EP1761361B1 - Method and device for surface blasting gas turbine blades in the area of the roots thereof - Google Patents

Method and device for surface blasting gas turbine blades in the area of the roots thereof Download PDF

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Publication number
EP1761361B1
EP1761361B1 EP05753780A EP05753780A EP1761361B1 EP 1761361 B1 EP1761361 B1 EP 1761361B1 EP 05753780 A EP05753780 A EP 05753780A EP 05753780 A EP05753780 A EP 05753780A EP 1761361 B1 EP1761361 B1 EP 1761361B1
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EP
European Patent Office
Prior art keywords
gas turbine
blade
vibrator
shot peening
ultrasonic sonotrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP05753780A
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German (de)
French (fr)
Other versions
EP1761361A1 (en
Inventor
Erwin Bayer
Thomas Peschke
Holger Polanetzki
Alexander Winkler
Thomas Dautl
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MTU Aero Engines AG
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MTU Aero Engines GmbH
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Publication of EP1761361A1 publication Critical patent/EP1761361A1/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
    • B24B39/00—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor
    • B24B39/006—Peening and tools therefor
    • 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
    • Y10T29/00—Metal working
    • Y10T29/47—Burnishing
    • Y10T29/479—Burnishing by shot peening or blasting
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making
    • Y10T29/49321—Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making
    • Y10T29/49323—Assembling fluid flow directing devices, e.g., stators, diaphragms, nozzles
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making
    • Y10T29/49325—Shaping integrally bladed rotor

Definitions

  • the invention relates to a method for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots.
  • the invention further relates to a device for surface blasting, in particular for ultrasonic blasting, of gas turbine blades in the region of their ends Bucket feet according to the preamble of claim 8.
  • Gas turbines in particular aircraft engines, have at least one rotor equipped with rotating blades, in particular in the area of their compressor and turbine, wherein the rotating blades of the gas turbine are anchored via profiled blade feet in corresponding recesses of the gas turbine rotor.
  • it is possible to profile the blade roots either by the so-called Tannehbaum design or by the so-called dovetail design and anchored in correspondingly profiled recesses of the gas turbine rotor.
  • the preferably fir-tree-profiled or dovetailed surfaces of a blade root of a gas turbine blade are also referred to as wings.
  • the wear rate in the area of the blade roots can be reduced by solidifying the blade roots on their wings by special surface treatment methods.
  • the shot peening is preferably used. In conventional shot peening, significant surface roughening on the airfoils of the blade roots may occur, thereby adversely affecting the accuracy of fit of the blade roots.
  • the gas turbine blades to be machined are aligned such that the profiled bearing surfaces of the blade roots to be machined run substantially perpendicular to the oscillating surface of the ultrasonic sonotrode.
  • the profiled bearing surfaces of the blade roots to be machined run substantially perpendicular to the oscillating surface of the ultrasonic sonotrode.
  • the present invention is based on the problem to provide a novel method and a novel device for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots.
  • the or each gas turbine blade for surface blasting is oriented such that at least one profiled bearing surface of the or each blade root at least at times extends substantially parallel to a vibrating surface of the or each vibrator, in particular the or each ultrasonic sonotrode, during surface blasting the vibrating surface of the or each vibrator is oriented substantially horizontally or horizontally.
  • the gas turbine blades are not positioned as in the prior art, but rather are positioned horizontally in a processing chamber.
  • the quality of processing in surface blasting of the wings over the prior art can be significantly improved.
  • the device according to the invention for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots is defined in claim 8.
  • FIG. 1 shows in highly schematic form a device 10 according to the invention for ultrasonic shot peening of gas turbine blades in the region of their blade roots together with a gas turbine blade 11.
  • the device 10 according to the invention has a vibrator designed as an ultrasonic sonotrode 12 with a substantially horizontal direction Above the vibrating surface 13 of the ultrasonic sonotrode 12, a processing chamber 14 is positioned, wherein in the processing chamber 14 of FIG. 1, a gas turbine blade 11 is arranged with its blade root 15. Laterally projecting in the region of the blade root 15 gas turbine blade 11 projects with its blade 16 out of the processing chamber 14.
  • the processing chamber is bounded on its underside by the vibrating surface 13 of the ultrasonic sonotrode 12, laterally and upwardly by respective covers 17, 18 and 19, respectively.
  • a plurality of balls extending from the oscillating one Surface 13 of the ultrasonic sonotrode accelerated and directed to the blade root 15 of the gas turbine blade 11 to be machined. Under the influence of gravity, the balls return to the area of the oscillating surface 13, in order then to be accelerated or moved again in the direction of the blade root 15 to be processed.
  • the gas turbine blade 11 positioned with the blade root 15 in the processing chamber 14 is aligned for ultrasonic shot peening such that at least one profiled bearing surface of the blade root 15 of the gas turbine blade 11 is parallel to the horizontally or horizontally extending beam , vibrating surface 13 of the ultrasonic sonotrode 12 is aligned.
  • the gas turbine blade 11 is therefore within the processing chamber 14 such that an axis extending from the radially inner end of the blade root 15 in the direction of a radially outer end of the blade 16 in contrast to the prior art according to the US 6,536,109 B2 does not run vertically or vertically, but rather horizontally or horizontally.
  • the spheres of FIG Balls are not directed in a preferred direction on the wings to be machined wings of the blade root 15, but rather with different angles. This results in an efficient solidification on the wings of the blade roots.
  • FIG. 2 shows an embodiment of a device 20 according to the invention for shot peening of gas turbine blades in the region of their blade roots, wherein in the processing chamber 14 of the device 20 in the embodiment of FIG. 2, two gas turbine blades 11 with their blade feet 15 in the sense of the present invention for ultrasonic Shot peening are positioned or aligned in such a way that, during blasting, the supporting surface of the blade roots 15 to be blasted is essentially parallel to the vibrating surface 13 of the ultrasonic sonotrode 12.
  • the device of FIG. 2 is identical to the device of FIG. 1, so that the same reference numbers are used for the same components.
  • FIG. 3 shows a further embodiment of a device 21 according to the invention for shot peening of gas turbine blades in the region of their blade roots, wherein also in connection with the embodiment of Fig. 3 to avoid unnecessary repetition for the same components same reference numerals are used.
  • the embodiment of FIG. 3 differs from the embodiment of FIG. 1 essentially in that the shown gas turbine blade 11 is aligned within the processing chamber 14 during shot peening in such a way with respect to the vibrating surface 13 of the ultrasonic sonotrode 12 that a tangent to projections of one of oscillating surface 13 opposite support surface of the blade root 15 is substantially parallel to the vibrating surface 13 and thus extends substantially in the horizontal direction.
  • the device 21 according to the invention has a device 22 for tilting or pivoting the gas turbine blade 11 within the processing chamber 14.
  • FIGS. 4 and 5 show a further embodiment of a device 23 according to the invention for shot peening gas turbine blades in the region of their blade feet, the device 23 according to FIGS. 4 and 5 again via an ultrasonic sonotrode 24 with a substantially horizontal or horizontal direction extending, vibrating surface 25 features.
  • a processing chamber 26 is positioned, which is shown in highly schematic form in FIG. Within the processing chamber 26, in the exemplary embodiment of FIGS.
  • two gas turbine blades 11 are blasted in the region of their blade roots 15, the gas turbine blades 11 for ultrasonic shot peening in turn being aligned such that at least one airfoil, in particular fir tree profiled or dovetail profiled airfoil, is formed during blasting the blade roots 15 at least temporarily substantially parallel to the oscillating, extending in the horizontal direction surface 25 of the ultrasonic sonotrode 24 extends.
  • the device according to the invention 23 has a revolver-like rotatable support 27 which is rotatable about an axis 29 in the direction of the arrow 28.
  • a plurality of turntable 30 are arranged for receiving gas turbine blades 11.
  • each of the turntables 30 is individually rotatable in the direction of an arrow 31, namely, when the corresponding turntable 30 for processing the positioned on the turntable 30 gas turbine blades 11 in the region of the processing chamber 26 and thus the ultrasonic sonotrode 24 is located.
  • a turntable 30 together with the gas turbine blades 11 positioned on the turntable 30 can be moved into or out of the processing station 26 by turning the revolver-type carrier 27 in the direction of the arrow 28.
  • the corresponding turntable 30 is rotatable in the direction of the arrow 31, so as to ensure a uniform blasting of all wings of the blade roots 15 of the gas turbine blades 11.
  • All embodiments have in common that are aligned for ultrasonic shot peening of gas turbine blades 11 in the region of their blade roots 15 the same so relative to a substantially extending in the horizontal direction, vibrating surface 13 of an ultrasonic sonotrode 12, that to be radiated, in particular fir-profiled or Dovetail profiled wings of the blade roots 15 are aligned parallel to the vibrating surface 13.
  • the gas turbine blades 11 are therefore not aligned within the processing chamber, but rather lying with a horizontal longitudinal axis extending between the radially inner end of the blade root and the radially outer end of the blade of the gas turbine blades. About this longitudinal axis, the gas turbine blades are rotatable during shot peening.
  • the devices according to the invention only ever comprise one sonotrode, which is arranged below the processing chamber. It should be noted that, of course, a plurality of sonotrodes in the region of a processing chamber 26 can be arranged, in which case preferably a sonotrode or a vibrating surface of the sonotrodes is arranged below and another above the processing chamber.
  • an optimized solidification depth and an increased compressive residual stress during ultrasonic shot peening can be achieved compared to the prior art. This is achieved by the inventive alignment of the blade roots during ultrasonic shot peening. By rotating or rotating the blade feet during the ultrasonic shot peening, the quality of the blasted surface can be further improved.

