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WO2019086169A1 - Outil de forage - Google Patents

Outil de forage Download PDF

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Publication number
WO2019086169A1
WO2019086169A1 PCT/EP2018/075735 EP2018075735W WO2019086169A1 WO 2019086169 A1 WO2019086169 A1 WO 2019086169A1 EP 2018075735 W EP2018075735 W EP 2018075735W WO 2019086169 A1 WO2019086169 A1 WO 2019086169A1
Authority
WO
WIPO (PCT)
Prior art keywords
drilling tool
drill head
cutting
shaft
tool according
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/EP2018/075735
Other languages
German (de)
English (en)
Inventor
Stefan Sonntag
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to CN201880071168.8A priority Critical patent/CN111295262B/zh
Publication of WO2019086169A1 publication Critical patent/WO2019086169A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B23B51/0486—Drills for trepanning with lubricating or cooling equipment
    • B23B51/0493—Drills for trepanning with lubricating or cooling equipment with exchangeable cutting inserts, e.g. able to be clamped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/40—Flutes, i.e. chip conveying grooves
    • B23B2251/406—Flutes, i.e. chip conveying grooves of special form not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts
    • B23B2251/505—Drilling tools comprising cutting inserts set at different heights
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/68—Drills with provision for suction

Definitions

  • a drilling tool which is suitable for dust-free drilling.
  • the drilling tool has a shaft with a bore, whose rear end is connected via connecting means with a pressure sink.
  • the front end of the bore opens via a reduced cross-section bore at a tapered end face of the drill head of the drilling tool.
  • the end face of the drill head has sectors divided by the cutting elements, one sector having the mouth of the bore and another sector having a channel configured as a fresh air feed.
  • the invention relates to a drilling tool which extends along a longitudinal axis, comprising a drill head, a connection area for connecting the drilling tool with a suction device, a shank area which is arranged between the drill head and the connection area and at least one transport channel which extends along the shaft area , It is proposed that the drilling tool has at least one inflow channel which differs from the transport channel and which is formed as a recess in the shank region and / or in the drill head. Advantageously, this improves the air flow in the region of the drill head.
  • the drilling tool is designed in particular as a rock drill, which is provided for a hammer drill.
  • the drilling tool advantageously has a plug-in end which is intended for coupling to a hand-held power tool, such as a hammer drill or a ner impact drill is formed.
  • a hand-held power tool such as a hammer drill or a ner impact drill is formed.
  • the drilling tool is designed in the region of the insertion end such that the drilling tool can be coupled to a tool receptacle of the hand tool machine.
  • the drilling tool can have form-locking elements designed as special grooves, which have an SDS-plus interface or a
  • the drilling tool For machining a workpiece, the drilling tool is set by means of the hammer drill in a rotating and linear oscillating or beating state.
  • the drilling tool penetrates into the workpiece during machining in the feed direction of the drilling tool.
  • the feed direction of the drilling tool runs coaxially to the longitudinal axis and from the insertion end in the direction of the drill head.
  • the longitudinal axis of the drilling tool corresponds in particular to a working or rotational axis of the drilling tool.
  • a drill head is to be understood as meaning, in particular, a region of the drilling tool which has at least one cutting body.
  • the cutting body has at least one cutting element, which may be formed as a main cutting element or as a secondary cutting element.
  • the cutting elements are formed in particular from a hard metal.
  • the cutting elements have a higher hardness than the shaft element.
  • Each cutting element has at least one cutting edge.
  • the cutting edge corresponds to the cutting line of a chip surface and an open surface of the cutting element.
  • each cutting element has a single cutting edge.
  • the cutting element may also have a plurality of cutting edges, which merge in particular.
  • the drill head may comprise a portion of the transport channel, wherein the portion of the transport channel of the drill head preferably has a different from the transport channel in the shaft region flow parameters.
  • the flow parameter may be, for example, a flow cross-section, a flow velocity, a flow direction with respect to the longitudinal axis or the like.
  • the transport channel is in particular designed to transport a fluid, preferably an air stream, within the drilling tool.
  • the transport channel may extend centrally in the shaft region and thus coaxially with the longitudinal axis of the drilling tool. Additionally or alternatively, it is also conceivable that the transport channel extends eccentrically in the shaft region and thus in particular spaced from the longitudinal axis.
  • the transport channel can be used, for example, as centric or ex- be formed central bore in the shaft member.
  • the drilling tool is formed at least in two parts in the shaft region, and the transport channel is arranged radially between the shaft element and a sleeve element or cover element closing the transport channel.
  • the shaft element has at least one radially outer groove which extends in a straight line and parallel to the longitudinal axis or spirally around the longitudinal axis.
  • the groove can be individually closed radially by a respective cover.
  • the groove can also be covered by a single sleeve element, wherein in particular a plurality of external grooves can be closed radially by the sleeve member.
  • the sleeve member is formed as a tubular and elongate sheath disposed about the shaft member.
  • the shaft element and the sleeve element extend substantially parallel to one another in the shaft region.
  • the sleeve member may be closed or partially open.
  • a closed sleeve element should be understood to mean a sleeve element which completely surrounds the shaft element at least in the shaft region.
  • a partially open sleeve element is to be understood as a sleeve element which surrounds the shaft element in the shaft region in the circumferential direction by at least 180 °.
  • a lateral surface of the sleeve element can be flat, with a uniform radial distance to the longitudinal axis or uneven with a non-uniform, in particular periodically varying radial distance from the longitudinal axis.
  • the sleeve element may consist of a metallic material or of a plastic-containing material.
  • the shaft member and the sleeve member made of the same material to the
  • the shaft element and the sleeve element are formed from different materials, in particular different metallic materials, preferably metallic and plastics-containing materials.
  • the transport channel is preferably provided for the extraction of cuttings within a borehole during a drilling operation.
