Tungsten And Tungsten Carbide Patents (Class 76/DIG11)
  • Patent number: 6055886
    Abstract: A drill blank, particularly a blank for a micro-drill, comprises an elongate cylindrical cemented carbide body, having flat end surfaces, a recess formed in one end surface and taking the form of an island in that surface wholly surrounded by cemented carbide, and an abrasive compact located in the recess, bonded to a cemented carbide, and presenting a surface coincident with the carbide end surface in which the recess is located. A drill may be formed from the drill blank by suitably shaping the cemented carbide body, for example, by fluting, in the region of the abrasive compact to expose the abrasive compact.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: May 2, 2000
    Inventors: Klaus Tank, Iakovos Sigalas
  • Patent number: 5868885
    Abstract: A method for manufacturing cutting tools having diamond-like cutting edges or surfaces which are formed by bonding high shear compaction diamond or cubic boron nitride (CBN) ropes or strips in helical grooves formed on the cutting tool outer surface. The strips are formed by slitting a sheet of high shear compaction diamond or CBN material. The ropes are formed by rolling the strips between grooved rollers.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: February 9, 1999
    Assignee: Smith International, Inc.
    Inventors: Ronald B. Crockett, Scott M. Packer, Richard L. Dixon, Nathan R. Anderson, Ronald K. Eyre, Madapusi K. Keshavan, Ghanshyan Rai
  • Patent number: 5845547
    Abstract: An excavating tool has a tungsten carbide insert which is more wear resistant and not subject to breakage because of being too brittle. The insert has a semispherical tip, a divergent midsection and a base with a conical rear surface. The insert is made with tungsten carbide particles sized between 1 and 8 microns and averaging between 2 and 5 microns, blended with particles of a binder of which the binder comprises 5.5 to 6.5 percent of the blend by weight, and the insert is sintered to a hardness of 89.5 R.sub.a or more.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: December 8, 1998
    Assignee: The Sollami Company
    Inventor: Phillip A. Sollami
  • Patent number: 5588319
    Abstract: A method and apparatus for forming a strip of fins with louvers comprising providing fin forming rolls comprising stacked carbide plates having rolling and cutting edges forming fins with louvers, and directing a strip of clad aluminum between an opposed pair of fin forming rolls. The carbide plates are preferably made of carbide containing tungsten, cobalt and carbon, wherein the major constituent is tungsten.
    Type: Grant
    Filed: November 7, 1995
    Date of Patent: December 31, 1996
    Assignee: Livernois Research & Development Company
    Inventors: Sabatino A. Bianchi, Richard P. Stoynoff
  • Patent number: 5579856
    Abstract: A milled tooth (22) is provided having a back face (38), including an upper back face surface (58) and a lower back face surface (60). A tip or top surface (36) is provided below the upper back face surface (58). The upper back face surface (58) is in a recessed position relative to the lower back face surface (60). A gage rib guide (64) runs along one side of the lower back face surface (60). A layer of hardfacing material (33) is applied to the milled tooth (22) so that the layer (72) applied to the lower back face (60) surface is flush with the gage rib guide (64) and the layer (74) of hardfacing material (33) is thickest in the region of the upper back face surface (58).
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: December 3, 1996
    Assignee: Dresser Industries, Inc.
    Inventor: Jay S. Bird
  • Patent number: 5365805
    Abstract: A cutting insert is produced by form-pressing and sintering of powder. The insert comprises a top chip surface, a bottom surface, and at least one edge surface extending between the top and bottom surfaces. The edge surface includes at least one relief surface portion which intersects the top surface at an acute angle to form therewith a cutting edge. A grinding operation is performed on the edge surface, but only along a lower portion thereof disposed below the relief surface portion, i.e., only along an area which is to be placed against a locating surface of a machine tool during a cutting operation.
    Type: Grant
    Filed: January 14, 1993
    Date of Patent: November 22, 1994
    Assignee: Sandvik AB
    Inventors: Goran Pantzar, Sven-Erik Carlsson
  • Patent number: 5355750
    Abstract: An improved earth-boring bit the rolling cone variety and an insert for use therein is provided. A superabrasive element is coated with at least one layer of metallic material. The superabrasive element then is placed in a receptacle cavity in a pre-formed hard metal jacket. The superabrasive element then is brazed or infiltrated to the hard metal jacket. Metallurgical and mechanical bonds between the superabrasive element, the at least one layer of metallic material on superabrasive element, the braze or infiltrant binder material, and the fracture-tough material of the hard metal jacket retain the superabrasive element in the cavity of the hard metal jacket. Improved earth-boring bits according to this embodiment of the present invention provide abrasion-resistant earth-boring bits of the rolling cutter variety. Such improved bits, and the inserts therefore, are formed without resort to high-temperature, high-pressure processes.
