EP3262202B1 - Installation pour la fabrication en série de pièces moulées de tôle durcies sous presse et protégées contre la corrosion, comprenant un système de refroidissement pour le refroidissement intermédiaire des plaques - Google Patents

Installation pour la fabrication en série de pièces moulées de tôle durcies sous presse et protégées contre la corrosion, comprenant un système de refroidissement pour le refroidissement intermédiaire des plaques Download PDF

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Publication number
EP3262202B1
EP3262202B1 EP16702923.0A EP16702923A EP3262202B1 EP 3262202 B1 EP3262202 B1 EP 3262202B1 EP 16702923 A EP16702923 A EP 16702923A EP 3262202 B1 EP3262202 B1 EP 3262202B1
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EP
European Patent Office
Prior art keywords
blanks
cooling
press
air
cooling device
Prior art date
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EP16702923.0A
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German (de)
English (en)
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EP3262202A2 (fr
Inventor
Markus Pfestorf
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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    • 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
    • C21D8/0294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a localised treatment
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0494—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a localised treatment

Definitions

  • the invention relates to a plant for the series production of press-hardened and corrosion-protected sheet metal parts by direct press-hardening of zinc-coated sheet steel blanks, with a furnace, a press-hardening tool and a cooling device for intermediate cooling of the sheet steel blanks heated in the furnace.
  • Press-hardened sheet metal parts are manufactured by rapidly cooling a steel sheet material that has previously been heated to austenitizing temperature (or higher) and simultaneously shaping it in a press-hardening tool. Quenching hardening in the press-hardening tool achieves strengths of up to 1650 MPa and more. Such high-strength sheet metal parts are used, for example, as body or chassis components in vehicle construction. Various processes for producing press-hardened sheet metal parts are known from the state of the art.
  • press-hardened sheet metal parts can be provided with a metallic corrosion protection coating, which is in particular a zinc or zinc alloy coating.
  • a metallic corrosion protection coating which is in particular a zinc or zinc alloy coating.
  • methods for producing press-hardened and corrosion-protected sheet metal parts are known in which the starting sheet material already has a zinc or zinc alloy coating (hereinafter referred to collectively as zinc coating).
  • zinc coating for this purpose, for example, reference is made to the EN 10 2009 016 852 A1 the applicant.
  • the invention is intended to demonstrate a possibility of how the intermediate cooling of the heated blanks can be improved in the series production of press-hardened and corrosion-protected sheet metal parts using zinc- or zinc alloy-coated steel sheets.
  • a first possible embodiment of the system is characterized in that the cooling device has two air knives arranged opposite one another, with which an air curtain can be generated for the active intermediate cooling of the boards.
  • the two air knives are located opposite one another.
  • this cooling device has at least two air knives which are arranged opposite one another, in particular in a stationary manner, and with which an air curtain can be generated, wherein this air curtain enables active intermediate cooling of the heated boards moved between these air knives.
  • the two air knives are arranged on opposite sides of a spacing gap and in particular in a stationary manner, wherein the heated boards can be moved through this spacing gap and can be actively intermediate cooled by the air curtain generated with the aid of the air knives.
  • Active intermediate cooling is understood to mean a targeted cooling or a defined cooling down of the heated blanks by applying cooling air (or possibly steam).
  • This intermediate cooling which is carried out by the cooling device, is intended to quickly and specifically cool down the blanks that were previously heated in the furnace to the austenitizing temperature (or higher), for example cooling from over 900 °C to approx. 750 °C or even only to approx. 700 °C and cooling rates of at least 10 Klsec, preferably at least 20 K/sec and in particular at least 30 Klsec can be achieved.
  • An air knife is a specially designed air nozzle or group of air nozzles with which a linear, narrow air flow can be generated, which is, for example, only between 0.5 mm and 1.0 mm thick.
  • the knife-like air flow generated can be referred to as an air curtain.
  • Air knives are known from the state of the art and are used in press shops, for example, to blow off sheets and coils.
