EP3237165A1 - Procédé de fabrication d'une bague de carottage pour couronne de carottage - Google Patents

Procédé de fabrication d'une bague de carottage pour couronne de carottage

Info

Publication number
EP3237165A1
EP3237165A1 EP15817333.6A EP15817333A EP3237165A1 EP 3237165 A1 EP3237165 A1 EP 3237165A1 EP 15817333 A EP15817333 A EP 15817333A EP 3237165 A1 EP3237165 A1 EP 3237165A1
Authority
EP
European Patent Office
Prior art keywords
ring
drill
ring sections
green parts
layers
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Withdrawn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
EP15817333.6A
Other languages
German (de)
English (en)
Inventor
Matthias Mueller
Marcel Sonderegger
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
Publication of EP3237165A1 publication Critical patent/EP3237165A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/18—Sawing tools of special type, e.g. wire saw strands, saw blades or saw wire equipped with diamonds or other abrasive particles in selected individual positions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • 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
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/12—Saw-blades or saw-discs specially adapted for working stone
    • B28D1/121—Circular saw blades

Definitions

  • the present invention relates to a method for producing a closed drill ring for a core bit according to the preamble of claim 1.
  • Core bits consist of a machining section, a cylindrical drill shaft and a receiving section with insertion end.
  • the core bit is fastened via the insertion end in the tool holder of a core drilling machine and driven in drilling operation by the core drilling machine about an axis of rotation.
  • Closed drill rings are manufactured from a powder mixture with randomly distributed diamond particles. The powder mixture is filled into a mold and pressed into a green part; the green part is sintered under temperature and pressure to form a closed drill ring.
  • US 5,316,416 discloses the construction of closed drilling rings, which have good removal properties over the entire height of the drill ring.
  • the drill rings have a plurality of upper slots and lower slots distributed along the circumferential direction of the drill rings.
  • the upper slots extend over half the height of the drill rings and open into the drilling shaft facing away from the processing surface of the drill rings.
  • the lower slots are respectively arranged between the upper slots along the circumferential direction of the drill rings and open into the attachment surface of the drill rings facing the drill shaft.
  • the upper and lower slots overlap in the height of the drill rings. The distribution of the upper and lower slots over the entire height of the drill rings, a cooling and rinsing fluid is transported over the entire service life of the drill ring to the processing site and removed material is removed from the drilling area.
  • a green part is built up in layers from powder layers containing a powder mixture and diamond layers with diamond particles, which are arranged in a setting pattern, and then sintered under temperature and pressure to the cutting segment.
  • the cutting segments are arranged along a circumferential direction of the cylindrical drill shank and welded to the drill shank, soldered and fastened in some other way.
  • the cutting speed achievable with a segmented core bit depends largely on the arrangement of the diamonds in the cutting segment. With the layered structure, the arrangement of the diamond particles can be influenced by the number of diamond layers, the distance between the diamond layers and the size of the diamond particles.
  • the object of the present invention is to apply the technology of the set diamonds to closed drill rings and to increase the machining quality achievable with the drill rings thus produced.
  • This object is achieved in the aforementioned method for producing a closed drill ring for a core bit according to the invention by the features of independent claim 1.
  • Advantageous developments are specified in the dependent claims.
  • the method according to the invention for producing a closed drill ring comprises the steps:
  • ⁇ at least two green parts are built up in layers in a construction direction by successive application of powder layers of a powder mixture and diamond layers with diamond particles, which are arranged in a setting pattern, between a bottom side and a top side,
  • the sintered ring sections are assembled in a ring and connected to the side edges by a positive or material fit to a closed drill ring.
  • the method according to the invention comprises a plurality of method sections which use different technologies.
  • the term "powder mixture” includes fine-grained powder mixtures and granulated powder mixtures; the use of granular Herten powder mixtures is a prerequisite for volumetric cold pressing.
  • a powder mixture iron, cobalt and / or bronze powders can be used;
  • additives such as tungsten carbide
  • the properties of the drill rings wear resistance, durability, cutting ability
  • the composition of the powder mixture has an influence on the sintering temperature.
  • diamond particles is taken to mean individual diamond particles as well as coated or coated diamond particles.
  • the green parts have, according to the layered structure on the geometric shape of a straight prism with a polygonal base.
  • the prismatic green parts are formed in the second process section under pressure to form ring sections.
