Class / Patent application number | Description | Number of patent applications / Date published |
175374000 | Specific or diverse material | 84 |
20080223619 | SYSTEM, METHOD, AND APPARATUS FOR PASSIVE AND ACTIVE UPDRILL FEATURES ON ROLLER CONE DRILL BITS - Strategically placed hardfacing material near the shank end of a drill bit above the transition edges provides additional protection for compensator areas and the upper leg surfaces of drill bits during updrilling and/or backreaming operations. The strategically located hardfacing is typically passive in the normal drill mode, but active in the updrill drilling mode and/or back reaming. Alternative designs including other strategic material placement, the formation of hardfacing materials in tooth/wear design shapes, bimetallic gage, graded composite hardfacing materials, recesses or cavities at edges of the outer diameter, and various methods of applying the material also may be employed. | 09-18-2008 |
20080245576 | CUTTING ELEMENTS WITH INCREASED TOUGHNESS AND THERMAL FATIGUE RESISTANCE FOR DRILLING APPLICATIONS - Cutting elements offering increased toughness and thermal fatigue resistance can be formed of a wear resistant material having coarse grains disposed in a binder matrix with a binder content of at least about 18% by weight. The coarse grains include grains of at least one selected from the group of a transition metal carbide, a transition metal boride, and transition metal nitride. The binder content and coarse grain size may be selected to provide a Rockwell A hardness of at least about 75 Ra or a wear number of at least about 1.5. | 10-09-2008 |
20080251297 | PASSIVE AND ACTIVE UP-DRILL FEATURES ON FIXED CUTTER EARTH-BORING TOOLS AND RELATED METHODS - Earth-boring tools include at least one up-drill feature disposed on a transition surface so as to be passive during down drilling and active during up drilling and/or back reaming operations. Systems for down drilling and up drilling with drill bits comprising one or more up-drill features are also disclosed. Furthermore, methods for forming a borehole with an earth-boring tool including such up-drill features and for forming an earth-boring tool comprising such up-drill features are also disclosed. | 10-16-2008 |
20080283304 | Steel tooth drill bit with improved tooth breakage resistance - A drill bit having steel teeth is provided with a combination of hardfacing materials on the teeth. The bases of the teeth are hardfaced with nickel-based materials to significantly reduce any potential cracking therein. Portions of the supporting cones adjacent the teeth also may be fabricated with the nickel-based hardfacing. All other portions of the teeth are hardfaced with iron-based materials. | 11-20-2008 |
20080314645 | Stiffened Blade for Shear-type Drill Bit - In one aspect of the invention, a drill bit comprises a steel body disposed intermediate a threaded end and a working face. The steel body comprises a plurality of steel blades disposed along an outer diameter of the body and extending radially away from an axis of rotation of the bit. A plurality of cutter elements is disposed on the plurality of steel blades and the blades each comprise a steel stiffness and a steel elastic modulus. At least one of the plurality of steel blades comprises a stiffening element and an overall stiffness at least 3.5 times greater than the steel stiffness. | 12-25-2008 |
20080314646 | BARRIER COATED GRANULES FOR IMPROVED HARDFACING MATERIAL USING ATOMIC LAYER DEPOSITION - A hardfacing composition for a drill bit that includes an abrasive phase comprising a plurality of abrasive particles having a barrier coating deposited by atomic layer deposition disposed thereon; and a binder alloy is disclosed. Drill bits having hardfacing compositions that include an abrasive phase comprising a plurality of abrasive particles having a barrier coating deposited by atomic layer deposition disposed thereon; and a binder alloy are also disclosed. | 12-25-2008 |
20090044984 | Corrosion Protection for Head Section of Earth Boring Bit - An earth boring bit has a steel body having at least one leg with a depending bearing pin. A cone having cutting elements is rotatably mounted to the bearing pin. A ball plug weld is on the outer surface of the leg. A layer of hardfacing applied to part of the outer surface of the leg, the hardfacing having carbide particles in a matrix. A corrosion resistant coating containing at least 50% nickel is formed on parts of the outer surface of the leg that are free of the layer of hardfacing both above and below the ball plug weld. | 02-19-2009 |
20090078469 | METHODS OF FORMING AND USING FIBER-CONTAINING DIAMOND-IMPREGNATED CUTTING TOOLS - Fibers for diamond-impregnated cutting tools and their associated methods for manufacture and use are described. A matrix is formed that contains fibers made from carbon, glass, ceramic, polymer, and the like. The matrix is then sintered to form a cutting portion of a drill bit. The type and concentration of the fibers can be modified to control the tensile strength and the erosion rate of the matrix to optimize the cutting performance of the tools. Additionally, the fibers may be added to the cutting section to weaken the structure and allow higher modulus binders to be used for the cutting tools at a lower cost, allowing the amount of fibers to be tailored to retain the diamonds in the cutting portion for the desired amount. As the cutting portion erodes, the fibers may also increase the lubricity at the face of the cutting portion. | 03-26-2009 |
20090166094 | Polycrystalline Diamond Materials Having Improved Abrasion Resistance, Thermal Stability and Impact Resistance - PCD materials comprise a diamond body having bonded diamond crystals and interstitial regions disposed among the crystals. The diamond body is formed from diamond grains and a catalyst material at high pressure/high temperature conditions. The diamond grains have an average particle size of about 0.03 mm or greater. At least a portion of the diamond body has a high diamond volume content of greater than about 93 percent by volume. The entire diamond body can comprise high volume content diamond or a region of the diamond body can comprise the high volume content diamond. The diamond body includes a working surface, a first region substantially free of the catalyst material, and a second region that includes the catalyst material. At least a portion of the first region extends from the working surface to depth of from about 0.01 to about 0.1 mm. | 07-02-2009 |
20090229887 | Rolling Cone Drill Bit Having Cutting Elements With Improved Orientations - A rolling cone drill bit for drilling a borehole in earthen formations. In an embodiment, the bit comprises a bit body. In addition, the bit comprises a cone cutter mounted on the bit body and adapted for rotation about a cone axis in a cutting direction. Further, the bit comprises at least one transition insert mounted to the cone cutter. Still further, the bit comprises a first asymmetric insert mounted to the cone cutter. Moreover, the bit comprises a second asymmetric insert mounted to the cone cutter. Each insert includes a cutting surface with a leading side relative to the cutting direction. The leading side of the first asymmetric insert has a leading geometry and the leading side of the second asymmetric insert has a leading geometry that is different than the leading geometry of the first asymmetric insert. | 09-17-2009 |
