|Publication number||US3471921 A|
|Publication date||Oct 14, 1969|
|Filing date||Nov 16, 1966|
|Priority date||Dec 23, 1965|
|Publication number||US 3471921 A, US 3471921A, US-A-3471921, US3471921 A, US3471921A|
|Original Assignee||Shell Oil Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (115), Classifications (12)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Oct. 14, 1969 R. FEENSTRA 3,471,921
METHOD OF CONNECTING A STEEL BLANK TO A TUNGSTEN BIT BODY Filed NOV. 16, 1966 I a '-'-f 3\ FIG. I
ROBIJN FEENSTRA HIS AGENT United States Patent US. Cl. 29473.ll 6 Claims ABSTRACT OF THE DISCLOSURE A steel blank is connected to a tungsten bit body by bonding the contact planes of the body and the blank together at a temperature that is less than the critical temperature of the steel blank so as to avoid the tremendous volume changes that occur in steel at this temperature.
The present invention relates to drill bits employed in drilling oil and gas wells and pertains more particularly to a method of connecting a steel blank to a bit body consisting of a mass of sintered tungsten (e.g., tungsten powder and/or tungsten carbide powder). In particular, the present invention relates to a manner of providing the sintered body of a diamond bit for use in deep well drilling, with a steel tool joint, sub or shank which is suitable for connecting the sintered bit body to a drill string.
Diamond bits are manufactured by filling a graphite mold of the bit body, with tungsten powder and/or the desired places within the mold. To connect the mass to the drill string, a steel blank, which is later provided with a screw thread so as to act as a sub or shank, is placed in the mass of powder filling the mold, after which the mold with the powder and the blank is placed in a suit able furnace. A binder material, such as german silver, is placed on the top of the powder, and the furnace is heated to sintering temperature which is about 1l30 C., and, of course, well below the temperature at which the diamonds would be adversely aifected.
At sintering temperature, the binder material liquefies and flows into the pore space of the powder material, as well as between the powder material and the wall of the steel blank. Cooling down of the mold with its contents causes solidification of the binder material, thereby forming an integral mass of the powder material containing the diamonds, to which mass the steel blank is attached. A screw thread is thereafter cut on the blank, thereby converting it into a sub or tool joint pin which is suitable to be connected to the lower end of a drill collar.
It has been found, however, that due to the difference in the expansion coefficients of the sintered mass and the steel blank the sintered mass will be liable to crack during the cooling period. In addition, this weakens the bond between the blank and the sintered mass, and it also distorts the sintered mass which will adversely affect the cutting properties of the diamonds carried by the sintered mass.
A possible solution for the above problem is the use of a number of small metal plugs, provided with internal screw threads, which plugs are sintered together with the powder, and allow the application of a flange connected to a sub, which flange is provided with openings carrying bolts for connecting this flange to the sintered bit body. Since the dimensions of these plugs are small compared to the dimensions of the sintered mass, cracking of the sintered mass does not occur during cooling. Although this construction is very useful for testing diamond bits in the laboratory, it is unsuitable for field use on account of the use of the bolt connections.
It has also been proposed to sinter the powder in the mold together with the diamonds, but without the steel blank. After the sintering process is over and the sintered mass has cooled down, the steel blank is brazed with copper to the sintered mass by heating the whole assembly to a temperature which is lower than the sintering temperature. This will result, depending on the construction of the blank and the sintered mass, in cracking of the sintered mass or breaking of the bond between the blank and the sintered mass. If the blank is placed in a groove arranged in the sintered mass, even both phenomena may occur.
Accordingly, the invention is concerned with connecting a steel blank member to a tungsten bit body member consisting of a mass of sintered tungsten powder and/or tungsten carbide powder, by such a method as to obtain a strong bond between the steel blank and the sintered mass, without distortion or cracking of the sintered mass or breaking of the bond between the steel blank and the sintered mass.
