EP2561108A2 - Procédé et dispositif de déformation à chaud et de traitement thermique de tôles métalliques revêtues - Google Patents

Procédé et dispositif de déformation à chaud et de traitement thermique de tôles métalliques revêtues

Info

Publication number
EP2561108A2
EP2561108A2 EP11743181A EP11743181A EP2561108A2 EP 2561108 A2 EP2561108 A2 EP 2561108A2 EP 11743181 A EP11743181 A EP 11743181A EP 11743181 A EP11743181 A EP 11743181A EP 2561108 A2 EP2561108 A2 EP 2561108A2
Authority
EP
European Patent Office
Prior art keywords
inductor
sheet
temperature
heating
induction heating
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Withdrawn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
EP11743181A
Other languages
German (de)
English (en)
Inventor
Hans-Joachim Schwiese
Torge Behrens
Gerd Hintz
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.)
Trumpf Huettinger GmbH and Co KG
Original Assignee
Huettinger Elektronik GmbH 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 Huettinger Elektronik GmbH and Co KG filed Critical Huettinger Elektronik GmbH and Co KG
Publication of EP2561108A2 publication Critical patent/EP2561108A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/60—After-treatment
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • a pre-cut or danced sheet is heated to a temperature greater than 800 ° C, especially between 800 ° C and 1000 ° C and then formed and simultaneously cooled and cured.
  • This makes it possible to form very hard and stable steels which are used, for example, in the automobile body.
  • they are of particular interest, because with such shaped steel sheets, the thickness and the number of sheets in load-bearing body parts can be reduced. This makes it easier to build automobiles, which saves fuel and CO 2 emissions and improves crash performance.
  • the sheets are usually made of steel.
  • the sheet may already be coated before heating, for example with an A-silicon silicon layer (AISi). Such a layer prevents scaling during hot sheet forming and forms the basis for painting.
  • AISi A-silicon silicon layer
  • the sheet usually has thicknesses less than 3 mm.
  • the thickness of the sheets is usually homogeneous before the hot sheet metal forming, but this is not mandatory.
  • the sheet may already be pre-cut or punched in the mold, so one represent any shape. It has different areas, which are usually between 0.2 m J and 2 m *.
  • For heating conventional ovens are usually used, which transfer the heat by means of heat radiation or hot air to the sheets. When heated, the coating melts and it arrives
  • the object of the invention is to provide a method and a device which enables fast, energy-efficient and space-saving hot sheet metal forming.
  • the object is achieved by a method for hot sheet metal forming, in which a pre-cut or danced sheet is heated to a temperature greater than 800 ° C and then reformed and simultaneously cooled and cured, and wherein the heating of the sheet in a first step by inductive heating by means of a first induction heating device to a first temperature is less than or equal to the Curie temperature and in a second step, the heating to temperatures greater than 800 ° C by conventional heating in an oven or by means of inductive heating in a second, different from the first
  • Indutationse reappears wherein the sheet with a protective layer is coated, which is melted after heating to the first temperature and wherein the melting point of the protective layer is below the first temperature.
  • Induction heating device consists essentially at least of a medium or high frequency generating power unit, an output resonant circuit and an inductor, which may be part of the output resonant circuit.
  • Output resonant circuit may be a parallel or series resonant circuit or a
  • the inductor generates an alternating
  • Magnetic field which generates eddy currents and magnetic reversals in the sheet, which lead to heating of the sheet. If the sheet has a high permeability, the coupling is better and the sheet heats up faster. The induced eddy currents are forced by electromagnetic effects on the surface of the sheet. This effect is frequency dependent. For up to 3 mm thick sheet, a penetration depth of up to 1.5 mm is desirable. The frequency must be kept comparatively low, it is in tests between 5 and 30 kHz, in particular at 15 kHz. The inductance of the inductor must not be too large at these frequencies. Otherwise, the voltage at the output resonant circuit can increase to very high values. Too high voltages increase the risk of flashovers z. B. on the inductor or in capacities of the Alisgangsschwingnikes. The sheet has to be heated homogeneously. Inhomogeneities in the warming lead to a different rapid melting of the
  • the melting point of the protective layer may be below the Curie temperature.