20090260890 | ANTI-TRACKING FEATURE FOR ROCK BITS - The harmful effects of tracking are reduced for a drill bit having roller cones with at least one of the outermost rows of active teeth containing one or more teeth having a height that does not extend to the height of at least one of the outermost rows on another roller cone on the bit. The crest on this tooth may have a length in a circumferential direction that is wider than an overall width of the tooth in the outer to inner direction. The invention may be used on any cutter row, not just the outermost row. The design may be used on a different roller cone or row, or more than one cutter row. The anti-tracking feature may be located between the leading and trailing edges of the tooth on one or more roller cones. | 10-22-2009 |
20090283332 | CONFORMAL BEARING FOR ROCK DRILL BIT - A rock drilling bit having PDC radial bearings has journal and cone bearing surfaces with increased contact area to increase load support. The radius of curvature of the bearing pin journal and cone bearing surfaces are matched or conformed on the bearing pressure side. The conformal journal surfaces may be formed on the main journal bearing, the pilot pin radial bearing, or both surfaces. In addition, diamond inlays may be located on the bearing surfaces of the cone, the bearing pin, or both components. | 11-19-2009 |
20090301788 | COMPOSITE METAL, CEMENTED CARBIDE BIT CONSTRUCTION - A manufacturing method and drill bit having either a preformed steel powder blank or machined steel core and abrasion and erosion resistant material components attached thereon. | 12-10-2009 |
20090301789 | METHODS OF FORMING EARTH-BORING TOOLS INCLUDING SINTERBONDED COMPONENTS AND TOOLS FORMED BY SUCH METHODS - Methods of forming earth-boring rotary drill bits by forming and joining two less than fully sintered components, by forming and joining a first fully sintered component with a first shrink rate and forming a second less than fully sintered component with a second sinter-shrink rate greater that that of the first shrink rate of the first fully sintered component, by forming and joining a first less than fully sintered component with a first sinter-shrink rate and by forming and joining at least a second less than fully sintered component with a second sinter-shrink rate less than the first sinter-shrink rate. The methods include co-sintering a first less than fully sintered component and a second less than fully sintered component to a desired final density to form at least a portion of an earth-boring rotary drill bit which may either cause the first less than fully sintered component and the second less than fully sintered component to join or may cause one of the first less than fully sintered component and the second less than fully sintered component to shrink around and at least partially capture the other less than fully sintered component. Earth-boring rotary drill bits are formed using such methods. | 12-10-2009 |
20090308662 | METHOD OF SELECTIVELY ADAPTING MATERIAL PROPERTIES ACROSS A ROCK BIT CONE - Methods of forming cutter assemblies for use on earth-boring tools include sintering a cone structure to fuse one or more cutting elements thereto and having a hardened land area. In some embodiments, one or more green, brown, or fully sintered cutting elements may be positioned on a green or brown cone structure prior to sintering the cone structure to a final density. Cutter assemblies may be formed by such methods, and such cutter assemblies may be used in earth-boring tools such as, for example, earth-boring rotary drill bits and hole openers. | 12-17-2009 |
20090308663 | ROTARY DRILL BITS AND DRILLING TOOLS HAVING PROTECTIVE STRUCTURES ON LONGITUDINALLY TRAILING SURFACES - A rotary drill bit or other drilling tool for drilling or reaming through subterranean formation and comprising a body comprising a distal end and gage areas near a proximal end thereof and comprising longitudinally upward extensions of a plurality of blades or legs. A longitudinally trailing, radially inwardly extending surface is associated with at least some gage pads or legs at the longitudinally trailing ends thereof. Protective structures in the form of superabrasive elements comprising a plurality of thermally stable polycrystalline diamonds, or so-called “TSPs” (thermally stable products) are secured to a trailing surface of at least one gage pad. PDC elements may be employed in combination with the TSPs. Non-diamond structures may also be employed, in lieu of or in conjunction with diamond structures, particularly if drilling of ferrous metal casing components is contemplated. | 12-17-2009 |
20100012384 | Steel Tooth Bit With Scooped Teeth Profile - An earth-boring bit has at least one steel tooth with a scoop-shaped profile. The scoop-shaped profile is formed by milling and hardfacing a tooth to have at least one flank with a concave profile. Additionally, the tooth may contain one flank with a concave profile and another with a convex profile. The centerline axis of the tooth may be moved to alter the angle between the flanks and the centerline to vary the manner in which the tooth engages the formation. | 01-21-2010 |
20100038145 | HARDFACING COMPOSITIONS FOR EARTH BORING TOOLS - A hardfacing composition essentially consisting of from about 50 to 75 percent by weight of a carbide phase having a particle size distribution of ±20% or less of a median particle size; and from about 25 to 50 percent by weight of binder phase is disclosed. Drill bits having such hardfacing compositions disposed thereon are also disclosed. | 02-18-2010 |
20100038146 | Bit Cone With Hardfaced Nose - A drill bit for drilling a wellbore, the drill bit having a cutter which has tungsten carbide inserts and a spear point. The spear point has a neck that joins a smooth portion of the cutter and blades that extend from the neck and converge to an apex. The blades define valleys or spaces between them. A layer of hardfacing is applied to the entire spear point including the interim spaces and the neck. | 02-18-2010 |
20100044115 | EARTH-BORING BIT PARTS INCLUDING HYBRID CEMENTED CARBIDES AND METHODS OF MAKING THE SAME - An earth-boring bit part such as, for example, a bit body, roller cone, or mud nozzle includes a hybrid cemented carbide composite. The hybrid cemented carbide includes a cemented carbide dispersed phase, and a cemented carbide continuous phase. A method of manufacture also is disclosed. | 02-25-2010 |
20100059286 | Drill Bit and Cutter Element Having Chisel Crest With Protruding Pilot Portion - A rolling cone drill bit includes a cutter element having a cutting portion with a chisel crest and a pilot portion extending beyond the chisel crest. The pilot portion includes a cutting surface that may be generally conical, or form a second chisel crest. The cutting tip of the pilot portion is supported by buttress portions which emerge from and extend beyond the flanks of the chisel crest to provide additional strength and support for the material of the pilot portion that extends beyond the height of the chisel crest. | 03-11-2010 |