According to the invention, the method of connecting a steel blank to a tungsten bit body consists in bonding the contact planes of the mass and the blank together at a temperature which is less than 723 C., the lower. critical temperature of the steel blank. Critical temperatures, also called critical points, of steel are those temperatures at which structural changes take place in the steel while it is in the solid condition. These critical temperatures vary with the rate of heating or cooling of the steel and with different alloys. The lower critical temperature for a steel is that point at which pearlite begins to change into austenite. This lower critical temperature occurs about 723 C. for some pure iron-carbon alloys. The structural change of the steel from pearlite to austenite and vice-versa is accompanied by a volume change of very specific nature. This volume change may be as much as 1.6% over certain temperature ranges.
The bond may be obtained by the application of a bonding composition such as a resin composition which cures at a temperature below 723 C., or by a brazing composition, which has a melting range below 723 C. In other words, the body may be obtained by the application of a bonding composition or agent having an eifective bonding temperature that is less than the lower critical temperature of the steel member. Effective bonding temperature as used herein is that temperature to which the bonding composition must be raised during the course of establishing an elfective bond. The bonding composition may be either a resin composition that cures at a temperature below the lower critical temperature of the steel member or a brazing or soldering composition having a melting point below said critical temperature.
The invention may be carried into practice in various ways, but one specific embodiment will now be described by way of example with reference to the accompanying drawing which shows a longitudinal section of a diamond drill bit which is suitable to drill deep wells through hard rocks.
FIGURE 1 is a section through the assembled tool bit; and
FIGURE 2 is a section through the bit body as molded.
The bit body includes a sintered mass 1 carrying the diamonds 2 and has been formed by means of a mold 3. The mold consists of graphite, and may be formed by turning a solid block of graphite on a lathe and cutting a negative form of the desired bit design in the block.
The required number of diamonds 2 are then distributed according to a desired pattern in the mold, whereafter the mold is filled with powder material, such as tungsten powder or tungsten carbide, suitable to be bonded together by a binder material. If desired, the outer wall 4 of the mass 1 may be formed by tungsten carbide powder, whereas the interior layer is constituted by tungsten powder. An annular channel 6 may be formed in the tungsten powder mass 5 by placing a graphite ring 6a of the dimensions corresponding to the channel 6 in the mass of tungsten powder 5.
After the mold 3 has been filled with the required amounts of tungsten 5 and tungsten carbide 4, an amount of suitable binder material, such as german silver consisting of 65 vol. percent copper, 18 vol. percent nickel and 17 vol. percent zinc, is placed on top of the tungsten carbide powder 4 and/or tungsten powder 5. Thereafter the mold 3 with its contents is placed in a suitable sintering furnace in which the mold is heated in a neutral atmosphere to a temperature higher than the melting temperature of the binder material. When applying german silver as a binder, the sintering temperature of 1130 C. will be suflicient since the melting range of this binder is 1120 C.
On melting, the binder material sweeps through the pore space of the powdered masses 4 and 5 and is evenly distributed thereover. During the cooling period following the heating period in the furnace, the binder solidifies, thereby strongly bonding the powder particles of the mass 1 to an integral unit. Since the diamonds 2 are for the greater part enclosed by the sintered particles, these diamonds are firmly retained in the sintered mass 1.
After the sintered mass 1 has cooled down to ambient temperature, the graphite mold 3, as well as the ring in the channel 6, if present, is removed from the body 1 (e.g., by destroying). Thereafter the body 1 is placed on a lathe and the form and dimensions of the channel 6 are brought into accordance with the lower end of the metal blank 7 by means of a cutting tool.
The metal blank 7 comprises a lower part 8 which is preferably of a cross-section which is substantially of the same shape as the cross-section of the body 1. The clearance between the blank 7 and the body 1 has been calculated such that at brazing temperature, it has a clearance suitable for brazing (e.g., about 0.1 millimeter).
The upper part 9 of the blank 7 has an external screw thread 10, which enables the body 1 to be connected by screwing action to a drill collar or drill string suitable so that it can be lowered into a borehole and be rotated therein under a load sufiiciently high to have the diamonds 2 exert a scraping action on the bottom of this hole for increasing the depth thereof. The screw thread 10 is not cut into the blank 7 until after the latter has been connected to the body 1.
