EP2611571B1 - Machine tool, in particular hand-held machine tool - Google Patents

Machine tool, in particular hand-held machine tool Download PDF

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Publication number
EP2611571B1
EP2611571B1 EP11749172.0A EP11749172A EP2611571B1 EP 2611571 B1 EP2611571 B1 EP 2611571B1 EP 11749172 A EP11749172 A EP 11749172A EP 2611571 B1 EP2611571 B1 EP 2611571B1
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EP
European Patent Office
Prior art keywords
working
power tool
belt
impinges
excitation actuator
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EP11749172.0A
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German (de)
French (fr)
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EP2611571A1 (en
Inventor
Peter Keller-Sornig
Georg Hejtmann
Aldo Di Nicolantonio
Stefano Delfini
Ralf Materna
Adrian Schoch
Dieter Troendle
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories
    • B24B21/22—Accessories for producing a reciprocation of the grinding belt normal to its direction of movement
    • 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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/06—Portable grinding machines, e.g. hand-guided; Accessories therefor with abrasive belts, e.g. with endless travelling belts; Accessories therefor

Definitions

  • a vibration excitation on a magnetic or inductive basis can take place via excitation actuators provided for this purpose.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Description

Die Erfindung betrifft eine Werkzeugmaschine, insbesondere eine Handwerkzeugmaschine, gemäß dem Oberbegriff des Anspruches 1.The invention relates to a machine tool, in particular a hand tool, according to the preamble of claim 1.

Stand der TechnikState of the art

Als Handwerkzeugmaschine gestaltete Schleifmaschinen der vorgenannten Art sind beispielsweise aus der DE 101 25 483 A1 bekannt. Bei diesen Maschinen ist als Traganordnung für das Arbeitsmittel eine Tragplatte vorgesehen, über die eine Arbeitslage für das Arbeitsmittel vorgegeben ist und das Arbeitsmittel bei zur zu bearbeitenden Oberfläche eines Werkstückes paralleler Arbeitsebene angetrieben beweglich ist. Auf die Tragplatte wirkt ein Aktor derart, dass die Tragplatte Horizontal-Bewegungen und normal dazu Vertikal-Bewegungen aufweist. Durch die Überlagerung der Horizontal-Bewegung mit einer Vertikal-Bewegung wird die Effizienz des Schleifvorganges wesentlich erhöht.As a hand tool designed grinders of the aforementioned type are for example from the DE 101 25 483 A1 known. In these machines, a support plate is provided as a supporting arrangement for the working means, via which a working position for the working means is predetermined and the working means is driven to be machined to the surface of a workpiece parallel working plane. On the support plate, an actuator acts such that the support plate has horizontal movements and normal to vertical movements. The superposition of the horizontal movement with a vertical movement, the efficiency of the grinding process is significantly increased.

Auch aus der DE 10 2004 061 222 B3 ist eine Maschine der vorgenannten Art bekannt. Hierbei wird das Arbeitsmittel hochfrequent über einen Anregungsaktor beaufschlagt, der auf Ultraschallbasis arbeitet und auf das Arbeitsmittel über eine zwischen diesem und der Tragplatte liegende Gelmasse wirkt. Die Schwingungsanregung über den Anregungsaktor erfolgt vertikal oder horizontal zur Arbeitsebene mit dem Ziel einer Verfeinerung der Oberfläche, wobei als derartig ausgebildete Werkzeugmaschinen Schleifmaschinen mit oszillierendem oder rotierendem Antrieb der Traganordnung wie auch Bandschleifer vorgesehen sind.Also from the DE 10 2004 061 222 B3 is a machine of the aforementioned type known. In this case, the working medium is subjected to high frequency via an excitation actuator which operates on an ultrasound basis and acts on the working medium via a gel mass lying between it and the support plate. The vibration excitation via the excitation actuator takes place vertically or horizontally to the working plane with the aim of refining the surface, being provided as such machine tools grinding machines with oscillating or rotating drive the support assembly as well as belt grinder.