  • the air knives of the cooling device can be designed to produce an air curtain containing liquid drops and/or ice particles.
  • the liquid drops are, for example, water drops that are mixed into the air curtain, e.g. as water vapor or spray mist.
  • the ice particles can be, for example, dry ice particles or snowflakes that are mixed into the air curtain.
  • the mixed liquid drops or ice particles improve the cooling and enable, for example, higher cooling speeds and/or shorter cycle times.
  • the cooling effect can be influenced by changing the dosage.
  • the air knives of the cooling device are arranged in a blank discharge area of the furnace, wherein it is particularly provided that a lower air knife is arranged between transport rollers or transport rollers (of a roller conveyor or
  • the cooling device for the intermediate cooling can thus be arranged in a way that is virtually space-neutral in the system.
  • the discharge movement of the blanks can also be used for the passage between the air knives, so that the intermediate cooling can take place in a time-neutral way.
  • the second possible embodiment of the system according to the invention is characterized in that the cooling device has an air nozzle arrangement with which an air cushion can be generated which can support the boards and also enable active intermediate cooling (as defined above) of the same.
  • the cooling device can also have lateral guide elements for the boards.
  • an air nozzle arrangement is understood to mean a plurality of air nozzles (i.e. at least two air nozzles) which are designed and arranged in such a way that the generation of an air cushion is possible.
  • the air nozzles are arranged in a fixed position.
  • the air nozzles allow air to be applied from both sides, namely from below and above, so that the boards, which are preferably moved relative to the air nozzle arrangement, can be actively cooled from both sides at the same time.
  • the air nozzle arrangement can be designed to generate an air cushion containing liquid drops and/or ice particles.
  • the air nozzle arrangement can also be arranged in the outlet area of the furnace.
  • Both the air nozzle arrangement of the second embodiment and the air knives of the first embodiment can be designed in such a way that they can be switched on and off and/or the cooling power or cooling effect that can be achieved can be changed.
  • the air nozzle arrangement or the air knives are only switched on when a previously heated board is to be cooled.
  • the air nozzle arrangement or the air knives can be switched off, for example to reduce the energy requirement (switching on and off in the production cycle time rhythm).
  • a sleep mode or the like is also conceivable.
  • the switching on and Switching off and/or changing the cooling performance can be accomplished, for example, using a control device.
  • the system according to the invention can have devices for measuring the temperature of the blanks in order to be able to record or measure the insertion temperature of the intermediately cooled blanks on the press hardening tool, for example.
  • the system according to the invention has at least one thermal imaging camera or the like (e.g. an infrared or thermography camera), arranged in particular in the area of the cooling device, and/or at least one and in particular several thermal line scanners or the like (e.g. line pyrometers) arranged in the area of the cooling device, with which the cooling and in particular the cooling progress (cooling curve over time) can be recorded during the intermediate cooling of the blanks.
  • the system according to the invention preferably comprises a control device for controlling the air nozzle arrangement or the air knives.
  • This control device is designed in particular to be able to regulate the intermediate cooling of the boards in a control loop using the thermal imaging camera or the thermal line scanners.
  • Such a control can be carried out, for example, in such a way that the cooling progress is recorded for each board to be intermediately cooled and, if necessary, the cooling capacity of the air nozzle arrangement or the air knives is changed in order to achieve a desired or required cooling and/or cooling speed.
  • Both versions of the system enable the series production of press-hardened and corrosion-protected sheet metal parts by direct press hardening of zinc-coated blanks (this refers to steel sheet blanks pre-coated with a zinc or zinc alloy coating).
  • Direct press hardening means that a heated blank is formed into a sheet metal part directly in the press hardening tool without pre-forming and at the same time hardened or increased in strength by rapid cooling. (see also the corresponding explanations in the EN 10 2011 053 939 A1 ).
  • the effort and associated costs in particular tool costs due to the multiple tools required) are significantly lower with direct press hardening.
  • the intermediate cooling made possible in the system according to the invention eliminates or at least reduces the risk of cracking that otherwise exists with direct press hardening of zinc-coated blanks.
  • the invention is also suitable for retrofitting existing systems.
  • Fig.1 shows a system 100 not according to the invention for producing press-hardened sheet metal parts 210 in series.
  • the system 100 comprises a furnace 110 and a press-hardening tool 130, which is installed in a press 140.
  • the system 100 can also comprise a robot or the like, with which the blanks 200 heated in the furnace 110 can be automatically picked up in the outlet area 115 of the furnace 110 and placed in the press-hardening tool 130.
  • the furnace 110 is, for example, a continuous furnace, although other suitable furnace designs are also known from the prior art.
  • the arrow DR indicates the direction of passage of the blanks 200.
  • the blanks 200 have a zinc coating applied in particular on both sides, as explained above, so that the press-hardened sheet metal parts 210 produced are protected against corrosion.
  • the blanks 200 can expressly also be tailor-made blanks, so-called tailored blanks (e.g. rolled tailored blanks or welded tailored blanks).
  • the system 100 further comprises a cooling device 120 arranged in the outlet area 115 of the furnace 110, with which the zinc-coated blanks 200 heated to austenitizing temperature in the furnace 110 can be intermediately cooled before they are placed in the press hardening tool 130 and formed or hot-formed there into corrosion-protected sheet metal parts 200.
  • the direct forming of the flat blanks 210 with accompanying press hardening is also referred to as direct press hardening.
  • the press-hardened sheet metal parts 210 produced can be completely or only partially or partially press hardened. The intermediate cooling and the effects achieved thereby are explained in detail above.
  • the cooling device 120 comprises an upper air knife 121 and a lower air knife 122 arranged between the transport rollers or cylinders 116.
  • the two air knives 121/122 are arranged in a fixed position. With these opposing air knives 121/122, an air curtain L can be generated for the active intermediate cooling of the boards 200 moving between these air knives 121/122. Liquid drops and/or ice particles can be mixed into the air streams generated by the air knives 121/122.
  • the air knives 121/122 can also be arranged offset from one another in the horizontal direction. Furthermore, a plurality of upper and/or lower air knives can be provided.
  • the blanks 200 coming out of the furnace 110 are virtually blown off as they pass through the cooling device 120 and are thereby cooled down, for example, from over 900 °C to 700 °C. Blowing off can also have the advantage of removing any adhering contaminants. Blowing off can also take place from oblique directions. By switching the air knives 121/122 on and off and/or by changing the cooling power they provide, only certain areas of the blanks can be cooled. Intermediate cooling or intermediate cooling of the boards 200 that creates different temperature ranges is possible.
  • the system 100 also has two thermal line scanners 141 and 142, which are arranged at a distance from one another in the direction of travel DR between the transport rollers or cylinders 116 in the discharge area 115. With the help of these stationary scanners 141/142, the cooling progress of the boards 200 moving past can be recorded in real time.
  • the scanners 141/142 are connected to an evaluation and control device 150.
  • the control device 150 is also designed to control and in particular regulate the air knives 121/122. If necessary, the speed of the boards 200 passing through can also be changed with the help of the control device 150.
  • component-specific documentation can be carried out.
  • the cooling device 120 comprises an air nozzle arrangement 125 with upper and lower air nozzles arranged in a fixed position in the outlet area 115 of the furnace 110. No transport rollers or cylinders 116 are provided in this section (ie the relevant conveyor section in the outlet area 115 is free of transport rollers or cylinders).
  • the air nozzle arrangement 125 can be used to create an air cushion or air pad K on which the blanks 200 coming out of the furnace 110 are moved more or less contactlessly through the cooling device 120 and are cooled down by air being applied on both sides.
  • the boards 200 are supported (fully or at least partially) by the air cushion K, if necessary with the use of guide elements, and are thereby conveyed through the cooling device 120 in a virtually contactless or floating manner, so that any surface impairments can be avoided due to the lack of roller or cylinder contact.
  • At least one thermal imaging camera 145 or the like is provided that looks into the cooling device 120.
  • the camera 145 can be a line scan camera.
  • the previous explanations for the first execution option apply analogously according to Fig.1 .

