EP1527251B1 - Outils de coupe a double profil d'inclinaison - Google Patents

Outils de coupe a double profil d'inclinaison Download PDF

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Publication number
EP1527251B1
EP1527251B1 EP03764305A EP03764305A EP1527251B1 EP 1527251 B1 EP1527251 B1 EP 1527251B1 EP 03764305 A EP03764305 A EP 03764305A EP 03764305 A EP03764305 A EP 03764305A EP 1527251 B1 EP1527251 B1 EP 1527251B1
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EP
European Patent Office
Prior art keywords
substrate
periphery
face
annular face
diamond
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EP03764305A
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German (de)
English (en)
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EP1527251A1 (fr
Inventor
Thomas Charles Easley
Shan Wan
Gary Martin Flood
Eoin M. O'tighearnaigh
Rosemarie Shelly Snyder
Therese Raftery
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Diamond Innovations Inc
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Diamond Innovations Inc
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts
    • E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
    • E21B10/573—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element
    • E21B10/5735—Interface between the substrate and the cutting element

Definitions

  • the present invention relates to the field of abrasive tool inserts.
  • An abrasive particle compact is a polycrystalline mass of abrasive particles, such as diamond and/or cubic boron nitride (CBN), bonded together to form an integral, tough, high-strength mass.
  • abrasive particles such as diamond and/or cubic boron nitride (CBN)
  • CBN cubic boron nitride
  • Such components can be bonded together in a particle-to-particle self-bonded relationship, by means of a bonding medium disposed between the particles, or by combinations thereof.
  • the abrasive particle content of the abrasive compact is high and there is an extensive amount of direct particle-to-particle bonding.
  • Abrasive compacts are made under elevated or high pressure and temperature (HP/HT) conditions at which the particles, diamond or CBN, are crystallographically stable.
  • HP/HT high pressure and temperature
  • a supported abrasive particle compact herein termed a composite compact, is an abrasive particle compact, which is bonded to a substrate material, such as cemented tungsten carbide.
  • Abrasive compacts tend to be brittle and, in use, they frequently are supported by being bonded to a cemented carbide substrate. Such supported abrasive compacts are known in the art as composite abrasive compacts. Compacts of this type are described, for example, in U.S. Pats. Nos. 3,743,489 , 3,745,623 , and 3, 767,371 . The bond to the support can be formed either during or subsequent to the formation of the abrasive particle compact. Composite abrasive compacts may be used as such in the working surface of an abrasive tool.
  • Drill bits for use in rock drilling, machining of wear resistant materials, and other operations which require high abrasion resistance or wear resistance generally consist of a plurality of polycrystalline abrasive cutting elements fixed in a holder.
  • U.S. Pat. No. 4,109,737 describes drill bits with a tungsten carbide stud (substrate) having a polycrystalline diamond compact on the outer surface of the cutting element. A plurality of these cutting elements then are mounted generally by interference fit into recesses into the crown of a drill bit, such as a rotary drill bit.
  • These drill bits generally have means for providing water-cooling or other cooling fluids to the interface between the drill crown and the substance being drilled during drilling operations.
  • the cutting element comprises an elongated pin of a metal carbide (stud) which may be either sintered or cemented carbide (such as tungsten carbide) with an abrasive particle compact (e.g ., polycrystalline diamond) at one end of the pin for form a composite compact.
  • a metal carbide stud
  • cemented carbide such as tungsten carbide
  • abrasive particle compact e.g ., polycrystalline diamond
  • Fabrication of the composite compact typically is achieved by placing a cemented carbide substrate into the container of a press. A mixture of diamond grains or diamond grains and catalyst binder is placed atop the substrate and compressed under HP/HT conditions.
  • a composite compact formed in the above-described manner may be subject to a number of shortcomings. For example, the coefficients of thermal expansion and elastic constants of cemented carbide and diamond are close, but not exactly the same. Thus, during heating or cooling of the polycrystalline diamond compact (PDC), thermally induced stresses occur at the interface between the diamond layer and the cemented carbide substrate, the magnitude of these stresses being dependent, for example, on the disparity in thermal expansion coefficients and elastic constants.
  • PDC polycrystalline diamond compact
  • Another potential shortcoming relates to the creation of internal stresses within the diamond layer, which can result in a fracturing of that layer. Such stresses also result from the presence of the cemented carbide substrate and are distributed according to the size, geometry, and physical properties of the cemented carbide substrate and the polycrystalline diamond layer.
