EP3787826A1 - Verfahren zur herstellung einer scheibe einer strömungsmaschine - Google Patents
Verfahren zur herstellung einer scheibe einer strömungsmaschineInfo
- Publication number
- EP3787826A1 EP3787826A1 EP19727929.2A EP19727929A EP3787826A1 EP 3787826 A1 EP3787826 A1 EP 3787826A1 EP 19727929 A EP19727929 A EP 19727929A EP 3787826 A1 EP3787826 A1 EP 3787826A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- disc
- receiving grooves
- stage
- receiving
- disk
- 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.)
- Pending
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
- 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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/10—Manufacture by removing material
- F05D2230/11—Manufacture by removing material by electrochemical methods
Definitions
- the present invention relates to a method for producing a disk, in particular a turbine disk for a turbomachine, such as for a stationary gas turbine or an aircraft engine.
- blades which interact with the gas flowing through, are often arranged in receiving grooves of disks or turbine disks, wherein blade roots of corresponding blades are provided for arrangement in the receiving grooves of the disk.
- the receiving grooves and the blade root of the blades have complementary shapes to each other.
- the receiving grooves and the blade root can have complex contours for the secure fastening of the blade root in the receiving grooves and the load transfer from the blades to the discs, so that the production of both the grooves on the discs and the manufacture of the blade root on the blades must meet certain requirements, in particular because an exact shape is also important for the avoidance of voltage peaks during operation of importance.
- machining processes such as broaching, for example, are usually used to produce receiving grooves for blade roots in turbine disks.
- the corresponding cutting tools such as broaches and cutters are subject to high wear, since the discs are usually formed of high-temperature forgings, such as nickel-based materials.
- an efficient production of a corresponding disk while simultaneously avoiding deviations in shape is made possible.
- should be possible with the appropriate manufacturing process as accurate as possible shaping of the disc with a precise arrangement of the grooves while avoiding deformation of the disc or a delay of the disc.
- rectilinear grooves, as they are also used in the machining of can be produced more efficiently than can be produced in the prior art.
- the present invention it is proposed for the production of rectilinear receiving grooves in a disc of a turbomachine to introduce a plurality of receiving grooves into the disc at the same time, in opposite regions which face one another relative to a central axis of rotation of the disc.
- the receiving grooves to be introduced at the same time are arranged uniformly distributed around the circular circumference of the disc.
- the distribution of the receiving grooves in the disk, which are introduced at the same time can be selected such that a distortion of the disk due to residual stresses can be minimized.
- a rectilinear receiving groove is understood to mean a receiving groove which extends along a straight line from one end face of the disk to the other end face of the disk.
- a straight line can be drawn from each point of the cross section of the receiving groove on one of the front sides to the corresponding point of the cross section on the other end side, which delimits the receiving groove accordingly.
- the receiving grooves can advantageously be introduced into the pane by electrochemical material processing, in particular at least partially by electrochemical material processing. Due to the at least partially electrochemical material processing tool wear can be avoided or significantly reduced, so that thereby the efficiency of the production is further increased.
- the electrochemical material processing has the advantage that the simultaneous introduction of several grooves in the disk is easy to implement.
- the receiving grooves can in particular be introduced into the disk by at least two-stage machining, wherein in particular the first stage of machining can be effected by electrochemical material processing and / or at least several, preferably all, receiving grooves in the disk are produced at least in the first stage of machining.
- the advantage of a two-stage introduction of the receiving grooves into the disc is that in the first stage of processing, the receiving grooves can first be introduced in a raw form, so that the contour of the receiving grooves can have a corresponding allowance of, for example, 0.1 to 1 mm , Only in the second stage of processing can then be a fine machining with an exact setting of the desired shape and / or dimensions of the grooves, wherein in the second stage of processing and the processing of the grooves can be performed individually one after the other.
- the second or a further stage of the machining can be effected by machining or by machining or by electrochemical material processing.
- electrochemical material processing in particular in this stage of the machining, can be carried out with an electrode which has a wedge-shaped effective area at the electrode tip, so that the electrode adjoins its electrode Electrode tip has a wedge shape with a taper in the direction of feed.
- Electrode can be achieved a very precise shape at high processing speed, when the electrode is introduced with its electrode tip, for example, in an already preformed Aufhauptut and moved at a relatively high feed rate linearly through the receiving groove.
- the advancing speed of the electrode in the first stage electrochemical machining may be in the range of 0.5 to 5 mm / min, while in the fine machining, the machining speed may be in the range of 50 mm / min.
- each or each receiving groove can be edited differently.
- certain areas of the groove walls can be processed differently.
- a part of the groove walls can be processed only by means of a machining in the first processing stage, while the other part of the groove walls, in particular load-removing groove walls in the second or a further processing stage of a fine machining can be subjected.
