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WO2016114344A1 - Pointe de trépan et trépan - Google Patents

Pointe de trépan et trépan Download PDF

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Publication number
WO2016114344A1
WO2016114344A1 PCT/JP2016/050973 JP2016050973W WO2016114344A1 WO 2016114344 A1 WO2016114344 A1 WO 2016114344A1 JP 2016050973 W JP2016050973 W JP 2016050973W WO 2016114344 A1 WO2016114344 A1 WO 2016114344A1
Authority
WO
WIPO (PCT)
Prior art keywords
tip
excavation
hard layer
rear end
bit
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.)
Ceased
Application number
PCT/JP2016/050973
Other languages
English (en)
Japanese (ja)
Inventor
エコ ワルドヨ アフマディ
松尾　俊彦
稚晃 桜沢
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.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
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
Priority claimed from JP2016004695A external-priority patent/JP6701742B2/ja
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to CA2973673A priority Critical patent/CA2973673C/fr
Priority to AU2016207490A priority patent/AU2016207490B2/en
Priority to US15/543,158 priority patent/US10465448B2/en
Priority to EP16737415.6A priority patent/EP3246511B1/fr
Priority to CN201680005575.XA priority patent/CN107109905B/zh
Priority to KR1020177019391A priority patent/KR102528631B1/ko
Publication of WO2016114344A1 publication Critical patent/WO2016114344A1/fr
Anticipated expiration legal-status Critical
Priority to ZA2017/04914A priority patent/ZA201704914B/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
    • E21B10/52—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type with chisel- or button-type inserts
    • 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
    • E21B10/56—Button-type inserts

Definitions

  • the present invention relates to a drilling tip that is attached to a distal end portion of a drilling bit to perform excavation, and a drilling bit in which such a drilling tip is attached to the distal end portion.
  • Such a drilling tip is known in which a tip of a tip body made of cemented carbide is coated with a hard layer made of a sintered body of polycrystalline diamond harder than the tip body.
  • a hard layer is provided on the tip portion of the chip body having a cylindrical rear end portion and a hemispherical tip portion having an outer diameter that decreases toward the tip side.
  • Patent Document 2 describes a method for manufacturing such a polycrystalline diamond sintered body
  • Patent Documents 3 and 4 describe a manufacturing apparatus.
  • the thickness of this hard layer is the rear end of a chip
  • the present invention has been made under such a background, and when the outer diameter of the rear end portion of the tip body is formed larger than the inner diameter of the mounting hole, the drill bit can be polished even if the outer periphery of the drill tip is polished.
  • the tip body surface is not exposed at the exposed portion of the tip of the tip, and such a drilling tip is attached.
  • Another object of the present invention is to provide a drill bit that has a long life and can perform efficient drilling.
  • the excavation tip of the present invention is an excavation tip that is attached to the distal end portion of an excavation bit and performs excavation.
  • a hard layer made of a diamond sintered body that is harder than the chip body to be coated, the chip body having a rear end portion that has a columnar shape or a disk shape centered on the chip center line, and the rear end portion
  • an intermediate portion having a smaller outer diameter than the rear end portion located on the tip end side in the tip center line direction, and further toward the tip end side located on the tip side in the tip center line direction with respect to the intermediate portion.
  • the outer diameter of the serial hard layer is characterized in that it is equal to the outer diameter of the rear end portion of the chip body.
  • the excavation bit of the present invention is an excavation bit in which such excavation tip is attached to the distal end portion of the bit body, and an attachment hole is formed in the distal end portion of the bit body.
  • the rear end portion of the chip main body and at least a part of the intermediate portion covered with the hard layer are embedded in the mounting hole and attached.
  • an intermediate portion having a smaller outer diameter than the rear end portion between the cylindrical or disc-like rear end portion of the tip body and the front end portion whose outer diameter decreases toward the front end side.
  • the outer diameter of the distal end portion gradually decreases from the middle portion toward the distal end side.
  • the hard layer is covered from the front end portion to the outer periphery of the intermediate portion, and the outer diameter of the hard layer in the intermediate portion is equal to the outer diameter of the rear end portion of the chip main body.
  • the outer circumference of the excavation tip is polished when the outer diameter of the section is larger than the inner diameter of the mounting hole, the outer circumference of the intermediate section is covered with a hard layer having a thickness that is the difference between the outer diameter of the rear end section and the intermediate section. Left behind.
