EP2237915A2 - Procédé d'enlèvement de matériau d'un élément et électrode - Google Patents

Procédé d'enlèvement de matériau d'un élément et électrode

Info

Publication number
EP2237915A2
EP2237915A2 EP08859567A EP08859567A EP2237915A2 EP 2237915 A2 EP2237915 A2 EP 2237915A2 EP 08859567 A EP08859567 A EP 08859567A EP 08859567 A EP08859567 A EP 08859567A EP 2237915 A2 EP2237915 A2 EP 2237915A2
Authority
EP
European Patent Office
Prior art keywords
electrode
component
electrolyte
channel
gap
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.)
Withdrawn
Application number
EP08859567A
Other languages
German (de)
English (en)
Inventor
Erwin Bayer
Martin Bussmann
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 EP2237915A2 publication Critical patent/EP2237915A2/fr
Withdrawn legal-status Critical Current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
    • 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
    • B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • B23H1/04—Electrodes specially adapted therefor or their manufacture
    • 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
    • B23H3/04—Electrodes specially adapted therefor or their manufacture
    • 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
    • B23H3/04—Electrodes specially adapted therefor or their manufacture
    • B23H3/06—Electrode material
    • 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
    • B23H5/00—Combined machining
    • B23H5/10—Electrodes specially adapted therefor or their manufacture
    • 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
    • B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode

Definitions

  • the invention relates to a method for removing material from a component according to the preamble of patent claim 1. This process is also called electrochemical machining (ECM: Electro Chemical Machining or PECM: Precise Electro Chemical Machining).
  • ECM Electro Chemical Machining
  • PECM Precise Electro Chemical Machining
  • the component from which material is to be removed is switched as an A-node.
  • An electrode is guided to the component, namely a gap is formed between the electrode and the component.
  • the shape of the electrode is a counterpart to the shape the component is to receive.
  • the electrode is switched as a cathode, and between the cathode (electrode) and the anode (component) then an electrolyte must be introduced, ie in the gap.
  • the ablation takes place precisely at a predetermined surface area of the component and not in the surrounding areas.
  • the latter can be etched by the electrolyte, in particular if the electrolyte is located on the component beyond the actual effective area, and if stray currents flow.
  • Another problem is that the electrolyte is consumed during the process. The electrolyte must therefore be replaced. If this is not done uniformly, localized depositions of the material transferred to a hydroxide from the workpiece can occur. At such points, the conductivity of the electrolyte is then reduced, which can lead to a rise of the electrode on the component and thus to short circuit.
  • a channel is formed, which has a feed opening and a discharge opening, wherein the component with a part of its surface forms a wall and the electrode with at least part of its surface also forms a wall of the channel.
  • electrolyte is constantly conducted from the supply port to the discharge port.
  • the uniformity of the electrolyte flow can thereby be ensured particularly reliably that the electrolyte is introduced under a pressure of 2 to 50 bar into the feed opening of the channel, whereby preferably a suitable nozzle is used for this purpose.
  • the formation of the channel can take place in a particularly simple manner by providing two guide elements which bridge the gap (in particular non-conductive). Although these can be attached to the component or even attach by hand, it has proven to be particularly easy practical, if the guide elements are arranged or attached to the electrode (ie part of the electrode unit). Then, in a process of moving the electrode toward the component, the guide elements contact the component to form the gap, the surface of the component, so that the channel is also formed directly with the formation of the gap in its final size.
  • a channel is more or less automatically provided by the shape of the component at the electrode. This is the case, in particular, when the component is provided with a recess, and when an electrode designed as a sinking electrode is used, which engages precisely in the component. Then just by the formation of the gap at the same time the channel is formed.
  • the recess is to be increased in depth by the removal process, not necessarily in their lateral dimensions. Therefore, it is useful to coat the electrode partially with an insulating body, so that only in a portion of the channel, an electrical connection of the electrode is made possible with the component via the E lektrolyten.
  • a preferred case where the method is applicable is the manufacture of engine components from nickel or titanium based alloys.
  • the engine component here is the component resulting from the original component by machining.
  • a typical such engine component is a blade profile.
  • Fig. 1 shows schematically the inventive method in a first embodiment and Fig. 2 schematically illustrates the inventive method in a second embodiment.
  • Material is to be removed from a component denoted by 10 by electrochemical machining (so-called "sinking") .This is done by connecting the component 10 as anode 12. An electrode 12 is then switched as a cathode and moved in accordance with the arrow 14 in the direction of the component 10 but, so that the surfaces of the device 10 and the electrode 12 do not contact each other so as not to cause a short circuit, a gap 16 is provided between the device 10 and the electrode 12, as shown in FIG. This gap 16 is now delimited on two sides by a guide element 18.
  • the guide element 18 is fastened to the electrode 12, namely, it is nonconductive and elastic
  • the two guide elements 18 reach the surface of the component 10, so that a channel is formed, so that a lower wall of the channel is through the component 10, an upper wall of the channel through the electrolyte 12, and the side walls of the channel through the guide elements 18.
  • the channel has a feed opening 20 shown in FIG. 1 at the bottom and a discharge opening 22 shown at the top in FIG Channel is now introduced electrolyte.
  • the electrolyte is forced through a nozzle 24 at high pressure of at least 2 and up to 50 bar in the channel via the Zufarffhung 20.
  • the discharge opening 22 is, in particular by suitable shaping of the electrode 22, formed so that the electrolyte exits the channel in a free jet 26 and is directed away from the component 10.
  • a component 10 ' which has recesses 28.
  • the recess 28 in the depth (ie in Fig. 2 upward) to be increased.
  • Suitable for the recesses 28 are E- electrodes 12 'are formed. These engage in the recesses, in such a way that they touch neither side nor at the end of the recess 28, the component 10 '.
  • Nozzles 24 now spray an electrolyte into the channel at a pressure of 2 to 50 bar (feed opening 20 '), and the electrolyte leaves the channel 30 via a discharge opening 22' in each case. So that the electrodes act only in the direction of the depth of the recess 28, they are each laterally coated with an insulating body 32.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

