EP1323496B1 - Core bit for ultrasonic drilling - Google Patents

Core bit for ultrasonic drilling Download PDF

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Publication number
EP1323496B1
EP1323496B1 EP02406074A EP02406074A EP1323496B1 EP 1323496 B1 EP1323496 B1 EP 1323496B1 EP 02406074 A EP02406074 A EP 02406074A EP 02406074 A EP02406074 A EP 02406074A EP 1323496 B1 EP1323496 B1 EP 1323496B1
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EP
European Patent Office
Prior art keywords
core bit
cylindrical tube
cover
bit according
amplitude
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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.)
Expired - Lifetime
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EP02406074A
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German (de)
French (fr)
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EP1323496A1 (en
Inventor
Adrian Kauf
Stefan Tichy
Walter Littmann
John Van Taack-Trakranen
Peter Alberg
Till Cramer
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Hilti AG
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Hilti AG
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Publication of EP1323496A1 publication Critical patent/EP1323496A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B24B1/04—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/08—Honing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/895—Having axial, core-receiving central portion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/895—Having axial, core-receiving central portion
    • Y10T408/8957—Having axial, core-receiving central portion and having stepped cutting edges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/896—Having product-receiving chamber

Definitions

  • the invention refers to a core bit rotating about the axis of symmetry with cutting or grinding bodies for the abrasive removal of mineral substrates such as rock, which has an axial ultrasonic excitation.
  • DE3812917 After DE3812917 has a, operated in a unspecified natural frequency, slot drill longitudinal openings in a drill bit on.
  • an ultrasound vibrator controllable with respect to the vibration pattern has a plurality of equidistant longitudinal slots in a cylindrical base body, whereby the residual webs act as pure longitudinal oscillators.
  • DE4444853 which is based on the preamble of claim 1, has a core bit on a cylinder tube and a frontally connected lid, which is excited in the center of the axis with a natural frequency to axial bending oscillations.
  • an abrasive disc excited to bending vibrations with radial abrasive bodies of differing thickness has a concentric jump in the cross section on a geometrically undefined position.
  • the object of the invention is the realization of a core bit of larger diameter with a central, axial ultrasonic excitation oscillation robust excitation behavior for axial longitudinal vibrations in the cylinder tube.
  • Another aspect is the increase in the axial vibration amplitude at the axial end of the cylinder tube.
  • a core bit for abrasive removal of mineral substrates with a front side with cutting or grinding cylindrical cylinder barrel and a frontally connected lid, which has a Einsteckende in the axial center for receiving in an at least rotating tool device, with respect to a reference excitation frequency to form a Whole-numbered number of amplitude Schwungungsbäuchen the concentric bending vibration dimensioned cover, wherein the cylinder tube is dimensioned with respect to the desired excitation frequency to form an integral number of amplitude Schwbeddlingsbäuchen the axial longitudinal vibrations.
  • the core bit in the cylinder tube exclusively in the axial region of the axial Longitudinaleigenamplituschwungungsknoten circumferentially equidistantly arranged, along the axis of symmetry oriented, elongated material recesses.
  • the lid in the vicinity of the position of an amplitude vibration node circle of a bending natural vibration on a concentric jump in the cross section.
  • the jump in cross section at the location of an amplitude oscillation node circle in the cover serves to amplitude-transform the bending oscillation with a significant increase in the amplitude of the oscillation belly occurring at the base of the cylinder tube, which excites axial longitudinal oscillations with significantly increased amplitude in the cylinder tube, which are thus stimulated with sufficient robustness to vibration.
  • the geometric position of this amplitude node circuit is in the vicinity of the position of the amplitude vibration nodes of the concentric radial waves, wherein it a radial cross-section jump leads to a slight shift of the position of the amplitude vibration nodes.
  • this is preferably dimensioned to a total of two or three amplitude vibration nodes with respect to the reference excitation frequency of, for example, 20 kHz.
  • the interposed cylindrical shells are substantially no longer circumferentially coupled together with vibration, whereby the excitation of parasitic, energy-consuming, radial modes is suppressed.
  • the core bit on, a slender longitudinal oscillator corresponding natural frequency which differs from that of a cylinder tube. The additional energy leads to axial longitudinal vibrations with significantly increased amplitude, which are thus stimulated sufficient vibrational robustness.
  • ⁇ c / f
  • the elongated material recesses are oriented axially parallel, whereby no parasitic shear modes are excited.
  • the elongated material recesses are formed as longitudinal slots, whereby the radial modes are completely suppressed.
  • the core bit on a cross-sectional jump and elongated material recesses resulting in a further increase in the amplitude by the superposition of both individual effects.
  • cover projection radially over the cylinder tube over is in an advantageous variant, not further associated with the lid, cover projection radially over the cylinder tube over, further advantageously by a quarter of the wavelength of the bending natural vibration, whereby the proportion of stimulated in the cylinder tube radial modes further suppressible is.
  • a coring bit 1 of large diameter with a frontally occupied with grinding wheels 2 thin-walled cylinder tube 3 and an opposite frontally connected, thin-walled cover 4, which in the symmetry and rotation axis A a plug-in 5 for positive reception in a non-illustrated rotating Tool on.
  • the part of a schematically indicated electroacoustic actuator 6, which induces an axial ultrasonic vibration is arranged in the form of a piezoconverter inductively supplied with voltage via a rotary transformer.
  • the lid 4 has at the radial location of an amplitude oscillation node circle 7 of a bending natural oscillation 8 with an amplitude maximum at the axis of symmetry A and at the base of the cylinder tube 3 a concentric cross-sectional jump 9, wherein forms an amplitude increase at the base.
  • the cylinder tube 3 are exclusively in the axial region x of the axial Longitudinaleigenamplituschwschwotenungsknoten 10 with a strain maximum at both end faces circumferentially equidistantly arranged, axially parallel to the axis of symmetry A.
  • On the lid 4 is a cover projection 12 radially by a quarter of the wavelength of the bending natural vibration 8 via the cylinder tube 3 via.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Drilling Tools (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Catalysts (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Catching Or Destruction (AREA)