After the blank 7 has been placed in the channel 6, and the body 1 and the blank 7 have been put into a heating furnace and have been heated to a temperature lower than 723 C., the critical temperature of the steel blank, a very small clearance will remain between the outer wall of the blank 7 and the inner wall of the channel 6. An amount of low temperature brazing composition is placed at one side of the blank 7 just above the clearance between the blank 7 and the channel 6. The brazing composition, on melting, flows into the clearance and fills it completely.
A suitable brazing composition is formed by a silver solder comprising 50 vol. percent silver, 18 vol. percent cadmium, 16.5 vol. percent zinc and 15.5 vol. percent copper. Since the flow point of this solder is about 635 C., a furnace temperature between 635 C. and 723 C. is sufiicient to heat the solder to a temperature above its melting range. The space around the contact planes which are to be bonded by the solder is filled with nitrogen gas to decrease the danger of carbonisation of the steel.
By gradually cooling down the furnace to ambient temabove 723 C., its lower critical temperature, this temperature being the bottom temperature of a temperature range over which pearlite is converted into austenite when the temperature of the steel is raised, and over which austenite is converted into pearlite when the temperature of the steel is lowered.
These conversions from pearlite to austenite and viceversa are accompanied by volume changes of a very specific nature. Thus, on cooling down steel over the temperature range of maximum 910 C. to 723 C., an increase of volume of 1.6% will occur. Since the shrinking action of the sintered mass, however, is quite normal when cooling it down from a high temperature, it will become apparent that in a construction such as the present diamond bit, in which the steel blank and the sintered body have a very'close fit, undesired stresses will occur when cooling this construction over the above-mentioned temperature range of 910 C. to 723 C., in particular when a bond has already been formed between the steel blank and the sintered-body.
It will be clear that, by applying methods in which the bond between the contact planes of the steel blank and the sintered body is formed at a temperature lower than 723 C., the lower critical temperature of the steel member, no problems regarding overstressing of the construction will occur. One of the methods which makes use of a low-temperature brazing solder has already been described above. It will be appreciated that the invention is not restricted to the particular type of solder or bonding composition used in the above explanation of the invention, but that any other type of brazing solder or bonding composition may be used which has a flow point or melting range which is lower than 723 C., the lower critical temperature of the steel member, and is capable of forming a sufiiciently strong bond between the available areas of the contact planes of the blank and the body.
Another way of obtaining a bond between the blank and the body without creating undesired stresses within these components of the bit in the use of a bonding composition such as a resin which will cure at a temperature lower than 723 C., the lower critical temperature of the steel member, and sufiiciently adhere to the blank as well as to the body to withstand the forces which are exerted in the bond between the contact planes of the bit components when the bit is in operation in drilling a hole in an underground formation. One example of such resins is a glycidyl polyether of 2,2-bis(4-hydroxyphenyl)propane, known under the tradename of Epon resins, which can be cured, depending on the curing agent and the curing period, at any temperature between room temperature and 200 C.
It will be obvious that various modifications may be made in the method and apparatus according to the invention and that the specific details of the method and apparatus as described herein are merely illustrative.
I claim as my invention:
1. Method of minimizing dilferential expansion and contraction between a steel blank member and a sintered tungsten earth drill bit member while permanently bonding said members together, comprising the steps of:
forming one of said members with a recessed portion;
forming the other of said members with a portion dimensioned to mate with said recessed portion in spaced relationship at maximum bonding temperature;
placing said portion of said other member within said recessed portion; maintaining said portions in spaced relation at said maximum bonding temperature;
providing a bonding composition having an efiective bonding temperature that is less than the minimum critical temperature of said steel member;
placing said bonding composition in the space formed upon the mating of said members;
applying heat to said bonding composition at a temperature 'sufficient to bring said bonding composition substantially to its effective bonding temperature; and cooling said members to ambient temperature to effect a permanent bond between said members, thereby minimizing the stressing of said members, and eliminating the cracking and distortion of said bit member and the weakening of said bond. 2. The method of claim 1 including the step of: adding diamonds to the surface of said sintered tungsten bit, said diamond inclusions having at least a portion thereof exposed. 3. The method of claim 1 including the further step of: exposing at least the mating portions of said members with an inert gas during at least said heating step. 4. The method of claim 1 wherein the step of providing said bonding composition comprises employing a resin which will cure at a temperature of less than the critical temperature of said steel member.
