Cutting elements configured to reduce impact damage and related tools and methods

Patent metadata

Field	Value
Publication number	US-10400517-B2
Application number	US-201715584943-A
Country	US
Kind code	B2
Filing date	May 2, 2017
Priority date	May 2, 2017
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

Cutting elements for earth-boring tools may include a substrate and a polycrystalline, superabrasive material secured to an end of the substrate. The polycrystalline superabrasive material may include a first transition surface extending in a direction oblique to a central axis of the substrate, a second transition surface extending in a second direction oblique to the central axis, the second direction being different from the first direction, and a curved, stress-reduction feature located on the second transition surface.

First claim

What is claimed is:

1. A cutting element for an earth-boring tool, comprising:
a substrate; and
a polycrystalline, superabrasive material secured to an end of the substrate, the polycrystalline superabrasive material comprising:
a first transition surface extending in a first direction oblique to a central axis of the substrate;
a second transition surface extending in a second direction oblique to the central axis, the second direction being different from the first direction; and
a curved, stress-reduction feature located on the second transition surface, the curved, stress-reduction feature comprising a waveform extending around a circumference of the second transition surface, a surface of the waveform positioned to engage with an underlying earth formation and extending radially from the second transition surface toward the central axis tapered away from the substrate, the surface of the waveform extending from the second transition surface to a planar surface of the polycrystalline located at a same distance from the substrate as peaks of the waveform surface, the planar surface oriented perpendicular, and located proximate, to the central axis.

2. The cutting element of claim 1 , wherein a frequency of the waveform is between one every 180° and ten every 90°.

3. The cutting element of claim 1 , wherein a maximum thickness of the second transition surface as measured in a direction parallel to the central axis is between 0.01 inch and 0.05 inch.

4. An earth-boring tool, comprising:
a body; and
a cutting element secured to the body, the cutting element comprising:
a substrate; and
a polycrystalline, superabrasive material secured to an end of the substrate, the polycrystalline superabrasive material comprising:
a first transition surface extending in a first direction oblique to a central axis of the substrate;
a second transition surface extending in a second direction oblique to the central axis, the second direction being different from the first direction; and
a curved, stress-reduction feature located on the second transition surface, the curved, stress-reduction feature comprising a waveform extending around a circumference of the second transition surface, a surface of the waveform positioned to engage with an underlying earth formation and extending radially from the second transition surface toward the central axis tapered away from the substrate, the surface of the waveform extending from the second transition surface to a planar surface of the polycrystalline located at a same distance from the substrate as peaks of the waveform surface, the planar surface oriented perpendicular, and located proximate, to the central axis.

5. The earth-boring tool of claim 4 , wherein a frequency of the waveform is between one every 180° and ten every 90°.

6. The earth-boring tool of claim 4 , wherein a maximum thickness of the second transition surface as measured in a direction parallel to the central axis is between 0.01 inch and 0.05 inch.

Assignees

• Baker Hughes A Ge Co Llc

Inventors

• Borge Richard Wayne

Classifications

• E21B10/573

  characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element · CPC title

• E21B10/44

  Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts (E21B10/42 takes precedence) · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• B22F7/062

  involving the connection or repairing of preformed parts · CPC title

• B22F7/08

  with one or more parts not made from powder {(B22F7/062 takes precedence)} · CPC title