20100078225 | Steel Tooth Disk With Hardfacing - An earth boring drill bit comprising a milled cutter having rows of teeth hardfacing guides on the cutter. Hardfacing is applied between adjacent teeth hardfacing guides to form a cutting element. The hardfacing may extend past the crest of the teeth hardfacing guides or end along the teeth hardfacing guides flanks. | 04-01-2010 |
20100078226 | Self Sharpening Steel Tooth Cutting Structure - An earth boring drill bit comprising a milled cutter having rows of teeth hardfacing guides on the cutter. Hardfacing is applied between adjacent teeth hardfacing guides to form a cutting element. The hardfacing may include an annular body with ridges that outwardly project from the body. | 04-01-2010 |
20100078227 | Bar Trimmers On Disk Bit - An earth boring drill bit comprising a milled cutter having rows of hardfacing guides on the cutter. Hardfacing is applied between adjacent hardfacing guides to form a hardfacing web that serves as a cutting element. The hardfacing web defines an interface between the hardfacing web and the hardfacing guide. The hardfacing web may extend past the crest of the hardfacing guides or end along the hardfacing guides flanks. Projecting hardfacing is provided on the interface to form trimmers. | 04-01-2010 |
20100084194 | Thermally Stable Ultra-Hard Polycrystalline Materials and Compacts - Thermally stable ultra-hard polycrystalline materials and compacts comprise an ultra-hard polycrystalline body that wholly or partially comprises one or more thermally stable ultra-hard polycrystalline region. A substrate can be attached to the body. The thermally stable ultra-hard polycrystalline region can be positioned along all or a portion of an outside surface of the body, or can be positioned beneath a body surface. The thermally stable ultra-hard polycrystalline region can be provided in the form of a single element or in the form of a number of elements. The thermally stable ultra-hard polycrystalline region can be formed from precursor material, such as diamond and/or cubic boron nitride, with an alkali metal catalyst material. The mixture can be sintered by high pressure/high temperature process. | 04-08-2010 |
20100089658 | DRILL BIT WITH CONTINUOUSLY SHARP EDGE CUTTING ELEMENTS - A method of optimizing drill bit design and an optimized drill bit for drilling a well into an earth formation comprising a bit body; a number of blades spaced around the bit body, each blade having a curved outer edge and a forward face; a first row of cutter pockets recessed into the face along the outer edge of each blade; a second group of cutter pockets recessed into the face of each blade offset from the first row; and a plurality of cutting elements, each cutting element being brazed into a different one of the cutter pockets. | 04-15-2010 |
20100101866 | DRILL BITS AND OTHER DOWNHOLE TOOLS WITH HARDFACING HAVING TUNGSTEN CARBIDE PELLETS AND OTHER HARD MATERIALS - A hardfacing is provided to protect surfaces of drill bits and other downhole tools. The hardfacing may include tungsten carbide particles or pellets formed with an optimum weight percentage of binding material and dispersed within and bonded to a matrix deposit. The tungsten carbide particles may be formed by sintering or other appropriate techniques. The tungsten carbide particles may have generally spherical shapes, partially spherical shapes or non-spherical shapes. | 04-29-2010 |
20100175926 | ROLLER CONES HAVING NON-INTEGRAL CUTTING STRUCTURES, DRILL BITS INCLUDING SUCH CONES, AND METHODS OF FORMING SAME - Methods of manufacturing roller cones for drill bits include providing both integral teeth and non-integral teeth on the roller cones. A layer of hardfacing may be applied to the integral teeth. Non-integral teeth may be formed on a body of a cone, or they may be separately formed from the body and attached thereto. In some embodiments, the non-integral teeth are formed by building-up the non-integral teeth from hardfacing material. Roller cones and earth-boring tools are formed using such methods. | 07-15-2010 |
20100193252 | CAST CONES AND OTHER COMPONENTS FOR EARTH-BORING TOOLS AND RELATED METHODS - The present invention relates to compositions and methods for forming a bit body for an earth-boring bit. The bit body may comprise hard particles, wherein the hard particles comprise at least one of carbide, nitride, boride, and oxide and solid solutions thereof, and a binder binding together the hard particles. The binder may comprise at least one metal selected from cobalt, nickel, and iron, and, optionally, at least one melting point reducing constituent selected from a transition metal carbide in the range of 30 to 60 weight percent, boron up to 10 weight percent, silicon up to 20 weight percent, chromium up to 20 weight percent, and manganese up to 25 weight percent, wherein the weight percentages are based on the total weight of the binder. In addition, the hard particles may comprise at least one of (i) cast carbide (WC+W2C) particles, (ii) transition metal carbide particles selected from the carbides of titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten, and (iii) sintered cemented carbide particles. | 08-05-2010 |
20100206639 | Infiltrated Carbide Matrix Bodies Using Metallic Flakes - A matrix powder for forming a matrix bit body, wherein the matrix powder includes: a plurality of carbide particles; and a plurality of first metal binder particles having an aspect ratio of at least about 3. Drill bits formed from metal binder particles having an aspect ratio of at least about 3 and methods of forming such bits. | 08-19-2010 |
20100206640 | Matrix Body Fixed Cutter Bits - A drill bit that includes a bit body having a plurality of blades extending radially therefrom, at least a portion of the plurality of blades comprises a first matrix region comprising a plurality of first carbide particles separated by a first binder phase, each of the first carbide particles comprising a mixture of WC and W | 08-19-2010 |
20100230173 | Carbide Composites - A carbide composite material that includes a continuous ductile phase; and at least one discrete carbide region surrounded by the continuous ductile phase, each discrete carbide region may comprise an integrally bridged plurality of cast and/or sintered carbide particles, and each discrete region may have a nodular particle morphology. | 09-16-2010 |
20100236834 | HARDFACING COMPOSITIONS, METHODS OF APPLYING THE HARDFACING COMPOSITIONS, AND TOOLS USING SUCH HARDFACING COMPOSITIONS - A hardfacing composition comprising an iron-based binder alloy; and a carbide phase comprising a sintered carbide and a cast tungsten carbide, wherein the cast carbide is present in a quantity of at least 22% by weight, based on the total weight of the carbide phase, and the cast carbide comprises particles having sizes in the range of from 30 to 60 mesh. Also provided is a hardfacing composition comprising an iron-based binder alloy; and a carbide phase comprising a super dense sintered carbide and one or more additional carbide materials, wherein the super dense sintered carbide is present in a quantity of at least 10 percent by weight (% w), based on the total weight of the carbide phase, and comprises particles having sizes in the range of from 16 to 40 mesh. Included are methods of manufacturing such hardfacing compositions and downhole tools having such improved hardfacing compositions applied thereon. | 09-23-2010 |