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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)
  • Heat Treatment Of Articles (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Claims (7)

  1. Installation (100) pour la fabrication en série de pièces moulées en tôle (210) durcies sous presse et protégées contre la corrosion par durcissement direct sous presse d'ébauches de tôle d'acier (200) revêtues de zinc, comprenant :
    - un four (110) dans lequel les ébauches (200) sont aptes à être chauffées à la température d'austénitisation ;
    - un outil (130) de durcissement sous presse dans lequel les ébauches chauffées (200) sont aptes à être directement formées et durcies sous pression ; et
    - un dispositif de refroidissement (120), avec lequel les ébauches (200) chauffées dans le four (110) sont aptes à être refroidies temporairement avant d'être placées dans l'outil (130) de durcissement sous presse ; caractérisée en ce que
    le dispositif de refroidissement (120) présente un agencement (125) de buses d'air avec une pluralité de buses d'air, avec lequel un coussin d'air (K) est apte à être généré, lequel est apte à porter les ébauches (200) et permet alors également un refroidissement intermédiaire actif des ébauches (200), les buses d'air de l'agencement (125) de buses d'air étant disposées de manière fixe et permettant une alimentation en air des deux côtés par le bas et par le haut, de sorte que les ébauches (200) sont aptes à être refroidies activement des deux côtés simultanément.
  2. Installation (100) selon la revendication 1,
    caractérisée en ce que
    le dispositif de refroidissement (120) présente des éléments de guidage latéraux pour les ébauches (200).
  3. Installation (100) selon la revendication 1 ou la revendication 2,
    caractérisée en ce que
    l'agencement (125) de buses d'air est disposé dans une zone de sortie (115) du four (110).
  4. Installation (100) selon l'une des revendications précédentes,
    caractérisée en ce que
    l'agencement (125) de buses d'air est apte à être activé et désactivé et/ou sa puissance de refroidissement est apte à être modifiée.
  5. Installation (100) selon l'une des revendications précédentes,
    caractérisée en ce que
    au moins une caméra thermique (145) disposée dans la zone du dispositif de refroidissement (120) et/ou plusieurs scanners à lignes thermiques (141, 142) disposés dans la zone du dispositif de refroidissement (120), avec lesquels le refroidissement ou la progression du refroidissement est apte à être détecté(e) lors du refroidissement intermédiaire.
  6. Installation (100) selon l'une des revendications précédentes,
    caractérisée en ce que
    un dispositif de commande (150) pour la commande de l'agencement (125) de buses d'air.
  7. Installation (100) selon les revendications 5 et 6, caractérisée en ce que
    le dispositif de commande (150) est conçu pour pouvoir régler le refroidissement intermédiaire des ébauches (200) à l'aide de la caméra thermique (145) ou des scanners à lignes thermiques (141, 142).
EP16702923.0A 2015-02-26 2016-02-03 Installation pour la fabrication en série de pièces moulées de tôle durcies sous presse et protégées contre la corrosion, comprenant un système de refroidissement pour le refroidissement intermédiaire des plaques Active EP3262202B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015203406.2A DE102015203406A1 (de) 2015-02-26 2015-02-26 Anlage für die Serienfertigung pressgehärteter und korrosionsgeschützter Blechformteile, mit einer Kühleinrichtung zur Zwischenkühlung der Platinen
PCT/EP2016/052265 WO2016134934A2 (fr) 2015-02-26 2016-02-03 Installation pour la fabrication en série de pièces moulées de tôle durcies sous presse et protégées contre la corrosion, comprenant un système de refroidissement pour le refroidissement intermédiaire des plaques

Publications (2)