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: October 18, 1994
    Assignee: Baker Hughes Incorporated
    Inventors: Danny E. Scott, Redd H. Smith, Gordon A. Tibbitts
  • Patent number: 5333520
    Abstract: A method for manufacturing of a cemented carbide body for cutting tools, rock drilling tools or wear parts with complicated geometry characterized in that the body is sintered together from simpler pressed but unsintered parts to form a body with desired complex geometry.
    Type: Grant
    Filed: May 18, 1993
    Date of Patent: August 2, 1994
    Assignee: Sandvik AB
    Inventors: Udo K. Fischer, Jan Akerman, Bengt A. Asberg, Stig E. Lagerberg
  • Patent number: 5327806
    Abstract: For shear-cutting a stack of thin strips of amorphous steel along a cutting plane that extends transversely of the stack, an apparatus that comprises two blades that are positioned at the start of a cutting operation on opposite sides of the stack is utilized. Each of the blades has a first surface for engaging one side of the stack and a second surface extending transversely of the first surface and generally parallel to said cutting plane and intersecting the first surface at a corner. The first surface of each blade is disposed at a predetermined rake angle with respect to a reference plane extending through a point on the corner of the blade and normal to said cutting plane.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: July 12, 1994
    Assignee: General Electric Company
    Inventor: William K. Houser
  • Patent number: 5299472
    Abstract: A method of and apparatus for mounting hard material tips to a cutter tool such as a saw blade body (6), wherein a gripper/pick-up member/element (4) for handling the tips (8) to be mounted or other material required in the tip mounting operation is moveable about an axis (1) in order to transfer the tips or other material from a supply(ies) thereof to a location (9) at which the tips can be mounted or said other material can be utilized in the mounting of the tips.
    Type: Grant
    Filed: September 25, 1991
    Date of Patent: April 5, 1994
    Assignee: Razedge Limited
    Inventor: Glynn A. Ellis
  • Patent number: 5297456
    Abstract: The invention relates to a cutting tool having twisted edge in a blade part, having a sintered compact with higher hardness and higher wear resistance than a base sintered body buried and affixed along the twisted edge, and its manufacturing method. The blade part of the cutting tool comprises the base sintered body having a twisted groove in the position of forming the twisted edge on the outer circumference, and the sintered compact of high hardness and high wear resistance applied and buried in the twisted groove and affixed to the base sintered body by sintering, and the twisted edge is formed on the sintered compact of high hardness and high wear resistance.
    Type: Grant
    Filed: May 11, 1993
    Date of Patent: March 29, 1994
    Assignee: GN Tool Co., Ltd.
    Inventor: Takayuki Nishimura
  • Patent number: 5291807
    Abstract: A drill bit including at least one rolling cutter body with rows of relatively hard substantially outwardly projecting and circumferentially spaced cutting inserts projecting from the cutter body and having effective erosion reducing features by application of hardfacing materials placed in oriented regular patterns and shapes on designated critical and vulnerable cutter body areas. The cutter body is produced by a method wherein the body is marked in specific locations of desired patterns, shapes, or boundaries, and, then, hardfacing is applied in these specific boundaries to avoid the insert hole locations. After the hardfacing is permanently bonded to the specified areas, the holes are drilled and the hard cutting inserts are pressed into the holes.
    Type: Grant
    Filed: August 10, 1992
    Date of Patent: March 8, 1994
    Assignee: Dresser Industries, Inc.
    Inventors: William D. Vanderford, Alan D. Huffstutler
  • Patent number: 5291805
    Abstract: A hand held sharpening and deburring tool is disclosed which is capable of sharpening a variety of bladed implements such as knives, hatchets, scissors, cleavers, garden trowels and etc. The tool comprises a body having a handle grip section, a sharpening/deburring section and a transition section that melds the grip and sharpening/deburring sections together and also mounts a guard for protecting the operator's hand from injury. The sharpening/deburring section including a first transversely mounted sharpening/deburring insert extending to one side of the body for sharpening or deburring a scissors blade or like device, said sharpening/deburring section also including second and third sharpening/deburring inserts defining a V-shaped notch which extends toward the tip of the body for sharpening or deburring the cutting edge of a knife or like device.