  • the forming of the green parts takes place at temperatures which are below the melting temperature of the powder mixture.
  • Cold forming, hot pressing and similar processes are suitable as forming processes.
  • cold pressing a green part is brought under a high pressure in the predetermined shape.
  • a cold press the material is indeed heated, but the transformation takes place in a temperature range in which no recrystallization occurs; The material deforms without the strength decreasing significantly.
  • hot pressing which is also referred to as drop forging, a green part is brought under its high pressure and the addition of heat in its final form. In addition to the shape, the forging changes its material structure; it gets stronger and thus gets a denser texture and a homogeneous surface.
  • the ring sections are sintered under the influence of temperature; During sintering, a compression of the individual ring sections takes place.
  • the sintered ring sections are assembled in a ring and connected to the side edges non-positively or cohesively to a closed drill ring.
  • a method for non-positive or cohesive connection of the side edges are all common connection methods, such as welding, soldering, gluing and comparable connection methods.
  • Sintering is a process for the production of materials in which a powder or a green part (pressed powder) are heated to temperatures below the melting temperature in order to increase the strength by bonding the individual powder particles.
  • the sintering process takes place in three stages, in which the porosity and the volume of the green part are significantly reduced. In the first stage of sintering, only a densification of the green part takes place, whereas in the second stage the open porosity is significantly reduced.
  • the strength of the sintered bodies is based on the sintered compounds formed in the third stage (deposits between the powder particles), which are produced by surface diffusion between the powder particles.
  • the drill ring is not constructed in the method according to the invention as a closed drill ring, but is composed of two or more ring sections, which are non-positively or materially connected to one another at the side edges.
  • Cutting segments used for segmented core drill bits are used for segmented core drill bits.
  • the ring sections are subjected to a temperature and pressure effect during sintering.
  • the forming of the green parts into ring sections and the subsequent sintering of the ring sections can be carried out in a common method step.
  • Hot pressing is a special sintering process that uses external pressure in addition to temperature.
  • the green parts are simultaneously formed in a hot press by pressure and sintered by the action of temperature.
  • sintering processes with temperature and pressure, such as hot pressing the sintering proceeds faster and at a lower temperature than in sintering without pressure, such as free sintering. Since thermal diamond damage already occurs at 600 ° C, a lower sintering temperature can be a qualitative advantage.
  • the ring sections are subjected to an additional external shaping by the pressure effect during sintering.
  • special roof forms have proven to be suitable. These roof shapes can be generated by pressure during sintering.
  • the drill ring is constructed from a number of n, n> 1 first green parts, which are formed into first ring sections, and n second green sections, which are formed into second ring sections, wherein the first and second ring sections along a Circumferential direction of the drill ring are arranged alternately one behind the other.
  • the production of the drill ring from the first and second green parts makes it possible to adapt the drill ring to different substrates to be machined. For example, in core drilling in concrete materials with embedded reinforcing bars, which are also referred to as reinforced concrete materials, a drill ring encounters different substrates in the form of concrete and reinforcing bars.
  • the first ring sections are particularly preferably constructed from a first powder mixture and first diamond particles
  • the second ring sections are constructed from a second powder mixture and second diamond particles.
  • the adjustment of the drill ring to the substrate to be processed can be done by selecting the powder mixture and the choice of diamond particles. With the powder mixture, the composition of the materials can be varied; For the diamond particles, the mean diamond diameter, the diamant distribution and the number of diamond particles can be varied.
  • the drill ring is constructed from a number of 2n, n> 1 equal green parts, n green parts under pressure with a convex curvature to first ring sections and n green parts under pressure with a concave curvature to second ring sections are formed. Through the use of the same green parts, the expenditure on equipment in the layered structure of the green parts can be reduced; only one powder mixture and one kind of diamond particles are needed.
  • the upper side of the green parts is arranged at the first ring sections on the outside and at the second ring sections on the inside, wherein the first and second ring sections are arranged alternately one behind the other along a circumferential direction of the drill ring. Due to the different curvature of the ring sections two different ring sections can be made from the same green parts.
  • the green parts have on the upper side a diamond layer which is arranged at the first annular sections on the outer lateral surface and in the second annular sections on the inner lateral surface.
