EP2103384B1 - Procédé de fabrication d'un rotor intégral (BLISK) à aubage soudé - Google Patents

Procédé de fabrication d'un rotor intégral (BLISK) à aubage soudé Download PDF

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Publication number
EP2103384B1
EP2103384B1 EP09154985.7A EP09154985A EP2103384B1 EP 2103384 B1 EP2103384 B1 EP 2103384B1 EP 09154985 A EP09154985 A EP 09154985A EP 2103384 B1 EP2103384 B1 EP 2103384B1
Authority
EP
European Patent Office
Prior art keywords
blisk
blade
abrasive
blisk drum
drum
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.)
Expired - Fee Related
Application number
EP09154985.7A
Other languages
German (de)
English (en)
Other versions
EP2103384A1 (fr
Inventor
Arno Secherling
Matthias Biertz
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.)
Rolls Royce Deutschland Ltd and Co KG
Original Assignee
Rolls Royce Deutschland Ltd and Co KG
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 Rolls Royce Deutschland Ltd and Co KG filed Critical Rolls Royce Deutschland Ltd and Co KG
Publication of EP2103384A1 publication Critical patent/EP2103384A1/fr
Application granted granted Critical
Publication of EP2103384B1 publication Critical patent/EP2103384B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/003—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor whereby the workpieces are mounted on a holder and are immersed in the abrasive material
    • 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
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/10—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work
    • B24B31/116—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure
    • 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
    • F01D5/34—Rotor-blade aggregates of unitary construction, e.g. formed of sheet laminae
    • 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
    • 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
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • 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
    • F05D2230/40—Heat treatment

