EP1462192B1 - Method for forming a plate of heat treatable steel and device for carrying out thereof - Google Patents

Method for forming a plate of heat treatable steel and device for carrying out thereof Download PDF

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Publication number
EP1462192B1
EP1462192B1 EP04005921A EP04005921A EP1462192B1 EP 1462192 B1 EP1462192 B1 EP 1462192B1 EP 04005921 A EP04005921 A EP 04005921A EP 04005921 A EP04005921 A EP 04005921A EP 1462192 B1 EP1462192 B1 EP 1462192B1
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EP
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Prior art keywords
prefabricated component
forming
heat
treating
component
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EP04005921A
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German (de)
French (fr)
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EP1462192A1 (en
Inventor
Bernd Dr. Griesbach
Peter Hochholdinger
Hubert Waltl
Gerhard Schiessl
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Audi AG
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Audi 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering

Definitions

  • the invention relates to a method for forming a blank from a tempered steel according to claim 1 and an apparatus for performing the method according to the preamble of claim 6.
  • a planar blank made of a tempering steel is austenitized in a furnace, preferably a continuous furnace under a protective gas atmosphere.
  • a 22MnB5 tempering steel can be used, which for austenitizing takes about 7 min. annealed at about 950 ° C.
  • the hot austenitized planar board is placed in a preferably automated transfer device in a cooled for serial processes forming-Nergütungstechnikmaschine. This tool is part of a press and when closing the press, the hot board is formed into a component to final shape and quickly cooled in the closed mold with applied closing force and thereby hardened.
  • the hardened component is removed from the tool and descaled in a cleaning step, for example by sand or shot peening.
  • a Fertigkontur- and Lochberough the finished molded and cured Component preferably by means of laser cutting.
  • a piece galvanizing for corrosion protection is eliminated.
  • a disadvantage of the above methods are the complex process steps for cleaning / descaling in connection with the disposal of the scale and the costly trim in the cured state of the component, which is regularly perform laser cutting or possibly with high-strength mechanical Spezialbeitestechnikmaschineen.
  • the object of the invention is to propose a method for forming a blank made of tempered steel and a device for carrying out the method, which lead to a reduction of the process and device costs.
  • a "soft" prefabricated component is already produced from the still uncured board at ambient temperature with conventional forming measures, which already corresponds to the hardened prefabricated component in terms of its geometry including the cut.
  • this shaping by the subsequent process steps in particular the curing caused minor changes in shape and material, eg. B. low expansion for example, by scaling the precast component by 1%. This can advantageously be omitted trimming the cured component, since all shaping and trimming measures are performed before curing.
  • an industrial robot with a gripping arm is suitable.
  • the tempering / cooling tool includes a press device with directly or indirectly coolable press tools.
  • the press tools have contact surfaces which correspond in shape to the geometry of the soft prefabricated component produced in the first method step.
  • pre-fabricated component and closed press device are thus (without further component forming) only cooling contact surfaces between the prefabricated component and the press tools manufactured to ensure a good and rapid heat transfer.
  • the press device thus only needs to apply the force for the closing operation of the press tools without additional forming force, so that the tempering / cooling tool in comparison to the prior art is relatively easy and inexpensive to manufacture and operate.
  • the tempering / cooling tool can be closed and indirectly or directly cooled Contain tools that correspond to the production of cooling surfaces of the geometry of the prefabricated component, where appropriate, with only very small process-related and coordinated deviations.
  • the process sequence according to the invention for forming a blank 1 made of a tempered steel by means of a device 2 is shown schematically.
  • a so-called coil 3 the steel is unrolled, smoothed and the size of the board 1 necessary for a prefabricated component 7 punched out or cut off by means of a tool 4.
  • the still uncured board 1 is formed in a press 5 at ambient temperature by means of mechanical force into a soft prefabricated component 6 and also trimmed, so that with respect to the shape, the contour section and possible cutouts the precast component 6 already corresponds to the hardened finished component 7 with respect to its geometry.
  • the soft prefabricated component 6 is fed to a furnace 8 and austenitized there under a protective gas atmosphere 9.
  • the protective gas atmosphere 9 is in Fig. 1 drawn only schematically in the form of a gray box.
  • the tempering / cooling tool 11 is coupled to a cooling device 13.
  • the component transfer from the exit of the furnace 8 to the tempering / cooling tool 11 takes place in a space with protective gas atmosphere 9, so that cleaning or descaling of the prefabricated component 7 can advantageously be dispensed with. Subsequently, the hardened prefabricated component 7 can be galvanized in a zinc bath 14 for corrosion protection.
  • the tempering / cooling tool can be made easier because no relative high Umformungsschstedmaschine, as in a forming press necessary, is required.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

