EP2264193A1 - Fabrication d'un composant en tôle partiellement durci à la presse - Google Patents

Fabrication d'un composant en tôle partiellement durci à la presse Download PDF

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Publication number
EP2264193A1
EP2264193A1 EP10160442A EP10160442A EP2264193A1 EP 2264193 A1 EP2264193 A1 EP 2264193A1 EP 10160442 A EP10160442 A EP 10160442A EP 10160442 A EP10160442 A EP 10160442A EP 2264193 A1 EP2264193 A1 EP 2264193A1
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EP
European Patent Office
Prior art keywords
sheet metal
press
hardened
hardening
metal part
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.)
Granted
Application number
EP10160442A
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German (de)
English (en)
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EP2264193B1 (fr
Inventor
Frank Dr. Ebert
Bernd Wölfer
Bernhard Glueck
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.)
Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP2264193A1 publication Critical patent/EP2264193A1/fr
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    • 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
    • C21D2221/00—Treating localised areas of an article

Definitions

  • the invention relates to a method for producing a partially press-hardened sheet metal component according to the preamble of claim 1.
  • the invention further relates to a cover device for producing a partially press-hardened sheet metal component and a motor vehicle body comprising a partially press-hardened sheet metal component.
  • press-hardening of sheet-metal components is well known from the prior art. Representative is in this regard on the GB 1 490 535 from the year 1974.
  • press-hardening the strength and / or hardness of a sheet material is increased by a heat treatment and final cooling in a press-hardening tool.
  • the increase in strength and / or hardness (hardening) of the sheet material is based essentially on a structural transformation.
  • a method for producing a press-hardened sheet metal component which has various areas which have a different degree of hardness.
  • a sheet metal component intermediate form produced in a first method step is heated in an oven to the required hardening temperature and then subjected in a press hardening tool a partially different cooling, for which a variety of tool concepts are known from the prior art.
  • a disadvantage is the sometimes very high tooling effort.
  • Another disadvantage is a difficult process management.
  • An object of the invention is to provide an improved method for producing such sheet metal components, which requires in particular a lower tooling complexity. Furthermore, an object of the invention to specify a body that can assist in the implementation of the procedure.
  • the inventive method is used to produce a partially press-hardened sheet metal component, wherein the starting sheet material is first formed into a sheet metal part and this forming is followed by a press hardening, for which this sheet metal part is partially heated in an oven, such that at least one not to harden or less to harden Covered area and / or shielded and thereafter the press hardening takes place.
  • a sheet metal component has a spatial shape design.
  • a partially press-hardened sheet-metal component is a sheet-metal component which has various regions (at least two) in which the sheet-metal material has a strength and / or hardness which can be differentiated from one another.
  • the sheet-metal component produced by the method according to the invention has at least one region in which the strength and / or hardness of the sheet metal material remains substantially unchanged relative to the starting sheet material. In essence, this means that due to various effects, even in such an area quite a slight increase in strength and / or hardening of the sheet material may occur, which, however, in the result significantly below that of the other area or the other area.
  • An “area” may be determined spatially and / or areally.
  • “Strength” is understood to mean a material property of the sheet material which describes the mechanical resistance which the material of the sheet material brings about for plastic deformation or also for a separation.
  • “hardness” is understood a material property, which describes the mechanical resistance, which opposes the material of the sheet material of an external mechanical action. Strength and hardness can be correlated according to common material models. Curing can also influence the ductility of the material.
  • the invention is based on the idea to achieve a partial press-hardening of the sheet metal component by a different, partial heating of the sheet material, wherein the not to be hardened or less hardened area is covered and this covered and / or shielded area in the oven not on the required Hardening temperature can heat and / or the required hardening temperature in this range can not be maintained for a sufficient period of time. Covering virtually results in thermal shielding of the covered area.