  • the tools are subject to delamination failures caused by thermally induced axial residual stresses on the outer diameter of the superabrasive layer. The stresses reduce the effectiveness of the tools and limit the applications in which they can be used.
  • 4,972,637 proposes a PDC having an interface containing discrete, spaced-apart recesses extending into the cemented carbide layer, the recesses containing abrasive material (e.g., diamond) and being arranged in a series of rows, each recess being staggered relative to its nearest neighbor in an adjacent row.
  • U.S. Patent No. 5,007,207 proposes an alternative PDC structure having a number of recesses in the carbide layer, each filled with diamond, which recesses are formed into a spiral or concentric circular pattern.
  • U.S. Patent No. 5,605,199 proposes a profile comprising a peripheral region with inclined inner surface surrounding an inner region.
  • U.S. Patent No. 6,315,652 proposes an abrasive tool insert having an interface formed in a sawtooth pattern of concentric rings extending from said center to the periphery.
  • U.S. Patent No. 5,484,330 suggests a saw tooth shaped cross-sectional profile and
  • U.S. Patent No. 5,494,777 proposes an outward sloping profile in the interface design.
  • U.S. Patent No. 5,743,346 proposes an interface having an inner surface and an outer chamfer that forms a 5° to 85° angle to the vertical, wherein the inner surface is other than the chamfer.
  • U.S. Patent No. 5,494,477 proposes a tool insert having an outer downwardly sloping interface.
  • U.S. Patent No. 5,971,087 also proposes various dual and triple slope interface profiles.
  • U.S. 2001/0037901 discloses drilling and boring devices comprising polycrystalline diamond compact (PCD) cutters with a polycrystalline diamond layer which extends across the top and around a portion of the sides of the PCD.
  • PCD polycrystalline diamond compact
  • the preferred embodiment of the drilling and boring devices have a flat interface between the PCD and the polycrystalline diamond layer.
  • the present invention relates to an abrasive tool insert which comprises a substrate having a support face that includes: an inner support table; an outer shoulder having a width, S w ; a downwardly sloping interface from the support table to the shoulder which interface has a slope angle, S a ; and a continuous abrasive layer integrally formed on the substrate support face, which abrasive layer includes: (a) a center having a height, D c ; (b) a diameter, D d ; (c) a periphery having a height, D p , in contact with the shoulder and which periphery forms a cutting edge; wherein, (i) S w :D d ranges from between 0 and about 0.5; and (ii) for each S a and S w :D d , D c :D p is selected so as to diminish residual stress in the abrasive layer.
  • the invention relates to an abrasive tool insert formed from a substrate having an inner face that has a center, and annular face which annular face has a periphery.
  • the inner face slopes outwardly and downwardly from the center at an angle ranging from between about 5° and 30° from the horizontal.
  • the annular face surrounds by the inner face and terminates at the periphery.
  • the annular face slopes downwardly and outwardly from the inner face at an angle of between about 20° and 75° from the horizontal.
  • a continuous abrasive layer having a center and a periphery forming a cutting edge, is integrally formed on the substrate and defines an interface therebetween.
  • the present invention further relates to a method of manufacturing abrasive tool inserts that possess diminished residual stress.
  • the invention relates to a method for forming an abrasive tool insert, which commences with providing a substrate having an inner face that has a center, and annular face which annular face has a periphery.
  • the inner face slopes outwardly and downwardly from the center at an angle ranging from between about 5° and 30° from the horizontal.
  • the annular face surrounds by the inner face and terminates at the periphery.
  • the annular face slopes downwardly and outwardly from the inner face at an angle of between about 20° and 75° from the horizontal.
  • a continuous abrasive layer having a center and a periphery forming a cutting edge, is integrally formed on the substrate and defines an interface therebetween.
  • the present invention is based on several relationships regarding residual stresses in cutting tool inserts that have eluded the art.
  • Applicants have found a unique geometry for cutters, wherein a sloped profile is incorporated in the interior of the cutter.
  • the sloped profile is combined with a steeper slope on the outer edge of the cutter, further reduces the surface residual stresses.
  • the slope angle of the diamond / substrate interface which features not known in the prior art, is found to affect the overall residual stresses in the cutting tool insert.