    Type: Grant
    Filed: July 6, 1992
    Date of Patent: March 8, 1994
    Inventors: Gary L. Byers, Timothy W. Byers
  • Patent number: 5272940
    Abstract: A rotary cutting tool has a plurality of helical channels located in the body of the rotary cutting tool. Individual cutter segments are bonded within each helical channel to form a continuous helical cutting edge that is machined to a finished state. An area of the tool body adjacent to the helical channel is removed to create helical flutes. Preferably, the segments are cut from disks of polycrystalline diamond (PCD) or polycrystalline cubic boron nitride (PCBN).
    Type: Grant
    Filed: June 9, 1992
    Date of Patent: December 28, 1993
    Assignee: DiCO Corporation
    Inventor: Phillip A. Diskin
  • Patent number: 5195403
    Abstract: A method of producing a composite cutting insert for a twist drill includes the steps of cutting an intermediate blank from a composite diamond compact. The intermediate blank comprises a relatively broad tungsten carbide strip with a relatively narrow polycrystalline diamond strip at one edge. First and second cutting insert halves are cut from the intermediate blank, each cutting insert half defining a cutting edge of the diamond material. The cutting insert halves are arranged back-to-back to form a composite cutting insert, with the cutting edges on opposite sides of a central plane. The cutting edges are arranged to define a chevron shaped composite cutting edge. The cutting insert halves are preferably brazed together to form a unitary cutting insert. The invention extends to a method of producing a twist drill including the steps of forming a slot-shaped seat diametrally in the end of a twist drill body, and brazing the composite cutting insert into the seat.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: March 23, 1993
    Assignee: De Beers Industrial Diamon Division Limited
    Inventors: Mohammad N. Sani, Graeme D. Dufferwiel
  • Patent number: 5186739
    Abstract: A cermet alloy and a drill formed of the cermet alloy include hard dispersed phases and binder metal phases. The hard dispersed phases include a metal atom group containing titanium and a nonmetal atom group containing nitrogen. The amount of titanium contained in the metal atom group is at least 0.5 and not more than 0.95 as an atomic ratio. The amount of nitrogen contained in the nonmetal atom group is at least 0.1 and not more than 0.7 as an atomic ratio. The hard dispersed phases further include a fine grained portion having a mean grain size of at least 0.2 .mu.m and not more than 0.6 .mu.m and a coarse grained portion having a mean grain size of at least 1 .mu.m and not more than 3 .mu.m. The volume ratio of the fine grained portion to the course grained portion is at least 0.3 and not more than 3. The proportion of the binder metal phases contained in the cermet is at least 5 percent by weight and not more than 30 percent by weight.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: February 16, 1993
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kazutaka Isobe, Toshio Nomura
  • Patent number: 5159857
    Abstract: In an improved single piece earth boring bit of the type having a body including a solid bit face on one end and a shank on the opposite end for connection in a drill string, an improved cutting structure having diamond filled compacts used as a wear resistant inserts. The improved compacts have hard metal jackets and integrally formed diamond cores. The improved compacts are advantageously used as wear resistant inserts in the gage and heel rows of the bit.
    Type: Grant
    Filed: March 1, 1991
    Date of Patent: November 3, 1992
    Assignee: Hughes Tool Company
    Inventor: Stephen R. Jurewicz
  • Patent number: 5120327
    Abstract: A composite for cutting in subterranean formations comprises a cemented carbide substrate and a diamond layer adhered to a surface of the substrate. That surface includes a plurality of spaced apart ridges forming grooves therebetween. The diamond layer has a thickness greater than a depth of the grooves and occupies the grooves to interlock with the substrate. The diamond is comprised of a substantially uniform distribution of diamond particles having a grain size in a range of about 25-75 microns. The ridges are spaced radially inwardly from an outer periphery of the substrate, whereby the diamond layer includes an annular ring portion completely surrounding the plurality of ridges to provide radial reinforcement against the formation and propagation of cracks tending to occur in the vicinity of the ridges.
    Type: Grant
    Filed: March 5, 1991
    Date of Patent: June 9, 1992
    Assignee: Diamant-Boart Stratabit (USA) Inc.
    Inventor: Mahlon D. Dennis
  • Patent number: 5119714
    Abstract: In an improved earth boring bit of the type having one or more rotable cones secured to bearing shafts, an improved cutting structure having diamond filled compacts used as a wear resistant inserts. The improved compacts have hard metal jackets and integrally formed diamond cores. The improved compacts are advantageously used as gage and heel row compacts when inserted in mating recesses provided on the exteriors of the rotatable cones.