20100263935 | EARTH BORING ROTARY DRILL BITS AND METHODS OF MANUFACTURING EARTH BORING ROTARY DRILL BITS HAVING PARTICLE MATRIX COMPOSITE BIT BODIES - Methods of forming bit bodies for earth-boring bits include assembling green components, brown components, or fully sintered components, and sintering the assembled components. Other methods include isostatically pressing a powder to form a green body substantially composed of a particle-matrix composite material, and sintering the green body to provide a bit body having a desired final density. Methods of forming earth-boring bits include providing a bit body substantially formed of a particle-matrix composite material and attaching a shank to the body. The body is provided by pressing a powder to form a green body and sintering the green body. Earth-boring bits include a unitary structure substantially formed of a particle-matrix composite material. The unitary structure includes a first region configured to carry cutters and a second region that includes a threaded pin. Earth-boring bits include a shank attached directly to a body substantially formed of a particle-matrix composite material. | 10-21-2010 |
20100276208 | HIGH THERMAL CONDUCTIVITY HARDFACING FOR DRILLING APPLICATIONS - A high thermal conductivity hardmetal composition comprising tungsten carbide in a nickel based matrix binder is disclosed. The hardmetal has at least 50 wt % tungsten carbide, the tungsten carbide being composed of at least 50 vol % of spherical particles. The binder material is composed of at least 98.5 wt % of components selected from the group consisting of nickel, boron, and silica, and the binder flux of boron plus silica content ranges from between 3.5 to 10.0 wt % of the binder material. | 11-04-2010 |
20100276209 | Roller Cones, Methods of Manufacturing Such Roller Cones, and Drill Bits Incorporating Such Roller Cones - A roller cone drill bit having a layer of wear resistant material applied thereon utilizing a thermal spray process and methods of manufacturing such drill bits. | 11-04-2010 |
20100307838 | METHODS SYSTEMS AND COMPOSITIONS FOR MANUFACTURING DOWNHOLE TOOLS AND DOWNHOLE TOOL PARTS - Methods, systems and compositions for manufacturing downhole tools and downhole tool parts for drilling subterranean material are disclosed. A model having an external peripheral shape of a downhole tool or tool part is fabricated. Mold material is applied to the external periphery of the model. The mold material is permitted to harden to form a mold about the model. The model is eliminated and a composite matrix material is cast within the mold to form a finished downhole tool or tool part. | 12-09-2010 |
20110000715 | HARDFACING MATERIALS INCLUDING PCD PARTICLES, WELDING RODS AND EARTH-BORING TOOLS INCLUDING SUCH MATERIALS, AND METHODS OF FORMING AND USING SAME - Hardfacing materials include particles of polycrystalline diamond (PCD) material embedded within a matrix material. The PCD particles comprise a plurality of inter-bonded diamond grains. Material compositions and structures used to apply a hardfacing material to an earth-boring tool (e.g., welding rods) include PCD particles. Earth-boring tools include a hardfacing material comprising PCD particles embedded within a matrix material on at least a portion of a surface of a body of the tools. Methods of forming a hardfacing material include subjecting diamond grains to elevated temperatures and pressures to form diamond-to-diamond bonds between the diamond grains and form a PCD material. The PCD material is broken down to form PCD particles that include a plurality of inter-bonded diamond grains. Methods of hardfacing tools include bonding PCD particles to surfaces of the tools using a metal matrix material. | 01-06-2011 |
20110017517 | DIAMOND-ENHANCED CUTTING ELEMENTS, EARTH-BORING TOOLS EMPLOYING DIAMOND-ENHANCED CUTTING ELEMENTS, AND METHODS OF MAKING DIAMOND-ENHANCED CUTTING ELEMENTS - Cutting elements for use in earth-boring applications include a substrate, a transition layer, and a working layer. The transition layer and the working layer comprise a continuous matrix phase and a discontinuous diamond phase dispersed throughout the matrix phase. The concentration of diamond in the working layer is higher than in the transition layer. Earth-boring tools include at least one such cutting element. Methods of making cutting elements and earth-boring tools include mixing diamond crystals with matrix particles to form a mixture. The mixture is formulated in such a manner as cause the diamond crystals to comprise about 50% or more by volume of the solid matter in the mixture. The mixture is sintered to form a working layer of a cutting element that is at least substantially free of polycrystalline diamond material and that includes the diamond crystals dispersed within a continuous matrix phase formed from the matrix particles. | 01-27-2011 |
20110036639 | ROLLER CONE DISK WITH SHAPED COMPACTS - An earth boring drill bit that includes a cutting cone with a cutting disk. Compacts are inserted within the disk having a chisel shaped end set flush with the cutting disk periphery. The compact crests and cutting disk periphery form a generally seamless cutting surface. The cutting cone can further include cutting teeth thereon also having flush mounted compacts. The compacts can be made from a material such as cemented carbide, hardfacing, tungsten, tungsten alloys, tungsten carbide and the cutter made from steel. | 02-17-2011 |
20110042145 | METHODS FOR ENHANCING A SURFACE OF A DOWNHOLE TOOL AND DOWNHOLE TOOLS HAVING AN ENHANCED SURFACE - A downhole tool having a layer of wear resistant material applied thereon utilizing a thermal spray process and methods of manufacturing such downhole tools. | 02-24-2011 |
20110168452 | Tungsten Carbide Bit with Hardfaced Nose Area - An earth-boring bit has rotatable cones with rows of carbide elements installed thereon. A nose is symmetrically arranged on a cone axis of one of the cones. The nose has a central core that protrudes outward. A base joins supporting metal of the cone. A free end is opposite the base. Teeth are formed on the cone between the base and the free end, the teeth extending radially outward. A hard facing layer is located on the teeth. Intermediate hardfacings extend outward from the core between each of the teeth. The intermediate hardfacings may be lugs and preferably extend the same distance from the core as the teeth. | 07-14-2011 |
20110259647 | SYSTEMS FOR MANUFACTURING DOWNHOLE TOOLS AND DOWNHOLE TOOL PARTS - Methods, systems and compositions for manufacturing downhole tools and downhole tool parts for drilling subterranean material are disclosed. A model having an external peripheral shape of a downhole tool or tool part is fabricated. Mold material is applied to the external periphery of the model. The mold material is permitted to harden to form a mold about the model. The model is eliminated and a composite matrix material is cast within the mold to form a finished downhole tool or tool part. | 10-27-2011 |