Description

Die Erfindung betrifft ein Verfahren zum Oberflächenstrahlen, insbesonde= re zum Ultraschall-Kugelstrahlen, von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße gemäß dem Oberbegriff des Patentanspruchs 1. Des weiteren betrifft die Erfindung eine Vorrichtung zum Oberflächenstrahlen, insbesondere zum Ultraschall-Kugelstrahlen, von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße nach dem Oberbegriff des Patentanspruchs 8.The invention relates to a method for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots. The invention further relates to a device for surface blasting, in particular for ultrasonic blasting, of gas turbine blades in the region of their ends Bucket feet according to the preamble of claim 8.

Gasturbinen, insbesondere Flugtriebwerke, verfügen insbesondere im Bereich ihres Verdichters sowie ihrer Turbine über mindestens einen mit rotierenden Laufschaufeln bestückten Rotor, wobei die rotierenden Laufschaufeln der Gasturbine über profilierte Schaufelfüße in entsprechenden Ausnehmungen des Gasturbinenrotors verankert sind. Nach dem Stand der Technik ist es möglich, die Schaufelfüße entweder nach dem sogenannten Tannehbaum-Design (fir tree design) oder nach dem sogenannten Schwalbenschwanz-Design (dove tail design) zu profilieren und in entsprechend profilierten Ausnehmungen des Gasturbinenrotors zu verankern. Die vorzugsweise tannenbaumprofilierten oder schwalbenschwanzpröfilierten Flächen eines Schaufelfußes einer Gasturbinenschaufel werden auch als Tragflächen bezeichnet.Gas turbines, in particular aircraft engines, have at least one rotor equipped with rotating blades, in particular in the area of their compressor and turbine, wherein the rotating blades of the gas turbine are anchored via profiled blade feet in corresponding recesses of the gas turbine rotor. According to the prior art, it is possible to profile the blade roots either by the so-called Tannehbaum design or by the so-called dovetail design and anchored in correspondingly profiled recesses of the gas turbine rotor. The preferably fir-tree-profiled or dovetailed surfaces of a blade root of a gas turbine blade are also referred to as wings.