  • such a excavation tip is embedded in the mounting hole at the rear end portion of the tip body and at least a part of the intermediate portion covered with the hard layer.
  • By attaching it it is possible to prevent the surface of the chip body having a lower hardness than the hard layer from being exposed and exposed from the front end surface of the bit body. It is possible to prevent a situation in which wear progresses due to contact and breaks the tip of the excavation tip. For this reason, it is possible to provide a drilling tip and a drilling bit having a long life by fully exhibiting the wear resistance of the hard layer made of a diamond sintered body, and to perform efficient drilling.
  • the outer diameter of the intermediate portion is smaller than the rear end portion, the outer diameter becomes smaller toward the front end side, for example, a truncated cone shape, or if the front end portion is hemispherical,
  • the outer peripheral surface smoothly connected to the tip end portion may be a curved surface.
  • the layer thickness in the radial direction perpendicular to the chip center line of the hard layer in the state where the hard layer is coated is increased. It can be constant over the chip centerline direction.
  • the intermediate portion has a columnar shape or a disc shape centering on the chip center line having a smaller outer diameter than the rear end portion.
  • the width of the hard layer coated on the outer periphery of the intermediate portion in the direction of the chip center line is preferably in the range of 1 mm to 5 mm. If the width is less than 1 mm, the surface of the tip body may be exposed when the excavation tip is shallowly buried in the attachment hole or when the opening of the attachment hole is worn during excavation. . On the other hand, if the width of the hard layer exceeds 5 mm, if the outer diameter of the excavation tip is larger than the inner diameter of the mounting hole, it takes much time and labor to polish to a predetermined outer diameter. Further, it is desirable that the thickness of the hard layer coated on the outer periphery of the intermediate portion is in the range of 300 ⁇ m to 1200 ⁇ m.
  • a width of the portion buried in the mounting hole in the hard layer coated on the intermediate portion in the chip center line direction is 0.5 mm to 4.5 mm. Further, in the excavation bit, it is preferable that a width in the tip center line direction of a portion of the hard layer covered by the intermediate portion that is not buried in the attachment hole is 0.5 mm to 1.0 mm. .
  • the surface of the low-altitude chip body is prevented from being exposed at the portion exposed from the distal end surface of the excavation bit. be able to. As a result, it is possible to extend the life of the excavation tip and the excavation bit by the hard layer having high wear resistance and perform efficient excavation.
  • FIG. 1 is a cross-sectional view showing an embodiment of the excavation tip 1 of the present invention
  • FIG. 2 is a cross-sectional view showing an embodiment of the excavation bit of the present invention to which the excavation tip 1 of this embodiment is attached
  • 3 is an enlarged cross-sectional view showing a portion where the excavation tip 1 is attached in the excavation bit of this embodiment.
  • the excavation tip 1 of this embodiment includes a tip body 2 made of a hard material such as cemented carbide, a hard layer 3 made of a diamond sintered body harder than the tip body 2 and covering the surface of the tip body 2. It has.
  • the chip body 2 has a rear end portion (lower portion in FIGS. 1 and 3) 2A having a columnar shape or a disc shape centered on the chip center line C, and a tip end portion (in FIGS. 1 and 3).
  • the upper portion 2B has a hemispherical shape having a center slightly on the tip center line C with a radius slightly smaller than the radius of the cylinder or disk formed by the rear end portion 2A.
  • the outer diameter from the chip center line C is formed so as to gradually decrease. That is, the excavation tip 1 of this embodiment is a button tip.
  • the radius of the rear end in the tip center line C direction of the front end portion 2B is a value smaller than the radius of the rear end portion 2A by a layer thickness T described later.
  • an intermediate portion 2C having an outer diameter slightly smaller than the outer diameter of the cylinder or disk formed by the rear end portion 2A is formed between the rear end portion 2A and the front end portion 2B.
  • the rear end portion 2A, the front end portion 2B, and the intermediate portion 2C are integrally formed of a hard material such as the above-mentioned cemented carbide.
  • the cross section perpendicular to the chip center line C of the chip body 2 has a circular shape centering on the chip center line C in any of the rear end portion 2A, the front end portion 2B, and the intermediate portion 2C.
