WO2008120937A1 - Sintered body for excavating tool - Google Patents

Sintered body for excavating tool Download PDF

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Publication number
WO2008120937A1
WO2008120937A1 PCT/KR2008/001794 KR2008001794W WO2008120937A1 WO 2008120937 A1 WO2008120937 A1 WO 2008120937A1 KR 2008001794 W KR2008001794 W KR 2008001794W WO 2008120937 A1 WO2008120937 A1 WO 2008120937A1
Authority
WO
WIPO (PCT)
Prior art keywords
supporting units
sintered body
superhard
excavation tool
substrate
Prior art date
Application number
PCT/KR2008/001794
Other languages
French (fr)
Inventor
Jeang-Uok Oh
Byong-Joon Park
Original Assignee
Iljin Diamond 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 Iljin Diamond Co., Ltd. filed Critical Iljin Diamond Co., Ltd.
Publication of WO2008120937A1 publication Critical patent/WO2008120937A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2204/00—End product comprising different layers, coatings or parts of cermet

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Earth Drilling (AREA)

Abstract

Provided is a sintered body for an excavation tool. The sintered body for an excavation tool includes a substrate having a pillar-form body, a plurality of supporting units extended from the body in a length direction of the body and arranged to be spaced apart from each other in a circumference direction of the body, and an accommodation region formed in the body and the supporting units; and a superhard layer combined with the substrate, the superhard layer being formed by charging superhard materials, in a powder form and having the hardness that is higher than that of the substrate, in the accommodation region, and by sintering the charged superhard materials under high temperature and high pressure. The superhard layer has a plurality of cutting edges and thus a cutting performance of the sintered body for an excavation tool significantly improves.

