EP2061286A2 - Bobine à induction, procédé et dispositif de chauffage inductif de composants métalliques - Google Patents

Bobine à induction, procédé et dispositif de chauffage inductif de composants métalliques Download PDF

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Publication number
EP2061286A2
EP2061286A2 EP08169046A EP08169046A EP2061286A2 EP 2061286 A2 EP2061286 A2 EP 2061286A2 EP 08169046 A EP08169046 A EP 08169046A EP 08169046 A EP08169046 A EP 08169046A EP 2061286 A2 EP2061286 A2 EP 2061286A2
Authority
EP
European Patent Office
Prior art keywords
components
induction coil
component
heated
inductive
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
EP08169046A
Other languages
German (de)
English (en)
Other versions
EP2061286A3 (fr
Inventor
Joachim Bamberg
Alexander Gindorf
Herbert Hanrieder
Günter Zenzinger
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 EP2061286A2 publication Critical patent/EP2061286A2/fr
Publication of EP2061286A3 publication Critical patent/EP2061286A3/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/40—Establishing desired heat distribution, e.g. to heat particular parts of workpieces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements

Definitions

  • the present invention relates to an induction coil for use in a method for inductive heating of metallic components, in particular of components of a gas turbine, wherein the components each have one or more surrounding the respective component cross-sectional side surfaces.
  • the invention further relates to a method and a device for inductive heating of metallic components, in particular components of a gas turbine and a component produced by the method.
  • a press welding method for connecting blade parts of a gas turbine, wherein an airfoil section and at least one further blade part are provided.
  • corresponding connecting surfaces of these elements are positioned substantially flush with each other and then welded together by energizing an inductor with high-frequency current and by moving together touching their connecting surfaces.
  • the sufficiently large and homogeneous heating of the two welding partners for the quality of the joint is of crucial importance.
  • inductive high frequency pressure welding processes are from EP 1 112 141 B1 and the EP 1 140 417 B1 known.
  • these methods are used for repairing and producing an integrally bladed rotor for a turbomachine or generally for connecting blade parts of a gas turbine.
  • an inductor is used, which is arranged in the region of a blade leading edge and blade trailing edge at a greater distance to the joining surface than in the middle region of the blade.
  • An induction coil according to the invention for use in a method for inductive heating of metallic components, in particular of components of a gas turbine is meander-shaped and formed around the component or components that they over at least a portion of one or more of the respective component cross-section surrounding side surfaces of or to be heated components in the area to be heated or a plurality of surfaces to be heated extends.
  • the inventive three-dimensional extent of the induction coil allows - in contrast to the known from the prior art areal coils - the current flow is directed so that it acts over almost the entire area of the surfaces to be machined, such as connecting surfaces of the components and thus regardless of the cross section of the components uniform heating of the entire processing or joining zone is achieved.
  • the induction coil according to the invention allows a heat input in areas of varying width, also the machined component can be easily moved out, since the induction coil usually does not completely surround the component.
  • the three-dimensional configuration of the induction coil is adapted to the geometry of the component (s) to be processed. This in turn ensures uniform heating of the metallic components in a working region of the induction coil.
  • the three-dimensional configuration of the induction coil is designed such that the current profile is formed on the surface or the surfaces perpendicular to the course of mutually parallel regions of the induction coil on a top and bottom of the components. This also ensures a uniform heating of the entire surface to be machined or the surfaces to be joined together.
  • this has at least one cooling device.
  • the cooling device ensures that there is no melting or melting of the induction coil itself.
  • the method for inductive heating is an inductive low-frequency or high-frequency pressure welding method for connecting metallic components, in particular components of a gas turbine.
  • the frequencies used are selected from a range between 0.05 - 2.5 MHz.
  • the induction coil according to the invention ensures that the current flow acts on the connecting surfaces of the components to be connected and generates a uniform heating of the entire joining zone, regardless of the cross section of the components.
  • a method for the inductive heating of metallic components, in particular of components of a gas turbine, wherein the components each have one or more side surfaces surrounding the respective component cross-section comprises the following steps: a) providing one or more components to be heated; b) bringing at least one induction coil to the component or components or bringing the component or components to the at least one induction coil, wherein the induction coil is meander-shaped and shaped around the component (s) such that the induction coil extends over at least a portion of the side surface or the side surfaces of the component or components to be heated in the region of a surface to be heated or of a plurality of surfaces to be heated, and inserting the component or components to be heated into the induction coil; and c) inductive heating of the device or devices in a working region of the induction coil.
  • the method according to the invention ensures that the three-dimensional extent of the induction coil used results in uniform heating of the metallic components independently of their cross section. Especially in the case of large and / or almost square joining surfaces, the current flow and thus the heating of the joining surfaces is uniform, since the current flow is directed so that it covers almost the entire Area of the surfaces to be machined, such as connecting surfaces of the components can act.
  • the three-dimensional configuration of the induction coil is adapted to the geometry of the component (s). This in turn ensures uniform heating of the metallic components in a working region of the induction coil.
  • the three-dimensional configuration of the induction coil is designed such that the current profile is formed on the surface or surfaces perpendicular to the course of mutually parallel regions of the induction coil on a top and bottom of the components. This also ensures a uniform heating of the entire surface to be machined or the surfaces to be joined together.
  • the inductive heating according to method step c) is an inductive low-frequency or high-frequency pressure welding method for connecting metallic components, in particular components of a gas turbine.
  • the frequencies used in this case can be selected from a range between 0.05 - 2.5 MHz.
  • the inductive heating according to method step c) is an inductive soldering for connecting metallic components or is designed to eliminate internal stresses of metallic components.
  • the inventive method allows a variety of different applications in the field of inductive heating of metallic components.
  • a first component may be a blade or part of a blade of a rotor in a gas turbine and a second component may be a ring or a disk of the rotor or a blade root arranged on the circumference of the ring or the disk.
  • the components may also be parts of a blade of a rotor in a gas turbine.
  • An inventive device for inductive heating of metallic components, in particular of components of a gas turbine, wherein the components each have one or more surrounding the respective component cross-section side surfaces, has at least one generator and at least one induction coil, wherein the induction coil is meander-shaped and so to the or the components are shaped so that the induction coil extends over at least a portion of the side surface or the side surfaces of the component or components to be heated in the region of a surface to be heated or of a plurality of surfaces to be heated.
  • processing or heating of the components takes place by means of a meandering and a three-dimensional extension having induction coil.
  • the flow of current can be directed so that it acts over the entire surface of the surfaces or connecting surfaces to be machined and thus uniform heating of the entire processing surface or joining zone is achieved independently of the cross section of the components.
