EP3523496B1 - Drilling crown - Google Patents

Drilling crown Download PDF

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Publication number
EP3523496B1
EP3523496B1 EP16787756.2A EP16787756A EP3523496B1 EP 3523496 B1 EP3523496 B1 EP 3523496B1 EP 16787756 A EP16787756 A EP 16787756A EP 3523496 B1 EP3523496 B1 EP 3523496B1
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EP
European Patent Office
Prior art keywords
hard material
drill bit
head
seat
drill
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EP16787756.2A
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German (de)
French (fr)
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EP3523496A1 (en
Inventor
Romain Clesen
Gerhard Meier
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TMT Tapping Measuring Technology SARL
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TMT Tapping Measuring Technology SARL
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Publication of EP3523496A1 publication Critical patent/EP3523496A1/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/36Percussion drill bits
    • E21B10/38Percussion drill bits characterised by conduits or nozzles for drilling fluids
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B7/00Blast furnaces
    • C21B7/12Opening or sealing the tap holes
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/36Percussion drill bits
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/46Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/46Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56Button-type inserts

Definitions

  • the present invention relates to a drill bit for drilling, in particular rotary percussion drilling, a hole, in particular a tap hole of a melting furnace, the drill bit having a drill head with at least one hard material insert and a base body for connection to a drive element, the hard material insert being inserted into an axial end face of the Drill head designed receptacle is used such that the hard material insert protrudes with at least one head cutting edge of the axial end surface.
  • a drill bit of the type mentioned is from the RU 2 581 059 C1 known.
  • the known drill bit has hard metal inserts arranged on an axial end face of a drill head, which are received in groove-shaped recesses and each have a head cutting edge projecting beyond the axial end face. To fasten the hard metal inserts, they are secured in the groove-shaped receptacles via a hard solder connection.
  • the present invention is based on the object of proposing a drill bit which enables a thermally loadable and at the same time easy to produce mechanical connection between the hard material inserts and a drill head of the drill bit.
  • the drill bit according to the invention has the features of claim 1.
  • the flank section arranged opposite a recess formed in the hard material insert is provided with a material web which is formed at least partially from a welding material, is firmly connected to the drill head via the welding material and protruding into the recess to form a positive connection with the hard material insert.
  • the drill bit according to the invention accordingly has, by means of the material web engaging in the recess of the hard material insert, an engagement connection which, in combination with the opposing flank sections, clearly fixes the hard material insert in its relative position with respect to the drill head, so that a defined positioning of the head cutting edge formed on the hard material insert in the drill head is secured, and thus the desired cutting effect of the head cutting edge can be achieved reproducibly during the drilling process.
  • the material web can be designed in any way and accordingly does not have to have a shape designed to match the outer shape of the hard material insert. Rather, it is possible to simply design the material web in the shape of a bar or cuboid in order to enable the necessary engagement in the recess of the hard material insert.
  • connection of the material web, which engages in the hard material insert in a form-fitting manner, with the drill head is embodied in a materially bonded manner via the welding material as a welded connection; unlike a sleeve, which not only has to be adapted to the shape of the hard material insert in order to accommodate the hard material insert, but also in its shape to the receptacle in the drill head, the material web can simply be welded to the flank of the receptacle via a connecting joint.
  • the material web protruding into the recess of the hard material insert can be made entirely of welding material, so that apart from the welding material itself, no further material or component is necessary to create the connection between the hard material insert and to manufacture the drill head.
  • the material web is designed as a weld point, so that the production of the weld connection apart from the feed movement of a welding head to the welding point does not require any further relative movement between the welding head and the drill head.
  • weld point at least partially fills both a recess formed in the hard material insert next to the recess and a recess formed in the opposite flank section of the receptacle, it is possible to produce a particularly resilient weld point connection.
  • the receptacle in the drill head has an essentially radial longitudinal extent in relation to an axis of rotation of the drill head and an opening at the radially outer end, the hard material insert having a corresponding radial longitudinal extent being received in the receptacle in such a way that the hard material insert protrudes beyond a circumferential surface of the drill head with a radial projection relative to the axis of rotation.
  • the hard material insert with a holding extension which is essentially parallel to the axis of rotation of the drill head and which is inserted into a receiving base of the receptacle trained bottom recess engages.
  • a particularly effective configuration of the hard material insert which contributes to increasing the performance, is possible if the radial protrusion of the hard material insert forms a peripheral cutting edge which extends essentially parallel to the axis of rotation of the drill head.
  • the circumferential cutting edge extends from the head cutting edge protruding beyond the axial end surface of the drill head beyond the base of the receptacle, in such a way that a cutting edge foot of the circumferential cutting edge is received in a second base recess in the base of the receptacle, the occurrence of vibrations of the hard material insert counteracting support of the hard material insert in the drill head is ensured.
  • a plurality of hard material inserts, each inserted in a receptacle, are preferably arranged distributed over the circumference of the end face of the drill head.
  • At least two hard material inserts have a different radial longitudinal extent in relation to the axis of rotation of the drill head, such that radially inner ends of the head cutting edges have a different distance from the axis of rotation of the drill head, so that the cutting performance of the drill bit can be further optimized.
  • a configuration of the drill bit can also be provided in which the receptacle is cylindrical, in particular as a bore, and the hard material insert has an essentially complementary design to the receptacle, having holding extension inserted into the receptacle.
  • the hard material insert has a first and a second head cutting edge which are arranged parallel to one another and extend radially to the axis of rotation of the drill bit.
  • the recess formed in the hard material insert has a flattening that adjoins a shoulder to form the recess and extends to a head cutting edge, particularly good accessibility of the recess is ensured when the welding material is applied to form the material web.
  • the flattened area is preferably arranged in a plane arranged at right angles to the head cutting edge.
  • the hard material insert has, opposite the flattened area and above the holding extension, a radial overhang extending in the direction of the head cutting edge and protruding beyond the mating flank section, so that the length of the head cutting edge is not restricted by the flattening.
  • Fig. 1 shows a drill head 10 for forming an in Fig. 5 drill bit 11 shown.
  • the drill head 10 has a base body 12 which rotates about an axis of rotation R when connected to a suitable drive element, not shown in detail, of a drive device.
  • the base body 12 has an axial end surface 13 which is provided with receptacles 14, which are provided with hard material inserts 16 for producing the drill bit 11, which inserts 16 can be formed, for example, as shaped bodies made of tungsten carbide.
  • the axial end surface 13 equipped with the hard material inserts 16 is directed with contact pressure against the tamping compound closing the tap hole in order to carry out a rotary or rotary percussion drilling, in the latter case the axis of rotation is also the percussion axis.
  • the receptacles 14 are aligned with their longitudinal axes 15 perpendicular to the axis of rotation R and each radially.
  • a shaped body 17 of the hard material insert 16 has a head cutting edge 18 on an upper longitudinal edge and a peripheral cutting edge 19 on an axial end.
  • a number of hard material inserts 16 corresponding to the number of receptacles 14 is inserted into the receptacles 14 in such a way that a holding extension 21 formed on an underside 20 of the shaped body 17 extends into a floor recess 22 a receiving base 23 of the receiving element 14 extends essentially parallel to the axis of rotation 12.
  • the molded body 17 has on its underside 20 a further extension formed by a cutting edge foot 24 of the peripheral cutting edge 19, which engages in a second bottom recess 25 of the receiving base 23, which is arranged in the area of an opening 26 formed at the outer radial end of the receiving 14 so that the circumferential cutting edge 19 forms a radial protrusion which projects beyond a circumferential surface 28 of the base body.
  • the hard material inserts 16 are inserted into the receptacles 14 of the axial end surface 13 of the drill head 10 in such a way that the hard material inserts 16 between a flank section 29 and an opposing counter-flank section 30 of the receptacles 14, which in the present case run parallel to the longitudinal axis 15 of the receptacles 14, are included.
  • the hard material inserts 16 are arranged with a front side 31 adjacent to the flank section 29 and with a rear side 32 adjacent to the counter flank section 30.
  • the hard material inserts 16 are provided with a recess 40 formed following a recess 33, which is arranged opposite a recess 34 formed in the counter-flank section 30, the recesses 40, 34 in the present case being designed complementary in such a way that the recesses 40 and 34 complement each other at least in some areas to form a bore-shaped recess which at least partially provides a receiving space for a material web 35, as in FIG Fig. 6 shown, or a material web 36, as in Fig. 7 illustrated, trains.
  • the formation of the material web 35 is based on the in Fig. 4 illustrated configuration in which the hard material inserts 16 in the Recesses 14 are inserted and the recesses 40 in the hard material inserts 16 are located opposite the recesses 34 in the counter-flank sections 30 of the receptacles 14, in such a way that by a point-like build-up weld in which the welding material 37 is introduced into the recess 34 and with the counter-flank section 30 of the recess 14 is welded, the material web 35 is formed such that it extends from the recess 34 in the counter-flank section 30 into the recess 40 of the hard material inserts 16. A material connection is formed between the welding material 37 and the base body 14.
  • the material web 35 which is formed from the welding material during the build-up welding engages in a form-fitting manner in the recess 40 in the hard material inserts 14, without a material connection taking place.
  • a compressive force can be exerted by the material web 35 on the hard material inserts 16, which leads to the front sides 31 of the hard material inserts 16 frictionally resting against the flank sections 29 of the receptacles 14 formed in the base body 14 thus an exactly defined relative arrangement of the hard material inserts 16 to achieve a correspondingly precisely defined cutting edge geometry on the axial end surface 13 can be realized.
  • the material web 36 is not is formed exclusively from the welding material 37, but to form a defined contact contour 38, which is adapted to the recess 40 in the molded body 17 of the hard material inserts 16, a connector 39 made of a weldable material engages in the recess 40 of the molded body 17.
  • connection piece 39 thus not only functions as a form-fitting engagement body, but also as a force introduction for the defined transmission of the compressive force generated by the build-up welding to the hard material inserts 16.
  • a drill head 42 is provided with hard material inserts 43 which are received in cylinder-shaped receptacles 44, the hard material inserts 43 having a holding extension 45 which is essentially complementary to receptacle 44 and inserted into receptacle 44.
  • Fig. 10 shows a hard material insert 43 in detail.
  • the hard material inserts 43 have a first head cutting edge 46 and a second head cutting edge 47, which are arranged parallel to one another and extend radially to the axis of rotation R of the drill bit 41.
  • Recesses 48 formed in each of the hard material inserts 43 have a flattening 50 adjoining a shoulder to form a recess 49, which extends as far as the head cutting edges 46, 47 and is arranged in a plane arranged at right angles to the head cutting edges 46, 47. Between a flank section 54 and the flattened area 50, a material web 53 formed by welding of welding material 37 on the flank section 54 extends into the recess 48 in a form-fitting manner.
  • the hard material inserts 43 Opposite the flattened area 50 and above the holding extension 45, the hard material inserts 43 have a radial protrusion 52 which extends in the direction of the head cutting edges 46, 47 and projects beyond a counter-flank section 51.