Bei Schleifvorrichtungen mit einem umlaufenden Schleifmittel, insbesondere einem Schleifband, und einem zur Fixierung des jeweils zu bearbeitenden Werkstücks vorgesehenen Werkstückträger in Form eines umlaufenden Transportbandes ist es aus der DE 100 41 925 A1 bekannt, das Schleifband in dessen dem Transportband zugewandten, parallel zum Transportband verlaufenden und gegen das vom Transportband getragene, zwischen Transport und Schleifband liegende Werkstück abgestützten Bereich über ein Andrückelement in Richtung auf das Werkstück und das darunter liegende Transportband zu belasten. Überlagert zur gleichgerichteten Bewegung von Transportband und Schleifband werden diese relativ zueinander in eine von der Vorschubrichtung abweichende Schwingbewegung versetzt. Die bezüglich eines jeweiligen Oberflächenpunktes des Werkstücks aus verschiedenen, durch die Vorschub- und Schwingbewegungen bestimmten Richtungen angreifenden Kräfte ermöglichen eine hohe Abtragrate und sollen diese auch insbesondere durch Reduzierung der temperaturabhängig im Bearbeitungsbereich auftretenden adhäsiven Verschleißmechanismen gewährleisten.In grinding devices with a revolving abrasive, in particular a grinding belt, and a provided for fixing the respective workpiece to be machined workpiece carrier in the form of a circulating conveyor belt, it is from the DE 100 41 925 A1 known to burden the abrasive belt in the transport belt facing, parallel to the conveyor belt and supported against the conveyor belt supported, lying between transport and sanding workpiece supported area via a pressure element in the direction of the workpiece and the underlying conveyor belt. overlapped for the rectified movement of the conveyor belt and grinding belt they are offset relative to each other in a deviating from the feed direction swinging motion. The forces acting with respect to a respective surface point of the workpiece from different directions determined by the advancing and oscillating movements enable a high removal rate and are also intended to ensure this in particular by reducing the adhesive wear mechanisms occurring in the processing region as a function of temperature.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zugrunde, mithilfe der hochfrequent erfolgenden Beaufschlagung des Arbeitsmittels dessen mit guten Arbeitsergebnissen nutzbare Standzeit zu verlängern.The invention has for its object to extend by means of the high-frequency impingement of the working fluid whose usable with good work results life.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst, die Unteransprüche geben zweckmäßige Weiterbildungen an.This object is achieved with the features of claim 1, the dependent claims indicate appropriate developments.

Bei der erfindungsgemäßen Lösung wird nicht direkt die Art des Einwirkens des Arbeitsmittels auf die jeweils zu bearbeitende Werkstückfläche aufgrund der schwingenden, insbesondere hochfrequenten Anregung des Arbeitsmittels beeinflusst, vielmehr wird das Arbeitsmittel außerhalb des Kontaktbereiches zwischen Arbeitsmittel und Werkstück, in einem zur Arbeitsebene abgesetzten Bereich entsprechend angeregt, insbesondere hochfrequent beaufschlagt. Dies derart, dass die Arbeitsstruktur des Arbeitsmittels von etwaigen Anlagerungen oder Anhaftungen befreit wird, also beispielsweise nicht durch anhaftende Ablagerungen und/oder Verunreinigungen beeinträchtigt wird.In the solution according to the invention, the type of action of the working medium on the workpiece surface to be machined is not directly influenced due to the oscillating, in particular high-frequency excitation of the working medium, but rather the working medium outside the contact area between working medium and workpiece is correspondingly excited in a region offset from the working plane , in particular high-frequency acted upon. This is such that the working structure of the working fluid is freed of any deposits or adhesions, so for example not affected by adhering deposits and / or impurities.

Erfindungsgemäß ist es vorgesehen, das als umlaufendes Schleif- oder Polierband ausgebildete Arbeitsmittel in einem von seinem längs der Arbeitsebene sich erstreckenden Trum abgesetzten Bereich zu beaufschlagen, wobei der zwischen den Umlenkungen sich frei erstreckende Bereich des rücklaufenden Trums einen Ansatzbereich für einen oder mehrere Anregungsaktoren bildet, die auf das Band direkt oder indirekt, gegebenenfalls jeweils über eine oder mehrere Schlagleisten als Übertragungsglieder, zugreifen.According to the invention, the working means embodied as a revolving grinding or polishing belt are loaded in a region offset from its longitudinally extending working surface, the region of the returning strand extending freely between the deflections forming a region of application for one or more excitation actuators, which access the band directly or indirectly, optionally via one or more blow bars as transmission elements.

So kann bei dem durch ein Polierband oder Schleifband gebildeten Arbeitsmittel angelagerter Schmutz oder Staub außerhalb des Arbeitsbereiches abgeschüttelt und gegebenenfalls auch unmittelbar abgesaugt werden, so dass das Arbeitsmittel in seinem jeweiligen Arbeitsbereich gereinigt zum Einsatz kommt. In entsprechender Weise können bei dem als Schleifband ausgebildeten Arbeitsmittel durch die hochfrequente Beaufschlagung die Schleifstruktur beeinträchtigende und gegebenenfalls auch, durch Verschmieren oder dergleichen, teilweise abdeckende Anlagerungen abgesprengt werden, so dass sich zwar ein normaler standzeitbedingter Verschleiß der Arbeitsstruktur ergibt, die Struktur in ihrem jeweiligen Erhaltungszustand aber voll nutzbar bleibt, also nicht durch Ablagerungen, Verschmieren oder dergleichen überdeckt und nicht mehr nutzbar ist.Thus, deposited dirt or dust outside of the work area can be shaken off in the working medium formed by a polishing belt or sanding belt and, if appropriate, also be sucked off immediately, so that the working fluid is used cleaned in its respective working area. In a corresponding manner, in the trained as a grinding belt working fluid by the high-frequency impingement affecting the abrasive structure and possibly also, by smearing or The like, partially covering deposits are blasted off, so that although there is a normal lifetime wear of the working structure, the structure in their respective state of preservation but fully usable, so not covered by deposits, smearing or the like and is no longer usable.

Insbesondere erfolgt die schwingende Beaufschlagung des Arbeitsmittels über den jeweiligen Anregungsaktor bevorzugt auf der von der Arbeitsseite abgelegenen Rückseite des Arbeitsmittels, und zwar wiederum bevorzugt orthogonal zur Erstreckungsrichtung des Arbeitsmittels.In particular, the oscillatory loading of the working medium via the respective excitation actuator preferably takes place on the rear side of the working medium remote from the working side, and in turn preferably orthogonally to the direction of extent of the working medium.

Ist zumindest ein Anregungsaktor als Anregungselement für mehrere Schlagleisten vorgesehen, die sich wie Einzelleisten bevorzugt quer zur Umlaufrichtung des Arbeitsmittels erstrecken, so kann es zweckmäßig sein, diese in Umlaufrichtung beabstandet, und gegebenenfalls auch winklig zueinander angestellt, vorzusehen, um wellenförmige Anregungsmuster zu erreichen, die eine absprengende Reinigung von den jeweiligen Anlagerungen begünstigen.If at least one excitation actuator is provided as an excitation element for a plurality of blow bars, which extend like individual strips preferably transversely to the direction of rotation of the working means, it may be appropriate to spaced them in the circumferential direction, and possibly also angled employed to provide wavy excitation pattern, the favor a detonating cleaning of the respective deposits.

Im Rahmen der Erfindung kommen insbesondere Piezoelemente als Anregungsaktoren in Frage, ein Anregung kann erfindungsgemäß aber auch auf magnetoresistiver Basis erfolgen, wobei Betriebsfrequenzen im Bereich von 15 kHz bis 1 MHz, typischerweise aber von 20 kHz bis 60 KHz zum Einsatz kommen, und dies bei einer Leistung eines Anregungsaktors, die für diesen Anwendungszweck bevorzugt in der Größenordnung von 20 W oder darüber liegt.In the context of the invention, in particular piezoelectric elements as excitation actuators in question, according to the invention but also be carried out on a magnetoresistive basis, operating frequencies in the range of 15 kHz to 1 MHz, but typically from 20 kHz to 60 kHz are used, and this at a Power of an excitation actuator, which is preferably of the order of 20 W or more for this purpose.

Die Leistungsdichte für den erfindungsgemäßen Zweck vorgesehener Ultraschallaktoren liegt bei 5 oder mehr W/cm3 Piezovolumen, typischerweise bei mehr als 20W/cm3 Piezovolumen, wobei ein aktives Piezovolumen von >0,2cm3, bevorzugt >1cm3 vorgesehen ist. Zweckmäßigerweise ist ferner eine Phasenregelkette zur genauen Anregung in der Resonanzfrequenz für höchste Leistungsausbeute vorgesehen, wobei die Anregung nach Möglichkeit mit der Phasenverschiebung 0° von Strom und Spannung erfolgt.The power density for the purpose of the present invention intended ultrasonic actuators is 5 or more W / cm3 piezo volume, typically more than 20W / cm3 piezo volume, with an active piezoelectric volume of> 0.2cm3, preferably> 1cm3 is provided. Conveniently, a phase-locked loop for accurate excitation in the resonant frequency for maximum power output is also provided, the excitation is possible with the phase shift 0 ° of current and voltage as far as possible.

Aufgebaut auf dieser Basis lässt sich ein gut handhabbares Schleif- oder Polierwerkzeug gestalten, wobei bevorzugt nicht nur der Anregungsaktor insbesondere in Form eines Ultraschallerzeugers, sondern auch die Ansteuerelektronik und die Energieversorgung in das Maschinengehäuse integriert angeordnet werden und anstelle oder zusätzlich zu einer möglichen Netzversorgung auch eine Energieversorgung über ein Batteriepack, insbesondere ein ansteckbares Batteriepack erfolgen kann.Built on this basis, an easily handled grinding or polishing tool can be designed, wherein preferably not only the excitation actuator, in particular in the form of an ultrasound generator, but also the control electronics and the power supply are integrated into the machine housing and instead of or in addition to a possible power supply also a Power supply via a battery pack, in particular an attachable battery pack can be done.

Im Rahmen der Erfindung liegt es auch, das Arbeitsmittel in Form eines Schleif- oder Polierbandes auf magnetischer oder induktiver Basis schwingend anzuregen. Insbesondere in Verbindung mit solchen Formen der schwingenden Anregung und/oder Beaufschlagung des des Schleif- oder Polierbandes, erweist es sich als zweckmäßig, dieses mit metallischen Einlagerungen, Einlagen, insbesondere in Faden- oder Gewebeform, oder auch auf einem metallischen Träger aufbauendes Schleif- oder Polierband auszubilden.It is also within the scope of the invention to vibrate the working medium in the form of a grinding or polishing belt on a magnetic or inductive basis. In particular, in conjunction with such forms of oscillatory excitation and / or admission of the grinding or polishing belt, it proves to be useful, this with metallic deposits, deposits, especially in thread or fabric form, or on a metallic support building up grinding or To train polishing tape.

Weitere Einzelheiten und Merkmale der Erfindung ergeben sich aus den Ansprüchen, der Figurenbeschreibung und der Zeichnung, die weitgehend schematisiert, eine als Bandschleifer ausgebildete Handwerkzeugmaschine in perspektivischer, schematisierter Darstellung schräg von hinten unten mit darunter liegendem Werkstück zeigt.Further details and features of the invention will become apparent from the claims, the description of the figures and the drawing, which is largely schematic, designed as a belt sander hand tool in a perspective, schematic representation obliquely from behind down with underlying workpiece.

In der Figur ist als Beispiel einer erfindungsgemäßen Elektro-Werkzeugmaschine eine Handwerkzeugmaschine 1 in Form eines handgeführten Bandschleifers 2 gezeigt, der als Arbeitsmittel 3 ein umlaufendes Schleifband 4 aufweist, welches über eine Traganordnung 5 mit Umlenkrollen 6 und 7 zum Maschinengehäuse 8 abgestützt ist. Das Maschinengehäuse 8 nimmt den Antrieb für das Schleifband 4 auf, wobei ein entsprechender Antriebsmotor 9 schematisch angedeutet ist, der mit zumindest einer der Umlenkrollen 6, 7 antriebsverbunden ist, über die das Schleifband 4 geführt ist. Die Umlenkrollen 6, 7 sind parallelachsig zueinander angeordnet und zwischen den Auflagebereichen des Schleifbandes 4 zu den Umlenkrollen 6, 7 erstreckt sich dies mit seinen frei liegenden Trummen 10, 11. Dabei wird unter einem Trum insbesondere ein freier, nicht aufliegender Abschnitt des Schleifbandes 4 verstanden.In the figure, as an example of an electric machine tool according to the invention, a hand tool 1 in the form of a hand-held belt grinder 2 is shown, which has as a working means 3 a revolving belt 4, which is supported via a support assembly 5 with pulleys 6 and 7 to the machine housing 8. The machine housing 8 receives the drive for the grinding belt 4, wherein a corresponding drive motor 9 is indicated schematically, with at least one of the deflection rollers 6, 7 is drivingly connected, over which the grinding belt 4 is guided. The deflection rollers 6, 7 are arranged parallel axis to each other and between the support areas of the sanding belt 4 to the deflection rollers 6, 7, this extends with its exposed Trummmen 10, 11. Here is under a strand in particular a free, non-lying portion of the sanding belt 4 understood ,

Von diesen Trummen 10, 11 erstreckt sich das in der Darstellung untere, der zu bearbeitenden Oberfläche 12 eines im Beispiel schematisiert dargestellten Werkstückes 13 zugewandte Trum 11 in der jeweiligen Arbeitsebene 100, in der es auf der zu bearbeitenden Oberfläche 12 aufliegt und sich - insbesondere reibend, schneidend, kratzend, schleifend, polierend - in Abhängigkeit von der Art des Arbeitsmittels 3 abtragend und/oder glättend über diese bewegt. Verbunden damit ist seitens der Oberfläche 12 des Werkstücks 13 ein mehr oder minder starker Abrieb, sowie eine gewisse Abstumpfung des Arbeitsmittels. Dies einmal in Abhängigkeit vom Material der zu bearbeitenden Werkstückoberfläche 12, zum anderen von der Art der Beschichtung des Arbeitsmittels 3, zum Beispiel mit Schleifpartikeln, und nicht zuletzt auch in Abhängigkeit von der Länge des Trums 11, der Umlaufgeschwindigkeit und der Anpresskraft zwischen Arbeitsmittel 3 und zu bearbeitender Oberfläche 12. Insbesondere diese Faktoren sind auch maßgebend dafür, ob und inwieweit ein jeweiliger Abrieb über das umlaufende Arbeitsmittel 3 aus der jeweiligen, in der Arbeitsebene 100 sich erstreckenden Arbeitszone vom umlaufenden Arbeitsmittel ausgetragen wird oder, insbesondere materialabhängig und temperaturabhängig, sich mit dem Arbeitsmittel verbindet und gegebenenfalls dessen Arbeitsstruktur unbrauchbar macht, sei es durch Abstumpfen, Verkleben oder Anbacken.Of these Trummen 10, 11 extends in the representation lower, the surface to be machined 12 of a schematically illustrated in the example workpiece 13 strand 11 in the respective working level 100 in which it rests on the surface to be machined 12 and - in particular rubbing , cutting, scratching, grinding, polishing - depending on the type of working medium 3 erosive and / or smoothing over these moves. Associated with this is on the part of the surface 12 of the workpiece 13 a more or less strong abrasion, and a certain dulling of the working fluid. This once depending on the material of the workpiece surface to be machined 12, on the other hand on the type of coating of the working medium 3, for example with abrasive particles, and not least depending on the length of the strand 11, the rotational speed and the contact force between the working means 3 and To be processed surface 12. In particular, these factors are also decisive for whether and to what extent a respective abrasion on the rotating working means 3 from the respective, extending in the working plane 100 working zone is discharged from the rotating work equipment or, in particular material dependent and temperature-dependent, with the Connecting working equipment and possibly makes its working structure useless, be it by blunting, gluing or baking.

Um die letztgenannten Beeinträchtigungen, insbesondere ein Zuschmieren, Verkleben und/oder Anbacken auszuschließen, wird erfindungsgemäß das Arbeitsmittel in einem zur Arbeitsebene 100, und damit zur Oberfläche 12 des Werkstückes 13 abgesetzten Bereich über einen Anregungsaktor 15, insbesondere einen Ultraschallschwinger hochfrequent beaufschlagt, wobei als Beaufschlagungsbereich das bevorzugt sich im Wesentlichen frei zwischen den Umlenkrollen 6, 7 erstreckende, von der Arbeitsebene 100 abgesetzte obere Trum 10 in Frage kommt.In order to exclude the last-mentioned impairments, in particular smearing, sticking and / or baking, the working medium is acted upon in a high frequency by the excitation actuator 15, in particular an ultrasonic oscillator, in a region remote from the working surface 100, and thus to the surface 12 of the workpiece 13 which is preferably substantially free between the deflection rollers 6, 7 extending, stepped from the working level 100 upper run 10 comes into question.

Die erfindungsgemäß vorgesehene Schwingungsbeaufschlagung erfolgt rückseitig am oberen Trum 10 bevorzugt über zumindest ein leistenartiges, sich quer zur Längsrichtung des Trums erstreckendes Übertragungsglied 14, das direkt oder indirekt von dem Anregungsaktor 15 beaufschlagt ist. Dieser kann, wie das Übertragungsglied 14, im Freiraum zwischen oberem und unterem Trum 10, 11 angeordnet sein, oder auch, bei seitlicher Anordnung zum Maschinengehäuse 8, mit dem Übertragungsglied 14 verbunden sein. Im Rahmen der Erfindung liegt es ferner, dass der Anregungsaktor 15 selbst auf das Arbeitsmittel 3 wirkt und beispielsweise in leistenartiger Ausgestaltung, entsprechend dem Übertragungsglied 14, rückseitig am oberen Trum 10 angreift. Eine besonders effiziente, klopfende Beaufschlagung des Arbeitsmittels 3 ergibt sich, wenn das Übertragungsglied 14, gegebenenfalls auch der unmittelbar auf das Arbeitsmittel 3 einwirkende Anregungsaktor 15, zum Arbeitsmittel 3 so angeordnet ist, dass sich lediglich bei Erregung des Anregungsaktors 15 eine berührende Beaufschlagung des Arbeitsmittels 3 ergibt, ansonsten aber das Arbeitsmittel 3 frei zum Übertragungsglied 14 bzw. zum Anregungsaktor 15 liegt.The oscillation loading provided according to the invention takes place on the rear side at the upper run 10, preferably via at least one strip-like transfer element 14 extending transversely to the longitudinal direction of the run, which is acted upon directly or indirectly by the excitation actuator 15. This can, like the transmission member 14, be arranged in the free space between the upper and lower run 10, 11, or, in the case of a lateral arrangement to the machine housing 8, be connected to the transmission member 14. In the context of the invention, it is also the case that the excitation actuator 15 itself acts on the working means 3 and engages, for example, in a strip-like configuration, corresponding to the transmission member 14, on the rear side at the upper run 10. A particularly efficient, knocking action on the working means 3 results when the transmission member 14, possibly also acting directly on the working means 3 excitation actuator 15, the working means 3 is arranged so that only upon excitation of the excitation actuator 15, a touching loading of the working medium. 3 results, but otherwise the working means 3 is free to the transmission member 14 and the Anreungsaktor 15.

In entsprechender Weise kann im Rahmen der Erfindung eine Schwingungsanregung auf magnetischer oder induktiver Basis über hierfür vorgesehene Anregungsaktoren erfolgen.In a corresponding manner, in the context of the invention, a vibration excitation on a magnetic or inductive basis can take place via excitation actuators provided for this purpose.

Die erfindungsgemäße, weitgehend vom Maschinengehäuse 8 umschlossene Unterbringung der Traganordnung 5 und des Arbeitsmittels 3 macht es in vorteilhafter Weise möglich, vom Arbeitsmittel 3 über den Anregungsaktor 15, unmittelbar oder indirekt unter Zwischenschaltung des Übertragungsgliedes 14, abgelöste, insbesondere abgesprengte Verunreinigungen insbesondere direkt über eine dem Maschinengehäuse 8 zugeordnete oder vom Maschinengehäuse 8 aufgenommene Absaugeinrichtung zu erfassen, die in üblicher Weise aufgebaut und ausgebildet sein kann, wobei auch ein entsprechender Sammelbehälter zum Maschinengehäuse 8 entnehmbar oder abtrennbar vorgesehen sein kann. Angedeutet ist in der Figur eine solche Absaugeinrichtung schematisiert bei 16 in Form eines Gebläses, das bevorzugt über den Antriebsmotor 9 der Traganordnung 5 mitbetrieben wird und über das eine längs des oberen Trums 10 sich erstreckende Luftführung erzwungen wird.The inventive, largely enclosed by the machine housing 8 accommodation of the support assembly 5 and the working means 3 makes it possible in an advantageous manner, the working means 3 via the excitation actuator 15, directly or indirectly with the interposition of the transfer member 14, detached, in particular blasted impurities in particular directly via a Machine housing 8 associated with or recorded by the machine housing 8 suction device to detect, which may be constructed and formed in a conventional manner, whereby a corresponding collecting container to the machine housing 8 can be provided removably or detachably. In the figure, such a suction device is indicated schematically at 16 in the form of a blower, which is preferably co-operated via the drive motor 9 of the support arrangement 5 and over which an air duct extending along the upper run 10 is forced.