    Type: Grant
    Filed: March 1, 1991
    Date of Patent: June 9, 1992
    Assignee: Hughes Tool Company
    Inventors: Danny E. Scott, Stephen R. Jurewicz
  • Patent number: 5115697
    Abstract: A diamond cutting tool is disclosed that forms at least a pair of grooves in the shank of the tool. The grooves contain sintered diamond prior to formation of concave flutes next to the grooves. The grooves are angled to form positive or negative cutter rake angles, whichever is desired. The adjacent concave flutes subsequently formed in the shank of the tool begin parallel with the cutting face of the sintered diamond and curve away from the base of the diamond back towards the surface of the shank. Sharpening of the diamond then results in very little removal of the diamond material thus assuring the integrity of the tool.
    Type: Grant
    Filed: August 16, 1991
    Date of Patent: May 26, 1992
    Assignee: Smith International, Inc.
    Inventors: Arturo A. Rodriguez, Ronald B. Crockett
  • Patent number: 5111895
    Abstract: A cutting element for a rotary drill bit comprises a thin superhard table of polycrystalline diamond material, defining a front cutting face, bonded to a less hard substrate. The substrate is formed from a material containing at least a proportion of tungsten metal. The substrate may be formed of a metal matrix composite comprising tungsten metal particles in a metal binder phase comprising material selected from: Cu, Co, Ni+Cu, Ni+Fe, Ni+Fe+Mo, Co+Ni. The substrate may also include tungsten carbide in which case the tungsten metal may be replaced by another softer refractory material.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: May 12, 1992
    Inventor: Nigel D. Griffin
  • Patent number: 5106674
    Abstract: A blade member of tungsten carbide based cemented carbide for cutting tools has a tungsten carbide based cemented carbide substrate having a hard phase, a binder phase and unavoidable impurities. The hard phase has 5% to 60% by weight of one or more of carbide and carbo-nitride of titanium, tantalum and tungsten, and carbide and carbonitride of titanium, tantalum, niobium and tungsten. The binder phase has 3% to 10% by weight of cobalt and a balance tungsten carbide. The substrate has a surface softening layer having a cobalt-pool phase and an interior portion. The surface softening layer has an outermost region in which hardness is generally constant with respect to depth from the substrate surface and an inner region in which hardness rises inwardly of the substrate up to the hardness of the interior portion. There is also disclosed a process for producing the above-mentioned blade member.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: April 21, 1992
    Assignee: Mitsubishi Materials Corporation
    Inventors: Yoshikazu Okada, Jun Sugawara
  • Patent number: 5101691
    Abstract: A method of manufacturing a cutter assembly for a rotary drill bit includes the step of bonding to a carrier a cutting element which comprises a thin hard facing layer already bonded to a less hard backing layer, the backing layer having a greater coefficient of thermal expansion than the hard facing layer. In order to compensate for convex deformation of the rear surface of the backing layer, when the cutting element is heated during the bonding process, the rear surface is made initially concave at ambient temperature. Alternatively, or additionally, the co-operating surface of the carrier may be concave.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: April 7, 1992
    Assignee: Reed Tool Company Limited
    Inventor: John D. Barr
  • Patent number: 5101692
    Abstract: A two-part investment casting process is described which involves first casting a hard material shell (32) such as stellite, which is threaded or profiled internally to allow attachment to a pre-machined shank (44) such that the advantages of a fluid and wear resistant investment casting of complex shape may be combined with a tough and machinable shank to allow attachment to the drill string.
    Type: Grant
    Filed: September 14, 1990
    Date of Patent: April 7, 1992
    Assignee: Astec Developments Limited
    Inventor: Neil A. A. Simpson
  • Patent number: 5070748
    Abstract: An end mill forms at least a pair of spiral grooves or flutes in the mill side walls. Each groove includes polycrystalline diamond formed along a leading edge of each flute. A process for forming the diamond edged on the PCD material bonded within the flute.
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: December 10, 1991
    Assignee: Smith International, Inc.
