CN113250623A - Function-partitioned impregnated tooth, preparation method thereof and drill bit - Google Patents
Function-partitioned impregnated tooth, preparation method thereof and drill bit Download PDFInfo
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- CN113250623A CN113250623A CN202110527996.1A CN202110527996A CN113250623A CN 113250623 A CN113250623 A CN 113250623A CN 202110527996 A CN202110527996 A CN 202110527996A CN 113250623 A CN113250623 A CN 113250623A
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- 238000003466 welding Methods 0.000 claims abstract description 49
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 46
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
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- 239000007787 solid Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000005192 partition Methods 0.000 claims abstract description 6
- 238000001513 hot isostatic pressing Methods 0.000 claims description 14
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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
- E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
-
- 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
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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Abstract
The invention discloses an impregnated tooth partitioned according to functions, which comprises: the drill bit comprises a welding area and a working area which are integrally formed, wherein the welding area is welded on a drill bit steel body, the working area is divided into more than or equal to 2 parts along the axis of a pregnant inlaid tooth, N is an integer, the welding area is composed of metal powder, each part of the working area is composed of metal powder, diamonds with different parameters and solid lubricants with different volume concentrations, and the abrasive resistance of the Nth part of the working area is weaker than that of the N-1 th part; the invention also provides a preparation method of the pregnant inlaid tooth according to the functional partition. The impregnated teeth are divided into the working area and the welding area, wherein only the working area contains diamond, so that the production cost of the drill bit can be relatively reduced; the material composition of the working area contains solid lubricant material, and a layer of lubricating film can be generated on the frictional wear interface of the impregnated teeth and the drilling object in the drilling process, so that the heat generated by drilling is reduced, and the drill bit is effectively protected.
Description
Technical Field
The invention relates to the technical field of diamond bit drilling. More particularly, the invention relates to a functional partition-based impregnated tooth, a preparation method thereof and a drill bit.
Background
The existing coring bit designed for moon/space drilling uses hard alloy teeth or PDC teeth as main cutting units, and the wear-resistant materials such as diamond or CBN are only used as a strengthening mode for improving the rock breaking capacity of the bit. Research and practice show that through structural optimization design and matching with optimized drilling regulation parameters, the hard alloy drill bit and the PDC drill bit can realize the rock coring operation of limited footage in the earth environment, and the coring task requirement of the lunar soil layer is completed in the lunar environment. However, when the lunar drill encounters lunar rock, the generated frictional heat is significantly higher than that of lunar soil layer drilling, and once the hard alloy tooth or PDC tooth drill encounters lunar rock and then the conditions of dull cutting edge or broken/brittle cutting tooth occur, the high edge-protruding characteristic of the cutting tooth makes self-sharpening difficult to realize, and the drilling process has to be interrupted.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
It is yet another object of the present invention to provide a functionally segmented impregnated tooth that is divided into a working region and a welding region, wherein only the working region contains diamond, thereby relatively reducing the cost of production of the drill bit; the material composition of the working area contains solid lubricant material, and a layer of lubricating film can be generated on the frictional wear interface of the impregnated teeth and the drilling object in the drilling process, so that the heat generated by drilling is reduced, and the drill bit is effectively protected.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a functionally segmented impregnated tooth comprising: the drill bit steel body is integrally formed with a welding area and a working area, the welding area is welded on the drill bit steel body, the working area is divided into more than or equal to 2 parts along the axis of the pregnant inlaid tooth, and N is an integer.
Preferably, the welding zone is composed of metal powder, and each portion of the working zone is composed of metal powder, diamond of different parameters, and solid lubricant of different volume concentration.
Preferably, the abrasion resistance of the nth portion of the working region is weaker than that of the nth-1 portion.
The invention also provides a preparation method of the pregnant inlaid tooth according to the functional subarea, which is characterized in that the diamond-impregnated bit cutting tooth with the PDC appearance and the self-lubricating function is formed by cold press molding and hot press sintering, and then hot isostatic pressing strengthening treatment and geometric dimension correction are carried out on the diamond-impregnated bit cutting tooth to obtain the pregnant inlaid tooth with the functional subarea.