5. The method of claim 3 wherein the step of providing said bonding composition comprises employing a.
brazing solder having a melting point which is lower than the critical temperature of said steel member.
6. The method of claim 1 wherein the step of applying heat to said bonding composition comprises applying heat to at least one of said members.
References Cited JOHN F. CAMPBELL, Primary Examiner J. L. CLINE, Assistant Examiner US. Cl. X.R.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1977845 *||May 23, 1932||Oct 23, 1934||Cleveland Twist Drill Co||Cutting and forming tool, implement, and the like and method of making same|
|US2457156 *||Jan 12, 1946||Dec 28, 1948||Jones John Paul||Method of manufacturing diamond studded tools|
|US2582231 *||Feb 5, 1949||Jan 15, 1952||Wheel Trueing Tool Co||Abrasive tool and method of making same|
|US3279049 *||Dec 5, 1963||Oct 18, 1966||Chromalloy Corp||Method for bonding a sintered refractory carbide body to a metalliferous surface|
|US3284174 *||Apr 16, 1962||Nov 8, 1966||Ind Fernand Courtoy Bureau Et||Composite structures made by bonding ceramics, cermets, alloys, heavy alloys and metals of different thermal expansion coefficient|
|US3294186 *||Jun 22, 1964||Dec 27, 1966||Tartan Ind Inc||Rock bits and methods of making the same|
|US3372464 *||Oct 22, 1965||Mar 12, 1968||Pan American Petroleum Corp||Method of bonding carbide to steel|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3599316 *||Dec 15, 1969||Aug 17, 1971||Continental Can Co||Method of joining cemented carbide to steel|
|US3885637 *||Jan 4, 1974||May 27, 1975||Barkov Vasily Andreevich||Boring tools and method of manufacturing the same|
|US3894674 *||Dec 7, 1972||Jul 15, 1975||Weill Theodore C||Process for applying a protective wear surface to a wear part|
|US3900149 *||May 4, 1973||Aug 19, 1975||Grigory Bagradovich Asoyants||Method of producing anti-skid studs for vehicle tires|
|US4136813 *||Mar 28, 1977||Jan 30, 1979||Lucas Industries Limited||Joining a pair of parts|
|US5090491 *||Mar 4, 1991||Feb 25, 1992||Eastman Christensen Company||Earth boring drill bit with matrix displacing material|
|US5839329 *||Sep 24, 1996||Nov 24, 1998||Baker Hughes Incorporated||Method for infiltrating preformed components and component assemblies|
|US6073518 *||Sep 24, 1996||Jun 13, 2000||Baker Hughes Incorporated||Bit manufacturing method|
|US6082461 *||Jun 24, 1998||Jul 4, 2000||Ctes, L.C.||Bore tractor system|
|US6089123 *||Apr 16, 1998||Jul 18, 2000||Baker Hughes Incorporated||Structure for use in drilling a subterranean formation|
|US6200514||Feb 9, 1999||Mar 13, 2001||Baker Hughes Incorporated||Process of making a bit body and mold therefor|
|US6209420||Aug 17, 1998||Apr 3, 2001||Baker Hughes Incorporated||Method of manufacturing bits, bit components and other articles of manufacture|
|US6354362||Nov 17, 1998||Mar 12, 2002||Baker Hughes Incorporated||Method and apparatus for infiltrating preformed components and component assemblies|
|US6454030||Jan 25, 1999||Sep 24, 2002||Baker Hughes Incorporated||Drill bits and other articles of manufacture including a layer-manufactured shell integrally secured to a cast structure and methods of fabricating same|
|US6581671||Mar 11, 2002||Jun 24, 2003||Baker Hughes Incorporated||System for infiltrating preformed components and component assemblies|
|US6655481||Jun 25, 2002||Dec 2, 2003||Baker Hughes Incorporated||Methods for fabricating drill bits, including assembling a bit crown and a bit body material and integrally securing the bit crown and bit body material to one another|