Während des Betriebs einer Gasturbine werden die Schaufelfüße an ihren profilierten Tragflächen insbesondere durch Reibverschleiß stark beansprucht. Die Verschleißrate im Bereich der Schaufelfüße kann dadurch herabgesetzt werden, dass die Schaufelfüße an ihren Tragflächen durch spezielle Oberflächenbearbeitiuzgsverfahren verfestigt werden. Hierbei kommt vorzugsweise das Kugelstrahlen zum Einsatz. Beim konventionellen Kugelstrahlen kann sich eine erhebliche Oberflächenaufrauung an den Tragflächen der Schaufelfüße einstellen, wodurch die Passgenauigkeit der Schaufelfüße negativ beeinträchtigt wird.During operation of a gas turbine blade roots are heavily stressed on their profiled wings in particular by fretting. The wear rate in the area of the blade roots can be reduced by solidifying the blade roots on their wings by special surface treatment methods. Here, the shot peening is preferably used. In conventional shot peening, significant surface roughening on the airfoils of the blade roots may occur, thereby adversely affecting the accuracy of fit of the blade roots.

Zur Verbesserung der sich beim Kugelstrahlen einstellenden Bearbeitungsqualität an zu bearbeitenden Schaufelfüßen von Gasturbinen ist es aus dem Stand der Technik gemäß US 6,536,109 B2 bereits bekannt, die Schaufelfüße im Bereich ihrer profilierten Tragflächen durch sogenanntes Ultraschall-Kugelstrahlen zu verfestigen. So offenbart die US 6,536,109 B2 eine entsprechende Vorrichtung mit einer Ultraschall-Sonotrode, wobei die Ultraschall-Sonotrode eine horizontal bzw. waagrecht verlaufende, vibrierende bzw. schwingende Oberfläche aufweist, und wobei sich oberhalb dieser schwingenden Oberfläche eine Bearbeitungskammer erstreckt, in welcher Gasturbinenschaufeln mit ihren Schaufel füßen zur Bearbeitung derselben im Bereich ihrer Tragflächen stehend angeordnet sind. Gemäß der US 6,536,109 B2 sind dabei die zu bearbeitenden Gasturbinenschaufeln derart stehend ausgerichtet, dass die zu bearbeitenden, profilierten Tragflächen der Schaufelfüße im wesentlichen senkrecht zu der schwingenden Oberfläche der Ultraschall-Sonotrode verlaufen. Hiermit kann nur eine ungenügende Qualität beim Kugelstrahlen der profilierten Tragflächen der Schaufel füße erreicht werden.In order to improve the quality of machining of shot blasting feet of gas turbines that occurs during shot peening, it is according to the state of the art US 6,536,109 B2 already known to solidify the blade roots in the region of their profiled wings by so-called ultrasonic shot peening. So revealed the US 6,536,109 B2 a corresponding device with an ultrasonic sonotrode, wherein the ultrasonic sonotrode a horizontally or horizontally extending, vibrating or vibrating surface, and wherein above this vibrating surface extends a processing chamber in which gas turbine blades are arranged with their blade feet for processing them standing in the region of their wings. According to the US 6,536,109 B2 In this case, the gas turbine blades to be machined are aligned such that the profiled bearing surfaces of the blade roots to be machined run substantially perpendicular to the oscillating surface of the ultrasonic sonotrode. Hereby, only an insufficient quality when shot peening the profiled wings of the blade feet can be achieved.

Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zu Grunde, ein neuartiges Verfahren und eine neuartige Vorrichtung zum Oberflächenstrahlen, insbesondere zum Ultraschall-Kugelstrahlen, von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße zu schaffen.On this basis, the present invention is based on the problem to provide a novel method and a novel device for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots.

Dieses Problem wird durch ein Verfahren zum Oberflächenstrahlen, insbesondere zum Ultraschall-Kugelstrahlen, von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße im Sinne von Patentanspruch 1 gelöst. Erfindungsgemäß wird die oder jede Gasturbinenschaufel zum Oberflächenstrahlen derart ausgerichtet, dass beim Oberflächenstrahlen mindestens eine zu bearbeitende, profilierte Tragfläche des oder jedes Schaufelfußes zumindest zeitweise im wesentlichen parallel zu einer schwingenden Oberfläche des oder jeden Vibrators, insbesondere der oder jeder Ultraschall-Sonotrode, verläuft, wobei die schwingende Oberfläche des oder jeden Vibrators im wesentlichen in horizontaler bzw. waagrechter Richtung ausgerichtet ist.This problem is solved by a method for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots in the sense of claim 1. According to the invention, the or each gas turbine blade for surface blasting is oriented such that at least one profiled bearing surface of the or each blade root at least at times extends substantially parallel to a vibrating surface of the or each vibrator, in particular the or each ultrasonic sonotrode, during surface blasting the vibrating surface of the or each vibrator is oriented substantially horizontally or horizontally.

Im Sinne der hier vorliegenden Erfindung wird vorgeschlagen, zum Oberflächenstrahlen, insbesondere zum Ultraschall-Kugelstrahlen, die Gasturbinenschaufeln bzw. die Schaufelfüße derselben derart auszurichten, dass zumindest eine zu bearbeitende, vorzugsweise tannenbaumprofilierte bzw. schwalbenschwanzprofilierte Tragfläche der Schaufelfüße im Wesentlichen parallel zu der in horizontaler Richtung verlaufenden, schwingenden Ober= fläche des Vibrators ausgerichtet ist. Die Gasturbinenschaufeln sind demnach nicht wie im Stand der Technik stehend, sondern vielmehr liegend in einer Bearbeitungskammer positioniert. Hiermit kann die Bearbeitungsqualität beim Oberflächenstrahlen der Tragflächen gegenüber dem Stand der Technik deutlich verbessert werden.For the purposes of the present invention, it is proposed for surface blasting, in particular for ultrasonic shot peening, to align the gas turbine blades or the blade roots thereof such that at least one supporting surface, preferably fir-profiled or dovetail-profiled, of the blade roots is substantially parallel to that in the horizontal direction extending vibrating vibrating surface of the vibrator is aligned. Accordingly, the gas turbine blades are not positioned as in the prior art, but rather are positioned horizontally in a processing chamber. Hereby, the quality of processing in surface blasting of the wings over the prior art can be significantly improved.