  • the number of diamond layers and the size of the diamond particles are adjusted so that the average diamond diameter of the diamond particles is at least 45% of the quotient of drill ring width and number of diamond layers.
  • the circular removal paths that describe the diamond particles during processing as close as possible to each other and the reinforcing bars are almost completely removed from the diamond particles.
  • the number of removal paths that produce the diamond particles during machining can be doubled by the alternating arrangement with the same number of diamond particles.
  • the green parts have, according to the layered structure on the geometric shape of a straight prism with a polygonal base. As polygonal bases are rectangular bases, pentagonal bases and hexagonal bases.
  • the green parts are built up from powder layers with rectangular bases.
  • the rectangular base is the simplest geometry to make drill rings from multiple ring sections.
  • the ring sections are connected at the side edges with the adjacent ring sections.
  • the green parts are built up from powder layers with pentagonal bases, wherein the bases have a rectangle and a trapezoid with two right interior angles.
  • the area of the inclined trapezoid leg is sintered with the adjacent ring section creates a water slot.
  • a number of n water slots is produced in a drill ring with 2n, n> 1 ring sections.
  • the green parts are made up of powder layers with hexagonal bases, the bases having a rectangle and an isosceles trapezium.
  • the base In the area of the inclined trapezoidal legs, water slots are created during sintering with the adjacent ring sections.
  • a number of n water slots is produced in a drill ring with n, n> 2 ring sections.
  • the height of the trapezoid is set between 1/3 and 5/6 of the total height of the green part.
  • the connection area is set up without diamonds and is unsuitable for machining.
  • the matrix zone provided with diamond particles which represents approximately 5/6 of the total height of the green part, is suitable.
  • the height of the trapezoid is set to 2/3 of the total height of the green part. With a share of 2/3 of the total height sufficient strength of the finished drill ring can be ensured.
  • coolant must be transported to the processing site; Therefore, the water slots are formed in the drill ring as long as possible.
  • FIG. 1 a core bit consisting of a drill ring, a cylindrical
  • FIGS. 2A-C show a first embodiment of a drill ring according to the invention, which is constructed from four ring sections, in a three-dimensional representation (FIG. 2A), in a cross section perpendicular to the cylinder axis of the drill ring
  • FIG.2B and in a detail enlargement (FIG.2C);
  • FIG. 3 shows a second embodiment of a drill ring according to the invention, which is constructed from four ring sections with water slots;
  • FIGS. 4A-C show the manufacture of the drill ring of FIG. 4, wherein two green parts are formed into and become sintered into concave first ring sections and two green parts are formed into convex second ring sections (FIG. 4B) and the sintered ring sections are alternately arranged one behind the other along a circumferential direction and be connected to a closed drill ring at the side edges by force or material engagement (FIG. 4C); and
  • FIGS. 5A-C green parts with a rectangular base (FIG.5A), a pentagonal one
  • FIG. 1 shows a core bit 10 with a drill ring 11, a cylindrical drill shaft 12 and a receiving section 13 with insertion end 14.
  • the core bit 10 is fastened via the insertion end 14 in the tool receptacle of a core drilling device and driven by the core drilling device in a rotational direction 15 about a rotation axis 16 during drilling operation , wherein the axis of rotation 16 is coaxial with the cylinder axis of the core bit 10.
  • FIGS. 2A-C show a first embodiment of a drill ring 21 according to the invention, which is composed of a plurality of ring sections and the drill ring 1 1 of the core bit 10 of FIG. 1 can replace.
  • FIG. 2A shows the drill ring 21 in a three-dimensional representation
  • FIG. 2B shows the drill ring 21 in a cross section perpendicular to the axis of rotation 16
  • FIG. 2C shows a section from the cross section of FIG. 2B in the connection area between two ring sections.
  • the drill ring 21 is composed of four ring sections which are connected to one another at the side edges and form a closed ring in the circumferential direction (FIG. 2A).
  • the ring sections of the drill ring 21 can be divided into two first ring sections 22.1, 22.2 and two second ring sections 23.1, 23.2, which are arranged alternately one after the other along the circumferential direction of the drill ring 21.
  • the first ring sections 22.1, 22.2 consist of a first powder mixture 24 and first diamond particles 25
  • the second ring sections 23.1, 23.2 consist of a second powder mixture 26 and second diamond particles 27 (FIG. 2B).
  • FIG. FIG. 2C shows a detail from the cross section of FIG.
  • the first ring section 22. 1 is constructed from a number of ITH powder layers of the first powder mixture 24 and with diamond layers of the first diamond particles 25.
  • the second ring section 23.1 is made up of a number of m 2 powder layers of the second powder mixture 26 and m 2 diamond layers of the second diamond particles 27.
  • the selection of the materials for the first and second powder mixtures 24, 26, the selection of the diamond distribution and size for the first and second diamond particles 25, 27 and the number m- ⁇ , m 2 of the diamond layers and Abtragbahnen allow the adjustment of the drill ring 21 at different substrates to be worked on.