20110266068 | EARTH-BORING TOOLS AND METHODS OF FORMING EARTH-BORING TOOLS - Methods of fabricating earth-boring tools include forming an outer portion of an earth-boring tool from a powder mixture comprising hard particles and matrix particles comprising a metal matrix material, disposing a molten material at least partially within the outer portion of the earth-boring tool, and forming the molten material into another portion of the earth-boring tool. Methods of fabricating a bit body of an earth-boring rotary drill bit include forming an outer portion comprising a plurality of hard particles and a plurality of matrix particles comprising a metal matrix material and casting a molten material at least partially within the outer portion of the bit body to form another portion of the bit body. Earth-boring tools include a body for engaging a subterranean borehole having an outer portion and an inner portion comprising at least one material solidified within a cavity formed within the outer portion. | 11-03-2011 |
20120067651 | HARDFACING COMPOSITIONS, METHODS OF APPLYING THE HARDFACING COMPOSITIONS, AND TOOLS USING SUCH HARDFACING COMPOSITIONS - A hardfacing composition comprising a carbide phase and a matrix phase, The carbide phase comprises mono-tungsten carbide in a quantity of greater than 50 percent by weight, based on the total weight of the carbide phase. The matrix phase comprises iron and nickel. The nickel is present in a quantity in the range of from 0.5 to 20 percent by weight, based on the total weight of the matrix phase. Also included are methods of applying such hardfacing compositions to a downhole tool and downhole tools having such hardfacing compositions applied thereon. | 03-22-2012 |
20120080236 | WEAR RESISTANT MATERIAL AT THE SHIRTTAIL EDGE AND LEADING EDGE OF A ROTARY CONE DRILL BIT - A rotary cone drill bit includes: a body, a leg depending from the body, a bearing shaft extending from the leg and a cone mounted to the bearing shaft. The leg includes a surface edge that is subject to wear during operation of the bit. A bottom surface of a hard material plate having an edge is attached to a conforming surface of the leg in a position where the edge of the hard material plate defines at least a portion of the surface edge of the leg. The attachment of the surfaces is made using a flowable material such as a brazing material. | 04-05-2012 |
20120080237 | WEAR RESISTANT MATERIAL FOR THE SHIRTTAIL OUTER SURFACE OF A ROTARY CONE DRILL BIT - A rotary cone drill bit includes: a body, a leg depending from the body, a bearing shaft extending from the leg and a cone mounted to the bearing shaft. The leg includes a surface location that is subject to wear during operation of the bit. A bottom surface of a hard material plate is attached to a substantially conforming surface of the leg at the location subject to wear. The attachment of the conforming surfaces is made using a flowable material such as a brazing material. | 04-05-2012 |
20120080238 | WEAR RESISTANT MATERIAL AT THE LEADING EDGE OF THE LEG FOR A ROTARY CONE DRILL BIT - A rotary cone drill bit includes: a body, a leg depending from the body, a bearing shaft extending from the leg and a cone mounted to the bearing shaft. The leg includes a leading edge (at an outer surface or shoulder surface, for example) that is subject to wear during operation of the bit. A bottom surface of a hard material plate having an edge is attached to a conforming surface of the leg in a position where the edge of the hard material plate defines at least a portion of the leading edge of the leg. The attachment of the surfaces is made using a flowable material such as a brazing material. | 04-05-2012 |
20120097455 | EARTH-BORING TOOLS AND COMPONENTS THEREOF INCLUDING MATERIAL HAVING HARD PHASE IN A METALLIC BINDER, AND METALLIC BINDER COMPOSITIONS FOR USE IN FORMING SUCH TOOLS AND COMPONENTS - Binder compositions for use in forming a bit body of an earth-boring bit includes at least one of cobalt, nickel, and iron, and at least one melting point-reducing constituent selected from at least one of a transition metal carbide up to 60 weight percent, a transition metal boride up to 60 weight percent, and a transition metal silicide up to 60 weight percent, wherein the weight percentages are based on the total weight of the binder. Earth-boring bit bodies include a cemented tungsten carbide material comprising tungsten carbide and a metallic binder, wherein the tungsten carbide comprises greater than 75 volume percent of the cemented tungsten carbide material. | 04-26-2012 |
20120097456 | EARTH-BORING TOOLS AND COMPONENTS THEREOF INCLUDING MATERIAL HAVING PRECIPITATE PHASE - The present invention relates to compositions for forming at least a portion of an earth-boring rotary drill bit. The rotary drill bit may comprise a cemented transition metal carbide composition containing at least one precipitate transition metal carbide phase and at least one binder phase. The binder phase may comprise an alloy of at least one of cobalt, iron, and nickel having a melting point less than 1350° C. | 04-26-2012 |
20120211282 | ROCK BIT AND CUTTER TEETH GEOMETRIES - A rolling cone drill bit for cutting a borehole comprises a rolling cone cutter mounted on a bit body and adapted for rotation about a cone axis. Further, the bit comprises a tooth extending from the cone cutter. The tooth includes a base at the cone cutter and an elongate chisel crest distal the cone cutter. The crest extends along a crest median line between a first crest end and a second crest end and includes an elongate crest apex. The tooth also includes a first flanking surface extending from the base to the crest, and a second flanking surface extending from the base to the crest. The first flanking surface and the second flanking surface taper towards one another to form the chisel crest. Moreover, the tooth includes a first raised rib extending continuously along the first flanking surfaces and across the chisel crest to the second flanking surface. | 08-23-2012 |
20120241222 | EARTH-BORING BITS AND OTHER PARTS INCLUDING CEMENTED CARBIDE - An article of manufacture includes a cemented carbide piece, and a joining phase that binds the cemented carbide piece into the article. The joining phase comprises a eutectic alloy material. The article of manufacture further includes a non-cemented carbide piece bound into the article of manufacture by the joining phase. An article of manufacture includes a fixed-cutter earth-boring bit body, a roller cone, and a part for an earth-boring bit. | 09-27-2012 |
20120325562 | DIAMOND ENHANCED CUTTING ELEMENTS, EARTH-BORING TOOLS EMPLOYING DIAMOND-ENHANCED CUTTING ELEMENTS, AND METHODS OF MAKING DIAMOND-ENHANCED CUTTING ELEMENTS - Cutting elements for use in earth-boring applications include a substrate, a transition layer, and a working layer. The transition layer and the working layer comprise a continuous matrix phase and a discontinuous diamond phase dispersed throughout the matrix phase. The concentration of diamond in the working layer is higher than in the transition layer. Earth-boring tools include at least one such cutting element. Methods of making cutting elements and earth-boring tools include mixing diamond crystals with matrix particles to form a mixture. The mixture is formulated in such a manner as cause the diamond crystals to comprise about 50% or more by volume of the solid matter in the mixture. The mixture is sintered to form a working layer of a cutting element that is at least substantially free of polycrystalline diamond material and that includes the diamond crystals dispersed within a continuous matrix phase formed from the matrix particles. | 12-27-2012 |
