Attack tool with an interruption
View Patent ↗In one aspect of the present invention, a tool has a wear-resistant steel base comprising a shank suitable for attachment to a driving mechanism. A planar end of a cemented metal carbide segment brazed to an interfacial surface of the base axially opposed to the shank. At least one interruption is formed in the interfacial surface.
1. A degradation tool, comprising:
a steel base comprising a shank for attachment to a driving mechanism and a first surface opposite the shank;
a carbide segment with an impact tip attached thereto for degrading a formation and a second surface opposite the impact tip;
wherein the first surface and the second surface are brazed together to form an interfacial surface;
at least one cavity formed in the first surface and interrupting the interfacial surface; and
a smooth transition between the interfacial surface surrounding an opening of the at least one cavity and the second surface spanning the opening.
2. The tool of claim 1 , wherein the at least one cavity comprises a plurality of notches formed within the first surface.
3. The tool of claim 1 , wherein the at least one cavity comprises a width of 5 to 75 percent the diameter of the interfacial surface.
4. The tool of claim 1 , wherein the at least one cavity comprises a depth of 5 to 75 percent a height of an upper portion of the base.
5. The tool of claim 1 , wherein the interfacial surface is non-planar.
6. The tool of claim 1 , wherein the second surface is planar across an opening of the at least one cavity.
7. The tool of claim 1 , wherein the second surface is planar adjacent an opening of the at least one cavity.
8. The tool of claim 1 , wherein the interfacial surface proximate the at least one cavity forms a planar ring around an opening of the at least one cavity.
9. The tool of claim 1 , wherein the interfacial surface surrounding an opening of the at least one cavity is continuous with the second surface spanning the opening.
10. The tool of claim 1 , wherein the at least one cavity is centered on the first surface.
11. The tool of claim 1 , wherein the at least one cavity comprises a substantially tapering cross-sectional area.
12. The tool of claim 1 , further comprising at least one cavity formed in the second surface and interrupting the interfacial surface.
13. The tool of claim 1 , further comprising stop-off material limiting the interfacial surface.