  • the press-hardened sheet-metal component acquires locally different properties due to the different insertion temperatures in the press-hardening tool, which primarily includes hardness, strength and / or ductility.
  • a deformation of the starting sheet material into a sheet metal shaped part takes place, by which is meant a sheet metal part intermediate shape.
  • This can be done in a single-stage or multi-stage deep drawing process. This is preferably a cold forming.
  • a partial heating of this sheet metal part takes place in an oven.
  • an oven For this purpose, at least one area of the sheet metal part which is not to be hardened or less hardened is covered and thermally shielded.
  • the partially covered and / or shielded sheet metal part is placed as a whole in the oven.
  • a furnace is preferably a continuous furnace.
  • a protective gas atmosphere may be formed. Furthermore, such an oven may have different temperature zones.
  • the press hardening of the partially heated sheet metal part in a press-hardening tool a uniform and / or partially differentiated cooling of the sheet metal material can take place, whereby defined the hardening and / or increase in strength of the sheet material occurs.
  • the method according to the invention can be supplemented by intermediate steps, further steps and / or further partial steps, some of which are the subject of preferred developments.
  • the invention provides i.a. the advantage that even existing press hardening plants can be converted easily and at relatively low cost to a partial press hardening. Another advantage is in particular the possibility of partial press hardening coated steel materials, as explained in more detail below.
  • a sheet metal component produced by the method according to the invention is, in particular, a body component of a motor vehicle (motor vehicle body component).
  • a body component of a motor vehicle (motor vehicle body component).
  • This may be a structural part, e.g. a B-pillar part, or an attachment part, such as a bumper reinforcement.
  • the sheet metal component it may be e.g. also act as a chassis member, such as e.g. an axle carrier.
  • the uncovered and / or shielded region of the sheet metal part is heated in the oven to above 900 ° C.
  • the aim is that, in a steel material, this range will reach the austenitizing temperature required for press hardening and that this range will be maintained in the oven for a sufficiently long time at this austenitizing temperature, e.g. is adjustable in the oven by the residence time of the sheet metal part.
  • austenitizing in the covered and thermally shielded area is wholly or at least partially prevented by the partial covering, whereby in this area no or only a lower quench hardening during press hardening is possible.
  • the shape of the formed sheet metal part ie the sheet metal component intermediate form, substantially already corresponds to that of the partially press-hardened sheet metal component to be produced.
  • the shape of the formed sheet metal part ie the sheet metal component intermediate form, substantially already corresponds to that of the partially press-hardened sheet metal component to be produced.
  • no further shaping is required or only a very small shaping (eg in the region of component radii), which is indicated by the expression "substantially”. This is particularly advantageous with regard to the surface of the sheet metal component to be produced, even if the sheet metal material optionally has a coating.
  • the press-hardened sheet-metal component subsequently no longer has to be trimmed. This can be achieved by a corresponding trimming the sheet metal part, which is less expensive. Furthermore, even before the press hardening, possibly also directly into the output board, holes and recesses can be introduced.
  • the starting sheet material is a coated steel sheet.
  • the coating serves e.g. as corrosion protection.
  • Such a coating is in particular a zinc-containing coating, which is in particular essentially formed from zinc, and which has preferably already been applied by the manufacturer.
  • zinc-coated starting sheet materials is largely unproblematic.
  • steel sheet material in particular a steel material of the type 22MnB5 or 16MnB5 is provided.
  • the degree of thermal shielding of a relevant area to be covered is adjusted by the choice of the cover, a cover material, its nature and / or its arrangement on the sheet metal part.
  • cover e.g. Blankets, reusable cover devices (as explained in more detail below) or specifically applied cover materials into consideration.
  • the degree of thermal shielding may be e.g. be measured in percent.
  • a 100% thermal shield can be considered as a thermal insulation, which substantially prevents heating of the sheet material during the residence time in the oven in the shielded area.
  • a lower thermal shield leads to heating of the shielded area and a corresponding increase in strength and / or hardening of the sheet material during the press hardening, which is significantly lower than that of the other, uncovered area.
  • the strength and / or hardness of the sheet metal material that results during press hardening can thus be adjusted in a targeted manner.