A process for deformation of a plate bar from heat treated steel by the steps:deformation of a preprepared structural part (6) from an unhardened plate bar (1) at a deformation temperature by mechanical force to produce a structural part of geometry already corresponding to that of the hardened finished part (7), austenization of part (6) under a shielding atmosphere (9), and final hardening of part (6) by a heat treatment/cooling tool (11) to give the finished part (7). An independent claim is included for a device including a press (5) for production of prepared part (6), an oven (8), a transport unit (10), tool (11).

Description

Die Erfindung betrifft ein Verfahren zur Umformung einer Platine aus einem Vergütungsstahl nach Anspruch 1 und einer Vorrichtung zur Durchführung des Verfahrens nach dem Oberbegriff des Anspruchs 6.The invention relates to a method for forming a blank from a tempered steel according to claim 1 and an apparatus for performing the method according to the preamble of claim 6.

Es sind mehrere Umformverfahren für Platinen aus einem Vergütungsstahl in Verbindung mit Härtungsprozessen allgemein bekannt:Several forming processes for tempered steel blanks in conjunction with hardening processes are well known:

Bei einem allgemeinen bekannten direkten Umformverfahren wird eine ebene Platine aus einem Vergütungsstahl in einem Ofen, vorzugsweise einem Durchlaufofen unter Schutzgasatmosphäre austenitisiert. Beispielsweise kann ein Vergütungsstahl in der Qualität 22MnB5 verwendet werden, der für die Austenitisierung ca. 7 min. bei ca. 950°C geglüht wird. Anschließend wird mit einer vorzugsweise automatisierten Transfereinrichtung die heiße austenitisierte ebene Platine in ein für Serienprozesse gekühltes Umform-Nergütungswerkzeug eingelegt. Dieses Werkzeug ist Bestandteil einer Presse und beim Schließen der Presse wird die heiße Platine zu einem Bauteil auf Endform umgeformt und im geschlossenen Werkzeug bei aufgebrachter Schließkraft schnell abgekühlt und dadurch gehärtet. Das gehärtete Bauteil wird aus dem Werkzeug entnommen und in einem Reinigungsschritt beispielsweise durch Sand- oder Kugelstrahlen entzundert. Nun folgt in einem weiteren Verfahrensschritt ein Fertigkontur- und Lochbeschnitt des fertig geformten und gehärteten Bauteils vorzugsweise mittels Laserschneiden. In einem abschließenden Verfahrensschritt erfolgt eine Stückverzinkung zum Korrosionsschutz. Bei Verwendung von feueraluminierten Blechen entfallen die Prozessschritte Entzunderung und Stückverzinkung.In a generally known direct forming process, a planar blank made of a tempering steel is austenitized in a furnace, preferably a continuous furnace under a protective gas atmosphere. For example, a 22MnB5 tempering steel can be used, which for austenitizing takes about 7 min. annealed at about 950 ° C. Subsequently, the hot austenitized planar board is placed in a preferably automated transfer device in a cooled for serial processes forming-Nergütungswerkzeug. This tool is part of a press and when closing the press, the hot board is formed into a component to final shape and quickly cooled in the closed mold with applied closing force and thereby hardened. The hardened component is removed from the tool and descaled in a cleaning step, for example by sand or shot peening. Now follows in a further process step a Fertigkontur- and Lochbeschnitt the finished molded and cured Component preferably by means of laser cutting. In a final process step, a piece galvanizing for corrosion protection. When using hot-dip aluminized sheets, the process steps of descaling and piece galvanizing are eliminated.