  • the intermediate portion 2C has a columnar shape or a disc shape with the chip center line C as the center like the rear end portion 2A, and is coaxial with the rear end portion 2A so that the outer diameter is small. Is formed.
  • a table surface 2D which is an annular flat surface facing the tip side of the chip center line C (upper side in FIGS. 1 and 3). Is formed.
  • the table surface does not need to be a surface perpendicular to the chip center line C, and may be inclined by 0 to 45 ° (preferably 0 to 30 °) with respect to the radial direction, for example. Further, the table surface 2D and the outer peripheral surface of the intermediate portion 2C may be connected by a curved surface or an inclined surface. In other words, in the cross section passing through the chip center line C of the chip body 2, it is not necessary that the inner peripheral end of the table surface 2D and the rear end of the outer peripheral surface of the intermediate part 2C are connected at right angles, but by an arc, a straight line, etc. It may be connected.
  • the tip of the outer peripheral surface of the rear end portion 2A and the rear end of the outer peripheral surface of the intermediate portion may be connected by a concave curve. That is, the table surface 2D may be an annular curved surface.
  • the radius of the hemisphere formed by the tip 2B is made equal to the radius of the cylinder or disk formed by the intermediate 2C, and the hemisphere formed by the surface of the tip 2B is the outer peripheral surface of the intermediate 2C. It is formed to be smoothly connected to the cylindrical surface.
  • the hard layer 3 coated on the surface of the chip body 2 is a cylindrical surface formed by the hemispheric surface formed by the surface of the tip 2B and the outer periphery of the intermediate 2C from the tip 2B to the outer periphery of the intermediate 2C.
  • the outer peripheral surface of the rear end portion 2A and the rear end surface of the chip body 2 are not covered.
  • the hard layer 3 is covered over the entire outer peripheral surface of the intermediate portion 2C.
  • the hard layer 3 has a radius from the chip center line C of the surface of the hard layer 3 at a portion covered by the outer peripheral surface of the intermediate portion 2C, and a radius from the chip center line C of the outer peripheral surface of the rear end portion 2A. Is equal to. That is, the outer diameter of the hard layer 3 in the intermediate part 2C is made equal to the outer diameter of the rear end part 2A of the chip body 2.
  • the hard layer 3 has a diamond particle size constituting the diamond sintered body and a content for each particle size, a binder metal composition and content, or a composition and content of additive particles other than diamond particles.
  • the seeded hard layer may be a single hard layer, or may be a hard layer of two layers as shown in FIGS. 1 and 3 in which these elements are different, or a hard layer of a multilayer structure of three or more layers.
  • the hard layer 3 is composed of a plurality of layers, as shown in FIGS. 1 and 3, the outermost layer covering the tip 2B and the outermost layer covering the intermediate portion are composed of one layer. Is preferred.
  • Sintering of the excavation tip 1 in which the hard layer 3 is coated on the tip body 2 is basically performed in the diamond stable region. A known sintering method as described in Patent Literature 2, Patent Literature 3 4 is possible with the device described in 4.
  • the outermost layer of the hard layer 3 has higher hardness than the layer adjacent to the inner side in order to achieve high wear resistance and relaxation of the stress of the diamond sintered body by the hard layer 3, that is, the layer adjacent to the inner side. It is desirable that the hardness is lower than that of the outermost layer.
  • the hard layer 3 has a thick layer at the tip on the tip center line C of the tip 2B, and the layer thickness decreases from the tip toward the outer peripheral side of the tip 2B.
  • the excavation bit to which the excavation tip 1 is attached is provided with a bit body 11 formed of a steel material or the like and having a substantially bottomed cylindrical shape centering on an axis O as shown in FIG.
  • the bottom part is a tip part (upper part in FIG. 2) and the excavation tip 1 is attached.
  • An internal thread portion 12 is formed on the inner periphery of the cylindrical rear end portion (lower portion in FIG. 2).
  • the excavation rod connected to the excavator is screwed into the female screw portion 12 to transmit the striking force and thrust toward the front end side in the direction of the axis O, and the rotational force around the axis O, so that the excavation tip 1
  • the rock mass is crushed to form an excavation hole.
  • the front end portion of the bit body 11 has a slightly larger outer diameter than the rear end portion, and a plurality of discharge grooves 13 extending in parallel to the axis O are spaced apart in the circumferential direction on the outer periphery of the front end portion. Is formed. Crushed debris generated by crushing the rock by the excavation tip 1 is discharged to the rear end side through the discharge groove 13.
