EP3262202A2 - 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

Info

Publication number
EP3262202A2
EP3262202A2 EP16702923.0A EP16702923A EP3262202A2 EP 3262202 A2 EP3262202 A2 EP 3262202A2 EP 16702923 A EP16702923 A EP 16702923A EP 3262202 A2 EP3262202 A2 EP 3262202A2
Authority
EP
European Patent Office
Prior art keywords
press
cooling
air
cooling device
plant
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
EP16702923.0A
Other languages
German (de)
English (en)
Other versions
EP3262202B1 (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
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP3262202A2 publication Critical patent/EP3262202A2/fr
Application granted granted Critical
Publication of EP3262202B1 publication Critical patent/EP3262202B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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 system for the mass production of press-hardened and corrosion-protected sheet metal parts by direct press hardening zinc coated sheet steel blanks, with an oven, a press hardening tool and a
  • Cooling device for intermediate cooling of the steel sheet blanks heated in the oven.
  • Press-hardened sheet metal parts are produced by rapidly cooling a steel sheet material previously heated to austenitizing temperature (or higher) and simultaneously molding in a press-hardening tool. Quench hardening in the press hardening tool achieves strengths of up to 1650 MPa and more. Such high-strength sheet metal parts are, for example, used as body or chassis components in vehicle construction. Various methods for producing press-hardened sheet-metal shaped parts are known from the prior art.
  • Corrosion protection coating is provided, which is in particular a zinc or zinc alloy coating.
  • Procedures for the production of press-hardened and corrosion-protected shaped sheet metal parts are known from the prior art, in which the starting sheet material already has a zinc or zinc alloy coating (referred to in the following only as
  • Zinc coating called) has. For this purpose, for example, on the
  • Press-hardening of zinc-precoated sheet metal materials can result in microcracks in the zinc coating that penetrate through the zinc coating into the Steel sheet material can extend.
  • DE 10 201 1 053 939 A1 discloses a method for producing a hardened steel component with a coating of zinc or a zinc alloy
  • the invention is intended to show ways in which the intermediate cooling of the heated blanks can be improved in mass production of press-hardened and corrosion-protected shaped sheet metal parts using zinc or zinc alloy coated steel sheets.
  • claim 1 relates to a first embodiment and claim 5, a second embodiment.
  • a plant or device comprises: a furnace or a furnace device (ie at least one furnace or at least one furnace device) in which the sheet steel blanks (hereinafter also referred to as blanks) can be heated or heated to austenitizing temperature (or higher);
  • a press-hardening tool i.e., at least one press-hardening tool typically installed in a press in which the heated platens can be directly hot-formed and press-hardened;
  • a cooling or intermediate cooling device that is to say at least one cooling device with which the blanks heated or heated in the oven can be completely or at least partially or partially intercooled before they are placed in the press hardening tool;
  • the first embodiment of a system according to the invention is characterized in that the cooling device comprises two oppositely arranged air knife, with which an air curtain to the active
  • the two air knives lie opposite each other. It is preferably provided that the cooling device has at least two air knives, which, in particular stationary, each other
  • Air knives moving through heated blanks allows.
  • the two air knives are arranged on opposite sides of a spacing gap and in particular arranged stationary, wherein the heated boards are moved through this spacing gap and thereby actively cooled by the air curtain generated by the air knife.
  • Particularly preferred is at least one upper and at least one lower air knife.
  • cooling air or possibly cooling gas, for example. Carbon dioxide, or steam
  • An air knife is understood to be a specially designed air nozzle or group of air nozzles with which a linear narrow air stream, which, for example, is only between 0.5 mm and 1.0 mm thin, can be produced.
  • the generated knife-like air flow can be referred to as air curtain.
  • Air knives are known from the prior art and are used in press shops, for example, for blowing 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.
  • Liquid drops are, for. B. to water drops that, for example.
  • the ice particles may, for example, be dry ice particles or snowflakes that are added to the air curtain.
  • the admixed liquid droplets or ice particles cause an improvement in the cooling and allow, for example, higher cooling rates and / or shorter cycle times.
  • the cooling effect can be influenced.
  • the air knives of the cooling device are arranged in a sinker outlet region of the furnace, wherein provision is made, in particular, for a lower air knife to be arranged between transport rollers or transport rollers (a roller conveyor or the like).
  • the cooling device for the intermediate cooling can thus be arranged virtually neutral in space in the system.
  • the air knives of the cooling device are arranged in a sinker outlet region of the furnace, wherein provision is made, in particular, for a lower air knife to be arranged between transport rollers or transport rollers (a roller conveyor or the like).
  • the cooling device for the intermediate cooling can thus be arranged virtually neutral in space in the system.
  • the cooling device for the intermediate cooling can thus be arranged virtually neutral in space in the system
  • the second possible embodiment of a 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 carry the boards and thereby also an active intermediate cooling (according to the above definition) selbiger can allow.
  • the cooling device can furthermore have lateral guide elements for the boards.
  • An air nozzle arrangement is understood to mean a multiplicity of air nozzles (that is to say at least two air nozzles) which are designed and arranged such that the generation of an air cushion is possible.
  • the air nozzles are arranged in particular stationary.
  • a two-sided air or possibly also gas admission is made possible, in particular from below and above, so that the preferably relative to the air nozzle arrangement moving boards can be actively cooled simultaneously from both sides.
  • Air nozzle assembly for generating a liquid droplet and / or ice particles containing air cushion may be formed.
