Back to results
US 5,492,188 AGranted
Stress-reduced superhard cutting element
AssigneeBaker Hughes Incorporated
InventorsRedd H. Smith, Arthur A. Chaves
Life of this patent
Estimating the term…
Abstract
A cutting element suitable for incorporation in a drill bit used for earth drilling is disclosed which comprises an abrasive layer of superhard material formed on a substrate support, the substrate and/or the abrasive layer being structurally modified to reduce and/or redistribute detrimental tensile stresses which occur at the periphery of the abrasive layer and at or near the interface between the abrasive layer and the substrate, and within the body of the substrate. The modified cutting element structure reduces the occurrence of fracturing and cutter degradation.
Claims39
A cutting element for use in an earth drilling bit comprising:
- an abrasive layer of superhard material structured with a first surface for contacting
- an earth formation, having a selected thickness, and having a peripheral zone
- about said first surface;
- and a substrate body providing support for said abrasive layer, said substrate body having
- a central axis, an interfacial surface to which is attached said abrasive layer and a circumferential profile, said substrate body having a modified portion positioned at or about said central axis and oriented perpendicular to said first surface.
2 more elements
A cutting dement for use in an earth drilling bit comprising:
- an abrasive layer of superhard material structured with a first surface for contacting an earth formation, having a selected thickness, and having a peripheral zone about said first surface;
- and
- a substrate body providing support for said abrasive layer, said substrate body having an interfacial surface to which is attached said abrasive layer, a substantially planar surface spaced apart from and parallel to said interfacial surface and a circumferential profile, said substrate body having a modified portion including at least one depression formed in one end of said substrate body parallel to said interfacial surface and at least one metal disk sized to be received within said at least one depression concentric to said substrate body.
A cutting element for use in an earth drilling bit comprising:
- an abrasive layer of superhard material structured with a first surface for contacting an earth formation and having a selected thickness, a peripheral zone about said first surface, and a modified portion positioned proximate said peripheral zone and distanced apart from the center of said abrasive layer;
- and
- a substrate body providing support for said abrasive layer, said substrate body having an interfacial surface to which is attached said abrasive layer, an opposing substantially planar surface, a circumferential profile and a projecting portion of substrate material which extends outwardly from said interfacial surface into said abrasive layer formed on said interfacial surface, said projecting portion of said substrate material forming said modified portion of said abrasive layer.
A cutting element for use in an earth drilling bit comprising:
- an abrasive layer of superhard material structured with a first surface for contacting an earth formation, having a selected thickness, a periphery, and a central axis, said abrasive layer having a modified portion positioned about said central axis;
- and
- a substrate providing support for said abrasive layer, said substrate having an interfacial surface to which is attached said abrasive layer, a circumferential profile, and a central longitudinal axis, said interfacial surface of said substrate being modified about said central longitudinal axis to provide a solid core of substrate material surrounded by said superhard material, said abrasive layer extending from proximate said central longitudinal axis to said circumferential profile and being coextensive with said interfacial surface.
A cutting element for use in an earth drilling bit comprising:
- a substrate for supporting an abrasive superhard material thereon, said substrate having an interfacial surface to which a layer of said abrasive superhard material is formable, a substantially planar surface spaced apart from and parallel to said interfacial surface, a circumferential profile extending between said interfacial and substantially planar surfaces, and an annular zone positioned proximate said interfacial surface which is structured to redistribute residual tensile stresses occurring proximate an interface between said layer of abrasive superhard material and said interfacial surface of said substrate;
- and
- an abrasive layer formed to said substrate on said interfacial surface.
A cutting element for use in an earth drilling bit comprising:
- an abrasive layer of superhard material structured with a first surface for contacting an earth formation, having a selected thickness, and having a peripheral zone about said first surface;
- and
- a substrate body providing support for said abrasive layer, said substrate body having an interfacial surface to which is attached said abrasive layer, a substantially planar surface spaced apart from and parallel to said interfacial surface and a modified portion positioned in parallel orientation to said interfacial surface, said substrate body further comprising a thickness of metal material positioned adjacent a thickness of hard material, said abrasive layer being attached adjacent said thickness of hard material.
A cutting element for use in an earth drilling bit comprising:
- an abrasive layer of superhard material structured with a first surface for contacting an earth formation and having a selected thickness, a peripheral zone about said first surface, and a modified portion positioned proximate said peripheral zone, said abrasive layer comprising a layer of metal material sandwiched between two layers of said superhard material, said metal material being positioned to concentrate residual tensile stresses therein;
- and
- a substrate body providing support for said abrasive layer, said substrate body having an interfacial surface to which is attached said abrasive layer, an opposing substantially planar surface and a circumferential profile.
Dependencies are inferred from the claim text.