- FIG. 1 shows a side view of a turbine disk produced according to the invention
- FIG. 2 shows a plan view of an end face of the turbine disk from FIG. 1,
- FIG. 3 shows a perspective view of an electrode for forming the receiving grooves in the turbine disk from FIGS. 1 and 2 and in FIG.
- FIG. 4 is an enlarged view of the electrode tip of the electrode from FIG. 3.
- FIG. 1 shows a turbine disk 1, as can be produced according to the present invention.
- the turbine disk 1 has an end face 2 and an opposite end side 3, which are each surrounded by a cylindrical jacket surface 4 or connected to one another.
- the receiving grooves 5 each have an enlarged receiving space below the slot opening on the lateral surface 5, as can be seen clearly in FIG. 2 and shown in FIG. 1 with the dashed lines.
- the receiving grooves 5 are arranged with their longitudinal axes relative to the axis of rotation 6 of the turbine blade 1, which extends perpendicularly through the end faces 2, 3, inclined by the angle a.
- the receiving grooves 5 are evenly distributed along the circular circumference of the turbine disk 1 on the lateral surface 4 are arranged.
- the course of the grooves 5 along the lateral surface 4 is not shown in the figure for the sake of simplicity.
- the cross-section of the receiving grooves 5 is hammer-shaped in the embodiment shown in Figures 1 and 2, so that in addition to an opening into the groove opening on the lateral surface 4 narrow channel which is bounded by the groove walls 7 and 13, a larger-sized, essentially rectangular receiving area for the blade root is formed below the slot opening, which is bounded by the groove walls 8,9,10,11 and 12.
- the shape of the receiving grooves 5 is only an example to illustrate the invention. Of course, many different, other suitable forms of receiving grooves 5 in turbine disks 1 can be realized.
- the receiving grooves 5 extend rectilinearly along their longitudinal axis, so that the groove walls 7, 8, 9, 10, 11, 12 and 13, which extend transversely to the image plane according to FIG. 2, form planar surfaces and the edges, which bound each two groove walls straight lines are. Due to the arrangement of the receiving grooves 5, which is inclined with respect to the axis of rotation 6 of the turbine disk 1, the groove walls also extend at least partially obliquely to the image plane.
- all of the receiving grooves 5 can be introduced into the turbine blade 1 at the same time, so that by introducing the receiving grooves 5 into the material of the turbine disk 1 no unacceptable deformation of the turbine disk 1 is generated by asymmetrically occurring residual stresses. Even if by introducing the images 5 or by the corresponding Materialentfemung residual stresses in the turbine disk 1 are free, it comes through the simultaneous introduction of all grooves 5 to a rotationally symmetric occurrence of residual stresses and distortion of the turbine disk 1 and a displacement of the arrangement of the grooves 5 can be reliably avoided or at least be reduced.
- receiving grooves 5 are to be introduced at the same time, it is possible to proceed in such a way that several mutually opposite receiving grooves 5 are introduced at the same time, so that machining of the turbine disk 1 arranged as point-symmetrically as possible with respect to the axis of rotation 6 of the turbine disk 1 advantageously results ,
- two receiving grooves 5 arranged along a bisector 15 of the turbine disk 1 can be introduced simultaneously into the turbine disk 1.
- the receiving grooves 5 lying in a circular sector 14 between two halves 15 can be introduced simultaneously with the corresponding receiving grooves 5 located in the opposite sector 16.
- each pair of the receiving grooves 5, which are introduced at the same time lie opposite each other with respect to the axis of rotation 6 of the turbine disk 1.
- all receiving grooves 5 are incorporated simultaneously into the turbine disk 1.
- the receiving grooves 5 are at least partially produced by electrochemical material processing.
- electrodes are used which correspond in their outer contour of the inner contour of the grooves 5.
- material of the turbine disk 1 corresponding to the shape of the electrode 16 can be removed from the turbine disk 1, so that in a continued electrochemical material processing with the electrode 16 and the propulsion of the electrode 16 in the direction of the longitudinal axis of the receiving groove 5 to be produced, the corresponding receiving groove. 5 be incorporated into the turbine disk 1.
- the electrode 16 may be wedge-shaped on the electrode tip 17, which is oriented in the direction of the material to be processed, so that the electrode tapers in the direction of the electrode tip 17. This is shown again in greater detail in FIG. FIG. 4 shows the electrode tip 17 and the oblique surfaces 17 of the electrode on the electrode tip 16, which effect the wedge shape of the electrode 16.
- the introduction of the receiving grooves 5 in the turbine disk 1 is preferably carried out in a two-stage process, wherein in the first stage of the process, the receiving grooves with a larger error tolerance, i. is introduced with respect to the desired receiving space reduced dimensions. Only after introducing a raw form of the grooves 5 in the turbine disk 1, the exact shape of the grooves 5 is generated within the predetermined tolerances in a subsequent second stage of machining. After the first stage of processing, the receiving grooves 5 may still have an allowance of 0.1 to 1 mm compared to the final contour.
- the first stage of processing can be carried out in the manner described above for several or all grooves simultaneously, while the fine machining can also be done individually for a receiving groove 5 after the other.
- Both the first stage of machining the turbine disk 1 to produce the receiving grooves 5 and the second stage of the machining can be carried out by electrochemical material processing.
- the second stage of machining takes place by means of cutting processes, for example by broaching or grinding or the like.
- the feed rate of the electrode in the first stage may be between 0.5 and 5 mm / min, while the processing speed in the second stage for the fine processing is greater than in the first Level and can be up to 50 mm / min.
- the receiving grooves 5 to be produced are processed differently in different areas.
- the groove walls 9 and 11 can only be processed in a single-stage process and these groove walls can be dispensed with finishing with the second processing stage, while the remaining groove walls 7,8,10,12 and 13 each with the two-stage process can be edited.
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)
- General Engineering & Computer Science (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018206705.8A DE102018206705A1 (de) | 2018-05-02 | 2018-05-02 | Verfahren zur Herstellung einer Scheibe einer Strömungsmaschine |
PCT/DE2019/000120 WO2019210896A1 (de) | 2018-05-02 | 2019-05-02 | Verfahren zur herstellung einer scheibe einer strömungsmaschine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3787826A1 true EP3787826A1 (de) | 2021-03-10 |
Family
ID=66690180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19727929.2A Pending EP3787826A1 (de) | 2018-05-02 | 2019-05-02 | Verfahren zur herstellung einer scheibe einer strömungsmaschine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20220032384A1 (de) |
EP (1) | EP3787826A1 (de) |
DE (1) | DE102018206705A1 (de) |
WO (1) | WO2019210896A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019210905A1 (de) * | 2019-07-23 | 2021-01-28 | MTU Aero Engines AG | Verfahren und Vorrichtung zum Bearbeiten von Bauteilen durch elektrochemisches Abtragen |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3288699A (en) * | 1964-02-12 | 1966-11-29 | Ex Cell O Corp | Apparatus for electrochemical shaping |
DE19959593B4 (de) * | 1999-12-10 | 2007-02-22 | Rolls-Royce Deutschland Ltd & Co Kg | Verfahren zum Herstellen einer Bohrung durch Elysieren |
US6340424B1 (en) * | 2000-08-17 | 2002-01-22 | General Electrical Company | Manufacture of complexly shaped articles using an automated design technique |
DE10258920A1 (de) * | 2002-12-17 | 2004-07-01 | Rolls-Royce Deutschland Ltd & Co Kg | Verfahren und Vorrichtung zur Formgebung durch elektrochemisches Abtragen |
DE102006015442A1 (de) * | 2006-03-31 | 2007-10-04 | Daimlerchrysler Ag | Elektrode zur elektrochemischen Bearbeitung von elektrisch leitfähigem Material |
DE102007060071A1 (de) * | 2007-12-13 | 2009-06-25 | Mtu Aero Engines Gmbh | Verfahren zur Bearbeitung eines metallischen Bauteils |
DE102010032326A1 (de) * | 2010-07-27 | 2012-02-02 | Mtu Aero Engines Gmbh | Elektrode und Verfahren zum elektrochemischen Bearbeiten eines Bauteils |
FR3006925B1 (fr) * | 2013-06-17 | 2016-01-15 | Snecma | Procede de realisation d'alveoles d'un disque de turbomachine |
DE102014111542A1 (de) * | 2014-08-13 | 2016-02-18 | pEMTec SNC | Vorrichtung und Verfahren zur elektrochemischen Bearbeitung im Umriss rotationssymmetrischer Werkstücke |
FR3042138B1 (fr) * | 2015-10-07 | 2018-05-25 | Pemtec | Outillage pour l'usinage d'alveoles de disques multi-etages par pecm, ensemble et machine d'usinage electrochimique comportant cet outillage, et procede utilisant cet outillage |
-
2018
- 2018-05-02 DE DE102018206705.8A patent/DE102018206705A1/de active Pending
-
2019
- 2019-05-02 EP EP19727929.2A patent/EP3787826A1/de active Pending
- 2019-05-02 WO PCT/DE2019/000120 patent/WO2019210896A1/de unknown
- 2019-05-02 US US17/051,997 patent/US20220032384A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2019210896A1 (de) | 2019-11-07 |
DE102018206705A1 (de) | 2019-11-07 |
US20220032384A1 (en) | 2022-02-03 |
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