Abstract

The cylindrical tube (3) is dimensioned to exhibit a whole number of antinodes along its axial length, when subjected to a given excitation frequency.

Description

Die Erfindung bezeichnet eine um die Symmetrieachse drehend angetriebene Kernbohrkrone mit Schneid- oder Schleifkörpern zum abrasiven Abtragen von mineralischen Untergründen wie Gestein, welche eine axiale Ultraschallanregung aufweist.The invention refers to a core bit rotating about the axis of symmetry with cutting or grinding bodies for the abrasive removal of mineral substrates such as rock, which has an axial ultrasonic excitation.

Üblicherweise bestehen topfförmig ausgebildete Kernbohrkronen aus einem stirnseitig mit Schleifkörpern besetzten Zylinderrohr und einem gegenüberliegend stirnseitig verbundenen Deckel, welcher in der Achsmitte ein Einsteckende zur Aufnahme in ein zumindest drehendes Werkzeuggerät aufweist. Bei einer üblichen Überlagerung mit Ultraschall im Bereich von 20 kHz bis 200 kHz bei einer Eigenfrequenz der Kernbohrkrone wird diese von einem Aktor im Einsteckende zentral in der Achsmitte angeregt. Derartige Kernbohrkronen sind nur bis zu kleinen Durchmessern des Zylinderrohres von etwa 100 mm realisierbar, da beim Eingreifen in den Untergrund, bedingt durch das bei grösseren Durchmessern grössere Verhältnis zum Anregungsdurchmesser des Aktors, keine schwingungsrobusten, d.h. auch bei hoher Dämpfung über eine zum abrasiven Abbau benötigte Axialkraft auf das Zylinderrohr, in diesem hinreichend stabile, axiale Longitudinalschwingungen anregbar sind.Usually there are cup-shaped core bits from a front side occupied with grinding wheels cylinder barrel and an opposite frontally connected lid having a Einsteckende in the center of the axle for receiving in an at least rotating tool. In a conventional superimposition with ultrasound in the range of 20 kHz to 200 kHz at a natural frequency of the core bit this is excited by an actuator in the insertion centrally in the center of the axle. Such Kernbohrkronen are only up to small diameters of the cylinder tube of about 100 mm feasible, since when intervened in the ground, due to the greater diameter at larger diameters to the excitation diameter of the actuator, no Schwingingrobusten, i. Even with high attenuation via an axial force required for abrasive degradation on the cylinder tube, in this sufficiently stable, axial longitudinal vibrations can be excited.