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

Die vorliegende Erfindung betrifft eine Bohrkrone zum Bohren, insbesondere Drehschlagbohren, eines Lochs, insbesondere eines Stichlochs eines Schmelzofens, wobei die Bohrkrone einen Bohrkopf mit zumindest einem Hartmaterialeinsatz und einen Grundkörper zur Verbindung mit einem Antriebselement aufweist, wobei der Hartmaterialeinsatz in eine in einer axialen Endfläche des Bohrkopfs ausgebildete Aufnahme eingesetzt ist, derart, dass der Hartmaterialeinsatz mit zumindest einer Kopfschneidkante die axiale Endfläche überragt.The present invention relates to a drill bit for drilling, in particular rotary percussion drilling, a hole, in particular a tap hole of a melting furnace, the drill bit having a drill head with at least one hard material insert and a base body for connection to a drive element, the hard material insert being inserted into an axial end face of the Drill head designed receptacle is used such that the hard material insert protrudes with at least one head cutting edge of the axial end surface.

Eine Bohrkrone der eingangs genannten Art ist aus der RU 2 581 059 C1 bekannt. Die bekannte Bohrkrone weist auf einer axialen Endfläche eines Bohrkopfs angeordnete Hartmetalleinsätze auf, die in nutförmigen Ausnehmungen aufgenommen sind und jeweils eine die axiale Endfläche überragende Kopfschneidkante aufweisen. Zur Befestigung der Hartmetalleinsätze sind diese über eine Hartlotverbindung in den nutförmigen Aufnahmen gesichert.A drill bit of the type mentioned is from the RU 2 581 059 C1 known. The known drill bit has hard metal inserts arranged on an axial end face of a drill head, which are received in groove-shaped recesses and each have a head cutting edge projecting beyond the axial end face. To fasten the hard metal inserts, they are secured in the groove-shaped receptacles via a hard solder connection.