The invention also provides a preparation method of the pregnant insert according to the functional partition, which is characterized in that the impregnated diamond drill bit cutting teeth with the PDC appearance and the self-lubricating function are formed in a 3D printing mode, and then hot isostatic pressing enhancement treatment and geometric size correction are carried out on the impregnated diamond drill bit cutting teeth to obtain the pregnant insert of the functional partition.
The invention also provides a self-lubricating impregnated diamond drill bit, which comprises impregnated inserts partitioned according to functions.
The invention also provides a preparation method of the self-lubricating diamond-impregnated bit, and the impregnated teeth partitioned according to functions are welded on a bit steel body.
The invention at least comprises the following beneficial effects:
the impregnated teeth are designed into a working area and a welding area, wherein only the working area contains diamond, so that the production cost of the drill bit can be relatively reduced;
the material composition of the pregnant inlaid tooth working area contains solid lubricant material, and a layer of lubricating film can be generated on the frictional wear interface of the pregnant inlaid tooth and a drilling object in the drilling process, so that the heat generated by drilling is reduced, and the drill bit is effectively protected;
the impregnated teeth are processed into the shape of the PDC, and the overall strength of the impregnated teeth is enhanced by adopting a hot isostatic pressing mode, so that the impregnated teeth are drilled in a shearing and breaking mode when being drilled into a low-strength material, and a high mechanical drilling speed can be obtained; when the drill encounters a hard object, grinding and drilling the diamond particles with more density from the 2 nd part of the working area after the 1 st part of the impregnated tooth working area fails;
the invention adopts the manufacturing method of cold press molding, high temperature sintering and hot isostatic pressing enhancement to realize that the macroscopic mechanical property and the frictional wear property of the impregnated tooth working area along the axial direction change according to the requirement, thereby realizing self shape preservation of the impregnated tooth in the drilling process;
according to the invention, the 3D printing additive manufacturing method is adopted, so that the macroscopic mechanical property and the frictional wear property of the impregnated tooth working area in the axial direction are changed as required, and the impregnated tooth is enabled to realize self shape preservation in the drilling process.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of the construction of the working and welding zones of the impregnated insert of the present invention;
fig. 2 is a cross-sectional view of the working area and welding area of the impregnated insert of the present invention.
Detailed Description
The invention provides an impregnated tooth partitioned according to functions, as shown in figures 1 and 2, comprising: the bit steel body is welded on the drill bit steel body, the working area is divided into N parts which are more than or equal to 2 parts along the axis of the pregnant inlaid tooth, and N is an integer.
The weld zone is composed of metal powder, and each portion of the working zone is composed of metal powder, diamond of different parameters, and solid lubricant of different volume concentration.
The abrasion resistance of the Nth part of the working area is weaker than that of the (N-1) th part.
It should be noted that the welding area is divided into two parts, the welding area is in an L-shaped structure, the upper part of the working area is the welding area, and one side of the working area is also the welding area. The structure of the welding zone can be divided into two semi-cylinders with different lengths according to the horizontal plane, and can also be divided into a semi-cylinder and a cylinder according to the horizontal plane and the vertical plane.
The working area can be in various shapes, and the contact interface of the working area and the welding area can be a plane, a cambered surface or a multi-segment line.
It is also noted that the diamond may be a coated diamond and the solid lubricant may be a coated lubricant.
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.