Bei einem weiter allgemein bekannten, sogenannten indirekten Verfahren zur Umformung einer Platine aus einem Vergütungsstahl wird mittels konventioneller Umformverfahren, insbesondere durch mechanisches Tiefziehen und eventuell einem mechanischem Vorbeschneiden aus einer ebenen Platine ein Vorformteil hergestellt, das je nach den Gegebenheiten ca. 80 bis 95 % der Endgeometrie aufweist. Dieses Vorformteil wird in einem Ofen erwärmt und in ein gekühltes Umform-/Vergütungswerkzeug eingelegt. Auch hier ist das gekühlte Umform-Vergütungswerkzeug Bestandteil einer Presse, wobei beim schnellen Schließen des Werkzeugs durch die Presse das heiße Vorformteil durch weitere Umformung auf die Endform gebracht wird. Im geschlossenen Werkzeug wird bei aufgebrachter Schließkraft dann das Bauteil gehärtet. Die sich nun anschließenden Verfahrensschritte Reinigen, Entzundern, Beschneiden und Stückverzinken entsprechen den vorstehend beschriebenen Verfahren und können hier nicht entfallen, da insbesondere auch eine Feueraluminierung bei der hier kalten Vorformung geschädigt werden würde.In a further well-known, so-called indirect process for forming a blank from a tempered steel is prepared by conventional forming process, in particular by mechanical deep drawing and possibly a mechanical pre-cutting from a flat board, a preform, depending on the circumstances about 80 to 95% of End geometry has. This preform is heated in an oven and placed in a cooled forming / tempering tool. Again, the cooled forming-tempering tool is part of a press, the hot preform is brought by further deformation to the final shape during rapid closing of the tool by the press. In the closed tool, the component is then hardened when the closing force is applied. The now following process steps cleaning, descaling, trimming and piece galvanizing correspond to the methods described above and can not be omitted here, since in particular a fire aluminizing would be damaged in the here cold preforming.

Nachteilig bei den vorstehenden Verfahren sind die aufwendigen Verfahrensschritte für das Reinigen/Entzundern in Verbindung mit der Entsorgung des Zunders und der aufwendige Beschnitt im gehärteten Bauteilzustand, der regelmäßig über Laserschneiden oder allenfalls mit hochfesten mechanischen Spezialbeschnittwerkzeugen durchzuführen ist.A disadvantage of the above methods are the complex process steps for cleaning / descaling in connection with the disposal of the scale and the costly trim in the cured state of the component, which is regularly perform laser cutting or possibly with high-strength mechanical Spezialbeschnittwerkzeugen.

Aufgabe der Erfindung ist es, ein Verfahren zur Umformung einer Platine aus Vergütungsstahl sowie eine Vorrichtung zur Durchführung des Verfahrens vorzuschlagen, die zu einer Reduzierung des Verfahrens- und Vorrichtungsaufwands führen.The object of the invention is to propose a method for forming a blank made of tempered steel and a device for carrying out the method, which lead to a reduction of the process and device costs.

Diese Aufgabe wird hinsichtlich des Verfahrens mit den Merkmalen des Anspruchs 1 und hinsichtlich der Vorrichtung mit den Merkmalen des Anspruchs 6 gelöst.This object is achieved with regard to the method having the features of claim 1 and with regard to the device having the features of claim 6.