|US7398840||Jan 10, 2006||Jul 15, 2008||Halliburton Energy Services, Inc.||Matrix drill bits and method of manufacture|
|US7597159||Sep 9, 2005||Oct 6, 2009||Baker Hughes Incorporated||Drill bits and drilling tools including abrasive wear-resistant materials|
|US7625521||Jun 5, 2003||Dec 1, 2009||Smith International, Inc.||Bonding of cutters in drill bits|
|US7703555||Aug 30, 2006||Apr 27, 2010||Baker Hughes Incorporated||Drilling tools having hardfacing with nickel-based matrix materials and hard particles|
|US7775287||Dec 12, 2006||Aug 17, 2010||Baker Hughes Incorporated||Methods of attaching a shank to a body of an earth-boring drilling tool, and tools formed by such methods|
|US7776256||Aug 17, 2010||Baker Huges Incorporated||Earth-boring rotary drill bits and methods of manufacturing earth-boring rotary drill bits having particle-matrix composite bit bodies|
|US7784381||Aug 31, 2010||Halliburton Energy Services, Inc.||Matrix drill bits and method of manufacture|
|US7784567||Aug 31, 2010||Baker Hughes Incorporated||Earth-boring rotary drill bits including bit bodies comprising reinforced titanium or titanium-based alloy matrix materials, and methods for forming such bits|
|US7802495||Nov 10, 2005||Sep 28, 2010||Baker Hughes Incorporated||Methods of forming earth-boring rotary drill bits|
|US7841259||Dec 27, 2006||Nov 30, 2010||Baker Hughes Incorporated||Methods of forming bit bodies|
|US7913779||Sep 29, 2006||Mar 29, 2011||Baker Hughes Incorporated||Earth-boring rotary drill bits including bit bodies having boron carbide particles in aluminum or aluminum-based alloy matrix materials, and methods for forming such bits|
|US7954569||Apr 28, 2005||Jun 7, 2011||Tdy Industries, Inc.||Earth-boring bits|
|US7997358||Oct 20, 2009||Aug 16, 2011||Smith International, Inc.||Bonding of cutters in diamond drill bits|
|US7997359||Sep 27, 2007||Aug 16, 2011||Baker Hughes Incorporated||Abrasive wear-resistant hardfacing materials, drill bits and drilling tools including abrasive wear-resistant hardfacing materials|
|US8002052||Aug 23, 2011||Baker Hughes Incorporated||Particle-matrix composite drill bits with hardfacing|
|US8007714||Aug 30, 2011||Tdy Industries, Inc.||Earth-boring bits|
|US8007922||Oct 25, 2007||Aug 30, 2011||Tdy Industries, Inc||Articles having improved resistance to thermal cracking|
|US8025112||Sep 27, 2011||Tdy Industries, Inc.||Earth-boring bits and other parts including cemented carbide|
|US8074750||Dec 13, 2011||Baker Hughes Incorporated||Earth-boring tools comprising silicon carbide composite materials, and methods of forming same|
|US8087324||Apr 20, 2010||Jan 3, 2012||Tdy Industries, Inc.||Cast cones and other components for earth-boring tools and related methods|
|US8104550||Jan 31, 2012||Baker Hughes Incorporated||Methods for applying wear-resistant material to exterior surfaces of earth-boring tools and resulting structures|
|US8109177 *||Oct 12, 2005||Feb 7, 2012||Smith International, Inc.||Bit body formed of multiple matrix materials and method for making the same|
|US8137816||Aug 4, 2010||Mar 20, 2012||Tdy Industries, Inc.||Composite articles|
|US8172914||May 8, 2012||Baker Hughes Incorporated||Infiltration of hard particles with molten liquid binders including melting point reducing constituents, and methods of casting bodies of earth-boring tools|
|US8176812||May 15, 2012||Baker Hughes Incorporated||Methods of forming bodies of earth-boring tools|
|US8201610||Jun 5, 2009||Jun 19, 2012||Baker Hughes Incorporated||Methods for manufacturing downhole tools and downhole tool parts|
|US8221517||Jun 2, 2009||Jul 17, 2012||TDY Industries, LLC||Cemented carbide—metallic alloy composites|