  • a temperature below the Curie temperature may also be required.
  • the diffusion process for AISi is between 600 ° C and 650 ° C.
  • the Curie temperature for the steel sheets used is 710 ° C to 770 ° C.
  • the heating in the first step can take place in two substeps.
  • the sheet In a first sub-step, the sheet can be heated to a first temperature and in a second substep, the sheet can be kept at a temperature more than 70 K lower than the first temperature.
  • a very homogeneous melting of a protective layer can be achieved, and the Diffussionsvorgang can also be very homogeneous.
  • a protective layer can be completely melted on the metal sheet in the first sub-step.
  • the first temperature can be suitably selected so that the protective layer is completely and homogeneously melted on the sheet.
  • the first temperature may be close to the Curie temperature, that is 710 ° C to 770 ° C.
  • a diffusion process can take place in the second substep. This can now be done very homogeneously, since the protective layer has already melted particularly homogeneous.
  • the diffusion process for AISi is between 600 ° C and 650 ° C. For other materials, a suitable different temperature range may be chosen.
  • the sheet is not moved during the first step. This can improve the homogeneity.
  • the sheet can also be deliberately moved during the first step. This may be useful if the structure of the inductor leads to a still insufficient homogeneity of the heating of the sheet. Direct under a conductor portion of an inductor, the heating may be higher than between two conductor portions of the inductor. The sheet can now be moved perpendicular to the conductor sections to achieve improved homogeneity of the heating of the sheet.
  • the object of the invention is also achieved by an induction heating device with a medium- or high-frequency generating power unit, a
  • An output resonant circuit for homogeneously heating a precut or danced steel sheet by means of an inductor arrangement comprising a first inductor and a second inductor, the first inductor being electrically connectable in parallel with the second inductor and having a substantially comparable inductance and shape, the first inductor being mounted on the first inductor Is arranged on top of the sheet and the second inductor is arranged on the underside of the sheet, and that the first inductor is formed so that at least in the region of the sheet-like extent of the sheet, the current at a time in several arranged in a first plane
  • Induktorabitesen flows in only one direction and the current in the second inductor is formed so that at least in the area of the flat extent of the sheet metal Current at the same time in the said inductor portions of the first inductor facing in a plane parallel to the first plane level inductor sections also flows only in one direction.
  • An inductor with sufficiently low inductance can be realized, which ensures at the same time a sufficiently homogeneous heating.
  • An inductor formed in this way can be, for example, a so-called butterfly inductor. He leads all his Induktorabête in the region of the sheet to be heated in one direction only. The return of the inductor winding is outside the range of the sheet to be heated.
  • the two inductors may drive the current in opposite directions in each of the inductor sections.
  • an inductor with sufficiently low inductance can be realized, which ensures at the same time a sufficiently homogeneous heating.
  • additional steel components may be arranged at least partially at the edges of the steel sheet. This improves the homogeneity in the edge areas of the steel sheet.
  • the additional steel components may be arranged at least at the edges of the steel sheet, which run parallel to the direction of flow in the inductors, since in these areas inhomogeneities in the
  • said inductor portions of the first inductor may be offset from the inductor portions of the second inductor. This leads to an improved homogeneity of the heating.
  • the induction heating device may be used to carry out any of the above
  • Fig. 2 process steps according to the inventive method
  • FIG. 3 Induction heating device according to the invention
  • FIG. 4a Side view of an inductor arrangement of the induction heating device according to the invention
  • FIG. 4b shows a side view of the inductor arrangement of FIG. 4a with the first inductor removed
  • FIG. 5a shows a section through an inductor arrangement with non-offset inductor sections
  • FIG. 5b shows a section through an inductor arrangement with offset inductor sections
  • FIG. 6 shows a perspective drawing of an inductor arrangement according to the invention