L'invention concerne un procédé d'enlèvement de matériau d'un élément (10,10') faisant fonction d'anode, auquel est reliée une électrode (12) en tant que cathode, de manière à former un interstice (16) dans lequel est introduit un électrolyte, la formation d'un canal permettant de créer un circuit fermé pour l'électrolyte. Cet électrolyte circule en permanence entre une ouverture d'entrée et une ouverture de sortie du canal. La formation du canal, par exemple par des éléments de guidage (18) fixés sur l'électrode (12), garantit que seules les parties de la surface de l'élément (10) à usiner dont du matériau doit être enlevé entrent en contact avec l'électrolyte sans que l'électrolyte ne touche les autres parties de la surface de l'élément. La circulation permanente de l'électrolyte sur ces surfaces permet d'évacuer en permanence de l'électrolyte usagé avec des résidus et d'amener de l'électrolyte pur, le procédé étant ainsi réalisé rapidement et sans dysfonctionnement.
EP08859567A 2007-12-13 2008-12-05 Procédé d'enlèvement de matériau d'un élément et électrode Withdrawn EP2237915A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007060070A DE102007060070A1 (de) 2007-12-13 2007-12-13 Verfahren zum Abtragen von Material von einem Bauteil und Elektrode
PCT/DE2008/002040 WO2009074141A2 (fr) 2007-12-13 2008-12-05 Procédé d'enlèvement de matériau d'un élément et électrode

Publications (1)

Publication Number Publication Date
EP2237915A2 true EP2237915A2 (fr) 2010-10-13

Family

ID=40679907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08859567A Withdrawn EP2237915A2 (fr) 2007-12-13 2008-12-05 Procédé d'enlèvement de matériau d'un élément et électrode

Country Status (5)

Country Link
US (1) US9254530B2 (fr)
EP (1) EP2237915A2 (fr)
CA (1) CA2709195A1 (fr)
DE (1) DE102007060070A1 (fr)
WO (1) WO2009074141A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009040862A1 (de) * 2009-09-09 2011-03-10 Mtu Aero Engines Gmbh Verfahren und Vorrichtung zum lokalen Entfernen wenigstens einer metallischen Schicht von einem aus einer Legierung gefertigten Bauteil
US9976227B2 (en) 2014-05-15 2018-05-22 Baker Hughes, A Ge Company, Llc Electrochemical machining method for rotors or stators for moineau pumps

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1050139A (fr) 1900-01-01
NL131373C (fr) * 1959-11-16 1900-01-01
US3196093A (en) * 1960-06-13 1965-07-20 Anocut Eng Co Electrolytic cavity sinking apparatus and method for non-parallel workpiece surfaces
DE1931174B2 (de) * 1969-06-19 1975-09-04 Siemens Ag, 1000 Berlin Und 8000 Muenchen Einrichtung zum elektrolytischen Durchlaufpolieren von stabförmigen Werkstücken aus Zirkortlegierungen
US4256555A (en) * 1978-05-30 1981-03-17 Rolls Royce Limited Electro-chemical-machining of aerofoil blades
US4174268A (en) * 1978-09-01 1979-11-13 Trw Inc. Electrode guide
DE3126033A1 (de) 1981-07-02 1983-01-20 Bayerische Motoren Werke AG, 8000 München Elektrolytdruckkammer fuer eine einrichtung zum elektrochemischen bearbeiten von werkstuecken, insbesondere zum elektrochemischen senken
US4772372A (en) * 1987-05-13 1988-09-20 General Electric Company Electrodes for electrochemically machining airfoil blades
GB2300584B (en) * 1995-05-11 1998-09-02 Rolls Royce Plc Improvements in or relating to electrochemical machining of aerofoil blades
DE102004040216B3 (de) * 2004-08-19 2005-12-08 Mtu Aero Engines Gmbh Elektrode und Verfahren zur elektrochemischen Bearbeitung eines Werkstücks
US7964087B2 (en) * 2007-03-22 2011-06-21 General Electric Company Methods and systems for forming cooling holes having circular inlets and non-circular outlets

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2009074141A2 *

Also Published As

Publication number Publication date
US9254530B2 (en) 2016-02-09
US20100270168A1 (en) 2010-10-28
WO2009074141A2 (fr) 2009-06-18
DE102007060070A1 (de) 2009-06-18
CA2709195A1 (fr) 2009-06-18
WO2009074141A3 (fr) 2010-09-23

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