  • the ring sections 22.1, 22.2, 23.1, 23.2 are constructed in layers of three powder layers and three diamond layers.
  • the powder mixture is filled in a die and forms the first powder layer.
  • the diamond particles are in one Setzmuster placed as a first diamond layer on or in the first powder layer.
  • an intermediate pressing can take place after the diamond particles have been placed.
  • the powder mixture is filled in the die and forms the second powder layer.
  • the diamond particles are placed in a setting pattern as a second diamond layer on or in the second powder layer. This process is repeated until the desired construction height of the green part is reached.
  • the last layer is a diamond layer.
  • FIG. 3 shows a second embodiment of a drill ring 51 according to the invention, which consists of four ring sections and can replace the drill ring 1 1 of the core bit 10. Between the ring sections four water slots 52.1, 52.2, 52.3, 52.4 are formed, via which a cooling liquid is transported to the processing site.
  • the ring sections are arranged so that the drill ring 51 on the inside 53 and on the outside 54 alternately has a diamond-studded area 55 and a diamond-free area 56.
  • the water slots 52.1 -52.4 extend over a height of about 2/3 of the total height of the drill ring 51. To ensure the functionality of the drill ring 51, when the water slots 52.1 -52.4 are removed, two ring sections have a bore 57.1, 57.2 on the cooling liquid is transported to the processing site.
  • FIGS. 4A-C show the production of the drill ring 51 from four identical green parts 61 with a hexagonal base (FIG. 4A).
  • Two green parts 61 are formed into concave first ring sections 62 and two green parts 61 are formed into convex second ring sections 63 and sintered (FIG.4B).
  • the sintered first and second ring sections 62, 63 are assembled in an annular manner and are connected to the side edges in a force-fit or material-locking manner to form a closed drill ring 51 (FIG. 4C).
  • FIG. FIG. 4A shows the structure of the green part 61 which has been formed in layers of powder layers of a powder mixture 64 and diamond layers of diamond particles 65.
  • the green part 61 consists of a connection region 66, which is also referred to as a foot zone, and a processing region 67, which is also referred to as a matrix zone.
  • the connection region 66 and the processing region 67 can be built together in layers, with no diamond particles 65 being set in the connection region.
  • the connection area can be produced as a separate area and connected to the processing area during sintering.
  • the base of the green parts 61 is hexagonal and consists of a rectangle 68 and an adjacent isosceles trapezium 69, wherein the connection region 66 of the green part 61 is in the rectangle 68.
  • the water slots 52.1 -52.4 is transported via the cooling liquid to the processing site.
  • the height h of the trapezoid 69 in the green part determines the height of the water slots 52.1 -52.4.
  • the height h of the trapezoid 69 corresponds to half the total height H of the green part 61.
  • FIG. 4B shows the first ring portion 62 formed from the green portion 61 of FIG.
  • the top side of the green part 61 which is formed as a diamond layer, is arranged on the outside 54 and the second ring section 63 has the top side of the green part 61 on the inside 53.
  • the sintered first ring portion 62 has first and second side edges 71, 72 joined to first and second side edges 73, 74 of the sintered second ring portion 63.
  • the first side edge 71 of the first ring section 62 is connected to the second side edge 74 of the second ring section 63 and the second side edge 72 of the first ring section 62 is connected to the first side edge 73 of the second ring section 63.
  • FIG. 4C shows the first ring sections 62.1, 62.2 and second ring sections 63.1, 63.2, which are arranged alternately one behind the other along a circumferential direction of the drill ring 51 and are connected to one another in a force-locking or material-locking manner on the side edges.
  • the ring sections 62.1, 63.1, 62.2, 63.2 form a closed drill ring.
  • a drill ring is constructed in the process of the invention from several green parts, which are formed into ring sections and sintered into a closed drill ring; polygonal bases are suitable as geometry for the green parts.
  • FIG. 5A-C show green parts 81 having a rectangular base (FIG.5A), green parts 82 having a pentagonal base (FIG.5B), and green parts 83 having a hexagonal base (FIG.5C).
  • the rectangular base 84 of the green parts 81 represents the simplest geometry to produce drill rings of several ring sections.
  • three equal green parts 81.1, 81 .2, 81 .3 are used to make a closed drill ring.
  • the pentagonal base of the green parts 82 can be divided into a rectangle 85 and a trapezoid 86 with two right interior angles. In the area of the inclined trapezoid leg, a water slot 87 is produced during sintering with the adjacent ring section.
  • a number of n water slots 87 are produced in a drill ring with 2n, n> 1 ring sections.
  • the hexagonal base of the green parts 83 can be divided into a rectangle 88 and an isosceles trapezium 89. In the region of the inclined trapezoidal legs water slots 90 are generated during sintering with the adjacent ring sections. With such a hexagonal base area, a number of n water slots 90 are generated in a drill ring with n, n> 2 ring sections.