Nach der DE3812917 weist ein, in einer nicht näher bezeichneten Eigenfrequenz betriebener, Schlitzbohrer längs verlaufende Öffnungen in einer Bohrkrone auf. Zudem weist nach der DE3635806 ein bezüglich des Schwingungsbildes steuerbarer Ultraschallvibrator mehrere äquidistante Längsschlitze in einem zylinderförmigen Grundkörper auf, wodurch die Reststege als reine Longitudinalschwinger wirken.After DE3812917 has a, operated in a unspecified natural frequency, slot drill longitudinal openings in a drill bit on. In addition, after the DE3635806 an ultrasound vibrator controllable with respect to the vibration pattern has a plurality of equidistant longitudinal slots in a cylindrical base body, whereby the residual webs act as pure longitudinal oscillators.

Nach der DE4444853 , die dem Oberbegriff von Anspruch 1 zugrunde liegt, weist eine Kernbohrkrone ein Zylinderrohr und einen stirnseitig verbundenen Deckel auf, welcher in der Achsmitte mit einer Eigenfrequenz zu axialen Biegeschwingungen angeregt wird. Zudem weist eine zu Biegeschwingungen angeregte Schleifscheibe mit radialen Schleifkörpern abweichender Dicke einen konzentrischen Querschnittssprung an einer geometrisch undefinierten Lage auf.After DE4444853 , which is based on the preamble of claim 1, has a core bit on a cylinder tube and a frontally connected lid, which is excited in the center of the axis with a natural frequency to axial bending oscillations. In addition, an abrasive disc excited to bending vibrations with radial abrasive bodies of differing thickness has a concentric jump in the cross section on a geometrically undefined position.

Zudem weist nach der DE19758243 ein Ultraschallwandler zur Erhöhung der Richtwirkung eines flächig abgestrahlten Schallfeldes eine Biegeschwingplatte auf, welche konzentrische Querschnittssprünge aufweist, die an Amplitudenschwingungsknotenkreisen angeordnet sind.In addition, after the DE19758243 an ultrasonic transducer to increase the directivity of a surface radiated sound field on a bending swing plate, which concentric Has cross-sectional jumps, which are arranged on amplitude vibration node circuits.

Die Aufgabe der Erfindung besteht in der Realisierung einer Kernbohrkrone grösseren Durchmessers mit einem bei zentraler, axialer Ultraschallanregung schwingungsrobusten Anregungsverhalten für axiale Longitudinalschwingungen im Zylinderrohr. Ein weiterer Aspekt besteht in der Erhöhung der axialen Schwingungsamplitude am axialen Ende des Zylinderrohres.The object of the invention is the realization of a core bit of larger diameter with a central, axial ultrasonic excitation oscillation robust excitation behavior for axial longitudinal vibrations in the cylinder tube. Another aspect is the increase in the axial vibration amplitude at the axial end of the cylinder tube.

Die Aufgabe wird durch die Merkmale des unabhängigen Anspruchs gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is solved by the features of the independent claim. Advantageous developments emerge from the subclaims.

Im wesentlichen weist eine Kernbohrkrone zum abrasiven Abtragen von mineralischen Untergründen mit einem stirnseitig mit Schneid- oder Schleifkörpern besetzten Zylinderrohr und einem gegenüberliegend stirnseitig verbundenen Deckel, welcher in der Achsmitte ein Einsteckende zur Aufnahme in ein zumindest drehendes Werkzeuggerät aufweist, einen bezüglich einer Sollanregungsfrequenz zur Ausbildung einer ganzzahligen Anzahl von Amplitudenschwinungsbäuchen der konzentrischen Biegeschwingung dimensionierten Deckel auf, wobei das Zylinderrohr bezüglich der Sollanregungsfrequenz zur Ausbildung einer ganzzahligen Anzahl von Amplitudenschwinungsbäuchen der axialen Longitudinalschwingungen dimensioniert ist.Essentially, a core bit for abrasive removal of mineral substrates with a front side with cutting or grinding cylindrical cylinder barrel and a frontally connected lid, which has a Einsteckende in the axial center for receiving in an at least rotating tool device, with respect to a reference excitation frequency to form a Whole-numbered number of amplitude Schwungungsbäuchen the concentric bending vibration dimensioned cover, wherein the cylinder tube is dimensioned with respect to the desired excitation frequency to form an integral number of amplitude Schwbenungsbäuchen the axial longitudinal vibrations.

Dabei weist die Kernbohrkrone im Zylinderrohr ausschließlich im Axialbereich der axialen Longitudinaleigenamplitudenschwingungsknoten umfänglich äquidistant angeordnete, längs zur Symmetrieachse orientierte, längliche Materialausnehmungen auf.In this case, the core bit in the cylinder tube exclusively in the axial region of the axial Longitudinaleigenamplituschwungungsknoten circumferentially equidistantly arranged, along the axis of symmetry oriented, elongated material recesses.

Durch die Kombination der resonant bestimmten Einzelkomponenten in Form von Deckel und Zylinderrohr ergibt sich ein bei axialer Ultraschallanregung schwingungsrobustes Anregungsverhalten der Kernbohrkrone.The combination of the resonantly determined individual components in the form of cover and cylinder tube results in a vibrationally robust excitation behavior of the core bit in the case of axial ultrasonic excitation.

Vorteilhaft weist der Deckel in der Nähe der Position eines Amplitudenschwingungsknotenkreises einer Biegeeigenschwingung einen konzentrischen Querschnittssprung auf.Advantageously, the lid in the vicinity of the position of an amplitude vibration node circle of a bending natural vibration on a concentric jump in the cross section.

Der Querschnittssprung an der Stelle eines Amplitudenschwingungsknotenkreises im Deckel dient zur Amplitudentransformation der Biegeschwingung mit einer signifikanten Erhöhung der Amplitude des am Ansatz des Zylinderrohres auftretenden Schwingungsbauches, welcher im Zylinderrohr axiale Longitudinalschwingungen mit signifikant erhöhter Amplitude anregt, die somit hinreichend schwingungsrobust angeregt sind. Die geometrische Lage dieses Amplitudenschwingungsknotenkreises liegt in der Nähe der Position der Amplitudenschwingungsknoten der konzentrisch stehenden Radialwellen, wobei es bei einem radialen Querschnittssprung zu einer geringfügigen Verschiebung der Lage der Amplitudenschwingungsknoten kommt.The jump in cross section at the location of an amplitude oscillation node circle in the cover serves to amplitude-transform the bending oscillation with a significant increase in the amplitude of the oscillation belly occurring at the base of the cylinder tube, which excites axial longitudinal oscillations with significantly increased amplitude in the cylinder tube, which are thus stimulated with sufficient robustness to vibration. The geometric position of this amplitude node circuit is in the vicinity of the position of the amplitude vibration nodes of the concentric radial waves, wherein it a radial cross-section jump leads to a slight shift of the position of the amplitude vibration nodes.