Im Vergleich zu den eingangs beschriebenen bekannten Umformverfahren wird bereits aus der noch ungehärteten Platine bei Umgebungstemperatur mit konventionellen Umformmaßnahmen ein "weiches" Vorfertigbauteil hergestellt, das hinsichtlich seiner Geometrie einschließlich des Beschnitts bereits dem gehärteten Fertigbauteil entspricht. Gegebenenfalls können bei dieser Formgebung durch die nachfolgenden Verfahrensschritte, insbesondere der Härtung bedingte geringe Form- und Materialveränderungen, z. B. geringe Ausdehnung berücksichtigt werden, indem das Vorfertigbauteil beispielsweise um 1 % kleiner skaliert wird. Damit kann vorteilhaft ein Beschnitt des gehärteten Bauteils entfallen, da alle Formgebungs- und Beschnittmaßnahmen bereits vor der Härtung ausgeführt sind.In comparison to the known forming processes described above, a "soft" prefabricated component is already produced from the still uncured board at ambient temperature with conventional forming measures, which already corresponds to the hardened prefabricated component in terms of its geometry including the cut. Optionally, in this shaping by the subsequent process steps, in particular the curing caused minor changes in shape and material, eg. B. low expansion for example, by scaling the precast component by 1%. This can advantageously be omitted trimming the cured component, since all shaping and trimming measures are performed before curing.

Da im Vergütungs-/Abkühlwerkzeug keine weitere Umformung oder Nachumformung mehr stattfindet, kann dieses im Vergleich zum Umform-/Vergütungswerkzeug nach dem Stand der Technik gegebenenfalls einfacher ausgeführt sein, da insbesondere keine relativ hohe Umformungsschließkraft einer Presse erforderlich ist.Since no further reshaping or Nachumformung more takes place in the tempering / cooling, this may possibly be simpler compared to the forming / tempering tool according to the prior art, as in particular no relatively high Umformungsschließkraft a press is required.

Durch die Verwendung einer Schutzgasatmosphäre für den Bauteiltransfer vom Ofenausgang zum Vergütungs-/Abkühlwerkzeug kann vorteilhaft das Reinigen/Entzundern des Bauteils entfallen.The use of a protective gas atmosphere for the transfer of components from the furnace outlet to the tempering / cooling tool advantageously eliminates the need for cleaning / descaling of the component.

Insgesamt ist damit das erfindungsgemäße Verfahren in Verbindung mit einem Härtungsprozess durch Wegfall von Verfahrensschritten im Vergleich zu den eingangs angegebenen Verfahren des Standes der Technik vereinfacht, was bei gleicher Bauteilqualität zu einer Reduzierung der Herstellkosten der Bauteile führt.Overall, the inventive method in conjunction with a curing process by eliminating process steps compared to the above-mentioned methods of the prior art is thus simplified, which leads to a reduction of the manufacturing costs of the components with the same component quality.

Zur Herstellung des "weichen" Vorfertigbauteils können gemäß Anspruch 2 gängige und gut beherrschbare konventionelle Umformverfahren wie mechanische Tiefziehverfahren und Beschnittverfahren unter Einsatz wenigstens einer Presse verwendet werden.In order to produce the "soft" prefabricated component, it is possible to use conventional and readily controllable conventional shaping methods, such as mechanical deep-drawing methods and trimming methods, using at least one press.

Nach Anspruch 3 ist es vorteilhaft, dass der Transfer des heißen Vorfertigbauteils vom Ofen zum Vergütungs-/Abkühlwerkzeug in der Schutzgasatmosphäre automatisiert mittels einer steuerbaren Transportvorrichtung durchgeführt wird.According to claim 3, it is advantageous that the transfer of the hot prefabricated component from the furnace to the tempering / cooling tool in the protective gas atmosphere is carried out automatically by means of a controllable transport device.

Als Transportvorrichtung ist beispielsweise ein Industrieroboter mit einem Greifarm geeignet.As a transport device, for example, an industrial robot with a gripping arm is suitable.

Gemäß Anspruch 4 enthält das Vergütungs-/Abkühlwerkzeug eine Presseneinrichtung mit unmittelbar oder mittelbar kühlbaren Pressenwerkzeugen. Die Pressenwerkzeugen weisen Anlageflächen auf, die in der Form der Geometrie des im ersten Verfahrensschritte hergestellten weichen Vorfertigbauteils entsprechen. Bei eingelegtem Vorfertigbauteil und geschlossener Presseneinrichtung werden somit (ohne weitere Bauteilumformung) lediglich Kühlanlageflächen zwischen dem Vorfertigbauteil und den Pressenwerkzeugen hergestellt, um einen guten und schnellen Wärmeübergang sicherzustellen. Die Presseneinrichtung braucht hier somit nur die Kraft für den Schließvorgang der Pressenwerkzeuge ohne zusätzliche Umformkraft aufzubringen, so dass das Vergütungs-/Abkühlwerkzeug im Vergleich zum Stand der Technik relativ einfach und kostengünstig herstellbar und betreibbar ist.According to claim 4, the tempering / cooling tool includes a press device with directly or indirectly coolable press tools. The press tools have contact surfaces which correspond in shape to the geometry of the soft prefabricated component produced in the first method step. When pre-fabricated component and closed press device are thus (without further component forming) only cooling contact surfaces between the prefabricated component and the press tools manufactured to ensure a good and rapid heat transfer. The press device thus only needs to apply the force for the closing operation of the press tools without additional forming force, so that the tempering / cooling tool in comparison to the prior art is relatively easy and inexpensive to manufacture and operate.

Nach Anspruch 5 kann sich in einem weiteren Verfahrensschritt eine Stückverzinkung zum Korrosionsschutz anschließen.According to claim 5 may be followed by a piece of galvanizing corrosion protection in a further process step.

Mit einer erfindungsgemäßen Vorrichtung sind die eingangs in Verbindung mit dem Verfahren erwähnten Vorteile erzielbar, wobei insbesondere nach Anspruch 7 das Vergütungs-/Abkühlwerkzeug schließbare und mittelbar oder unmittelbar kühlbare Werkzeuge enthalten soll, die zur Herstellung von Kühlanlageflächen der Geometrie des Fertigbauteils gegebenenfalls mit nur sehr geringen verfahrensablaufbedingten und abgestimmten Abweichungen entsprechen.With a device according to the invention, the advantages mentioned at the beginning in connection with the method can be achieved, wherein in particular according to claim 7, the tempering / cooling tool can be closed and indirectly or directly cooled Contain tools that correspond to the production of cooling surfaces of the geometry of the prefabricated component, where appropriate, with only very small process-related and coordinated deviations.

Anhand einer Zeichnung wird die Erfindung näher erläutert.Reference to a drawing, the invention is explained in detail.

In der einzigen Figur ist schematisch der erfindungsgemäße Verfahrensablauf zur Umformung einer Platine 1 aus einem Vergütungsstahl mittels einer Vorrichtung 2 gezeigt. Von dem im aufgerollten Zustand angelieferten Stahl, einem sogenannten Coil 3,wird mittels eines Werkzeugs 4 der Stahl abgerollt, geglättet und die für ein Fertigbauteil 7 notwendige Größe der Platine 1 ausgestanzt bzw. abgeschnitten. Die noch ungehärtete Platine 1 wird in einer Presse 5 bei Umgebungstemperatur mittels mechanischer Krafteinwirkung in ein weiches Vorfertigbauteil 6 umgeformt und zudem beschnitten, so dass bezüglich der Formgebung, dem Konturbeschnitt und möglichen Ausschnitten das Vorfertigbauteil 6 hinsichtlich seiner Geometrie bereits dem gehärteten Fertigbauteil 7 entspricht.In the single figure, the process sequence according to the invention for forming a blank 1 made of a tempered steel by means of a device 2 is shown schematically. From the steel delivered in the rolled-up state, a so-called coil 3, the steel is unrolled, smoothed and the size of the board 1 necessary for a prefabricated component 7 punched out or cut off by means of a tool 4. The still uncured board 1 is formed in a press 5 at ambient temperature by means of mechanical force into a soft prefabricated component 6 and also trimmed, so that with respect to the shape, the contour section and possible cutouts the precast component 6 already corresponds to the hardened finished component 7 with respect to its geometry.