Um eine ausreichend haltbare Verbindung der Hartmetalleinsätze mit dem Bohrkopf zu erreichen, ist eine im Wesentlichen vollflächige stoffschlüssige Verbindung der Hartmetalleinsätze mit den im Bohrkopf ausgebildeten Aufnahmen erforderlich. Dabei erfordert die Herstellung der Hartlotverbindung zwischen dem Bohrkopf und den Hartmetalleinsätzen zwei Verfahrensschritte, wobei in dem ersten Verfahrensschritt der Bohrkopf erwärmt und die die Kontaktfläche zu den Hartmetalleinsätzen ausbildende Oberfläche der Aufnahmen mit einem Lotmaterialauftrag versehen wird. Nach dem Einsetzen der Hartmetalleinsätze in die Aufnahmen erfolgt in einem zweiten Verfahrensschritt die Erwärmung der Hartmetalleinsätze, um die gewünschte Lotverbindung zwischen dem Bohrkopf und den Hartmetalleinsätzen herzustellen.In order to achieve a sufficiently durable connection between the hard metal inserts and the drill head, an essentially full-surface material connection is required Connection of the hard metal inserts with the receptacles formed in the drill head required. The production of the hard solder connection between the drill head and the hard metal inserts requires two process steps, the drill head being heated in the first process step and the surface of the receptacles forming the contact surface with the hard metal inserts being provided with a layer of solder material. After the hard metal inserts have been inserted into the receptacles, in a second process step the hard metal inserts are heated in order to produce the desired solder connection between the drill head and the hard metal inserts.

Eine Schweißverbindung zwischen den Hartmetalleinsätzen und dem Bohrkopf, die das zur Herstellung einer Hartlotverbindung erforderliche Aufwärmen der über die Lotverbindung miteinander zu verbindenden Bauteile überflüssig machen würde, kann wegen der relativ geringen Temperaturbelastbarkeit der Hartmetalleinsätze nicht durchgeführt werden.A welded connection between the hard metal inserts and the drill head, which would make the heating of the components to be connected to one another via the soldered joint superfluous, cannot be carried out because of the relatively low temperature resistance of the hard metal inserts.

Um trotz der vorstehend erwähnten geringen Temperaturbelastbarkeit der insbesondere in Hartmetall ausgeführten Hartmaterialeinsätze ein Schweißverfahren zur Herstellung einer Verbindung zwischen Hartmaterialeinsätzen und einem Bohrkopf einer Bohrkrone einsetzen zu können, wird beispielsweise in der WO 03/012244 A1 vorgeschlagen, keine direkte, sondern eine mittelbare Schweißverbindung zwischen dem Bohrkopf der Bohrkrone und den in Aufnahmen des Bohrkopfs eingesetzten Hartmaterialeinsätzen dadurch zu ermöglichen, dass die Hartmaterialeinsätze vor dem Einsetzen in die Aufnahmen mit einer die Hartmaterialeinsätze formschlüssig aufnehmenden Hülse versehen werden und nach dem Einsetzen der mit der Hülse versehenen Hartmaterialeinsätze ein Verschweißen der Hülsen mit dem Bohrkopf erfolgt.In order to be able to use a welding method to produce a connection between hard material inserts and a drill head of a drill bit, in spite of the above-mentioned low temperature resistance of the hard material inserts made in particular of hard metal, for example, in WO 03/012244 A1 proposed not to enable a direct, but an indirect welded connection between the drill head of the drill bit and the hard material inserts used in receptacles of the drill head by providing the hard material inserts with a sleeve that positively receives the hard material inserts before insertion into the receptacles and after the insertion of the The hard material inserts provided with the sleeve are welded to the drill head.

Dieses Verfahren ermöglicht zwar eine Sicherung der Hartmaterialeinsätze im Bohrkopf einer Bohrkrone, bei der auch eine Schweißverbindung zum Einsatz kommt, jedoch erfordert das bekannte Verfahren die Bereitstellung eines zusätzlichen Bauteils, das darüber hinaus wegen des zwischen dem zusätzlichen Bauteil und den Hartmaterialeinsätzen notwendigen Formschlusses noch als Hülse ausgebildet sein muss.Although this method enables the hard material inserts to be secured in the drill head of a drill bit, in which a welded connection is also used, the known method requires that Provision of an additional component which, in addition, has to be designed as a sleeve because of the form fit required between the additional component and the hard material inserts.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Bohrkrone vorzuschlagen, die eine thermisch belastbare und zugleich einfach herstellbare mechanische Verbindung zwischen den Hartmaterialeinsätzen und einem Bohrkopf der Bohrkrone ermöglicht.The present invention is based on the object of proposing a drill bit which enables a thermally loadable and at the same time easy to produce mechanical connection between the hard material inserts and a drill head of the drill bit.

Zur Lösung dieser Aufgabe weist die erfindungsgemäße Bohrkrone die Merkmale des Anspruchs 1 auf.To achieve this object, the drill bit according to the invention has the features of claim 1.

Erfindungsgemäß ist der gegenüberliegend einem im Hartmaterialeinsatz ausgebildeten Rücksprung angeordnete Flankenabschnitt mit einem zumindest anteilig aus einem Schweißmaterial gebildeten, über das Schweißmaterial mit dem Bohrkopf stoffschlüssig verbundenen und in den Rücksprung zur Ausbildung einer formschlüssigen Verbindung mit dem Hartmaterialeinsatz hinein ragenden Materialsteg versehen.According to the invention, the flank section arranged opposite a recess formed in the hard material insert is provided with a material web which is formed at least partially from a welding material, is firmly connected to the drill head via the welding material and protruding into the recess to form a positive connection with the hard material insert.

Die erfindungsgemäße Bohrkrone weist demnach mittels des in den Rücksprung des Hartmaterialeinsatzes eingreifenden Materialstegs eine Eingriffsverbindung auf, die in Kombination mit den einander gegenüberliegenden Flankenabschnitten den Hartmaterialeinsatz in seiner Relativposition gegenüber dem Bohrkopf eindeutig fixiert, so dass eine definierte Positionierung der an dem Hartmaterialeinsatz ausgebildeten Kopfschneidkante im Bohrkopf gesichert ist, und somit reproduzierbar die gewünschte Schneidwirkung der Kopfschneidkante während des Bohrvorgangs erzielbar ist. Dabei kann der Materialsteg grundsätzlich beliebig ausgeführt sein, und muss demnach insbesondere keine an die äußere Form des Hartmaterialeinsatzes ausgebildete Gestalt aufweisen. Vielmehr ist es möglich, den Materialsteg einfach riegel- oder quaderförmig auszubilden, um den erforderlichen Eingriff in den Rücksprung des Hartmaterialeinsatzes zu ermöglichen.The drill bit according to the invention accordingly has, by means of the material web engaging in the recess of the hard material insert, an engagement connection which, in combination with the opposing flank sections, clearly fixes the hard material insert in its relative position with respect to the drill head, so that a defined positioning of the head cutting edge formed on the hard material insert in the drill head is secured, and thus the desired cutting effect of the head cutting edge can be achieved reproducibly during the drilling process. In principle, the material web can be designed in any way and accordingly does not have to have a shape designed to match the outer shape of the hard material insert. Rather, it is possible to simply design the material web in the shape of a bar or cuboid in order to enable the necessary engagement in the recess of the hard material insert.