    Inventor: Scott M. Packer
  • Patent number: 5068148
    Abstract: A tool member includes a tungsten carbide based cemented carbide substrate and a diamond coating deposited on the substrate. The substrate has two diffraction peaks K.alpha..sub.1 and K.alpha..sub.2 indexed by index of pane (211) for tungsten carbide in X-ray diffraction. The peaks satisfy the relationship of 1.sub.1 /1.sub.2 .ltoreq.35, where 1.sub.1 and 1.sub.2 are heights of the peaks K.alpha..sub.1 and K.alpha..sub.2 measured from a base of a trough between the two diffraction peaks. For manufacturing the tool member, a green compact is first sintered to provide a tungsten carbide based cemented carbide substrate. Subsequently the substrate is ground and subsequently heat-treated at a temperature between 1000.degree. C. and 1600.degree. C. in a vacuum or in a non-oxidizing atmosphere. Thereafter, a diamond coating is formed on the substrate by vapor-deposition method.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: November 26, 1991
    Assignee: Mitsubishi Metal Corporation
    Inventors: Kei Nakahara, Keiichi Sakurai, Toshihiko Okamura, Hironori Yoshimura, Hiroyuki Eto, Noribumi Kikuchi
  • Patent number: 5066553
    Abstract: There is disclosed a surface-coated tool member of tungsten carbide based cemented carbide which has a tungsten carbide based cemented carbide substrate and a hard coating formed on the substrate. The hard coating may have one or more layers each of which is made of one material selected from the group consisting of carbide, nitride and oxide of metals in groups IV.sub.A, V.sub.A and VI.sub.A of the Periodic Table; solid solution of said carbide, nitride and oxide; and aluminum oxide. The cobalt content of the substrate in a surface portion at a depth of about 2 .mu.m from a surface thereof is less than that in an interior portion at a depth of about 100 .mu.m from said surface by at least 10%.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: November 19, 1991
    Assignee: Mitsubishi Metal Corporation
    Inventors: Hironori Yoshimura, Yoshihiro Sawada, Kei Nakahara, Hitoshi Kunugi, Keiichi Sakurai
  • Patent number: 5038642
    Abstract: The brazing seams that attach cutting edge wear inserts on a drill are protected against wear and erosion. The inserts are deliberately differentially sized so that the points where the brazing seams that attach them intersect the cutting edges are differentially spaced from the drill center line. Then, a notch is cut into each cutting edge just wide and deep enough to prevent the brazing seam from contacting the cut. Cutting is still complete, despite the notches, since they do not overlap.
    Type: Grant
    Filed: February 25, 1991
    Date of Patent: August 13, 1991
    Assignee: General Motors Corporation
    Inventors: John Alverio, John S. Agapiou
  • Patent number: 5038641
    Abstract: The inserts and pockets in an inserted drill are provided with differing curvatures on their arcuate back edges. Consequently, when the insert is aligned in the pocket, a crescent shaped, instead of annular, gap is created, with minimal or no thickness at the outboard ends. Very little braze seam is thus exposed to erosion at the cutting edge, but the braze seam is as strong or stronger than conventionally. It is also easier to maintain the desired thickness of the braze seam during manufacture.
    Type: Grant
    Filed: February 21, 1991
    Date of Patent: August 13, 1991
    Assignee: General Motors Corporation
    Inventors: Chi-Hung Shen, John Alverio
  • Patent number: 5031484
    Abstract: An end mill forms at least a pair of spiral grooves or flutes in the mill side walls. Each groove includes polycrystalline diamond formed along a leading edge of each flute. A process for forming the diamond edged on the PCD material bonded within the flute.
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: July 16, 1991
    Assignee: Smith International, Inc.
    Inventor: Scott M. Packer
  • Patent number: 5020394
    Abstract: A polycrystal diamond fluted tool is provided which is capable of effecting working with much higher accuracy and longer life as compared with the sintered diamond straight fluted tool of the prior art, and is particularly suitable for finishing working with high accuracy. The tool is produced by forming, by a vapor phase synthesis method, a polycrystal diamond film on the surface of a substrate which has been subjected to helical grinding, then subjecting the product to a chemical treatment to dissolve and remove only the substrate, brazing the resulting polycrystal diamond film in a fluted form to at least a part of the rake face of a tool base metal which has been subjected to helical grinding in a similar manner to the substrate, and then subjecting the brazed tool base metal to working of a flank face to form a cutting edge.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: June 4, 1991
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tsutomu Nakamura, Tetsuo Nakai
  • Patent number: 4991467
    Abstract: A diamond tipped twist drill for drilling holes in a work piece consists of a body forming a pair of flutes, each flute forming a channel that essentially parallels the flutes. Each channel ends at an aperture formed in the body nearest a cutting end of the drill. Diamond material is pressed into the flutes and through the aperture. Subsequent machining at the cutting end of the drill bit body exposes the sintered diamond forming a finished diamond cutting tip for the twist drill.