Definitions

  • the invention relates to a method for producing a blisk drum, in which two or more prefabricated blisks are welded together and the blisk drum thus formed is subsequently subjected to a heat treatment and the blade surfaces are polished in the last processing step.
  • Gas turbine rotors and particularly the rotors of gas turbine engine compressors, are designed with a blading integrally formed on the annular outer periphery of a disk or ring for reliability, weight-saving, performance and durability.
  • Such components are referred to as blisks, which term is a shorthand of the English language term "blade integrated disk”.
  • the production of blisks is known to be carried out by welding, in particular friction welding, separately manufactured blades with the peripheral surface of the preferably forged disc or by emanating from the outer peripheral surface of the disc material removal by means of cutting and / or chemical processes for forming the blades of the full material.
  • a fine machining of the blades by smoothing for example, vibratory sliding according to WO 00/29171 in that the blisk is housed in a vibrating medium-filled vibrating container in which the blades are ground or polished due to a spiraling motion of the grinding medium caused by the vibration, and thereafter substantially satisfying the aerodynamic requirements during operation of the gas turbine Have roughness (Ra) on the blade surfaces. Subsequently If necessary, the blisk disk is subjected to an etching process.
  • the smoothing of the blades on a blisk drum is known to be controlled by robots controlled by a predetermined program and equipped with a polishing lance.
  • the polishing of the individual blades with polishing lances is time consuming and costly.
  • the accessibility to the blade surfaces is partially limited, so that the required aerodynamic efficiency can not be achieved.
  • the invention has for its object to provide a method for producing a welded blisk drum in such a way that the blisk blades meet both the roughness of the side surfaces as well as in terms of their leading and trailing edge and extending on the blade tip high aerodynamic requirements and the time and Cost is also low.
  • the basic idea of the invention is to immerse a welded and heat-treated blister drum as a whole in a pasty, flowable abrasive medium and the Bliskschaufeln by a generated between the blisk drum and the abrasive medium To grind relative movement exclusively on the pressure and the suction side, while blade edges are made in the production of the individual blisks with a certain excess according to the eroded at the blade edges on the action of the abrasive medium material, so that the blade edges are indeed treated with the abrasive medium, but ultimately have the aerodynamically most favorable form.
  • abrasive medium guide elements prevents the relative movement of the abrasive medium in the edge regions and the abrasive medium are primarily directed to the surfaces to be ground of the blades.
  • the relative movement between the abrasive media and the blisk blades is achieved by a vibratory movement of the container containing the blisk drum held therein and the abrasive media.
  • the blisk can also move in the grinding medium but translational or rotating. It is also conceivable a combination of the aforementioned movement variants, wherein both the blisk drum and the container receiving the abrasive medium can be moved.
  • the blisk drum can be arranged vertically or horizontally in the container receiving the abrasive medium. Before being introduced into the grinding medium, the open end faces of the blisk drum are closed.
  • an abrasive paste with abrasive carriers bonded into it is used as the grinding medium so as to increase the pressure build-up on the blade surfaces to be ground.
  • the surface of the blisk drum after the heat treatment is first treated with an etchant in order to reduce a surface roughness caused by the heat treatment.
  • an etchant By subsequent to the etching treatment ball solidification of the blade surfaces, the strength of the blades is increased and reduces the risk of stress corrosion cracking. As a result of shot peening, the roughness of the blade surfaces increases. In the subsequent polishing of the entire blisk drum in the abrasive medium, however, the roughness of the blade surfaces is reduced to a value that meets the highest aerodynamic requirements.
  • the annular disks are first produced with integrally molded or shaped blades, so-called blisks, in the respectively required dimensioning for the individual stages of the compressor of a gas turbine and then welded into a multi-stage blisk drum.
  • the roughness of the blade surfaces at this time is at a roughness value (Ra) of about 0.25.
  • the blisk drum is subjected to a heat treatment to eliminate the stresses caused by the welding process.
  • a subsequent chemical treatment in an etching medium by ablating a brittle surface layer formed as a result of the heat treatment, the surface roughness is reduced to a roughness value Ra of increased by about 0.4.
  • the blades of the blisk drum are shot-peened in a special process in which the shape of the leading and trailing edges of the blade and the blade tip edge is not affected in order to increase the strength of the blades by introducing compressive residual stresses in the mutual surface layers Minimize the risk of cracking and thus increase the life of the blades.
  • a multiplicity of extremely small dome-shaped recesses are formed in the blade surfaces, so that the roughness value of the blade surface increases to a roughness value Ra of approximately 0.7.
  • the shot peening process is followed by a vibratory grinding treatment of all blades of the blisk drum, as a result of which the blade surfaces have an aerodynamically advantageous roughness value of Ra ⁇ 0.25 and the shape of the blade edges also satisfies the aerodynamic requirements imposed on them.
  • the aforementioned vibratory grinding of the blade surfaces is carried out in a filled with a pasty, flowable abrasive medium, sized according to the shape and size of the blisk drum abrasive container by a relative movement between the abrasive medium and the blade surfaces.
  • the blisk drum which is closed at the front, completely dips into the grinding medium.
  • the relative movement between the abrasive medium and the blade surfaces may be effected by vibration of the abrasive container and the blisk drum mounted thereon, for example, perpendicularly, the abrasive medium performing a torodial motion due to vibration of the abrasive container.
  • the blisk drum is translationally moved in the abrasive or is rotated about its axis.
  • the movement of the blade surfaces relative to the abrasive medium can also be achieved by a rotary movement of a horizontally mounted in the abrasive container blisk drum.
  • the abrasive medium consists of abrasive carriers embedded in a grinding paste, the combination of compact abrasive carriers and actual abrasive providing the necessary pressure build-up on the grinding surfaces and optimum grinding action.
  • the grinding medium can be specifically directed to the blade surfaces to be machined in order to achieve the desired grinding effect there, while the relative movement between the blade parts not to be treated, namely the blade edges, and the grinding medium is prevented not to change the original shape of the blade edges.
  • undesired material removal at the blade edges / blade tips can also be prevented by covering them.
  • the blade tips of the blades of the blisk remain thereby straight and sharp-edged, while maintaining a predetermined, preferred oval profile of the blade leading edges.
  • the grinding process can also be carried out without covering the blade edges or suppressing the relative movement at the blade edges, if already during the production of the individual blisks in the area in question, for example the leading edge of the blade, a certain amount of excess material that is involved with the Grinding abraded amount of material is identical, "held", that is, the blades during manufacture in knowledge of the unwanted during grinding material removal be dimensioned larger in the appropriate places.
  • a blisk drum which meets the highest aerodynamic requirements in terms of the blade edge geometry and the roughness of the blade surfaces and which can also be produced with reduced time and cost.
  • welded blisk drums can be produced, the blades of which have high strength and resistance to stress corrosion cracking, aerodynamically shaped leading and trailing edges and a sharp edged blade tip edge to ensure the required gap attitude and finally over blade side surfaces with an aerodynamically advantageous low roughness in the present embodiment is Ra ⁇ 0.25 have.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (6)

