EP2182081B1 - Method for thermal treatment of a coated steel sheet body - Google Patents

Method for thermal treatment of a coated steel sheet body Download PDF

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Publication number
EP2182081B1
EP2182081B1 EP20080105691 EP08105691A EP2182081B1 EP 2182081 B1 EP2182081 B1 EP 2182081B1 EP 20080105691 EP20080105691 EP 20080105691 EP 08105691 A EP08105691 A EP 08105691A EP 2182081 B1 EP2182081 B1 EP 2182081B1
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Prior art keywords
contact
steel sheet
sheet body
temperature
contact plate
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EP20080105691
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German (de)
French (fr)
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EP2182081A1 (en
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Jürgen Kaiser
Udo Bach
Vasily Ploshikhin
Andrey Prihodovsky
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Neue Materialien Bayreuth GmbH
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Neue Materialien Bayreuth GmbH
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Priority to EP20080105691 priority Critical patent/EP2182081B1/en
Priority to PCT/DE2009/075063 priority patent/WO2010048950A1/en
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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
    • C21D1/34—Methods of heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • 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
    • C21D11/00—Process control or regulation for heat treatments

Definitions

  • the invention relates to a method for the thermal treatment of a coated sheet steel body.
  • metal sheets or sheet metal parts made of high-strength steel alloys are used, for example, in automobile bodies, which allow for the same strength a design with lower sheet thickness.
  • high strength sheets sometimes do not have sufficient deformability on cold forming. Therefore, for forming workpieces made of high-strength metal sheets forming processes at elevated temperatures, ie hot forming processes such as the so-called press hardening used.
  • the sheet metal plates to be reshaped are completely austenitized by heating to a temperature above Ac 3 (so-called austenitizing) and subsequently inserted into a pressing tool or forming tool and formed.
  • the boards are usually provided with an Al-Si protective layer.
  • roller pass furnaces are used for heating such Al-Si-coated sheet metal materials during austenitizing.
  • the coated sheet is placed in the oven and heated relatively slowly during the passage through the roller conveyor.
  • the heating rate in conventional Roller pass furnaces are limited because the Al-Si layer becomes liquid at temperatures above 650 ° C and adheres to the transport rollers in the furnace.
  • the temperature profile must be chosen so that the Al-Si layer is converted by diffusion processes into a solid layer of intermetallic phases at lower temperatures (ie ⁇ 650 ° C).
  • the residence time of the sheets within the furnace is typically about 5 to 10 minutes.
  • the temperature of the sheet material only limited control and control, since the temporal and thermal conditions can not be precisely defined and safely reproduced when passing the sheet from the furnace in a subsequent forming tool. This can lead to uncontrollable changes in the properties and thus, for example, in the forming behavior of the sheet metal material.
  • EP 1 566 462 A1 and US Pat. No. 7,165,435 B1 describe processes in which a superplastic aluminum alloy is heated between two heated plates until recrystallization. The two plates are not completely moved together, but it remains an air layer between the plates and the aluminum sheet.
  • WO 2007/013279 A1 describes a method of heating steel sheets beyond the austenite transformation point by means of contact plates and then hardening the steel sheets.
  • the object of the invention is to provide a method for the thermal treatment of a coated sheet steel body before a hot forming process, which is characterized compared to the prior art by a lower equipment cost, better temperature control and / or shorter process times.
  • At least one contact plate has a higher temperature than the steel sheet body during the contacting of the steel sheet body.
  • the at least one contact plate with a higher temperature has during the contacting a temperature above Ac3, in particular a temperature between 20 ° C and 250 ° C above Ac3, so that an austenitization of the steel sheet body takes place.
  • a sheet steel body here are both single substantially planar-shaped sheets and steel blanks, as well as three-dimensionally shaped sheet metal body made of steel and also components that are composed of several such sheets understood.
  • the temperature of the steel sheet body compensates during the contacting of the temperature of the contact plate. This leads to a thermal treatment of the steel sheet body.
  • the method according to the invention it is possible to introduce a well-defined temperature in the areas of the sheet steel body, which are in communication with the contact surfaces. As a result, the material properties which arise as a result of the thermal treatment can be adjusted very precisely and homogeneously.
  • the method according to the invention can be used variably.
  • the temperature which the contact plate has or on which the steel sheet body is brought, as well as the period of time for which the contact between contact plates and steel sheet body, can be chosen almost arbitrarily. It is thus possible to variably adapt the method according to the invention to the desired parameters of the thermal treatment and to the material to be treated.
  • the contact between sheet steel body and contact plates may be formed such that the contact plates and the sheet steel body touch directly. However, it may also be an intermediate layer, such as a contact agent, which improves the temperature balance between the contact plate and sheet steel body, be present.
  • the area associated with the contact plates surface portions can both extend over large parts of the sheet steel body or completely cover this and form only small, localized areas of the sheet steel body. If only locally limited areas are connected to the contact plates, a local thermal treatment of the steel sheet body can be carried out.
  • An apparatus for carrying out the method according to the invention comprises a first flat contact plate, a second flat contact plate, which is arranged substantially parallel to the first contact plate, at least one heat source, which communicates with at least one of the contact plates, as well as a closing device for varying the Distance between the mutually parallel contact plates.
  • the contact plates can both be made of the same material as well as of different materials.
  • contact plates that are heated made of a metallic material, such as steel.
  • Contact plates that are not heated may preferably be made of both metallic and non-metallic materials. In a particularly advantageous manner, contact plates that are not heated, made of an insulating material. This has the advantage that the heat loss is reduced.
  • the contact plates may have an insulating layer. Also, the heat loss can be reduced thereby.
  • Fig. 1 shows a schematic sectional view of an embodiment of the method according to the invention.
  • the steel sheet body 1 has been brought by the displacement of the first contact plate 2 by means of the closing device 11 in the direction 4 with the first contact plate 2 in contact.
  • a first surface portion 6 of the sheet steel body 1 is in communication with the first contact plate 2.
  • the first surface section 6 lies on the upper side of the sheet metal and the second surface section 7 is located on the underside of the sheet metal.
  • first surface portion 6 and the second surface portion 7 correspond to a portion of the top or bottom of the flat sheet steel body 1.
  • first surface portion 6 and the second surface portion 7 of the entire bottom or the entire top of a flat sheet steel body 1 correspond.
  • the contact plates 2, 3 are formed flat in accordance with the contour of the surface sections 6, 7 of the steel sheet body 1 and are arranged running parallel to one another in the state of contacting with the metal body 1.
  • the contacting can be designed such that the first contact plate 2 and the second contact plate 3 are brought into contact with the steel sheet body 1 simultaneously. However, it is also possible first to bring a contact plate 2 into contact with the steel sheet body 1 and to add a second contact plate 3 only later in time.
  • the second contact plate 3 is or was brought by an energy source 5 to a relative to the steel sheet body 1 elevated temperature.
  • Energy source 5 is understood below to mean any device that can be used to heat objects.
  • the contact plates 2, 3 are arranged running parallel to one another.
  • the second contact plate 3 has an insulation layer 8. By this insulating layer 8, the heat or cooling loss can be reduced.
  • the temperature of the steel sheet body 1 can be kept constant. However, it is also possible to vary the temperature of the steel sheet body 1 in the course of contacting by the defined change in the temperatures of the contact plates 2.3. Thus, a very variable adaptation of the temperature-time curve is possible.
  • the temperature profile along a contact plate 2, 3 can be designed such that an almost constant temperature is established over the entire contact plate 2, 3.
  • the contact plate 2, 3 can also be heated or cooled in such a way that regions with different temperatures form within the contact plate 2, 3.
  • the first surface portion 6 brought into contact with the contact plates 2, 3 and the second surface portion 7 of the sheet steel body 1 may be the same size. However, they can also have different sizes (not shown).
  • a temperature control device 9 and a temperature control device 10 may be attached on the contact plate 2. Furthermore, a temperature sensor element (not shown) may also be attached. This allows the measurement of the temperature of the steel sheet body 1 and / or the contact plates 2.3. The temperature measured in this way can serve, for example, as an input variable for the temperature control device 9 and / or the temperature control device 10, which controls and / or controls or controls the temperature-time profile of the thermal treatment.
  • the method can also be configured such that a plurality of steel sheet bodies 1 are simultaneously brought into contact with at least one first and / or one at least one second contact plate simultaneously.
  • Fig. 2 shows a schematic sectional view of another embodiment of the method according to the invention.
  • the steel sheet body 1 was brought by moving the first contact plate 2 with this and a second contact plate 3 in contact.
  • the displacement of the two contact plates 2, 3 arranged parallel to one another takes place through the closing device 11.
  • the first contact plate 2 is or has been brought by an energy source 5 to an elevated temperature relative to the steel sheet body.
  • the second contact plate 3 is or was brought by a further energy source 5 to a relative to the steel sheet body elevated temperature.
  • the first contact plate 2 and the second contact plate 3 can be brought by the power sources 5 both to the same temperature and to different temperatures.
  • Fig. 3a shows a schematic sectional view of a first process step to a temperature of the contact plates.
  • the first contact plate 2 and the second contact plate 3 are brought into mutual contact with each other before contacting with the steel sheet body. Subsequently, the second contact plate 3 is heated by the power source 5. The temperature then transfers to the first contact plate 2 contacting the second contact plate 3.
  • Fig. 3b shows a schematic sectional view of a second method step to an application of the contact plates, which conform to the in Fig. 3a followed by the process step.
  • the first contact plate 2 and the second contact plate 3 are separated from each other.
  • the sheet steel body 1 is inserted between the separate contact plates 2, 3.
  • Fig. 3c shows a schematic sectional view of a third method step for an application of the contact plates 2 and 3, which conform to the in Fig. 3b followed by the process step.
  • the first contact plate 2 and the second contact plate 3 were brought into contact with the steel sheet body 1 by closing the closing device 11.
  • both the first contact plate 2 and the second contact plate 2 have a relation to the steel sheet body 1 increased temperature.
  • the at least one cooling plate with which the sheet steel body 1 can be brought into contact after heating in a subsequent process step.
  • this may have similar dimensions as the contact plates 2.3.
  • there may be two cooling plates which are brought into contact with the sheet steel body in a similar manner as the contact plates 2, 3.
  • the at least one cooling plate is cooled.
  • it may, for example, have cooling channels.
  • a flat-formed sheet metal blank made of a steel of the composition 22MnB5 (trade name MBW-K1500AS of ThyssenKrupp) with an AlSi10 coating fixed as a sheet steel body 1 between a first contact plate 2 and a second contact plate 3.
  • the temperature of the contact plates was 1020 ° C.
  • the sheet metal blank was held between the contact plates for a contact time of 20 seconds.
  • the contact time is understood as meaning the time span in which the sheet metal blank is contacted by the two contact plates 2 and 3.
  • the metal sheet was above the A c3 temperature for a period of about 12 seconds.
  • the sheet metal blank had a compact, adherent anticorrosive coating of AlFeSi-intermetallic solid phases.