    Type: Grant
    Filed: August 14, 1989
    Date of Patent: February 12, 1991
    Assignee: Smith International, Inc.
    Inventor: Scott M. Packer
  • Patent number: 4971485
    Abstract: A drill is formed by a hard dispersed phase of WC and a B-1 type solid solution, and a bond metal phase of an iron family metal. The composition of the hard dispersed phase is expressed as (W.sub.a M.sub.b) (C.sub.x N.sub.y), where M represents Ti, or two or more metals, including Ti but excluding W, selected from the group IVa, Va and VIa of the periodic table, and a, b, x and y represents molar fractions which are defined by relational expressions of a+b=1, x+y=1, x>0, y.gtoreq.0 and b.gtoreq.0.4. The bond metal phase occupies at least 13 volume percent and not more than 30 volume percent of the cemented carbide.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: November 20, 1990
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Toshio Nomura, Nobuyuki Kitagawa, Kazutaka Isobe
  • Patent number: 4949599
    Abstract: There is provided a length of material from which may be cut tips for use with tools involving tips of material that is harder than that of the remainder of a tool, wherein said length of material is so preformed as to present at least one axially extending planar surface (17-25) which when a tip forming length (9) is cut therefrom and the tip forming length is mounted to a tool (4), lies substantially at the required operational angle for one of the faces of the tip that is to be involved with the cutting action thereof.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: August 21, 1990
    Assignee: Iseli & Co. AG
    Inventor: Benno Iseli
  • Patent number: 4947945
    Abstract: A cutter assembly, for a rotary drill bit, comprises a preform cutting element mounted on a carrier in the form of a stud or post received in a socket in the bit body. The carrier is a metal matrix composite, formed by sintering, hot-pressing or by an infiltration process, and comprising tungsten metal particles in a metal binder phase, or a mixture of tungsten metal particles and tungsten carbide particles in a metal binder phase.
    Type: Grant
    Filed: March 10, 1989
    Date of Patent: August 14, 1990
    Assignee: Reed Tool Company Limited
    Inventor: Nigel D. Griffin
  • Patent number: 4887496
    Abstract: Disclosed is a method of making drills, endmills and other rotating-and-cutting tools comprising the steps of: extruding super-hard metal powder into a spiral rod; sintering the spiral rod; forming a-ferrous metal powder layer around the rear end of the spiral rod sinter; and heating and then cooling the ferrous metal powder layer in such a way that voids may be caused to appear in the ferrous metal powder layer, which is integrally connected to the spiral rod sinter to make up its shank. Thanks to the existence of the voids in the shank layer, any inner strain will be dissipated, assuring that crack-free products result.
    Type: Grant
    Filed: September 21, 1988
    Date of Patent: December 19, 1989
    Inventor: Yoshinobu Kobayashi
  • Patent number: 4884477
    Abstract: A rotary drill bit is provided for boring earth formations which includes a bit blank and a metal matrix secured to the blank. The metal matrix includes a filler material dispersed therein. Cutting elements are mounted on the exterior face of the bit, and substantially all of the exposed internal and external surfaces of the bit are coated with an erosion and abrasion resistant hardfacing material bonded to the metal matrix.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: December 5, 1989
    Assignee: Eastman Christensen Company
    Inventors: Redd H. Smith, Craig H. Cooley
  • Patent number: 4730765
    Abstract: A method of bonding a cemented carbide surface to a metal surface is provided. The method involves applying an alloy layer to one or both of the surfaces, the alloy comprising a major amount of nickel or copper and a minor amount of phosphorus, heat treating the alloy layer below its liquidus temperature to cause it to diffusion bond to the surface top to which it is applied and bonding the surfaces together by means of a solder or braze alloy which preferably has a liquidus of no more than 750.degree. C. The method has particular application to bonding cutting inserts to drill bits and cutting tools for mining machines.