  • a blow hole 14 is formed along the axis O from the bottom surface of the female screw portion 12 of the bottomed bit body 11. The blow hole 14 branches obliquely at the tip of the bit body 11 and opens at the tip surface of the bit body 11, and ejects a fluid such as compressed air supplied via the drilling rod to Promote emissions.
  • the front end surface of the bit body 11 has a circular face surface 15 centering on an axis O perpendicular to the inner peripheral axis O, and a rear end side located on the outer periphery of the face surface 15 toward the outer periphery. And a frustoconical gauge surface 16 facing toward the surface.
  • the blow hole 14 opens to the face surface 15, and the tip of the discharge groove 13 opens to the gauge surface 16.
  • a plurality of mounting holes 17 having a circular cross section are formed on the face surface 15 and the gauge surface 16 so as to avoid the openings of the blow holes 14 and the discharge grooves 13 respectively. It is formed vertically.
  • the excavation tip 1 is inserted into the mounting hole 17 as shown in FIG. 3, and the rear end portion 2A of the tip body 2 and the rear end portion 2A of the intermediate portion 2C covered with the hard layer 3 are provided.
  • the excavation tip 1 is fixed to the mounting hole 17 by being fitted or brazed by press fitting, shrink fitting or the like in a state where at least a part of the side is buried in the mounting hole 17. That is, the excavation tip 1 is embedded in the attachment hole 17 and attached.
  • the remaining portion of the intermediate portion 2C on the front end portion 2B side and the front end portion 2B are respectively protruded from the front end surface of the bit body 11, that is, the face surface 15 and the gauge surface 16, and further the chip center line C is perpendicular to the face surface 15 and the gauge surface 16.
  • a part of the intermediate part 2 ⁇ / b> C is buried in the mounting hole 17, but the whole intermediate part 2 ⁇ / b> C may be buried.
  • the rear end of the excavation tip 1 on the distal end side of the rear end portion 2A having a large diameter of the tip body 2 is arranged.
  • An intermediate portion 2C having a smaller diameter than the portion 2A is provided, and a distal end portion 2B for excavating the outer diameter from the tip center line C with a smaller outer diameter from the tip center line C is provided on the further distal end side of the intermediate portion 2C.
  • the hard layer 3 is coated on the surface of 2B and the intermediate part 2C, and the outer diameter of the hard layer 3 on the outer periphery of the intermediate part 2C is made equal to the rear end part 2A.
  • the outer peripheral surface of the rear end portion 2A and the surface of the hard layer 3 on the outer periphery of the intermediate portion 2C in the tip body 2 of the excavation tip 1 are polished. Even if the grinding allowance is within the range of the outer diameter difference between the rear end portion 2A and the intermediate portion 2C, that is, the thickness of the hard layer 3 on the outer periphery of the intermediate portion 2C, the hard layer 3 is placed on the outer periphery of the intermediate portion 2C. Left behind. This is the same even when the outer diameter of the sintered excavation tip 1 can be buried in the mounting hole 17 as it is, and is not polished.
  • the width S in the chip center line C direction of the portion buried in the mounting hole 17 in the hard layer 3 covered with the intermediate portion 2C is 0.5 mm to 4.5 mm.
  • the width S is 0.5 mm or more, the periphery of the opening of the mounting hole 17 of the face surface 15 or the gauge surface 16 is worn by excavation debris during excavation, and the portion where the excavation tip 1 is buried is Even if it is exposed, the hard layer 3 is exposed, so that the surface of the chip body 2 is not exposed.
  • the excavation tip 1 can be prevented from being broken, so that the wear resistance of the hard layer 3 covering the tip 2B can be sufficiently exerted to enable long-term excavation.
  • the width S exceeds 4.5 mm, the region of the hard layer 3 increases, and it takes a lot of time and labor when polishing the outer periphery of the excavation tip 1, which is not preferable.
  • the width L in the chip center line direction of the portion not buried in the mounting hole 17 is preferably 0.5 mm to 1.0 mm.
  • the projecting length to the boundary between the intermediate portion 2C is preferably 0.5 mm to 1.0 mm.