  • a plurality of regions of the sheet metal part are covered so that different degrees of thermal Shielding result.
  • a component may be referred to as a complex press-hardened sheet metal component.
  • the covering takes place by means of at least two shell molds, which are applied on both sides of the sheet metal part in the area concerned. It is preferably provided that an inner contour of such a shell mold corresponds to the spatial contour of the sheet metal part in the area to be covered or this is approximated.
  • a mold shell can be flexible or rigid. On a sheet metal part several shell molds of different design can be arranged.
  • such a mold shell is essentially formed from a heat-resistant fiber material.
  • this fiber material is pressed and used in particular compression molded.
  • a heat-resistant fiber material is in particular a rock wool, a silicate wool, an asbestos material or an asbestos substitute material.
  • a mold shell is formed from a ceramic material.
  • a mold shell is formed from a ceramic foam material.
  • a mold shell is formed from a metallic material.
  • a mold shell is formed from a sheet metal material.
  • it may be e.g. to act a section of an identical sheet metal part, one of which is placed in the area to be covered on the sheet metal part and placed under.
  • a mold shell is formed from a composite material.
  • a composite material may for example be formed of several of the aforementioned materials, which are arranged for example in a sandwich structure.
  • a mold shell does not essentially rest directly on the sheet metal molding. Rather, a spacing or a spacing gap is provided between the surface of the sheet metal part and the inner surface of the mold shell to allow a relative thermal movement to each other and the surface of the sheet metal part and possibly their coating to protect against damage. By means of such a spacing, the degree of thermal shielding can also be changed. However, the mold shell and the sheet metal part can touch one another in a punctiform manner, which is indicated by the phrase "essentially".
  • a heat-resistant material is arranged at least in sections between a mold shell, in particular a metallic or ceramic shell mold, and the sheet metal molded part.
  • a material may be e.g. to be one of the aforementioned materials or a composite material formed therefrom, e.g. in the form of a flexible mat or a flexible braid is available.
  • the covering device according to the invention serves to cover a region which is not to be hardened or less hardened during the heating of a press-hardening sheet metal part in an oven.
  • it is a reusable cover, whereby costs can be reduced.
  • the covering device is designed as a unit which is designed to completely receive the area of the press-hardening sheet-metal shaped part which is not to be hardened or less hardened.
  • the covering device comprises at least one mold shell according to the above statements, which in particular rigid, i. dimensionally stable, is formed.
  • the covering device has at least one means for automated attachment and / or removal on or from the press-hardening sheet-metal shaped part. This will be explained in more detail below in connection with the figures.
  • the method according to the invention is preferably carried out using at least one covering device according to the invention.
  • Fig. 1 shows the inventive method for producing a partially press-hardened sheet metal component according to a preferred embodiment in a schematic overview.
  • the illustrated method comprises six steps I to VI, wherein further steps and / or sub-steps may be provided, such as a Entgraden or cleaning, which are not listed in detail.
  • step I begins in step I with the provision of a sheet of hardenable steel sheet material.
  • This board is formed in step II in the cold state to form a sheet metal part.
  • the forming takes place in particular by deep drawing.
  • step III individual areas of this sheet metal part, ie at least one area covered, which should not be cured in a subsequent press hardening or only to be less hardened.
  • step IV the partially covered sheet metal part, together with the covers, is placed in an oven. In the oven, the uncovered areas are heated to austenitizing temperature (> 900 ° C, sometimes up to 950 ° C) and kept at this temperature level over a defined period of time.
  • austenitizing temperature > 900 ° C, sometimes up to 950 ° C
  • the covered areas are not heated at all or only slightly heated, as long as the residence time in the furnace is not too long and / or the temperature in the furnace is not too high.
  • a press hardening tool is arranged in a closing device, in particular a press.
  • the press-hardening tool is closed by means of the closing device, whereby the heated sheet-metal molding sections are quenched and hardened in the cooled press-hardening tool (quench hardening).
  • step 6 the press-hardened sheet metal component is removed from the press-hardening tool to be subsequently processed further.
  • Fig. 2 shows the inner reinforcement part 10 of a B-pillar for a motor vehicle body.
  • This is a press-hardened sheet metal component made of a steel sheet material.