  • the drill cuttings are preferably transported counter to the feed direction of the drilling tool.
  • the transport channel is formed substantially closed in the circumferential direction.
  • the inflow channel is in particular designed to guide a fluid in the direction of advance of the drilling tool to the drill head.
  • the inflow channel is preferably in circumferential partly closed or open.
  • the recess forming the inflow channel is arranged between an envelope circumscribing the shank region and / or the drill head and a lateral surface of the shank region and / or of the drill head.
  • the transport channel has a suction opening and a suction opening, whose distance corresponds to the length of the transport channel.
  • the drill cuttings can enter the transport channel via the intake opening.
  • the drill head comprises at least one suction opening.
  • the suction openings may have a cylindrical cross-section. It is also conceivable that the suction openings have a cross section adapted to the transport channel, which is formed substantially congruent with the cross section of the transport channel.
  • the suction opening and the suction opening can be arranged substantially parallel to one another, preferably substantially perpendicular to one another.
  • the cutting body has at least two cutting elements, preferably at least three cutting elements, preferably at least four cutting elements.
  • the connection of the cutting body with the drilling tool takes place in particular via a cohesive connection.
  • the Bohrköpf is designed as a solid carbide head, wherein a single cutting body is connected to at least one cutting element via a blunt surface with the shaft member and / or the sleeve member, preferably connected via a welded joint.
  • the drilling tool has incisions into which the at least one cutting body is inserted, in particular is connected by means of a solder joint.
  • the connection region has at least one connecting element which is designed to connect the drilling tool to a suction adapter.
  • the suction adapter is partially movable in the connected state to the drilling tool.
  • the suction adapter is substantially axially immovable on the drilling tool and rotatably supported around the drilling tool, so that the suction adapter is axially fixed on the drilling tool substantially and the drilling tool can rotate within the suction adapter.
  • the Suction adapter fixed to the drilling tool with clearance.
  • the suction opening is arranged in particular in the connection area.
  • the transport channel is partially arranged in the connection area. In particular, the transport channel ends in the connection area.
  • the shaft element is preferably materially connected to the drill head, in particular to the cutting body.
  • the shaft member cuts the longitudinal axis of the drilling tool.
  • the shaft element lies in particular at least partially, preferably completely axially on the drill head or on the cutting body.
  • the shaft element is designed in particular for transmitting a shock pulse from the power tool to the drill head.
  • the shaft element consists of a metallic material, in particular of a steel.
  • the inflow channel is arranged at the end of the shank region facing the drill head. In particular, a length of the inflow channel exceeds a width and / or a depth of the inflow channel.
  • the air flow in the region of the drill head can thereby be further optimized.
  • the length of the recess forming the inflow channel is at least twice the width of the recess.
  • the length of the recess is greater than the width, which in turn is greater than the depth of the recess.
  • the width of the recess in the direction of the drill head increases steadily.
  • the inflow channel transitions substantially flush into the drill head, in particular substantially flush with one
  • the area of the inflow channel can thereby be increased or maximized.
  • the suction port and the inflow channel in
  • a plane lying on the longitudinal axis of the drilling tool intersects at least one inflow channel and an intake opening assigned to the inflow channel, in particular a suction opening closest to the inflow channel.
  • the suction efficiency can thereby be improved.
  • the intake opening and the inflow passage may be at least partially, in particular completely, circumferentially spaced from one another.
  • the suction opening and the inflow channel are at least partially axially and / or radially spaced from each other.
  • At least one cutting element of the cutting body is arranged in the circumferential direction between the transport channel and the inflow channel.
  • the cutting element is designed as a secondary cutting element, wherein the secondary cutting element has an axial distance to a tip of the cutting body, which is at least 25
  • % in particular by at least 50%, preferably by at least 100%, is greater than the distance of a main cutting element to the tip.
  • the air flow can thereby flow via the secondary cutting element from the inflow channel to its associated and / or nearest intake opening.
  • Tip of the drilling tool to the cutting edge of the main cutting element or the secondary cutting element along the longitudinal axis Tip of the drilling tool to the cutting edge of the main cutting element or the secondary cutting element along the longitudinal axis to be understood.
  • the distance of the cutting edges from the tip can be understood as a minimum or as a maximum distance of the cutting edges of the tip. It is also conceivable to determine the distance of the cutting edges from the tip over a mean height or a mean distance of the cutting edges. In addition, it is conceivable that in cutting elements with more than one cutting edge only the longest cutting edge is taken into account.
  • the axial distance of the minor cutting edge from the main cutting edge is greater than the penetration depth of the drilling tool per stroke into the workpiece or larger than the impact amplitude.
  • the cutting element is interrupted radially outside and / or inside.
  • an uninterrupted flow from the inflow channel into the intake opening can thus always be realized.
  • Cutting elements are interrupted in particular by voids.
  • a radially inner empty space adjoins laterally on at least two, in particular opposite cutting elements.
  • a radially outer empty space adjoins laterally on a cutting element and on an envelope surrounding the drill head, in particular the cutting body.
  • the area of the void is at least 30% of the cross-sectional area of the suction opening, preferably at least 60% of the cross-sectional area of the suction opening, preferably at least 90% of the cross-sectional area of the suction opening.
  • the inflow channel is in operative connection with at least two transport channels.
  • the cutting elements of the cutting body are interrupted in such a way that a continuous flow channel is formed between the cutting elements.
  • the air flow during the drilling process can thereby be made more efficient by allowing an air flow even when the drilling tool makes contact with the bottom of the borehole.
  • the continuous flow channel extends in particular in a substantially circular manner around the longitudinal axis of the drilling tool.
  • other guides of the air flow such as substantially ovalfömig around the longitudinal axis of the drilling tool around, conceivable.
