US20140224388A1 - Heat treatment line and method for operating the heat treatment line - Google Patents

Heat treatment line and method for operating the heat treatment line Download PDF

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Publication number
US20140224388A1
US20140224388A1 US14/180,106 US201414180106A US2014224388A1 US 20140224388 A1 US20140224388 A1 US 20140224388A1 US 201414180106 A US201414180106 A US 201414180106A US 2014224388 A1 US2014224388 A1 US 2014224388A1
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US
United States
Prior art keywords
temperature
station
metal component
heat treatment
component
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.)
Abandoned
Application number
US14/180,106
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English (en)
Inventor
Georg Frost
Werner Morgenroth
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.)
Benteler Automobiltechnik GmbH
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Benteler Automobiltechnik GmbH
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 Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Publication of US20140224388A1 publication Critical patent/US20140224388A1/en
Assigned to BENTELER AUTOMOBILTECHNIK GMBH reassignment BENTELER AUTOMOBILTECHNIK GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FROST, GEORG
Abandoned legal-status Critical Current

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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
    • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • 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
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone

Definitions

  • the present invention relates to a heat treatment line and a method for operating the heat treatment line.
  • the hot forming and press hardening technology has been standardized for many years, wherein a sheet metal blank, which is heated to austenizing temperature, is inserted into a forming tool, hot formed in this forming tool and at the same time quenched in the forming tool and thereby hardened.
  • a device for hardening components it is further possible to first form the component, subsequently heat the component to above austenzing temperature and thereafter take up the component again and cool the component in a quenching station at such a fast rate that the microstructure of the component is hardened.
  • a device is for example known from DE 102 009 051 157 B4.
  • chamber furnaces which can be space effectively arranged in a mounting hall.
  • Such a chamber furnace has however a limited capacity so that it can essentially only take up one component at a time.
  • the further processing is interrupted, for example when a manipulator for loading the chamber furnace has failed, this leads to halts in the production process so that the components may remain in the chamber furnace for a longer period of time.
  • the chamber furnaces are heated to above austenizing temperature and therefore require high energy consumption for operating the furnace itself.
  • a heat treatment One for producing a heat treated, in particular pre-coated metal component includes a heating station which heats at least regions of the metal component to a component temperature above austenizing temperature; and a temperature treatment station, the temperature treatment station having at least in regions an internal temperature which essentially corresponds to the component temperature of the metal component.
  • a heating station is thus provided in the heat treatment line, which may preferably be configured as chamber furnace, alternatively also as rotary kiln or continuous furnace.
  • the component is heated to the desired component temperature.
  • This component temperature is particularly preferably above the austenizing temperature and is thus between 800° C. and 1000° C., in particular between 850° C. and 950° C.
  • This austenizing temperature is established at least in regions of the component with the heat treatment line according to the invention. The remaining regions of the component then remain at a temperature below the austenizing temperature.
  • the internal temperature of the heating station is to be set above this temperature. When a particularly fast heating time of the metal component is to be achieved, the internal temperature of the heating station is to be set significantly above the component temperature.
  • the temperature inside the heating station is thus preferably between 950° C. to 1300° C., in particular 1100° C. to 1200° C.
  • the internal temperature of the heating station is to be selected so as to be in particular 5 to 30% above the component temperature, preferably 10 to 25% above the component temperature.