Bei praktisch relevanten Kernbohrkronen wird diese vorzugsweise auf insgesamt zwei oder drei Amplitudenschwingungsknoten bezüglich der Sollanregungsfrequenz von bspw. 20 kHz dimensioniert. Ein weiter vorteilhaftes Dickenverhältnis der radial äusseren zu den radial inneren Seiten des Querschnittssprungs von 0,2 bis 0,4 bestimmt für die Lage des Querschnittssprunges am von Innen zugeordneten Knoten einen relativen Radiusbereich nach der untenstehenden Tabelle, wobei das Optimum in Klammern steht: Amplitudenschwingungsknoten insgesamt Nr. des Knotens am Querschnittssprung relativer Radius des Querschnittssprungs Dickenverhältnis am Querschnittssprung 3 1 0,25 - 0,40 (0,30) 0,2 - 0,4 (0,3) 3 2 0,50 - 0,70 (0,60) 0,2 - 0,4 (0,33) 2 2 0,70 - 0,90 (0,82) 0,2 - 0,4 (0,33) In practically relevant core drill bits, this is preferably dimensioned to a total of two or three amplitude vibration nodes with respect to the reference excitation frequency of, for example, 20 kHz. A further advantageous thickness ratio of the radially outer to the radially inner sides of the cross-sectional jump of 0.2 to 0.4 determined for the position of the cross-sectional jump at the internally associated nodes a relative radius range according to the table below, the optimum being in parentheses: Total amplitude vibration nodes No of the knot at the cross-section crack relative radius of the cross-sectional jump Thickness ratio at the cross-section jump 3 1 0.25 - 0.40 (0.30) 0.2 - 0.4 (0.3) 3 2 0.50 - 0.70 (0.60) 0.2-0.4 (0.33) 2 2 0.70 - 0.90 (0.82) 0.2-0.4 (0.33)

Durch die längs zur Symmetrieachse länglichen Materialausnehmungen an den Longitudinaleigenamplitudenschwingungsknoten sind die dazwischen angeordneten Zylinderschalen im wesentlichen nicht mehr umfänglich miteinander schwingungsgekoppelt, wodurch die Anregung von parasitären, Energie verbrauchenden, Radialmoden unterdrückt wird. Durch die im Bereich der Longitudinaleigenschwingungsbäuche umfänglich miteinander schwingungsgekoppelten Zylinderschalen weist die Kernbohrkrone eine, einem schlanken Longitudinalschwinger entsprechende, Eigenfrequenz auf, welche sich von der eines Zylinderrohres unterscheidet. Die zusätzliche Energie führt zu axialen Longitudinalschwingungen mit signifikant erhöhter Amplitude, die somit hinreichend schwingungsrobust angeregt sind. Die zur Bestimmung des Axialbereichs der Materialausnehmungen benötigte Wellenlänge λ der Longitudinaleigenschwingung bei einer Frequenz f ist bestimmt mit λ = c / f wobei sich die Longitudinalwellengeschwindigkeit c über c = Quadratwurzel (E / p) aus dem Elastizitätsmodul E und der Dichte p ergibt. Vorteilhaft ergibt sich für ein als λ- Schwinger ausgebildetes Zylinderrohr eine mittlere Axialposition der Materialausnehmungen von 1/4 und/oder 3/4 seiner relative Länge.Due to the longitudinally symmetrical to the axis of material recesses on the Longitudinaleigenamplituschwingsnode the interposed cylindrical shells are substantially no longer circumferentially coupled together with vibration, whereby the excitation of parasitic, energy-consuming, radial modes is suppressed. Due to the circumferentially oscillating in the Longitudinalenigenschwingungsbäuche circumferentially coupled to each cylinder shells, the core bit on, a slender longitudinal oscillator corresponding natural frequency, which differs from that of a cylinder tube. The additional energy leads to axial longitudinal vibrations with significantly increased amplitude, which are thus stimulated sufficient vibrational robustness. The wavelength λ of the longitudinal natural vibration at a frequency f required to determine the axial region of the material recesses is determined by λ = c / f, where the longitudinal wave velocity c is over c = square root (E / p) from the elastic modulus E and the density p. Advantageously, for a cylinder tube designed as a λ-oscillator, a mean axial position of the material recesses of 1/4 and / or 3/4 of its relative length is obtained.

