EP1323496A1 - Core bit for ultrasonic drilling - Google Patents

Core bit for ultrasonic drilling Download PDF

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Publication number
EP1323496A1
EP1323496A1 EP02406074A EP02406074A EP1323496A1 EP 1323496 A1 EP1323496 A1 EP 1323496A1 EP 02406074 A EP02406074 A EP 02406074A EP 02406074 A EP02406074 A EP 02406074A EP 1323496 A1 EP1323496 A1 EP 1323496A1
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EP
European Patent Office
Prior art keywords
drill bit
core drill
cylinder tube
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.)
Granted
Application number
EP02406074A
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German (de)
French (fr)
Other versions
EP1323496B1 (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 relates to a drive that rotates about the axis of symmetry Core drill bit with cutting or grinding tools for the abrasive removal of mineral Substrates such as rock, which has an axial ultrasound excitation.
  • Pot-shaped core drill bits usually consist of an end face Grinding bodies occupied cylinder tube and an opposite end face connected Cover, which has an insertion end in the middle of the axis for at least one has rotating tool device. With a usual superposition with ultrasound in the Range from 20 kHz to 200 kHz at a natural frequency of the core bit, this is from an actuator in the insertion end centrally excited in the center of the axis.
  • Such core bits can only be realized up to small diameters of the cylinder tube of about 100 mm, because when engaging in the subsoil, due to the larger with larger diameters Relationship to the excitation diameter of the actuator, no robust vibration, i.e. also with high damping via an axial force required for abrasive degradation on the Cylinder tube in which sufficiently stable, axial longitudinal vibrations can be excited.
  • DE3812917 has a natural frequency, not specified in more detail operated, slot drill longitudinal openings in a drill bit. Also points According to DE3635806, an ultrasonic vibrator that can be controlled with respect to the vibration pattern several equidistant longitudinal slots in a cylindrical base body, whereby the Remaining webs act as pure longitudinal oscillators.
  • a core drill bit has a cylinder tube and an end face connected lid, which is axial in the center of the axis with a natural frequency Bending vibrations is excited.
  • one stimulates bending vibrations Grinding wheel with radial grinding wheels of different thickness a concentric Cross-sectional jump at a geometrically undefined location.
  • an ultrasonic transducer to increase the directivity of a flat radiated sound field on a bending vibrating plate, which is concentric Has cross-sectional jumps arranged on amplitude oscillation node circles are.
  • the object of the invention is to implement a larger core drill bit Diameter with a robust vibration with central, axial ultrasonic excitation Excitation behavior for axial longitudinal vibrations in the cylinder barrel.
  • Another Aspect consists in increasing the axial vibration amplitude at the axial end of the Cylinder tube.
  • a core bit for the abrasive removal of mineral Surfaces with a cylinder tube with cutting or grinding bodies on the front and an oppositely connected front cover, which in the middle of the axis Has insertion end for receiving in an at least rotating tool, one with respect to a target excitation frequency to form an integer number of Amplitude antinodes of the concentric bending vibration dimensioned Cover on, characterized in that the cylinder tube with respect to the Target excitation frequency for forming an integer number of Amplitude antinodes of the axial longitudinal vibrations is dimensioned.
  • the lid advantageously has a position close to one Amplitude vibration node circle of a bending natural vibration a concentric Cross-sectional jump on.