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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 Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Articles (AREA)

Description

Die Erfindung betrifft ein Verfahren zur thermischen Behandlung eines beschichteten Stahlblechkörpers.The invention relates to a method for the thermal treatment of a coated sheet steel body.

Zur Gewichtsreduzierung werden beispielsweise in Automobilkarosserien Metallbleche bzw. Blechformteile aus hochfesten Stahllegierungen eingesetzt, die bei gleicher Festigkeit eine Auslegung mit geringerer Blechdicke ermöglichen. Hochfeste Bleche weisen jedoch bisweilen bei einer Kaltumformung kein ausreichendes Formänderungsvermögen auf. Daher werden zur Umformung von Werkstücken aus hochfesten Metallblechen Umformprozesse bei erhöhten Temperaturen, d.h. Warmumformprozesse wie beispielsweise das sogenannte Presshärten, eingesetzt. Hierbei werden die umzuformenden Blechplatinen durch Erwärmung auf eine Temperatur oberhalb Ac3 vollständig austenitisiert (sog. Austenitisierung) und anschließend in ein Presswerkzeug bzw. Umformwerkzeug eingelegt und umgeformt.For weight reduction, metal sheets or sheet metal parts made of high-strength steel alloys are used, for example, in automobile bodies, which allow for the same strength a design with lower sheet thickness. However, high strength sheets sometimes do not have sufficient deformability on cold forming. Therefore, for forming workpieces made of high-strength metal sheets forming processes at elevated temperatures, ie hot forming processes such as the so-called press hardening used. In this case, the sheet metal plates to be reshaped are completely austenitized by heating to a temperature above Ac 3 (so-called austenitizing) and subsequently inserted into a pressing tool or forming tool and formed.

Zum Schutz vor Korrosion bzw. vor Verzunderung und/oder Oxidation während der Wärmebehandlung werden die Platinen in der Regel mit einer Al-Si-Schutzschicht versehen.To protect against corrosion or against scaling and / or oxidation during the heat treatment, the boards are usually provided with an Al-Si protective layer.