Nach einer bevorzugten Weiterbildung der Erfindung wird die oder jede Gasturbinenschaufel zum Oberflächenstrahlen um eine im wesentlichen parallel zu der schwingenden Oberfläche des oder jeden Vibrators, insbesondere der oder jeder Ultraschall-Sonotrode, verlaufende Achse gedreht.According to a preferred embodiment of the invention, the or each gas turbine blade for surface blasting to a substantially parallel turned to the vibrating surface of the or each vibrator, in particular the or each ultrasonic sonotrode, extending axis.

Die erfindungsgemäße Vorrichtung zum Oberflächenstrahlen, insbesondere zum Ultraschall-Kugelstrahlen, von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße ist im Patentanspruch 8 definiert.The device according to the invention for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots is defined in claim 8.

Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Ausführungsbeispiele der Erfindung werden, ohne hierauf beschränkt zu sein, an Hand der Zeichnung näher erläutert. Dabei zeigt:

Fig. 1
eine stark schematisierte Darstellung einer erfindungsgemäßen Vorrichtung zum Oberflächenstrahlen, insbesondere zum Ultraschall-Kugelstrahlen, von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße nach einem ersten Ausführungsbeispiel der Erfindung;
Fig. 2
eine stark schematisierte Darstellung einer erfindungsgemäßen Vorrichtung zum Oberflächenstrahlen, insbesondere zum Ultraschalt-Kugelstrahlen, von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße nach einem zweiten Ausführungsbeispiel der Erfindung;
Fig. 3
eine stark schematisierte Darstellung einer erfindungsgemäßen Vorrichtung zum Oberflächenstrahlen, insbesondere zum Ultraschall-Kugelstrahlen, von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße nach einem dritten Ausführungsbeispiel der Erfindung;
Fig. 4
eine stark schematisierte Darstellung einer erfindungsgemäßen Vorrichtung zum Oberflächenstrahlen, insbesondere zum Ultraschall-Kugelstrahlen, von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße nach einem weiteren Ausführungsbeispiel der Erfindung; und
Fig. 5
eine Ansicht auf die Vorrichtung der Fig. 4 in Blickrichtung V gemäß Fig. 4.
Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
Fig. 1
a highly schematic representation of a device according to the invention for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots according to a first embodiment of the invention;
Fig. 2
a highly schematic representation of a device according to the invention for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots according to a second embodiment of the invention;
Fig. 3
a highly schematic representation of an apparatus according to the invention for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots according to a third embodiment of the invention;
Fig. 4
a highly schematic representation of a device according to the invention for surface blasting, in particular for ultrasonic shot peening, of gas turbine blades in the region of their blade roots according to a further embodiment of the invention; and
Fig. 5
a view of the device of Fig. 4 in the viewing direction V of FIG. 4th

Nachfolgend wird die hier vorliegende Erfindung unter Bezugnahme auf Fig. 1 bis 5 in größerem Detail beschrieben.Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 to 5.

Fig. 1 zeigt stark schematisiert eine erfindungsgemäße Vorrichtung 10 zum Ultraschall-Kugelstrahlen von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße zusammen mit einer Gasturbinenschaufel 11. Die erfindungsgemäße Vorrichtung 10 verfügt über einen als Ultraschall-Sonotrode 12 ausgebildeten Vibrator mit einer im Wesentlichen in horizontaler Richtung bzw. waagrechter Richtung verlaufenden, vibrierenden bzw. schwingenden Oberfläche 13. Oberhalb der schwingenden Oberfläche 13 der Ultraschall-Sonotrode 12 ist eine Bearbeitungskammer 14 positioniert, wobei in der Bearbeitungskammer 14 gemäß Fig. 1 eine Gasturbinenschaufel 11 mit ihrem Schaufelfuß 15 angeordnet ist. Seitlich ragt die im Bereich des Schaufelfußes 15 zu bearbeitende Gasturbinenschaufel 11 mit ihrem Schaufelblatt 16 aus der Bearbeitungskammer 14 heraus. Wie bereits erwähnt, wird die Bearbeitungskammer an ihrer Unterseite von der schwingenden Oberfläche 13 der Ultraschall-Sonotrode 12 begrenzt, seitlich sowie oben durch entsprechende Abdeckungen 17, 18 bzw. 19. Innerhalb der Bearbeitungskammer 14 sind eine Vielzahl von Kugeln positioniert, die von der schwingenden Oberfläche 13 der Ultraschall-Sonotrode beschleunigt und auf den zu bearbeitenden Schaufelfuß 15 der Gasturbinenschaufel 11 gerichtet werden. Unter dem Einfluss der Schwerkraft gelangen die Kugeln wieder in den Bereich der schwingenden Oberfläche 13, um dann erneut in Richtung auf den zu bearbeitenden Schaufelfuß 15 beschleunigt bzw. bewegt zu werden.FIG. 1 shows in highly schematic form a device 10 according to the invention for ultrasonic shot peening of gas turbine blades in the region of their blade roots together with a gas turbine blade 11. The device 10 according to the invention has a vibrator designed as an ultrasonic sonotrode 12 with a substantially horizontal direction Above the vibrating surface 13 of the ultrasonic sonotrode 12, a processing chamber 14 is positioned, wherein in the processing chamber 14 of FIG. 1, a gas turbine blade 11 is arranged with its blade root 15. Laterally projecting in the region of the blade root 15 gas turbine blade 11 projects with its blade 16 out of the processing chamber 14. As already mentioned, the processing chamber is bounded on its underside by the vibrating surface 13 of the ultrasonic sonotrode 12, laterally and upwardly by respective covers 17, 18 and 19, respectively. Within the processing chamber 14 are positioned a plurality of balls extending from the oscillating one Surface 13 of the ultrasonic sonotrode accelerated and directed to the blade root 15 of the gas turbine blade 11 to be machined. Under the influence of gravity, the balls return to the area of the oscillating surface 13, in order then to be accelerated or moved again in the direction of the blade root 15 to be processed.

Im Sinne der hier vorliegenden Erfindung wird die mit dem Schaufelfuß 15 in der Bearbeitungskammer 14 positionierte Gasturbinenschaufel 11 zum Ultraschall-Kugelstrahlen derart ausgerichtet, dass beim Strahlen mindestens eine zu bearbeitende, profilierte Tragfläche des Schaufelfußes 15 der Gasturbinenschaufel 11 parallel zu der waagrecht bzw. horizontal verlaufenden, schwingenden Oberfläche 13 der Ultraschall-Sonotrode 12 ausgerichtet ist. Die Gasturbinenschaufel 11 liegt demnach innerhalb der Bearbeitungskammer 14 derart, dass eine sich vom radial innenliegenden Ende des Schaufelfußes 15 in Richtung auf ein radial außenliegendes Ende des Schaufelblatts 16 erstreckende Achse im Unterschied zum Stand der Technik gemäß der US 6,536,109 B2 nicht senkrecht bzw. vertikal verläuft, sondern vielmehr horizontal bzw. waagrecht.For the purposes of the present invention, the gas turbine blade 11 positioned with the blade root 15 in the processing chamber 14 is aligned for ultrasonic shot peening such that at least one profiled bearing surface of the blade root 15 of the gas turbine blade 11 is parallel to the horizontally or horizontally extending beam , vibrating surface 13 of the ultrasonic sonotrode 12 is aligned. The gas turbine blade 11 is therefore within the processing chamber 14 such that an axis extending from the radially inner end of the blade root 15 in the direction of a radially outer end of the blade 16 in contrast to the prior art according to the US 6,536,109 B2 does not run vertically or vertically, but rather horizontally or horizontally.

Bedingt durch die erfindungsgemäße Ausrichtung der Schaufelfüße während dem Ulstraschall-Kugelstrahlen geben die über die Ultraschall-Sonotrode beschleunigten Kugeln ihren Impuls direkt auf die zu verfestigenden Tragflächen des Schaufelfußes ab. Hierdurch können hohe Verfestigungstiefen und Druckeigenspannungen an den Tragflächen des Schaufelfußes erzielt werden. Es stellt sich demnach eine direkte Verfestigung der zu strahlenden Tragflächen der Schaufelfüße ein. Es sind kürzere Bearbeitungszeiten bzw. Strahlzeiten realisierbar als beim Stand der Technik.Due to the inventive alignment of the blade roots during the ultrasonic collision shot peening the balls accelerated via the ultrasonic sonotrode release their impulse directly onto the bearing surfaces of the blade root to be consolidated. As a result, high solidification depths and residual compressive stresses can be achieved on the wings of the blade root. Accordingly, a direct solidification of the radiating wings of the blade roots arises. There are shorter processing times or beam times feasible than in the prior art.

Da die Kugeln während des Strahlens von den Abdeckungen 17, 18 und 19 der Bearbeitungskammer 14 ebenso wie von der schwingenden Oberfläche 13 der Sonotrode 12 mit unterschiedlichen Winkeln reflektiert werden, werden die Kugeln nicht in einer Vorzugsrichtung auf die zu bearbeitenden Tragflächen des Schaufelfußes 15 gerichtet, sondern vielmehr mit unterschiedlichen Winkeln. Hierdurch kommt es zu einer effizienten Verfestigung an den Tragflächen der Schaufelfüße.Since the spheres are reflected by the covers 17, 18 and 19 of the processing chamber 14 as well as the vibrating surface 13 of the sonotrode 12 at different angles during the blasting, the spheres of FIG Balls are not directed in a preferred direction on the wings to be machined wings of the blade root 15, but rather with different angles. This results in an efficient solidification on the wings of the blade roots.

Im Ausführungsbeispiel der Fig. 1 ist lediglich eine Gasturbinenschaufel 11 mit dem an den Tragflächen zu bearbeitenden Schaufelfuß innerhalb der Bearbeitungskammer 14 positioniert. Fig. 2 zeigt ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung 20 zum Kugelstrahlen von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße, wobei in der Bearbeitungskammer 14 der Vorrichtung 20 im Ausführungsbeispiel der Fig. 2 zwei Gasturbinenschaufeln 11 mit ihren Schaufel füßen 15 im Sinne der hier vorliegenden Erfindung zum Ultraschall-Kugelstrahlen derart positioniert bzw. ausgerichtet sind, dass beim Strahlen die zu strahlende Tragfläche der Schaufelfüße 15 im Wesentlichen parallel zur schwingenden Oberfläche 13 der Ultraschall-Sonotrode 12 verläuft. Hinsichtlich der weiteren Details stimmt jedoch die Vorrichtung der Fig. 2 mit der Vorrichtung der Fig. 1 überein, sodass für gleiche Baugruppen gleiche Bezugsziffern verwendet werden.In the embodiment of FIG. 1, only one gas turbine blade 11 is positioned within the processing chamber 14 with the blade root to be machined on the wings. 2 shows an embodiment of a device 20 according to the invention for shot peening of gas turbine blades in the region of their blade roots, wherein in the processing chamber 14 of the device 20 in the embodiment of FIG. 2, two gas turbine blades 11 with their blade feet 15 in the sense of the present invention for ultrasonic Shot peening are positioned or aligned in such a way that, during blasting, the supporting surface of the blade roots 15 to be blasted is essentially parallel to the vibrating surface 13 of the ultrasonic sonotrode 12. With regard to the further details, however, the device of FIG. 2 is identical to the device of FIG. 1, so that the same reference numbers are used for the same components.