  • the height ratio between the center diamond table thickness and the periphery thickness is found to change the overall stress as it interacts with the slope angle.
  • the diamond table thickness is found to have an effect the overall residual stresses.
  • the cutting tool insert, or cutter may be manufactured, in one embodiment by fabricating a cemented carbide substrate in a generally cylindrical shape.
  • the cemented metal carbide substrate is conventional in composition and, thus, may be include any of the Group IVB, VB, or VIB metals, which are pressed and sintered in the presence of a binder of cobalt, nickel or iron, or alloys thereof. Examples include carbides of tungsten (W), niobium (Nb), zirconium (Zr), vanadium (V), tantalum (Ta), titanium (Ti), tungsten Ti) and hafnium (Hf).
  • the metal carbide is tungsten carbide.
  • the end face(s) on the carbide substrate are formed by any suitable cutting, grinding, stamping, or etching process.
  • the upper layer is polycrystalline diamond (PCD).
  • the upper abrasive layer comprises at least one of synthetic and natural diamond, cubic boron nitride (CBN), wurtzite boron nitride, combinations thereof, and like materials.
  • the polycrystalline material layer (or the diamond table layer) and the substrate are subjected to pressures and temperatures sufficient to effect intercrystalline bonding in the polycrystalline material, and create a solid polycrystalline material layer.
  • chemical vapor deposition may also be used to deposit the polycrystalline material on the substrate. This is accomplished by coating the particles of the individual diamond crystals with various metals such as tungsten, tantalum, niobium, or molybdenum, and the like by chemical vapor techniques using fluidized bed procedure. Chemical vapor deposition techniques are also known in the art which utilize plasma assisted or heated filament methods.
  • FEA finite element stress analyses
  • the inventive cutter has an increased useful life with the reduced thermally induced residual radial and axial stresses in the abrasive layer. In another embodiment, the inventive cutter demonstrates increased impact performance and extended working life.
  • maximum axial, radial, and hoop tensile stresses can be greatly reduced by introducing the outwardly slope with proper height ratio between center diamond table thickness and periphery thickness.
  • S a there is an optimized height ratio range of PCD center thickness to PCD cutting edge (periphery) thickness, D c :D p , to achieve minimized diamond table surface stresses. This is illustrated in Figs. I and 2.
  • Figs.1 and 2 display the maximum surface axial stress and radial stress dependent on the slope angle and the height ratio from one FEA study.
  • the hoop stress is not shown here because it is much smaller than axial and radial stresses.
  • the optimum range for minimum axial and radial stresses is very close. In one embodiment for a height ratio of larger than about 0.25, a larger slope angle generally leads to smaller stress. In another embodiment, the optimum slope angle is between about 40° and about 50°, as higher angles tend to cause manufacturing difficulty. For a given slope angle, there exists a range of height ratios corresponding to minimum residual tensile stress.
  • a factor that affects residual stresses in cutting tools is the shoulder width (S w ) fraction of the radius of diamond table diameter (D d ). As illustrated in Fig. 3, the residual stress increases with shoulder width fraction. However, the shoulder can provide the better shaping capability and flexibility for post-sintering finishing. In one embodiment, the shoulder width fraction ranges from between about 0.02 and 0.05.
  • the interface can vary in a number of ways to ensure better bonding strength and manufacturing feasibility. This has been demonstrated in the art listed above.
  • the center interface can be slightly concave or convex, and some non-planar patterns can be combined with the outwardly sloped design. As long as the outwardly slope interface for the cutting tool is optimized based on the precepts of the present invention, the residual stresses can be minimized.
  • the cutting tool inserts are based on cylindrical supports having a diameter that ranges from between about 6 and 30 mm. This also is the nominal diameter, D d , of the abrasive compact upper surface. In another embodiment, the height of the abrasive particle at its periphery, D p , ranges from about 3 to about 6 mm in thickness. Using a practical S w :D d ratio of about 0.1 to about 0.5, translates into the shoulder, S w , having a width of from between about 0.003 and about 0.083 mm.
  • the slope angle, S a ranges from about 40° to 50°.
  • D c :D p ranges from between about 0.1 and 0.8.
  • the D c :D p ratio ranges from about 0.2 and 0.7.
  • the D c :D p ratio ranges from between about 0.3 and 0.6.
  • the D c :D p ratio ranges from about 0.4 and 0.5.