20130075165 | CUTTING INSERTS FOR EARTH-BORING BITS - A cutting insert for an earth-boring bit comprises a cemented carbide material. The cemented carbide material comprises a plurality of tungsten carbide grains, and a plurality of cubic carbide grains comprising at least one of titanium carbide, vanadium carbide, zirconium carbide, hafnium carbide, niobium carbide, tantalum carbide, mixtures thereof, and solid solutions thereof. The cemented carbide material also comprises a binder including at least one of cobalt, a cobalt alloy, nickel, a nickel alloy, iron, and an iron alloy. Embodiments of the cutting inserts are suitable for use on, for example, rotary cone earth-boring bits and fixed cutter earth-boring bits. A hybrid cemented carbide material comprising first regions of cemented carbide based on tungsten carbide and cobalt, dispersed in a continuous region of cemented carbide material comprising cubic carbides also is disclosed and is useful in cutting inserts of earth-boring bits. | 03-28-2013 |
20130081881 | PROTECTIVE INSERTS FOR A ROLLER CONE BIT - A rolling cone cutter for a roller cone earth-boring bit has a generally conical body. The generally conical body defines a plurality of lands and grooves. Each land supports a circumferential row of primary cutter elements. At least one of the plurality of lands has a land sidewall. The land sidewall defines a boundary of an adjacent groove. A plurality of protective inserts are disposed within the land sidewall. The protective inserts may reduce erosion of the land sidewall. One or more protective inserts may be disposed between a pair of primary cutters. | 04-04-2013 |
20130092449 | LOW COEFFICIENT OF THERMAL EXPANSION CERMET COMPOSITIONS - Low coefficient of thermal expansion (CTE) cermet compositions of this invention generally comprise a hard phase material and a ductile phase formed from a binder alloy, wherein the binder alloy is specially designed having a CTE that is closely matched to the hard phase material. Hard phase materials used to form low CTE compositions of this invention are selected from the group of carbides consisting of W, Ti, Mo, Nb, V, Si, Hf, Ta, and Cr carbides. The binder alloy is formed from a mixture of metals selected from the group consisting of Co, Ni, Fe, W, Mo, Ti, Ta, V, Nb, C, B, Cr, and Mn. In a preferred embodiment, low CTE compositions comprises WC as the hard phase material, and a ductile phase binder alloy formed from a mixture of Fe, Co, and Ni. The so-formed low CTE composition has a coefficient of thermal expansion that is less than that of conventional WC—Co at the same temperature and having the same metal content, thereby providing improved resistance to thermal shock and thermal fatigue related failure. | 04-18-2013 |
20130126246 | SCRAPING-WHEEL DRILL BIT - A scraping-wheel drill bit with a bit body configured at its upper extend for connection into a drillstring, comprising: a bit body ( | 05-23-2013 |
20130126247 | COMPOSITE DRILL BIT - A composite drill bit with a bit body configured at its upper extend for connection into a drillstring, comprising: a bit body ( | 05-23-2013 |
20130140094 | ROLLING CUTTER USING PIN, BALL OR EXTRUSION ON THE BIT BODY AS ATTACHMENT METHODS - A drill bit has a bit body, a plurality of blades extending radially from the bit body, wherein each blade comprises a leading face and a trailing face, a plurality of cutter pockets disposed on the plurality of blades, at least one rolling cutter, wherein each rolling cutter is disposed in one of the cutter pockets, and wherein each rolling cutter comprises a cutting face, a cutting edge, an outer circumferential surface, and a back face. A back retainer is disposed adjacent to the back face, wherein the back retainer protrudes partially into the rolling cutter along a rotational axis of the rolling cutter, and a front retainer is disposed adjacent to the at least one rolling cutter on the leading face of the blade. Each front retainer has a retention end, wherein the retention end is positioned adjacent to a portion of the cutting face of each rolling cutter, and an attachment end, wherein the attachment end is attached to a portion of the blade. | 06-06-2013 |
20130146367 | ROLLING CUTTER WITH IMPROVED ROLLING EFFICIENCY - A cutting structure may include an outer support element; and an inner rotatable cutting element comprising a cutting surface at its upper end; wherein the inner rotatable cutting element comprises at least one line contact along a circumferential side surface thereof and/or at least one point contact at a bottom face thereof. | 06-13-2013 |
20130168155 | DIAMOND ENHANCED DRILLING INSERT WITH HIGH IMPACT RESISTANCE - An insert for a drill bit may include a substrate; a working layer of polycrystalline diamond material on the uppermost end of the insert, wherein the polycrystalline diamond material includes a plurality of interconnected diamond grains; and a binder material; and an inner transition layer between the working layer and the substrate, wherein the inner transition layer is adjacent to the substrate; wherein the inner transition layer has a hardness that is at least 500 HV greater than the hardness of the substrate. | 07-04-2013 |
20130186694 | SUPERABRASIVE-IMPREGNATED EARTH-BORING TOOLS WITH EXTENDED FEATURES AND AGGRESSIVE COMPOSITIONS, AND RELATED METHODS - A superabrasive-impregnated earth-boring rotary drill bit includes cutting features extending outwardly from a bit body in a nose region of the drill bit. The cutting features comprise a composite material including superabrasive particles embedded within a matrix material. The cutting features extend from the outer surface of the bit body by a relatively high average distance. Methods of forming a superabrasive-impregnated earth-boring rotary drill bit include the formation of cutting features that extend outwardly from a bit body of a drill bit in a nose region of the drill bit. The cutting features are formed to comprise a particle-matrix composite material that includes superabrasive particles embedded within a matrix material. The cutting features are further formed such that they extend from the outer surface of the bit body by a relatively high average distance. | 07-25-2013 |
20130199857 | CUTTING ELEMENT RETENTION FOR HIGH EXPOSURE CUTTING ELEMENTS ON EARTH-BORING TOOLS - Earth-boring tools include a cutting element mounted to a body that comprises a metal or metal alloy, such as steel. A cutting element support member is mounted to the body rotationally behind the cutting element. The cutting element support member has an at least substantially planar support surface at a first end thereof, and a lateral side surface extending from the support surface to an opposing second end of the cutting element support member. The cutting element has a volume of superabrasive material on a first end of a substrate, and a lateral side surface extending from the first end of the substrate to an at least substantially planar back surface. The at least substantially planar back surface of the cylindrical substrate abuts an at least substantially planar support surface of the cutting element support member. | 08-08-2013 |