Description

SINTERED BODY FOR EXCAVATING TOOL
TECHNICAL FIELD
The present invention relates to a sintered body for an excavation tool, and more particularly, to a sintered body for an excavation tool having an improved structure capable of improving an excavation performance for excavating a subterranean base rock, wherein the sintered body for an excavation tool being rotatably combined with a tool assembly as a single body.
BACKGROUND ART
In general, a sintered body for an excavation tool is combined with a tool assembly that is used in excavating for oil in an oil well, so as to cut a subterranean base rock, thereby being used for an excavation work. The technology for an excavation tool using such a sintered body for an excavation tool is disclosed in US 2002/0144843 and US 2004/0206552. The excavation tool disclosed in these publications employs a plurality of diamond-sintered bodies.
Meanwhile, prior arts relating to the sintered body for an excavation tool and filed prior to the filing of these publications above are disclosed in US 4,604,106 and International Publication WO2004040096. In these publications, a sintered body for an excavation tool, wherein the sintered body has the structure in which polycrystailine diamond is combined onto a tungsten carbide (WC-Co) substrate, that is manufactured using cobalt as a bonding agent, by sintering, is disclosed.
FIG. 1 is a perspective view schematically illustrating a conventional sintered body 1 for an excavation tool. The conventional sintered body 1 illustrated in FIG. 1 is disclosed in International Publication WO2004/040096. FIG. 2 is a sectional view of the conventional sintered body 1 of FIG. 1 , taken along line N - I l of FIG. 1. Referring to FIGS. 1 and 2, the conventional sintered body 1 has a structure in which a cylinder-shaped substrate 2 formed of a tungsten cobalt alloy and a superhard layer 3 are combined with each other as a single body, after stacking the superhard layer 3 formed of diamond onto a part of the substrate 2 in a powder form and sintering the stacked superhard layer 3 in a sintering furnace under high temperature and high pressure. In order to increase the bonding force between the substrate 2 and the superhard layer 3, a boundary surface of the substrate 2 and the superhard layer 3 roughens in the conventional sintered body 1 , thereby increasing a contact surface. As a result, the bonding force between the substrate 2 and the superhard layer 3 increases.
Meanwhile, when excavating for oil in an oil well, an outer peripheral surface of the superhard layer 3 rotates and contacts with a base rock and then the conventional sintered body 1 cuts a part of the base rock. In this case, a part of the conventional sintered body 1 that rotated while contacting the base rock is referred to as a cutting edge 5. In such conventional sintered body 1 , the circumference of the superhard layer 3 is a round form. Accordingly, only one cutting edge 5 is formed and a process of cutting the base rock is performed around the cutting edge 5. In order to improve a cutting performance, the number of rotations of the tool assembly may increase. However, in this case, an excessive load may impose on the conventional sintered body 1 and thus the conventional sintered body 1 may be damaged. Therefore, there is a need to maintain the number of rotations of the tool assembly constant as in the conventional sintered body 1 and to improve a cutting performance.
DETAILED DESCRIPTION OF THE INVENTION
TECHNICAL PROBLEM
The present invention provides a sintered body for an excavation tool, the sintered body having an improved structure capable of improving a cutting performance along with improving a bonding force between a substrate and a superhard layer by forming a plurality of cutting edges contacting with a base rock during the excavating for oil in an oil well.
TECHNICAL SOLUTION
According to an aspect of the present invention, there is provided a sintered body for an excavation tool including: a substrate having a pillar-form body, a plurality of supporting units extended from the body in a length direction of the body and arranged to be spaced apart from each other in a circumference direction of the body, and an accommodation region formed in the body and the supporting units; and a superhard layer combined with the substrate, the superhard layer being formed by charging superhard materials, in a powder form and having a hardness that is higher than that of the substrate, in the accommodation region, and by sintering the charged superhard materials under high temperature and high pressure.
According to an aspect of the present invention, there is provided a sintered body for an excavation tool including: a substrate formed of an alloy of tungsten and cobalt and having a cylinder-form body, a plurality of supporting units extended from the body in a length direction of the body and arranged to be spaced apart from each other in a circumference direction of the body, and an accommodation region formed in the body and the supporting units; and a superhard layer combined with the substrate, wherein the superhard layer being formed by charging superhard materials, in a powder form and having the hardness that is higher than that of the substrate, in the accommodation region, and by sintering the charged superhard materials under high temperature and high pressure, and the edges of the superhard layer that are adjacent to the supporting units form a plurality of cutting edges.
The superhard layer may be formed of at least one of diamond and Cubic Boron Nitride (CBN).
The supporting units may be arranged along the circumference of the body.
Interfaces between the supporting units and the superhard layer may be formed to cross the length direction of the body.
Interfaces between the supporting units and the superhard layer may be formed to be parallel to the length direction of the body.
The supporting units may be arranged to be spaced apart from each other in regular intervals.
When the body has a diameter of 10 mm or less, the number of the supporting units may be 2 through 10.
When the body has a diameter of 10 mm or above and 20 mm or less, the number of the supporting units may be 2 through 30.
When the body has a diameter of 20 mm or above and 100 mm or less, the number of the supporting units may be 2 through 100.