  • the internal reinforcement stiffener 10 has a longitudinal web 13, which merges at its lower longitudinal end into a transverse web 12, which is provided for connection to a side sill, and which merges at its upper longitudinal end into a transverse web 11, which is provided for connection to a roof construction is.
  • the longitudinal web 13 has two connection points 14 and 15 for the door hinges of a vehicle door.
  • the press-hardened inner reinforcement part 10 should have a lower strength and / or hardness, possibly also ductility, than in the other areas.
  • the press-hardened internal reinforcement part 10 is produced by the process according to the invention, as explained above.
  • the specified range 17 is for explanation only. Also, several such areas may be provided.
  • a covering device according to the invention can be used, such as one below in connection with FIG Fig. 3 is explained by way of example.
  • Fig. 3a shows a reusable cover 20 in a schematic sectional view.
  • the cover device 20 is designed as a multi-part unit, in which the inner reinforcement part 10 is received with the region 17 and protrudes by way of example on the right side.
  • the covering device 20 comprises a lower part 21 and an upper part 22, which are each rigidly formed.
  • the lower part 21 has a sandwich structure which is formed from an outer shell 23 and an inner shell 24.
  • the upper part 22 also has a sandwich structure, which is likewise formed from an outer shell mold 25 and from an inner mold shell 26.
  • the outer shell molds 23 and 25 are e.g. formed of a metal material or a ceramic material, which is advantageous in particular with regard to the shielding of thermal radiation in the furnace and the mechanical strength and stability of the covering device 20.
  • the inner shell molds 24 and 26 are e.g. formed of a heat-resistant and heat-insulating fiber material, as explained above.
  • the thickness and / or nature (e.g., density) of the inner shell molds 24 and 26 may include i.a. the thermal shield can be adjusted.
  • the inner mold shells 24 and 26 are flexible and are supported by the outer mold shells 23 and 25.
  • the inner shell molds 24 and 26 are formed dimensionally stable, which is e.g. can be achieved by an in-molding Pessen the fiber material in conjunction with additives.
  • the inner shell molds 24 and 26 may themselves be constructed in multiple layers. Here, e.g. As a result, a very good thermal insulation can be achieved by a different fiber orientation in the individual layers.
  • the outer shell molds 23 and 25 may be fixedly connected to the inner shell molds 24 and 26.
  • the inner shell molds 24 and 26 can be loosely inserted into the outer shell molds 23 and 25, whereby a slight interference effect is possible by a slight oversize.
  • a modular design proves to be particularly advantageous in case of repair of the thermally highly stressed cover 20.
  • the upper part 22 and the lower part 21 are hingedly connected to each other via at least one hinge 28.
  • the cover device 20 can be scissor-like around an unspecified hinge point for attaching and removing, or for inserting and removing the internal reinforcement part 10, to open.
  • the opening can be done, for example, by applying a force F to the actuator arm 29, which is located on the left side of the hinge 28 and which belongs to the upper part 22.
  • the closing of the cover 20 is preferably carried out automatically, in particular by gravity. This makes it very easy to automate the attachment and / or removal of the cover 20.
  • the hinge 28 is designed heat-resistant and formed, for example, as a ceramic bearing.
  • a spacing in the form of a spacing gap 30 is provided between the surface of the inner reinforcement part 10 and the inner shell molds 24 and 26. This shows Fig. 3b which has an enlarged section of the Fig. 3a reproduces.
  • a spacing gap 30 may, inter alia, enable a relative thermal movement and protect the surface of the inner reinforcement part 10 from damage.
  • the spacing gap 30 can be very small and is preferably less than the sheet thickness of the inner reinforcement part 10.
  • Fig. 4 shows an alternative embodiment of a covering device 20a in a schematic sectional view.
  • the main difference to the possibility of execution of Fig. 3 is that the inner, formed from a fiber material mold shells 24 and 26 are included.
  • inner support shells 41 and 42 are provided, which bear against the inner reinforcement part 10 directly or even spaced.
  • These inner support shells 41 and 42 are formed, for example, of a metal material or a ceramic material and may, like the outer shell molds 23 and 25 also, be one or more parts.
  • the outer shell molds 23 and 25, and the inner support shells 41 and 42 are formed by component cutouts, which are spaced apart by an insulating material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP10160442.9A 2009-05-29 2010-04-20 Fabrication d'un composant en tôle partiellement durci à la presse Active EP2264193B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009023195.1A DE102009023195B4 (de) 2009-05-29 2009-05-29 Herstellung eines partiell pressgehärteten Blechbauteils