Hierbei erweist es sich als zweckmäßig, wenn eine Saugöffnung 18 an dem Ende des Maschinengehäuses 8 vorgesehen wird, an dem das als Schleifband 4, gegebenenfalls auch als Polierband ausgebildete Arbeitsmittel 3 aufsteigend aus der Arbeitsebene 100 über die Umlenkrolle 6 der Traganordnung 5 in das Maschinengehäuse 8 einläuft, so dass einerseits der über das Arbeitsmittel 3 mitgenommener Abrieb aus dem Arbeitsbereich abgesaugt wird und andererseits der Saugstrom - symbolisiert über die Pfeile 22 - über das obere Trum 10 bis zu einer bevorzugt insbesondere seitlich am Maschinengehäuse 8 vorgesehenen Auslassöffnung 19 geführt wird. Dabei kann insbesondere auch in dem der Auslassöffnung 19 benachbarten Bereich eine Sammlung des Abriebs erfolgen, zum Beispiel in einem Sammelbeutel, der an den die Auslassöffnung 19 enthaltenden Stutzen angeschlossen ist. Gegebenenfalls kann auch eine in das Gehäuse 8 integrierte Staubsammlung erfolgen. Die Umlaufrichtung 17 für das Arbeitsmittel 3 im Bereich des im Wesentlichen sich in der Arbeitsebene 100 erstreckenden unteren Trums 11 verläuft entgegengesetzt zur Arbeitsrichtung 20 für den dargestellten Bandschleifer 2.It proves to be expedient if a suction opening 18 is provided at the end of the machine housing 8, on which the sanding belt 4, optionally also designed as a polishing tape working means 3 ascending from the working level 100 via the guide roller 6 of the support assembly 5 in the machine housing enters, so that on the one hand sucked through the working means 3 abrasion is sucked out of the work area and on the other hand, the suction - symbolized by the arrows 22 - on the upper run 10 to a preferably laterally provided on the machine housing 8 outlet 19 is performed. In this case, in particular in the region adjacent to the outlet opening 19, a collection of the abrasion can take place, for example in a collecting bag which is connected to the nozzle containing the outlet opening 19. Optionally, a dust collection integrated into the housing 8 can also take place. The direction of rotation 17 for the working means 3 in the area of the lower run 11 extending substantially in the working plane 100 runs counter to the working direction 20 for the belt sander 2 shown.

Zur besseren Handhabung kann der Bandschleifer mit seitlich zum Maschinengehäuse 3 vorgesehenen Handhaben versehen sein.For better handling of the belt grinder may be provided with laterally provided for the machine housing 3 handles.

Durch die Erfindung wird somit ein bevorzugt handgeführter, elektrisch angetriebener Bandschleifer geschaffen, der außerhalb der seitens des Schleifbandes gegebenen Arbeitsebene 100 zum Werkstück in einem freilaufenden Bandbereich über einen Anregungsaktor, insbesondere ein Piezoelement, hochfrequent, direkt oder indirekt, beaufschlagt ist, vor allem um das Schleifband von Anlagerungen zu befreien und damit dessen Arbeitsstruktur freizuhalten.The invention thus provides a preferably hand-guided, electrically driven belt grinder which is subjected to high-frequency, direct or indirect high-frequency, direct or indirect, outside of the working plane 100 to the workpiece in a free-running band area via the excitation actuator, in particular a piezoelectric element To free abrasive belt from deposits and thus to keep its working structure free.

Claims (8)