  • the heating station can in particular be configured as furnace with a burner.
  • the components thus heated to component temperature are then removed from the heating station and according to the invention transferred into a temperature treatment station.
  • the temperature treatment station is configured as intermediate station, in order to maintain the temperature established in the component itself at least in regions. Also in the temperature treatment station itself the component temperature is then held at least in regions, whereas the non-heated regions are correspondingly below the component temperature.
  • an internal temperature which corresponds to the component temperature itself is preferably present in the temperature treatment station.
  • an internal temperature exists in the temperature treatment, which is set slightly above, in particular between 0 and 10%, particularly preferably between 1 and 5%, above the component temperature. It is thus possible to maintain the component temperature inside the temperature treatment station for a longer period of time.
  • a component which may not be fully austenized inside the material due to production fluctuations is further maintained at component temperature in the temperature treatment station so that a complete austenization occurs as a result of heat conduction inside the component itself. Due to the fact that the internal temperature of the temperature treatment station is selected so as to be not higher, in particular not significantly higher, than the component temperature itself, the temperature treatment station can be operated with lower energy costs compared to the heating station.
  • the temperature treatment station is particularly preferably constructed as continuous furnace.
  • the advantage compared to the state-of-the-art is however that different from conventional continuous furnaces, the temperature treatment station does not have to have lengths of several dozen meters, so that the component is heated to a temperature by the continuous furnace over the time period in which it is to be transported, but is only held at the temperature. It is thus possible to configure the temperature treatment station to be only a few meters long.
  • the temperature treatment station and the heating station are suited to subject only regions of the metal components to temperature treatment.
  • a metal component means a blank, wherein the metal component can be treated with the heat treatment line according to the invention also as already three-dimensionally formed metal component. Further particularly preferably pre-coated materials for example a blank with a metallic coating can also be used.
  • the temperature treatment station itself is constructed as chamber furnace, wherein multiple chamber furnaces are arranged on top of each other and/or adjacent each other. It is then possible by using a manipulator, in particular in the form of an industrial robot, to load the multiple chamber furnaces in the temperature treatment station or to remove the components that are temperature treated in the multiple chamber furnaces. Also in the chamber furnace or in the rotary kiln described below it is again possible to bring only regions of the component to the desired component temperature. Also in this case it is again possible, for example by means of covering elements in the form of cooling plates or by means of intermediate walls, sealing walls or an insulation, to cool other regions or to keep other regions colder than the component temperature.
  • the temperature treatment station is constructed as rotary kiln.
  • the rotary kiln is in particular constructed so that it has multiple receiving possibilities for receiving metal components on top of each other and also radially circumferentially adjacent each other. A respective empty chamber of the temperature treatment station can then be loaded by the manipulator.
  • a cooling station is arranged downstream of the temperature treatment station.
  • the components heated to above austenizing temperature are removed from the temperature treatments station and then quench hardened in the cooling station.
  • This can for example be realized by means of a sprinkler or shower, so that the component is guided through a sprayed-on cooling medium.
  • the cooling station is configured as dip bath, wherein the component is removed and dipped into the cooling station. In this case the material of the microstructure of the component undergoes such a change that the austenitic microstructure is transformed into an essentially martensitic microstructure.
  • the cooling station can also be a hot forming and press-hardening tool.