20130292184 | Polycrystalline Diamond Element with Unleached Side Surface and System and Method of Controlling Leaching at the Side Surface of a Polycrystalline Diamond Element - The disclosure provides a PCD element containing a substrate and a PCD layer. The PCD has a top surface, a side surface, an intermediate surface, an unleached region containing a diamond body matrix and an interstitial matrix including a catalyst, and a leached region containing a diamond body matrix and empty space in the place of the interstitial matrix. The catalyst has been leached from the empty space in the place of the interstitial matrix. The unleached region is adjacent to a substantial portion of the side surface and the leached region is not adjacent to a substantial portion of the side surface, and the leached region is adjacent to the top surface or the intermediate surface. The disclosure also provides a system and method for leaching a PCD element including a liquid able to leach a catalyst and a protective member. | 11-07-2013 |
20130333951 | CUTTING INSERTS, CONES, EARTH BORING TOOLS HAVING GRADING FEATURES, AND RELATED METHODS - Earth-boring tools include one or more cutting elements having at least one grading feature positioned a known distance from an initial working surface of the cutting element. Methods of grading cutting element loss on earth-boring tools include comparing locations of wear surfaces on cutting elements to locations of one or more grading features in or on the cutting elements. In some embodiments, a cutting element may comprise an insert having a generally cylindrical body, a substantially planar cutting face surface, a substantially arcuate side surface, and at least one grading feature. In additional embodiments, a cutting element may comprise a tooth having one or more grading features. | 12-19-2013 |
20140110180 | ULTRA-HARD MATERIAL CUTTING ELEMENTS, METHODS OF FORMING THE SAME AND BITS INCORPORATING THE SAME - The present disclosure relates to cutting tools incorporating polycrystalline diamond bodies used for subterranean drilling applications, and more particularly, to a polycrystalline diamond body joined to a substrate by a fastening member to form a cutting element. The polycrystalline diamond body may be binderless polycrystalline diamond, non-metal catalyst polycrystalline diamond, leached polycrystalline diamond, carbonate polycrystalline diamond or polycrystalline cubic boron nitride. The polycrystalline diamond body includes an aperture and a fastening member extending through the aperture and metallurgically bonded to the substrate by a HPHT process. | 04-24-2014 |
20140262537 | CUTTING ELEMENT WITH IMPROVED SUBSTRATE MATERIAL - Cutting elements comprise a body and a polycrystalline diamond table disposed thereon, wherein the diamond table has a thickness of greater than about 2 mm. The body is specially formed from WC—Co and has a Co content of equal to or less than about 10 weight percent based on the total weight of the WC—Co, a coefficient of thermal expansion that is less than about 5×10 | 09-18-2014 |
20140284114 | EARTH-BORING TOOLS AND COMPONENTS THEREOF INCLUDING MATERIAL HAVING HARD PHASE IN A METALLIC BINDER, AND METALLIC BINDER COMPOSITIONS FOR USE IN FORMING SUCH TOOLS AND COMPONENTS - Binder compositions for use in forming a bit body of an earth-boring bit include at least one of cobalt, nickel, and iron, and at least one melting point-reducing constituent selected from at least one of a transition metal carbide up to 60 weight percent, a transition metal boride up to 60 weight percent, and a transition metal silicide up to 60 weight percent, wherein the weight percentages are based on the total weight of the binder. Earth-boring bit bodies include a cemented tungsten carbide material comprising tungsten carbide and a metallic binder, wherein the tungsten carbide comprises greater than 75 volume percent of the cemented tungsten carbide material. | 09-25-2014 |
20140299384 | WEAR RESISTANT PLATES ON A LEADING TRANSITIONAL SURFACE OF THE LEG FOR A ROTARY CONE DRILL BIT - In an embodiment, a rotary cone drill bit comprises: a body, a leg depending from the body, a bearing shaft extending from the leg and a cone mounted to the bearing shaft. The leg includes a leading transitional surface. A bottom surface of a hard material plate is attached to a substantially conforming surface of the leg in a position where the hard material plate is disposed on a floor surface formed in or by the leading transitional surface of the leg. | 10-09-2014 |
20140345951 | ROLLING CUTTER - A cutting element for a drill bit that includes an outer support element having at least a bottom portion and a side portion; and an inner rotatable cutting element, a portion of which is disposed in the outer support element, wherein the inner rotatable cutting element includes a substrate and a diamond cutting face having a thickness of at least 0.050 inches disposed on an upper surface of the substrate; and wherein a distance from an upper surface of the diamond cutting face to a bearing surface between the inner rotatable cutting element and the outer support element ranges from 0 to about 0.300 inches is disclosed. | 11-27-2014 |
20140367174 | CUTTING STRUCTURES AND STRUCTURES FOR RETAINING THE SAME - A downhole cutting tool may include a tool body having at least one cutting element support structure formed thereon, wherein the at least one cutting element support structure comprises at least one cutter pocket formed therein; at least one cutter having at least substantially unobstructed cutting face retained within the at least one cutter pocket, the cutter pocket preventing substantial lateral movement of the at least one cutter; and at least one retention element interfacing a portion of a circumferential surface of the at least one cutter. | 12-18-2014 |
20140374169 | RETENTION OF MULTIPLE ROLLING CUTTERS - A cutting tool may include a tool body; at least one blade extending radially from the tool body; a plurality of cutters disposed on the at least one blade; and at least one retention component, each retention component contributing the retention of at least two of the plurality of cutters at a side surface thereof. | 12-25-2014 |
20150041222 | EARTH-BORING TOOLS AND METHODS OF FORMING EARTH-BORING TOOLS - Methods of fabricating earth-boring tools include forming an outer portion of an earth-boring tool from a powder mixture comprising hard particles and matrix particles comprising a metal matrix material, disposing a molten material at least partially within the outer portion of the earth-boring tool, and forming the molten material into another portion of the earth-boring tool. Methods of fabricating a bit body of an earth-boring rotary drill bit include forming an outer portion comprising a plurality of hard particles and a plurality of matrix particles comprising a metal matrix material and casting a molten material at least partially within the outer portion of the bit body to form another portion of the bit body. Earth-boring tools include a body for engaging a subterranean borehole having an outer portion and an inner portion comprising at least one material solidified within a cavity formed within the outer portion. | 02-12-2015 |
