Cutting elements with geometries to better maintain aggressiveness and related earth-boring tools and methods
First Claim
1. A cutting element for an earth-boring tool, comprising:
- a substrate; and
a polycrystalline, superhard material secured to an end of the substrate;
wherein a first, greatest diameter of the polycrystalline, superhard material is greater than a second, greatest diameter of the substrate, as measured in a direction at least substantially parallel to a cutting face of the polycrystalline, superhard material;
wherein the polycrystalline, superhard material extends laterally beyond a side surface of the substrate around an entire circumference of the substrate;
wherein an obtuse angle is defined between the side surface of the substrate and a surface of the polycrystalline, superhard material extending from the first, greatest diameter of the polycrystalline, superhard material toward the substrate; and
wherein a lateral perimeter of a cutting face defined by the polycrystalline, superhard material is defined by four arcuate edges intersecting at four points, wherein a radius of curvature of at least one of the arcuate edges is different from another radius of curvature of at least another of the arcuate edges.
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Accused Products
Abstract
Cutting elements for earth-boring tools may include a substrate and a polycrystalline, superhard material secured to an end of the substrate. A first, greatest diameter of the polycrystalline, superhard material may be greater than a second, greatest diameter of the substrate, as measured in a direction at least substantially parallel to a cutting face of the polycrystalline, superhard material. Methods of making cutting elements for earth-boring tools may involve securing a polycrystalline, superhard material to an end of a substrate. A first, greatest diameter of the polycrystalline, superhard material may be rendered greater than a second, greatest diameter of the substrate, as measured in a direction at least substantially parallel to a cutting face of the polycrystalline, superhard material.
29 Citations
20 Claims
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1. A cutting element for an earth-boring tool, comprising:
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a substrate; and a polycrystalline, superhard material secured to an end of the substrate; wherein a first, greatest diameter of the polycrystalline, superhard material is greater than a second, greatest diameter of the substrate, as measured in a direction at least substantially parallel to a cutting face of the polycrystalline, superhard material; wherein the polycrystalline, superhard material extends laterally beyond a side surface of the substrate around an entire circumference of the substrate; wherein an obtuse angle is defined between the side surface of the substrate and a surface of the polycrystalline, superhard material extending from the first, greatest diameter of the polycrystalline, superhard material toward the substrate; and wherein a lateral perimeter of a cutting face defined by the polycrystalline, superhard material is defined by four arcuate edges intersecting at four points, wherein a radius of curvature of at least one of the arcuate edges is different from another radius of curvature of at least another of the arcuate edges. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An earth-boring tool, comprising:
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a body; and at least one cutting element located in a corresponding pocket extending into the body, the at least one cutting element comprising; a substrate; and a polycrystalline, superhard material secured to an end of the substrate; wherein a first, greatest diameter of the polycrystalline, superhard material is greater than a second, greatest diameter of the substrate, as measured in a direction at least substantially parallel to a cutting face of the polycrystalline, superhard material; wherein the first, greatest diameter of the polycrystalline, superhard material is greater than a third, greatest diameter of the pocket, as measured in the direction at least substantially parallel to the cutting face of the polycrystalline, superhard material; wherein the polycrystalline, superhard material extends laterally beyond a side surface of the substrate around an entire circumference of the substrate; wherein an angle is defined between the side surface of the substrate and a surface of the polycrystalline, superhard material extending from the first, greatest diameter of the polycrystalline, superhard material toward the substrate; and wherein a lateral perimeter of a cutting face defined by the polycrystalline, superhard material is defined by four arcuate edges intersecting at four points, wherein a radius of curvature of two of the arcuate edges is different from another radius of curvature of others of the arcuate edges.
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14. A method of making a cutting element for an earth-boring tool, comprising:
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securing a polycrystalline, superhard material to an end of a substrate; rendering a first, greatest diameter of the polycrystalline, superhard material greater than a second, greatest diameter of the substrate, as measured in a direction at least substantially parallel to a cutting face of the polycrystalline, superhard material; positioning the polycrystalline, superhard material to extend laterally beyond a side surface of the substrate around an entire circumference of the substrate; defining are angle between the side surface of the substrate and a surface of the polycrystalline, superhard material extending from the first, greatest diameter of the polycrystalline, superhard material toward the substrate; and defining a lateral perimeter of a cutting face defined by the polycrystalline, superhard material by forming four arcuate edges intersecting at four points, wherein a radius of curvature of at least one of the arcuate edges is different from another radius of curvature of at least another of the arcuate edges. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification