WO2016023865A1 - Dispositif et procédé d'usinage électrochimique dans le contour de pièces à symétrie de rotation - Google Patents

Dispositif et procédé d'usinage électrochimique dans le contour de pièces à symétrie de rotation Download PDF

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Publication number
WO2016023865A1
WO2016023865A1 PCT/EP2015/068378 EP2015068378W WO2016023865A1 WO 2016023865 A1 WO2016023865 A1 WO 2016023865A1 EP 2015068378 W EP2015068378 W EP 2015068378W WO 2016023865 A1 WO2016023865 A1 WO 2016023865A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
workpiece
rotation
axis
preform
Prior art date
Application number
PCT/EP2015/068378
Other languages
German (de)
English (en)
Inventor
Igor Agafonov
Maarten Brussee
Alain FUNFROCK
Andreas Grützmacher
Juri Kraft
Rafail MUKHUTDINOV
Original Assignee
pEMTec SNC
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 pEMTec SNC filed Critical pEMTec SNC
Publication of WO2016023865A1 publication Critical patent/WO2016023865A1/fr

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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
    • B23H3/04—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
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/10—Working turbine blades or nozzles
    • 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
    • B23H2400/00—Moving mechanisms for tool electrodes
    • B23H2400/10—Moving mechanisms for tool electrodes for rotating the electrode

Definitions

  • the invention relates to a device for electrochemical machining in the outline of rotationally symmetrical workpieces and to a corresponding machining method.
  • the invention has for its object to provide a new device of the type mentioned and a corresponding method that allows compared to the prior art faster processing in the outline of rotationally symmetrical workpieces.
  • the device according to the invention that achieves this object is characterized by a first electrode which can be advanced relative to the workpiece in order to produce a preform, open toward the circumference of the workpiece, of a recess in the direction of the axis of rotation of the workpiece, and a second electrode which forms the recess in its final dimensions from the preform generated by the first electrode is rotatable about the axis of rotation relative to the workpiece.
  • the inventive use of different processing electrodes for the formation of a preform and for the finishing can be compared to the use of only one electrode to achieve a substantial reduction in processing time, both the formation of the preform and the finishing take less processing time.
  • the first electrode may be formed as a thin disk electrode, while the second electrode optionally extends in the axial direction over the entire recessed area.
  • the thin electrode can be moved at a high feed rate with little material removal in the side gap.
  • the preform can therefore advantageously be largely approximated to the final dimensions of the recess to be formed, which additionally shortens the processing step by the second electrode.
  • the advancing movement of the first electrode in the direction of the axis of rotation is superimposed by a rotational movement of the first electrode relative to the workpiece, which makes it possible to produce groove-shaped preforms inclined to the rotation axis. It is understood that the feed or rotational feed movements of the electrodes can be superimposed at least partially on oscillatory movements which enable a more precise machining in accordance with the PECM method.
  • the second electrode is dimensioned such that it can just be pushed into the preform, possibly with rotation about the axis of rotation.
  • the electrodes may be ring electrodes for simultaneously producing a plurality of recesses distributed over the circumference of the workpiece.
  • the recess may be e.g. to act in parallel or inclined to the axis of rotation groove, which preferably ends open on at least one end face of the workpiece.
  • the first recess may be e.g. to act in parallel or inclined to the axis of rotation groove, which preferably ends open on at least one end face of the workpiece.
  • Electrode connected to the second electrode to form a structural unit, which significantly facilitates the handling of the electrodes, in particular their sequential use. It is self-evident that the electrodes are arranged coaxially with one another within the structural unit and are preferably arranged at a distance corresponding to one another in the axial extent of the workpiece. Advantageously, in the latter case, the processing is completed by the first electrode before the second electrode engages in the formed preforms.
  • FIG. 1 shows a workpiece manufactured according to the invention in a plan view showing a section of the workpiece and in a side view
  • FIG. 2 shows a first electrode used to produce the workpiece of FIG. 1, FIG.
  • FIG. 3 shows a second electrode used for producing the workpiece of FIG. 1, FIG.
  • FIG. 4 shows the processing of the workpiece of FIG. 1 with the electrodes of FIG.
  • FIGS. 2 and 3 are explanatory views
  • Fig. 5 is a detail of the finishing of the workpiece of Fig. 1 by the electrode of Fig. 3 illustration.
  • a workpiece 1 to be produced by electrochemical machining is formed in its outlines as a disk-shaped rotary body with a rotation axis 2.
  • recesses 4 distributed over the circumference of the workpiece 1 are recesses 4 in the form of undercut grooves, which are open both to the rotation axis 2 parallel peripheral surface 3 and to the opposite disc surfaces of the workpiece 1 out.
  • the groove-shaped recesses 4 are inclined relative to the axis of rotation 2.
  • the undercut recesses 4 e.g. radially projecting from the workpiece 1 wings, in particular turbine wheel, are positively secured.
  • the workpiece 1 may consist of a very strong material which is difficult to remove mechanically but for which electrochemical processes are offered.
  • the electrochemical machining of the workpiece 1 is used in an electrode shown in Fig. 2 partial 5, which is formed in the embodiment shown as a thin annular disc.
  • the inner radius of the electrode 5 corresponds to the Outer radius of the workpiece 1.
  • the cross-sectional dimensions of the electrode projections 6 are below the overall dimensions of the recesses 4 to be achieved by the electrochemical machining, so Electrode forms only preforms of the recesses 4.
  • a second electrode 7 which like the first Elek- trade 5 is formed as a ring electrode with an outer radius of the workpiece 1 corresponding inner radius. Unlike the electrode 5, however, this is not an annular disk which is substantially thinner than the workpiece 1, but has at least one thickness corresponding to the workpiece 1. From the inside radially projecting, over the entire disk thickness extending electrode projections 8 are inclined according to the course of the recesses 4 to the ring axis. The cross-sectional dimensions of the second electrode 7 are below the final dimensions of the recesses 4 to be achieved by the electrochemical machining of the workpiece 1. In a device for electrochemical machining of the workpiece 1, the two electrodes 5, 7 according to FIG.
  • the electrode unit 10 is moved in a direction coaxial with the workpiece 1 parallel to the axis of rotation 2 of the workpiece 1 relative to the workpiece 1 according to arrow 11. Furthermore, a relative movement of the electrode unit 10 to the workpiece 1 takes place about the axis of rotation 2 according to arrow 1 2.
  • the advancing movement can be superimposed in the direction of arrow 1 1 as well as in the direction of rotation according to arrow 1 2 a vibration or torsional vibration, ie a processing not only after the ECM but PECM method. Due to the small thickness of the electrode 5, the removal of material in the side gap is limited so that the cross section of the preform 1 3 generated does not significantly exceed the corresponding cross section of the electrode projections 6. At constant feed rates in Directions of the arrows 1 1, 12 results in a preform 13, which is slightly curved according to a helix.
  • the second electrode 7, which is now used in the second step, has correspondingly curved electrode projections 8.
  • the electrode projections 8 are dimensioned so that they can be lowered in a feed movement of the electrode 7 according to the arrows 1 1, 12 in the preforms 13 of the workpiece 1. After sinking the electrode 7 in the through the disc-shaped workpiece 1 of axially continuous preforms 13 is carried out their finishing, wherein the electrode 7 performs only rotational feed movements according to arrow 12.
  • Side surfaces 14 and 15 of the electrode projections 8 of the electrode 7 correspond approximately to the shape of the achievable by the electrochemical machining inner surfaces of the recesses 4, so that by advancing the electrode 7 in both directions of rotation as indicated by arrow 12, a finishing of the preforms 13 until reaching the cross-sectional dimensions and -form of the recesses 4 can take place.
  • the finishing is preferably carried out according to the PECM method, that is to say with a torsional vibration of the workpiece 1 or / and of the electrode assembly 10 superimposed on the rotary feed.
  • the electrode 7 is divided by an insulating layer, such that in a processing cycle only the side of the electrode facing the narrow gap is subjected to stress, which is provided for removal from the material.
  • the electrode 7 could also be circular in accordance with coordinates X and Y, which are perpendicular to each other and to the direction of the arrow 1 1, are moved. It is understood that different control programs for finishing the workpiece and possibly surface smoothing by the electrode 7 can be used.