Die Verbindung des formschlüssig in den Hartmaterialeinsatz eingreifenden Materialstegs mit dem Bohrkopf ist über das Schweißmaterial als Schweißverbindung stoffschlüssig ausgeführt; anders als bei einer Hülse, die nicht nur zur Aufnahme des Hartmaterialeinsatzes eine Anpassung an die Form des Hartmaterialeinsatzes, sondern auch in ihrer Formgestaltung an die Aufnahme im Bohrkopf angepasst sein muss, kann der Materialsteg einfach über einen Verbindungsstoß an die Flanke der Aufnahme angeschweißt werden.The connection of the material web, which engages in the hard material insert in a form-fitting manner, with the drill head is embodied in a materially bonded manner via the welding material as a welded connection; unlike a sleeve, which not only has to be adapted to the shape of the hard material insert in order to accommodate the hard material insert, but also in its shape to the receptacle in the drill head, the material web can simply be welded to the flank of the receptacle via a connecting joint.

Besonders vorteilhaft ist es, dass zur Herstellung einer thermisch und mechanisch belastbaren Verbindung der in den Rücksprung des Hartmaterialeinsatzes ragende Materialsteg vollständig aus Schweißmaterial gebildet sein kann, so dass abgesehen von dem Schweißmaterial selbst kein weiteres Material oder Bauteil notwendig ist, um die Verbindung zwischen dem Hartmaterialeinsatz und dem Bohrkopf herzustellen.It is particularly advantageous that, in order to produce a thermally and mechanically resilient connection, the material web protruding into the recess of the hard material insert can be made entirely of welding material, so that apart from the welding material itself, no further material or component is necessary to create the connection between the hard material insert and to manufacture the drill head.

Besonders vorteilhaft ist es, wenn der Materialsteg als Schweißpunkt ausgebildet ist, so dass die Herstellung der Schweißverbindung abgesehen von der Zuführbewegung eines Schweißkopfes zur Schweißstelle keine weitere Relativbewegung zwischen dem Schweißkopf und dem Bohrkopf erfordert.It is particularly advantageous if the material web is designed as a weld point, so that the production of the weld connection apart from the feed movement of a welding head to the welding point does not require any further relative movement between the welding head and the drill head.

Wenn der Schweißpunkt sowohl eine im Hartmaterialeinsatz an den Rücksprung anschließend ausgebildete Ausnehmung als auch eine in dem gegenüberliegenden Flankenabschnitt der Aufnahme ausgebildete Ausnehmung zumindest teilweise ausfüllt, wird die Herstellung einer besonders belastbaren Schweißpunktverbindung möglich.If the weld point at least partially fills both a recess formed in the hard material insert next to the recess and a recess formed in the opposite flank section of the receptacle, it is possible to produce a particularly resilient weld point connection.

Vorzugsweise weist die Aufnahme im Bohrkopf bezogen auf eine Rotationsachse des Bohrkopfs eine im Wesentlichen radiale Längserstreckung auf und am radial äußeren Ende eine Öffnung auf, wobei der eine entsprechende radiale Längserstreckung aufweisende Hartmaterialeinsatz derart in der Aufnahme aufgenommen ist, dass der Hartmaterialeinsatz mit einem bezogen auf die Rotationsachse radialen Überstand eine Umfangsfläche des Bohrkopfs überragt.Preferably, the receptacle in the drill head has an essentially radial longitudinal extent in relation to an axis of rotation of the drill head and an opening at the radially outer end, the hard material insert having a corresponding radial longitudinal extent being received in the receptacle in such a way that the hard material insert protrudes beyond a circumferential surface of the drill head with a radial projection relative to the axis of rotation.

Hierdurch wird es möglich, den Hartmaterialeinsatz so auszugestalten, dass sich dessen Kopfschneidkante über den peripheren Rand der axialen Endfläche des Bohrkopfs hinaus erstreckt.This makes it possible to design the hard material insert in such a way that its head cutting edge extends beyond the peripheral edge of the axial end face of the drill head.

Insbesondere bei einer derartig lang ausgestalteten Kopfschneidkante ist es zur weitergehenden Stabilisierung des Hartmaterialeinsatzes, die insbesondere dem Auftreten von Schwingungen der Hartmaterialeinsätze entgegenwirkt, vorteilhaft, den Hartmaterialeinsatz mit einem zur Rotationsachse des Bohrkopfs im Wesentlichen parallelen Haltefortsatz zu versehen, der in eine in einem Aufnahmeboden der Aufnahme ausgebildeten Bodenausnehmung eingreift.In particular with such a long head cutting edge, for further stabilization of the hard material insert, which in particular counteracts the occurrence of vibrations of the hard material inserts, it is advantageous to provide the hard material insert with a holding extension which is essentially parallel to the axis of rotation of the drill head and which is inserted into a receiving base of the receptacle trained bottom recess engages.

Eine besonders effektive Ausgestaltung des Hartmaterialeinsatzes, die zur Erhöhung der Leistung beiträgt, wird möglich, wenn der radiale Überstand des Hartmaterialeinsatzes eine Umfangsschneidkante ausbildet, die sich im Wesentlichen parallel zur Rotationsachse des Bohrkopfs erstreckt.A particularly effective configuration of the hard material insert, which contributes to increasing the performance, is possible if the radial protrusion of the hard material insert forms a peripheral cutting edge which extends essentially parallel to the axis of rotation of the drill head.

Wenn sich die Umfangsschneidkante ausgehend von der die axiale Endfläche des Bohrkopfs überragenden Kopfschneidkante über den Aufnahmeboden der Aufnahme hinaus erstreckt, derart, dass ein Schneidkantenfuß der Umfangsschneidkante in einer zweiten Bodenausnehmung im Aufnahmeboden der Aufnahme aufgenommen ist, wird für eine weitere dem Auftreten von Schwingungen des Hartmaterialeinsatzes entgegenwirkende Abstützung des Hartmaterialeinsatzes im Bohrkopf gesorgt.If the circumferential cutting edge extends from the head cutting edge protruding beyond the axial end surface of the drill head beyond the base of the receptacle, in such a way that a cutting edge foot of the circumferential cutting edge is received in a second base recess in the base of the receptacle, the occurrence of vibrations of the hard material insert counteracting support of the hard material insert in the drill head is ensured.

Vorzugsweise sind mehrere jeweils in einer Aufnahme eingesetzte Hartmaterialeinsätze über den Umfang der Endfläche des Bohrkopfs verteilt angeordnet.A plurality of hard material inserts, each inserted in a receptacle, are preferably arranged distributed over the circumference of the end face of the drill head.

