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US 5,355,969 AGranted
Composite polycrystalline cutting element with improved fracture and delamination resistance
AssigneeUS Synthetic Corporation
InventorsJohn W. Hardy, Bill J. Pope, Kevin G. Graham, Robert J. Farr
Life of this patent
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Abstract
A cutting implement formed from a substrate of carbide, or other hard substance, bonded to a polycrystalline layer which serves as the cutting portion of the implement. The interface between the substrate and polycrystalline layer is defined by surface topography with radially spaced-apart protuberances and depressions forming smooth transitional surfaces.
Claims15
A cutting element comprising:
- a substrate having a support surface formed with alternating protuberances and depressions spaced-apart in a radial direction from the center wherein the bottoms of the depressions are concave, and
- a polycrystalline material layer having a cutting surface and an opposed mounting surface, the mounting surface having depressions and protuberances complementary to and in contact with the protuberances and depressions of the support surface, said mounting surface being joined to the said support surface.
A cutting element comprising:
- a substrate having a perimeter, a central axis, and a support surface, wherein the support surface is formed with alternating upwardly and downwardly projecting deformities spaced apart at intervals between the central axis and the perimeter;
- said upwardly projecting deformities having tops and sides having intersections therebetween which form radii of curvature;
- said downwardly projecting deformities having bottoms and sides having intersections therebetween which form radii of curvature;
- and
- a polycrystalline material layer having a cutting surface and an opposed mounting surface, the mounting surface having deformities complementary to and in contact with the deformities of the support surface of the substrate, said mounting surface being joined to the said support surface.
2 more elements
Dependencies are inferred from the claim text.