EP3421205A1 - Bohrer für die meisselnde bearbeitung von gestein - Google Patents

Bohrer für die meisselnde bearbeitung von gestein Download PDF

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Publication number
EP3421205A1
EP3421205A1 EP17178102.4A EP17178102A EP3421205A1 EP 3421205 A1 EP3421205 A1 EP 3421205A1 EP 17178102 A EP17178102 A EP 17178102A EP 3421205 A1 EP3421205 A1 EP 3421205A1
Authority
EP
European Patent Office
Prior art keywords
drill
intake
blades
base
drill head
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.)
Withdrawn
Application number
EP17178102.4A
Other languages
German (de)
English (en)
French (fr)
Inventor
Klaus-Peter Bohn
Roland Foser
Markus Hartmann
Bastian Pluemacher
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Priority to EP17178102.4A priority Critical patent/EP3421205A1/de
Priority to US16/626,184 priority patent/US11850716B2/en
Priority to PCT/EP2018/066259 priority patent/WO2019002025A1/de
Priority to JP2019572094A priority patent/JP6925456B2/ja
Priority to EP18731458.8A priority patent/EP3645229B1/de
Priority to CN201880042833.0A priority patent/CN110799316B/zh
Publication of EP3421205A1 publication Critical patent/EP3421205A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/02—Percussive tool bits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • B28D1/146—Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
    • B28D7/02—Accessories specially adapted for use with machines or devices of the preceding groups for removing or laying dust, e.g. by spraying liquids; for cooling work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0003—Details of shafts of percussive tool bits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/72—Stone, rock or concrete