  1. Procédé pour fabriquer un tambour BLISK, dans lequel deux ou plusieurs disques BLISK sont soudés les uns aux autres ou assemblés d'une autre manière, et le tambour BLISK ainsi formé est ensuite soumis à un traitement thermique et les surfaces des aubes sont polies dans la dernière étape d'usinage, caractérisé en ce que le tambour BLISK dans son intégralité est poli dans un agent abrasif fluide, pâteux, au moyen d'un mouvement relatif généré entre le tambour BLISK et l'agent abrasif par vibration et/ou translation et/ou rotation du tambour BLISK ou d'un récipient contenant l'agent abrasif, sachant que dans les zones d'aube avec enlèvement indésirable de matière lors de la fabrication des disques BLISK, les aubes sont surdimensionnées en fonction de l'enlèvement de matière attendu lors du polissage.
  2. Procédé selon la revendication n° 1, caractérisé en ce que sur les bords d'aube est prévue une certaine quantité de matière excédant la forme finale et qui sera enlevée pendant l'opération de polissage ou par un autre procédé.
  3. Procédé selon la revendication n° 1 ou n° 2, caractérisé en ce que les faces frontales ouvertes du tambour BLISK sont fermées avant l'immersion dans l'agent abrasif.
  4. Procédé selon une des revendications n° 1 à n° 3, caractérisé en ce que l'agent abrasif est une pâte abrasive avec en elle des supports de produits abrasifs insérés afin de produire une mise sous pression dans les surfaces de polissage.
  5. Procédé selon une des revendications n° 1 à n° 4, caractérisé en ce que la surface du tambour BLISK est traitée avec un agent caustique après le traitement thermique.
  6. Procédé selon la revendication n° 5, caractérisé en ce qu'après le décapage, les aubes du tambour BLISK sont consolidées par grenaillage ou soumises à un autre procédé de consolidation de surface.
EP09154985.7A 2008-03-18 2009-03-12 Procédé de fabrication d'un rotor intégral (BLISK) à aubage soudé Expired - Fee Related EP2103384B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810014725 DE102008014725A1 (de) 2008-03-18 2008-03-18 Verfahren zur Herstellung einer geschweißten Blisktrommel

Publications (2)

Publication Number Publication Date
EP2103384A1 EP2103384A1 (fr) 2009-09-23
EP2103384B1 true EP2103384B1 (fr) 2013-11-20

Family

ID=40679512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09154985.7A Expired - Fee Related EP2103384B1 (fr) 2008-03-18 2009-03-12 Procédé de fabrication d'un rotor intégral (BLISK) à aubage soudé

Country Status (2)

Country Link
EP (1) EP2103384B1 (fr)
DE (1) DE102008014725A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009021824A1 (de) * 2009-05-18 2010-11-25 Rolls-Royce Deutschland Ltd & Co Kg Verfahren zum Kantenentgraten und -verrunden
DE102013107493A1 (de) * 2013-07-15 2015-01-15 Rolls-Royce Deutschland Ltd & Co Kg Verfahren zur Bearbeitung einer im Wesentlichen rotationssymmetrischen und um eine Achse drehbar gelagerten Rotorvorrichtung
DE102015209745B4 (de) 2015-05-28 2018-12-20 MTU Aero Engines AG Verfahren zur Herstellung einer Tl-Blisk

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4447992A (en) * 1981-09-18 1984-05-15 United Technologies Corporation Shuttle for a tumbling operation
US5341602A (en) * 1993-04-14 1994-08-30 Williams International Corporation Apparatus for improved slurry polishing
DE59904234D1 (de) * 1998-09-21 2003-03-13 Siemens Ag Verfahren zur innenbearbeitung eines hohlen bauteils
DE59901771D1 (de) 1998-11-14 2002-07-18 Mtu Aero Engines Gmbh Anordnung zur feinbearbeitung von rotationssymmetrischen bauteilen
FR2814099B1 (fr) * 2000-09-21 2002-12-20 Snecma Moteurs Grenaillage transversal par ultrassons des aubes sur un rotor
US6780089B2 (en) * 2002-12-03 2004-08-24 General Electric Company Method and apparatus for removing a predetermined amount of material from a bottom portion of a dovetail slot in gas turbine engine disk
DE10309456A1 (de) * 2003-03-05 2004-09-16 Mtu Aero Engines Gmbh Vorrichtung und Verfahren zur Oberflächenbearbeitung eines Werkstückes
DE102005024733A1 (de) * 2005-05-31 2006-12-07 Mtu Aero Engines Gmbh Verfahren zum Oberflächenstrahlen von integral beschaufelten Rotoren

Also Published As

Publication number Publication date
EP2103384A1 (fr) 2009-09-23
DE102008014725A1 (de) 2009-09-24

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