CN114109258A - Drill bit for basalt and manufacturing method thereof - Google Patents

Drill bit for basalt and manufacturing method thereof Download PDF

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Publication number
CN114109258A
CN114109258A CN202111332698.3A CN202111332698A CN114109258A CN 114109258 A CN114109258 A CN 114109258A CN 202111332698 A CN202111332698 A CN 202111332698A CN 114109258 A CN114109258 A CN 114109258A
Authority
CN
China
Prior art keywords
drill bit
wing
blade
basalt
blades
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111332698.3A
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Chinese (zh)
Inventor
李晓欢
李中勇
陈巧红
邹超
陈鹏
陈顺诚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qidong Fengsu Drilling Tool Co ltd
Original Assignee
Qidong Fengsu Drilling Tool Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qidong Fengsu Drilling Tool Co ltd filed Critical Qidong Fengsu Drilling Tool Co ltd
Priority to CN202111332698.3A priority Critical patent/CN114109258A/en
Publication of CN114109258A publication Critical patent/CN114109258A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/42Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • E21B10/43Rotary 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/46Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/60Drill bits characterised by conduits or nozzles for drilling fluids
    • E21B10/602Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/04Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042Threaded
    • E21B17/0426Threaded with a threaded cylindrical portion, e.g. for percussion rods

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  • 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 invention provides a drill bit for basalt, which comprises a first drill bit and a second drill bit, wherein the first drill bit is arranged on the second drill bit, the side wall of the second drill bit is provided with blades protruding along the radial direction, the blades are provided with cutting units for cutting broken rocks, the number of the blades is at least two, and one side of each blade is provided with a reinforcing rib. The heat dissipation of the drill bit is effectively improved, the drill bit is convenient to detach and replace, the service life of the drill bit is prolonged, the reinforcing ribs are arranged on the blades of the drill bit, the structural strength of the blades is effectively improved, meanwhile, gravel is convenient to remove, the jamming and blocking of the gravel to the tunneling of the drill bit are reduced, and the tunneling effect and efficiency are effectively improved.