  • the excavation tip 1 can be prevented from being broken, so that the wear resistance of the hard layer 3 covering the tip 2B can be sufficiently exerted to enable long-term excavation.
  • the width L exceeds 1.0 mm, the region of the hard layer 3 increases, and it takes a lot of time and labor to polish the outer periphery of the excavation tip 1, which is not preferable.
  • the intermediate portion 2C of the tip body 2 has a columnar shape or a disc shape centered on the tip centerline C that is the centerline of the columnar shape or disc formed by the rear end portion 2A.
  • the rear end portion 2A and the intermediate portion 2C are coaxial and have a multi-stage columnar shape or a multi-stage disk shape whose diameter is reduced by one step toward the tip side of the chip body 2.
  • the chip body can be used no matter where the excavation chip 1 is buried in the mounting hole 17. 2 where the intermediate portion 2C protrudes from the face surface 15 or the gauge surface 16, the thickness of the hard layer 3 on the outer periphery can be made constant, and sufficient wear resistance can be ensured in this portion. It becomes possible.
  • the intermediate portion 2C is not formed in a columnar shape or a disk shape in this way, for example, it is formed in a truncated cone shape with the tip center line C gradually decreasing in outer diameter toward the tip side, or Similarly, even if the outer diameter gradually decreases toward the distal end side, the outer peripheral surface along the chip center line C may have a convex curve shape or a concave curve shape. Even in these cases, the layer thickness of the hard layer 3 becomes thicker toward the tip side, so that the wear resistance of the hard layer 3 in the portion where the intermediate portion 2C of the chip body 2 protrudes from the face surface 15 or the gauge surface 16 is improved. It can be secured sufficiently.
  • the width of the hard layer 3 covered on the outer periphery of the intermediate portion 2C in this way in the direction of the chip centerline C indicated by the symbol W in FIG. 1 (in the present embodiment, it is intermediate between the tip portion 2B indicated by the broken line in FIGS. 1 and 3) If the width in the tip center line C direction of the intermediate portion 2C between the boundary with the portion 2C and the boundary between the rear end portion 2A and the intermediate portion 2C) is too small, the excavation tip 1 is shallowly buried in the mounting hole 17 Or when the periphery of the opening of the mounting hole 17 in the bit body 11 is worn during excavation, the surface of the chip body 2 may be exposed (the width S is sufficient). There is a possibility that it cannot be secured).
  • the width W of the hard layer 3 is desirably in the range of 1 mm to 5 mm, and more desirably in the range of 2.0 mm to 4.0 mm.
  • the thickness of the hard layer 3 on the outer periphery of the intermediate portion 2C indicated by the symbol T in FIG. 1 is preferably in the range of 300 ⁇ m to 1200 ⁇ m, and more preferably in the range of 500 ⁇ m to 1000 ⁇ m. . If the layer thickness T is so thin that it is less than 300 ⁇ m, there is a possibility that the excavation tip 1 cannot be provided with a sufficient life no matter how hard layer 3 is covered. On the other hand, if the layer thickness T of the hard layer 3 is too thick so as to exceed 1200 ⁇ m, the volume of the hard layer 3 occupying the portion that is buried in the mounting hole 17 and does not contribute to wear prevention or excavation increases. Is. In addition, in the whole hard layer 3 formed in the intermediate part 2C, it is preferable that the layer thickness T becomes in said desirable range.
  • the position is specified as follows.
  • the diameter of the lower end surface of the rear end portion 2A is ⁇
  • the rear end of the portion having a diameter smaller than 93.3% of ⁇ is the boundary between the intermediate portion 2C and the rear end portion 2A (the rear end of the intermediate portion 2C).
  • the diameter of the rear end of the intermediate portion 2C is ⁇ ( ⁇ ⁇ ⁇ ⁇ 0.933)
  • the ratio h / H of the length h from the front end of the front end portion 2B to the rear end of the intermediate portion 2C with respect to the total length H of the chip main body 2 in the direction of the chip center line C is preferably 0.45 to 0.80. 0.50 to 0.75 is more preferable.
  • the present invention is applied to a button type excavation tip in which the tip 2B of the tip body 2 is hemispherical as described above has been described.
  • a so-called ballistic type drilling tip that has a bullet shape, and the rear end side of the tip part is conical and decreases in diameter toward the tip side, and the tip is smaller than the cylindrical rear end part of the tip body
  • the present invention can also be applied to a so-called spike type drilling tip having a spherical shape with a small radius.