  • a heating curve is shown by the inventive method. To the right is the course of time t and up the temperature T of the sheet to be heated applied. At time to the inductive heating begins after the first step 1 and after the first sub-step la. At time ti, the first temperature T t is reached. This may be the Curie temperature of the sheet or a temperature very close to it. Between the times ti and t 2 , the sheet cools and is then held until the time t 3 at a constant temperature T 2 . The second sub-step 1 b is therefore between the times and 13. After the time t3, the second step 2 can take place in which the sheet is heated to temperatures greater than 800 ° C.
  • a temperature gradient of greater than 30 K / s can be achieved. This allows plates to be heated from 10 ° C to over 700 ° C in less than 25 s.
  • the diffusion process can be chosen larger than 50 s. Good results can be achieved by ending the diffusion process after 60 seconds to 90 seconds.
  • FIG. 2 shows the method steps according to the method according to the invention.
  • the first step 1 can be subdivided into a first
  • Sub-step la in which the sheet is heated to a first temperature
  • a second substep lb in which the sheet is kept at a temperature
  • the second temperature should be higher than the melting temperature of the coating.
  • a temperature has proved to be advantageous, which is more than 70 K lower than the first temperature.
  • an induction heating device 30 according to the invention is shown. It has a medium or high frequency generating power unit 31, a
  • Output resonant circuit 32 and an inductor 34 The inductor 34 is conventional Part of the output resonant circuit 32, so here too.
  • the output resonant circuit 32 has additional capacitances 33 in series or parallel to the inductor 34, which is indicated schematically here.
  • the inductor 34 is shown a butterfly shape, which is characterized in that in a predetermined region 35, in which, for example, the sheet to be heated, the current in all inductor portions 36 at a time always flows in the same direction, indicated by arrows is indicated.
  • a second inductor (not shown) may be connected.
  • Fig. 4a is a side view of an inductor of the
  • the bends 41 and 42 show the connection bridges of the inductor arrangement to the rest of the
  • the inductor arrangement has a first and a second inductor.
  • the first inductor 44 is disposed on the upper surface of the steel sheet 45
  • the second inductor 43 is disposed on the lower surface of the steel sheet 45.
  • Electrically insulating and heat resistant spacers 46 hold the sheet in a constant position in two parallel planes to each other.
  • FIG. 4b shows a second side view of the inductor arrangement of FIG. 4a with the first inductor 44 removed.
  • the same reference numbers were used for the same components.
  • the steel sheet 45 may be placed between and taken out of the inductors 43, 44 with a robot gripper (not shown), one of the inductors is constructed so that it can be lifted and the
  • Robot gripper provides enough space to grab the sheet metal.
  • Fig. 5a is a section through an inductor arrangement with unequipped
  • FIG. 5b is a section through a Inductor shown with offset inductor sections.
  • the first inductor 44 is disposed on the upper side of the steel sheet 45
  • the second inductor 43 is disposed on the lower surface of the steel sheet 45.
  • the inductor sections 44a of the first inductor 44 lying in a first plane show all the currents pointing in the same direction in the region of the steel sheet 45. In this case, a point means a stream flowing towards the observer, a cross a stream flowing away from the observer.
  • the inductor sections 43a of the second inductor 43 lying in a second plane likewise show the currents pointing in the same direction in the region of the steel sheet 45 but pointing in the opposite direction to the current direction of the inductor sections 44a.
  • two additional steel components 47a, 47b are arranged. This results in a more homogeneous heat distribution in the steel sheet 45.
  • FIG. 6 shows a perspective drawing of an inductor arrangement according to the invention.
  • the connection bridges 41 from FIGS. 4 a and 4 b can also be seen here, as well as the inductor sections 43 a, 43 b, 43 c, 44 a, 44 b, 44 c from FIG. 5.
  • the connection 62 can be connected to the remainder of the outer oscillating circuit 32. Since the upper inductor 44 is liftable for receiving and removing a sheet, not shown here, it has contact jaws 63 a and 63 b, with which it can be connected electrically parallel to the lower inductor 43.
  • the electrically insulating brackets 61 and 62 are for adjustment when folding down the upper inductor 44.
  • the sheet which is not shown, can be moved in the direction of the arrow 64 during all steps and substeps to increase the homogeneity.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Induction Heating (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Coating With Molten Metal (AREA)

Abstract

L'invention concerne un procédé de déformation à chaud de la tôle, comprenant une première étape dans laquelle une tôle est chauffée par induction au moyen d'un premier dispositif de chauffage par induction à une température inférieure ou égale au point de Curie, et une seconde étape dans laquelle la tôle est chauffée à des températures supérieures à 800°C au moyen d'un chauffage conventionnel dans un four ou au moyen d'un chauffage par induction dans un deuxième dispositif de chauffage par induction, différent du premier.
EP11743181A 2010-04-21 2011-04-21 Procédé et dispositif de déformation à chaud et de traitement thermique de tôles métalliques revêtues Withdrawn EP2561108A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010017905.1A DE102010017905B4 (de) 2010-04-21 2010-04-21 Verfahren und Induktionserwärmungsvorrichtung zur Warmblechumformung
PCT/DE2011/000437 WO2011131174A2 (fr) 2010-04-21 2011-04-21 Procédé et dispositif de déformation à chaud de la tôle

Publications (1)

Publication Number Publication Date
EP2561108A2 true EP2561108A2 (fr) 2013-02-27

Family

ID=44630098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11743181A Withdrawn EP2561108A2 (fr) 2010-04-21 2011-04-21 Procédé et dispositif de déformation à chaud et de traitement thermique de tôles métalliques revêtues

Country Status (3)

Country Link
EP (1) EP2561108A2 (fr)
DE (1) DE102010017905B4 (fr)
WO (1) WO2011131174A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014110415B4 (de) 2014-07-23 2016-10-20 Voestalpine Stahl Gmbh Verfahren zum Aufheizen von Stahlblechen und Vorrichtung zur Durchführung des Verfahrens
DE102017202377A1 (de) 2017-02-15 2018-08-16 Volkswagen Aktiengesellschaft Verfahren zur Wärmebehandlung, Verfahren zur Warmumformung, Vorrichtung zur Durchführung des Verfahrens und Kraftfahrzeug
DE102017120128A1 (de) * 2017-09-01 2019-03-07 Schwartz Gmbh Verfahren zum Erwärmen eines metallischen Bauteils auf eine Zieltemperatur und entsprechender Rollenherdofen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993012628A1 (fr) * 1991-12-18 1993-06-24 Giovanni Arvedi Four a induction

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2808163B1 (fr) * 2000-04-19 2002-11-08 Celes Dispositif de chauffage par induction a flux transverse a circuit magnetique de largeur variable
JP4884606B2 (ja) * 2001-07-11 2012-02-29 新日本製鐵株式会社 加熱成形用鋼板の加熱方法
DE102004007071B4 (de) * 2004-02-13 2006-01-05 Audi Ag Verfahren zur Herstellung eines Bauteils durch Umformen einer Platine und Vorrichtung zur Durchführung des Verfahrens
DE102007039279B3 (de) * 2007-08-20 2009-01-02 Muhr Und Bender Kg Wärmebehandlung von flexibel gewalztem Band
DE102008006771B3 (de) * 2008-01-30 2009-09-10 Thyssenkrupp Steel Ag Verfahren zur Herstellung eines Bauteils aus einem mit einem Al-Si-Überzug versehenen Stahlprodukt und Zwischenprodukt eines solchen Verfahrens
DE102009055317A1 (de) * 2008-12-23 2010-06-24 Technische Universität Graz - Graz University of Technology Verfahren zum Behandeln beschichteter Bleche

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993012628A1 (fr) * 1991-12-18 1993-06-24 Giovanni Arvedi Four a induction

Also Published As

Publication number Publication date
WO2011131174A2 (fr) 2011-10-27
WO2011131174A3 (fr) 2012-01-05
DE102010017905A1 (de) 2011-10-27
DE102010017905B4 (de) 2014-08-21

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