Example 1
The embodiment provides a preparation method of a self-lubricating diamond-impregnated bit, which comprises the following steps:
1) processing a drill bit steel body according to design requirements, and reserving a position for welding PDC-shaped pregnant inlaid teeth (namely, the pregnant inlaid diamond drill bit cutting teeth);
2) dividing the impregnated tooth into a working area and a welding area according to functions, dividing the working area into 3 parts along the axial direction of the impregnated tooth, and dividing the welding area into two parts, namely the welding area 1 and the welding area 2; setting the total length of a working area as L, wherein the length of the 1 st part is 1L/5, and the lengths of the 2 nd part and the 3 rd part are respectively 2L/5;
3) mechanically mixing the solid lubricant with metalized surface with metal powder of a certain formula to form a working area powder 1; mechanically mixing metal powder with a certain formula to form welding area powder 2; the solid lubricant in the powder 1 is nickel-coated graphite powder, the volume concentration is 2-6%, and the mass parts of the metal powder in the powder 1 are as follows: 30 parts of WC, 3060 parts of FeCu and 10 parts of Co; the mass parts of all the substances in the metal powder in the powder material 2 are FeCu 3080 parts, Fe 10 parts and Cu 10 parts;
4) corresponding to 3 parts of the pregnant inlaid tooth working area, 3 kinds of diamond with parameter proportion are respectively designed. Wherein, the No. 1 seed is 40 parts of 50-60 meshes and 60 parts of 80-100 meshes; the 2 nd seed is 40 parts of 40-45 meshes and 60 parts of 50-60 meshes; the 3 rd seed is 20 parts of 50-60 meshes and 80-100 meshes; wherein, the 1 st diamond and the 2 nd diamond adopt high-grade diamonds after surface metallization, and the 3 rd diamond adopts non-surface metallization diamonds and low-grade diamonds;
5) respectively mixing the 3 kinds of diamond obtained in the step 4) with the working area powder 1 to form working area powder 1-1, 1-2 and 1-3, wherein the volume concentration of the 1 st diamond in the working area powder 1-1 is 50%, the volume concentration of the 2 nd diamond in the working area powder 1-2 is 25%, and the volume concentration of the 3 rd diamond in the working area powder 1-3 is 5%, and respectively preparing blanks 1-1, 1-2 and 1-3 by adopting a cold press;
6) dividing the powder 2 in the welding area into 2-1 and 2-2 according to the design structure, and respectively preparing blanks 2-1 and 2-2 by adopting a cold press;
7) assembling the blanks in a graphite mold according to a design target, and performing hot-pressing sintering by adopting a resistance furnace to form the impregnated insert with the PDC appearance and the self-lubricating function;
8) carrying out hot isostatic pressing enhancement treatment on the impregnated tooth prepared by cold press molding and hot press sintering in a protective atmosphere environment, so that the overall mechanical strength and the wear resistance of the impregnated tooth are further improved;
9) carrying out size correction on the impregnated tooth after the hot isostatic pressing treatment;
10) and (3) contacting the welding zone of the impregnated insert with the drill bit steel body, and fixing the impregnated insert on the drill bit steel body in a welding mode, thereby obtaining the impregnated diamond drill bit with self-lubricating function and PDC appearance.
Example 2
The embodiment provides a preparation method of a self-lubricating diamond-impregnated bit, which comprises the following steps:
1) processing a drill bit steel body according to design requirements, and reserving a position for welding PDC-shaped pregnant inlaid teeth (namely, the pregnant inlaid diamond drill bit cutting teeth);
2) the impregnated tooth is divided into a working area and a welding area according to functions, the working area is equally divided into 5 parts along the axial direction of the impregnated tooth, and the welding area is divided into 2 parts;
3) mechanically mixing the solid lubricant with metalized surface with metal powder of a certain formula to form a working area powder 1, and equally dividing the working area powder into 5 parts; mechanically mixing metal powder according to a certain formula to form welding area powder 2, and dividing the welding area powder into 2 parts according to the volume occupied by the structure of the welding area; wherein the solid lubricant in the powder material 1 is nickel-coated graphite powder, and the volume concentration is 2-6%; the metal powder in the powder 1 and the powder 2 is single FeCu30 powder;
4) corresponding to 5 parts of the pregnant and inserted tooth working area, 5 diamonds with different parameter ratios are respectively designed and arranged in different hoppers. Wherein the 1 st seed is 80-100 meshes; the 2 nd seed is 40 parts of 30-40 meshes and 60 parts of 40-50 meshes; the 3 rd seed is 40 parts of 40-50 meshes and 60 parts of 50-60 meshes; the 4 th seed is 40 parts of 60-80 meshes and 60 parts of 80-100 meshes; the 5 th seed is 80-100 meshes; wherein, the 1 st and the 2 nd diamonds are high-grade diamonds, the 3 rd diamonds are middle-grade diamonds, and the 4 th and the 5 th diamonds are low-grade diamonds;
5) mechanically mixing the working area powder 1 with the 5 kinds of diamonds in the step 4), and then preparing working area blanks 1-1, 1-2, 1-3, 1-4 and 1-5 by cold pressing equipment, wherein the volume concentration of the 1 st diamond in the working area powder 1-1 is 45%, the volume concentration of the 2 nd diamond in the working area powder 1-2 is 30%, the volume concentration of the 3 rd diamond in the working area powder 1-3 is 15%, the volume concentration of the 4 th diamond in the working area powder 1-4 is 10%, and the volume concentration of the 5 th diamond in the working area powder 1-5 is 5%; powder materials of a welding area are made into welding area blanks 2-1 and 2-2 according to a welding area mechanism through cold pressing equipment;
6) assembling the blanks in the working area and the blanks in the welding area into a graphite mold according to design requirements, and performing hot-pressing sintering by adopting a medium-frequency heating furnace to obtain the impregnated insert with the PDC appearance and the self-lubricating function;
7) carrying out hot isostatic pressing enhancement treatment on the impregnated tooth prepared by cold press molding and hot press sintering in a protective atmosphere environment, so that the overall mechanical strength and the wear resistance of the impregnated tooth are further improved;
8) carrying out size correction on the cutting teeth subjected to the hot isostatic pressing treatment;
9) and fixing the corrected impregnated teeth on a drill bit steel body in a welding mode, thereby obtaining the impregnated diamond drill bit with the self-lubricating function and the PDC appearance.