|US8225886||Jul 24, 2012||TDY Industries, LLC||Earth-boring bits and other parts including cemented carbide|
|US8230762||Feb 7, 2011||Jul 31, 2012||Baker Hughes Incorporated||Methods of forming earth-boring rotary drill bits including bit bodies having boron carbide particles in aluminum or aluminum-based alloy matrix materials|
|US8261632||Jul 9, 2008||Sep 11, 2012||Baker Hughes Incorporated||Methods of forming earth-boring drill bits|
|US8268452||Jul 31, 2007||Sep 18, 2012||Baker Hughes Incorporated||Bonding agents for improved sintering of earth-boring tools, methods of forming earth-boring tools and resulting structures|
|US8272816||May 12, 2009||Sep 25, 2012||TDY Industries, LLC||Composite cemented carbide rotary cutting tools and rotary cutting tool blanks|
|US8308096||Jul 14, 2009||Nov 13, 2012||TDY Industries, LLC||Reinforced roll and method of making same|
|US8309018||Jun 30, 2010||Nov 13, 2012||Baker Hughes Incorporated||Earth-boring rotary drill bits and methods of manufacturing earth-boring rotary drill bits having particle-matrix composite bit bodies|
|US8312941||Nov 20, 2012||TDY Industries, LLC||Modular fixed cutter earth-boring bits, modular fixed cutter earth-boring bit bodies, and related methods|
|US8317893||Nov 27, 2012||Baker Hughes Incorporated||Downhole tool parts and compositions thereof|
|US8318063||Nov 27, 2012||TDY Industries, LLC||Injection molding fabrication method|
|US8322465||Aug 22, 2008||Dec 4, 2012||TDY Industries, LLC||Earth-boring bit parts including hybrid cemented carbides and methods of making the same|
|US8388723||Feb 8, 2010||Mar 5, 2013||Baker Hughes Incorporated||Abrasive wear-resistant materials, methods for applying such materials to earth-boring tools, and methods of securing a cutting element to an earth-boring tool using such materials|
|US8403080||Mar 26, 2013||Baker Hughes Incorporated||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|
|US8440314||May 14, 2013||TDY Industries, LLC||Coated cutting tools having a platinum group metal concentration gradient and related processes|
|US8459380||Jun 11, 2013||TDY Industries, LLC||Earth-boring bits and other parts including cemented carbide|
|US8464814||Jun 10, 2011||Jun 18, 2013||Baker Hughes Incorporated||Systems for manufacturing downhole tools and downhole tool parts|
|US8490674||May 19, 2011||Jul 23, 2013||Baker Hughes Incorporated||Methods of forming at least a portion of earth-boring tools|
|US8512882||Feb 19, 2007||Aug 20, 2013||TDY Industries, LLC||Carbide cutting insert|
|US8637127||Jun 27, 2005||Jan 28, 2014||Kennametal Inc.||Composite article with coolant channels and tool fabrication method|
|US8647561||Jul 25, 2008||Feb 11, 2014||Kennametal Inc.||Composite cutting inserts and methods of making the same|
|US8697258||Jul 14, 2011||Apr 15, 2014||Kennametal Inc.||Articles having improved resistance to thermal cracking|
|US8758462||Jan 8, 2009||Jun 24, 2014||Baker Hughes Incorporated||Methods for applying abrasive wear-resistant materials to earth-boring tools and methods for securing cutting elements to earth-boring tools|
|US8770324||Jun 10, 2008||Jul 8, 2014||Baker Hughes Incorporated||Earth-boring tools including sinterbonded components and partially formed tools configured to be sinterbonded|
|US8789625||Oct 16, 2012||Jul 29, 2014||Kennametal Inc.||Modular fixed cutter earth-boring bits, modular fixed cutter earth-boring bit bodies, and related methods|
|US8790439||Jul 26, 2012||Jul 29, 2014||Kennametal Inc.||Composite sintered powder metal articles|