  • the current flow between two surfaces to be joined is reinforced.
  • the device according to the invention allows a heat input in areas of varying width, also the machined component can be easily moved out of the device, since the induction coil used does not usually completely surround the component.
  • the three-dimensional configuration of the induction coil is adapted to the geometry of the component (s). This adaptation ensures uniform heating of all surfaces to be machined in the working area of the induction coil.
  • the three-dimensional configuration of the induction coil is designed such that the current profile is formed on the surface or the surfaces perpendicular to the course of mutually parallel portions of the induction coil on a top and bottom of the components. This also ensures a uniform heating of the entire surface to be machined or the surfaces to be joined together.
  • the device has at least one cooling device for the induction coil.
  • the cooling device ensures that there is no damage to the induction coil, for example, by an excessive temperature entry into the induction coil.
  • the inductive heating is an inductive low-frequency or high-frequency pressure welding method for connecting metallic components, in particular of components of a gas turbine.
  • the frequencies used can be selected from a range between 0.05 - 2.5 MHz. Due to the uniform heat input regardless of the cross section of the components to be connected, the device according to the invention is particularly suitable for connecting corresponding metallic components.
  • the device may comprise means which allow a performance of the inductive low-pressure or high-frequency pressure welding in vacuum or a protective gas atmosphere. This contributes to the quality of the resulting welded joints.
  • an insulator is arranged between the induction coil and the component or components in the region of the components to be heated or connected, the insulator having at least one surface facing the component or components and a material which, due to its specific properties, does not substantially or not hinder the magnetic interaction between the induction coil and the components to be heated.
  • the surface of the insulator may be formed spaced from the induction coil and / or the one or more components.
  • the insulator may consist, for example, of glass, in particular high-temperature-resistant quartz glass, a high-temperature-resistant ceramic or a high-temperature-resistant plastic.
  • the induction coil is reliably isolated in a formation of metal vapor by the evaporation of the surfaces of the components to be heated, there is no plasma and thus no short circuit between the components and the induction coil.
  • the device can also in case of metal vapor formation trouble-free and continuously continue working, which is imperative, for example, in an automatic series production of components.
  • the magnetic interaction between the insulator and the components is not obstructed due to a suitable material selection of the insulator. A possible spacing of the surface of the insulator from the induction coil ensures that there is no stress between the induction coil and the insulator and / or the device and the insulator due to possible temperature-dependent differences in the thermal expansion between these elements.
  • the insulator layer-shaped or foil-shaped is preferably formed from
  • the geometry of the surface of the insulator facing the component or components is adapted to the geometry of the component (s) to be inserted. This ensures that there is no hindrance to the insertion of the component into the induction coil.
  • a component according to the invention is, for example, a so-called BLING or BLISK, which have been produced in particular using an inductive low-frequency or high-frequency pressure welding method.
  • FIG. 1 shows a schematic representation of an induction coil 100 according to the prior art. It can be seen the planar configuration of the induction coil 100 with the two components 12, 14 to be connected to the opposite joining surfaces 38, 40 by means of an inductive low-frequency or high-frequency pre-welding. Due to the planar design of the induction coil 100 but only a portion of the joining surfaces 38, 40, namely in particular an edge portion 42 of the induction coil 100 is closest, heated. It becomes clear that in particular in the middle of the joining surfaces 38, 40 no direct heating by means of the induction coil 100 takes place.
  • FIG. 2 shows a schematic representation of an induction coil 10 according to an embodiment of the invention.
  • the induction coil 10 is shown in unfolded state, you can clearly see the meandering configuration of the induction coil 10.
  • Other meandering forms, eg. B. with rounded corner areas are conceivable.
  • the induction coil 10 is usually made of copper or a copper alloy. Other metal or metal alloys can also be used.
  • FIG. 3 shows a schematic representation of the induction coil 10 according to FIG. 2 in a folded state.
  • the induction coil 10 can be used in a method for inductive heating of metallic components 12, 14, in particular of components of a gas turbine.
  • the components 12, 14 each have a plurality of side surfaces 20, 22, 24, 26 surrounding the respective component cross-section, the meander-shaped induction coil being shaped or folded around the components 12, 14 such that they extend over partial regions of the side surfaces 20, 22, 24 of the components 12, 14 in the region of joining surfaces 16, 18 of the components 12, 14 to be heated.
  • the three-dimensional design of the induction coil 10 of the geometry of the components 12, 14 is adjusted.
  • a current waveform on the joining surfaces 16, 18 is generated perpendicular to the course of parallel formed portions of the induction coil 10 at a top and bottom 20, 22 of the components 12, 14 is generated ,
  • the current flow is indicated by black arrows.
  • the result is a uniform current flow, which extends over the entire surface of the joining surfaces 16, 18 and thus allows uniform heating of the joining surfaces 16, 18 over their entire range.
  • FIGS. 4a and 4b show schematic representations of a device 28 for inductive heating of the metallic components 12, 14.
  • the device 28 includes a generator 30 and in the illustrated embodiment, an induction coil 10, which in turn is meander-shaped and is formed around the components 12, 14, that it extends over a partial region of the side surfaces of the components 12, 14 in the region of the surfaces or joining surfaces 16, 18 to be heated (see also FIG FIG. 3 ). It can be seen that the induction coil is connected to the generator 30 via two electrical connections 32, 34. A holding and feeding device 36 is used to bring the component 14 to the component 12, with a corresponding approach after a sufficient heating of the joining surfaces 16, 18 takes place.
  • the inductive heating takes place in the context of an inductive low-frequency or high-frequency pressure welding method for connecting the two metallic components 12, 14.
  • the frequencies used in inductive low-frequency or high-frequency pressure welding are selected from a range between 0.05 to 2.5 MHz ,
  • the device 28 is shown with only one component 14.
  • the meander-shaped, three-dimensional configuration of the induction coil 10 can be seen clearly.
  • the induction coil 10 is designed in such a way that the component 14 or both components 12, 14 can be easily inserted into the induction coil 10. In the case of components 12, 14 with a very large cross-section of the joining surfaces 16, 18, a lateral material discharge may occur. This can be achieved by conventional measures such. B. a Sputteriseren be eliminated.
  • joining surfaces 16, 18 can be shot peened. Furthermore, overheating of the base material of the components 12, 14 is avoided by an allowance in the induction coil area. In the manufacture or repair of blades of a gas turbine is advantageously almost no current flow in the edge region to determine, so that undesirable influences are avoided here.
  • the exemplary embodiment makes it clear that the device 28 is suitable both for the manufacture and the repair of components and components of a gas turbine.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
EP08169046.3A 2007-11-16 2008-11-13 Bobine à induction, procédé et dispositif de chauffage inductif de composants métalliques Ceased EP2061286A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007054782A DE102007054782A1 (de) 2007-11-16 2007-11-16 Induktionsspule, Verfahren und Vorrichtung zur induktiven Erwärmung von metallischen Bauelementen

