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

• US 10,400,517 B2
• Filed: 05/02/2017
• Issued: 09/03/2019
• Est. Priority Date: 05/02/2017
• Status: Active Grant

• Current Assignee: Baker Hughes Holdings LLC (Baker Hughes Company)
• Original Assignee: Baker Hughes, a GE Company, LLC (Baker Hughes Company)
• Inventors: Borge, Richard Wayne
• Primary Examiner(s): Gay, Jennifer H
• Application Number:
  US15/584,943
• Publication Number:
  US 20180320450A1
• Time in Patent Office: 854 Days
• CPC Class Codes: B22F 2005/001 Cutting tools, earth boring or grinding tool other than table ware
• CPC Class Codes: B22F 2999/00 Aspects linked to processes or compositions used in powder metallurgy
• CPC Class Codes: B22F 7/062 involving the connection or repairing of preformed parts
• CPC Class Codes: B22F 7/08 with one or more parts not made from powder B22F7/062 takes precedence
• CPC Class Codes: C22C 26/00 Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
• CPC Class Codes: C22C 29/10 based on titanium carbide
• CPC Class Codes: E21B 10/44 Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts E21B10/42 takes precedence
• CPC Class Codes: E21B 10/46 characterised by wear resisting parts, e.g. diamond inserts
• CPC Class Codes: E21B 10/5673 having a non planar or non circular cutting face
• CPC Class Codes: E21B 10/5676 having a cutting face with different segments, e.g. mosaic-type inserts
• CPC Class Codes: E21B 10/573 characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element

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.

Claims

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.