|US8800848||Aug 31, 2011||Aug 12, 2014||Kennametal Inc.||Methods of forming wear resistant layers on metallic surfaces|
|US8808591||Oct 1, 2012||Aug 19, 2014||Kennametal Inc.||Coextrusion fabrication method|
|US8841005||Oct 1, 2012||Sep 23, 2014||Kennametal Inc.||Articles having improved resistance to thermal cracking|
|US8858870||Jun 8, 2012||Oct 14, 2014||Kennametal Inc.||Earth-boring bits and other parts including cemented carbide|
|US8869920||Jun 17, 2013||Oct 28, 2014||Baker Hughes Incorporated||Downhole tools and parts and methods of formation|
|US8905117||May 19, 2011||Dec 9, 2014||Baker Hughes Incoporated||Methods of forming at least a portion of earth-boring tools, and articles formed by such methods|
|US8978734||May 19, 2011||Mar 17, 2015||Baker Hughes Incorporated||Methods of forming at least a portion of earth-boring tools, and articles formed by such methods|
|US9016406||Aug 30, 2012||Apr 28, 2015||Kennametal Inc.||Cutting inserts for earth-boring bits|
|US9027674||Jun 22, 2011||May 12, 2015||Halliburton Energy Services, Inc.||Custom shaped blank|
|US9192989||Jul 7, 2014||Nov 24, 2015||Baker Hughes Incorporated||Methods of forming earth-boring tools including sinterbonded components|
|US9200485||Feb 9, 2011||Dec 1, 2015||Baker Hughes Incorporated||Methods for applying abrasive wear-resistant materials to a surface of a drill bit|
|US9266171||Oct 8, 2012||Feb 23, 2016||Kennametal Inc.||Grinding roll including wear resistant working surface|
|US9428822||Mar 19, 2013||Aug 30, 2016||Baker Hughes Incorporated||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|
|US9435010||Aug 22, 2012||Sep 6, 2016||Kennametal Inc.||Composite cemented carbide rotary cutting tools and rotary cutting tool blanks|
|US9435158 *||Oct 11, 2012||Sep 6, 2016||Varel International Ind., L.P||Use of tungsten carbide tube rod to hard-face PDC matrix|
|US20040245022 *||Jun 5, 2003||Dec 9, 2004||Izaguirre Saul N.||Bonding of cutters in diamond drill bits|
|US20060032335 *||Oct 12, 2005||Feb 16, 2006||Kembaiyan Kumar T||Bit body formed of multiple matrix materials and method for making the same|
|US20060231293 *||Jan 10, 2006||Oct 19, 2006||Ladi Ram L||Matrix drill bits and method of manufacture|
|US20070056776 *||Sep 9, 2005||Mar 15, 2007||Overstreet James L||Abrasive wear-resistant materials, drill bits and drilling tools including abrasive wear-resistant materials, methods for applying abrasive wear-resistant materials to drill bits and drilling tools, and methods for securing cutting elements to a drill bit|
|US20070056777 *||Aug 30, 2006||Mar 15, 2007||Overstreet James L||Composite materials including nickel-based matrix materials and hard particles, tools including such materials, and methods of using such materials|
|US20070102202 *||Nov 6, 2006||May 10, 2007||Baker Hughes Incorporated||Earth-boring rotary drill bits including bit bodies comprising reinforced titanium or titanium-based alloy matrix materials, and methods for forming such bits|
|US20080029310 *||Jun 27, 2007||Feb 7, 2008||Stevens John H||Particle-matrix composite drill bits with hardfacing and methods of manufacturing and repairing such drill bits using hardfacing materials|
|US20080073125 *||Sep 27, 2007||Mar 27, 2008||Eason Jimmy W||Abrasive wear resistant hardfacing materials, drill bits and drilling tools including abrasive wear resistant hardfacing materials, and methods for applying abrasive wear resistant hardfacing materials to drill bits and drilling tools|
|US20080083568 *||Sep 28, 2007||Apr 10, 2008||Overstreet James L||Methods for applying wear-resistant material to exterior surfaces of earth-boring tools and resulting structures|