Vorteilhaft sind die länglichen Materialausnehmungen achsparallel orientiert, wodurch keine parasitären Schermoden angeregt werden.Advantageously, the elongated material recesses are oriented axially parallel, whereby no parasitic shear modes are excited.

Vorteilhaft sind die länglichen Materialausnehmungen als Längsschlitze ausgebildet, wodurch die Radialmoden vollständig unterdrückt werden.Advantageously, the elongated material recesses are formed as longitudinal slots, whereby the radial modes are completely suppressed.

Vorteilhaft weist die Kernbohrkrone einen Querschnittssprung und längliche Materialausnehmungen auf, wodurch sich eine weitere Erhöhung der Amplitude durch die Überlagerung beider Einzeleffekte ergibt.Advantageously, the core bit on a cross-sectional jump and elongated material recesses, resulting in a further increase in the amplitude by the superposition of both individual effects.

Neben einem üblicherweise direkt am ansetzenden Zylinderrohr endenden Deckel steht bei einer vorteilhaften Variante ein, im weiteren nicht dem Deckel zugehöriger, Deckelüberstand radial über das Zylinderrohr über, weiter vorteilhaft um ein Viertel der Wellenlänge der Biegeeigenschwingung, wodurch der Anteil der im Zylinderrohr angeregten Radialmoden weiter unterdrückbar ist.In addition to a usually ending directly on the attaching cylinder tube cover is in an advantageous variant, not further associated with the lid, cover projection radially over the cylinder tube over, further advantageously by a quarter of the wavelength of the bending natural vibration, whereby the proportion of stimulated in the cylinder tube radial modes further suppressible is.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit der Darstellung einer Kernbohrkrone.The invention will be explained in more detail with respect to an advantageous embodiment with the representation of a core bit.

Nach der Darstellung im Teilschnitt weist eine Kernbohrkrone 1 grossen Durchmessers mit einem stirnseitig mit Schleifkörpern 2 besetzten dünnwandigen Zylinderrohr 3 und einem gegenüberliegend stirnseitig verbundenen, dünnwandigen Deckel 4, welcher in der Symmetrie- und Drehachse A ein Einsteckende 5 zur formschlüssigen Aufnahme in ein nicht dargestelltes drehendes Werkzeuggerät auf. Im Einsteckende 5 ist der, eine axiale Ultraschallschwingung anregende, Teil eines schematisch angedeuteten elektroakustischen Aktors 6 in Form eines über einen Drehtransformator induktiv mit Spannung versorgten Piezokonverters angeordnet. Der Deckel 4 weist an der radialen Stelle eines Amplitudenschwingungsknotenkreises 7 einer Biegeeigenschwingung 8 mit einem Amplitudenmaximum an der Symmetrieachse A und am Ansatz des Zylinderrohrs 3 einen konzentrischen Querschnittssprung 9 auf, wobei sich am Ansatz eine Amplitudenerhöhung ausbildet. Im Zylinderrohr 3 sind ausschliesslich im Axialbereich x der axialen Longitudinaleigenamplitudenschwingungsknoten 10 mit einem Dehnungsmaximum an beiden Stirnflächen umfänglich äquidistant angeordnete, achsparallel zur Symmetrieachse A orientierte, längliche Materialausnehmungen 11 in Form von Längsschlitzen vorhanden, welche bei 1/4 und/oder 3/4 der relativen Länge positioniert sind. Am Deckel 4 steht ein Deckelüberstand 12 radial um ein Viertel der Wellenlänge der Biegeeigenschwingung 8 über das Zylinderrohr 3 über.As shown in partial section, a coring bit 1 of large diameter with a frontally occupied with grinding wheels 2 thin-walled cylinder tube 3 and an opposite frontally connected, thin-walled cover 4, which in the symmetry and rotation axis A a plug-in 5 for positive reception in a non-illustrated rotating Tool on. In the insertion end 5, the part of a schematically indicated electroacoustic actuator 6, which induces an axial ultrasonic vibration, is arranged in the form of a piezoconverter inductively supplied with voltage via a rotary transformer. The lid 4 has at the radial location of an amplitude oscillation node circle 7 of a bending natural oscillation 8 with an amplitude maximum at the axis of symmetry A and at the base of the cylinder tube 3 a concentric cross-sectional jump 9, wherein forms an amplitude increase at the base. In the cylinder tube 3 are exclusively in the axial region x of the axial Longitudinaleigenamplituschwschwotenungsknoten 10 with a strain maximum at both end faces circumferentially equidistantly arranged, axially parallel to the axis of symmetry A. oriented, elongated material recesses 11 in the form of longitudinal slots present, which are positioned at 1/4 and / or 3/4 of the relative length. On the lid 4 is a cover projection 12 radially by a quarter of the wavelength of the bending natural vibration 8 via the cylinder tube 3 via.