  • the air nozzle arrangement can be arranged in the outlet region of the furnace.
  • Both the air nozzle arrangement of the second embodiment possibility and the air knife of the first embodiment possibility can / be designed such that it can be switched on and off and / or changeable in the achievable cooling performance or cooling effect / are.
  • the air nozzle assembly or the air knife is only turned on when a previously heated board should be cooled. In the cycle time intervals, the air nozzle assembly or the air knife can be turned off, for example, to reduce energy consumption (switching on and off in the production cycle clock cycle).
  • Turning off is also a sleep mode or the like conceivable.
  • the switching on and off and / or changing the cooling capacity can, for example, be accomplished by means of a control device.
  • the system according to the invention can have devices for measuring the temperature of the boards in order to be able to detect or measure, for example, the insertion temperature of the intermediately cooled boards on the press-hardening tool. It is preferably provided that the system according to the invention comprises at least one thermal imaging camera or the like arranged in particular in the region of the cooling device (for example an infrared or thermographic camera) and / or at least one and
  • cooling device thermal line scanner or the like eg., Line pyrometer
  • Cooling over time can be detected during intermediate cooling of the boards or can be detected.
  • the system according to the invention comprises a control device for
  • Control of the air nozzle assembly or the air knife is designed, in particular, to be able to control the intercooling of the boards in a control loop with the aid of the thermal imaging camera or the thermal line scanners.
  • Such a regulation can, for example, be such that at each
  • cooling board detects the cooling progress and, where appropriate, the cooling capacity of the air nozzle assembly or the air knife is changed to achieve a desired or required cooling and / or cooling rate.
  • Both embodiments of a system according to the invention allow mass production of press-hardened and corrosion-protected sheet metal parts by direct press hardening of zinc coated blanks (by this is meant steel blanks precoated with a zinc or zinc alloy plating).
  • Direct press hardening is understood to mean that a heated blank without preforming is shaped directly into a sheet metal part in the press hardening tool and at the same time a hardening or strength increase is brought about by rapid cooling (see also corresponding explanations in US Pat
  • Intermediate cooling system according to the invention makes it possible to eliminate or at least reduce the risk of cracking otherwise present in direct press hardening of zinc-coated blanks.
  • the invention is also suitable for retrofitting existing systems.
  • Fig. 1 shows schematically the first possible embodiment of a
  • inventive plant for mass production of press-hardened and corrosion-protected sheet metal parts.
  • Fig. 2 shows schematically the second possible embodiment of a
  • inventive plant for mass production of press-hardened and corrosion-protected sheet metal parts.
  • Fig. 1 shows a system 100 for producing press-hardened sheet metal parts 210 in series.
  • the plant 100 comprises a furnace 1 10 and a press hardening tool 130, which is installed in a press 140.
  • the plant 00 may further comprise a robot or the like, with which automatically heated in the oven 110 Boards 200 can be added in the outlet region 1 15 of the furnace 110 and inserted into the press-hardening tool 130.
  • the furnace 10 is a continuous furnace, although other suitable types of furnace are known from the prior art.
  • the arrow DR gives the
  • the boards 200 have a particular applied on both sides zinc coating, as explained above, so that the produced press-hardened sheet metal moldings 210 are corrosion protected.
  • the printed circuit boards 200 can also be tailor-made boards, so-called tailored blanks (for example rolled tailored blanks or welded tailored blanks).
  • the plant 100 further comprises a in the outlet region 115 of the furnace 1 10
  • planar sinkers 210 with concomitant press hardening is also referred to as direct press hardening.
  • the produced press-hardened sheet-metal shaped parts 210 may be completely or even partially or partially press-hardened.
  • Fig. 1 In the first embodiment shown in Fig. 1 comprises the
  • Cooling device 120 an upper air knife 121 and a between the
  • Transport rollers or rollers 116 arranged lower air knife 122.
  • the two air knives 121/122 are arranged stationary. With these opposing air knives 121/122, an air curtain L for active intermediate cooling of the moving between these air knives 121/122 boards 200 can be generated.
  • the air flows generated by the air knives 121/122 can be
  • the air knife 121/122 can also be arranged offset to each other in the horizontal direction. Furthermore, a plurality of upper and / or lower air knives may be provided.
  • Cooling device 120 quasi blown off and here, for example, cooled down from above 900 ° C to 700 ° C.
  • the blow-off can also have the advantage that any adhering contaminants are removed. Blowing off can also be oblique
  • the system 100 further comprises two thermal line scanners 141 and 142, which are spaced apart in the direction of passage DR between the
  • Transport rollers or rollers 116 are arranged in the outlet region 115.
  • the scanners 141/142 are connected to an evaluation and control device 150.
  • the control device 150 is also designed for a control and, in particular, regulation of the air knives 121/122.
  • using the control device 150 and the flow rate of the boards 200 are changed.
  • a component-specific documentation can be done.
  • Plant 100 according to the invention comprises the cooling device 120 in the
  • Outlet region 1 15 of the furnace 110 fixedly arranged air nozzle assembly 125 with upper and lower air nozzles.
  • no transport rollers or rollers 116 are provided (i.e., the respective conveyor section in FIG.
  • Outlet area 1 15 is transport roller or transport roller free).
  • Air nozzle assembly 125 an air cushion or air cushion K can be generated, on which the from the oven 110 coming boards 200 are moved through the cooling device 120 more or less contactless and thereby cooled down by air supply on both sides.
  • the boards are 200,
  • Cooling 120 looking thermal imaging camera 145 or the like provided.
  • the camera 145 can be designed as a line scan camera. Otherwise, the preceding explanations apply analogously to the first possible embodiment according to FIG. 1.

Landscapes

  • 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)

Abstract

L'invention concerne une installation (100) pour la fabrication en série de pièces moulées de tôle (210) durcies sous presse et protégées contre la corrosion par durcissement direct sous presse de plaques de tôle d'acier zinguées (200). L'installation (100) comprend un four (110), un outil de durcissement sous presse (130) et un système de refroidissement (120). Les plaques de tôle d'acier (200) chauffées dans le four (110) peuvent être refroidies transitoirement avec le système de refroidissement (120) avant que celles-ci ne soient placées dans l'outil de durcissement sous presse (130). Pour améliorer le refroidissement intermédiaire, le système de refroidissement (120) présente selon l'invention au moins deux lames d'air (121, 122) opposées, permettant de produire un rideau d'air (L) pour le refroidissement intermédiaire actif des plaques (200), ou bien le système de refroidissement (120) présente un dispositif à buses d'air permettant de produire un coussin d'air qui peut porter les plaques (200) et permet alors un refroidissement intermédiaire actif des plaques (200).
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 true EP3262202A2 (fr) 2018-01-03
EP3262202B1 EP3262202B1 (fr) 2024-05-01

Family

ID=55300500

Family Applications (1)

Application Number Title Priority Date Filing Date
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)

Country Link
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

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59300055D1 (de) * 1993-02-23 1995-02-16 Schleicher Gmbh & Co Hermann Fördersystem für metallische Platinen und Bänder.
DE102008039264A1 (de) * 2008-08-22 2010-03-04 Schuler Cartec Gmbh & Co. Kg Verfahren zum Formhärten mit Zwischenkühlung
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
DE102011053939B4 (de) 2011-09-26 2015-10-29 Voestalpine Stahl Gmbh Verfahren zum Erzeugen gehärteter Bauteile
GB201116668D0 (en) * 2011-09-27 2011-11-09 Imp Innovations Ltd A method of forming parts from sheet steel
DE102012210693A1 (de) * 2012-06-25 2014-04-24 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zum Herstellen eines bereichsweise unterschiedlich gehärteten Blechformteils
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
DE102014114394B3 (de) * 2014-10-02 2015-11-05 Voestalpine Stahl Gmbh Verfahren zum Erzeugen eines gehärteten Stahlblechs
DE102014114740B3 (de) * 2014-10-10 2015-07-23 Schuler Pressen Gmbh Verfahren zum Herstellen gehärteter Stahlbauteile

Also Published As

Publication number Publication date
DE102015203406A1 (de) 2016-09-01
WO2016134934A3 (fr) 2016-10-20
WO2016134934A2 (fr) 2016-09-01
EP3262202B1 (fr) 2024-05-01

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