Publication Number Publication Date
EP3262202A2 EP3262202A2 (fr) 2018-01-03
EP3262202B1 true EP3262202B1 (fr) 2024-05-01

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EP16702923.0A Active EP3262202B1 (fr) 2015-02-26 2016-02-03 Installation pour la fabrication en série de pièces moulées de tôle durcies sous presse et protégées contre la corrosion, comprenant un système de refroidissement pour le refroidissement intermédiaire des plaques

Country Status (3)

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EP (1) EP3262202B1 (fr)
DE (1) DE102015203406A1 (fr)
WO (1) WO2016134934A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018109579A1 (de) 2018-04-20 2019-10-24 Schwartz Gmbh Temperiervorrichtung zur partiellen Kühlung eines Bauteils
DE102021110702A1 (de) 2021-04-27 2022-10-27 Voestalpine Metal Forming Gmbh Verfahren und Vorrichtung zum Herstellen gehärteter Stahlbauteile mit unterschiedlich duktilen Bereichen

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE102008039264A1 (de) * 2008-08-22 2010-03-04 Schuler Cartec Gmbh & Co. Kg Verfahren zum Formhärten mit Zwischenkühlung
DE102012210693A1 (de) * 2012-06-25 2014-04-24 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zum Herstellen eines bereichsweise unterschiedlich gehärteten Blechformteils
DE102011053939B4 (de) * 2011-09-26 2015-10-29 Voestalpine Stahl Gmbh Verfahren zum Erzeugen gehärteter Bauteile
WO2016050465A1 (fr) * 2014-10-02 2016-04-07 Voestalpine Stahl Gmbh Procédé de refroidissement intermédiaire de tôle en acier

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DE59300055D1 (de) * 1993-02-23 1995-02-16 Schleicher Gmbh & Co Hermann Fördersystem für metallische Platinen und Bänder.
JP4825882B2 (ja) * 2009-02-03 2011-11-30 トヨタ自動車株式会社 高強度焼き入れ成形体及びその製造方法
DE102009016852A1 (de) 2009-04-08 2010-10-14 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Herstellung wärmebehandelter Blechformteile aus einem Stahlblechmaterial mit einer Korrosionsschutzbeschichtung und derartiges Blechformteil
GB201116668D0 (en) * 2011-09-27 2011-11-09 Imp Innovations Ltd A method of forming parts from sheet steel
DE102013100682B3 (de) * 2013-01-23 2014-06-05 Voestalpine Metal Forming Gmbh Verfahren zum Erzeugen gehärteter Bauteile und ein Strukturbauteil, welches nach dem Verfahren hergestellt ist
DE102013002625B4 (de) * 2013-02-15 2015-03-05 Audi Ag Greifervorrichtung für den Transport erwärmter Blechplatinen, sowie Verfahren zum Herstellen von warmumgeformten und/oder pressgehärteten Blechformteilen
DE102014114740B3 (de) * 2014-10-10 2015-07-23 Schuler Pressen Gmbh Verfahren zum Herstellen gehärteter Stahlbauteile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008039264A1 (de) * 2008-08-22 2010-03-04 Schuler Cartec Gmbh & Co. Kg Verfahren zum Formhärten mit Zwischenkühlung
DE102011053939B4 (de) * 2011-09-26 2015-10-29 Voestalpine Stahl Gmbh Verfahren zum Erzeugen gehärteter Bauteile
DE102012210693A1 (de) * 2012-06-25 2014-04-24 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zum Herstellen eines bereichsweise unterschiedlich gehärteten Blechformteils
WO2016050465A1 (fr) * 2014-10-02 2016-04-07 Voestalpine Stahl Gmbh Procédé de refroidissement intermédiaire de tôle en acier

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Publication number Publication date
DE102015203406A1 (de) 2016-09-01
WO2016134934A3 (fr) 2016-10-20
WO2016134934A2 (fr) 2016-09-01
EP3262202A2 (fr) 2018-01-03

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