20150060149 | DRILL BIT HAVING SHEAR AND PICK-TYPE CUTTERS - A drill bit includes a bit body defining a plurality of blades extending from a selected distance from an axis of rotation of the bit body to a gage face. A plurality of only gouging cutters is mounted on the bit body. At least one of the plurality of blades has a blade top surface longitudinally behind the tips of the gouging cutters at a selected distance from the tips of the gouging cutters. | 03-05-2015 |
20150368980 | FIBER-REINFORCED TOOLS FOR DOWNHOLE USE - A wellbore tool may be formed, at least in part, by a fiber-reinforced hard composite portion that comprises reinforcing particles and reinforcing fibers dispersed in a binder, wherein the reinforcing fibers have an aspect ratio ranging from 1 to 15 times a critical aspect ratio (A | 12-24-2015 |
20160016291 | SUPERHARD CONSTRUCTIONS AND METHODS OF MAKING SAME - A method of forming a super hard PCD construction comprises forming an aggregated mass comprising a catalyst/solvent material for diamond, and one or more of W, Mo, Cr, V, Ti, Zr, Nb, Hf, Ta, Sc, and/or Y, forming a pre-sinter assembly comprising the aggregated mass and a plurality of diamond grains and treating the pre-sinter assembly at UHPT to form a PCD construction. Residual catalyst/solvent and one or more of W, Mo, Cr, V, Ti, Zr, Nb, Hf, Ta, Sc, and/or Y, in non-carbide form at least partially fill a plurality of interstitial regions in the PCD. There is also disclosed a superhard PCD construction comprising a body of PCD material formed of a mass of diamond grains and a non-superhard phase at least partially filling a plurality of interstitial regions, wherein the non-superhard phase comprises one or more of W, Mo, Cr, V, Ti, Zr, Nb, Hf, Ta, Sc, and/or Y, in the non-carbide form. | 01-21-2016 |
20160076307 | COMPOSITE DIAPHRAGM FOR ROLLER CONE PRESSURE COMPENSATION SYSTEM - To address issues of durability of pressure compensation systems in roller cone rock bits, a composite diaphragm of a pressure compensation system for a roller cone drill bit includes an inner surface that defines an inner cavity and is formed of a first elastomeric material. The inner cavity is configured to serve as a lubricant reservoir. An external surface is disposed opposite the inner surface and is formed of a second elastomeric material that is different than the first elastomeric material. | 03-17-2016 |
20160186499 | DIAMOND ENHANCED DRILLING INSERT WITH HIGH IMPACT RESISTANCE - An insert for a drill bit may include a substrate; a working layer of polycrystalline diamond material on the uppermost end of the insert, wherein the polycrystalline diamond material includes a plurality of interconnected diamond grains; and a binder material; and an inner transition layer between the working layer and the substrate, wherein the inner transition layer is adjacent to the substrate; wherein the inner transition layer has a hardness that is at least 500 HV greater than the hardness of the substrate. | 06-30-2016 |
175375000 | Welded | 6 |
20090173547 | ULTRA-HARD AND METALLIC CONSTRUCTIONS COMPRISING IMPROVED BRAZE JOINT - An ultra-hard and metallic construction comprises an ultra-hard component that is attached to a metallic component via a braze joint. The braze joint is interposed between the ultra-hard component and the metallic component, and comprises a first braze material bonded to a surface of the ultra-hard component. The braze joint includes an intervening layer in direct contact with the first braze material, and that is formed from a rigid material. The braze joint further comprises a second braze material that is interposed between the intervening layer and the metallic component, and that is different from the first braze material. Configured in this manner, the use of the braze joint operates to provide an optimum level of bond strength within the construction to enable its use in certain demanding wear and/or cutting applications. | 07-09-2009 |
20100065337 | Method and Apparatus for the Automated Application of Hardfacing Material to Rolling Cutters of Earth-Boring Drill Bits - The present invention relates to a system and method for automated or “robotic” application of hardfacing to the surface of a steel-toothed cutter of a rock bit. In particular, the system incorporates a grounded adapter plate and chuck mounted to a robotic arm for grasping and manipulating a rock bit cutter beneath an electrical or photonic energy welding source, such as a plasma arc welding torch manipulated by a positioner. In this configuration, the torch is positioned substantially vertically and oscillated along a horizontal axis as the cutter is manipulated relative along a target path for the distribution of hardfacing. Moving the cutter beneath the torch allows more areas of more teeth to be overlayed, and allows superior placement for operational feedback, such as automatic positioning and parameter correction. In the preferred embodiment, sensors provide data to the control system for identification, positioning, welding program selection, and welding program correction. The control system, aided by data from the sensors, manipulates the robotically held cutter while controlling the operation and oscillation of the torch. | 03-18-2010 |
20100071961 | BIT LEG OUTER SURFACE PROCESSING USING FRICTION STIR WELDING (FSW) - A roller cone drill bit includes a bit body and at least one leg extending downward from the bit body. Each leg includes an outer surface, a ball hole plug located in the outer surface, a shoulder, a shirttail, and a roller cone rotatably mounted to the leg. The outer surface of each leg is surface processed by friction stirring. | 03-25-2010 |
20130341100 | Modular cutting-teeth drill bit with controllable drilling specific pressure - A modular cutting-teeth drill bit with controllable drilling specific pressure comprises a module ( | 12-26-2013 |
20140196957 | TOOTH FOR ROLLER CRUSHER - An improved tooth for a roller crusher is presented. The tooth can include a first tungsten carbide overlay layer plasma-transfer arc welded on a recessed hemispherical end of the tooth, which is covered by a wearable cap placed over the first overlay layer, the cap welded to the tooth. A second tungsten carbide overlay layer can then be plasma-transfer arc welded over the cap to, thereby, provide a tooth having two tungsten carbide overlay wear layers. | 07-17-2014 |
20160145945 | LOW COLLISION DAMAGE BIT - A low collision damage bit may include one or more roller cones including a first material and a second material. The bit may have a bit axis and a bit body, and the second material of the one or more roller cones may be positioned farther from the bit axis than the bit body. The second material may have a hardness or yield strength less than the first material. | 05-26-2016 |