  1. Power tool, in particular hand power tool (1), comprising a driven carrying arrangement (5) for a working means (3), by means of which a working plane (100) for the working means (3) is defined, wherein the working means (3) is constituted by a revolving sanding belt (4) or polishing belt, which in a region offset from the strand (11) of the belt that extends along the working plane (100), and comprising an excitation actuator (15) that impinges upon the working means (3) at high frequency, characterized in that the excitation actuator (15) impinges upon the sanding belt (4) or polishing belt directly or indirectly in a region of the returning strand offset from the working plane (100) and extending freely between directional turns (6, 7).
  2. Power tool according to Claim 1, characterized in that the directional turns (6, 7) are turnaround rollers (6, 7) of the carrying arrangement (5).
  3. Power tool according to Claim 1 or 2, characterized in that the excitation actuator (15) impinges upon the working means (3) in a contacting or non-contacting manner.
  4. Power tool according to any one of Claims 1 to 3, characterized in that the excitation actuator (15) impinges upon the back side of the working means (3).
  5. Power tool according to any one of the preceding claims, characterized in that the excitation actuator (15) impinges upon the working means (3) orthogonally in relation to the direction of extent.
  6. Power tool according to any one of the preceding claims, characterized in that the excitation actuator (15) impinges upon the sanding belt (4) or polishing belt by means of a strip-type transmission member (14) that lies transversely in relation to the direction of revolution.
  7. Power tool according to any one of the preceding claims, characterized in that the excitation actuator (15) is realized as an element that impinges, in particular in the manner of a strip, upon the sanding belt (4) or polishing belt.
  8. Power tool according to any one of the preceding claims, characterized in that the excitation actuator (15) operates in the ultrasonic range and, in particular, is realized as a piezo element or excites the working means (3) in an oscillatory manner on a magnetic or inductive basis.
EP11749172.0A 2010-09-02 2011-08-29 Machine tool, in particular hand-held machine tool Not-in-force EP2611571B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010040140A DE102010040140A1 (en) 2010-09-02 2010-09-02 Machine tool, in particular hand tool
PCT/EP2011/064788 WO2012028564A1 (en) 2010-09-02 2011-08-29 Machine tool, in particular hand-held machine tool

Publications (2)

Publication Number Publication Date
EP2611571A1 EP2611571A1 (en) 2013-07-10
EP2611571B1 true EP2611571B1 (en) 2014-12-24

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EP11749172.0A Not-in-force EP2611571B1 (en) 2010-09-02 2011-08-29 Machine tool, in particular hand-held machine tool

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US (1) US9327377B2 (en)
EP (1) EP2611571B1 (en)
JP (1) JP5619286B2 (en)
CN (1) CN103079759B (en)
DE (1) DE102010040140A1 (en)
RU (1) RU2013114410A (en)
WO (1) WO2012028564A1 (en)

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EP2650081B1 (en) * 2012-04-13 2013-11-27 Supfina Grieshaber GmbH & Co. KG Method and device for finishing a workpiece surface
DE102013200838A1 (en) 2013-01-21 2014-07-24 Robert Bosch Gmbh Belt grinding machine has electric drive motor for driving grinding line, which is guided by two rollers mounted in housing in rotating manner, where roller is motor-driven, and drive motor is partially integrated in cylindrical roller
JP2014148018A (en) * 2013-02-01 2014-08-21 Makita Corp Hand-held electric polisher
WO2015061370A1 (en) 2013-10-21 2015-04-30 Milwaukee Electric Tool Corporation Adapter for power tool devices
CN106737120B (en) * 2017-01-15 2020-01-07 广州东荣轴承设备有限公司 Super lapping superposes high frequency oscillation device
CN117140326B (en) * 2023-10-31 2024-01-26 南通成科精密铸件有限公司 Surface treatment device for stove castings

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US3430390A (en) * 1965-12-17 1969-03-04 Whittaker Corp Cutting machines and tools for composite materials
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DE10041925A1 (en) 2000-08-25 2002-03-21 Adrian Riegel Grinding process involves bringing workpiece and grinding agent into engagement with feed movement as well as vibrating movement which differs from feed direction
JP2002301643A (en) 2001-04-06 2002-10-15 Asahi Glass Co Ltd Polishing device for glass conveying roller
DE10125483A1 (en) 2001-05-25 2002-11-28 Hilti Ag Grinder with additional movement has grinding mechanism removably attached to grinding shoe movable by actuator with horizontal and vertical movements parallel and normal to surface
JP3867840B2 (en) 2001-09-19 2007-01-17 株式会社日立ハイテクノロジーズ Polishing equipment
DE102004061222B3 (en) 2004-12-20 2006-07-13 Kastriot Merlaku Sanding machine for fine sanding and polishing has sanding element, sandpaper and ultrasound generator to impart vibrations to sander via gel cushion and to refine grinding process

Also Published As

Publication number Publication date
RU2013114410A (en) 2014-10-10
US9327377B2 (en) 2016-05-03
WO2012028564A1 (en) 2012-03-08
US20130331011A1 (en) 2013-12-12
CN103079759B (en) 2016-07-06
JP2013539417A (en) 2013-10-24
CN103079759A (en) 2013-05-01
JP5619286B2 (en) 2014-11-05
EP2611571A1 (en) 2013-07-10
DE102010040140A1 (en) 2012-03-08

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