Landscapes

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

Abstract

L'invention concerne un dispositif d'usinage électrochimique dans le contour de pièces (1) à symétrie de rotation. Selon l'invention, le dispositif comprend une première électrode (5) qui, pour produire une préforme (13) d'un évidement (4) ouverte en direction de la périphérie de la pièce (1), peut être avancée en direction de l'axe de rotation (2) de la pièce (1) par rapport à la pièce (1), et comprend une deuxième électrode (7) qui, pour la finition de la préforme (13) produite par la première électrode (5), peut être amenée en rotation autour de l'axe de rotation (2) par rapport à la pièce (1).
PCT/EP2015/068378 2014-08-13 2015-08-10 Dispositif et procédé d'usinage électrochimique dans le contour de pièces à symétrie de rotation WO2016023865A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014111542.2A DE102014111542A1 (de) 2014-08-13 2014-08-13 Vorrichtung und Verfahren zur elektrochemischen Bearbeitung im Umriss rotationssymmetrischer Werkstücke
DE102014111542.2 2014-08-13

Publications (1)

Publication Number Publication Date
WO2016023865A1 true WO2016023865A1 (fr) 2016-02-18

Family

ID=53900792

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/068378 WO2016023865A1 (fr) 2014-08-13 2015-08-10 Dispositif et procédé d'usinage électrochimique dans le contour de pièces à symétrie de rotation

Country Status (2)

Country Link
DE (1) DE102014111542A1 (fr)
WO (1) WO2016023865A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018206705A1 (de) * 2018-05-02 2019-11-07 MTU Aero Engines AG Verfahren zur Herstellung einer Scheibe einer Strömungsmaschine
DE102020214344A1 (de) 2020-11-16 2022-05-19 MTU Aero Engines AG Werkzeugkathode sowie Verfahren zum Herstellen einer Werkzeugkathode zum elektrochemischen Bearbeiten

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3288699A (en) * 1964-02-12 1966-11-29 Ex Cell O Corp Apparatus for electrochemical shaping
US3795604A (en) * 1972-04-19 1974-03-05 Gen Electric Electrolytic machining electrode
DE10258920A1 (de) * 2002-12-17 2004-07-01 Rolls-Royce Deutschland Ltd & Co Kg Verfahren und Vorrichtung zur Formgebung durch elektrochemisches Abtragen
EP2011597A2 (fr) * 2007-07-06 2009-01-07 Turbocam, Inc. Système et procédé pour la fourniture de l'usinage électrochimique d'une pièce
WO2014202862A1 (fr) * 2013-06-17 2014-12-24 Snecma Procede de realisation d'alveoles d'un disque de turbomachine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3288699A (en) * 1964-02-12 1966-11-29 Ex Cell O Corp Apparatus for electrochemical shaping
US3795604A (en) * 1972-04-19 1974-03-05 Gen Electric Electrolytic machining electrode
DE10258920A1 (de) * 2002-12-17 2004-07-01 Rolls-Royce Deutschland Ltd & Co Kg Verfahren und Vorrichtung zur Formgebung durch elektrochemisches Abtragen
EP2011597A2 (fr) * 2007-07-06 2009-01-07 Turbocam, Inc. Système et procédé pour la fourniture de l'usinage électrochimique d'une pièce
WO2014202862A1 (fr) * 2013-06-17 2014-12-24 Snecma Procede de realisation d'alveoles d'un disque de turbomachine

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