Im nächsten Verfahrensschritt wird das weiche Vorfertigbauteil 6 einem Ofen 8 zugeführt und dort unter Schutzgasatmosphäre 9 austenitisiert. Die Schutzgasatmosphäre 9 ist in Fig. 1 lediglich schematisch in Form eines grau hinterlegten Kastens eingezeichnet. Mittels einer steuerbaren Transportvorrichtung 10 wird das aus dem Ofen 8 kommende, noch heiße Vorfertigbauteil 6' einem Vergütungs-/Abkühlwerkzeug 11 zugeführt und dort zum Fertigbauteil 7 gehärtet. Das Vergütungs-/Abkühlwerkzeug 11 enthält eine Presseneinrichtung 12, deren Pressenwerkzeuge Anlageflächen aufweisen, die in der Geometrie dem im ersten Verfahrensschritt hergestellten, weichen Vorfertigbauteil 6 entsprechen. Somit werden bei eingelegten Vorfertigbauteil 6' und geschlossener Presseneinrichtung 12 Kühlanlageflächen hergestellt, so dass das Vorfertigbauteil 6' funktionssicher und gesteuert zur Härtung zum Fertigbauteil 7 abgekühlt werden kann. Zur Kühlung ist das Vergütungs-/Abkühlwerkzeug 11 mit einer Kühlvorrichtung 13 gekoppelt.In the next method step, the soft prefabricated component 6 is fed to a furnace 8 and austenitized there under a protective gas atmosphere 9. The protective gas atmosphere 9 is in Fig. 1 drawn only schematically in the form of a gray box. By means of a controllable transport device 10 coming from the oven 8, still hot prefabricated component 6 'is supplied to a tempering / cooling tool 11 and cured there to the prefabricated component 7. The tempering / cooling tool 11 includes a press device 12 whose press tools have contact surfaces which correspond in geometry to the soft preform component 6 produced in the first method step. In this way, when the prefabricated component 6 'and closed press device 12 are inserted, cooling surfaces are produced, so that the prefabricated component 6' is cooled in a functionally reliable and controlled manner for hardening to the prefabricated component 7 can be. For cooling, the tempering / cooling tool 11 is coupled to a cooling device 13.

Der Bauteiltransfer vom Ausgang des Ofens 8 zum Vergütungs-/Abkühlwerkzeug 11 findet in einem Raum mit Schutzgasatmosphäre 9 statt, so dass eine Reinigung bzw. ein Entzundern des Fertigbauteils 7 vorteilhaft entfallen kann. Anschließend kann das gehärtete Fertigbauteil 7 in einem Zinkbad 14 stückverzinkt werden für einen Korrosionsschutz.The component transfer from the exit of the furnace 8 to the tempering / cooling tool 11 takes place in a space with protective gas atmosphere 9, so that cleaning or descaling of the prefabricated component 7 can advantageously be dispensed with. Subsequently, the hardened prefabricated component 7 can be galvanized in a zinc bath 14 for corrosion protection.

Insgesamt gesehen können bei diesen erfindungsgemäßen Verfahren zur Umformung einer Platine 1 aus einem Vergütungsstahl mittels der Vorrichtung 2 für das Fertigformen bzw. Fertigbeschneiden des Vorfertigbauteils 6 mittels der Presse 5 konventionelle Umformmaßnahmen eingesetzt werden, wie z. B. ein mechanisches Tiefziehverfahren. Ein Beschnitt des gehärteten Fertigbauteils 7 ist somit vorteilhaft nicht mehr notwendig, so dass dadurch aufgrund des Wegfalls dieses Beschnittvorgangs eine Reduzierung der Herstellkosten erreicht werden kann. Durch den Einsatz der Schutzgasatmosphäre beim Bauteiltransfer vom Ausgang des Ofens 8 zum Vergütungs-/Abkühlwerkzeug 11 ist eine anschließende Reinigung bzw. Entzunderung des Fertigbauteils 7 nicht notwendig, so dass damit ebenfalls die Herstellkosten gesenkt werden können. Da mit dem Vergütungs-/Abkühlwerkzeug 11 keine Umformmaßnahmen am Vorfertigbauteil 6 durchgeführt werden, sondern das Vorfertigbauteil 6 zur Abkühlung und Vergütung zum Fertigbauteil 7 nur im Vergütungs-/Abkühlwerkzeug 11 gehalten wird, kann das Vergütungs-/Abkühlwerkzeug einfacher ausgeführt werden, da keine relativ hohe Umformungsschließkraft, wie bei einer Umformpresse notwendig, erforderlich ist.Overall, in this inventive method for forming a board 1 made of a tempering steel by means of the device 2 for the finish molding or finish trimming of the precast component 6 by means of the press 5 conventional forming operations are used, such. B. a mechanical deep drawing process. A trimming of the cured prefabricated component 7 is thus advantageously no longer necessary, so that a reduction of the production costs can be achieved due to the omission of this trimming operation. The use of the inert gas atmosphere during component transfer from the outlet of the furnace 8 to the tempering / cooling tool 11 does not necessitate a subsequent cleaning or descaling of the finished component 7, so that the production costs can likewise be reduced. Since with the annealing / cooling tool 11 no forming operations on the prefabricated component 6 are performed, but the prefabricated component 6 is kept for cooling and remuneration for prefabricated component 7 only in the annealing / cooling tool 11, the tempering / cooling tool can be made easier because no relative high Umformungsschließkraft, as in a forming press necessary, is required.