  • the correspondingly heat treated component is then transferred out of the temperature treatment station into the hot forming tool where it is hot formed and subsequently press hardened.
  • press hardening also only occurs in the austenized regions, wherein in contrast to this, the regions, which were not temperature treated are not completely austenized and thus also not completely hardened. These regions have a rather ductile component property.
  • a method for operating the heat treatment line includes establishing an internal temperature of the heat treatment station above the component temperature of the metal component; introducing the metal component into the heating station; heating at least regions of the metal component in the heat treatment station to a component temperature above austenizing temperature; and introducing the metal component into the in the temperature treatment station.
  • an internal temperature is set in the heat treatment station which is between 1000° C. and 1300° C., in particular between 1100° C. and 1200° C. and the internal temperature of the temperature treatment station is between 800° C. and 1000° C., preferably between 850° C. and 950° C.
  • the temperature treatment station is used as a buffer in order to compensate downtime and/or production halts at the heating station and/or at the cooling station.
  • a particularly advantageous embodiment of the method is to remove the metal component from the heating station at an actual temperature of the component of 700° C. to 1100° C., preferably 800° C. to 1000° C., in particular 850° C. to 950° C., and to subsequently post heat at least regions of the metal component in the temperature treatment station to above austenizing temperature, in particular to the component temperature, particularly preferably to at least 900° C. It is also possible to then heat the entire component in the downstream temperature treatment station to above 900° C. This results in an overall shortened run time to realize the pre-coated metal component on the corresponding heat treatment line when producing an at least regionally homogenous intermetallic alloy coating.
  • an aluminum-silicone coating is used as metallic pre-coating on the metal component to be heat treated, in particular to be hot formed and press hardened.
  • the time of the heating phase can further be shortened when a metal component with a pre-alloyed metallic pre-coating is produced.
  • Pre-alloyed means that a heat treatment with diffusion processes between steel substrate and the elements of the metallic coating is already carried out prior to the heating station, in particular at the steel producer.
  • FIG. 1 shows a heat treatment line according to the invention with a temperature treatment station in the form of a roller conveyor furnace and
  • FIG. 2 shows a heat treatment line according to the invention with a temperature treatment station in the form of a rotary kiln.
  • the heat treatment line 1 has a heating station 2 in the form of three adjacently arranged chamber furnaces 3 and a temperature treatment station 4 arranged downstream of the heat treatment station 2 .
  • the temperature treatment station 4 itself is constructed as roller conveyor furnace 5 , so that the roller conveyor furnace 5 has a receiving side 6 with a not further shown receiving opening and a retrieval side 7 with a not further shown retrieval opening.
  • a cooling station 8 for example in the form of a dip bath.
  • a respective industrial robot 9 is used which transfers the not further shown metal components between the individual stations.
  • FIG. 2 shows an alternative embodiment wherein the heat treatment line 1 again has a heating station 2 in which the chamber furnaces are arranged adjacent one another.
  • the temperature treatment station 4 itself is constructed in the form of a rotary kiln 10 which can be freely rotated in the rotation direction D in order to transfer the individual components via an industrial robot 9 from the heating station 2 into the rotary kiln and after a defined incubation time in the rotary kiln 10 to remove the components from the rotary kiln 10 and feed the components to the cooling station 8 .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)
US14/180,106 2013-02-14 2014-02-13 Heat treatment line and method for operating the heat treatment line Abandoned US20140224388A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102013101489.5 2013-02-14
DE102013101489.5A DE102013101489B3 (de) 2013-02-14 2013-02-14 Wärmebehandlungslinie und Verfahren zum Betreiben der Wärmebehandlungslinie
EP13186929.9 2013-10-01
EP13186929.9A EP2767599B1 (de) 2013-02-14 2013-10-01 Verfahren zum Betreiben einer Wärmebehandlungslinie