Besonders bevorzugt ist es, wenn zumindest zwei Hartmaterialeinsätze bezogen auf die Rotationsachse des Bohrkopfs eine unterschiedliche radiale Längserstreckung aufweisen, derart, dass radial innere Enden der Kopfschneidkanten einen unterschiedlichen Abstand zur Rotationsachse des Bohrkopfs aufweisen, so dass die Schnittleistung der Bohrkrone weiter optimiert werden kann.It is particularly preferred if at least two hard material inserts have a different radial longitudinal extent in relation to the axis of rotation of the drill head, such that radially inner ends of the head cutting edges have a different distance from the axis of rotation of the drill head, so that the cutting performance of the drill bit can be further optimized.

Anstatt einer Ausgestaltung der Bohrkrone mit Hartmaterialeinsätzen, die eine definierte radiale Längserstreckung im Bohrkopf aufweisen, kann auch eine Ausgestaltung der Bohrkrone vorgesehen werden, bei der die Aufnahme zylinderförmig, insbesondere als Bohrung, ausgebildet ist, und der Hartmaterialeinsatz einen im Wesentlichen komplementär zur Aufnahme ausgebildeten, in die Aufnahme eingesetzten Haltefortsatz aufweist.Instead of a configuration of the drill bit with hard material inserts that have a defined radial longitudinal extension in the drill head, a configuration of the drill bit can also be provided in which the receptacle is cylindrical, in particular as a bore, and the hard material insert has an essentially complementary design to the receptacle, having holding extension inserted into the receptacle.

Ein drehrichtungsunabhängiger Betrieb der Bohrkrone wird möglich, wenn der Hartmaterialeinsatz eine erste und eine zweite Kopfschneidkante aufweist, die parallel zueinander angeordnet sind und sich radial zur Rotationsachse der Bohrkrone erstrecken.Operation of the drill bit independent of the direction of rotation is possible if the hard material insert has a first and a second head cutting edge which are arranged parallel to one another and extend radially to the axis of rotation of the drill bit.

Wenn die im Hartmaterialeinsatz ausgebildete Ausnehmung eine an einen Absatz zur Ausbildung des Rücksprungs anschließende Abflachung aufweist, die sich bis zu einer Kopfschneidkante erstreckt, ist für eine besonders gute Zugänglichkeit der Ausnehmung bei der Applikation des Schweißmaterials zur Ausbildung des Materialstegs gesorgt.If the recess formed in the hard material insert has a flattening that adjoins a shoulder to form the recess and extends to a head cutting edge, particularly good accessibility of the recess is ensured when the welding material is applied to form the material web.

Vorzugsweise ist die Abflachung in einer zur Kopfschneidkante rechtwinklig angeordneten Ebene angeordnet.The flattened area is preferably arranged in a plane arranged at right angles to the head cutting edge.

Besonders vorzugsweise weist der Hartmaterialeinsatz gegenüberliegend der Abflachung und oberhalb des Haltefortsatzes einen sich in Richtung der Kopfschneidkante erstreckenden, den Gegenflankenabschnitt überragenden radialen Überstand auf, so dass die Länge der Kopfschneidkante nicht durch die Abflachung beschränkt wird.Particularly preferably, the hard material insert has, opposite the flattened area and above the holding extension, a radial overhang extending in the direction of the head cutting edge and protruding beyond the mating flank section, so that the length of the head cutting edge is not restricted by the flattening.

Eine effektive Ausnutzung der axialen Endfläche des Bohrkopfs wird möglich, wenn mehrere jeweils in eine Aufnahme eingesetzte Hartmaterialeinsätze über die Endfläche des Bohrkopfs verteilt angeordnet sind.Effective utilization of the axial end face of the drill head becomes possible if several hard material inserts, each inserted in a receptacle, are arranged distributed over the end face of the drill head.

Nachfolgend wird eine bevorzugte Ausführungsform der Bohrkrone anhand der Zeichnung näher erläutert.A preferred embodiment of the drill bit is explained in more detail below with reference to the drawing.

Es zeigen:

Fig. 1
eine isometrische Darstellung eines Grundkörpers einer ersten Ausführungsform einer Bohrkrone mit in einer axialen Endfläche ausgebildeten Aufnahmen zur Aufnahme von Hartmaterialeinsätzen;
Fig. 2
einen Hartmetalleinsatz in isometrischer Darstellung;
Fig. 3
eine isometrische Darstellung einer Bohrkrone mit in den Aufnahmen der axialen Endfläche eingesetzten Hartmaterialeinsätzen;
Fig. 4
die in Fig. 3 dargestellte Bohrkrone in einer geänderten Ansicht;
Fig. 5
die in den Aufnahmen eingesetzten und mit Materialstegen formschlüssig gesicherten Hartmaterialeinsätze;
Fig. 6
eine Draufsicht auf einer Aufnahme der axialen Endfläche des Grundkörpers eingesetzten Hartmaterialeinsatzes mit einem in einer ersten Ausführungsform ausgebildeten Materialsteg;
Fig. 7
eine Fig. 6 entsprechende Darstellung mit einer weiteren Ausführungsform des Materialstegs;
Fig. 8
ein Anschlussstück zur Ausbildung des in Fig. 7 dargestellten Materialstegs;
Fig. 9
eine Bohrkrone gemäß einer zweiten Ausführungsform;
Fig. 10
einen Hartmaterialeinsatz der in Fig. 9 dargestellten Bohrkrone in Einzeldarstellung.
Show it:
Fig. 1
an isometric view of a base body of a first embodiment of a drill bit with receptacles formed in an axial end surface for receiving hard material inserts;
Fig. 2
a hard metal insert in an isometric view;
Fig. 3
an isometric view of a drill bit with hard material inserts inserted into the receptacles of the axial end face;
Fig. 4
in the Fig. 3 shown drill bit in a changed view;
Fig. 5
the hard material inserts inserted in the receptacles and positively secured with material bars;
Fig. 6
a plan view of a receptacle of the axial end face of the base body inserted hard material insert with a material web formed in a first embodiment;
Fig. 7
a Fig. 6 corresponding illustration with a further embodiment of the material web;
Fig. 8
a connector to form the in Fig. 7 material web shown;
Fig. 9
a drill bit according to a second embodiment;
Fig. 10
a hard material insert of the in Fig. 9 shown drill bit in individual representation.

Fig. 1 zeigt einen Bohrkopf 10 zur Ausbildung einer in Fig. 5 dargestellten Bohrkrone 11. Der Bohrkopf 10 weist einen Grundkörper 12 auf, der bei Anschluss an ein nicht näher dargestelltes geeignetes Antriebselement einer Antriebseinrichtung um eine Rotationsachse R rotiert. Fig. 1 shows a drill head 10 for forming an in Fig. 5 drill bit 11 shown. The drill head 10 has a base body 12 which rotates about an axis of rotation R when connected to a suitable drive element, not shown in detail, of a drive device.