  • the width W of the hard layer 3 (corresponding to the width of the intermediate layer 2C), the thickness T of the hard layer, the face surface 15 and the gauge surface 16 to the tip 2B shown in Table 1 are shown in Table 1.
  • the outer diameter of the hard layer 3 covered with the tip 2B is a cylinder formed by the rear end 2A of the tip body 2.
  • it is a button-type drilling tip having a hemispherical diameter equal to the outer diameter of the disc, and this diameter was 11 mm.
  • the thickness T of the hard layer 3 on the outer periphery of the intermediate part 2C of the chip body 2 is 400 ⁇ m in Examples 1 to 3, Comparative Examples 1, 2, 5, and 6, 350 ⁇ m in Example 4, and 1100 ⁇ m in Example 5.
  • Example 6 it was set to 600 ⁇ m, in Comparative Example 3 to 150 ⁇ m, and in Comparative Example 4 to 1500 ⁇ m.
  • the thickness in the tip center line C direction at the tip end of the tip 2B indicated by the symbol P in FIG. 1 is 1200 ⁇ m in Examples 1 to 3, Comparative Examples 1, 2, 5, and 6, 800 ⁇ m in Example 4, and in Example 5. 1150 ⁇ m, Example 6 was 1000 ⁇ m, Comparative Example 3 was 600 ⁇ m, and Comparative Example 4 was 1800 ⁇ m. Accordingly, in each of the examples and comparative examples, the outer diameter (diameter) of the rear end portion 2A of the chip body 2 is 11 mm, and the outer diameter of the intermediate portion 2C except for the comparative example 1 is 10.2 mm (the tip portion 2B is configured). The diameter of the hemisphere was 10.2 mm, and the length of the rear end 2A in the chip center line C direction was 7.5 mm.
  • the hard layer 3 has a two-layer structure as shown in FIG.
  • the outer layer of the hard layer 3 contains 30 vol% of diamond particles having a particle diameter of 2 to 4 ⁇ m, 70 vol% of diamond particles having a particle diameter of 20 to 40 ⁇ m, and 15 vol% of a metal binder of Ni: 100 wt% without containing additive particles. It was set as the high hardness layer formed by the content rate with respect to the whole layer containing particles.
  • the average thickness of the outer layer of the hard layer 3 is 800 ⁇ m in Examples 1 to 3, Comparative Examples 1, 2, 5, and 6, 500 ⁇ m in Example 4, 900 ⁇ m in Example 5, 800 ⁇ m in Example 6, and Comparative Example 3 In Comparative Example 4, it was set to 1600 ⁇ m.
  • the inner layer of the hard layer 3 is formed of 60 vol% of diamond particles having a particle size of 4 to 6 ⁇ m, 40 vol% of TaC particles of 0.5 to 2 ⁇ m as additive particles, and 10 vol% of Co: 100 wt% metal binder. A low hardness layer was used.
  • the average layer thickness of the inner layer of the hard layer 3 is 200 ⁇ m in Examples 1 to 3, Comparative Examples 1, 2, 5, and 6, 350 ⁇ m in Example 4, 200 ⁇ m in Example 5, 300 ⁇ m in Example 6, and Comparative Example 3 4 was 120 ⁇ m.
  • the average layer thickness of the outer layer of the hard layer 3 is the center of the hemisphere formed by the layer thickness in the direction of the tip center line C in the cross section along the tip center line C and the tip of the excavation tip as shown in FIG. (On the intersection of the dotted line indicating the boundary between the intermediate part 2C and the tip part 2B in FIG. 1 and the chip center line C) on the two straight lines intersecting the chip center line C at an intersection angle of 30 ° and 60 ° It was set as the average value with the layer thickness in the position.
  • the average layer thickness of the inner layer of the hard layer 3 is the crossing angle of 30 ° and 60 ° with respect to the chip center line C through the layer thickness in the chip center line direction and the center of the hemisphere formed by the tip of the excavation chip.
  • the average value of the layer thicknesses at positions on two intersecting straight lines was used.
  • the rear end 2A is exposed by 1 mm in the chip center line C direction from the boundary between the rear end 2A and the front end 2B (from the face surface 15 and the gauge surface 16 to the rear end 2A and the front end.