Abstract

L'invention concerne un procédé pour produire une bague de carottage (21) pour une couronne de carottage, qui comprend les étapes suivantes : au moins deux compacts verts sont agencés en couches entre une face inférieure et une face supérieure dans une direction de configuration, par application successive de couches d'un mélange pulvérulent et de couches de diamant comportant des particules de diamant, qui sont disposées en un motif de positionnement, les compacts verts sont façonnés en segments de bague (62.1, 62.2, 63.1, 63.2) sous l'effet de pression et les segments de bague (62.1, 62.2, 63.1, 63.2) sont assemblés sous forme d'anneau et solidarisés à force ou par liaison de matière, de sorte à former une bague de carottage (51) fermée.
EP15817333.6A 2014-12-22 2015-12-22 Procédé de fabrication d'une bague de carottage pour couronne de carottage Withdrawn EP3237165A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14199721.3A EP3037230A1 (fr) 2014-12-22 2014-12-22 Procédé de fabrication d'une bague de forage fermée pour une couronne de carottage
PCT/EP2015/080903 WO2016102525A1 (fr) 2014-12-22 2015-12-22 Procédé de fabrication d'une bague de carottage pour couronne de carottage

Publications (1)

Publication Number Publication Date
EP3237165A1 true EP3237165A1 (fr) 2017-11-01

Family

ID=52134022

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14199721.3A Withdrawn EP3037230A1 (fr) 2014-12-22 2014-12-22 Procédé de fabrication d'une bague de forage fermée pour une couronne de carottage
EP15817333.6A Withdrawn EP3237165A1 (fr) 2014-12-22 2015-12-22 Procédé de fabrication d'une bague de carottage pour couronne de carottage

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14199721.3A Withdrawn EP3037230A1 (fr) 2014-12-22 2014-12-22 Procédé de fabrication d'une bague de forage fermée pour une couronne de carottage

Country Status (7)

Country Link
US (1) US20170368714A1 (fr)
EP (2) EP3037230A1 (fr)
KR (1) KR20170095391A (fr)
CN (1) CN107107379A (fr)
AU (1) AU2015371100A1 (fr)
RU (1) RU2017126254A (fr)
WO (1) WO2016102525A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP3437761A1 (fr) * 2017-08-01 2019-02-06 HILTI Aktiengesellschaft Procédé de fabrication d'un segment opératoire pour un petit outillage abrasif
EP3670036A1 (fr) * 2018-12-21 2020-06-24 Hilti Aktiengesellschaft Procédé de fabrication d'un segment de traitement pour le traitement à sec de matériaux de béton
EP3670041A1 (fr) * 2018-12-21 2020-06-24 Hilti Aktiengesellschaft Procédé de fabrication d'un segment de traitement pour le traitement à sec de matériaux de béton
WO2020128086A1 (fr) * 2018-12-21 2020-06-25 Hilti Aktiengesellschaft Procédé pour fabriquer une ébauche crue et procédé pour transformer l'ébauche crue en segment d'usinage pour l'usinage à sec de matériaux de béton
CN113927253B (zh) * 2021-11-10 2022-08-26 中国航发南方工业有限公司 多孔精密旋转件加工方法

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JPH0818327B2 (ja) * 1992-03-02 1996-02-28 ラサ工業株式会社 コアドリル
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KR100527395B1 (ko) * 2003-08-11 2005-11-09 이화다이아몬드공업 주식회사 다이아몬드 공구
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Also Published As

Publication number Publication date
AU2015371100A1 (en) 2017-07-13
CN107107379A (zh) 2017-08-29
RU2017126254A3 (fr) 2019-01-25
US20170368714A1 (en) 2017-12-28
RU2017126254A (ru) 2019-01-25
KR20170095391A (ko) 2017-08-22
EP3037230A1 (fr) 2016-06-29
WO2016102525A1 (fr) 2016-06-30

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