Fig. 3 zeigt ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung 21 zum Kugelstrahlen von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße, wobei auch im Zusammenhang mit dem Ausführungsbeispiel der Fig. 3 zur Vermeidung unnötiger Wiederholungen für gleiche Baugruppen gleiche Bezugsziffern verwendet werden. Das Ausführungsbeispiel der Fig. 3 unterscheidet sich vom Ausführungsbeispiel der Fig. 1 im Wesentlichen dadurch, dass die gezeigte Gasturbinenschaufel 11 innerhalb der Bearbeitungskammer 14 beim Kugelstrahlen derart gegenüber der schwingenden Oberfläche 13 der Ultraschall-Sonotrode 12 ausgerichtet ist, dass eine Tangente an Vorsprünge einer der schwingenden Oberfläche 13 gegenüberliegenden Tragfläche des Schaufelfußes 15 im Wesentlichen parallel zu der schwingenden Oberfläche 13 und damit im Wesentlichen in horizontaler Richtung verläuft. Hierzu verfügt die erfindungsgemäße Vorrichtung 21 über eine Einrichtung 22 zum Kippen bzw. Schwenken der Gasturbinenschaufel 11 innerhalb der Bearbeitungskammer 14.Fig. 3 shows a further embodiment of a device 21 according to the invention for shot peening of gas turbine blades in the region of their blade roots, wherein also in connection with the embodiment of Fig. 3 to avoid unnecessary repetition for the same components same reference numerals are used. The embodiment of FIG. 3 differs from the embodiment of FIG. 1 essentially in that the shown gas turbine blade 11 is aligned within the processing chamber 14 during shot peening in such a way with respect to the vibrating surface 13 of the ultrasonic sonotrode 12 that a tangent to projections of one of oscillating surface 13 opposite support surface of the blade root 15 is substantially parallel to the vibrating surface 13 and thus extends substantially in the horizontal direction. For this purpose, the device 21 according to the invention has a device 22 for tilting or pivoting the gas turbine blade 11 within the processing chamber 14.

Es sei an dieser Stelle darauf hingewiesen, dass im Zusammenhang mit den Ausführungsbeispielen gemäß Fig. 1 bis 3 während des Ultraschall-Kugelstrahlens alle gezeigten Gasturbinenschaufel 11 um eine im Wesentlichen parallel zu der schwingenden Oberfläche 13 der Ultraschall-Sonotrode 12 verlaufende und damit in horizontaler Richtung verlaufender Achse gedreht werden können. Das Drehen der Schaufelfüße um diese im Wesentlichen in horizontaler Richtung verlaufender Achse kann entweder während des Kugelstrahlens kontinuierlich oder intermittierend bzw. diskontinuierlich durchgeführt werden. Hierdurch ist gewährleistet, dass sämtliche zu strahlenden Tragflächen gleichmäßig durch die über die Ultraschall-Sonotrode 12 beschleunigten Kugeln gestrahlt werden.It should be noted at this point that in connection with the exemplary embodiments according to FIGS. 1 to 3 during the ultrasonic shot peening, all gas turbine blades 11 shown extend around a substantially parallel to the vibrating surface 13 of the ultrasonic sonotrode 12 and thus in the horizontal direction extending axis can be rotated. Turning the paddles about this substantially in the horizontal direction extending axis can be carried out either during the shot peening continuously or intermittently or discontinuously. This ensures that all surfaces to be radiated are uniformly blasted through the balls accelerated over the ultrasonic sonotrode 12.

Fig. 4 und 5 zeigen ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung 23 zum Kugelstrahlen von Gasturbinenschaufeln im Bereich ihrer Schaufelfüße, wobei die Vorrichtung 23 gemäß Fig. 4 und 5 wiederum über eine Ultraschall-Sonotrode 24 mit einer sich im Wesentlichen in horizontaler bzw. waagrechter Richtung erstreckenden, schwingenden Oberfläche 25 verfügt. Oberhalb der schwingenden Oberfläche 25 der Ultraschall-Sonotrode 24 ist wiederum eine Bearbeitungskammer 26 positioniert, die in Fig. 5 stark schematisiert dargestellt ist. Innerhalb der Bearbeitungskammer 26 werden im Ausführungsbeispiel der Fig. 4 und 5 zwei Gasturbinenschaufeln 11 im Bereich ihrer Schaufelfüße 15 gestrahlt, wobei die Gasturbinenschaufeln 11 zum Ultraschall-Kugelstrahlen wiederum derart ausgerichtet sind, dass beim Strahlen mindestens eine zu bearbeitende, insbesondere tannenbaumprofilierte bzw. schwalbenschwanzprofilierte Tragfläche der Schaufelfüße 15 zumindest zeitweise im Wesentlichen parallel zu der schwingenden, sich in horizontaler Richtung erstreckenden Oberfläche 25 der Ultraschall-Sonotrode 24 verläuft.4 and 5 show a further embodiment of a device 23 according to the invention for shot peening gas turbine blades in the region of their blade feet, the device 23 according to FIGS. 4 and 5 again via an ultrasonic sonotrode 24 with a substantially horizontal or horizontal direction extending, vibrating surface 25 features. Above the oscillating surface 25 of the ultrasonic sonotrode 24, in turn, a processing chamber 26 is positioned, which is shown in highly schematic form in FIG. Within the processing chamber 26, in the exemplary embodiment of FIGS. 4 and 5, two gas turbine blades 11 are blasted in the region of their blade roots 15, the gas turbine blades 11 for ultrasonic shot peening in turn being aligned such that at least one airfoil, in particular fir tree profiled or dovetail profiled airfoil, is formed during blasting the blade roots 15 at least temporarily substantially parallel to the oscillating, extending in the horizontal direction surface 25 of the ultrasonic sonotrode 24 extends.