Description

Drill bit for basalt and manufacturing method thereof
Technical Field
The invention relates to the technical field of drill bit processing, in particular to a drill bit for basalt and a manufacturing method thereof.
Background
Basalt is a basic extrusive rock, the chemical composition of which is similar to that of gabbro or pyroxene, and the main components of basalt are silica, alumina, iron oxide, calcium oxide, magnesium oxide (and small amounts of potassium oxide and sodium oxide), wherein the silica content is the largest, and is about forty-five to fifty percent. The mineral components mainly comprise basic feldspar and pyroxene, the secondary minerals comprise olivine, amphibole, biotite and the like, and the rocks are dark, generally black, and sometimes grayish green, dark purple and the like. Is in spot-shaped structure. Stomata configurations and almond configurations are common.
The basalt mass density is 2.8-3.3 g/cm3, the compression strength of the dense basalt is very high and can reach 300MPa, sometimes higher, and the strength is reduced when vitreous and air holes exist. Basalt has very high durability and many joints, and joint surfaces are pentagonal or hexagonal to form columnar joints. The basalt has the advantages of strong compression resistance, low crushing value, strong corrosion resistance, asphalt adhesiveness and the like, and has the advantages of wear resistance, low water consumption, poor electric conductivity, strong compression resistance, low crushing value, strong corrosion resistance, asphalt adhesiveness and the like; however, it is brittle and has high strength.
Application No. 202010677323.X discloses a PDC bit suitable for fracturing hard basalt formations. The drill comprises a tool apron and a tool blade. The upper end of the cutter holder is provided with an external thread connected with the drill collar. The bottom of blade holder is provided with a plurality of nozzles. A plurality of blades are fixed on the side surface of the tool apron. Different included angles are formed between every two adjacent cutter wings, and a chip groove is formed at the bottom end of the cutter holder. The blade has a cutting portion and a gauge portion. The cutting portion includes a cutting nose portion and a curved portion, the cutting nose portion being disposed at a bottom end of the holder. One end of the curved surface part is connected with the cutting nose part, and the other end of the curved surface part is connected with the diameter-protecting part. The curved surface part is in a multi-section ladder shape. A plurality of active cutting teeth are arranged along a first outer contour of the cutting portion. A plurality of secondary cutting teeth are distributed along the second contour of the cutting portion. Because of the structural characteristics of basalt, its structural strength is high, and the drill bit is heated seriously in the tunnelling process, causes the damage to the drill bit easily, influences the life of drill bit, consequently needs to provide a special drill bit of high strength.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the drill bit for basalt and the manufacturing method thereof, wherein the drill bit has the advantages of high tunneling speed, high structural strength, convenience in prolonging the service life of the drill bit and improving the heat dissipation effect.
The technical scheme of the invention is as follows: the drill bit for the basalt comprises a first drill bit and a second drill bit, wherein the first drill bit is installed on the second drill bit, blades protruding in the radial direction are arranged on the side wall of the second drill bit, cutting units used for cutting broken rocks are arranged on the blades, the number of the blades is at least two, and reinforcing ribs are arranged on one side of each blade.
The advantage of this scheme is, the strengthening rib can play the effect of arranging the rubble, leads to the rubble in the use, makes the rubble toward outer arranging, avoids the rubble to cause the jamming to the drill bit, improves the effect and the efficiency that the drill bit was tunneled, can also effectually improve the radiating effect of drill bit, can improve the structural strength of drill bit wing simultaneously, the effectual life who improves the drill bit.
Furthermore, the number of the blades is at least three, and reinforcing ribs are arranged between the blades. The tunneling effect of the drill bit is convenient to improve, meanwhile, the abrasion to the blades is reduced, and the width of the blades can be increased according to the use requirement, so that the diameter of the drill bit is enlarged, and the stress effect and action of the blades are improved. According to the needs of using, the strengthening rib can incline the setting, improves the discharge effect to the rubble.
Further, the reinforcing ribs are plates made of rectangular or arc-shaped hard alloy materials with heat dissipation effects. Adopt rectangle or arc, can improve strengthening rib and clastic area of contact, and then improve the effect and the efficiency of chip removal, the arc can adopt two kinds of mounting means of interior arc or outer arc, can adopt interior arc and outer arc composite mode simultaneously, makes the strengthening rib form the direction arc between the wing, reduces the rubble and persists between the wing, further improves and gets rid of effect and effect.
Further, be equipped with a plurality of through-holes on the strengthening rib, the through-hole is circular, rectangular shape or rectangle form, sets up the radiating effect and the effect that the through-hole is convenient for improve the strengthening rib, can reduce the rubble simultaneously and remain in the gap of strengthening rib and drill bit.