    Type: Grant
    Filed: December 4, 1985
    Date of Patent: March 15, 1988
    Inventors: Peter N. Tomlinson, Klaus Tank, Karl Schrittwieser
  • Patent number: 4731296
    Abstract: A diamond-coated tungsten carbide-base sintered hard alloy material for inserts of cutting tools, which has greatly improved bond strength or degree of bonding of the diamond coating layer to the matrix and therefore is capable of exhibiting excellent cutting performance over a long period of time.The sintered hard alloy material comprises:(1) a matrix of a sintered hard alloy consisting essentially of 1-4 percent by weight cobalt, and the balance of tungsten carbide and inevitable impurities, the tungsten carbide having a coarse grain structure having an average grain size of 2-10 microns; and(2) a diamond coating layer formed over surfaces of the matrix by forming an etching layer over the matrix surfaces and then forming the diamond coating layer over the matrix surfaces via the etching layer by a low pressure vapor-phase synthesization method.If required, the matrix may further contain CO1-CO8 (ISO) free carbon.
    Type: Grant
    Filed: June 24, 1987
    Date of Patent: March 15, 1988
    Assignee: Mitsubishi Kinzoku Kabushiki Kaisha
    Inventors: Noribumi Kikuchi, Tetsuro Komatsu, Hiroaki Yamasita, Hironori Yoshimura
  • Patent number: 4722405
    Abstract: A composite sintered rock bit insert for use in a rolling cutter is fabricated from two tungsten carbide components. The first component is formed of a tungsten carbide composite that is less wear resistant, but tougher, than the second component. The two components are joined at a parting plane which extends to an earth-engaging surface of the insert. The insert is mounted on a rolling cutter such that the component having the lower wear resistant properties is on the leading face of the insert. With this combination, the wear pattern of the insert maintains a crest-like configuration at its rock engaging surface.
    Type: Grant
    Filed: October 1, 1986
    Date of Patent: February 2, 1988
    Assignee: Dresser Industries, Inc.
    Inventor: James W. Langford, Jr.
  • Patent number: 4722125
    Abstract: A method for producing a tungsten carbide tip punch includes:(1) preparing a punch rod including a top surface having a cylindrical protrusion;(2) placing on the top surface of the punch rod a tungsten carbide piece having a hardness greater than that of the punch rod and including a bottom surface having a crown-like indentation which opens at the bottom surface and which is capable of being well matched with said cylindrical protrusion at the lowermost portion of the crown-like indentation.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: February 2, 1988
    Inventor: Da H. Peng
  • Patent number: 4705124
    Abstract: A cutting element adapted to be used in a rotary drill bit is made by positioning in an appropriately shaped die cavity a quantity of a mixture of tungsten carbide and 4 to 11 percent cobalt in the shape of a crown for defining an outer surface for the tip portion of the cutting element using a pressure of less than about 600 pounds per square inch; positioning in the cavity a quantity of a mixture of tungsten carbide and 12 to 17 percent cobalt sufficient to form almost all of a base portion and at least an inner part of the tip portion for the cutting element; pressing the two quantities of the mixtures together and into the die at pressures in the range of about 10 to 15 tons per square inch; and sintering the pressed insert to form the cutting element.
    Type: Grant
    Filed: August 22, 1986
    Date of Patent: November 10, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Gerald R. Abrahamson, Ernest J. Duwell
  • Patent number: 4694919
    Abstract: A method of manufacturing by a power metallurgy process a rotary drill bit including a bit body having an external surface on which are mounted a plurality of preform cutting elements, and an inner passage for supplying drilling fluid to at least one nozzle located in a socket at the external surface of the bit. The method includes the steps of forming a hollow mould for moulding the bit body, packing the mould with powdered material, such as tungsten carbide powder, and infiltrating the material with a metal alloy in a furnace to form a matrix. Before packing the mould with the powdered material, there is positioned in the interior surface of the mould at least one former which projects into the interior of the mould space at the desired location for a nozzle socket, the former having an external screw thread whereby the matrix material packed around the former becomes shaped with a corresponding internal screw thread.
    Type: Grant
    Filed: January 22, 1986
    Date of Patent: September 22, 1987
    Assignee: NL Petroleum Products Limited
    Inventor: John D. Barr
  • Patent number: 4683781
    Abstract: Tools, and particularly rock bit cutter cones, having "hard" cermet cutter inserts enveloped in an intermediate layer or coating of a suitable high melting metal, and embedded in a cast steel matrix, are disclosed. The cermet inserts, which usually comprise tungsten carbide in a cobalt phase (WC-Co), are coated with a layer of a metal or metal alloy, preferably nickel, which does not substantially melt during the subsequent step of casting the steel matrix of the tool. An additional layer of copper is advantageously employed on the cermet insert beneath the layer of the high melting metal, such as nickel. The coated inserts are held in appropriate position in a suitable mold, and the steel matrix of the tool is poured from molten metal. The coatings on the cermet inserts prevent thermal shock to the inserts, prevent deterioration of the cermet due to diffusion of carbon into the adjacent steel, and metallurgically bond the inserts to the embedding steel matrix.