  • a ratio between an inflow surface, through which an air flow moves in the direction of the drill head, and a suction surface in the shaft region, through which the air flow moves in the opposite direction in a range between 0.7 and 1 3, in particular in a range between 0.8 and 1.2, preferably in a range between 0.9 and 1.1, preferably substantially 1.
  • the inflow area is designed in particular as the area which is between a
  • Cutting body circumscribing envelope and a maximum diameter of the shaft area is located.
  • the inflow area is increased by the inflow channels.
  • the suction surface results in particular from the sum of the cross-sectional areas of the transport channels in the area in which the sum is maximum.
  • the drilling tool has, in the circumferential direction adjacent to the inflow channel, at least one flow element which is designed to locally increase the flow resistance.
  • the flow elements can be formed integrally with the shaft region, in particular the shaft element or the sleeve element, or integrally with the cutting body.
  • the flow element may be formed, for example, as a bead-shaped thickening.
  • the flow element is designed as a diffuser element, such as, for example, at least one groove extending in the circumferential direction, which is designed to delay the flow locally.
  • the diffuser element has an opening angle of 60 ° to 120 °, in particular substantially 90 °.
  • the secondary cutting element has a rake angle ⁇ of less than 30 °, in particular a rake angle ⁇ in a range between 0 ° and 29 °, preferably in a range between 0 ° and 15 °.
  • the drilling tool has a multi-part shaft element which comprises at least two shaft parts.
  • a particularly cost-effective drilling tool with optimized transport channels can be realized by the formation of the shaft member of a plurality of shaft parts.
  • each of the shaft parts is designed to transmit a shock pulse from the power tool to the drill head.
  • the drill head has a cutting body which is fastened to at least two shank parts.
  • each shaft part abuts axially on at least one cutting body.
  • Each shaft part preferably has an incision or a blunt end-side joining surface for connection to a cutting body. The incisions or the blunt end-side joining surfaces of the shaft parts can merge into one another, so that a common incision or a common blunt end-side joining surface is formed.
  • the shaft members are made of the same material.
  • the shaft parts are connected to each other by means of a material connection, in particular by means of a material and positive connection.
  • a material connection in particular by means of a material and positive connection.
  • the cohesive connection can be exemplified as an adhesive bond, a solder joint or a welded joint may be formed.
  • the positive connection can be realized by corresponding form-fitting elements, such as a toothing or nub elements and trough elements.
  • the form-locking elements can be arranged in particular at the beginning or at the end of the shaft parts.
  • the joining process can be simplified by the additional positive locking elements by lateral slipping of the shaft parts is prevented from each other.
  • a pure positive connection for connecting the shaft parts is conceivable.
  • the shaft parts are connected to one another along a joining surface which extends at least through the entire shaft region.
  • each of the shaft parts forms part of a lateral surface of the shaft element.
  • the joining surface extends along the entire length of the shaft element and / or the shaft parts.
  • the joining surface extends from an end of the drilling tool facing away from the drill head to the drill head.
  • the joining surface is at least partially formed as a plane extending in particular through the longitudinal axis.
  • a particularly large joint surface can be realized thereby.
  • At least one of the shaft parts has at least one groove which is arranged in the joining surface.
  • this can be realized in a structurally simple manner, a transport channel within the drilling tool or within the shaft member.
  • the groove is arranged at a distance from the lateral surface of the shaft element.
  • the groove may be rectilinear, oblique, wavy, or other shape along its longitudinal extent.
  • the shaft element is formed in two parts from a first shaft part and a second shaft part.
  • the first and the second shaft part each have at least one groove, which together form the transport channel in the connected state.
  • the two shaft parts are mirror-symmetrical to one another.
  • the at least one transport channel has at least one bypass opening which is arranged between the suction opening and the suction opening.
  • the bypass bore may be formed as a transverse bore extending perpendicularly or obliquely to the longitudinal axis of the drilling tool.
  • the bypass opening may be in the area of the drill head and / or in the
  • the bypass opening is arranged in the vicinity of the drill head facing the end of the shaft portion.
  • the Bypsassö réelle is arranged at the end of a portion of the shaft portion in which the outer diameter is constant.
  • the bypass opening is arranged in front of a widening of the outer diameter of the drilling tool.
  • the bypass opening is arranged before a tapering or reduction of the inflow area.
  • the transport channel may have a plurality of bypass openings, which are arranged in the circumferential direction next to one another and / or axially one behind the other.
  • the drilling tool has at least two transport channels, wherein each transport channel has at least one bypass opening.
  • each transport channel has at least one bypass opening.
  • the bypass opening is arranged such that a volume flow within the transport channel is increased by a constant factor.
  • a constant factor is to be understood in particular as meaning that the air volume flow provided via the bypass opening is independent of the impact position of the drilling tool.
  • the transport channel is thus always supplied with fresh air.
  • the cross-sectional area of the transport channel in the shaft region is greater than in the region of the intake opening.
  • a ratio between the difference formed by the cross-sectional area of the transport channel and the cross-sectional area of the suction opening and a cross-sectional area of the bypass opening is between 0.7 and 1.3, preferably between 0.85 and 1.15.
  • the difference essentially corresponds to chen the cross section of the bypass opening.
  • the cross-sectional area of the transport channel changes.
  • the cross-sectional area of the transport channel increases counter to a feed direction.
  • the transport of cuttings in the transport channel can thereby be improved and blockages prevented.
  • the cross-sectional area of the transport channel increases substantially steadily or evenly.
  • the cross-sectional area increases steadily and uniformly counter to the feed direction and thus assumes a conical shape.
  • the cross-sectional area of the transport channel increases by at least 50% counter to the feed direction, preferably by at least 100% counter to the feed direction, preferably by at least 250% counter to the feed direction.
  • the cross-sectional area of the transport channel increases continuously by at least 0.005 cm 2 per cm extension against the feed direction, preferably by at least 0.01 cm 2 per cm extension against the feed direction.