Definitions

  • the present invention relates to a drill for the chiselling of rocks.
  • the invention relates to a drill in which emerging cuttings can be removed via a hollow shaft.
  • the drill has and does not require a helical shank.
  • the drill for the chisel machining of rock has a striking surface at a male end, a hollow shank within which a delivery channel is provided and a drill head.
  • the drill head has three or more blades and one or more suction ports on one end face.
  • Within the drill head are intake ports that connect the intake ports with the delivery channel.
  • a first portion of the intake passage adjacent the intake port has a first incline relative to the drill axis and a second portion of the intake passage adjacent the hollow shaft has a second incline opposite the drill axis.
  • the second slope is greater than the first slope.
  • the smaller inclination of the intake duct in the upper region is advantageous in terms of degradation performance.
  • the shock wave sees no or less radial deflections due to the more axis-parallel interfaces.
  • the first slope may be less than 5 degrees.
  • the second slope can be between 15 degrees and 30 degrees.
  • the second portion of the intake passage is continuously curved.
  • the drill head provides a pedestal in which the cutters are embedded, the pedestal partially surrounding the cutters in a circumferential direction.
  • the base is at least partially made of a sintered steel.
  • a portion of the socket surrounding the blades may be tungsten carbide.
  • the base is made entirely of a sintered steel.
  • a cross-section of the intake ducts increases from the intake port to the delivery channel increases.
  • the intake openings are triangular-shaped.
  • the cutting edges of the drill head are preferably made of sintered tungsten carbide.
  • the hard material is particularly suitable for chiselling stone.
  • the blades may have a rake face and a flank face, both forming part of the face and contacting each other along a chisel edge.
  • the geometry is particularly well suited for the chiselling of rocks.
  • Fig. 1 shows an exemplary drill 1.
  • the drill 1 has a drill head 2 with suction ports 3, a hollow shaft 4 with a suction port 5 and a An insertion end 6 with a striking surface 7.
  • a collar 8 can surround the suction connection 5 .
  • the drill 1 is designed for the mining of mineral building materials, such as concrete, brick.
  • the insertion end 6 can be used in a hand tool, for example a drill, a hammer drill.
  • a striking mechanism of the power tool periodically strikes the striking surface 7 at the insertion end 6.
  • the shock wave of the stroke passes through the hollow shaft 4 in the direction of impact 9 up to the drill head 2.
  • the drill head 2 shatters the mineral material.
  • the drill 1 is preferably rotated between the blows in a direction of rotation 10 about its drill axis 11 .
  • the drill 1 strikes in succession in different orientations on the material.
  • the resulting cuttings can be removed directly from the end face 12 of the drill 1 from the borehole.
  • a vacuum cleaner is connected to the cuff 8 .
  • the air stream sucks the drill cuttings against the intake openings 3 directly at the end face 12 of the drill 1 .
  • the cuttings are removed within the hollow shaft 4 .
  • the exemplary drill head 2 has a base 13 and a plurality of cutters 14 embedded in the base 13.
  • the cutters 14 form the tip 15 of the drill head 2.
  • the cutters 14 project in the direction of impact 9 with respect to the base 13 .
  • the end face 12 of the drill head 2 is made up of the end faces 16 of the cutting edges 14 pointing in the direction of impact 9 and the end faces 17 of the base 13 .
  • the base 13 has a cylindrical lateral surface 18.
  • the blades 14 protrude in the radial direction with respect to the lateral surface 18 .
  • the lateral surface 18 may be circumferentially closed below the cutting edges 14 .
  • a bottom 19 of the base 13 is disposed on the hollow shaft 4 .
  • the bottom 19 may be welded, soldered or connected in an analogous manner materially connected to the shaft 4 .
  • the drill head 2 by means of a screw, a bayonet lock or preferably a conical-pressing connection ( Fig. 6 ) may be connected to the shaft 4 .
  • the blades 14 are preferably made of a sintered tungsten carbide-containing material.
  • a the cutting edges 14 may circumferential portion 20 of the base 13 from the sintered tungsten-containing material and the bottom forming portion 21 be made from the sintered iron-based material ( Fig. 3 ).
  • the cutting edges 14 are arranged in a star shape around the drill axis 11 .
  • the cutting edges 14 are interconnected monolithically, in particular without joining zone by welding, soldering, terminals, etc. connected to each other.
  • the blades 14 are preferably sintered from a tungsten carbide-containing material.
  • the blades 14 are preferably regular or arranged in pairs around the drill axis 11 regularly.
  • the four identical cutting edges 14 are arranged at intervals of 90 degrees in the direction of rotation 10 .
  • the blades may be formed differently.
  • the drill head has major cutting edges and minor cutting edges.
  • the exemplary embodiment shows four blades 14; in other embodiments, the drill bit 2 may have three, five or six blades 14 .
  • the cutting edges 14 each have a chisel edge 22 projecting in the direction of impact 9 , which tapers in the radial direction onto a tip 15 of the drill head 2 .
  • the chisel edge 22 may be rectilinear or curved.
  • the chisel edges 22 are preferably identical or pairwise identical. In the illustrated embodiment, all chisel edges 22 extend to the top 15; in other embodiments, only chisel edges of the main cutting edges extend to the tip 15.
  • the single tip 15 of the drill head 2 is preferably located on the drill axis 11.
  • the pointing in the direction of impact 9 end face 16 of each blade 14 is formed by a rake face 23 and an open space 24 .
  • the rake face 23 and the flank face 24 are both facing in the direction of impact 9 and touching each other along the chisel edge 22.
  • the cutting face 23 and the flank face 24 are extended in the radial direction.
  • the rake surface 23 and the flank 24 extend from adjacent to the outer edge surface 25 to the drill axis 11 or in the vicinity of the drill axis 11.
  • the rake face 23 is in front of the free surface 24 in the usual direction of rotation 10 of the drill head 2 leading. Looking at the drill head 2 is the usual direction of rotation 10 counterclockwise.
  • the clamping surface 23 and the free surface 24 are inclined relative to the drill axis 11 .
  • the rake face 23 rises counter to the direction of rotation 10 in the direction of impact 9 ; the free surface 24 falls against the direction of rotation 10 in the direction of impact 9 from.
  • the rake surface 23 and the free surface 24 are therefore inclined to each other.