Der Grundkörper 12 weist eine axiale Endfläche 13 auf, die mit Aufnahmen 14 versehen ist, welche zur Herstellung der Bohrkrone 11 mit Hartmaterialeinsätzen 16, die beispielsweise als Formkörper aus Wolframcarbid ausgebildet sein können, versehen werden. Beim Einsatz der Bohrkrone 11 zum Bohren eines Stichlochs wird die mit den Hartmaterialeinsätzen 16 bestückte axiale Endfläche 13 mit Anpressdruck gegen die das Stichloch verschließende Stopfmasse gerichtet, um ein drehendes oder drehschlagendes Bohren auszuführen, wobei im letzteren Fall die Rotationsachse gleichzeitig auch Schlagachse ist. Die Aufnahmen 14 sind im vorliegenden Fall mit ihren Längsachsen 15 senkrecht zur Rotationsachse R und jeweils radial ausgerichtet.The base body 12 has an axial end surface 13 which is provided with receptacles 14, which are provided with hard material inserts 16 for producing the drill bit 11, which inserts 16 can be formed, for example, as shaped bodies made of tungsten carbide. When the drill bit 11 is used to drill a tap hole, the axial end surface 13 equipped with the hard material inserts 16 is directed with contact pressure against the tamping compound closing the tap hole in order to carry out a rotary or rotary percussion drilling, in the latter case the axis of rotation is also the percussion axis. In the present case, the receptacles 14 are aligned with their longitudinal axes 15 perpendicular to the axis of rotation R and each radially.

Wie insbesondere aus einer Zusammenschau der Fig. 2 und 3 deutlich wird, weist ein Formkörper 17 des Hartmaterialeinsatzes 16 an einer oberen Längskante eine Kopfschneide 18 und an einem axialen Ende eine Umfangsschneidkante 19 auf. Zur Herstellung der in der Fig. 5 dargestellten Bohrkrone 11 wird eine der Anzahl der Aufnahmen 14 entsprechende Anzahl der Hartmaterialeinsätzen 16 in die Aufnahmen 14 eingesetzt, und zwar derart, dass sich ein an einer Unterseite 20 des Formkörpers 17 ausgebildeter Haltefortsatz 21 in eine Bodenausnehmung 22 eines Aufnahmebodens 23 der Aufnahme 14 im Wesentlichen parallel zu der Rotationsachse 12 erstreckt.As in particular from a synopsis of the Figs. 2 and 3 As is clear, a shaped body 17 of the hard material insert 16 has a head cutting edge 18 on an upper longitudinal edge and a peripheral cutting edge 19 on an axial end. To produce the in the Fig. 5 A number of hard material inserts 16 corresponding to the number of receptacles 14 is inserted into the receptacles 14 in such a way that a holding extension 21 formed on an underside 20 of the shaped body 17 extends into a floor recess 22 a receiving base 23 of the receiving element 14 extends essentially parallel to the axis of rotation 12.

Weiterhin weist der Formkörper 17 an seiner Unterseite 20 einen weiteren, durch einen Schneidkantenfuß 24 der Umfangsschneidkante 19 gebildeten Fortsatz auf, der in eine zweite Bodenausnehmung 25 des Aufnahmebodens 23 eingreift, die im Bereich einer am äußeren radialen Ende der Aufnahme 14 ausgebildeten Öffnung 26 angeordnet ist, so dass die Umfangsschneidkante 19 einen radialen Überstand ausbildet, der eine Umfangsfläche 28 des Grundkörpers überragt.Furthermore, the molded body 17 has on its underside 20 a further extension formed by a cutting edge foot 24 of the peripheral cutting edge 19, which engages in a second bottom recess 25 of the receiving base 23, which is arranged in the area of an opening 26 formed at the outer radial end of the receiving 14 so that the circumferential cutting edge 19 forms a radial protrusion which projects beyond a circumferential surface 28 of the base body.

Wie insbesondere aus einer Zusammenschau der Fig. 1 bis 4 hervorgeht, werden zur Herstellung der in Fig. 5 dargestellten Bohrkrone 11 die Hartmaterialeinsätze 16 derart in die Aufnahmen 14 der axialen Endfläche 13 des Bohrkopfs 10 eingesetzt, dass die Hartmaterialeinsätze 16 zwischen einem Flankenabschnitt 29 und einem gegenüberliegenden Gegenflankenabschnitt 30 der Aufnahmen 14, die im vorliegenden Fall parallel zur Längsachse 15 der Aufnahmen 14 verlaufen, aufgenommen sind. Dabei sind die Hartmaterialeinsätze 16 mit einer Vorderseite 31 benachbart dem Flankenabschnitt 29 und mit einer Rückseite 32 benachbart dem Gegenflankenabschnitt 30 angeordnet.As in particular from a synopsis of the Figs. 1 to 4 are used to produce the in Fig. 5 the drill bit 11 shown, the hard material inserts 16 are inserted into the receptacles 14 of the axial end surface 13 of the drill head 10 in such a way that the hard material inserts 16 between a flank section 29 and an opposing counter-flank section 30 of the receptacles 14, which in the present case run parallel to the longitudinal axis 15 of the receptacles 14, are included. The hard material inserts 16 are arranged with a front side 31 adjacent to the flank section 29 and with a rear side 32 adjacent to the counter flank section 30.

An der Rückseite 32 sind die Hartmaterialeinsätze 16 mit einer an einen Rücksprung 33 anschließend ausgebildeten Ausnehmung 40 versehen, die gegenüberliegend einer im Gegenflankenabschnitt 30 ausgebildeten Ausnehmung 34 angeordnet ist, wobei die Ausnehmungen 40, 34 im vorliegenden Fall derart komplementär ausgebildet sind, dass die Ausnehmungen 40 und 34 sich zumindest bereichsweise zu einer bohrungsförmigen Ausnehmung ergänzen, die zumindest teilweise einen Aufnahmeraum für einen Materialsteg 35, wie in Fig. 6 dargestellt, oder einen Materialsteg 36, wie in Fig. 7 dargestellt, ausbildet.On the rear side 32, the hard material inserts 16 are provided with a recess 40 formed following a recess 33, which is arranged opposite a recess 34 formed in the counter-flank section 30, the recesses 40, 34 in the present case being designed complementary in such a way that the recesses 40 and 34 complement each other at least in some areas to form a bore-shaped recess which at least partially provides a receiving space for a material web 35, as in FIG Fig. 6 shown, or a material web 36, as in Fig. 7 illustrated, trains.