In der industriellen Produktionspraxis kommen zur Erwärmung derartiger Al-Si-beschichteter Blechwerkstoffe während des Austenitisierens Rollendurchlauföfen zum Einsatz. Dabei wird das beschichtete Blech in den Ofen gegeben und während des Durchlaufs durch den Rollendurchlaufofen relativ langsam aufgeheizt. Die Aufheizgeschwindigkeit in konventionellen Rollendurchlauföfen ist begrenzt, da die Al-Si-Schicht bei Temperaturen von über 650 °C flüssig wird und an den Transportrollen im Ofen anhaftet. Um dies zu vermeiden, muss das Temperaturprofil so gewählt werden, dass die Al-Si-Schicht bei niedrigeren Temperaturen (d.h. <650 °C) durch Diffusionsprozesse in eine feste Schicht aus intermetallischen Phasen umgewandelt wird. Dadurch beträgt die Verweildauer der Bleche innerhalb des Ofens typischerweise ca. 5 bis 10 Minuten.In industrial production practice, roller pass furnaces are used for heating such Al-Si-coated sheet metal materials during austenitizing. The coated sheet is placed in the oven and heated relatively slowly during the passage through the roller conveyor. The heating rate in conventional Roller pass furnaces are limited because the Al-Si layer becomes liquid at temperatures above 650 ° C and adheres to the transport rollers in the furnace. To avoid this, the temperature profile must be chosen so that the Al-Si layer is converted by diffusion processes into a solid layer of intermetallic phases at lower temperatures (ie <650 ° C). As a result, the residence time of the sheets within the furnace is typically about 5 to 10 minutes.

Nachteilig an dieser Vorgehensweise sind zum einen die hohen Kosten und der hohe apparative Aufwand der bis zu 55 Meter langen Rollenherdöfen und zum anderen die relativ lange Verweildauer innerhalb der Öfen.Disadvantages of this procedure are, on the one hand, the high costs and the high expenditure on equipment of the up to 55 meter long roller hearth furnaces and, on the other hand, the relatively long residence time within the furnaces.

Auch lässt sich bei diesem Verfahren die Temperatur des Blechwerkstoffs nur bedingt steuern und kontrollieren, da die zeitlichen und thermischen Rahmenbedingungen etwa bei der Übergabe des Blechs vom Ofen in ein nachfolgendes Umformwerkzeug nicht genau definiert und sicher reproduziert werden können. Dies kann zu unkontrollierbaren Änderungen in den Eigenschaften und damit beispielsweise im Umformverhalten des Blechwerkstoffs führen.Also, in this method, the temperature of the sheet material only limited control and control, since the temporal and thermal conditions can not be precisely defined and safely reproduced when passing the sheet from the furnace in a subsequent forming tool. This can lead to uncontrollable changes in the properties and thus, for example, in the forming behavior of the sheet metal material.

EP 1 566 462 A1 und US 7,165,435 B1 beschreiben Verfahren, in denen eine superplastische Aluminiumlegierung zwischen zwei erwärmten Platten bis zur Rekristallisation erhitzt wird. Dabei werden die beiden Platten nicht vollständig zusammengefahren, sondern es verbleibt eine Luftschicht zwischen den Platten und dem Aluminiumblech. EP 1 566 462 A1 and US Pat. No. 7,165,435 B1 describe processes in which a superplastic aluminum alloy is heated between two heated plates until recrystallization. The two plates are not completely moved together, but it remains an air layer between the plates and the aluminum sheet.

WO 2007/013279 A1 beschreibt ein Verfahren zum Erwärmen von Stahlblechen über den Austenit-Umwandlungspunkt hinaus mittels Kontaktplatten und anschließenden Härten der Stahlbleche. WO 2007/013279 A1 describes a method of heating steel sheets beyond the austenite transformation point by means of contact plates and then hardening the steel sheets.

Aufgabe der Erfindung ist es, ein Verfahren zur thermischen Behandlung eines beschichteten Stahlblechkörpers vor einem Warmumformprozess bereitzustellen, welche sich im Vergleich zum Stand der Technik durch einen geringeren apparativen Aufwand, bessere Temperaturkontrolle und/oder verkürzte Prozesszeiten auszeichnet.The object of the invention is to provide a method for the thermal treatment of a coated sheet steel body before a hot forming process, which is characterized compared to the prior art by a lower equipment cost, better temperature control and / or shorter process times.

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 realisiert. Vorteilhafte Ausführungsformen des Verfahrens werden in den Unteransprüchen 2 - 9 realisiert.
Bei dem erfindungsgemäßen Verfahren zur thermischen Behandlung mindestens eines beschichteten, insbesondere Al-Si-beschichteten, Stahlblechkörpers vor einem Warmumformprozess wird der Stahlblechkörper in seiner Lage fixiert und mindestens eine erste Kontaktplatte mit mindestens einem ersten Flächenabschnitt des Stahlblechkörpers in Kontakt gebracht, mindestens eine zweite Kontaktplatte mit mindestens einem zweiten Flächenabschnitt des Stahlblechkörpers in Kontakt gebracht. Die Kontaktplatten sind flächig im wesentlichen oder vollständig entsprechend der Kontur der Flächenabschnitte des Stahlblechkörpers ausgebildet und im Zustand der Kontaktierung mit dem Stahlblechkörper im wesentlichen parallel zueinander verlaufend angeordnet. Mindestens eine Kontaktplatte besitzt während der Kontaktierung des Stahlblechkörpers eine gegenüber dem Stahlblechkörper höhere Temperatur. Die mindestens eine Kontaktplatte mit höherer Temperatur besitzt während der Kontaktierung eine Temperatur oberhalb von Ac3, insbesondere eine Temperatur zwischen 20°C und 250°C oberhalb von Ac3, sodass eine Austenitisierung des Stahlblechkörpers erfolgt.This object is achieved by a method having the features of patent claim 1. Advantageous embodiments of the method are realized in the subclaims 2-9.
In the method according to the invention for the thermal treatment of at least one coated, in particular Al-Si-coated, steel sheet body prior to a hot forming process, the steel sheet body is fixed in position and brought at least a first contact plate with at least a first surface portion of the steel sheet body in contact, at least one second contact plate with at least a second surface portion of the sheet steel body brought into contact. The contact plates are flat substantially or completely formed according to the contour of the surface portions of the sheet steel body and arranged in the state of contacting with the sheet steel body substantially parallel to each other. At least one contact plate has a higher temperature than the steel sheet body during the contacting of the steel sheet body. The at least one contact plate with a higher temperature has during the contacting a temperature above Ac3, in particular a temperature between 20 ° C and 250 ° C above Ac3, so that an austenitization of the steel sheet body takes place.