  • a roof angle 26 between the rake face 23 and the flank 24 is greater than 45 degrees, for example greater than 60 degrees and less than 120 degrees.
  • the roof angle 26 may be constant or changing in the radial direction.
  • edge surface 25 of the blades 14 is preferably oriented parallel to the drill axis 11 .
  • the edge surface 25 defines with its radial distance to the drill axis 11, the diameter 27 of the drill head 2.
  • the edge surface 25 forms a demolition edge 28 which rests against a borehole wall during drilling.
  • the breakaway edges 28 assist in forming a circular cylindrical shape of the wellbore by breaking off rock projecting radially into the wellbore.
  • the edge surface 25 is preferably in the radial direction with respect to the lateral surface 18 of the cylindrical base 13 in front.
  • the cutters 14 divide an upper portion of the lateral surface 18 into a plurality of cylindrical sectors.
  • a connected to the upper portion lower portion of the lateral surface 18 is preferably circumferentially closed, that is completely cylindrical.
  • the suction openings 3 may be arranged centrally between adjacent chisel edges 22 .
  • the suction openings 3 are preferably located in the end faces 17 of the base 13.
  • the suction openings 3 are circumferentially closed, for this purpose, the suction openings 3 are arranged at a distance from the lateral surface 18 .
  • a radial distance of the suction openings 3 is for example between 5% and 20% of the diameter of the drill head 2.
  • the suction openings 3 are arranged along the drill axis 11 offset from the chisel edges 22 .
  • the suction openings 3 are lower than the chisel edges 22 and thus do not influence or in negligible measure the chiseling functionality of the drill head 2.
  • An axial offset 29 of the suction openings 3 to the tip 15 is preferably greater than 15% of the diameter 27 of the drill . 1
  • an intake passage 30 connects the intake ports 3 from the end face 12 with the underside 19 of the drill head 2.
  • the predetermined flow direction 31 is from the suction ports 3 to the bottom 19, ie opposite to the direction of impact 9.
  • the intake passage 30 is transverse to the flow direction over the entire length closed.
  • the intake passage 30 extends completely within the base thirteenth
  • the suction channel 30 approaches along the flow direction 31 of the drill axis 11 at.
  • the approach is not rectilinear, but the intake passage 30 is at least partially curved.
  • An upper portion 32 of the intake duct 30 adjacent to the intake ports 3 is substantially parallel to the blades 14, ie to the drill axis 11.
  • the intake port 30 does not approach or only slightly approaches the blades 14 in the flow direction 31 .
  • An approximation of the intake duct 30 to the drill axis 11 in the upper portion 32 is preferably less than 5% of the diameter 27 of the drill 1.
  • the centroid in the cross sections perpendicular to the drill axis 11 can be used.
  • the upper portion 32 extends over at least 50%, eg 75%, of the height of the blades 14, preferably at least the entire height of the blades 14.
  • the upper portion 32 may be rectilinear or curved.
  • a lower portion 33 of the intake passage 30 adjacent to the hollow shaft 4 is inclined with respect to the blades 14 .
  • the lower portion 33 approaches toward the shank 4 progressively the drill axis 11 at.
  • the lower portion 33 of the intake duct 30 may be in the hollow with an inclination between 10 degrees and 30 degrees Run in shank 4 .
  • the suction channel 30 preferably approaches between 5% and 30% of the diameter 27 of the drill 1 to the drill axis 11 at.
  • the exemplary lower portion 33 is continuously curved.
  • the lower section can also be designed in a straight line.
  • a portion connecting the upper portion to the lower portion is correspondingly curved.
  • All curved sections of the intake duct 30 preferably have a radius of curvature greater than 80% of the diameter 27 of the drill 1.
  • the intake duct 30 has smooth inner walls over its entire length. The gentle curvatures with the large radii of curvature promote a smooth transport of the cuttings in the intake ducts 30. In particular, jamming or jamming of larger pieces of cuttings is avoided.
  • the suction openings 3 have an area fraction of 10% to 25% on the front side 12.
  • the high proportion is advantageous in order to ensure a removal of the cuttings.
  • the intake passage 30 may have a cross-section widening along the flow direction 31 .
  • the smallest cross section has the intake passage 30 at or near the intake port 3.
  • the change in the cross section reduces a tendency of the intake port 30 to clog.
  • the area of the cross section changes by at least 30%, preferably by more than 60%.
  • the area of the cross section is determined in planes perpendicular to the drill axis 11 .
  • the change preferably occurs entirely or mainly within the upper portion 32, ie at the level of the blades 14.
  • a radially outer wall of the intake ports 30 is preferably parallel to the drill axis 11, while a radially inner wall of the intake ports 30 approaches the drill shaft 11 , to get the cross-sectional widening.
  • the exemplary intake ports 3 are non-circular.
  • the suction openings 3 have a triangular shape. Corners of the intake ports 3 may be pointed or rounded. The sides connecting the corners can be straight or curved. Characterizing a triangle is a circle in the suction port 3 inscribed, which touches each of the three sides in exactly one point. Further, for a triangle, a distance between the center of the inscribed circle and the sides from the corners to the point touched by the circle continuously decreases.
  • a corner of the suction ports 3 faces the tip 15 of the drill bit 2.
  • An interior angle 34 at the corner preferably corresponds approximately to the angular distance between the adjacent blades 14, eg 90 degrees. Approximately in this context describes a deviation of less than 20%.
  • the surface area of the suction openings 3 is significantly larger than the surface area of the inscribed circle. The surface area of the suction openings 3 is larger by at least 30%, for example at least 100% larger.
  • the hollow shaft 4 has has a along the drill axis 11 extending conveyor channel 35.
  • the conveyor channel 35 has a constant cross section over the length of the shaft 4.
  • a surface area of the cross section of the conveyor channel 35 is preferably equal to the sum of the sections of the intake ports 30.
  • the conveyor channel 35 For example, an area ratio of 15% to 65% at the cross section of the shaft 4.
  • the conveyor channel 35 may be centrally located on the drill axis 11 .
  • the delivery channel 35 ends below the drill head 2, in particular below the base 13.
  • the end of the delivery channel 35 is preferably rounded dome-shaped.
  • the suction channels 30 from the drill head 2 open into the delivery channel 35 of the hollow shaft 4.