Further, the first drill bit is mounted on the second drill bit through threads, and the diameter of the second drill bit is at least 5mm larger than that of the first drill bit. Preferably, the diameter of the second drill bit is 1-20cm larger than the diameter of the first drill bit; more preferably, the diameter of the second drill bit is 2-5cm larger than the diameter of the first drill bit; the first drill bit is mainly used for tunneling, and the second drill bit is used for enlarging drilled holes, so that the tunneling efficiency and the drilling effect are improved, and the tunneling speed is increased.
Furthermore, the first drill bit is provided with at least three wing heads, and the wing heads incline downwards along the center of the first drill bit towards the outer side, so that the first drill bit is conical, the strength of the top end point of the drill bit is convenient to improve, the tunneling efficiency is improved, the stress on two sides of the wing heads is reduced, and the service life of the drill bit is prolonged.
Further, be equipped with arc water drainage tank between the wing head, the one end that water drainage tank is close to first drill bit center is equipped with the apopore, is convenient for improve the effect of drainage, guarantees the promotion of drainage effect, avoids blockking up, can guarantee the cooling effect to the drill bit, improves the life of drill bit.
Furthermore, at least three diamond composite sheets are arranged on the wing heads, and the diamond composite sheets on two adjacent wing heads are arranged in a staggered mode, so that the tunneling effect is improved, the drill bit is prevented from being blocked by basalt, and the overhead drill bit cannot realize tunneling.
Further, a diamond compact is attached to the outer side of the wing head. The clamping stagnation of the inner wall of the hole to the drill bit is convenient to reduce, the inner wall of the hole is polished and fastened, the hole is prevented from collapsing, the hole is enlarged, the effect and the effect of the hole can be achieved, and the pressure of the end portion of the drill bit is reduced.
A manufacturing method of a drill bit for basalt is used for manufacturing the drill bit and comprises the following steps:
processing a first drill bit, namely cutting one end of the first drill bit into a base by adopting a laser machine, welding and fixing a wing head on the base, forming a groove between the base and the wing head, arranging a water outlet in the groove, welding and fixing a diamond composite sheet on the wing head and the outer side of the wing head, and tapping an external thread on the other end of the first drill bit;
and (3) welding and fixing a blade outside the second drill bit, welding and fixing a diamond composite sheet on the blade, welding and fixing a reinforcing rib between the blade and the second drill bit or between the blade and the blade, and tapping the end part of the same end of the second drill bit and the blade to form an internal thread matched with the first drill bit.
The invention has the following characteristics: the heat dissipation of the drill bit is effectively improved, the drill bit is convenient to detach and replace, the service life of the drill bit is prolonged, the reinforcing ribs are arranged on the blades of the drill bit, the structural strength of the blades is effectively improved, meanwhile, gravel is convenient to remove, the jamming and blocking of the gravel to the tunneling of the drill bit are reduced, and the tunneling effect and efficiency are effectively improved.
The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a schematic view of a first drill bit;
FIG. 2 is a schematic view of a second drill bit;
FIG. 3 is a schematic view of another embodiment of a second drill bit;
FIG. 4-is a schematic view of the first and second drill bit installation;
1-thread, 2-first drill bit, 3-groove, 4-wing head, 5-diamond compact, 6-water outlet hole, 7-cutting knife, 8-second drill bit, 9-blade, 10-reinforcing rib and 11-through hole.
Detailed Description
As shown in the attached drawings: the utility model provides a drill bit for basalt, includes first drill bit 2 and second drill bit 8, and first drill bit 2 is installed on second drill bit 8, is equipped with along the bellied wing 9 of radial direction on the lateral wall of second drill bit 8, is provided with the cutting unit that is used for cutting broken rock on the wing 9, and the cutting unit is the diamond compact piece, and the wing 9 sets up two at least, and wing 9 one side is equipped with strengthening rib 10.
This scheme strengthening rib 10 can play the effect of arranging the rubble, leads to the rubble in the use, makes the rubble toward outer arranging, avoids the rubble to cause the jamming to the drill bit, improves the effect and the efficiency that the drill bit was tunneled, can also effectually improve the radiating effect of drill bit, can improve the structural strength of drill bit wing 9 simultaneously, the effectual life who improves the drill bit.
In the embodiment, at least three blades 9 are provided, in the embodiment, three blades 9 are provided, according to the use requirement, four or five blades 9 can be provided, and reinforcing ribs 10 are arranged between the blades 9; the tunneling effect of the drill bit is convenient to improve, meanwhile, the abrasion to the blades 9 is reduced, and the width of the blades 9 can be increased according to the use requirement, so that the diameter of the drill bit is enlarged, and the stress effect and the action of the blades 9 are improved.