  • the excavation tip was attached to the bit body 11 so that the distance to the boundary with 2B was 1 mm.
  • Comparative Example 4 In Comparative Example 4 in which the thickness T of the hard layer 3 was large, the total excavation distance was shorter than in Examples 1 to 6.
  • Comparative Example 5 In Comparative Example 5 in which the protruding length L of the intermediate portion 2C is long, the length of the portion embedded in the bit body 11 of the intermediate portion 2C (S in FIG. 3) is short and breaks at the base of the excavation tip. Further, in Comparative Example 6 in which the protruding length L of the intermediate portion 2C is 0 mm, that is, only the distal end portion 2B protrudes from the face surface 15 and the gauge surface 16, the bit body 11 is worn out in advance, and the drill body inserts from the bit body 11 Was the result.
  • Example 2 the thickness T of the hard layer 3 and the protruding length L of the intermediate portion 2C are the same, and the life of the hard layer 3 having a small width W is extended by 2-3 times or more. I was able to.
  • the present invention it is possible to prevent the surface of the low-altitude chip body from being exposed at the portion exposed from the tip surface of the excavation bit, and the excavation chip is formed by the hard layer having high wear resistance. In addition, it is possible to extend the life of the drill bit and perform efficient drilling.

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  • Life Sciences & Earth Sciences (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

La présente invention concerne une pointe de trépan. Dans ladite invention, le corps de pointe de la pointe de trépan possède une partie d'extrémité arrière cylindrique ou en forme de disque, une partie intermédiaire qui possède un diamètre extérieur plus petit que celui de la partie d'extrémité arrière, et une partie d'extrémité avant dans laquelle le diamètre extérieur diminue progressivement depuis la ligne centrale de la pointe vers l'extrémité avant. Le corps de pointe est couvert par une couche dure, de la surface de la partie d'extrémité avant du corps de pointe à la périphérie extérieure de la partie intermédiaire. Le diamètre extérieur de la couche dure au niveau de la partie intermédiaire est égal au diamètre extérieur de la partie d'extrémité arrière.
PCT/JP2016/050973 2015-01-14 2016-01-14 Pointe de trépan et trépan Ceased WO2016114344A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CA2973673A CA2973673C (fr) 2015-01-14 2016-01-14 Pointe de trepan et trepan
AU2016207490A AU2016207490B2 (en) 2015-01-14 2016-01-14 Drill tip and drill bit
US15/543,158 US10465448B2 (en) 2015-01-14 2016-01-14 Drill bit insert and drill bit
EP16737415.6A EP3246511B1 (fr) 2015-01-14 2016-01-14 Pointe de trépan et trépan
CN201680005575.XA CN107109905B (zh) 2015-01-14 2016-01-14 挖掘刀片及挖掘钻头
KR1020177019391A KR102528631B1 (ko) 2015-01-14 2016-01-14 굴삭 팁 및 굴삭 비트
ZA2017/04914A ZA201704914B (en) 2015-01-14 2017-07-19 Drill tip and drill bit

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JP2015-005175 2015-01-14
JP2015005175 2015-01-14
JP2016-004695 2016-01-13
JP2016004695A JP6701742B2 (ja) 2015-01-14 2016-01-13 掘削チップおよび掘削ビット

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6299083A (ja) * 1985-08-22 1987-05-08 デ　ビア−ズ　インダストリアル　ダイアモンド　デイビジヨン（プロプライエタリイ）リミテツド 工具
JPH0446183U (fr) * 1990-08-22 1992-04-20
JPH0633677A (ja) * 1992-05-27 1994-02-08 De Beers Ind Diamond Div Ltd 研磨工具
US5379854A (en) * 1993-08-17 1995-01-10 Dennis Tool Company Cutting element for drill bits

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6299083A (ja) * 1985-08-22 1987-05-08 デ　ビア−ズ　インダストリアル　ダイアモンド　デイビジヨン（プロプライエタリイ）リミテツド 工具
JPH0446183U (fr) * 1990-08-22 1992-04-20
JPH0633677A (ja) * 1992-05-27 1994-02-08 De Beers Ind Diamond Div Ltd 研磨工具
US5379854A (en) * 1993-08-17 1995-01-10 Dennis Tool Company Cutting element for drill bits

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3246511A4 *

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