  • the junction is at or near one end of the delivery channel 35.
  • the surfaces at the junction are rounded.
  • the suction connection 5 contains a radial puncture 36 in the delivery channel 35.
  • the sleeve 8 encloses, preferably airtight, the cylindrical shaft in the region of the puncture 36.
  • the sleeve 8 is rotatable relative to the shaft 4 .
  • the exemplary male end 6 of the drill 1 is designed for the use of rotary chiseling hand tool machines.
  • the spigot 6 has a substantially cylindrical shape.
  • the spigot 6 has two closed grooves 37, in which locking elements of the power tool radially engage and can slide along the drill axis 11 .
  • longitudinally aligned grooves 38 allow the introduction of torque from the power tool.
  • the drill 1 is preferably made of different materials.
  • the shank 4 and the insertion end 6 are preferably made of a tough and ductile steel.
  • the cutting edges 14 of the drill head 2 are made of very hard and abrasion-resistant sintered tungsten carbide.
  • the tungsten carbide has a volume fraction of at least 70% by volume.
  • the metallic binder preferably contains one or more of the metals: cobalt and nickel.
  • the binder can be made entirely of cobalt.
  • the drill head 2 can not be produced in a conventional manner in a master mold, which is subsequently machined to form the intake passages 30 .
  • a manufacturing method is proposed, with which the desired intake ports 30 molds.
  • the manufacturing method described can be modified in details, without departing from its principle.
  • a thin powder layer is prepared by spraying a suspension with tungsten carbide and the metallic binder.
  • An adhesive is printed on the powder layer structured. The adhesive traces a cross section through the drill head 2 . The deposition of a powder layer and the adhesive is repeated until a blank of the drill head 2 is replicated.
  • the excess powder, especially in the suction channels 30, can be removed by water. The water penetrates between the non-adhesive layers and breaks them up. The resulting blank now corresponds to the shape of the drill head 2.
  • the green compact can be sintered.
  • the problem in the production of the drill head 2 is based on the high mechanical requirement of the drill head 2, which allows only a very low porosity.
  • a necessary density of the drill head 2 must be greater than 98% of the theoretically achievable value.
  • the green body must have a density of at least 50% of the theoretical density before sintering.
  • the sintering is accompanied by a typical shrinking, which closes the pores sufficiently from this value.
  • Conventional methods of compacting the green compact in a mold achieve these values.
  • a promising approach is based on a tungsten carbide / cobalt oxide powder mixture.
  • the cobalt oxide is converted to cobalt after forming the green compact.
  • the suspension contains as liquid water or alcohol, preferably isopropyl alcohol.
  • the ratio of liquid to powder is in the range of 3 to 5 to 1.
  • the suspension can be sprayed evenly under pressure through a thin nozzle. After spraying, the layer is dried at slightly above room temperature.
  • the layers have a uniform thickness in the range between 20 microns and 30 microns.
  • the adhesive is based on an aqueous solution of polyethyleneimine. Polyethyleneimine shows a very high affinity to bind to the grains of tungsten carbide. As a result, a good bonding is achieved.
  • the weight fraction of polyethylenimine in the solution can range between 1% and 5%.
  • the adhesive is dried at slightly above room temperature. After application of the last layer, the adhesive is cured in an oven at about 150 degrees Celsius (° C). Subsequently, the excess powder is removed by water. The cobalt oxide in the green body is converted to cobalt by the green body in a Hydrogen-containing atmosphere is kept at 600 ° C to 700 ° C for several hours. Finally, the green compact can be sintered at a temperature between 1250 ° C and 1400 ° C.
  • the iron-containing lower portion 21 of the base 13 can also be made over a three-dimensional shape.
  • a green compact can also be printed and then sintered.
  • processes such as laser deposition welding, selective laser melting (SLM) or selective laser sintering (SLS) are also possible for the production of steel bodies.
  • the cutting edges 14 are cross-shaped, as in the embodiment of Fig. 2 ,
  • the blades 14 are preferably sintered from tungsten carbide.
  • the pedestal 40 has an upper portion 41 and a lower portion 42 as in the previous embodiment .
  • the difference with the previous embodiment is that the pedestal 40 is formed of a material.
  • the upper portion 41 is also formed in this case of a ferrous material.
  • the upper portion 41 has a cross-shaped slot in which the blades 14 are inserted.
  • the end face 12 of the drill head 2 is thereby made of the hard cutting edges 14 and the end face 43 of the relatively softer base 40.
  • the cutting edges 14 may be soldered or welded to the base 40 .
  • the intake ports 30 are closed in the upper portion 41 of the base 13.
  • the intake ports 30 are spaced from both the periphery of the drill head 2 and the blades 14 .
  • the course of the channels and their further properties may correspond to the previous embodiment.
  • the drill bit 44 also has a socket 40 and four blades 14.
  • the socket 40 and blades 14 may be shaped as in any of the previous embodiments.
  • the suction openings 3 are arranged on base 40 , the suction channels 30 extend in the base 40 analogous to the preceding embodiments.
  • the hollow shaft 45 has a delivery channel 46 and a core 47.
  • the core 47 is a rod-shaped solid structure which lies on the drill axis 11 . A blow to the striking surface 7 is transmitted via the soul 47 on the cutting 14 .
  • the delivery channel 46 may, for example, surround the core 47 in a ring shape ( Fig. 9 ).
  • the suction channels 30 open into the delivery channel 46.
  • the core 47 can be supported by struts 48 on the outer shell of the shaft 4 (FIG. Fig. 10 ).
  • the struts 48 may be the delivery channel 46 subdivided into several channels, for example, each intake channel 30, a delivery channel 35 48 assigned.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
EP17178102.4A 2017-06-27 2017-06-27 Bohrer für die meisselnde bearbeitung von gestein Withdrawn EP3421205A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP17178102.4A EP3421205A1 (de) 2017-06-27 2017-06-27 Bohrer für die meisselnde bearbeitung von gestein
US16/626,184 US11850716B2 (en) 2017-06-27 2018-06-19 Drill for chiselling rock
PCT/EP2018/066259 WO2019002025A1 (de) 2017-06-27 2018-06-19 Bohrer für die meisselnde bearbeitung von gestein
JP2019572094A JP6925456B2 (ja) 2017-06-27 2018-06-19 岩石のチゼル加工用のドリル
EP18731458.8A EP3645229B1 (de) 2017-06-27 2018-06-19 Bohrer für die meisselnde bearbeitung von gestein
CN201880042833.0A CN110799316B (zh) 2017-06-27 2018-06-19 用于以凿钻方式加工岩石的钻头