  • the cross-sectional area changes abruptly, at least in one area.
  • an enlargement of the cross section of the transport channel in the shaft region can be realized structurally simple.
  • the transport channel in the shaft region is realized by at least two bores with different diameters and lengths.
  • Fig. 1 is a schematic view of a tool system
  • FIG. 2 shows a longitudinal section through an inventive drilling tool.
  • FIG. 3a shows a perspective view of a drill head of the drilling tool according to FIG. 2;
  • FIG. 3b is a plan view of the drill head according to FIG. 3a;
  • FIG. 3c shows a side view of the drill head according to FIG. 3a;
  • FIG. 3d shows a side view rotated by 90 ° of the drill head according to FIG. 3c;
  • Fig. 4a is a perspective view of an alternative embodiment of the drilling tool
  • FIG. 4b shows a perspective view of a further alternative embodiment of the drilling tool
  • Fig. 4c is a perspective view of an additional alternative embodiment of the drilling tool; a perspective view of another alternative embodiment of the drilling tool; a longitudinal section of the drill head of FIG. 5a; an exploded view of a shaft member of another alternative embodiment of the drilling tool; an exploded view of a shaft member of an additional alternative embodiment of the drilling tool; a longitudinal section of an alternative embodiment of the drilling tool with a bypass opening; a diagram with the pressure course at the drill head during the drilling process; a longitudinal section through a further embodiment of the drilling tool.
  • FIG. 1 shows a schematic view of a tool system 200.
  • the tool system 200 comprises a drilling tool 10, a hand tool machine 300 and a suction device 400.
  • the hand tool 300 is designed, for example, as a hammer drill.
  • the hand tool 300 has a tool holder 302, which is designed to receive an exemplary trained as a drilling tool 10 insert tool.
  • the handheld power tool 300 has a drive unit, not shown, comprising an electric motor, and a transmission comprising a pneumatic percussion mechanism. About the drive unit and the transmission, the drilling tool 10 in the coupled state rotationally about a longitudinal axis 12 of the drilling tool 10 and linearly oscillating or beating along the longitudinal axis 12 are driven.
  • the drilling tool 10 is designed as a rock drill and shown in Fig. 2 in an enlarged view.
  • the drilling tool 10 is in particular intended to produce a borehole in a workpiece 14 (see FIG. 1), which is designed, for example, as a masonry.
  • the wellbore is generated via a striking movement of the drilling tool 10 along the longitudinal axis 12 and a rotational movement of the drilling tool 10 about the longitudinal axis 12.
  • the drilling tool 10 has an insertion end 16, which is designed to couple the drilling tool 10 to the handheld power tool 300.
  • the insertion end 16 is substantially cylindrical in shape and has form-closure elements 18, which are formed as elongated grooves.
  • the tool holder 302 of the handheld power tool 300 has not shown corresponding positive locking elements, which are connected in the coupled state with the positive locking elements 18 of the drilling tool 10.
  • the drilling tool 10 has along its longitudinal extension a connection region 20 for connecting the drilling tool 10 with a suction adapter 402, a shank region 22 and a drill head 24.
  • the front end of the drilling tool 10 is formed by the drill head 24 and the rear end of the drilling tool 10 is formed by the insertion end 16.
  • the suction adapter 402 is connected via a hose 403 to the suction device 400 designed as an industrial vacuum.
  • the suction adapter 402 and the drilling tool 10 are rotatably connected relative to each other.
  • the drilling tool 10 is completely enclosed in the connection area 20 by the suction adapter 402.
  • the drilling tool 10 has, in the connection region 20, a connecting element 26 configured as an outer peripheral groove.
  • the suction adapter 402 has a corresponding connecting element 404 designed as a rubber ring. In the connected state, the connecting elements 26, 404 are engaged with one another in such a way that the suction adapter is held in the axial direction with play.
  • the drill head 24 is formed by a solid carbide head
  • Cutting body 28 formed.
  • the drill head 24 is shown in a perspective view in FIG. 3a and in a plan view in FIG. 3b.
  • the cutting body 28 comprises four cutting elements 30, in particular two main cutting elements 32 and two secondary cutting elements 34.
  • the cutting elements 30 of the cutting body 28 are arranged in a cross shape.
  • the cutting body 28 is formed integrally by way of example. In the circumferential direction 36 about the longitudinal axis 12, the main cutting elements 32 and secondary cutting elements 34 are arranged alternately.
  • the drill head 24 has a tip 38 designed as a centering tip, which protrudes in such a manner on the front side that it first comes into contact with the workpiece 14.
  • the drilling tool 10 has a shaft element 40 and a sleeve element 42 in the shaft region 22.
  • a transport channel 44 Radially between the shaft member 40 and the sleeve member 42 is arranged a transport channel 44 for the removal of cuttings from the wellbore.
  • the sleeve element 42 extends from the connection region 20 to the drill head 24.
  • the sleeve element 42 is integrally connected to the shaft element 40.
  • the sleeve element 42 is integrally connected to the shaft element 40 in the shaft region 22 and in particular also in the connection region 20.
  • the cohesive connection can be realized, for example, via a solder connection, a welded connection, an adhesive connection, etc.
  • the transport channel 44 extends completely along the longitudinal axis 12 through the shank region 22.
  • the transport channel 44 has suction openings 46, through which the cuttings enter into the transport channel 44 during the production of the borehole, and suction opening 48, via which the cuttings leaves the transport channel 44, on.
  • the shaft member 40 has two outboard grooves 45 extending straight and parallel to the longitudinal axis 12 through the shaft portion 22.
  • the grooves 45 are axially open at their end facing the drill head 24. At its end facing away from the drill head 24, the grooves 45 are axially closed.