Im Ausführungsbeispiel der Fig. 4 und 5 verfügt die erfindungsgemäße Vorrichtung 23 über einen revolverartig drehbaren Träger 27, der im Sinne des Pfeils 28 um eine Achse 29 drehbar ist. Über den Umfang des Trägers 27 verteilt, sind mehrere Drehteller 30 zur Aufnahme von Gasturbinenschaufeln 11 angeordnet. Alle Drehteller 30 sind einerseits in Richtung des Pfeils 28 gemeinsam um die Achse 29 drehbar, andererseits ist jeder der Drehteller 30 individuell im Sinne eines Pfeils 31 drehbar, nämlich dann, wenn sich der entsprechende Drehteller 30 zur Bearbeitung der auf dem Drehteller 30 positionierten Gasturbinenschaufeln 11 im Bereich der Bearbeitungskammer 26 und damit der Ultraschall-Sonotrode 24 befindet. Über das Drehen des revolverartigen Trägers 27 im Sinne des Pfeils 28 ist demnach immer ein Drehteller 30 zusammen mit den auf dem Drehteller 30 positionierten Gasturbinenschaufeln 11 in die Bearbeitungsstation 26 hineinbewegbar bzw. aus derselben herausbewegbar. Während des Bearbeitens von zwei Gasturbinenschaufeln innerhalb der Bearbeitungsstation 26 ist der entsprechende Drehteller 30 im Sinne des Pfeils 31 drehbar, um so ein gleichmäßiges Strahlen aller Tragflächen der Schaufelfüße 15 der Gasturbinenschaufeln 11 zu gewährleisten.In the embodiment of FIGS. 4 and 5, the device according to the invention 23 has a revolver-like rotatable support 27 which is rotatable about an axis 29 in the direction of the arrow 28. Distributed over the circumference of the carrier 27, a plurality of turntable 30 are arranged for receiving gas turbine blades 11. On the other hand, each of the turntables 30 is individually rotatable in the direction of an arrow 31, namely, when the corresponding turntable 30 for processing the positioned on the turntable 30 gas turbine blades 11 in the region of the processing chamber 26 and thus the ultrasonic sonotrode 24 is located. Accordingly, a turntable 30 together with the gas turbine blades 11 positioned on the turntable 30 can be moved into or out of the processing station 26 by turning the revolver-type carrier 27 in the direction of the arrow 28. During the machining of two gas turbine blades within the processing station 26, the corresponding turntable 30 is rotatable in the direction of the arrow 31, so as to ensure a uniform blasting of all wings of the blade roots 15 of the gas turbine blades 11.

Allen Ausführungsbeispielen ist gemeinsam, dass zum Ultraschall-Kugelstrahlen von Gasturbinenschaufeln 11 im Bereich ihrer Schaufelfüße 15 dieselben derart relativ zu einer im Wesentlichen in horizontaler Richtung verlaufenden, schwingenden Oberfläche 13 einer Ultraschall-Sonotrode 12 ausgerichtet werden, dass die zu strahlenden, insbesondere tannenbaumprofilierten bzw. schwalbenschwanzprofilierten Tragflächen der Schaufelfüße 15 parallel zur schwingenden Oberfläche 13 ausgerichtet sind. Die Gasturbinenschaufeln 11 sind demnach nicht stehend innerhalb der Bearbeitungskammer ausgerichtet, sondern vielmehr liegend mit einer horizontal verlaufenden Längsachse, die sich zwischen dem radial innenliegenden Ende des Schaufelfußes und dem radial außenliegenden Ende des Schaufelblatts der Gasturbinenschaufeln erstreckt. Um diese Längsachse sind die Gasturbinenschaufeln während des Kugelstrahlens drehbar.All embodiments have in common that are aligned for ultrasonic shot peening of gas turbine blades 11 in the region of their blade roots 15 the same so relative to a substantially extending in the horizontal direction, vibrating surface 13 of an ultrasonic sonotrode 12, that to be radiated, in particular fir-profiled or Dovetail profiled wings of the blade roots 15 are aligned parallel to the vibrating surface 13. The gas turbine blades 11 are therefore not aligned within the processing chamber, but rather lying with a horizontal longitudinal axis extending between the radially inner end of the blade root and the radially outer end of the blade of the gas turbine blades. About this longitudinal axis, the gas turbine blades are rotatable during shot peening.

In den gezeigten Ausführungsbeispielen umfassen die erfindungsgemäßen Vorrichtungen lediglich immer nur eine Sonotrode, die unterhalb der Bearbeitungskammer angeordnet ist. Es sei darauf hingewiesen, dass selbstverständlich auch mehrere Sonotroden im Bereich einer Bearbeitungskammer 26 angeordnet werden können, wobei dann vorzugsweise eine Sonotrode bzw. eine schwingende Oberfläche der Sonotroden unterhalb und eine andere oberhalb der Bearbeitungskammer angeordnet ist.In the exemplary embodiments shown, the devices according to the invention only ever comprise one sonotrode, which is arranged below the processing chamber. It should be noted that, of course, a plurality of sonotrodes in the region of a processing chamber 26 can be arranged, in which case preferably a sonotrode or a vibrating surface of the sonotrodes is arranged below and another above the processing chamber.

Mit der hier vorliegenden Erfindung ist gegenüber dem Stand der Technik eine optimierten Verfestigungstiefe sowie eine erhöhte Druckeigenspannung beim Ultraschall-Kugelstrahlen erreichbar. Dies wird durch die erfindungsgemäße Ausrichtung der Schaufelfüße während des Ultraschall-Kugelstrahlens erzielt. Durch ein Rotieren bzw. Drehen der Schaufelfüße während des Ultraschall-Kugelstrahlens kann die Qualität der gestrahlten Oberfläche nochmals verbessert werden.With the present invention, an optimized solidification depth and an increased compressive residual stress during ultrasonic shot peening can be achieved compared to the prior art. This is achieved by the inventive alignment of the blade roots during ultrasonic shot peening. By rotating or rotating the blade feet during the ultrasonic shot peening, the quality of the blasted surface can be further improved.