Example 3
The embodiment provides a preparation method of a self-lubricating diamond-impregnated bit, which comprises the following steps:
1) processing a drill bit steel body according to design requirements, and reserving a position for welding PDC-shaped pregnant inlaid teeth (namely, the pregnant inlaid diamond drill bit cutting teeth);
2) the impregnated tooth is divided into a working area and a welding area according to functions, and the working area is divided into 3 parts along the axial direction of the impregnated tooth; setting the total length of a working area as L, wherein the length of the 1 st part is 1L/5, and the lengths of the 2 nd part and the 3 rd part are respectively 2L/5;
3) mechanically mixing the solid lubricant with metalized surface with metal powder of a certain formula to form a working area powder 1; mechanically mixing metal powder according to a certain formula to form welding area powder 2; wherein the solid lubricant in the powder 1 is nickel-coated graphite powder, and the volume concentration is 2-6%; the mass parts of all the substances in the metal powder in the powder material 1 are 30 parts of WC, 3060 part of FeCu and 10 parts of Co; the mass parts of all the substances in the metal powder in the powder material 2 are FeCu 3080 parts, Fe 10 parts and Cu 10 parts;
4) corresponding to 3 parts of the pregnant inlaid tooth working area, 3 kinds of diamond with parameter proportion are respectively designed. Wherein, the No. 1 seed is 40 parts of 50-60 meshes and 60 parts of 80-100 meshes; the 2 nd seed is 40 parts of 40-45 meshes and 60 parts of 50-60 meshes; the 3 rd seed is 20 parts of 50-60 meshes and 80-100 meshes; wherein, the 1 st diamond and the 2 nd diamond adopt high-grade diamonds after surface metallization, and the 3 rd diamond adopts non-surface metallization diamonds and is low-grade diamonds;
5) respectively mixing 3 kinds of diamonds with the working area powder 1 with corresponding volume to form working area powder 1-1, 1-2 and 1-3, wherein the volume concentration of the 1 st diamond in the working area powder 1-1 is 50%, the volume concentration of the 2 nd diamond in the working area powder 1-2 is 25%, and the volume concentration of the 3 rd diamond in the working area powder 1-3 is 5%;
6) in 3D printing equipment, according to impregnated teeth design geometric parameters, forming impregnated teeth layer by layer along the axial direction of the impregnated teeth;
7) carrying out hot isostatic pressing enhancement treatment on the impregnated teeth formed by 3D printing in a protective atmosphere environment, so that the overall mechanical strength and the wear resistance of the impregnated teeth are further improved;
8) carrying out size correction on the cutting teeth subjected to the hot isostatic pressing treatment;
9) and (3) contacting the welding zone of the impregnated insert with the drill bit steel body, and fixing the impregnated insert on the drill bit steel body in a welding mode, thereby obtaining the impregnated diamond drill bit with self-lubricating function and PDC appearance.