In another embodiment, the reinforcing bars 10 may be inclined according to the use requirement, so as to improve the discharge effect of the crushed stones, and facilitate the guiding effect of the reinforcing bars 10 on the crushed stones.
Preferably, the reinforcing ribs 10 are rectangular or arc-shaped plates made of cemented carbide material having a heat dissipation effect. Adopt rectangle or arc, can improve strengthening rib 10 and clastic area of contact, and then improve the effect and the efficiency of chip removal, the arc can adopt two kinds of mounting means of interior arc or outer arc, can adopt interior arc and outer arc combination mode simultaneously, makes strengthening rib 10 form the direction arc between wing 9, reduces the rubble and persists between wing 9, further improves and gets rid of effect and effect.
In the embodiment, be equipped with a plurality of through-holes 11 on the strengthening rib 10, through-hole 11 is circular, rectangular shape or rectangle form, uses circular through-hole 11 on the strengthening rib 10 in this embodiment, sets up through-hole 11 and is convenient for improve the radiating effect and the effect of strengthening rib 10, can reduce the rubble simultaneously and remain in the gap of strengthening rib 10 and drill bit.
In an embodiment, the first drill bit 2 is mounted on the second drill bit 8 by means of a thread 1, the diameter of the second drill bit 8 being at least 5mm larger than the diameter of the first drill bit 2. Preferably, the diameter of the second drill 8 is 1-20cm larger than the diameter of the first drill 2; more preferably, the diameter of the second drill 8 is 2-5cm greater than the diameter of the first drill 2; the first drill bit 2 is mainly used for tunneling, and the second drill bit 8 is used for enlarging drilling, so that the tunneling efficiency and the drilling effect are improved, and the tunneling speed is increased.
In the embodiment, at least three wing heads 4 are arranged on the first drill 2, in the embodiment, three wing heads 4 are arranged, and four or five wing heads can be arranged according to the use requirement; the wing head 4 inclines downwards along the center of the first drill bit 2 towards the outer side, so that the first drill bit 2 is conical, the strength of the top end point of the drill bit is convenient to improve, the tunneling efficiency is improved, the stress on the two sides of the wing head 4 is reduced, and the service life of the drill bit is prolonged. Preferably, the center of the first drill bit 2 is provided with a cutting blade 7 of the diamond compact 5 through a support, so that the tunneling speed and the gravel removal effect can be improved.
In the embodiment, be equipped with arc water drainage tank between the winged head 4, water drainage tank is close to the one end at 2 centers of first drill bits and is equipped with apopore 6, is convenient for improve the effect of drainage, guarantees the promotion of drainage effect, avoids blockking up, can guarantee the cooling effect to the drill bit, improves the life of drill bit. Preferably, at least three diamond composite sheets 5 are arranged on the wing heads 4, four diamond composite sheets 5 are arranged in the embodiment, and the diamond composite sheets 5 on two adjacent wing heads 4 are arranged in a staggered mode, so that the tunneling effect is improved, the drill bit is prevented from being blocked by basalt, and the overhead drill bit cannot realize tunneling.
In the embodiment, diamond compacts 5 are attached to the outer sides of the wing heads 4. The clamping stagnation of the inner wall of the hole to the drill bit is convenient to reduce, the inner wall of the hole is polished and fastened, the hole is prevented from collapsing, the hole is enlarged, the effect and the effect of the hole can be achieved, and the pressure of the end portion of the drill bit is reduced.
The manufacturing method of the drill bit for basalt comprises the following steps: processing a first drill bit 2, namely cutting one end of the first drill bit 2 into a base by adopting a laser machine, welding and fixing a wing head 4 on the base, forming a groove 3 between the base and the wing head 4, arranging a water outlet in the groove 3, welding and fixing a diamond composite sheet 5 on the wing head 4 and the outer side of the wing head 4, and tapping an external thread 1 on the other end of the first drill bit 2;
the processing of second drill bit 8, at the outside welded fastening wing 9 of second drill bit 8, welded fastening diamond compact 5 on the wing 9, welded fastening strengthening rib 10 between wing 9 and second drill bit 8, or wing 9 and the wing 9, the internal thread 1 that the end tapping of the same end of second drill bit 8 and wing 9 matches with first drill bit 2.
The invention effectively improves the heat dissipation of the drill bit, is convenient to disassemble and replace the drill bit, prolongs the service life of the drill bit, effectively improves the structural strength of the blade 9 by arranging the reinforcing ribs 10 on the blade 9 of the drill bit, is convenient to remove broken stones, reduces the clamping stagnation and obstruction of the broken stones to the tunneling of the drill bit, and effectively improves the tunneling effect and efficiency.
The above is the preferred embodiment of the present invention and the technical principle applied thereto, and it is obvious for those skilled in the art that any equivalent changes, simple substitutions and other obvious changes based on the technical solution of the present invention are within the protection scope of the present invention without departing from the spirit and scope of the present invention.