    Type: Grant
    Filed: August 15, 1986
    Date of Patent: August 4, 1987
    Assignee: Smith International, Inc.
    Inventors: Nareshchandra J. Kar, William J. Salesky, Steven J. Guzowski
  • Patent number: 4642003
    Abstract: A rotary cutting tool for processing a metal workpiece includes an elongated solid body composed of cemented carbide containing cobalt. The body has cutting edge means at its forward end and an axis of rotation therethrough. The body has a surface of which cobalt content is greater than that of the remainder of the body. Part of the surface of the body is ground to remove the cobalt-rich surface therefrom.
    Type: Grant
    Filed: August 22, 1984
    Date of Patent: February 10, 1987
    Assignee: Mitsubishi Kinzoku Kabushiki Kaisha
    Inventor: Hironori Yoshimura
  • Patent number: 4640169
    Abstract: Resharpenable cemented carbide cutting tools which have been treated by ion implantation, as well as a method of making and using these tools, are described. Applicants have found that the benefits of the initial ion implantation on cemented carbide tool life will remain after sharpening of the tool.
    Type: Grant
    Filed: March 28, 1985
    Date of Patent: February 3, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: Robert E. Fromson, Ram Kossowsky, Charles S. Nunamaker
  • Patent number: 4571983
    Abstract: Metal-working dies which are typically made of steel are provided with substantially enhanced life by receiving a plasma-sprayed refractory metal coating which is subsequently compacted under conditions of minimum shear stress. The number of working cycles which can be obtained from a die before it is necessary to rework the die can be improved by as much as 3500%.
    Type: Grant
    Filed: April 30, 1985
    Date of Patent: February 25, 1986
    Assignee: United Technologies Corporation
    Inventors: Harold C. Sanborn, Frank Carago, John R. Kreeger
  • Patent number: 4499795
    Abstract: A method is disclosed for the manufacture of a drill bit having a hollow tubular body, or drill bit components, with an exterior tungsten carbide coated surface, and with cutting elements positioned in the cutting surfaces thereof. The drill bit body, or a bit component, such as a cutting blade, is formed by casting in a mold providing the precise dimensions required in the finished bit. The mold is packed or coated over selected portions of the inner surface with particles of sintered tungsten carbide or similar sintered refractory hard metal. The mold has a plurality of soft iron or steel plugs extending from the walls thereof which are of the same diameter as the cutting inserts or passages into the bit body or bit component. A steel alloy, or cast iron, or nodular cast iron, is melted and poured into the mold. The temperature of the molten steel is sufficient to desinter the sintered tungsten carbide particles.
    Type: Grant
    Filed: September 23, 1983
    Date of Patent: February 19, 1985
    Assignee: Strata Bit Corporation
    Inventor: Robert P. Radtke
  • Patent number: 4463062
    Abstract: The bond between a hard wear resistant coating of Al.sub.2 O.sub.3 and a cemented carbide substrate is greatly improved by means of a more effective interlayer of TiO. The TiO layer is provided by means of a reduction process from other titanium oxides such as TiO.sub.2.
    Type: Grant
    Filed: March 25, 1983
    Date of Patent: July 31, 1984
    Assignee: General Electric Company
    Inventor: Thomas E. Hale
  • Patent number: 4453605
    Abstract: Disclosed is a method and apparatus for mechanically and metallurgically holding a cutter in a drill bit pocket. The method includes using powder metallurgy techniques in the formation of a drill bit member having a plurality of pockets configured to inhibit displacement of cutters out of the pockets in a direction transverse to the drill bit working surface. The method further includes the steps of metallurgically bonding and mechanically engaging the cutter with the cutter pocket. The drill bit manufactured in accordance with the methods of the present invention include a carbide menstrum drill bit head having a working surface with a plurality of fluid courses and nozzles thereon in adjacent relationship with a plurality of cutter blade bands comprising a series of cutter pockets having cutters disposed therein in a fashion parallel with the working surface.
    Type: Grant
    Filed: April 30, 1981
    Date of Patent: June 12, 1984
    Assignee: NL Industries, Inc.
    Inventor: Lot W. Short, Jr.