WO2009056100A2 - Procédé de fabrication d'une couche de protection - Google Patents

Procédé de fabrication d'une couche de protection Download PDF

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Publication number
WO2009056100A2
WO2009056100A2 PCT/DE2008/001726 DE2008001726W WO2009056100A2 WO 2009056100 A2 WO2009056100 A2 WO 2009056100A2 DE 2008001726 W DE2008001726 W DE 2008001726W WO 2009056100 A2 WO2009056100 A2 WO 2009056100A2
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
passivation layer
electrolyte
component
electrode
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.)
Ceased
Application number
PCT/DE2008/001726
Other languages
German (de)
English (en)
Other versions
WO2009056100A3 (fr
Inventor
Matija Burger
Helena Catalan-Asenjo
Albin Platz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MTU Aero Engines AG
Original Assignee
MTU Aero Engines GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MTU Aero Engines GmbH filed Critical MTU Aero Engines GmbH
Publication of WO2009056100A2 publication Critical patent/WO2009056100A2/fr
Publication of WO2009056100A3 publication Critical patent/WO2009056100A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B23H3/10—Supply or regeneration of working media
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B23H3/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/38—Influencing metal working by using specially adapted means not directly involved in the removal of metal, e.g. ultrasonic waves, magnetic fields or laser irradiation