Unter einem Stahlblechkörper werden hierbei sowohl einzelne im wesentlichen planar geformte Bleche und Blechplatinen aus Stahl, als auch dreidimensional geformte Blechformkörper aus Stahl und auch Bauteile, die aus mehreren derartiger Bleche aufgebaut sind, verstanden.Under a sheet steel body here are both single substantially planar-shaped sheets and steel blanks, as well as three-dimensionally shaped sheet metal body made of steel and also components that are composed of several such sheets understood.

Durch den Kontakt der Kontaktplatten mit dem beschichten Stahlblechkörper wird eine schnelle Aufheizung erreicht. Bei einem Al-Si-beschichteten Stahlblechkörper wird eine guthaftende Schutzschicht innerhalb kurzer Prozesszeiten erzeugt.By the contact of the contact plates with the coated sheet steel body rapid heating is achieved. In an Al-Si-coated sheet steel body, a good-adhesion protective layer is produced within a short process time.

Die Temperatur des Stahlblechkörpers gleicht während der Kontaktierung die Temperatur der Kontaktplatte aus. Dies führt zu einer thermischen Behandlung des Stahlblechkörpers. Durch das erfindungsgemäße Verfahren ist es möglich, eine genau definierte Temperatur in die Bereiche des Stahlblechkörpers, die mit den Kontaktflächen in Verbindung stehen, einzubringen. Dadurch können die sich durch die thermische Behandlung einstellenden Werkstoffeigenschaften sehr exakt und homogen eingestellt werden.The temperature of the steel sheet body compensates during the contacting of the temperature of the contact plate. This leads to a thermal treatment of the steel sheet body. By the method according to the invention it is possible to introduce a well-defined temperature in the areas of the sheet steel body, which are in communication with the contact surfaces. As a result, the material properties which arise as a result of the thermal treatment can be adjusted very precisely and homogeneously.

Das erfindungsgemäße Verfahren ist variabel einsetzbar. Insbesondere können die Temperatur, die die Kontaktplatte besitzt bzw. auf die der Stahlblechkörper gebracht wird, sowie die Zeitspanne, für die die Kontaktierung zwischen Kontaktplatten und Stahlblechkörper besteht, nahezu beliebig gewählt werden. So ist es möglich, das erfindungsgemäße Verfahren variabel an die gewünschten Parameter der thermischen Behandlung sowie an den zu behandelnden Werkstoff anzupassen.The method according to the invention can be used variably. In particular, the temperature which the contact plate has or on which the steel sheet body is brought, as well as the period of time for which the contact between contact plates and steel sheet body, can be chosen almost arbitrarily. It is thus possible to variably adapt the method according to the invention to the desired parameters of the thermal treatment and to the material to be treated.

Der Kontakt zwischen Stahlblechkörper und Kontaktplatten kann derart ausgebildet sein, dass sich die Kontaktplatten und der Stahlblechkörper direkt berühren. Es kann allerdings auch eine Zwischenschicht, wie etwa ein Kontaktmittel, das den Temperaturausgleich zwischen Kontaktplatte und Stahlblechkörper verbessert, vorhanden sein.The contact between sheet steel body and contact plates may be formed such that the contact plates and the sheet steel body touch directly. However, it may also be an intermediate layer, such as a contact agent, which improves the temperature balance between the contact plate and sheet steel body, be present.

Es kann sowohl nur ein Stahlblechkörper als auch mehrere Stahlblechkörper gleichzeitig zwischen den Kontaktplatten erfasst werden.It can be detected both between the contact plates at the same time only a sheet steel body and several steel sheet body.

Die mit den Kontaktplatten in Verbindung stehenden Flächenabschnitte können sich sowohl über weite Teile des Stahlblechkörpers erstrecken bzw. diesen vollkommen bedecken als auch nur kleine, lokal begrenzte Bereiche des Stahlblechkörpers bilden. Stehen nur lokal begrenzte Bereiche mit den Kontaktplatten in Verbindung kann dadurch eine lokale thermische Behandlung des Stahlblechkörpers durchgeführt werden.The area associated with the contact plates surface portions can both extend over large parts of the sheet steel body or completely cover this and form only small, localized areas of the sheet steel body. If only locally limited areas are connected to the contact plates, a local thermal treatment of the steel sheet body can be carried out.

Weitere vorteilhafte Ausgestaltungen des Verfahrens können folgende zusätzliche Merkmale aufweisen:

  • Der Stahlblechkörper kann für eine Zeitspanne zwischen 5 s und 90 s, vorzugsweise für eine Zeitspanne zwischen 10 s und 30 s, eine Temperatur oberhalb von Ac3 besitzen.
  • Der Stahlblechkörper kann für eine Zeitspanne zwischen 10 s und 120 s, vorzugsweise für eine Zeitspanne zwischen 15 s und 40 s, die beiden Kontaktplatten kontaktieren.
  • Die Kontaktplatten können auf den Stahlblechkörper gepresst werden. Dies hat den Vorteil, dass ein Kontakt zwischen Kontaktplatten und Metallkörper besonders sicher gewährleistet wird. Darüber hinaus ist dadurch eine Minimierung der Verzüge besonders wirkungsvoll möglich.
  • Die Temperatur der mindestens einen Kontaktplatte mit höherer Temperatur kann vor und/oder während der Kontaktierung des Stahlblechkörpers mit den Kontaktplatten durch eine Temperaturregeleinrichtung geregelt werden.
  • Die Temperatur der mindestens einen Kontaktplatte mit höherer Temperatur kann vor und/oder während der Kontaktierung des Stahlblechkörpers mit den Kontaktplatten durch eine Temperaturkontrolleinrichtung kontrolliert werden.
  • Die Temperatur kann in mindestens einem Teilbereich der mindestens einen Kontaktplatte mit höherer Temperatur vor und/oder während der Kontaktierung des Stahlblechkörpers mit den Kontaktplatten durch eine Temperaturregeleinrichtung geregelt werden.
  • Es kann in einem weiteren Verfahrensschritt mindestens eine Kontaktplatte entfernt werden. Dadurch wird es möglich, die Ausbildung des Temperaturprofils des Metallkörpers durch das Entfernen einer oder mehrerer Kontaktplatten zu beeinflussen.
  • Der Stahlblechkörper kann in einem unmittelbar anschließenden Arbeitsschritt umgeformt werden, wobei der mindestens eine erste Flächenabschnitt und zweite Flächenabschnitt im oder in der Nähe des umzuformenden Bereichs liegen.
  • Der Stahlblechkörper kann nach dem Erwärmen in einem anschließenden Verfahrensschritt mit mindestens einer Abkühlplatte in Kontakt gebracht wird und wobei die Abkühlplatte eine gegenüber dem Stahlblechkörper niedrigere Temperatur, insbesondere eine Temperatur zwischen 400°C und 600°C, besitzt. Hierbei kann die Abkühlplatte auch gekühlt werden. Durch die aktive Kühlung der Abkühlplatte kann die Temperatur des Stahlblechkörpers exakt gesteuert werden. Insbesondere kann dadurch die Abkühlgeschwindigkeit des Stahlblechkörpers genau eingestellt werden.
Further advantageous embodiments of the method may have the following additional features:
  • The steel sheet body may have a temperature above A c3 for a period between 5 s and 90 s, preferably for a period between 10 s and 30 s.
  • The sheet steel body can contact the two contact plates for a period between 10 s and 120 s, preferably for a period between 15 s and 40 s.
  • The contact plates can be pressed onto the sheet steel body. This has the advantage that a contact between contact plates and metal body is ensured particularly secure. In addition, thereby minimizing the delays is particularly effective possible.
  • The temperature of the at least one contact plate with a higher temperature can be regulated before and / or during the contacting of the sheet steel body with the contact plates by a temperature control device.
  • The temperature of the at least one contact plate with a higher temperature can be controlled before and / or during the contacting of the sheet steel body with the contact plates by a temperature control device.
  • The temperature can be regulated in at least a portion of the at least one contact plate with a higher temperature before and / or during the contacting of the sheet steel body with the contact plates by a temperature control device.
  • It can be removed in a further process step, at least one contact plate. This makes it possible to influence the formation of the temperature profile of the metal body by removing one or more contact plates.
  • The steel sheet body can be formed in an immediately subsequent step, wherein the at least one first surface portion and second surface portion are in or near the area to be formed.
  • The steel sheet body can after heating in a subsequent process step is brought into contact with at least one cooling plate and wherein the cooling plate has a relation to the steel sheet body lower temperature, in particular a temperature between 400 ° C and 600 ° C. In this case, the cooling plate can also be cooled. By actively cooling the cooling plate, the temperature of the sheet steel body can be controlled exactly. In particular, this allows the cooling rate of the steel sheet body to be set accurately.

Eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens weist eine erste flach ausgebildete Kontaktplatte, ein zweite flach ausgebildete Kontaktplatte, welche im Wesentlichen parallel zur ersten Kontaktplatte angeordnet ist, mindestens eine Wärmequelle, welche mit mindestens einer der Kontaktplatten in Verbindung steht, sowie eine Schließvorrichtung zur Variation des Abstandes der parallel zueinander angeordneten Kontaktplatten auf.An apparatus for carrying out the method according to the invention comprises a first flat contact plate, a second flat contact plate, which is arranged substantially parallel to the first contact plate, at least one heat source, which communicates with at least one of the contact plates, as well as a closing device for varying the Distance between the mutually parallel contact plates.

Vorteilhafte Ausgestaltungen der Vorrichtung können folgende zusätzliche Merkmale aufweisen:

  • Die Vorrichtung kann eine Temperaturregeleinrichtung und/oder eine Temperaturkontrolleinrichtung aufweisen.
  • Die Kontaktplatten können aus einem Metall und/oder aus Keramik bestehen.
  • Die mindestens eine Wärmequelle kann in einer Kontaktplatte integriert sein.
  • Die mindestens eine Wärmequelle kann als induktive oder konduktive Wärmequelle ausgebildet sein.
Advantageous embodiments of the device may have the following additional features:
  • The device may have a temperature control device and / or a temperature control device.
  • The contact plates may be made of a metal and / or ceramic.
  • The at least one heat source can be integrated in a contact plate.
  • The at least one heat source may be formed as an inductive or conductive heat source.

Die Kontaktplatten können sowohl alle aus dem gleichen Werkstoff als auch aus unterschiedlichen Werkstoffen hergestellt sein. Vorzugsweise bestehen Kontaktplatten, die erwärmt werden, aus einem metallischen Werkstoff, beispielsweise aus Stahl.The contact plates can both be made of the same material as well as of different materials. Preferably, contact plates that are heated, made of a metallic material, such as steel.

Kontaktplatten, die nicht erwärmt werden, können bevorzugt sowohl aus metallischen als auch nicht-metallischen Werkstoffen hergestellt werden. In besonders vorteilhafter Weise werden Kontaktplatten, die nicht erwärmt werden, aus einem Isolationsmaterial hergestellt. Dies hat den Vorteil, dass der Wärmeverlust verringert wird.Contact plates that are not heated may preferably be made of both metallic and non-metallic materials. In a particularly advantageous manner, contact plates that are not heated, made of an insulating material. This has the advantage that the heat loss is reduced.

Die Kontaktplatten können eine Isolationsschicht aufweisen. Auch dadurch kann der Wärmeverlust verringert werden.The contact plates may have an insulating layer. Also, the heat loss can be reduced thereby.

Die Erfindung ist anhand von Ausführungsbeispielen in den Zeichnungsfiguren weiter erläutert. Es zeigen:

Fig. 1
eine schematische Schnittdarstellung einer Ausführungsform des erfindungsgemäßen Verfahrens,
Fig. 2
eine schematische Schnittdarstellung einer weiteren Ausführungsform des erfindungsgemäßen Verfahrens,
Fig. 3a
eine schematische Schnittdarstellung eines ersten Verfahrensschrittes zu einer Temperierung der Kontaktplatten,
Fig. 3b
eine schematische Schnittdarstellung eines zweiten Verfahrensschrittes zu einer Anwendung der Kontaktplatten,
Fig. 3c
eine schematische Schnittdarstellung eines dritten Verfahrensschrittes zu einer Anwendung der Kontaktplatten.
The invention is further explained by means of embodiments in the drawing figures. Show it:
Fig. 1
a schematic sectional view of an embodiment of the method according to the invention,
Fig. 2
a schematic sectional view of another embodiment of the method according to the invention,
Fig. 3a
1 is a schematic sectional view of a first method step for tempering the contact plates;
Fig. 3b
FIG. 2 is a schematic sectional view of a second method step for using the contact plates. FIG.
Fig. 3c
a schematic sectional view of a third method step for an application of the contact plates.

Fig. 1 zeigt in schematischer Schnittdarstellung eine Ausführungsform des erfindungsgemäßen Verfahrens. Der Stahlblechkörper 1 ist durch das Verschieben der ersten Kontaktplatte 2 mit Hilfe der Schließvorrichtung 11 in Richtung 4 mit der ersten Kontaktplatte 2 in Kontakt gebracht worden. Ein erster Flächenabschnitt 6 des Stahlblechkörpers 1 steht mit der ersten Kontaktplatte 2 in Verbindung. Der erste Flächenabschnitt 6 liegt auf der Blechoberseite und der zweite Flächenabschnitt 7 befindet sich auf der Blechunterseite. Fig. 1 shows a schematic sectional view of an embodiment of the method according to the invention. The steel sheet body 1 has been brought by the displacement of the first contact plate 2 by means of the closing device 11 in the direction 4 with the first contact plate 2 in contact. A first surface portion 6 of the sheet steel body 1 is in communication with the first contact plate 2. The first surface section 6 lies on the upper side of the sheet metal and the second surface section 7 is located on the underside of the sheet metal.

In der in Fig. 1 dargestellten Ausführungsform entsprechen der erste Flächenabschnitt 6 und der zweite Flächenabschnitt 7 einen Teilbereich der Ober- bzw. Unterseite des flach ausgebildeten Stahlblechkörpers 1. Es sind jedoch auch Ausführungsformen möglich, in denen der erste Flächenabschnitt 6 bzw. der zweite Flächenabschnitt 7 der gesamten Unterseite bzw. der gesamten Oberseite eines flach ausgebildeten Stahlblechkörpers 1 entsprechen.In the in Fig. 1 illustrated embodiment, the first surface portion 6 and the second surface portion 7 correspond to a portion of the top or bottom of the flat sheet steel body 1. However, embodiments are also possible in which the first surface portion 6 and the second surface portion 7 of the entire bottom or the entire top of a flat sheet steel body 1 correspond.

Außerdem ist der Stahlblechkörper 1 mit der zweiten Kontaktplatte 3 in Kontakt gebracht worden. Ein zweiter Flächenabschnitt 7 steht mit der zweiten Kontaktplatte 3 in Verbindung.In addition, the steel sheet body 1 has been brought into contact with the second contact plate 3. A second surface portion 7 is in communication with the second contact plate 3.

Dabei sind die Kontaktplatten 2,3 flächig entsprechend der Kontur der Flächenabschnitte 6,7 des Stahlblechkörpers 1 ausgebildet und im Zustand der Kontaktierung mit dem Metallkörper 1 parallel zueinander verlaufend angeordnet.In this case, the contact plates 2, 3 are formed flat in accordance with the contour of the surface sections 6, 7 of the steel sheet body 1 and are arranged running parallel to one another in the state of contacting with the metal body 1.

In der Ausführungsform nach Fig. 1 wird durch die Schließvorrichtung 11 die Kontaktplatte 2 in ihrem Abstand zur Kontaktplatte 3 variiert. Dadurch ist das Auseinander- und Zusammenfahren der Kontaktplatten 2,3 und damit die Kontaktierung eines zwischen diesen eingebrachten Stahlblechkörpers 1 möglich.In the embodiment according to Fig. 1 is varied by the closing device 11, the contact plate 2 in their distance from the contact plate 3. As a result, the moving apart and moving together of the contact plates 2.3 and thus the contacting of a steel sheet body 1 introduced between these is possible.

Zur Kontaktierung der Kontaktplatten 2,3 mit dem Stahlblechkörper 1 sind jedoch auch anders aufgebaute Schließvorrichtungen geeignet. So kann entweder nur eine Kontaktplatte oder mehrere Kontaktplatten verschiebbar sein.For contacting the contact plates 2,3 with the sheet steel body 1 but also differently constructed locking devices are suitable. Thus, either only one contact plate or several contact plates can be displaced.

Die Kontaktierung kann derart gestaltet sein, dass die erste Kontaktplatte 2 und die zweite Kontaktplatte 3 simultan mit dem Stahlblechkörper 1 in Kontakt gebracht werden. Es kann aber auch zunächst eine Kontaktplatte 2 mit dem Stahlblechkörper 1 in Kontakt gebracht werden und erst zeitlich später eine zweite Kontaktplatte 3 hinzukommen.The contacting can be designed such that the first contact plate 2 and the second contact plate 3 are brought into contact with the steel sheet body 1 simultaneously. However, it is also possible first to bring a contact plate 2 into contact with the steel sheet body 1 and to add a second contact plate 3 only later in time.

Die zweite Kontaktplatte 3 wird bzw. wurde durch eine Energiequelle 5 auf eine gegenüber dem Stahlblechkörper 1 erhöhte Temperatur gebracht. Unter Energiequelle 5 wird im weiteren jede Einrichtung verstanden, die zur Erwärmung von Gegenständen eingesetzt werden kann.The second contact plate 3 is or was brought by an energy source 5 to a relative to the steel sheet body 1 elevated temperature. Energy source 5 is understood below to mean any device that can be used to heat objects.

Die Kontaktplatten 2,3 sind dabei parallel zueinander verlaufend angeordnet. Die zweite Kontaktplatte 3 weist eine Isolationsschicht 8 auf. Durch diese Isolationsschicht 8 kann der Wärme- bzw. Kühlverlust verringert werden.The contact plates 2, 3 are arranged running parallel to one another. The second contact plate 3 has an insulation layer 8. By this insulating layer 8, the heat or cooling loss can be reduced.

Während der Kontaktierung der Kontaktplatten 2,3 mit dem Stahlblechkörper 1 kann die Temperatur des Stahlblechkörpers 1 konstant gehalten werden. Es ist jedoch auch möglich die Temperatur des Stahlblechkörpers 1 im Verlauf der Kontaktierung durch die definierte Änderung der Temperaturen der Kontaktplatten 2,3 zu variieren. Somit ist eine sehr variable Anpassung des Temperatur-Zeit-Verlaufs möglich.During the contacting of the contact plates 2, 3 with the steel sheet body 1, the temperature of the steel sheet body 1 can be kept constant. However, it is also possible to vary the temperature of the steel sheet body 1 in the course of contacting by the defined change in the temperatures of the contact plates 2.3. Thus, a very variable adaptation of the temperature-time curve is possible.

Der Temperaturverlauf entlang einer Kontaktplatte 2,3 kann derart ausgebildet sein, dass sich über die gesamte Kontaktplatte 2,3 eine nahezu konstante Temperatur einstellt. Die Kontaktplatte 2,3 kann jedoch auch derart erwärmt oder gekühlt werden, dass sich innerhalb der Kontaktplatte 2,3 Bereiche mit unterschiedlichen Temperaturen bilden. Somit wird es möglich in unterschiedlichen Bereichen des Stahlblechkörper 1 unterschiedliche Temperatur-Zeit-Verläufe zu verwirklichen und damit eine selektive und individuell an den Anwendungszweck angepasste Temperaturbeaufschlagung einzelner Teilbereiche der Flächenabschnitte 6 und 7 des Stahlblechkörpers 1 zu erzielen.The temperature profile along a contact plate 2, 3 can be designed such that an almost constant temperature is established over the entire contact plate 2, 3. However, the contact plate 2, 3 can also be heated or cooled in such a way that regions with different temperatures form within the contact plate 2, 3. Thus, it becomes possible to realize different temperature-time profiles in different areas of the steel sheet body 1 and thus to achieve a selective and individually adapted to the application temperature application of individual portions of the surface portions 6 and 7 of the sheet steel body 1.

