first volume, an apex at a distal end of said superhard material, an interface surface opposing said apex, said interface surface being complementary to said non-planar upper surface, and an apex thickness between said apex and said interface surface, said apex thickness being at least 1.5 times as great as said substrate thickness.
2. The high impact resistant tool tip of claim 1 , wherein said superhard material is selected from the group consisting of diamond, polycrystalline diamond, natural diamond, synthetic diamond, vapor deposited diamond, silicon bonded diamond, cobalt bonded diamond, thermally stable diamond, polycrystalline diamond with a binder concentration of 1 to 20 weight percent, infiltrated diamond, layered diamond, monolithic diamond, polished diamond, course diamond, fine diamond, cubic boron nitride, diamond impregnated matrix, diamond impregnated carbide, and metal catalyzed diamond.
3. The high impact resistant tool tip of claim 1 , wherein said superhard material comprises infiltrated diamond.
4. The high impact resistant tool tip of claim 1 , wherein said superhard material has a metal catalyst concentration of less than 5 percent by volume.
5. The high impact resistant tool tip of claim 1 , wherein said superhard material has an average diamond grain size of between 1 micron and 100 microns.
6. The high impact resistant tool tip of claim 1 , wherein said second volume is between 75% and 175% of said first volume.
7. The high impact resistant tool tip of claim 1 , wherein said apex thickness is between 0.190 inch and 0.290 inch.
8. The high impact resistant tool tip of claim 1 , wherein said apex thickness and said substrate thickness have a total thickness between 0.200 inch and 0.500 inch.
9. The high impact resistant tool tip of claim 1 , wherein said apex has a radius between 0.650 inch and 0.950 inch.
10. The high impact resistant tool tip of claim 1 , wherein the high impact resistant tool tip is incorporated in drill bits, shear bits, percussion bits, roller cone bits or combinations thereof.
11. The high impact resistant tool tip of claim 1 , wherein said apex of said conical geometry has an included angle between 50 degrees and 80 degrees.
12. The high impact resistant tool tip of claim 11 , wherein said apex has an included angle and said tool has a total thickness between said apex and said base surface, wherein said tool has a ratio between said included angle and said total thickness between 160 degrees per inch and 280 degrees per inch.
13. The high impact resistant tool tip of claim 11 , wherein said apex has an included angle, wherein said tool has a ratio between said included angle and said apex thickness between 240 degrees per inch to 440 degrees per inch.
14. The high impact resistant tool tip of claim 1 , wherein said superhard material is leached of a catalyzing material to a depth no greater than at least 0.5 mm from said working surface of said superhard material.
15. The high impact resistant tool tip of claim 14 , wherein a depth of at least 1 mm from said working surface has a catalyzing material concentration of between 5 percent and 0.1 percent by volume.
16. The high impact resistant tool tip of claim 1 , wherein said apex thickness is at least 2 times said substrate thickness.
17. The high impact resistant tool tip of claim 1 , wherein said superhard material comprises a monolayer of diamond.
18. The high impact resistant tool tip of claim 1 , wherein said cemented metal carbide substrate is brazed to an extension.