ADVANTAGEOUS EFFECTS
As described above, a bonded surface between a substrate and a superhard layer increases, compared with that of the conventional sintered body for an excavation tool, due to an interface between supporting units and the superhard layer, in a sintered body for an excavation tool according to the present invention, and thus, the superhard layer is bonded more firmly to the substrate. In addition, when the supporting units are worn away, the circumference of the superhard layer, in a toothed wheel form, rotates and contacts with the base rock. Thus, a plurality of the cutting edge of the superhard layer having a hardness that is higher than that of the base rock is formed. Accordingly, a performance of cutting and excavating the base rock using the sintered body for an excavation tool according to the present invention significantly increases, compared with that of the conventional sintered body for an excavation tool.
According to the present invention, the sintered body for an excavation tool capable of maintaining the number of rotations to be the same with those of the conventional sintered body for an excavation tool and significantly increasing a performance of excavating the base rock can be provided.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view schematically illustrating a conventional sintered body for an excavation tool;
FIG. 2 is a sectional view of the conventional sintered body of FIG. 1 , taken along line M - I l of FIG. 1.
FIG. 3 is a perspective view schematically illustrating a sintered body for an excavation tool, according to an embodiment of the present invention;
FIG. 4 is a plan view of the sintered body of FIG. 3, according to an embodiment of the present invention;
FIG. 5 is a side view of the sintered body of FIG. 3, according to an embodiment of the present invention;
FIG. 6 is a sectional view of the sintered body of FIG. 3, taken along line Vl-Vl of FIG. 1 ;
FIG. 7 shows a substrate from which a superhard layer is removed from the sintered body of FIG. 3, according to an embodiment of the present invention;
FIG. 8 is a diagram for explaining a condition of use of the sintered body of FIG. 3, according to an embodiment of the present invention; and
FIG. 9 is a perspective view schematically illustrating a sintered body for an excavation tool, according to another embodiment of the present invention; BEST MODE
Hereinafter, the present invention will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.
FIG. 3 is a perspective view schematically illustrating a sintered body 10 for an excavation tool, according to an embodiment of the present invention. FIG. 4 is a plan view of the sintered body 10 of FIG. 3, according to an embodiment of the present invention. FIG. 5 is a side view of the sintered body 10 of FIG. 3, according to an embodiment of the present invention. FIG. 6 is a sectional view of the sintered body 10 of FIG. 3, taken along line Vl-Vl of FIG. 1. FIG. 7 shows a substrate 20 from which a superhard layer 30 was removed from the sintered body 10 of FIG. 3, according to an embodiment of the present invention. FIG. 8 is a diagram for explaining a condition of use of the sintered body 10 of FIG. 3, according to an embodiment of the present invention.
Referring to FIGS. 3 through 8, the sintered body 10 includes the substrate 20 and the superhard layer 30.
The substrate 20 includes a body 22, supporting units 25, and an accommodation region 27.
The body 22 has a pillar form. In the current embodiment of the present invention, the body 22 has a cylinder form. However, the form of the body 22 can be not only a cylinder but also be various forms of prisms, for example, a hexagonal prism, an octagonal prism, and a decagonal prism. The body 22 has a length direction Z and at least an interface is formed in the length direction Z. The interface is a part that lies adjacent to the superhard layer 30. The body 22 is generally formed of an alloy of tungsten and cobalt.
The supporting units 25 are formed extending from the body 22. More specifically, the supporting units 25 are extended in the length direction Z of the body 22 illustrated in FIG. 3. The supporting units 25 are arranged along the circumference of the body 22, and are spaced apart from each other in a circumference direction of the body 22 at regular intervals. The supporting units 25 that are adjacent to each other in the current embodiment are arranged in the circumference direction of the body 22 at regular intervals. In the current embodiment, the supporting units 25 are formed extending from the body 22, and thus, the material for forming the supporting units 25 is the same with that of the body 22. The number of the supporting units 25 may be prepared as follows.
That is, when the diameter d of the body 22 in the substrate 20 is 10 mm or less, the number of the supporting units 25 may be 2 through 10. When the number of the supporting units 25 is 2 or less, a plurality of cutting edges 35 cannot be formed. When the number of the supporting units 25 is 10 or greater, the intervals between the supporting units 25 are too small and thus the supporting units 25 cannot be physically formed. Also, the strength of the superhard layer 30, having the plurality of cutting edges 35 that are formed with the supporting units 25, is not sufficient.
Meanwhile, when the diameter d of the body 22 in the substrate 20 is 10 mm or above and 20 mm or less, the number of the supporting units 25 may be 2 through 30. When the number of the supporting units 25 is 2 or less, the plurality of cutting edges 35 cannot be formed. When the number of the supporting units 25 is 30 or greater, the intervals between the supporting units 25 are too small and thus the supporting units 25 cannot be physically formed. Also, the strength of the superhard layer 30, having the plurality of cutting edges 35 that are formed with the supporting units 25, is not sufficient.
When the diameter d of the body 22 in the substrate 20 is 20 mm or above and 100 mm or less, the number of the supporting units 25 may be 2 through 100. When the number of the supporting units 25 is 2 or less, the plurality of cutting edges 35 cannot be formed. When the number of the supporting units 25 is 100 or greater, the intervals between the supporting units 25 are too small and thus the supporting units 25 cannot be physically formed. Also, the strength of the superhard layer 30, having the plurality of cutting edges 35 that are formed by the supporting units 25, is not sufficient.