Der mit den Kontaktplatten 2,3 in Kontakt gebrachten erste Flächenabschnitt 6 und zweite Flächenabschnitt 7 des Stahlblechkörpers 1 können die gleiche Größe besitzen. Sie können jedoch auch unterschiedliche Größen besitzen (nicht abgebildet).The first surface portion 6 brought into contact with the contact plates 2, 3 and the second surface portion 7 of the sheet steel body 1 may be the same size. However, they can also have different sizes (not shown).

An der Kontaktplatte 2 ist eine Temperaturregeleinrichtung 9 und eine Temperaturkontrolleinrichtung 10 angebracht sein. Ferner kann auch ein Temperatursensorelement (nicht abgebildet) angebracht sein. Dies ermöglicht die Messung der Temperatur des Stahlblechkörpers 1 und/oder der Kontaktplatten 2,3. Die auf diese Weise gemessene Temperatur kann beispielsweise als Eingangsgröße für die Temperaturregeleinrichtung 9 und/oder die Temperaturkontrolleinrichtung 10 dienen, die den Temperatur-Zeit-Verlauf der thermischen Behandlung steuert und/oder regelt bzw. kontrolliert.On the contact plate 2, a temperature control device 9 and a temperature control device 10 may be attached. Furthermore, a temperature sensor element (not shown) may also be attached. This allows the measurement of the temperature of the steel sheet body 1 and / or the contact plates 2.3. The temperature measured in this way can serve, for example, as an input variable for the temperature control device 9 and / or the temperature control device 10, which controls and / or controls or controls the temperature-time profile of the thermal treatment.

Das Verfahren kann auch derart ausgestaltet sein, dass gleichzeitig mehrere Stahlblechkörper 1 gleichzeitig im Kontakt mit mindestens einer ersten und/oder einer mindestens einer zweiten Kontaktplatte in Kontakt gebracht werden.The method can also be configured such that a plurality of steel sheet bodies 1 are simultaneously brought into contact with at least one first and / or one at least one second contact plate simultaneously.

Fig. 2 zeigt eine schematische Schnittdarstellung einer weiteren Ausführungsform des erfindungsgemäßen Verfahrens. Der Stahlblechkörper 1 wurde durch Verschieben der ersten Kontaktplatte 2 mit dieser sowie einer zweiten Kontaktplatte 3 in Kontakt gebracht. Dabei erfolgt die Verschiebung der beiden parallel zueinander angeordneten Kontaktplatten 2,3 durch die Schließvorrichtung 11. Die erste Kontaktplatte 2 wird bzw. wurde durch eine Energiequelle 5 auf eine gegenüber dem Stahlblechkörper erhöhte Temperatur gebracht. Die zweite Kontaktplatte 3 wird bzw. wurde durch eine weitere Energiequelle 5 auf eine gegenüber dem Stahlblechkörper erhöhte Temperatur gebracht. Dabei können die erste Kontaktplatte 2 und die zweite Kontaktplatte 3 durch die Energiequellen 5 sowohl auf die gleiche Temperatur als auch auf unterschiedliche Temperaturen gebracht werden. Fig. 2 shows a schematic sectional view of another embodiment of the method according to the invention. The steel sheet body 1 was brought by moving the first contact plate 2 with this and a second contact plate 3 in contact. The displacement of the two contact plates 2, 3 arranged parallel to one another takes place through the closing device 11. The first contact plate 2 is or has been brought by an energy source 5 to an elevated temperature relative to the steel sheet body. The second contact plate 3 is or was brought by a further energy source 5 to a relative to the steel sheet body elevated temperature. In this case, the first contact plate 2 and the second contact plate 3 can be brought by the power sources 5 both to the same temperature and to different temperatures.

Fig. 3a zeigt eine schematische Schnittdarstellung eines ersten Verfahrensschrittes zu einer Temperierung der Kontaktplatten. Die erste Kontaktplatte 2 und zweite Kontaktplatte 3 werden zeitlich vor der Kontaktierung mit dem Stahlblechkörper in gegenseitigen Kontakt zueinander gebracht. Anschließend wird die zweite Kontaktplatte 3 durch die Energiequelle 5 aufgeheizt. Die Temperatur überträgt sich anschließend auf die mit der zweiten Kontaktplatte 3 in Kontakt stehenden ersten Kontaktplatte 2. Fig. 3a shows a schematic sectional view of a first process step to a temperature of the contact plates. The first contact plate 2 and the second contact plate 3 are brought into mutual contact with each other before contacting with the steel sheet body. Subsequently, the second contact plate 3 is heated by the power source 5. The temperature then transfers to the first contact plate 2 contacting the second contact plate 3.

Fig. 3b zeigt eine schematische Schnittdarstellung eines zweiten Verfahrensschrittes zu einer Anwendung der Kontaktplatten, der sich an den in Fig. 3a dargestellten Verfahrensschritt anschließt. Die erste Kontaktplatte 2 und die zweite Kontaktplatte 3 werden voneinander getrennt. Der Stahlblechkörper 1 wird zwischen die getrennten Kontaktplatten 2,3 eingeführt. Fig. 3b shows a schematic sectional view of a second method step to an application of the contact plates, which conform to the in Fig. 3a followed by the process step. The first contact plate 2 and the second contact plate 3 are separated from each other. The sheet steel body 1 is inserted between the separate contact plates 2, 3.

Fig. 3c zeigt eine schematische Schnittdarstellung eines dritten Verfahrensschrittes zu einer Anwendung der Kontaktplatten 2 und 3, der sich an den in Fig. 3b dargestellten Verfahrensschritt anschließt. Die erste Kontaktplatte 2 und die zweite Kontaktplatte 3 wurden durch Schließen der Schließvorrichtung 11 mit dem Stahlblechkörper 1 in Kontakt gebracht. Dabei besitzen sowohl die erste Kontaktplatte 2 als auch die zweite Kontaktplatte 2 eine gegenüber dem Stahlblechkörper 1 erhöhte Temperatur. Fig. 3c shows a schematic sectional view of a third method step for an application of the contact plates 2 and 3, which conform to the in Fig. 3b followed by the process step. The first contact plate 2 and the second contact plate 3 were brought into contact with the steel sheet body 1 by closing the closing device 11. In this case, both the first contact plate 2 and the second contact plate 2 have a relation to the steel sheet body 1 increased temperature.