  • a planar interface model cutting tool insert as illustrated in Figs. 4-6, wherein a diamond table, 8, has a diameter, D d ; a diamond table periphery thickness, D p ; a diamond table center thickness, D c ; a slope angle, S a ; and a shoulder width, S w .
  • the illustrated cutting tool insert has a substrate, 10, that has a support face, which includes an inner support table, 12, an outer shoulder, 14, and a downwardly sloping (from support table 12 ) interface, 16, that forms a slope angle, S a , between support table 12 and shoulder 14.
  • support table 12 and shoulder 14 are planar, while interface 16 is linear between support table 12 and shoulder 14. It will be appreciated that the interface between diamond table 8 and support 10 are mirror images. In manufacturing, the interface of diamond table 8 will confirm to the interface of support 10.
  • the cutting tool insert has a slightly curved sloping interface, 18. As shown in the figure, the interface is slightly curved both at its junction with the inner support table, 20, and with the shoulder, 22.
  • the inner support table 24 of the cutter is concentrically grooved from the center of support table 24, to the sloping interface, 26.
  • the concentric grooves are intended to provide better support for and a better bond to the diamond table, 28.
  • the cross-section of these grooves can be of a configuration other than that illustrated.
  • the inner support table 30 has a series of channels that radiate from its center to the sloping interface 32.
  • the number of such channels can be lesser or greater than the number shown. Additionally, the depth and height of each channel can vary from channel to channel. In another embodiment that is not shown, the cross-section of these channels need not be rectangular, but can consist of other geometries as well.
  • the channels in the support substrate 34 serve to provide a better bond for the diamond table 36 that it supports and to which it is bonded.
  • the sloping interface and shoulder can be in any configuration illustrated herein.
  • the cutting tool insert as in previous embodiments is like the insert of Fig. 4, except that the inner support table 38 of the substrate 40, and the diamond table 42, contain a series of substantially parallel channels across its face.
  • the number of such channels can be lesser or greater than the number shown.
  • the depth and height of each channel can also vary from channel to channel.
  • the cross-section of these channels need not be rectangular, but can consist of other geometries as well.
  • the sloping interface and shoulder can be in any configuration illustrated herein.
  • the inner support table 44 of the substrate 46 and the diamond table 48 contain a matrix of substantially parallel intersecting channels (a waffle-like pattern) across its face.
  • the number of such channels can be lesser or greater than the number shown, as can the depth and height of each channel, which can vary from channel to channel. It should be noted that the cross-section of these channels need not be rectangular, but can consist of other geometries as well.
  • the sloping interface and shoulder can be in any configuration illustrated herein.
  • the inner support table 50 of the substrate 52 is domed and contains a series of radiating channels from its center to the sloping interface 56 with the diamond table 54.
  • the number of such channels can be lesser or greater than the number shown, as can the depth and height of each channel, which can vary from channel to channel.
  • the cross-section of these channels is not rounded, but can consist of other geometries.
  • the shape of the dome also can vary.
  • the sloping interface and shoulder can be in any configuration illustrated herein.
  • the inner support table 58 of the substrate 60 contains a series of raised rectangular ridges that radiate from its center to the sloping interface 64 with the diamond table 62.
  • the number of such ridges can be lesser or greater than the number shown, as can the width and height of each ridge, which can vary from ridge to ridge.
  • the cross-section of these ridges need not be rectangular, but can consist of other geometries as well.
  • the sloping interface and shoulder can be in any configuration illustrated herein.
  • the sloping interface 72 between the inner support table 68 and the diamond table 70 is linear (as in Fig. 4), except that it has a series of radiating raised ridges that extend from support table 66 to the shoulder, 74.
  • the number of such ridges can be lesser or greater than the number shown, as can the width and height of each ridges, which can vary from ridge to ridge.
  • the cross-section of these ridges need not be rectangular, but can consist of other geometries as well.
  • the carbide support contains 2 distinctive faces of support for the abrasive material, each face being disposed at an angle (relative to the horizontal) so as to optimized (minimize) radial stress and axial stress.
  • a cutter, 310 is formed from a lower support, 312, and an upper abrasive layer, 314 (see Fig. 32).
  • Support 312 has a central inner face 316 (support table), that extends outwardly and downwardly from an apex or center, 318.