Die Ausbildung des Materialstegs 35 erfolgt ausgehend von der in Fig. 4 dargestellten Konfiguration, bei der die Hartmaterialeinsätze 16 in die Aufnahmen 14 eingesetzt sind und sich die Ausnehmungen 40 in den Hartmaterialeinsätzen 16 gegenüberliegend den Ausnehmungen 34 in den Gegenflankenabschnitten 30 der Aufnahmen 14 befinden, derart, dass durch eine punktförmige Auftragsschweißung, bei der Schweißmaterial 37 in die Ausnehmung 34 eingebracht und mit dem Gegenflankenabschnitt 30 der Ausnehmung 14 verschweißt wird, der Materialsteg 35 derart ausgebildet wird, dass sich dieser von der Ausnehmung 34 in dem Gegenflankenabschnitt 30 bis in die Ausnehmung 40 der Hartmaterialeinsätze 16 hinein erstreckt. Dabei wird zwischen dem Schweißmaterial 37 und dem Grundkörper 14 eine stoffschlüssige Verbindung ausgebildet. Der sich bei der Auftragsschweißung aus dem Schweißmaterial bildende Materialsteg 35 greift formschlüssig in die Ausnehmung 40 in den Hartmaterialeinsätzen 14 ein, ohne dass eine stoffschlüssige Verbindung erfolgt. Je nach Dimensionierung des den Materialsteg 35 ausbildenden Schweißmaterials 37 kann eine Druckkraft von dem Materialsteg 35 auf die Hartmaterialeinsätze 16 ausgeübt werden, die dazu führt, dass sich die Vorderseiten 31 der Hartmaterialeinsätze 16 kraftschlüssig an die Flankenabschnitte 29 der im Grundkörper 14 ausgebildeten Aufnahmen 14 anlegen und somit eine exakt definierte Relativanordnung der Hartmaterialeinsätze 16 zur Erzielung einer entsprechend exakt definierten Schneidengeometrie auf der axialen Endfläche 13 realisierbar ist.The formation of the material web 35 is based on the in Fig. 4 illustrated configuration in which the hard material inserts 16 in the Recesses 14 are inserted and the recesses 40 in the hard material inserts 16 are located opposite the recesses 34 in the counter-flank sections 30 of the receptacles 14, in such a way that by a point-like build-up weld in which the welding material 37 is introduced into the recess 34 and with the counter-flank section 30 of the recess 14 is welded, the material web 35 is formed such that it extends from the recess 34 in the counter-flank section 30 into the recess 40 of the hard material inserts 16. A material connection is formed between the welding material 37 and the base body 14. The material web 35 which is formed from the welding material during the build-up welding engages in a form-fitting manner in the recess 40 in the hard material inserts 14, without a material connection taking place. Depending on the dimensioning of the welding material 37 forming the material web 35, a compressive force can be exerted by the material web 35 on the hard material inserts 16, which leads to the front sides 31 of the hard material inserts 16 frictionally resting against the flank sections 29 of the receptacles 14 formed in the base body 14 thus an exactly defined relative arrangement of the hard material inserts 16 to achieve a correspondingly precisely defined cutting edge geometry on the axial end surface 13 can be realized.

Insbesondere in dem Fall, wenn die Aufprägung der sich aus der Auftragsschweißung ergebenden, auf die Hartmaterialeinsätze 16 wirkenden Druckkraft über einen möglichst gleichmäßigen Flächenkontakt auf die Hartmaterialeinsätze 16 erfolgen soll, ist es vorteilhaft, wenn, wie im Fall des Materialstegs 36, der Materialsteg 36 nicht ausschließlich aus dem Schweißmaterial 37 gebildet ist, sondern zur Ausbildung einer definierten Kontaktkontur 38, die der Ausnehmung 40 im Formkörper 17 der Hartmaterialeinsätze 16 angepasst ist, ein Anschlussstück 39 aus einem schweißbaren Material in die Ausnehmung 40 des Formkörpers 17 eingreift.In particular in the case when the imprinting of the pressure force resulting from the build-up welding and acting on the hard material inserts 16 is to take place via the most uniform surface contact possible on the hard material inserts 16, it is advantageous if, as in the case of the material web 36, the material web 36 is not is formed exclusively from the welding material 37, but to form a defined contact contour 38, which is adapted to the recess 40 in the molded body 17 of the hard material inserts 16, a connector 39 made of a weldable material engages in the recess 40 of the molded body 17.

Das Anschlussstück 39 fungiert somit nicht nur als formschlüssiger Eingriffskörper, sondern auch als Krafteinleitung zur definierten Übertragung der durch die Auftragsschweißung generierten Druckkraft auf die Hartmaterialeinsätze 16.The connection piece 39 thus not only functions as a form-fitting engagement body, but also as a force introduction for the defined transmission of the compressive force generated by the build-up welding to the hard material inserts 16.

Bei der in Fig. 9 dargestellten Bohrkrone 41 ist ein Bohrkopf 42 mit Hartmaterialeinsätzen 43 versehen, die in zylinderförmig ausgebildeten Aufnahmen 44 aufgenommen sind, wobei die Hartmaterialeinsätze 43 einen im Wesentlichen komplementär zur Aufnahme 44 ausgebildeten, in die Aufnahme 44 eingesetzten Haltefortsatz 45 aufweisen. Fig. 10 zeigt einen Hartmaterialeinsatz 43 in Einzeldarstellung.At the in Fig. 9 In the drill bit 41 shown, a drill head 42 is provided with hard material inserts 43 which are received in cylinder-shaped receptacles 44, the hard material inserts 43 having a holding extension 45 which is essentially complementary to receptacle 44 and inserted into receptacle 44. Fig. 10 shows a hard material insert 43 in detail.

Die Hartmaterialeinsätze 43 weisen eine erste Kopfschneidkante 46 und eine zweite Kopfschneidkante 47 auf, die parallel zueinander angeordnet sind und sich radial zur Rotationsachse R der Bohrkrone 41 erstrecken.The hard material inserts 43 have a first head cutting edge 46 and a second head cutting edge 47, which are arranged parallel to one another and extend radially to the axis of rotation R of the drill bit 41.

In den Hartmaterialeinsätzen 43 jeweils ausgebildete Ausnehmungen 48 weisen eine an einen Absatz zur Ausbildung eines Rücksprungs 49 anschließende Abflachung 50 auf, die sich bis zu den Kopfschneidkanten 46, 47 erstreckt und in einer zu den Kopfschneidkante 46, 47 rechtwinklig angeordneten Ebene angeordnet ist. Zwischen einem Flankenabschnitt 54 und der Abflachung 50 erstreckt sich ein durch eine Aufschweißung aus Schweißmaterial 37 auf dem Flankenabschnitt 54 ausgebildeter Materialsteg 53 formschlüssig in die Ausnehmung 48 hinein.Recesses 48 formed in each of the hard material inserts 43 have a flattening 50 adjoining a shoulder to form a recess 49, which extends as far as the head cutting edges 46, 47 and is arranged in a plane arranged at right angles to the head cutting edges 46, 47. Between a flank section 54 and the flattened area 50, a material web 53 formed by welding of welding material 37 on the flank section 54 extends into the recess 48 in a form-fitting manner.