  • the cross-sectional jump at the location of an amplitude vibration node circle in the cover is used for the amplitude transformation of the bending vibration with a significant increase the amplitude of the antinode occurring at the base of the cylinder tube, which in the cylinder barrel has axial longitudinal vibrations with a significantly increased amplitude stimulates, which are thus sufficiently vibrationally robust.
  • the geometric location this amplitude vibration node circle is close to the position of the Amplitude vibration node of the concentrically standing radial waves, it being at a radial cross-sectional jump to a slight shift in the location of the Amplitude vibration node is coming.
  • this is preferably dimensioned to a total of two or three amplitude vibration nodes with respect to the target 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 from 0.2 to 0.4 determines a relative radius range for the position of the cross-sectional jump at the node assigned from the inside according to the table below, the optimum being in parentheses: Total amplitude node No.
  • a core drill bit has a cylinder tube with grinding wheels on the front and one opposite frontally connected cover, which has an insertion end in the middle of the axis for receiving in has an at least rotating tool, in the cylinder barrel exclusively in Axial area of the axial longitudinal inherent amplitude vibration nodes circumferentially equidistantly arranged, longitudinally oriented to the axis of symmetry, elongated Material recesses.
  • the core drill bit Due to the material recesses elongated along the axis of symmetry on the Longitudinal inherent vibration nodes are the ones in between Cylinder shells are no longer circumferentially coupled to one another by vibration, which suppresses the excitation of parasitic, energy-consuming, radial modes becomes.
  • the core drill bit Through the circumferentially with each other in the area of the longitudinal natural vibration bellies vibration-coupled cylinder shells, the core drill bit has a slim Longitudinal transducer corresponding to natural frequency, which differs from that of one Cylinder tube differs. The additional energy leads to axial Longitudinal vibrations with significantly increased amplitude, which is therefore sufficient vibrationally robust are excited.
  • the elongated material recesses are advantageously oriented axially parallel, as a result of which none parasitic shear modes are excited.
  • the elongated material recesses are advantageously designed as longitudinal slots, which completely suppresses the radial modes.
  • the core drill bit advantageously has a cross-sectional jump and elongated Material recesses on, which results in a further increase in the amplitude by the Superposition of both individual effects results.
  • a core drill bit 1 has a large diameter a thin-walled cylinder tube 3 with abrasive bodies 2 and one Opposite front-connected, thin-walled lid 4, which in the Symmetry and axis of rotation A an insertion end 5 for positive inclusion in a shown rotating tool.
  • the insertion end 5 is an axial Ultrasonic vibration stimulating, part of a schematically indicated electro-acoustic Actuator 6 in the form of an inductively supplied with voltage via a rotary transformer Piezo converter arranged.
  • the cover 4 has one at the radial point Amplitude vibration node circuit 7 of a bending natural vibration 8 with a Amplitude maximum at the axis of symmetry A and at the base of the cylinder tube 3 one concentric cross-sectional jump 9, with an increase in amplitude at the approach formed.
  • the axial area x is exclusively in the axial area
  • Longitudinal inherent amplitude vibration node 10 with an elongation maximum both end faces circumferentially equidistant, axially parallel to the axis of symmetry A oriented, elongated material recesses 11 in the form of longitudinal slots, which are positioned at 1/4 and / or 3/4 of the relative length.
  • Cover projection 12 radially by a quarter of the wavelength of the natural bending vibration 8 the cylinder tube 3 over.

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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)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Catalysts (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 relates to a drive that rotates about the axis of symmetry Core drill bit with cutting or grinding tools for the abrasive removal of mineral Substrates such as rock, which has an axial ultrasound 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.Pot-shaped core drill bits usually consist of an end face Grinding bodies occupied cylinder tube and an opposite end face connected Cover, which has an insertion end in the middle of the axis for at least one has rotating tool device. With a usual superposition with ultrasound in the Range from 20 kHz to 200 kHz at a natural frequency of the core bit, this is from an actuator in the insertion end centrally excited in the center of the axis. Such core bits can only be realized up to small diameters of the cylinder tube of about 100 mm, because when engaging in the subsoil, due to the larger with larger diameters Relationship to the excitation diameter of the actuator, no robust vibration, i.e. also with high damping via an axial force required for abrasive degradation on the Cylinder tube in which 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.According to DE3812917 has a natural frequency, not specified in more detail operated, slot drill longitudinal openings in a drill bit. Also points According to DE3635806, an ultrasonic vibrator that can be controlled with respect to the vibration pattern several equidistant longitudinal slots in a cylindrical base body, whereby the Remaining webs act as pure longitudinal oscillators.

Nach der DE4444853 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.According to DE4444853, a core drill bit has a cylinder tube and an end face connected lid, which is axial in the center of the axis with a natural frequency Bending vibrations is excited. In addition, one stimulates bending vibrations Grinding wheel with radial grinding wheels of different thickness a concentric Cross-sectional jump at a geometrically undefined location.

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, according to DE19758243, an ultrasonic transducer to increase the directivity of a flat radiated sound field on a bending vibrating plate, which is concentric Has cross-sectional jumps arranged on amplitude oscillation node circles are.

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 to implement a larger core drill bit Diameter with a robust vibration with central, axial ultrasonic excitation Excitation behavior for axial longitudinal vibrations in the cylinder barrel. Another Aspect consists in increasing the axial vibration amplitude at the axial end of the Cylinder tube.

Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The task is essentially solved by the features of the independent claims. Advantageous further developments result 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, dadurch gekennzeichnet, dass das Zylinderrohr bezüglich der Sollanregungsfrequenz zur Ausbildung einer ganzzahligen Anzahl von Amplitudenschwinungsbäuchen der axialen Longitudinalschwingungen dimensioniert ist.Essentially, a core bit for the abrasive removal of mineral Surfaces with a cylinder tube with cutting or grinding bodies on the front and an oppositely connected front cover, which in the middle of the axis Has insertion end for receiving in an at least rotating tool, one with respect to a target excitation frequency to form an integer number of Amplitude antinodes of the concentric bending vibration dimensioned Cover on, characterized in that the cylinder tube with respect to the Target excitation frequency for forming an integer number of Amplitude antinodes of the axial longitudinal vibrations is dimensioned.

Durch die Kombination der resonant bestimmten Einzelkomponenten in Form von Deckel und Zylinderrohr ergibt sich ein bei axialer Ultraschallanregung schwingungsrobustes Anregungsverhalten der Kernbohrkrone.By combining the resonantly determined individual components in the form of a lid and cylinder tube results in a robust vibration with axial ultrasonic excitation Excitation behavior of the core bit.

Vorteilhaft weist der Deckel in der Nähe der Position eines Amplitudenschwingungsknotenkreises einer Biegeeigenschwingung einen konzentrischen Querschnittssprung auf.The lid advantageously has a position close to one Amplitude vibration node circle of a bending natural vibration a concentric Cross-sectional jump on.

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 cross-sectional jump at the location of an amplitude vibration node circle in the cover is used for the amplitude transformation of the bending vibration with a significant increase the amplitude of the antinode occurring at the base of the cylinder tube, which in the cylinder barrel has axial longitudinal vibrations with a significantly increased amplitude stimulates, which are thus sufficiently vibrationally robust. The geometric location this amplitude vibration node circle is close to the position of the Amplitude vibration node of the concentrically standing radial waves, it being at a radial cross-sectional jump to a slight shift in the location of the Amplitude vibration node is coming.

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 the case of practically relevant core drill bits, this is preferably dimensioned to a total of two or three amplitude vibration nodes with respect to the target 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 from 0.2 to 0.4 determines a relative radius range for the position of the cross-sectional jump at the node assigned from the inside according to the table below, the optimum being in parentheses: Total amplitude node No. of the node at the cross-sectional jump relative radius of the cross-sectional jump Thickness ratio at the cross-sectional 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)

In einer weiteren, jedoch nicht notwendig alternativen, Variante weist eine Kernbohrkrone mit 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, im Zylinderrohr ausschliesslich im Axialbereich der axialen Longitudinaleigenamplitudenschwingungsknoten umfänglich äquidistant angeordnete, längs zur Symmetrieachse orientierte, längliche Materialausnehmungen auf.In a further, but not necessarily alternative, variant, a core drill bit has a cylinder tube with grinding wheels on the front and one opposite frontally connected cover, which has an insertion end in the middle of the axis for receiving in has an at least rotating tool, in the cylinder barrel exclusively in Axial area of the axial longitudinal inherent amplitude vibration nodes circumferentially equidistantly arranged, longitudinally oriented to the axis of symmetry, elongated Material recesses.