  • Surrounding face 316 is an outer annular face, 320, that extends outwardly and downwardly from the outer periphery of face 316.
  • annular face terminates in a ledge 322 of the outer periphery of annular face 320.
  • superimposed on inner face 316 can be saw tooth annuli and troughs, such as are disclosed in U. S. Patent No. 6,315,652 .
  • outer annular face 320 slopes downwardly from the horizontal at an angle of between about 20° and 75°. In another embodiment, outer annular face slopes downwardly at an angle of about 45°. In another embodiment to optimize (minimize) axial stress, inner face 316 slopes downwardly from the horizontal at an angle of between about 5° and 30°. In yet another embodiment, inner face 316 slopes downwardly at an angle of 7.5°.
  • the outer surface configuration of the diamond (upper abrasive) layer 314 is not critical.
  • the surface configuration of the diamond layer may be in the form of hemispherical, planar, conical, reduced or increased radius, chisel, or non-axisymmetric in shape.
  • all forms of tungsten carbide inserts used in the drilling industry may be enhanced by the addition of a diamond layer, and in one embodiment is further improved by the current invention by addition of a pattern of ridges.
  • the inventive cutter demonstrates an increased useful life with the reduced residual stresses (axial, radial, and hoop tensile) in the abrasive layer at locations where spalling and delamination typically occur.
  • reduced residual stresses is obtained for virtually any size tool insert.
  • the residual tensile stress in cutting tool inserts is significantly reduced with the axial tensile stress decreased by about 90%, the radial tensile stress decreased by about 60%, and the hoop stress becoming completely compressive.
  • the surface axial residual stress is reduced by 83% compared to a flat, planar interface and by 23% compared to a substrate with a single sloped rim.
  • the reduction of the surface axial residual stress increases the impact performance and extends the working lifetime of the cutting tool.
  • Example 1 The following prior art cutters are used, a cutting tool having a flat interface, a cutting tool having a single slope interface with 19 mm diameter, 16 mm overall height, and 3 mm diamond table thickness.
  • a cutting tool with an outer annular face with an angle of 45° with respect to the horizontal, while the inner face angle varied between about 0° and 30° from the horizontal is used.
  • the cutting tool inserts are manufactured by conventional high pressure/high temperature (HP/HT) techniques well known in the art. Such techniques are disclosed, inter alia, in the art cited above.
  • HP/HT high pressure/high temperature
  • the inventive cutter is compared to a single slope tool insert of the prior art.
  • the performance of the cutter on a chamfer piece is measured, with each piece having a carbide chamfer of greater than about 0.2 mm, less than 1.0 mm radial or 45" on the locating base.
  • the cutter (0.010" chamfered edge) sample is mounted in a steel holder, with Rake angle to work piece 7 deg radial/ 12 degrees axial.
  • the cutter is rotated and cuts in an interrupted fashion at a depth of 0.150" and transverse distance of 0.010" through a granite work piece at a cutting speed of 320 rpm and feed rate of about 3" per min. (7.62 cm / min).
  • the test is stopped when the diamond table fails, and the number of impacts (entries into the block) counted.
  • the inventive cutter shows unexpected improvement in impact resistance, with a count of 12600 as opposed to 11500 for the prior art cutter.
  • Example 2 In this example, the prior art cutter has a flat interface, 19 mm diameter, 16 mm overall height, 3 mm diamond table thickness.
  • FEA results are shown in Table 2.
  • Table 3 display correlations of shoulder angle (Sa) and diamond table height ratio Dc:Dp as predicted by FEA models. The ratios displayed are approximate.
  • Cutting elements according to one or more of the disclosed embodiments may be employed in combination with cutting elements of the same or other disclosed embodiments, or with conventional cutting elements, in paired or other grouping, including but not limited to, side-by-side and leading/trailing combinations of various configurations.

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Claims (10)

  1. Un élément rapporté pour outil abrasif, lequel comprend :
    (a) un substrat (312) ; et
    (b) une couche abrasive continue (314)
    caractérisé en ce que :
    le substrat (312) a une face interne (316) qui a un centre (318), et une face annulaire (320) qui a une périphérie ;
    ladite face interne (316) allant en pente vers l'extérieur et vers le bas depuis ledit centre (318) à un angle compris dans la gamme allant d'environ 5° à 30° par rapport à l'horizontale;
    ladite face annulaire (320) entourant ladite face interne (316), laquelle face annulaire (320) se termine au niveau de ladite périphérie et va en pente vers le bas et vers l'extérieur depuis ladite face interne à un angle compris entre environ 20° et 75° par rapport à l'horizontale ; et
    la couche abrasive continue (314) a un centre (318), une périphérie formant un bord coupant étant formée de façon solidaire sur ledit substrat, et définissant une interface entre eux.