Publications (2)

Publication Number Publication Date
EP2061286A2 true EP2061286A2 (fr) 2009-05-20
EP2061286A3 EP2061286A3 (fr) 2013-09-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08169046.3A Ceased EP2061286A3 (fr) 2007-11-16 2008-11-13 Bobine à induction, procédé et dispositif de chauffage inductif de composants métalliques

Country Status (4)

Country Link
US (1) US20090127254A1 (fr)
EP (1) EP2061286A3 (fr)
CA (1) CA2643530A1 (fr)
DE (1) DE102007054782A1 (fr)

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FR2956047A1 (fr) * 2010-02-05 2011-08-12 Airbus Operations Sas Procede et dispositif de formage de pieces comportant un formage a chaud localise

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DE102009023060A1 (de) * 2009-05-28 2010-12-02 Mtu Aero Engines Gmbh Verfahren und Vorrichtung zum Oberflächenverfestigen eines Bauteils, welches zumindest im Bereich seiner zu verfestigenden Oberfläche aus einer intermetallischen Verbindung besteht
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
FR2956047A1 (fr) * 2010-02-05 2011-08-12 Airbus Operations Sas Procede et dispositif de formage de pieces comportant un formage a chaud localise
EP2363217A1 (fr) * 2010-02-05 2011-09-07 Airbus Operations (S.A.S) Procédé et dispositif de formage de pièces comportant un formage à chaud localisé

Also Published As

Publication number Publication date
EP2061286A3 (fr) 2013-09-25
DE102007054782A1 (de) 2009-05-20
CA2643530A1 (fr) 2009-05-16
US20090127254A1 (en) 2009-05-21

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