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 material recesses elongated along the axis of symmetry on the Longitudinal inherent vibration nodes are the ones in between Cylinder shells are no longer circumferentially coupled to one another by vibration, which suppresses the excitation of parasitic, energy-consuming, radial modes becomes. Through the circumferentially with each other in the area of the longitudinal natural vibration bellies vibration-coupled cylinder shells, the core drill bit has a slim Longitudinal transducer corresponding to natural frequency, which differs from that of one Cylinder tube differs. The additional energy leads to axial Longitudinal vibrations with significantly increased amplitude, which is therefore sufficient vibrationally robust are excited. To determine the axial range of the Material recesses required wavelength λ of the longitudinal natural vibration at a Frequency f is determined with λ = c / f with the longitudinal wave velocity c over c = square root (E / p) from the modulus of elasticity E and the density p. Advantageous For a cylinder tube designed as a λ oscillator, there is an average axial position of the Material recesses of 1/4 and / or 3/4 of its relative length.

Vorteilhaft sind die länglichen Materialausnehmungen achsparallel orientiert, wodurch keine parasitären Schermoden angeregt werden.The elongated material recesses are advantageously oriented axially parallel, as a result of which none parasitic shear modes are excited.

Vorteilhaft sind die länglichen Materialausnehmungen als Längsschlitze ausgebildet, wodurch die Radialmoden vollständig unterdrückt werden.The elongated material recesses are advantageously designed as longitudinal slots, which completely suppresses the radial modes.

Vorteilhaft weist die Kernbohrkrone einen Querschnittssprung und längliche Materialausnehmungen auf, wodurch sich eine weitere Erhöhung der Amplitude durch die Überlagerung beider Einzeleffekte ergibt.The core drill bit advantageously has a cross-sectional jump and elongated Material recesses on, which results in a further increase in the amplitude by the Superposition of both individual effects results.

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 cover that usually ends directly on the attached cylinder tube, an advantageous variant of a cover projection that does not belong to the cover radially over the cylinder tube, further advantageously by a quarter of the wavelength of the Bending natural vibration, whereby the proportion of the radial modes excited in the cylinder tube can be further suppressed.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit der Darstellung einer Kernbohrkrone.The invention is explained in more detail with respect to an advantageous embodiment 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.According to the representation in partial section, a core drill bit 1 has a large diameter a thin-walled cylinder tube 3 with abrasive bodies 2 and one Opposite front-connected, thin-walled lid 4, which in the Symmetry and axis of rotation A an insertion end 5 for positive inclusion in a shown rotating tool. In the insertion end 5 is an axial Ultrasonic vibration stimulating, part of a schematically indicated electro-acoustic Actuator 6 in the form of an inductively supplied with voltage via a rotary transformer Piezo converter arranged. The cover 4 has one at the radial point Amplitude vibration node circuit 7 of a bending natural vibration 8 with a Amplitude maximum at the axis of symmetry A and at the base of the cylinder tube 3 one concentric cross-sectional jump 9, with an increase in amplitude at the approach formed. In the cylinder tube 3, the axial area x is exclusively in the axial area Longitudinal inherent amplitude vibration node 10 with an elongation maximum both end faces circumferentially equidistant, axially parallel to the axis of symmetry A oriented, elongated material recesses 11 in the form of longitudinal slots, which are positioned at 1/4 and / or 3/4 of the relative length. On the lid 4 is Cover projection 12 radially by a quarter of the wavelength of the natural bending vibration 8 the cylinder tube 3 over.

Claims (7)