  • the grooves 45 are open in the shaft member 40 radially outward along its longitudinal extent. Radially, the grooves 45 are completed in the shaft portion 22 by the sleeve member 42 such that the transport channels 44 are closed in the shaft portion 22 in the circumferential direction 36.
  • the sleeve member 42 is formed closed in the circumferential direction.
  • the sleeve member 42 has a substantially constant inner diameter.
  • the transport channels 44 each have a cross-sectional area 50 which is substantially constant.
  • the cross-sectional area 50 (see Fig. 2) of the transport channel 44 is formed constant over the entire shaft area 22.
  • the profile of the transport channel 44 has a substantially straight skeleton line.
  • the skeleton line is formed substantially along the entire transport channel 44, preferably between the suction port 46 and the suction opening 48, in a straight line.
  • the suction opening 48 of the transport channel 44 is formed by a transverse bore 52 (see Fig. 2), which is arranged in the sleeve member 42.
  • the suction opening 48 opens substantially perpendicular to the suction opening 46 or radially to the longitudinal axis 12 of the drilling tool 10.
  • the groove 45 of the shaft member 40 is flush with the transverse bore 52 from.
  • the cross-sectional area 50 of the transport channel 44 decreases in the connection region 20, in particular in the region of the suction opening 48.
  • the groove 44 closes axially in particular by a curved or rounded shape.
  • the suction opening 46 is arranged in the region of the drill head 24.
  • the suction port 46 is formed by the cutter body 28.
  • the designed as a solid carbide head cutting body 28 has a cross section in the form of a substantially eight.
  • the cutting body 28 has a sockeiförmigen base 77, from which four cutting elements 30 project in the axial direction.
  • the main cutting elements 32 In the middle of two main cutting elements 32 are arranged, which merge into each other.
  • the main cutting elements 32 each have a main cutting edge 78 on, which are connected via a cross-cutting edge.
  • the two main cutting elements 32 are interrupted radially outward by a void 82.
  • the two secondary cutting elements 34 are interrupted radially inwardly by a space 83 and form the maximum diameter of the cutting body 28 and the drill head 24.
  • the secondary cutting elements 34 are in particular radially outwardly beyond the sockeiförmigen base body 77 addition.
  • the two minor cutting elements 34 are arranged on opposite sides of the main cutting elements 32.
  • the two secondary cutting elements 34 are each spaced from the main cutting elements 32 by the voids 83.
  • the drilling tool 10 has two inflow channels 66, which are formed by recesses 84, 85.
  • the two inflow channels 66 are arranged opposite one another.
  • the sleeve element 42 has an outer recess 84, which is arranged in the region of the sleeve element 42 facing the drill head 24.
  • the recess 84 may extend along the entire length of the sleeve member 42.
  • the cutting body 28 has an outer recess 85 which extends through the entire body 77.
  • the recess 84 in the sleeve member 42 and the recess 85 in the cutting body 28 are substantially flush with each other.
  • the recesses 84, 85 are for example concave, but other geometries, such as rectangular, circular, etc. are also conceivable.
  • the recesses 84, 85 are rectilinear.
  • the recesses 84, 85 have a substantially constant cross-section.
  • the cross section of the recesses 84, 85 results in particular from the difference of the sleeve element 42 or the cutting body 28 circumscribing envelope and the respective lateral surface.
  • the width 67 of the inflow channels or their lateral extent in the circumferential direction of the drilling tool 10 is limited by the secondary cutting element 34 and the empty space 82.
  • the inflow channels 66 each have a midpoint angle ⁇ of substantially 50 °.
  • the inflow channels each have a center angle ⁇ in a range between 0 ° and 90 °, preferably in a range between 20 ° and 70 °.
  • the sum of the center angle ⁇ is thus 100 °.
  • the sum of the midpoint angles is above 30 °, preferably above 60 °, preferably above 90 °.
  • the cutting body 28 has two passages 86 which are peripherally limited by the main body 77.
  • the passages 86 form the suction openings 46 of the transport channels 44.
  • the suction opening 46 thus forms a purely axial opening through which air and cuttings can enter the transport channel 44.
  • the cross sections of the passages 86 are formed substantially triangular. However, it is also conceivable that the cross sections of the passages are polygonal with sharp or soft edges or oval-shaped.
  • the cross section of the passages 86 is formed constant along the longitudinal extension 12.
  • the inflow channel 66 or the recess 85 in the cutting body 28 ends axially at the same height at which the suction opening 46 or the passage 86 begins.
  • the inflow channel 66 and the suction opening 46 are arranged partially radially spaced from one another.
  • a partial radial spacing should be understood to mean, in particular, that the radial spacing of the suction port 46 and the inflow channel 66 is partially equal from the longitudinal axis 12, but the radially maximum distance of the inflow channel 66 from the longitudinal axis 12 is greater than the radial maximum Distance of the suction port 46 and the radially minimum distance of the suction port 46 is smaller than the radially minimum distance of the inflow channel 66.
  • the suction ports 46 are partially radially between the cutting elements 30, in particular partially radially between the main cutting element 32 and the secondary cutting element
  • the main cutting elements 32 divide the drill head 24 into two sides, each side having a minor cutting element 34, a suction port 46 and an inflow channel 66.
  • the cutting elements 30 each have a rake surface 90 and an open surface 92.
  • the rake surface 90 of the secondary cutting element 34 faces the inflow channel 66 and the free surface 92 of the side cutting element 34 faces the suction opening 46.
  • the passages 86 are formed such that a ratio between the cross section of the passage 86 or the suction opening 46 and the cross-sectional area 50 of the transport channel 44 is at least 0.85.
  • the inflow passage 66 is formed such that a cross section of the inflow passage 66 c substantially corresponds to the cross section of the suction port 46.
  • the voids 82, 83 are arranged axially at the same height. In particular, all the empty spaces 82, 83 adjoin one of the main cutting elements 32.