The accommodation region 27 is a space formed in the body 22 and the supporting units 25. In the accommodation region 27, the superhard layer 30 which will be described later is charged.
The superhard layer 30 is charged and formed in the accommodation region 27, and may be formed of at least one of diamond and Cubic Boron Nitride (CBN). The superhard layer 30 is combined with the body 22 and the supporting units 25 after superhard materials in a powder form are charged in the accommodation region 27 and then the superhard materials are sintered in a sintering furnace under high temperature and high pressure. The superhard layer 30 is formed of the superhard materials having a hardness that is higher than that of the substrate 20, and thus, substantially performs excavation functions during the excavating for oil in an oil well. The superhard layer 30 has a plurality of interfaces that are adjacent to the supporting units 25 and the edges of the interfaces form the cutting edges 35. The cutting edges 35 directly contact with an object to be excavated, such as a subterranean base rock 100, and cut the object to be excavated.
The interfaces between the supporting units 25 and the superhard layer 30 may be formed to cross the length direction Z of the body 22. Meanwhile, as in the current embodiment, the interfaces between the supporting units 25 and the superhard layer 30 may be also formed to be parallel to the length direction Z of the body 22. More specifically, as in the current embodiment, the supporting units 25 may be extended from one section of the body 22 so as to be parallel to the length direction Z of the body 22 or extended from one section of the body 22 to be inclined with respect to the length direction Z of the body 22.
A manufacture method and operation of the sintered body 10 including the elements described above are described in more detail.
Firstly, as illustrated in FIG. 7, the substrate 20 is formed. The substrate 20 is formed by processing the cylinder-form body 22 and the supporting units 25 extended from the body 22. The processing method of the supporting units 25 of the body 22 include machining using a lathe, electrical discharge machining, or molding a powder-form tungsten-cobalt alloy in a mold and then sintering the molded alloy in a sintering furnace under high temperature and high pressure.
When a manufacture of the substrate 20 is completed, the superhard material such as diamond or CBN is charged in the accommodation region 27 of the substrate 20 and then is sintered in a sintering furnace under high temperature and high pressure, thereby manufacturing the sintered body 10 including the substrate 20 and the superhard layer 30 to which the superhard material is combined. The sintering process in the sintering furnace is the same with that of the conventional sintered body for an excavation tool and thus the detailed description thereof is omitted. In the sintered body 10 manufactured as above, the bonded surface between the substrate 20 and the superhard layer 30 increases, compared with that of a conventional sintered body 1 , due to the interface between the supporting units 25 and the superhard layer 30. Accordingly, the superhard layer 30 is bonded more firmly to the substrate 20. Meanwhile, as illustrated in FIG. 8, the sintered body 10 rotates and excavates the subterranean base rock 100. In such an excavating process, the material having the lower hardness is firstly worn away due to a hardness difference between the object to be excavated and the sintered body 10, while the sintered body 10 contacts to the subterranean base rock 100. That is, the subterranean base rock 100 has a hardness that is higher than that of the substrate 20 and lower than that of the superhard layer 30. Accordingly, the supporting units 25 are fractionized with the subterranean base rock 100 and are worn away. When the supporting units 25 are worn away, the circumference of the superhard layer 30, in a toothed wheel form, rotates and contacts with the subterranean base rock 100. As a result, the plurality of cutting edges 35 of the superhard layer 30 having a hardness that is higher than that of the subterranean base rock 100 is formed. Accordingly, a performance of cutting and excavating the subterranean base rock 100 with the sintered body 10 according to the current embodiment significantly increases, compared with that of the conventional sintered body 1.
According to the present invention, the sintered body 10, for an excavation tool, capable of maintaining the number of rotations to be the same with that of the conventional sintered body 1 for an excavation tool and significantly increasing a performance of excavating the subterranean base rock 100 can be provided.
According to the detailed description of the invention, a superhard layer is formed of at least one of diamond and Cubic Boron Nitride (CBN). However, although the superhard layer is not formed of diamond or CBN, the object of the present invention can be achieved when a material having a hardness that is higher than that of a subterranean base rock is used.
According to the detailed description of the invention, the supporting units are arranged along the circumference of the body. However, although the supporting units are not arranged along the circumference of the body, the object of the present invention can be achieved when a plurality of cutting edges is formed for an object to be excavated.
According to the detailed description of the invention, the interfaces between the supporting units and the superhard layer may be formed to be parallel to the length direction of the body. However, the object of the present invention can be achieved even though the interfaces between the supporting units and the superhard layer are formed to cross the length direction of the body.
According to the detailed description of the invention, the supporting units are arranged to be spaced apart from each other in regular intervals. However, as illustrated in FIG. 9, the object of the present invention can be achieved even though the supporting units are not arranged to be spaced apart from each other in irregular intervals.