Kernbohrkrone zum abrasiven Abtragen von mineralischen Untergründen mit einem stirnseitig mit Schneid- oder Schleifkörpern (2) besetzten Zylinderrohr (3) und einem gegenüberliegend stirnseitig verbundenen Deckel (4), welcher in der Achsmitte ein Einsteckende (5) zur Aufnahme in ein zumindest drehendes Werkzeuggerät aufweist sowie bezüglich einer Sollanregungsfrequenz zur Ausbildung einer ganzzahligen Anzahl von Amplitudenschwinungsbäuchen der konzentrischen Biegeschwingung dimensioniert ist, dadurch gekennzeichnet, dass das Zylinderrohr (3) bezüglich der Sollanregungsfrequenz zur Ausbildung einer ganzzahligen Anzahl von Amplitudenschwinungsbäuchen der axialen Longitudinalschwingungen dimensioniert ist.Core drill bit for the abrasive removal of mineral substrates with a cylinder tube (3) on the end face with cutting or grinding bodies (2) and a cover (4) connected on the opposite side, which has an insertion end (5) in the center of the axis for reception in an at least rotating tool device and dimensioned with respect to a target excitation frequency to form an integer number of amplitude vibration antinodes of the concentric bending vibration, characterized in that the cylinder tube (3) is dimensioned with respect to the target excitation frequency to form an integer number of amplitude vibration antinodes of the axial longitudinal vibrations. Kernbohrkrone nach Anspruch 1, dadurch gekennzeichnet, dass im Deckel (4) nahe der Stelle eines Amplitudenschwingungsknotenkreises (7) einer Biegeeigenschwingung (8) ein konzentrischer Querschnittssprung (9) vorhanden ist.Core drill bit according to claim 1, characterized in that a concentric cross-sectional jump (9) is present in the cover (4) near the location of an amplitude oscillation node circle (7) of a natural bending oscillation (8). Kernbohrkrone nach Anspruch 1, dadurch gekennzeichnet, dass im Zylinderrohr (3) ausschliesslich im Axialbereich (x) der axialen Longitudinaleigenamplitudenschwingungsknoten (10) umfänglich äquidistant angeordnete, längs zur Symmetrieachse (A) orientierte, längliche Materialausnehmungen (11) vorhanden sind.Core drill bit according to Claim 1, characterized in that elongate material recesses (11) are provided in the cylinder tube (3) exclusively equidistantly in the axial region (x) of the axial longitudinal inherent amplitude oscillation nodes (10) and are arranged longitudinally to the axis of symmetry (A). Kernbohrkrone nach Anspruch 3, dadurch gekennzeichnet, dass die länglichen Materialausnehmungen (11) achsparallel orientiert sind.Core drill bit according to claim 3, characterized in that the elongate material recesses (11) are oriented axially parallel. Kernbohrkrone nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die länglichen Materialausnehmungen (11) als Längsschlitze ausgebildet sind.Core drill bit according to claim 3 or 4, characterized in that the elongate material recesses (11) are designed as longitudinal slots. Kernbohrkrone nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass sowohl der Querschnittssprung (9) als auch längliche Materialausnehmungen (11) vorhanden sind, welche optional bei 1/4 und/oder 3/4 der relativen Länge des Zylinderrohrs (3) positioniert sind.Core drill bit according to one of the preceding claims, characterized in that both the cross-sectional jump (9) and elongated material recesses (11) are present, which are optionally positioned at 1/4 and / or 3/4 of the relative length of the cylinder tube (3). Kernbohrkrone nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass am Deckel (4) ein radial über das Zylinderrohr (3) überstehender Deckelüberstand (12) vorhanden ist, welcher optional um ein Viertel der Wellenlänge der Biegeeigenschwingung (8) übersteht.Core drill bit according to one of the preceding claims, characterized in that on the cover (4) there is a cover projection (12) which projects radially beyond the cylinder tube (3) and which optionally protrudes by a quarter of the wavelength of the natural bending vibration (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
DE10162636A DE10162636A1 (en) 2001-12-20 2001-12-20 Ultraschallkernbohrkrone
DE10162636 2001-12-20

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

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EP (1) EP1323496B1 (en)
JP (1) JP4319400B2 (en)
AT (1) ATE385876T1 (en)
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Also Published As

Publication number Publication date
JP4319400B2 (en) 2009-08-26
DE50211664D1 (en) 2008-03-27
ATE385876T1 (en) 2008-03-15
US20030146024A1 (en) 2003-08-07
JP2003200415A (en) 2003-07-15
EP1323496B1 (en) 2008-02-13
US6948574B2 (en) 2005-09-27
DE10162636A1 (en) 2003-07-03

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