  • the outer voids 82 are disposed partially radially spaced from the inner voids 83. However, it is also conceivable that the outer voids are arranged completely radially spaced from the inner voids 83.
  • the voids 82, 83 extend in length from the main body 77 to a maximum height of the main cutting edge 78 and secondary cutting edge 94 of the cutting elements 30. In particular, the voids 82 start at the level of the beginning of the suction port 46 and / or the end of the inflow channel 66th ,
  • Fig. 3c is a side view of the front portion of the drilling tool 10 is shown.
  • the drilling tool 10 has at least one flow element 96 in the region of the drill head 24.
  • the flow element 96 is formed as a conical shape of the outer contour of the cutting body 28, in particular of the base body 77.
  • the diameter of the envelope of the cutting body 28 in the direction of the tip 38 is increased by the conical course.
  • the flow element 96 is disposed immediately adjacent to the inflow channel 66.
  • a 90 ° rotated side view of the drilling tool 10 is shown.
  • the secondary cutting elements 34 are formed in this embodiment of the drilling tool 10 for removing rocks.
  • the secondary cutting element 34 has, for example, a rake angle ⁇ of approximately 20 ° to 30 °, a clearance angle ⁇ of approximately 20 ° to 30 ° and the resultant wedge angle ⁇ of approximately 90 °.
  • the rake angle ⁇ results from the angle between the rake surface 90 and a plane coaxial with the longitudinal axis 12 of the drilling tool 10.
  • the clearance angle ⁇ results from the angle between the free surface 92 and a Plane perpendicular to the longitudinal axis 12.
  • the wedge angle ⁇ results from the angle between the free surface 92 and the rake surface 90th
  • FIG. 4a shows a perspective view of an alternative embodiment of the drilling tool 10a.
  • the drill head 24a consists of one as a
  • Solid carbide head formed cutting body 28 a which is identical to the cutting body 28 of the previous embodiment.
  • the sleeve member 42a widens in diameter in the end of the shaft portion 22a facing the drill head 24a.
  • the inflow passage 66a is defined by an outer recess 84a in the sleeve member 42a and an outer one
  • the recess 84a in the sleeve member 42a widens and deepens along its longitudinal extent continuously to guide the air flow optimally.
  • FIG. 4b shows a further alternative embodiment of the drilling tool 10b.
  • the drill head 24b consists of a cutter body 28b designed as a solid carbide head.
  • the cutting body 28b is formed in a cross shape.
  • the cutting body 28b comprises two main cutting elements 32b and two secondary cutting elements 34b, which run into one another in the tip 38b.
  • Cutting elements 30b, the cutting body 28b each have a radially outer recess 85b.
  • the recesses 85b have a substantially oval-shaped cross-section.
  • the cross-section of the recesses 85b is formed substantially constant along its longitudinal extent.
  • the sleeve member 42b has at its end facing the drill head 24b two different in their shape and size recesses 84b, 98b.
  • the recesses 84b, 98b have a similar cross-section.
  • the recesses 84b, 98b are spaced apart in the circumferential direction and end in the front end of the sleeve element 42b.
  • the recesses 85b of the cutter body 28b and the recesses 84b, 98b of the sleeve member 42b are arranged so as to be substantially flush with each other.
  • the inflow passage 66b is formed by the longer recess 84b in the sleeve member 42b and the recess 85b in the cutter body.
  • the suction port 64b is defined by the shorter recess 98b in FIG Sleeve member 42b and the recess 85b formed in the cutting body 28b.
  • the suction port 46b is open both axially and radially outwardly.
  • the length of the recesses 98b forming the intake openings 46b is significantly shorter than the length of the recesses 84b forming the inflow channels 66b. In particular, the length of the shorter recesses 98b is less than 25% of the length of the longer recesses 84b.
  • Axial between the beginning of the longer recess 84b and the beginning of the shorter recess 98b of the sleeve members 42b and below the suction opening 46b forming the shorter recess 98b flow elements 96b are arranged.
  • the flow elements 96b are formed as circumferentially extending grooves in the sleeve member 42b.
  • the grooves extend at a constant distance from the tip 38 of the drilling tool 10. However, it is also conceivable that the grooves have a different orientation, such as oblique or wavy.
  • the secondary cutting elements 34b are arranged axially set back relative to the main cutting elements 32b.
  • the mean height of the minor cutting edge 94b is axially recessed such that the axial distance of the minor cutting edge 94b from the tip 38b is more than twice the distance of the mean height of the major cutting edge 78b from the tip 38b.
  • the cutting edge geometry can be optimized in terms of flow.
  • the minor cutting elements 34b have a rake angle ß of about 30 °. Since the secondary cutting elements 34b are set back axially in such a way behind the main cutting elements 32b that they merely fulfill a supporting function and come into contact with the workpiece in the event of being subjected to a reinforcement, larger rake angles ⁇ are also conceivable. In particular, the rake angle ß can be made larger than the Clearance angle ⁇ .
  • the rake angle ⁇ is in a range between 30 ° and 80 °.
  • the secondary cutting element 34b has no sharp cutting edge 94b, but has a rounded edge, in which the rake surface 90b merges into the free surface 92b.
  • the drill head 24b is shown with a slightly changed cutting geometry of the secondary cutting elements 34b in a side view.
  • the rake angle ß is exemplified about 80 °.
  • FIGS. 5a and 5b show a further alternative embodiment of the drilling tool 10c.
  • the drill head 24c is not formed as a solid carbide head, but has three cutting body 28b, which are used in the manufacture of the drill bit in incision and materially and / or non-positively connected to the shaft member 40c.
  • the cutting bodies 28c are soldered to the shaft element 40c.
  • a cutting body 28b forming the tip 38c of the drilling tool 10c includes two main cutting elements 32c extending radially outward from the tip 38c.
  • the main cutting elements 32c are interrupted radially outwardly by voids 82c.