  2. L'élément rapporté pour outil abrasif de la revendication 1, dans lequel ladite face annulaire (320) se termine en un rebord (322) qui surmonte la périphérie externe de ladite face annulaire (320).
  3. L'élément rapporté pour outil abrasif de l'une ou l'autre d'entre la revendication 1 et la revendication 2, dans lequel ledit substrat comprend du carbure métallique cémenté.
  4. L'élément rapporté pour outil abrasif de la revendication 3, dans lequel ledit carbure métallique cémenté est un ou plusieurs carbures métalliques parmi les carbures métalliques du groupe IVB, du groupe VB, et du groupe VIB.
  5. L'élément rapporté pour outil abrasif de n'importe quelle revendication précédente, dans lequel ladite couche abrasive est un ou plusieurs éléments parmi le diamant, le nitrure de bore cubique, le nitrure de bore wurtzite, et des combinaisons de ceux-ci.
  6. Une méthode pour former un élément rapporté pour outil abrasif, laquelle méthode comprend les étapes de :
    (a) former un substrat (312) ;
    (b) former de façon solidaire sur ledit substrat une couche abrasive continue (314)
    caractérisée en ce que :
    le substrat (312) a une face interne (316) qui a un centre (318), et une face annulaire (320), laquelle face annulaire a une périphérie;
    ladite face interne (316) va en pente vers l'extérieur et vers le bas depuis ledit centre (318) à un angle compris dans la gamme allant d'environ 5° à 30° par rapport à l'horizontale;
    ladite face annulaire (320) se termine au niveau de ladite périphérie et laquelle face annulaire (320) va en pente vers le bas et vers l'extérieur depuis ladite face interne (316) à un angle compris entre environ 20° et 75° par rapport à l'horizontale; et la couche abrasive continue a un centre et une périphérie formant un bord coupant.
  7. La méthode de la revendication 6, dans laquelle ledit substrat comprend du carbure métallique cémenté.
  8. La méthode de la revendication 7, dans laquelle ledit carbure métallique cémenté est un ou plusieurs carbures métalliques parmi les carbures métalliques du groupe IVB, du groupe VB, et du groupe VIB.
  9. La méthode de n'importe laquelle des revendications 6 à 8, dans laquelle ladite couche abrasive est un ou plusieurs éléments parmi le diamant, le nitrure de bore cubique, le nitrure de bore wurtzite, et des combinaisons de ceux-ci.
  10. La méthode de n'importe laquelle des revendications 6 à 9, dans laquelle ledit angle de face annulaire est d'environ 45° par rapport à l'horizontale et ladite face annulaire se termine en un rebord entourant la périphérie de ladite face annulaire.
EP03764305A 2002-07-10 2003-06-12 Outils de coupe a double profil d'inclinaison Expired - Lifetime EP1527251B1 (fr)

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US39518202P 2002-07-10 2002-07-10
US39518102P 2002-07-10 2002-07-10
US395181P 2002-07-10
US395182P 2002-07-10
PCT/US2003/018692 WO2004007901A1 (fr) 2002-07-10 2003-06-12 Outils de coupe a double profil d'inclinaison

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US9138872B2 (en) 2013-03-13 2015-09-22 Diamond Innovations, Inc. Polycrystalline diamond drill blanks with improved carbide interface geometries

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WO2004076800A1 (fr) * 2003-02-26 2004-09-10 Element Six (Proprietary) Limited Elément coupant secondaire pour trépan de forage
US8858662B2 (en) * 2011-03-04 2014-10-14 Baker Hughes Incorporated Methods of forming polycrystalline tables and polycrystalline elements
US10107042B2 (en) 2012-09-07 2018-10-23 Smith International, Inc. Ultra-hard constructions with erosion resistance
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AU2003248688A1 (en) 2004-02-02
CN1668827A (zh) 2005-09-14
EP1527251A1 (fr) 2005-05-04
CN100374685C (zh) 2008-03-12

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