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Publication Number Publication Date
EP2264193A1 true EP2264193A1 (fr) 2010-12-22
EP2264193B1 EP2264193B1 (fr) 2016-07-27

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013189597A1 (fr) * 2012-06-22 2013-12-27 Steinhoff & Braun's Gmbh Procédé et dispositif de fabrication d'un composant métallique trempé à la presse
WO2017081072A1 (fr) 2015-11-09 2017-05-18 Outokumpu Oyj Procédé de fabrication d'un élément en acier austénitique et utilisation de ce élément
WO2020114703A1 (fr) * 2018-12-04 2020-06-11 Bayerische Motoren Werke Aktiengesellschaft Procédé de formage à chaud d'un demi-produit, notamment plat
US11781198B2 (en) 2016-12-07 2023-10-10 Ebner Industrieofenbau Gmbh Temperature control device for the temperature control of a component

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Publication number Priority date Publication date Assignee Title
DE102011016477B4 (de) 2011-04-08 2017-05-18 InnoCoat GmbH Vorrichtung und Verfahren zur teilweisen Lack-Freihaltung von Flächen auf Werkstücken, einschließlich zur Temperatur- und Durchschlagsspannungsmessung mittels Maskierungswerkzeug
DE102011101991B3 (de) * 2011-05-19 2012-08-23 Volkswagen Aktiengesellschaft Wärmebehandlung von härtbaren Blechbauteilen
DE102013212816B4 (de) * 2013-07-01 2016-03-24 Volkswagen Aktiengesellschaft Verfahren zur Herstellung eines partiell pressgehärteten Blechformteils durch direktes Presshärten
DE202013011800U1 (de) 2013-07-24 2014-10-27 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Linienverstärktes Kraftfahrzeugblech, insbesondere Karosserieblech
DE102014010661A1 (de) 2014-07-18 2016-01-21 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Blech und Verfahren zu dessen Behandlung
DE102014215365A1 (de) * 2014-08-05 2016-02-11 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Herstellung von warmumgeformten Bauteilen
DE102015207928B4 (de) 2015-04-29 2018-05-17 Volkswagen Aktiengesellschaft Verfahren und Werkzeug zur Herstellung pressgehärteter Blechformteile mit unterschiedlichen Festigkeitsbereichen durch Vorprägen des Blechmaterials
DE102015014490A1 (de) 2015-11-10 2017-05-11 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren zur Verarbeitung eines Blechwerkstücks
DE102017110864B3 (de) 2017-05-18 2018-10-18 Voestalpine Metal Forming Gmbh Verfahren und Vorrichtung zum Erzeugen gehärteter Stahlblechbauteile mit unterschiedlichen Blechdicken
DE102017125473B3 (de) * 2017-10-30 2019-03-28 Voestalpine Metal Forming Gmbh Verfahren und Vorrichtung zur Herstellung von partiell gehärteten Stahlblechbauteilen