  • the drill head 24c has two cutters 28c designed as secondary cutting elements 34c, which are arranged on opposite sides. Between the cutting bodies 28c, in particular between the main cutting elements 32c and the secondary cutting elements 34c, radially inward voids 83c are formed.
  • the drilling tool 10c has a centric transport channel 44c which divides into two suction openings 46c in the drill head 24c (see FIG. 5b).
  • the two suction openings 46c are formed as bores in the shaft element 40c and extend obliquely to the longitudinal axis 12c.
  • the suction ports 46c are formed axially as well as radially open.
  • the transport channels 44c are disposed within the shaft member 40c.
  • the drilling tool 10c has inflow channels 66c, which are formed by external recesses 102c in the shaft element 40c.
  • the inflow channels 66c extend in a straight line over the entire region of the shaft element 40c and terminate in the drill head 24c, in particular in the end face of the drilling tool 10c.
  • the entire inflow channel 66c is formed by the recess 102c in the shaft member 40c.
  • the shaft element 40c widens in its end facing the drill head 24c, the recess 102c expanding correspondingly for this purpose.
  • the two inflow channels 66c are arranged opposite each other.
  • the inflow passages 66c and the suction ports 46c are arranged so as to be circumferentially separated from each other by the cutter bodies 28c and the main cutting elements 32c and the minor cutting elements 34c, respectively.
  • the size of the recesses 102c forming the inflow channels 66c is at the distance of the
  • Cutting body 28c adjusted so that the recess 102c is substantially limited by the cutting body 28c and has a maximum size.
  • the inflow channels 66c and the suction openings 46c are arranged radially overlapping or radially at the same height.
  • the empty spaces 82c, 83c and the axially recessed secondary cutting elements 34c realize an optimized air circulation in the region of the drill head 24c.
  • FIG. 6 shows an alternative embodiment of a shaft element 104d for a drilling tool 10d.
  • the shaft element 104d is designed in several parts.
  • the shaft element 104d is formed in two parts and has a first shaft part 106d and a second shaft part 108d.
  • the shaft member 104d extends over the insertion end 16d, the terminal portion 20d and the shaft portion
  • the two shaft parts 106d, 108d are mirror-symmetrical to one another.
  • the two shaft parts 106, 108d are joined together in a material-locking manner via a joining surface IlOd.
  • the cohesive connection can take place, for example, via a solder connection, a welded connection or an adhesive connection.
  • the joining surface IlOd is as a
  • the shaft element 104d has two inner transport channels 44d.
  • the transport channels 44d are formed eccentrically with respect to the longitudinal axis 12d, but it is additionally or alternatively also conceivable that the shaft element 104d has a centric transport channel 44d.
  • the transport channels 44d are formed by grooves 112d, which are arranged in the joining surface IlOd.
  • the grooves 112d extend in the shaft region 22d in a straight line and in particular parallel to one another. In the connection region 20d, the grooves 112d extend in such a way that their spacing from one another is increased.
  • the grooves 112d in the connection region to the lateral surface of the shaft element 104d are leads, so that the grooves 112d in the shaft portion form the suction opening 48d of the drill lOd.
  • the grooves 112d are formed axially open.
  • the grooves 112d terminate in a blunt face 114d provided as a mating face for the bit or bit.
  • the lateral surface of the shaft element 104d corresponds to the lateral surface of the shaft region 22d.
  • the axial opening of the groove 112d can thus form the suction opening 46d or pass into the suction opening 46d, depending on the shape of the drill head.
  • the grooves 112d of the shaft parts 106d, 108d have a semicircular cross section, so that in the connected state results in a circular cross section of the transport channels 44d.
  • the shaft parts 106d, 108d furthermore have connecting elements 26d, which are arranged in the connection region and designed to connect the drilling tool 10d to a suction adapter 402.
  • the connecting members 26d are exemplified as outer grooves extending in the circumferential direction.
  • FIG. 7 an alternative embodiment of the multi-part shaft member 104e is shown.
  • the shaft element 104e is formed in two parts from two identical shaft parts 106e, 108e.
  • the two shaft parts 106e, 108e are connected to one another in a material-locking manner via a planar joining surface 11Oe.
  • the shank parts 106e, 108e have interlocking elements 116e, 118e, which are designed to simplify the joining process.
  • the positive-locking elements 116e, 118e are designed as nub elements 116e and as corresponding trough elements 118e.
  • the interlocking elements 116e, 118e are arranged in the region of the insertion end. Other arrangements of the interlocking elements 116e, 118e are also conceivable.
  • the two shaft parts 106e, 108e each have a groove 112e.
  • each groove 112e forms one of the two transport channels 44e.
  • two grooves together form a transport channel.
  • Fig. 8a a further alternative embodiment of the drilling tool 10 ⁇ is shown.
  • the drilling tool 10 ⁇ has a similar structure as the drilling tool 10 c according to FIG. 5 a and FIG. 5 b.
  • the drilling tool 10f has a shaft element 40f, which partially forms the drill head 24f and has cuts in which cutting bodies 28f are arranged.
  • the outer diameter of the drilling tool 10f or of the shaft element 40f is designed to be constant.
  • the outer diameter of the shaft element 40f expands, which reduces the inflow surface over which the air flow moves in the direction of advance to the drill head 24f.
  • the shaft member 40f has a central bore which forms the transport channel 44f.
  • the transport channel 44f divides into two bores 122f, which run transversely to the longitudinal axis 12f and form the end of the suction openings 46f of the transport channel 44f.
  • the drilling tool 10f is shown in a workpiece 14 during a drilling operation. Drilling tools as known in the art have the property that the pressure on the drill head varies greatly depending on the axial position during the striking movement of the drilling tool in the borehole.
  • FIG. 8b An exemplary pressure curve 124f is shown in FIG. 8b.