Claims (13)

  1. Method of surface blasting, in particular ultrasonically shot peening, gas turbine blades in the area of their blade roots, whereby accelerated spheres are directed towards a blade root of at least one gas turbine blade with the aid of at least one vibrator, in particular at least one ultrasonic sonotrode, in order to process it in the area of at least one profiled support surface, in particular profiled to a fir tree design or profiled to a dove tail design,
    characterised in that
    the or each gas turbine blade is oriented such for the purpose of surface blasting that at least one profiled support surface of the or each blade root which has to be processed extends essentially parallel with an oscillating surface of the or each vibrator, in particular of the or each ultrasonic sonotrode, at least some of the time during blasting.
  2. Method as claimed in claim 1,
    characterised in that
    the or each vibrator, in particular the or each ultrasonic sonotrode, is positioned so that an oscillating surface of the or each vibrator extends essentially in the horizontal direction.
  3. Method as claimed in claim 1 or 2,
    characterised in that for the shot peening process, the or each gas turbine blade is oriented so that at least one profiled support surface which has to be processed extends essentially parallel with the oscillating surface of the or each vibrator, in particular of the or each ultrasonic sonotrode, and hence in the essentially horizontal direction for at least some of the time.
  4. Method as claimed in one of claims 1 to 3,
    characterised in that
    for the shot peening process, the or each gas turbine blade is oriented so that a tangent at projections of a profiled support surface extends essentially parallel with the oscillating surface of a vibrator, in particular of an ultrasonic sonotrode, at least some of the time.
  5. Method as claimed in one of claims 1 to 3,
    characterised in that
    the or each gas turbine blade is positioned lying down for the shot peening process so that an axis extending from the end of a blade root lying radially inwards in the direction towards an end of the blade vane lying radially outwards extends essentially parallel with the oscillating surface of the or reach vibrator, in particular of the or each ultrasonic sonotrode.
  6. Method as claimed in one of claims 1 to 5,
    characterised in that for the shot peening process, the or each gas turbine blade is rotated about an axis extending essentially parallel with the oscillating surface of the or each vibrator, in particular of the or each ultrasonic sonotrode.
  7. Method as claimed in claim 6,
    characterised in that
    for the shot peening process, the or each gas turbine blade is rotated about an axis extending from the end of the blade root lying radially inwards towards the end of the blade vane lying radially outwards.
  8. Device for surface blasting, in particular ultrasonically shot peening, gas turbine blades (11) in the area of their blade roots (15), with at least one vibrator with an oscillating surface (13, 25), in particular with at least one ultrasonic sonotrode (12, 24), and the or each vibrator is oriented so that the oscillating surface of the or each vibrator extends essentially in the horizontal direction, and the or each oscillating surface is adjoined by a processing chamber (14, 26) for accommodating the or each blade root (15) which has to be processed,
    characterised in that
    the processing chamber (14, 26) has at least one cut-out or opening in the region of at least one of its covers (17, 18, 19) for moving the blade root (15) of at least one gas turbine blade (11) in and out, and at least one mechanism (22, 27, 30) is provided for displacement and positioning purposes by means of which the or each gas turbine blade (11) can be oriented for the surface blasting process so that at least one profiled support surface of the or each blade root (15) which has to be processed extends essentially parallel with the oscillating surface (13, 25) of the or each vibrator, in particular of the or each ultrasonic sonotrode (12, 24), for at least some of the time.
  9. Device as claimed in claim 8,
    characterised in that
    the processing chamber (14, 26) is designed so that the or each gas turbine blade (11) can be oriented in such a way for the shot peening process that an axis extending from the end of a blade root lying radially inwards in the direction towards an end of a blade vane lying radially outwards extends essentially parallel with the oscillating surface of the or each vibrator, in particular of the or each ultrasonic sonotrode.
  10. Device as claimed in claim 8 or 9,
    characterised in that for the shot peening process, the or each gas turbine blade (11) can be rotated inside the processing chamber (14, 26) about an axis extending essentially parallel with the oscillating surface (13, 25) of the or each vibrator, in particular of the or each ultrasonic sonotrode (12, 24), preferably about the axis extending from the end of the blade root (15) lying radially inwards in the direction towards the end of the blade vane (16) lying radially outwards.
  11. Device as claimed in one of claims 8 to 10,
    characterised by
    a revolver-type rotatable support (27), on which several gas turbine blades (11) are positioned in the circumferential direction and when the support (27) is rotated, at least one of the gas turbine blades can be can be moved respectively into the processing chamber (26) or moved out of it.
  12. Device as claimed in claim 11,
    characterised in that
    the support (27) has several rotating plates (30) spaced apart from one another in the circumferential direction for accommodating preferably two gas turbine blades (11) respectively.
  13. Device as claimed in claim 12,
    characterised in that
    every rotating plate (30) can be rotated about an individual rotating plate axis on the one hand and all the rotating plates (30) can be jointly rotated about an axis of the revolver-type support (27) on the other hand.
EP05753780A 2004-06-19 2005-06-08 Method and device for surface blasting gas turbine blades in the area of the roots thereof Active EP1761361B1 (en)

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PCT/DE2005/001022 WO2005123338A1 (en) 2004-06-19 2005-06-08 Method and device for surface blasting gas turbine blades in the area of the roots thereof

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DE102004029546A1 (en) 2006-01-05
US20070214640A1 (en) 2007-09-20
EP1761361A1 (en) 2007-03-14
WO2005123338A1 (en) 2005-12-29
DE502005002115D1 (en) 2008-01-10
US7481088B2 (en) 2009-01-27

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