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GB1490535A (en) 1973-11-06 1977-11-02 Norrbottens Jaernverk Ab Manufacturing a hardened steel article
EP0632137A1 (fr) * 1993-05-19 1995-01-04 HEIMSOTH VERWALTUNGEN GmbH & CO. KG Beteiligungsgesellschaft Procédé pour le prétraitement thermique de pièces métalliques
DE10341867A1 (de) 2003-09-09 2005-03-31 Volkswagen Ag Verfahren und Vorrichtung zur Herstellung eines gehärteten Blechprofils
DE102004038626B3 (de) * 2004-08-09 2006-02-02 Voestalpine Motion Gmbh Verfahren zum Herstellen von gehärteten Bauteilen aus Stahlblech
WO2006038868A1 (fr) * 2004-10-04 2006-04-13 Gestamp Hardtech Ab Procede d'estampage a chaud et de durcissement de toles
DE102004054795A1 (de) * 2004-11-12 2006-05-24 Thyssenkrupp Automotive Ag Verfahren zur Herstellung von Blechbauteilen sowie Karosseriebauteil

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DE20014361U1 (de) 2000-08-19 2000-10-12 Benteler Ag, 33104 Paderborn B-Säule für ein Kraftfahrzeug
DE10305725B3 (de) 2003-02-12 2004-04-08 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Formbauteils aus Stahl mit mindestens zwei Gefügebereichen unterschiedlicher Duktilität
DE102006018406B4 (de) * 2006-03-06 2012-04-19 Elisabeth Braun Verfahren zum Erwärmen von Werkstücken, insbesondere zum Presshärten vorgesehener Blechteile
JP4575976B2 (ja) * 2008-08-08 2010-11-04 アイシン高丘株式会社 局所的加熱装置及び方法

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
GB1490535A (en) 1973-11-06 1977-11-02 Norrbottens Jaernverk Ab Manufacturing a hardened steel article
EP0632137A1 (fr) * 1993-05-19 1995-01-04 HEIMSOTH VERWALTUNGEN GmbH & CO. KG Beteiligungsgesellschaft Procédé pour le prétraitement thermique de pièces métalliques
DE10341867A1 (de) 2003-09-09 2005-03-31 Volkswagen Ag Verfahren und Vorrichtung zur Herstellung eines gehärteten Blechprofils
DE102004038626B3 (de) * 2004-08-09 2006-02-02 Voestalpine Motion Gmbh Verfahren zum Herstellen von gehärteten Bauteilen aus Stahlblech
WO2006038868A1 (fr) * 2004-10-04 2006-04-13 Gestamp Hardtech Ab Procede d'estampage a chaud et de durcissement de toles
DE102004054795A1 (de) * 2004-11-12 2006-05-24 Thyssenkrupp Automotive Ag Verfahren zur Herstellung von Blechbauteilen sowie Karosseriebauteil

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013189597A1 (fr) * 2012-06-22 2013-12-27 Steinhoff & Braun's Gmbh Procédé et dispositif de fabrication d'un composant métallique trempé à la presse
WO2017081072A1 (fr) 2015-11-09 2017-05-18 Outokumpu Oyj Procédé de fabrication d'un élément en acier austénitique et utilisation de ce élément
EP3173504A1 (fr) 2015-11-09 2017-05-31 Outokumpu Oyj Procédé de fabrication d'un composant d'acier austenitique et utilisation dudit composant
US11781198B2 (en) 2016-12-07 2023-10-10 Ebner Industrieofenbau Gmbh Temperature control device for the temperature control of a component
WO2020114703A1 (fr) * 2018-12-04 2020-06-11 Bayerische Motoren Werke Aktiengesellschaft Procédé de formage à chaud d'un demi-produit, notamment plat
US11878333B2 (en) 2018-12-04 2024-01-23 Bayerische Motoren Werke Aktiengesellschaft Method for hot forming a semifinished product, in particular in sheet form

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Publication number Publication date
EP2264193B1 (fr) 2016-07-27
DE102009023195A1 (de) 2010-12-02
DE102009023195B4 (de) 2018-12-20

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