Publications (1)

Publication Number Publication Date
US20140224388A1 true US20140224388A1 (en) 2014-08-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US14/180,106 Abandoned US20140224388A1 (en) 2013-02-14 2014-02-13 Heat treatment line and method for operating the heat treatment line

Country Status (5)

Country Link
US (1) US20140224388A1 (zh)
EP (1) EP2767599B1 (zh)
CN (1) CN103993137A (zh)
DE (1) DE102013101489B3 (zh)
ES (1) ES2845558T3 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10619925B2 (en) 2013-01-11 2020-04-14 Futaba Industrial Co., Ltd. Heating device for hot stamping
US11027325B2 (en) 2016-12-22 2021-06-08 Benteler Automobiltechnik Gmbh Hot-formed metal sheet and method of producing an opening in such a metal sheet
US11578382B2 (en) 2018-04-28 2023-02-14 Ironovation Materials Technology Co., Ltd. Hot stamped component, precoated steel sheet used for hot stamping and hot stamping process
US11644239B2 (en) 2018-02-13 2023-05-09 Ebner Industrieofenbau Gmbh Arrangement having plural temperature-control stations for heat treating component parts, and their handling

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL2905346T3 (pl) * 2014-01-23 2021-03-08 Schwartz Gmbh Sposób obróbki cieplnej
DE102016100648B4 (de) 2015-12-23 2018-04-12 Benteler Automobiltechnik Gmbh Wärmebehandlungsofen sowie Verfahren zur Wärmebehandlung einer vorbeschichteten Stahlblechplatine und Verfahren zur Herstellung eines Kraftfahrzeugbauteils
DE102017107549A1 (de) 2017-04-07 2018-10-11 Schwartz Gmbh Temperierstation zur partiellen Wärmebehandlung eines metallischen Bauteils

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6280542B1 (en) * 1996-06-07 2001-08-28 Corus Technology Bv Method and apparatus for the manufacture of a steel strip

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004007071B4 (de) * 2004-02-13 2006-01-05 Audi Ag Verfahren zur Herstellung eines Bauteils durch Umformen einer Platine und Vorrichtung zur Durchführung des Verfahrens
EP2182082B2 (de) * 2008-10-29 2018-01-24 Neue Materialien Bayreuth GmbH Verfahren und Vorrichtung zur Temperierung eines Stahlblechkörpers
DE102009019496A1 (de) * 2009-05-04 2010-11-18 Braun, Elisabeth Vorrichtung und Verfahren zur Erwärmung warm umzuformender Werkstücke
DE102009051157B4 (de) * 2009-10-29 2011-09-22 Benteler Automobiltechnik Gmbh Kammerofen mit Übertemperatur
DE102010010156A1 (de) * 2010-03-04 2011-09-08 Kirchhoff Automotive Deutschland Gmbh Verfahren zur Herstellung eines Formteiles mit mindestens zwei Gefügebereichen unterschiedlicher Duktilität
PL2497840T5 (pl) * 2011-03-10 2020-07-27 Schwartz Gmbh Układ pieca do częściowego ogrzewania części z blachy stalowej
EP2548975A1 (de) * 2011-07-20 2013-01-23 LOI Thermprocess GmbH Verfahren und Vorrichtung zur Herstellung eines gehärteten metallischen Bauteils mit mindestens zwei Bereichen unterschiedlicher Duktilität
DE102012218159B4 (de) * 2012-10-04 2018-02-08 Ebner Industrieofenbau Gmbh Handhabungseinrichtung
DE102012110649C5 (de) * 2012-11-07 2018-03-01 Benteler Automobiltechnik Gmbh Warmformlinie sowie Verfahren zur Herstellung eines warmumgeformten und pressgehärteten Kraftfahrzeugbauteils

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6280542B1 (en) * 1996-06-07 2001-08-28 Corus Technology Bv Method and apparatus for the manufacture of a steel strip

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10619925B2 (en) 2013-01-11 2020-04-14 Futaba Industrial Co., Ltd. Heating device for hot stamping
US11027325B2 (en) 2016-12-22 2021-06-08 Benteler Automobiltechnik Gmbh Hot-formed metal sheet and method of producing an opening in such a metal sheet
US11644239B2 (en) 2018-02-13 2023-05-09 Ebner Industrieofenbau Gmbh Arrangement having plural temperature-control stations for heat treating component parts, and their handling
US11578382B2 (en) 2018-04-28 2023-02-14 Ironovation Materials Technology Co., Ltd. Hot stamped component, precoated steel sheet used for hot stamping and hot stamping process
US11667988B2 (en) 2018-04-28 2023-06-06 Ironovation Materials Technology Co., Ltd. Hot stamped component, precoated steel sheet used for hot stamping and hot stamping process

Also Published As

Publication number Publication date
ES2845558T3 (es) 2021-07-27
CN103993137A (zh) 2014-08-20
EP2767599B1 (de) 2020-12-09
DE102013101489B3 (de) 2014-06-05
EP2767599A1 (de) 2014-08-20

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AS Assignment

Owner name: BENTELER AUTOMOBILTECHNIK GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FROST, GEORG;REEL/FRAME:038550/0950

Effective date: 20150305

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION