CN108104722B - Third-order drill bit and manufacturing method thereof - Google Patents
Third-order drill bit and manufacturing method thereof Download PDFInfo
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- CN108104722B CN108104722B CN201810091255.1A CN201810091255A CN108104722B CN 108104722 B CN108104722 B CN 108104722B CN 201810091255 A CN201810091255 A CN 201810091255A CN 108104722 B CN108104722 B CN 108104722B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 230000036346 tooth eruption Effects 0.000 claims abstract description 13
- 238000005245 sintering Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims description 52
- 229910003460 diamond Inorganic materials 0.000 claims description 34
- 239000010432 diamond Substances 0.000 claims description 34
- 238000003825 pressing Methods 0.000 claims description 29
- 238000005520 cutting process Methods 0.000 claims description 17
- 239000011159 matrix material Substances 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
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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
-
- 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
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- 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
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
-
- 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
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The application relates to a third-order drill bit suitable for mudstone core drilling and a manufacturing method thereof. The third-order drill bit and the manufacturing method thereof have the characteristics of good guidance, strong anti-sticking capability and high drilling efficiency, the manufacturing process does not need to sinter the third-order step cutting teeth respectively and machine processing and re-sintering, only one-step sintering is needed, the working procedure is simple and efficient, and the produced drill bit has high concentricity, good wear resistance and low cost.
Description
Technical Field
The application belongs to the technical field of stratum drilling, and particularly relates to a third-order drill bit suitable for viscous stratum core drilling and a manufacturing method thereof.
Background
Some stratum geology condition is complicated, contains many mud rocks that plasticity is strong, for example the coal seam, and earth glues on the drill bit easily in the drilling process, can all bring very big trouble for the drilling construction, and the drill bit takes place eccentric problem easily at the in-process of boring simultaneously, leads to boring direction wandering away. In the prior art, a third-order drill bit with difficult deviation of drilling direction and good mud discharging effect and a manufacturing method thereof are urgently needed.
Disclosure of Invention
The application aims to overcome the defects in the prior art and provide a third-order drill bit with difficult deviation of drilling direction and good mud discharging effect and a manufacturing method thereof.
In order to achieve the purpose, the technical scheme of the application provides a third-order drill bit, which comprises an outer pipe connecting sleeve and an annular drill bit which are sequentially arranged from inside to outside, wherein the outer pipe connecting sleeve is connected with the drill bit through a transition bonding pipe; the drill bit comprises a third-order drill bit, a second-order drill bit and a first-order drill bit, the outer diameters of which are sequentially reduced from inside to outside, the third-order drill bit, the second-order drill bit and the first-order drill bit are connected into a concentric step cylinder, cutting teeth of the third-order drill bit, the second-order drill bit and the first-order drill bit are single-sided helical teeth, and the surfaces of the single-sided helical teeth comprise a cutting plane of a tooth end and a tooth inclined plane which is inclined downwards to the tooth root along one side of the cutting plane; the cutting teeth are uniformly distributed around the axis of the cylinder;
and a main waterway is arranged among the cutting teeth of the third-order drill bit, the second-order drill bit and the first-order drill bit.
Through the design, in the drilling process of the drill bit, the step structures of the third-order drill bit, the second-order drill bit and the first-order drill bit can play a role in better guidance and are not easy to eccentric; the design of comparatively big main water route and bath hole can in time cool off and lubricate the drill bit, reduces and prevents to glue and bore the risk.
Preferably, the main waterway extends from the third-order drill bit to the first-order drill bit and is communicated with the inner wall of the first-order drill bit. The designed water flow can be directly discharged from the inside of the drill bit to the outside of the drill bit through the main water channel, so that the drill bit is cooled and the lip surface of the drill bit is lubricated.
Preferably, the step surfaces of the main waterways of the third-order drill bit and the second-order drill bit are also provided with inner drain holes, and the inner parts of the inner drain holes are communicated with the inner wall of the third-order drill bit. By means of the design, water flow can be directly discharged out of the drill bit through the inner water discharge hole (converged with water flow from the main waterway) from the inside of the drill bit, and the cutting plane is fully washed under the guiding effect of the tooth inclined plane, so that the mud discharging effect is further improved.
Preferably, the cutting tooth comprises a tooth end portion near the cutting plane and a tooth base supporting the tooth end portion, and the tooth end portion and the tooth base are integrally sintered and formed. By dividing the cutting tooth into the tooth end and the tooth base, different materials can be sintered during sintering, a matrix with high wear resistance is used for the tooth end which is cut with geology, the content of diamond large particles is reduced for the tooth base, and the cost can be controlled.
The manufacturing method of the third-order drill bit comprises the following steps:
the first step: mixing matrix materials: mixing metal powder and diamond powder according to a certain proportion to obtain filling powder of a matrix;
and a second step of: laying a first-stage drill bit layer: uniformly paving the filling powder a in a mould, wherein the thickness of the filling powder a reaches 1/5 of the height of the first-stage drill bit, and pre-pressing the first-stage drill bit layer to obtain pre-pressing pressure of 20/3Mpa; uniformly paving the filling powder b in a mould, wherein the thickness of the filling powder b reaches the height of the first-stage drill bit, and pre-pressing the first-stage drill bit layer to obtain pre-pressing pressure of 20/3Mpa;
and a third step of: laying a second-order drill bit layer: the step is the same as the paving step of the second step;
fourth step: paving a third-order drill bit layer: the step is the same as the paving step of the second step;
fifth step: paving a transitional bonding pipe layer and placing an outer pipe connecting sleeve: and (3) continuously and uniformly paving the filling powder c of the transition bonding pipe layer in the die, and positioning and placing the outer pipe connecting sleeve on the transition bonding pipe layer.
Fifth step: applying a pre-pressing pressure: applying 10-20 KN to the outer pipe connecting sleeve;
sixth step: and (3) heat preservation and diffusion: heating from room temperature at the speed of 250-300 ℃/min to 850-900 ℃; preserving heat for 1-5 minutes, and applying pressure of 10Mpa;
seventh step: and (3) pressurized sintering: rapidly heating to 970 ℃, applying pressure of 20Mpa, and cooling in the die after maintaining the pressure for 1-5 minutes;
eighth step: and (5) removing the workpiece: cooling to about 650 ℃, taking out the workpiece die, and cooling at room temperature;
ninth step: and processing an inner flushing hole.
Through the thermal insulation diffusion process design, each layer of the filling powder is pre-pressed in the process of uniformly paving the filling powder, so that the density and the bonding strength of a matrix can be improved, and the defect of insufficient pressure conduction caused by the increase of the height of a die is overcome; meanwhile, the conventional large drill bit can be sintered again through sintering and machining, and the machining is complicated.
Preferably, in the second step, the filling powder a is WC40%, YG615%, ni5%, mn5%, cu66335%, 10% of diamond powder 35-40 mesh, 35% of diamond 40-45 mesh, 35% of diamond 45-50 mesh, 20% of diamond 50-60 mesh;
the filling powder b is WC30%, YG625%, ni5%, mn5%, cu66335%, diamond powder 35-40 mesh 10%, diamond 40-45 mesh 40%, diamond 45-50 mesh 40%, diamond 50-60 mesh 10%, and the diamond concentration of matrix is 90% (third-stage drill bit to first-stage drill bit overall).
By such design, powder with high WC content and 50-60 meshes of diamond is filled in the tooth tip layer, powder with lower WC content and less diamond with 50-60 meshes is filled in the tooth root, and the manufacturing cost can be reduced while the wear resistance is ensured.
Preferably, in the second step, the filling powder c has a mass fraction formula of: 30% of WC, 25% of Fe, 5% of Ni, 5% of Mn and 66335% of Cu. The formula with the proportion can play a good role in connection and support.
Preferably, the die in the second step is a compact graphite die. The design of the sample is a further optimization of the protocol.
The application has the advantages and beneficial effects that: through the design, in the drilling process of the drill bit, the step structures of the third-order drill bit, the second-order drill bit and the first-order drill bit can play a role in better guidance and are not easy to eccentric; the design of comparatively big main water route and bath hole can in time cool off and lubricate the drill bit, reduces and prevents to glue and bore the risk.
Drawings
FIG. 1 is a schematic view of a third-order drill bit according to the present application;
FIG. 2 is an enlarged schematic view of the structure A in FIG. 1;
FIG. 3 is a side view of a third order drill bit;
FIG. 4 is a top view of a third order drill bit;
fig. 5 is a schematic of the laying process of the filling powder in the example.
In the figure: 1. an outer pipe connecting sleeve; 2. a drill bit; 3. a transitional bonding pipe; 4. a first order drill bit; 5. a third order drill bit; 6. cutting teeth; 7. a main waterway; 8. a second-order drill bit; 9. cutting a plane; 10. tooth inclined planes; 11. an inner drain hole; 12. a tooth end; 13. a tooth base; 14. an outer housing; 15. a cavity; 16. a core rod; 17. a concave table; 18. filling powder a; 19. filling powder b; 20. filling powder c.
Detailed Description
The following describes the embodiments of the present application further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
As shown in fig. 1 and 5, a third-order drill bit is characterized in that: the device comprises an outer pipe connecting sleeve 1 and an annular drill bit 2 which are sequentially arranged from inside to outside, wherein the outer pipe connecting sleeve 1 is connected with the drill bit 2 through a transition bonding pipe 3; the drill bit 2 comprises a third-order drill bit 5, a second-order drill bit 8 and a first-order drill bit 4, the outer diameters of which are sequentially reduced from inside to outside, the third-order drill bit 5, the second-order drill bit 8 and the first-order drill bit 4 are connected into concentric stepped cylinders, cutting teeth 6 of the third-order drill bit 5, the second-order drill bit 8 and the first-order drill bit 4 are single-sided helical teeth, and the surfaces of the single-sided helical teeth comprise a cutting plane 9 at a tooth end and a tooth inclined plane 10 which is inclined downwards to a tooth root along one side of the cutting plane 9; the cutting teeth 6 are uniformly distributed around the axis of the cylinder;
a main waterway 7 is arranged among the third-order drill bit 5, the second-order drill bit 8 and the cutting teeth 6 of the first-order drill bit 4.
The main waterway 7 extends from the third-stage drill bit 5 to the first-stage drill bit 4 and is communicated with the inner wall of the first-stage drill bit 4.
The step surfaces of the main waterways 7 of the third-order drill bit 5 and the second-order drill bit 8 are also provided with inner drain holes 11, and the inner parts of the inner drain holes 11 are communicated with the inner wall of the third-order drill bit 5.
The cutting tooth 6 comprises a tooth end 12 adjacent to the cutting plane 9 and a tooth base 13 supporting the tooth end 12, the tooth end 12 and the tooth base 13 being integrally sinter molded.
In the manufacturing process, the die comprises an outer shell 14, a cavity 15 is formed in the outer shell 14, a core rod 16 is arranged in the middle of the cavity 15, an annular cavity 15 between the core rod 16 and the inner wall of the cavity 15 is a filling space, the core rods 16 can be arranged in a segmented mode, and the core rods 16 in different segments are connected through threads; the step-shaped drill bit 2 can be obtained by processing according to the steps one to nine, the cutting teeth 6 of the drill bit 2 and the structure of the main waterway 7 are formed by the inner structure of a die, and the inner drain hole 11 is punched by the mechanical drill bit 2 after sintering.
The manufactured drill bit 2 is a coaxial stepped drill bit 2, and in the drilling process of the drill bit 2, the stepped structures of the third-order drill bit 5, the second-order drill bit 8 and the first-order drill bit 4 can play a role in better guidance and are not easy to eccentric; after the first-stage drill bit 4 has drilled into the geological layer, the second-stage drill bit 8 then drills into the geological layer, and the side wall of the first-stage drill bit 4 is tightly contacted with the geological layer to limit the swing of the drill bit 2, so that the two-stage drill bit 2 has stronger isotropy when drilling simultaneously; the first two steps may function similarly after the third step has been drilled into the geological formation.
The main waterway 7 is widened by combining the main waterway 7 and the inner drain holes 11 in the waterway, meanwhile, the step surfaces of the main waterways 7 of the third-stage drill bit 5 and the second-stage drill bit 8 are also provided with the inner drain holes 11, most of water flow is directly discharged to the outside of the drill bit 2 from the inside of the drill bit 2 through the main waterway 7, and part of water flow is discharged to the concave table 17 through the inner drain holes 11, and then the cutting plane 9 is fully washed under the guiding action of the tooth inclined plane 10, so that the mud discharging effect is further improved; because the width of the tooth inclined plane 10 is four to five times that of the cutting plane 9, the water flow guiding function can be well achieved, and the cutting plane 9 is prevented from sticking to the drill.
The first step: mixing matrix materials: mixing metal powder and diamond powder according to a certain proportion to obtain filling powder of a matrix;
and a second step of: laying a first-stage drill bit 4 layers: uniformly paving the filling powder a18 in a mould, wherein the thickness reaches 1/5 of the height of the first-stage drill bit 4, and pre-pressing the first-stage drill bit 4 layer, wherein the pre-pressing pressure is 20/3Mpa; uniformly paving the filling powder b19 in a mould, wherein the thickness reaches the height of the first-stage drill bit 4, and pre-pressing the first-stage drill bit 4 layer, wherein the pre-pressing pressure is 20/3Mpa;
and a third step of: laying a second-stage drill bit 8 layers: the step is the same as the paving step of the second step;
uniformly paving the filling powder a18 in a mould, wherein the thickness reaches 1/5 of the height of the second-stage drill bit 8, and pre-pressing the second-stage drill bit 8 layer, wherein the pre-pressing pressure is 20/3Mpa; uniformly paving the filling powder b19 in a mould, wherein the thickness of the filling powder b19 reaches the height of the second-stage drill bit 8, and pre-pressing the second-stage drill bit 8 layer, wherein the pre-pressing pressure is 20/3Mpa;
fourth step: laying a third-order drill bit 5 layers: the step is the same as the paving step of the second step;
uniformly paving the filling powder a18 in a mould, wherein the thickness reaches 1/5 of the height of the third-order drill bit 5, and pre-pressing the third-order drill bit 5 layer, wherein the pre-pressing pressure is 20/3Mpa; uniformly paving the filling powder b19 in a mould, wherein the thickness reaches the height of the third-order drill bit 5, and pre-pressing the third-order drill bit 5 layer, wherein the pre-pressing pressure is 20/3Mpa;
fifth step: laying a transitional bonding pipe 3 layer and placing an outer pipe connecting sleeve 1: the filling powder c20 of the transition bonding pipe 3 layer is continuously and evenly paved in the die, and the outer pipe connecting sleeve 1 is positioned and placed on the transition bonding pipe 3 layer.
Fifth step: applying a pre-pressing pressure: applying 10-20 KN to the outer pipe connecting sleeve 1;
sixth step: and (3) heat preservation and diffusion: heating from room temperature at the speed of 250-300 ℃/min to 850-900 ℃; preserving heat for 1-5 minutes, and applying pressure of 10Mpa; the temperature is kept at 850 ℃ for 3 minutes, so that the fluidity of Cu663 (bronze powder 663) can be ensured under lower temperature and pressure, and the final matrix binding force is ensured;
seventh step: and (3) pressurized sintering: rapidly heating to 970 ℃, applying pressure of 20Mpa, and cooling in the die after maintaining the pressure for 1-5 minutes; the high temperature and high pressure can ensure the final forming tightness of the matrix in a short time, so that the wear resistance of the drill bit 22 is improved and the service life of the drill bit is prolonged;
eighth step: and (5) removing the workpiece: cooling to about 650 ℃, taking out the workpiece die, and cooling at room temperature;
ninth step: and processing an inner flushing hole.
In the second step, filling powder a18 is WC40%, YG615%, ni5%, mn5%, cu66335%, diamond powder 35-40 mesh 10%, diamond 40-45 mesh 35%, diamond 45-50 mesh 35% and diamond 50-60 mesh 20%;
the filling powder b19 comprises 30% of WC, 625% of YG, 5% of Ni, 5% of Mn, 35-40 meshes of Cu66335, 10% of diamond powder, 40-45 meshes of diamond, 45-50 meshes of diamond, 10% of diamond 50-60 meshes, and 90% of diamond concentration of a matrix. The tooth tip layer is filled with powder with high WC content and 50-60 meshes, and the tooth root is filled with powder with lower WC content and less diamond with 50-60 meshes, so that the manufacturing cost can be reduced while the wear resistance is ensured.
In the second step, the filling powder c20 has the following formula in percentage by mass: 30% of WC, 25% of Fe, 5% of Ni, 5% of Mn and 66335% of Cu.
And the die in the second step is a compact graphite die.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.
Claims (1)
1. A third order drill bit, characterized in that: the device comprises an outer pipe connecting sleeve and an annular drill bit which are sequentially arranged from inside to outside, wherein the outer pipe connecting sleeve is connected with the drill bit through a transition bonding pipe; the drill bit comprises a third-order drill bit, a second-order drill bit and a first-order drill bit, the outer diameters of which are sequentially reduced from inside to outside, the third-order drill bit, the second-order drill bit and the first-order drill bit are connected into a concentric step cylinder, cutting teeth of the third-order drill bit, the second-order drill bit and the first-order drill bit are single-sided helical teeth, and the surfaces of the single-sided helical teeth comprise a cutting plane of a tooth end and a tooth inclined plane which is inclined downwards to the tooth root along one side of the cutting plane; the cutting teeth are uniformly distributed around the axis of the cylinder;
a main waterway is arranged among the third-order drill bit, the second-order drill bit and the cutting teeth of the first-order drill bit;
the main waterway extends from the third-order drill bit to the first-order drill bit and is communicated with the inner wall of the first-order drill bit;
the step surfaces of the main waterways of the third-order drill bit and the second-order drill bit are also provided with inner drain holes, and the inner parts of the inner drain holes are communicated with the inner wall of the third-order drill bit;
the cutting teeth comprise tooth end parts close to a cutting plane and tooth bases for supporting the tooth end parts, and the tooth end parts and the tooth bases are integrally sintered and formed;
the manufacturing method of the third-order drill bit comprises the following steps:
the first step: mixing matrix materials: mixing metal powder and diamond powder according to a certain proportion to obtain filling powder of a matrix;
and a second step of: laying a first-stage drill bit layer: uniformly paving the filling powder a in a mould, wherein the thickness of the filling powder a reaches 1/5 of the height of the first-stage drill bit, and pre-pressing the first-stage drill bit layer to obtain pre-pressing pressure of 20/3Mpa; uniformly paving the filling powder b in a mould, wherein the thickness of the filling powder b reaches the height of the first-stage drill bit, and pre-pressing the first-stage drill bit layer to obtain pre-pressing pressure of 20/3Mpa;
and a third step of: laying a second-order drill bit layer: the step is the same as the paving step of the second step;
fourth step: paving a third-order drill bit layer: the step is the same as the paving step of the second step;
fifth step: paving a transitional bonding pipe layer and placing an outer pipe connecting sleeve: continuously and uniformly paving the filling powder c of the transition bonding pipe layer in the mould, and positioning and placing the outer pipe connecting sleeve on the transition bonding pipe layer; applying a pre-pressing pressure: applying 10-20 KN to the outer pipe connecting sleeve;
sixth step: and (3) heat preservation and diffusion: heating from room temperature at a speed of 250-300 ℃/min to 850-900 ℃; preserving heat for 1-5 minutes, and applying pressure of 10Mpa;
seventh step: and (3) pressurized sintering: rapidly heating to 970 ℃, applying pressure of 20Mpa, and cooling in the die after maintaining the pressure for 1-5 minutes;
eighth step: and (5) removing the workpiece: cooling to about 650 ℃, taking out the workpiece die, and cooling at room temperature;
ninth step: processing an inner flushing hole;
in the second step, filling powder a is WC40%, YG615%, ni5%, mn5%, cu 663%, diamond powder 35-40% 10%, diamond 40-45% 35%, diamond 45-50% 35% and diamond 50-60% 20%;
the filling powder b is composed of 30% of WC, 6% of YG, 25% of Ni, 5% of Mn, 5% of Cu663, 10% of diamond powder 35-40%, 40% of diamond 40-45%, 40% of diamond 45-50%, 10% of diamond 50-60% and 90% of diamond concentration of the matrix;
in the second step, the mass fraction formula of the filling powder c is as follows: 30% of WC, 25% of Fe, 5% of Ni, 5% of Mn and 663% of Cu;
and the die in the second step is a compact graphite die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810091255.1A CN108104722B (en) | 2018-01-30 | 2018-01-30 | Third-order drill bit and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810091255.1A CN108104722B (en) | 2018-01-30 | 2018-01-30 | Third-order drill bit and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108104722A CN108104722A (en) | 2018-06-01 |
| CN108104722B true CN108104722B (en) | 2023-08-29 |
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| CN201810091255.1A Active CN108104722B (en) | 2018-01-30 | 2018-01-30 | Third-order drill bit and manufacturing method thereof |
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| CN112302541B (en) * | 2020-10-29 | 2023-03-24 | 长江大学 | A matrix PDC coring bit that is arranged in hard and above homogeneity stratum |
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