  • the pressure curve 124f is shown by way of example in a sinusoidal manner, wherein a real pressure curve can deviate therefrom, depending on the handheld power tool used and the workpiece to be machined.
  • the time of the hammer blow is shown, at which the drilling tool acts on the borehole bottom with a force.
  • the suction openings are closed and a high suction pressure is created in the transport channel.
  • the drilling tool is maximally spaced from the borehole bottom, as a result of which a large amount of air can be sucked in via the suction openings.
  • the drilling tool 10f has bypass openings 120f, via which the air volume flow within the transport channel 44f is increased.
  • the bypass openings 120f are formed by way of example as transverse bores in the shaft element 40f.
  • the shaft element 40f has two opposite bypass openings 120f designed as transverse bores.
  • the bypass openings 120f are in the shank rich 22f arranged.
  • the bypass holes 120f are disposed in a portion of the shaft portion 22f that lies in front of a portion in which the outer diameter of the shaft portion 22f expands to taper the inflow surface.
  • the drilling tool 10f has two air flow paths 130f, 132f, the first one being the first one
  • Air flow path 130f extends over the suction ports 46f and the second air flow path 132f via the bypass openings 120f.
  • the two air flow processes merge into one another in the transport channel 44f, in particular in the shaft region 22f.
  • FIG. 8b shows an exemplary pressure profile 134f for a drilling tool 10f with bypass openings 120f.
  • the drilling tool 10f has a mean lower pressure because the volume flow is increased by a constant factor.
  • the amplitude of the pressure curve decreases, since at least partially a supply of the transport channel 44f with fresh air is ensured.
  • the application of the bypass openings 120f is not limited to the present embodiment, but can be applied to other configurations of the drilling tool or the transport channels.
  • the bypass openings are arranged in a sleeve element as described above.
  • FIG. 9 an alternative embodiment of the transport channel 44g is shown.
  • the drilling tool 10g has by way of example a centric transport channel 44g, which is arranged within a shaft element 40g, divides in the area of the drill head 24 and ends in two suction openings 46g.
  • the cross section of the transport channel 44g increases counter to the feed direction 136g.
  • the cross section of the transport channel 44g only increases in the shank region 22g of the drilling tool 10g.
  • the cross section of the transport channel 44g increases continuously and uniformly, so that a cone-shaped profile of the transport channel
  • the cross section of the transport channel 44g is maximally formed and has a suction opening 48g designed as a transverse bore.
  • the described geometry of the transport channel 44g is not limited to the present embodiment, but can also be used in other embodiments of the drilling tool or the transport channels. the. By way of example, it is likewise conceivable that transport channels, which are arranged radially between a sleeve element and a shaft element, are conically shaped.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention concerne un outil de forage qui s'étend le long d'un axe longitudinal, comprenant une tête de forage, une zone de raccordement pour relier l'outil de forage à un dispositif d'aspiration, une zone de tige qui est disposée entre la tête de forage et la zone de raccordement et au moins un canal de transport qui s'étend le long de la zone de tige. Selon l'invention, l'outil de forage présente au moins un canal d'amenée différent du canal de transport et réalisé sous la forme d'un évidement dans la zone de tige et/ou dans la tête de forage.
PCT/EP2018/075735 2017-10-30 2018-09-24 Outil de forage Ceased WO2019086169A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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DE102017219444.8A DE102017219444A1 (de) 2017-10-30 2017-10-30 Bohrwerkzeug
DE102017219444.8 2017-10-30

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WO2024068266A1 (fr) * 2022-09-30 2024-04-04 Robert Bosch Gmbh Pointe en métal dur pour un outil de perçage ; outil de perçage comportant une pointe en métal dur

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AT522054B1 (de) * 2019-01-30 2020-12-15 Alpen Maykestag Gmbh Saugbohrwerkzeug

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US2895355A (en) * 1953-03-04 1959-07-21 Maskin R L Carlstedt Fa Drill shank for drills
DE2910323A1 (de) 1979-03-16 1980-10-02 Bosch Gmbh Robert Bohrwerkzeug, insbesondere gesteinsbohrer
WO2009107235A1 (fr) * 2008-02-29 2009-09-03 オーエスジー株式会社 Foret à aspiration de copeaux
EP2839924A1 (fr) * 2013-08-19 2015-02-25 The Boeing Company Outil de coupe à vide alimenté par un fluide
WO2017053295A1 (fr) * 2015-09-22 2017-03-30 Allied Machine & Engineering Corp. Système de forage et procédés pour forage de trou profond

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DE19810192A1 (de) * 1998-03-10 1999-09-16 Hilti Ag Bohrwerkzeug
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DE919402C (de) * 1950-09-02 1954-10-21 Bosch Gmbh Robert Gesteinsbohrer
US2895355A (en) * 1953-03-04 1959-07-21 Maskin R L Carlstedt Fa Drill shank for drills
DE2910323A1 (de) 1979-03-16 1980-10-02 Bosch Gmbh Robert Bohrwerkzeug, insbesondere gesteinsbohrer
WO2009107235A1 (fr) * 2008-02-29 2009-09-03 オーエスジー株式会社 Foret à aspiration de copeaux
EP2839924A1 (fr) * 2013-08-19 2015-02-25 The Boeing Company Outil de coupe à vide alimenté par un fluide
WO2017053295A1 (fr) * 2015-09-22 2017-03-30 Allied Machine & Engineering Corp. Système de forage et procédés pour forage de trou profond

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Publication number Priority date Publication date Assignee Title
WO2024068266A1 (fr) * 2022-09-30 2024-04-04 Robert Bosch Gmbh Pointe en métal dur pour un outil de perçage ; outil de perçage comportant une pointe en métal dur

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DE102017219444A1 (de) 2019-05-02
CN111295262A (zh) 2020-06-16

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