Claims (10)

1. The utility model provides a drill bit for basalt, includes first drill bit and second drill bit, and first drill bit is installed on the second drill bit, its characterized in that: the side wall of the second drill bit is provided with blades protruding along the radial direction, the blades are provided with cutting units for cutting broken rocks, the number of the blades is at least two, and one side of each blade is provided with a reinforcing rib.
2. The drill bit for basalt according to claim 1, characterized in that: the blade sets up at least threely, is equipped with the strengthening rib between the blade.
3. The drill bit for basalt according to claim 2, characterized in that: the reinforcing ribs are rectangular or arc plates made of hard alloy materials with heat dissipation effects.
4. The drill bit for basalt according to claim 3, characterized in that: the reinforcing ribs are provided with a plurality of through holes which are round, long-strip-shaped or rectangular.
5. A drill bit for basalt according to any one of claims 1 to 4, wherein: the first drill bit is installed on the second drill bit through threads, and the diameter of the second drill bit is at least 5mm larger than that of the first drill bit.
6. The drill bit for basalt according to claim 5, characterized in that: the first drill bit is provided with at least three wing heads, and the wing heads incline downwards along the center of the first drill bit towards the outer side, so that the first drill bit is conical.
7. The drill bit for basalt according to claim 6, wherein: an arc-shaped water drainage groove is arranged between the wing heads, and a water outlet hole is formed in one end, close to the center of the first drill bit, of the water drainage groove.
8. The drill bit for basalt according to claim 7, wherein: at least three diamond composite sheets are arranged on the wing heads, and the diamond composite sheets on the two adjacent wing heads are arranged in a staggered mode.
9. The drill bit for basalt according to claim 8, wherein: and the diamond compact is attached to the outer side of the wing head.
10. A method of manufacturing a drill for basalt, for manufacturing a drill according to any one of claims 1 to 9, comprising the steps of:
processing a first drill bit, namely cutting one end of the first drill bit into a base by adopting a laser machine, welding and fixing a wing head on the base, forming a groove between the base and the wing head, arranging a water outlet in the groove, welding and fixing a diamond composite sheet on the wing head and the outer side of the wing head, and tapping an external thread on the other end of the first drill bit;
and (3) welding and fixing a blade outside the second drill bit, welding and fixing a diamond composite sheet on the blade, welding and fixing a reinforcing rib between the blade and the second drill bit or between the blade and the blade, and tapping the end part of the same end of the second drill bit and the blade to form an internal thread matched with the first drill bit.
CN202111332698.3A 2021-11-11 2021-11-11 Drill bit for basalt and manufacturing method thereof Pending CN114109258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111332698.3A CN114109258A (en) 2021-11-11 2021-11-11 Drill bit for basalt and manufacturing method thereof

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Application Number Priority Date Filing Date Title
CN202111332698.3A CN114109258A (en) 2021-11-11 2021-11-11 Drill bit for basalt and manufacturing method thereof

Publications (1)

Publication Number Publication Date
CN114109258A true CN114109258A (en) 2022-03-01

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CN202111332698.3A Pending CN114109258A (en) 2021-11-11 2021-11-11 Drill bit for basalt and manufacturing method thereof

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1270868A1 (en) * 1999-10-28 2003-01-02 Camco International (UK) Limited A bi-centre bit for drilling out through a casing shoe
CN202706927U (en) * 2012-07-25 2013-01-30 贾鑫玉 Improved structure for polycrystalline diamond compact (PDC) bit
CN104551126A (en) * 2014-12-22 2015-04-29 苏州欧美克合金工具有限公司 Hard-alloy internal-cooled drill bit
CN105422006A (en) * 2015-12-08 2016-03-23 西南石油大学 Adjustable underground rock breaking tool combining drilling and expanding
CN210164477U (en) * 2019-04-30 2020-03-20 河南四方达超硬材料股份有限公司 Novel polycrystalline diamond cutting tooth
CN111764832A (en) * 2020-07-14 2020-10-13 江苏煤炭地质勘探三队 PDC drill bit suitable for crushing hard basalt stratum
CN112983282A (en) * 2021-03-05 2021-06-18 常州工学院 Three-section guiding double-cone six-wing large-diameter reaming bit and construction method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1270868A1 (en) * 1999-10-28 2003-01-02 Camco International (UK) Limited A bi-centre bit for drilling out through a casing shoe
CN202706927U (en) * 2012-07-25 2013-01-30 贾鑫玉 Improved structure for polycrystalline diamond compact (PDC) bit
CN104551126A (en) * 2014-12-22 2015-04-29 苏州欧美克合金工具有限公司 Hard-alloy internal-cooled drill bit
CN105422006A (en) * 2015-12-08 2016-03-23 西南石油大学 Adjustable underground rock breaking tool combining drilling and expanding
CN210164477U (en) * 2019-04-30 2020-03-20 河南四方达超硬材料股份有限公司 Novel polycrystalline diamond cutting tooth
CN111764832A (en) * 2020-07-14 2020-10-13 江苏煤炭地质勘探三队 PDC drill bit suitable for crushing hard basalt stratum
CN112983282A (en) * 2021-03-05 2021-06-18 常州工学院 Three-section guiding double-cone six-wing large-diameter reaming bit and construction method thereof

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Application publication date: 20220301

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