Gegenüberliegend der Abflachung 50 und oberhalb des Haltefortsatzes 45 weisen die Hartmaterialeinsätze 43 einen sich in Richtung der Kopfschneidkanten 46, 47 erstreckenden, einen Gegenflankenabschnitt 51 überragenden radialen Überstand 52 auf.Opposite the flattened area 50 and above the holding extension 45, the hard material inserts 43 have a radial protrusion 52 which extends in the direction of the head cutting edges 46, 47 and projects beyond a counter-flank section 51.

Claims (16)

  1. A drill bit (11, 41) for the drilling, in particular the rotary percussive drilling, of a hole, in particular a tap hole of a melting furnace, the drill bit (11, 41) comprising a drill head (10, 42), which has at least one hard material insert (16, 43), and a base body (12) for connecting the drill bit to a driving element, the hard material insert (16, 43) being inserted into a seat (14, 44), which is formed in an axial end face (13) of the drill head (10, 42), in such a manner that at least a head cutting edge (18, 46, 47) of the hard material insert (16, 43) protrudes beyond the axial end face (13),
    characterized in that
    the seat (14, 44) has a flank portion (29, 54) and an opposite flank portion (30, 51) located opposite the flank portion, between which the hard material insert (16, 43) is disposed, the flank portion (29, 54), which is disposed opposite a recess (33, 49) formed in the hard material insert (16, 43), being provided with a material projection (35, 36, 53) which is at least partially made of a welding material (37), is bonded to the drill head (10, 42) via the welding material (37) and protrudes into the recess (33, 49) so as to establishing a form-fitting connection with the hard material insert (16, 43).
  2. The drill bit (11, 41) according to claim 1,
    characterized in that
    the material projection (35, 53) protruding into the recess (33, 49) of the hard material insert (16, 43) is made entirely of welding material (37).
  3. The drill bit (11, 41) according to claim 2,
    characterized in that
    the material projection (35, 53) is a weld spot.
  4. The drill bit (11) according to claim 2 or 3,
    characterized in that
    the material projection (35) at least partially fills both a clearance (40) formed adjacent to the recess in the hard material insert (16) and a clearance (34) formed in the opposite flank portion (29) of the seat (14).
  5. The drill bit (11) according to any one of the preceding claims,
    characterized in that
    the length of the seat (14) in the drill head (10) extends essentially radially with respect to an axis of rotation R of the drill head (10) and the seat (14) has an opening (26) at the radially outer end, the hard material insert (16), whose length extends in the same radial direction, being accommodated in the seat (14) in such a manner that the hard material insert (16) protrudes beyond a circumferential surface (28) of the drill head (10) by a protrusion (27) which extends radially with respect to the axis of rotation R.
  6. The drill bit (11) according to any one of the preceding claims,
    characterized in that
    the hard material insert (16) has at least one retaining extension (21) which is essentially parallel to the axis of rotation R of the drill head (10) and which engages into a bottom clearance (22) formed in a seat bottom (23) of the seat (14).
  7. The drill bit (11) according to claim 5 or 6,
    characterized in that
    the radial protrusion (27) of the hard material insert (16) forms a circumferential cutting edge (19) which extends essentially parallel to the axis of rotation R of the drill head (10).
  8. The drill bit (11) according to claim 7,
    characterized in that,
    starting from the head cutting edge (18), which protrudes beyond the axial end face (13) of the drill head (10), the circumferential cutting edge (19) extends beyond the seat bottom (23) of the seat (14) in such a manner that a cutting edge leg (24) of the circumferential cutting edge (19) is accommodated in a second bottom clearance (25) in the seat bottom (23) of the seat (14).
  9. The drill bit (11) according to any one of the preceding claims,
    characterized in that
    multiple hard material inserts (16), each inserted into a seat (14), are distributed across the circumference of the end face (13) of the drill head (10).
  10. The drill bit (11) according to claim 9,
    characterized in that
    at least two hard material inserts (16) have different radial lengths with respect to the axis of rotation R of the drill head (10) in such a manner that radially inner ends of the head cutting edges (18) have different distances from the axis of rotation R of the drill head (10).
  11. The drill bit (41) according to any one of claims 1 to 4,
    characterized in that
    the seat (44) is cylindrical, in particular a drill hole, and the hard material insert (43) has a retaining extension (45) which is essentially complementary to the seat (44) and inserted into the seat (44).
  12. The drill bit (41) according to claim 11,
    characterized in that
    the hard material insert (43) has a first and a second head cutting edge (46, 47) which are disposed parallel to each other and extend radially to the axis of rotation R of the drill bit (41).
  13. The drill bit (41) according to claim 11 or 12,
    characterized in that
    the clearance (48) formed in the hard material insert (43) has a flat portion (50) adjacent to a shoulder for forming the recess (49), said flat portion (50) extending as far as to a head cutting edge (46, 47).
  14. The drill bit (41) according to claim 13,
    characterized in that
    the flat portion (50) is disposed in a plane that is disposed at a right angle to the head cutting edge (46, 47).
  15. The drill bit (41) according to claim 14,
    characterized in that,
    opposite the flat portion (50) and above the retaining extension (45), the hard material insert (43) has a radial protrusion (52) which extends in the direction of the head cutting edge (46, 47) and protrudes beyond the opposite flank portion (51).
  16. The drill bit (41) according to any one of claims 11 to 15,
    characterized in that
    multiple hard material inserts (16, 43), each inserted into a seat (44), are distributed across the axial end face of the drill head (42).
EP16787756.2A 2016-10-10 2016-10-10 Drilling crown Active EP3523496B1 (en)

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JP (1) JP6785977B2 (en)
KR (1) KR102291684B1 (en)
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JP2019534406A (en) 2019-11-28
JP6785977B2 (en) 2020-11-18
WO2018068818A1 (en) 2018-04-19
RU2712994C1 (en) 2020-02-03
KR102291684B1 (en) 2021-08-20
CN110036175A (en) 2019-07-19
BR112019007179B1 (en) 2022-07-12
US20190277094A1 (en) 2019-09-12
US11306541B2 (en) 2022-04-19
BR112019007179A2 (en) 2019-06-25
KR20190062473A (en) 2019-06-05
CN110036175B (en) 2020-08-04
EP3523496A1 (en) 2019-08-14

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