Claims (6)

  1. Core bit for abrasive cutting of mineral components, comprising a cylindrical tube (3) provided at one end surface thereof with cutting or abrasive bodies (2), and a cover (4) provided at an opposite end surface of the cylindrical tube (3) and secured thereto and having, along a central axis thereof, a shank (5) to be received in an at least rotary power tool, which cover is dimensioned, with respect to a set excitation frequency, for forming a whole number of maximum amplitude oscillations of a concentric flexural oscillation,
    characterised in that the cylindrical tube (3) is dimensioned, with respect to said set excitation frequency, for forming a whole number of maximum oscillations of axial longitudinal oscillations, and in that that the cylindrical tube (3) has, solely in an axial region (x) of axial longitudinal amplitude oscillation nodes (10), a plurality of elongate recesses (11) orientated along the central axis (A) and arranged equidistantly over the circumference of the cylindrical tube (3).
  2. Core bit according to claim 1, characterised in that the cover (4) has a concentric projection (9), in the vicinity of the location of a nodal circle (7) of amplitude oscillations of the concentric flexural oscillation (8),
  3. Core bit according to claim 1 or 2, characterised in that the elongate recesses (11) extend parallel to the central axis.
  4. Core bit according to any one of claims 1 to 3, characterised in that the elongate recesses (11) are formed as elongate slots.
  5. Core bit according to any one of the preceding claims, characterised in that both the projection (9) and elongate recesses (11) are provided, the latter being positioned at one-quarter and/or three-quarters of the relative length of the cylindrical tube (3).
  6. Core bit according to any one of the preceding claims, characterised in that the cover (4) has a collar (12) projecting radially beyond the cylindrical tube (3) and the collar (12) optionally projects by one-quarter of the wavelength of the flexural oscillation (8).
EP02406074A 2001-12-20 2002-12-09 Core bit for ultrasonic drilling Expired - Lifetime EP1323496B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10162636 2001-12-20
DE10162636A DE10162636A1 (en) 2001-12-20 2001-12-20 Ultraschallkernbohrkrone

Publications (2)

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EP1323496A1 EP1323496A1 (en) 2003-07-02
EP1323496B1 true EP1323496B1 (en) 2008-02-13

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EP02406074A Expired - Lifetime EP1323496B1 (en) 2001-12-20 2002-12-09 Core bit for ultrasonic drilling

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US (1) US6948574B2 (en)
EP (1) EP1323496B1 (en)
JP (1) JP4319400B2 (en)
AT (1) ATE385876T1 (en)
DE (2) DE10162636A1 (en)

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Also Published As

Publication number Publication date
US6948574B2 (en) 2005-09-27
DE10162636A1 (en) 2003-07-03
JP4319400B2 (en) 2009-08-26
ATE385876T1 (en) 2008-03-15
US20030146024A1 (en) 2003-08-07
JP2003200415A (en) 2003-07-15
EP1323496A1 (en) 2003-07-02
DE50211664D1 (en) 2008-03-27

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