Definitions

  • the present invention relates to a method for producing a protective layer on a metallic workpiece to be machined by means of an electrochemical machining method.
  • the invention furthermore relates to a component produced by means of the method according to the invention and to uses of the method according to the invention.
  • electrochemical sinking is a method for the exact and very precise machining of surfaces.
  • electrochemical sinking the surface of the workpiece is usually machined with an electrode, whereby by electrochemical reaction of the workpiece with the between the workpiece and The electrolyte located on the electrode is carried out a removal of material on the workpiece.
  • ECM electrochemical machining
  • PECM pulsesed electrochemical machining
  • the spacing can be reduced to sizes in the range of 1 to 100 microns and below.
  • adjacent areas are attacked by the electrochemical process and partially removed by the known electrochemical lowering.
  • the removal leads to an undesirable change in the geometry, so that usually drawing tolerances are exceeded.
  • Such inaccuracies are undesirable, especially in engine construction. In particular, they prevent that even further automation in the production of said components can be achieved. It is therefore an object of the present invention to provide a method for producing a protective layer on a metallic workpiece to be machined by means of an electrochemical machining method, which ensures reliable protection against undesired electrochemical removal on surfaces of the workpiece that are not to be machined.
  • a method according to the invention for producing a protective layer on a metallic workpiece to be machined by means of an electrochemical machining method is characterized in that a voltage is applied between at least one electrode and at least one partial area of the workpiece, which is dependent on the metallic composition of the at least one partial area of the workpiece Workpiece produced in this area via an electrolyte, an electrically non-conductive passivation layer on the workpiece surface.
  • the resulting protective layer in particular a resulting oxide layer of the metallic material of the workpiece protects the workpiece in the further electrochemical processing of the non-passivated neighboring areas.
  • the electrochemical machining process can be an electrochemical deposition process.
  • the generation of the passivation layer takes place immediately after the machining of at least one partial region of the workpiece.
  • the workpiece may be a blade of a gas turbine or a low-pressure or high-pressure compressor.
  • the passivation layer is produced on the already working blade by machining a corresponding blade. Through this targeted passivation, this blade is reliably protected when processing a neighboring bucket. An undesirable removal of adjacent blades, especially in electrochemical lowering process is reliably prevented.
  • passivation layers are known as process-inhibiting layers from the prior art, since they usually lead to disturbances in the electrochemical machining process, often with subsequent short-circuits.
  • the method according to the invention makes use of the passivation properties of such passivation layers and uses the latter as desired protective layers.
  • the workpiece consists of a nickel, cobalt, iron or titanium alloy. These metallic materials have different passivation potentials. In a certain voltage range, the passivation of the surface occurs in the presence of an electrolyte. If the voltage range is exceeded, electrochemical removal takes place.
  • the applied voltage is a DC voltage.
  • the voltage is pulsed with a duty cycle between 1 and 100. A pulsed voltage is particularly advantageous in electrochemical lowering, in which the corresponding ablation electrode is brought very close to the workpiece to be machined.
  • the distance between the electrode and the workpiece surface is usually 0.01 mm to 10 mm.
  • the electrolyte is a 1% to 25% saline solution.
  • the salt solution may be a nitrate or chloride solution and have a pH between 6 and 11.
  • the formation of the passivation layer can also be controlled or influenced by a change in the pH of the electrolyte.
  • the E lektrolyt an electrolyte temperature of 5 0 C and comprising 50 ° C.
  • the passivation layer is removed after the completion of the workpiece.
  • the passivation layer can be removed by means of an abrasive wet-blasting process or a vibratory finishing process. The removal of the passivation layer is readily possible since it usually only has a thickness between 1 .mu.m and 15 .mu.m.
  • a component according to the invention of a gas turbine or of a low-pressure or high-pressure compressor has at least one workpiece produced by the method according to the invention described above.
  • This advantageously ensures that the component can be produced relatively simply, quickly and in particular automatically, since undesired subsequent removal of already processed partial surfaces of the workpiece or of the component is reliably prevented.
  • the production of custom-fit blades on blisks or blings can be done automatically.
  • the protective layer formed as a passivation layer acts on the component or the workpiece as a corrosion protection layer, which counteracts a possible deeper-reaching corrosion of the workpiece surface.
  • the process according to the invention is used in the production and repair of engine components made of nickel or titanium-based alloys, in particular the manufacture and repair of blade profiles.
  • Another use of the method according to the invention is the production and repair of engine components, in particular the manufacture and repair of integral rotor designs.
  • This relates in particular to a rotor blade and a rotor disk consisting of a single piece (blisk) and rotor blades (bling) produced integrally with a supporting ring.
  • Figure 1 is a schematic representation of a processed according to the invention workpiece.
  • FIG. 1 shows a schematic representation of a workpiece 10 processed by means of an electrochemical lowering method.
  • the workpiece 10 is an engine blade, in particular a blisk or a bling.
  • the workpiece 10 is surrounded at least in the partial region of the blade by two removal electrodes 12, 14. Between the workpiece surface and the electrodes 12, 14, a gap is formed through which an electrolyte 16 flows.
  • the gap width is usually 0.01 mm to 10 mm.
  • the electrolyte 16 is a 1% to 25% saline solution, in particular a nitrate or chloride solution.
  • the pH of the electrolyte is adjusted between 6 and 11.
  • the workpiece 10 and the electrodes 12, 14 are electrically conductively connected to a voltage source 18.
  • the shape of the electrodes 12, 14 in the areas facing the areas to be removed of the workpiece 10 correspond to the shape of the workpiece 10.
  • an electrically non-conductive passivation layer 20 is produced on the workpiece surface .
  • the production of the passivation layer 20 takes place immediately after the machining of the workpiece 10, so that the passivation layer 20 protects the already machined turbine blade during the processing of a neighboring blade against further, unwanted removal.
  • the passivation layer 20 usually has a thickness of between 1 ⁇ m and 15 ⁇ m and consists of an oxide layer of the metallic material of the workpiece 10 or of the engine blade.
  • the passivation layer 20 can then be removed again by, for example, an abrasive wet blasting process or a vibratory finishing process. Furthermore, it is clear that the method described can be used not only for the production of engine components but also for their repair, since here not to be processed, adjacent surfaces are reliably protected against unwanted electrochemical removal.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une couche de protection sur une pièce métallique à traiter au moyen d'un processus de traitement électrochimique. Une tension est appliquée entre au moins une électrode (12, 14) et au moins une partie de la pièce (10), ladite tension produisant une couche de passivation non électroconductrice (20) sur la surface de la pièce en fonction de la composition métallique de la ou des parties de la pièce (10), dans cette partie, au moyen d'un électrolyte (16). L'invention concerne également un composant d'une turbine à gaz ou d'un compresseur haute pression ou basse pression.
PCT/DE2008/001726 2007-10-29 2008-10-22 Procédé de fabrication d'une couche de protection Ceased WO2009056100A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007051542.3 2007-10-29
DE200710051542 DE102007051542A1 (de) 2007-10-29 2007-10-29 Verfahren zur Herstellung einer Schutzschicht

Publications (2)

Publication Number Publication Date
WO2009056100A2 true WO2009056100A2 (fr) 2009-05-07
WO2009056100A3 WO2009056100A3 (fr) 2009-07-23

Family

ID=40490277

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2008/001726 Ceased WO2009056100A2 (fr) 2007-10-29 2008-10-22 Procédé de fabrication d'une couche de protection

Country Status (2)

Country Link
DE (1) DE102007051542A1 (fr)
WO (1) WO2009056100A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010037077B4 (de) * 2010-08-19 2014-03-13 Voestalpine Stahl Gmbh Verfahren zum Konditionieren der Oberfläche gehärteter korrosionsgeschützter Bauteile aus Stahlblech

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616343A (en) * 1964-08-08 1971-10-26 Inoue K Electrochemical machining method
HUP0002857A3 (en) * 1998-04-06 2003-11-28 Koninkl Philips Electronics Nv Method of and arrangement for electrochemical machining

Also Published As

Publication number Publication date
DE102007051542A1 (de) 2009-04-30
WO2009056100A3 (fr) 2009-07-23

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