In den Zeichnungsfiguren nicht dargestellt ist die mindestens eine Abkühlplatte, mit der der Stahlblechkörper 1 nach dem Erwärmen in einem anschließenden Verfahrensschritt in Kontakt gebracht werden kann. Diese kann hierbei jedoch ähnliche Abmessungen wie die Kontaktplatten 2,3 aufweisen. In vorteilhafter Weise können zwei Abkühlplatten vorhanden sein, die in ähnlicher Weise wie die Kontaktplatten 2,3 mit dem Stahlblechkörper in Kontakt gebracht werden. In einer weiteren bevorzugten Ausführungsform ist die mindestens eine Abkühlplatte gekühlt. Dazu kann sie beispielsweise Kühlkanäle aufweisen.Not shown in the drawing figures, the at least one cooling plate, with which the sheet steel body 1 can be brought into contact after heating in a subsequent process step. However, this may have similar dimensions as the contact plates 2.3. Advantageously, there may be two cooling plates which are brought into contact with the sheet steel body in a similar manner as the contact plates 2, 3. In a further preferred embodiment, the at least one cooling plate is cooled. For this purpose, it may, for example, have cooling channels.

In einem Ausführungsbeispiel des Verfahrens wurde eine flach ausgebildete Blechplatine aus einem Stahl der Zusammensetzung 22MnB5 (Handelsbezeichnung MBW-K1500AS von ThyssenKrupp) mit einer AlSi10-Beschichtung als Stahlblechkörper 1 zwischen einer ersten Kontaktplatte 2 und einer zweiten Kontaktplatte 3 fixiert. Die Temperatur der Kontaktplatten betrug 1020°C. Die Blechplatine wurde für eine Kontaktzeit von 20 s zwischen den Kontaktplatten gehalten. Unter der Kontaktzeit wird hierbei die Zeitspanne, in der die Blechplatine von den beiden Kontaktplatten 2 und 3 kontaktiert wird, verstanden. Die Blechplatine befand sich für eine Zeitspanne von ca. 12 s oberhalb der Ac3 -Temperatur. Nach Beendigung dieser thermischen Behandlung wies die Blechplatine eine kompakte, festhaftende Korrosions- bzw. Verzunderungsschutzschicht aus festen AlFeSiintermetallischen Phasen auf.In one embodiment of the method, a flat-formed sheet metal blank made of a steel of the composition 22MnB5 (trade name MBW-K1500AS of ThyssenKrupp) with an AlSi10 coating fixed as a sheet steel body 1 between a first contact plate 2 and a second contact plate 3. The temperature of the contact plates was 1020 ° C. The sheet metal blank was held between the contact plates for a contact time of 20 seconds. In this case, the contact time is understood as meaning the time span in which the sheet metal blank is contacted by the two contact plates 2 and 3. The metal sheet was above the A c3 temperature for a period of about 12 seconds. Upon completion of this thermal treatment, the sheet metal blank had a compact, adherent anticorrosive coating of AlFeSi-intermetallic solid phases.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

11
StahlblechkörperSheet steel body
22
Erste KontaktplatteFirst contact plate
33
Zweite KontaktplatteSecond contact plate
44
Richtungdirection
55
Energiequelleenergy
66
Erster FlächenabschnittFirst surface section
77
Zweiter FlächenabschnittSecond surface section
88th
Isolationsschichtinsulation layer
99
TemperaturregeleinrichtungTemperature control device
1010
TemperaturkontrolleinrichtungTemperature control device
1111
Schließvorrichtungclosing device

Claims (9)

  1. Method for thermally treating at least one coated steel sheet body, in particular a steel sheet body coated with Al-Si, before a hot-forming process, wherein
    - the coated steel sheet body (1) is fixed in position,
    - at least one first contact plate (2) is brought into contact with at least one first surface portion (6) of the steel sheet body (1),
    - at least one second contact plate (3) is brought into contact with at least one second surface portion (7) of the steel sheet body (1),
    - the contact plates (2, 3) have an areal form substantially or entirely corresponding to the contour of the surface portions (6, 7) of the steel sheet body (1), and are arranged extending substantially parallel to one another when in contact with the steel sheet body (1),
    - at least one contact plate (2, 3) is at a higher temperature than the steel sheet body (1) when it makes contact with the steel sheet body (1),
    - the at least one contact plate (2, 3) at a higher temperature during contact is at a temperature above Ac3, in particular is at a temperature of between 20°C and 250°C above Ac3, such that the steel sheet body (1) is austenitized, and
    - the steel sheet body (1) is then introduced into a pressing tool or forming tool and formed by a hot-forming process.
  2. Method according to Claim 1, wherein the steel sheet body (1) is at a temperature above Ac3 for a time period of between 5 s and 90 s, in particular for a time period of between 10 s and 30 s.
  3. Method according to either of the preceding claims, wherein the steel sheet body (1) makes contact with the two contact plates (2, 3) for a time period of between 10 s and 120 s, preferably for a time period of between 15 s and 40 s.
  4. Method according to one of the preceding claims, wherein the contact plates (2, 3) are pressed onto the steel sheet body (1).
  5. Method according to one of the preceding claims, wherein the temperature in at least one partial region of the at least one contact plate (2, 3) at a higher temperature is controlled by a temperature controlling device (9) and/or monitored by a temperature monitoring device (10) before and/or during contact between the steel sheet body (1) and the contact plates (2, 3).
  6. Method according to one of the preceding claims, wherein at least one contact plate (2, 3) is removed in a further method step.
  7. Method according to one of the preceding claims, wherein the steel sheet body (1) is formed in an immediately following working step, and the at least one first surface portion (6) and second surface portion (7) lie in or in the vicinity of the region to be formed.
  8. Method according to one of the preceding claims, wherein, after heating in a subsequent method step, the steel sheet body (1) is brought into contact with at least one cooling plate, and wherein the cooling plate is at a lower temperature than the steel sheet body (1), in particular is at a temperature of between 400°C and 600°C.
  9. Method according to Claim 8, wherein the at least one cooling plate is cooled.
EP20080105691 2008-10-29 2008-10-29 Method for thermal treatment of a coated steel sheet body Active EP2182081B1 (en)

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PCT/DE2009/075063 WO2010048950A1 (en) 2008-10-29 2009-10-28 Method and apparatus for the thermal treatment of a coated steel sheet element

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CN113528940B (en) * 2021-06-16 2022-06-21 首钢集团有限公司 Aluminum-silicon alloy plating layer hot forming steel and preparation method thereof

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