Claims

1. A sintered body for an excavation tool comprising: a substrate having a pillar-form body, a plurality of supporting units extended from the body in a length direction of the body and arranged to be spaced apart from each other in a circumference direction of the body, and an accommodation region formed in the body and the supporting units; and a superhard layer combined with the substrate, the superhard layer being formed by charging superhard materials, in a powder form and having a hardness that is higher than that of the substrate, in the accommodation region, and by sintering the charged superhard materials under high temperature and high pressure.
2. The sintered body for an excavation tool of claim 1 , wherein the superhard layer is formed of at least one of diamond and Cubic Boron Nitride (CBN).
3. The sintered body for an excavation tool of claim 1 , wherein the supporting units are arranged along the circumference of the body.
4. The sintered body for an excavation tool of claim 1 , wherein interfaces between the supporting units and the superhard layer are formed to cross the length direction of the body.
5. The sintered body for an excavation tool of claim 1 , wherein interfaces between the supporting units and the superhard layer are formed to be parallel to the length direction of the body.
6. The sintered body for an excavation tool of claim 1 , wherein the supporting units are arranged to be spaced apart from each other in regular intervals.
7. A sintered body for an excavation tool comprising: a substrate formed of an alloy of tungsten and cobalt and having a cylinder-form body, a plurality of supporting units extended from the body in a length direction of the body and arranged to be spaced apart from each other in a circumference direction of the body, and an accommodation region formed in the body and the supporting units; and a superhard layer combined with the substrate, wherein the superhard layer being formed by charging superhard materials, in a powder form and having the hardness that is higher than that of the substrate, in the accommodation region, and by sintering the charged superhard materials under high temperature and high pressure, and the edges of the superhard layer that are adjacent to the supporting units form a plurality of cutting edges.
8. The sintered body for an excavation tool of claim 7, wherein when the body has a diameter of 10 mm or less, the number of the supporting units is 2 through 10.
9. The sintered body for an excavation tool of claim 7, wherein when the body has a diameter of 10 mm or above and 20 mm or less, the number of the supporting units is 2 through 30.
10. The sintered body for an excavation tool of claim 7, wherein when the body has a diameter of 20 mm or above and 100 mm or less, the number of the supporting units is 2 through 100.
PCT/KR2008/001794 2007-03-30 2008-03-31 Sintered body for excavating tool WO2008120937A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2007-0032001 2007-03-30
KR1020070032001A KR20080089036A (en) 2007-03-30 2007-03-30 Sintered body for excavating tool

Publications (1)

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WO2008120937A1 true WO2008120937A1 (en) 2008-10-09

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Family Applications (1)

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PCT/KR2008/001794 WO2008120937A1 (en) 2007-03-30 2008-03-31 Sintered body for excavating tool

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WO (1) WO2008120937A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604106A (en) * 1984-04-16 1986-08-05 Smith International Inc. Composite polycrystalline diamond compact
US5351772A (en) * 1993-02-10 1994-10-04 Baker Hughes, Incorporated Polycrystalline diamond cutting element
WO2004040096A1 (en) * 2002-10-30 2004-05-13 Element Six (Proprietary) Limited Composite tool insert

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604106A (en) * 1984-04-16 1986-08-05 Smith International Inc. Composite polycrystalline diamond compact
US5351772A (en) * 1993-02-10 1994-10-04 Baker Hughes, Incorporated Polycrystalline diamond cutting element
WO2004040096A1 (en) * 2002-10-30 2004-05-13 Element Six (Proprietary) Limited Composite tool insert

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