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17178102.4A EP3421205A1 (de) 2017-06-27 2017-06-27 Bohrer für die meisselnde bearbeitung von gestein

Publications (1)

Publication Number Publication Date
EP3421205A1 true EP3421205A1 (de) 2019-01-02

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP17178102.4A Withdrawn EP3421205A1 (de) 2017-06-27 2017-06-27 Bohrer für die meisselnde bearbeitung von gestein
EP18731458.8A Active EP3645229B1 (de) 2017-06-27 2018-06-19 Bohrer für die meisselnde bearbeitung von gestein

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP18731458.8A Active EP3645229B1 (de) 2017-06-27 2018-06-19 Bohrer für die meisselnde bearbeitung von gestein

Country Status (5)

Country Link
US (1) US11850716B2 (zh)
EP (2) EP3421205A1 (zh)
JP (1) JP6925456B2 (zh)
CN (1) CN110799316B (zh)
WO (1) WO2019002025A1 (zh)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3421163A1 (de) * 2017-06-27 2019-01-02 HILTI Aktiengesellschaft Bohrer für die meisselnde bearbeitung von gestein
CN111113554A (zh) * 2020-01-03 2020-05-08 西南石油大学 一种用于碳纤维复合材料制孔的吸气式钻头
KR102397373B1 (ko) * 2021-11-01 2022-05-13 서울화스닝(주) 천정 앵커볼트 시공과 전산볼트 설치용 치공구 세트 및 이를 이용한 전산볼트 시공방법

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Publication number Priority date Publication date Assignee Title
US3163246A (en) * 1963-04-18 1964-12-29 Westinghouse Air Brake Co Rock drill bit
EP0941793A2 (de) * 1998-03-10 1999-09-15 HILTI Aktiengesellschaft Bohrwerkzeug
WO2001061142A1 (en) * 2000-02-15 2001-08-23 Kennametal Inc. Drill bit, hard member, and bit body

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US11850716B2 (en) 2023-12-26
EP3645229B1 (de) 2021-07-28
CN110799316A (zh) 2020-02-14
WO2019002025A1 (de) 2019-01-03
JP2020525678A (ja) 2020-08-27
EP3645229A1 (de) 2020-05-06
CN110799316B (zh) 2021-12-21
US20200215674A1 (en) 2020-07-09

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