Claims (7)

  1. Method for forming a plate from a heat-treatable steel, comprising the following steps:
    - in a first method step, by application of mechanical force, a soft prefabricated component (6) is formed from the still unhardened plate (1) at ambient temperature by means of shaping, contour cutting and, optionally, cut-outs which, with regard to its geometry, already corresponds to the hardened finished component (7),
    - in a second method step, the soft prefabricated component (6) is fed to a furnace (8) and austenitised in an inert gas atmosphere (9),
    - in a third method step, the austenitised prefabricated component (6') from the furnace (8) is fed in an inert gas atmosphere (9) to a heat-treating/cooling tool (11) and hardened to form the finished component (7).
  2. Method for forming a plate according to claim 1, characterised in that, in order to produce the soft prefabricated component (6) in the first method step, conventional mechanical deep-drawing methods and contour cutting methods are used, making use of at least one press (5).
  3. Method for forming a plate according to claim 1 or 2, characterised in that the transfer of the hot prefabricated component (6') from the furnace (8) to the heat-treating/cooling tool (11) is carried out by means of a controllable transport device (10).
  4. Method for forming a plate according to one of the claims 1 to 3, characterised in that the heat-treating/cooling tool (11) comprises a pressing device (12) with directly or indirectly coolable pressing tools, wherein the pressing tools have contact faces which correspond in their form to the geometry of the prefabricated component (6) made in the first method step so that with the prefabricated component (6') inserted and with the pressing device closed, cooling contact faces are created.
  5. Method for forming a plate according to one of the claims 1 to 4, characterised in that, arranged downstream as the fourth method step is galvanising (14) of the hardened finished components (7).
  6. Device for carrying out the method according to one of the claims 1 to 5 wherein a furnace (8) is arranged downstream of at least one press (5) for producing the soft prefabricated component (6), and characterised in that a controllable transport device (10) and a heat-treating/cooling tool (11) are arranged downstream of the furnace (8), wherein the heat-treating/cooling tool (11), the transport device (10) and at least the outlet of the oven (8) are accommodated in a chamber with an inert gas atmosphere (9).
  7. Device according to claim 6, characterised in that the heat-treating/cooling tool (11) comprises tools which are closable and directly or indirectly coolable and which, for the creation of cooling contact faces, correspond to the geometry of the prefabricated component (6').
EP04005921A 2003-03-28 2004-03-12 Method for forming a plate of heat treatable steel and device for carrying out thereof Expired - Lifetime EP1462192B1 (en)

Applications Claiming Priority (2)

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DE10314115 2003-03-28
DE10314115A DE10314115A1 (en) 2003-03-28 2003-03-28 Process for forming a sheet from a tempered steel and device for carrying out the process

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EP1462192B1 true EP1462192B1 (en) 2008-07-23

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AT (1) ATE401977T1 (en)
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ATE401977T1 (en) 2008-08-15
DE10314115A1 (en) 2004-10-14
EP1462192A1 (en) 2004-09-29

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