Example 4
The embodiment provides a preparation method of a self-lubricating diamond-impregnated bit, which comprises the following steps:
1) processing a drill bit steel body according to design requirements, and reserving a position for welding PDC-shaped pregnant inlaid teeth (namely, the pregnant inlaid diamond drill bit cutting teeth);
2) the impregnated tooth is divided into a working area and a welding area according to functions, and the working area is equally divided into 5 parts along the axial direction of the impregnated tooth;
3) mechanically mixing the solid lubricant with metalized surface with metal powder of a certain formula to form a working area powder 1; mechanically mixing metal powder according to a certain formula to form welding area powder 2; wherein the solid lubricant in the powder 1 is nickel-coated graphite powder, and the volume concentration is 2-6%; the metal powder in the powder 1 and the powder 2 is single FeCu30 powder;
4) corresponding to 5 parts of the pregnant and inserted tooth working area, 5 diamonds with different parameter ratios are respectively designed and arranged in different hoppers. Wherein the 1 st seed is 80-100 meshes; the 2 nd seed is 40 parts of 30-40 meshes and 60 parts of 40-50 meshes; the 3 rd seed is 40 parts of 40-50 meshes and 60 parts of 50-60 meshes; the 4 th seed is 40 parts of 60-80 meshes and 60 parts of 80-100 meshes; the 5 th seed is 80-100 meshes; wherein, the 1 st and the 2 nd diamonds are high-grade diamonds, the 3 rd diamonds are middle-grade diamonds, and the 4 th and the 5 th diamonds are low-grade diamonds;
5) in 3D printing equipment, according to the design parameters of the pregnant inlaid teeth, forming the pregnant inlaid teeth layer by layer along the axial direction of the pregnant inlaid teeth; the diamond volume concentration corresponding to 5 parts of the working area is respectively 40-60%, 25-35%, 15-20%, 5-10% and 3-6% by designing the spatial position of diamond particles in the working area.
6) Carrying out hot isostatic pressing enhancement treatment on the impregnated teeth formed by 3D printing in a protective atmosphere environment, so that the overall mechanical strength and the wear resistance of the impregnated teeth are further improved;
7) carrying out size correction on the cutting teeth subjected to the hot isostatic pressing treatment;
8) and fixing the corrected impregnated teeth on a drill bit steel body in a welding mode, thereby obtaining the impregnated diamond drill bit with the self-lubricating function and the PDC appearance.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details and embodiments shown and described herein, without departing from the general concept defined by the claims and their equivalents.
Claims (7)
1. A functionally zoned impregnated tooth, comprising: the drill bit steel body is integrally formed with a welding area and a working area, the welding area is welded on the drill bit steel body, the working area is divided into more than or equal to 2 parts along the axis of the pregnant inlaid tooth, and N is an integer.
2. The functionally-segmented pregnant insert of claim 1, wherein the welding zone is comprised of metal powder, and each portion of the working zone is comprised of metal powder, diamond of different parameters, and solid lubricant of different volume concentration.
3. The functionally-segmented pregnant insert of claim 2, wherein the working zone nth portion has a lower wear resistance than the nth-1 portion.
4. The method for preparing the pregnant insert according to the functional partition as claimed in any one of claims 1 to 3, wherein the impregnated diamond bit cutting teeth with PDC appearance and self-lubricating function are formed by cold press molding and hot press sintering, and then are subjected to hot isostatic pressing enhancement treatment and geometric dimension correction to obtain the pregnant insert according to the functional partition.
5. The method for preparing a pregnant insert according to any of claims 1 to 3, wherein the pregnant insert according to functional sub-regions is obtained by forming diamond-impregnated bit cutting teeth with PDC shape and self-lubricating function by 3D printing, and subjecting the diamond-impregnated bit cutting teeth to hot isostatic pressing enhancement and geometric dimension modification.
6. A self-lubricating impregnated diamond drill bit comprising the functionally segmented impregnated insert according to any one of claims 1 to 3.
7. The method for manufacturing a self-lubricating diamond-impregnated drill bit according to claim 6, wherein the impregnated teeth according to the functional division according to any one of claims 1 to 3 are welded to the drill bit steel body.
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| CN202110527996.1A CN113250623B (en) | 2021-05-14 | 2021-05-14 | Impregnated tooth with function zones, preparation method thereof and drill bit |
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| CN113250623B CN113250623B (en) | 2022-07-29 |
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| CN113250623B (en) | 2022-07-29 |
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