|US20080101977 *||Oct 31, 2007||May 1, 2008||Eason Jimmy W||Sintered bodies for earth-boring rotary drill bits and methods of forming the same|
|US20080127781 *||Jan 18, 2008||Jun 5, 2008||Ladi Ram L||Matrix drill bits and method of manufacture|
|US20080135304 *||Dec 12, 2006||Jun 12, 2008||Baker Hughes Incorporated||Methods of attaching a shank to a body of an earth-boring drilling tool, and tools formed by such methods|
|US20080163723 *||Feb 20, 2008||Jul 10, 2008||Tdy Industries Inc.||Earth-boring bits|
|US20080202814 *||Feb 23, 2007||Aug 28, 2008||Lyons Nicholas J||Earth-boring tools and cutter assemblies having a cutting element co-sintered with a cone structure, methods of using the same|
|US20080302576 *||Aug 15, 2008||Dec 11, 2008||Baker Hughes Incorporated||Earth-boring bits|
|US20090031863 *||Jul 31, 2007||Feb 5, 2009||Baker Hughes Incorporated||Bonding agents for improved sintering of earth-boring tools, methods of forming earth-boring tools and resulting structures|
|US20090308662 *||Dec 17, 2009||Lyons Nicholas J||Method of selectively adapting material properties across a rock bit cone|
|US20100000798 *||Jun 23, 2009||Jan 7, 2010||Patel Suresh G||Method to reduce carbide erosion of pdc cutter|
|US20100006345 *||Jul 9, 2008||Jan 14, 2010||Stevens John H||Infiltrated, machined carbide drill bit body|
|US20100044114 *||Feb 25, 2010||Tdy Industries, Inc.||Earth-boring bits and other parts including cemented carbide|
|US20100132265 *||Feb 8, 2010||Jun 3, 2010||Baker Hughes Incorporated||Abrasive wear-resistant materials, methods for applying such materials to earth-boring tools, and methods of securing a cutting element to an earth-boring tool using such materials|
|US20100263935 *||Jun 30, 2010||Oct 21, 2010||Baker Hughes Incorporated||Earth boring rotary drill bits and methods of manufacturing earth boring rotary drill bits having particle matrix composite bit bodies|
|US20100276205 *||Nov 4, 2010||Baker Hughes Incorporated||Methods of forming earth-boring rotary drill bits|
|US20100288821 *||Nov 18, 2010||Ladi Ram L||Matrix Drill Bits and Method of Manufacture|
|US20100303566 *||Aug 4, 2010||Dec 2, 2010||Tdy Industries, Inc.||Composite Articles|
|US20100307838 *||Dec 9, 2010||Baker Hughes Incorporated||Methods systems and compositions for manufacturing downhole tools and downhole tool parts|
|US20100326739 *||Sep 3, 2010||Dec 30, 2010||Baker Hughes Incorporated||Earth-boring tools comprising silicon carbide composite materials, and methods of forming same|
|US20110094341 *||Aug 30, 2010||Apr 28, 2011||Baker Hughes Incorporated||Methods of forming earth boring rotary drill bits including bit bodies comprising reinforced titanium or titanium based alloy matrix materials|
|US20110138695 *||Jun 16, 2011||Baker Hughes Incorporated||Methods for applying abrasive wear resistant materials to a surface of a drill bit|
|US20110142707 *||Jun 16, 2011||Baker Hughes Incorporated||Methods of forming earth boring rotary drill bits including bit bodies having boron carbide particles in aluminum or aluminum based alloy matrix materials|
|US20130092453 *||Oct 11, 2012||Apr 18, 2013||Charles Daniel Johnson||Use of tungsten carbide tube rod to hard-face pdc matrix|
|EP0312487A1 *||Oct 12, 1988||Apr 19, 1989||Eastman Teleco Company||Earth boring drill bit with matrix displacing material|
|U.S. Classification||228/124.1, 76/108.1, 228/219|
|International Classification||C09J163/00, E21B10/46, B23K35/30|
|Cooperative Classification||E21B10/46, B23K35/3006, C09J163/00|
|European Classification||C09J163/00, E21B10/46, B23K35/30B|