US20080036124A1 - Furnace, and hot forming line including such a furnace - Google Patents

Furnace, and hot forming line including such a furnace Download PDF

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Publication number
US20080036124A1
US20080036124A1 US11/761,634 US76163407A US2008036124A1 US 20080036124 A1 US20080036124 A1 US 20080036124A1 US 76163407 A US76163407 A US 76163407A US 2008036124 A1 US2008036124 A1 US 2008036124A1
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US
United States
Prior art keywords
furnace
modules
starting
add
module
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
US11/761,634
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English (en)
Inventor
Otto Buschsieweke
Christoph Mainka
Stefan Adelbert
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
Original Assignee
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38282490&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20080036124(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Assigned to BENTELER AUTOMOBILTECHNIK GMBH reassignment BENTELER AUTOMOBILTECHNIK GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ADELBERT, STEFAN, BUSCHSIEWEKE, OTTO, MAINKA, CHRISTOPH
Publication of US20080036124A1 publication Critical patent/US20080036124A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • 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
    • 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
    • C21D9/0056—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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/39—Arrangements of devices for discharging

Definitions

  • the present invention relates to a furnace for heat treatment of steel sheets or steel sheet structures, and to a hot forming line for making a hardened profiled steel sheet structure.
  • German Pat. No. DE 1 010 547 describes a continuous furnace for heat treatment of elongate objects such as rods or metal sheets.
  • the furnace includes a heat channel which is made of two portions arranged exchangeably behind one another.
  • the use of a continuous furnace in a hot forming line for making hardened profiled steel sheet structures is described in German Pat. Nos. DE 101 28 200 B4 and DE 102 54 695 B3.
  • Continuous furnaces can be designed up to a temperature of 1,300° C., optionally also under a protective atmosphere.
  • a hot forming line is constructed to meet a certain output or production rate. This is also the base for designing the capacity of the continuous furnace within the hot forming line. As the costs for these constructions are substantial, overdimensioning of the furnace is undesired. On the other hand, the production rate of the hot forming line and furnace cannot be reliably predicted for the future, when the hot forming line is initially put into operation. It is thus conceivable that the furnace and the hot forming line reach their operational limits as a result of a change in a customer's wish or increased output demand. To address this problem, either another hot forming line needs to be built or the existing hot forming line needs to be modified. Both approaches are accompanied by significant increase in labor and costs.
  • a furnace for heat treatment of a steel sheet or a steel sheet structure includes a heating zone formed by at least two furnace modules which are detachably connected to one another to thereby define a starting furnace module and an end furnace module, and at least one add-on furnace module which is constructed for placement between the starting and end furnace modules.
  • a hot forming line for making a hardened profiled steel sheet structure from a steel sheet includes a first manipulator for advancing a steel sheet, a continuous furnace receiving the steel sheet from the first manipulator for heating a steel sheet to a temperature above a microstructural transformation temperature in the austenitic state, a second manipulator receiving the heated steel sheet from the continuous furnace, a press tool receiving the heated steel sheet from the second manipulator for shaping the sheet steel into a profiled steel sheet structure, and a third manipulator removing the profiled steel sheet structure from the press tool, wherein the continuous furnace includes least two furnace modules which are detachably connected to one another to thereby define a starting furnace module and an end furnace module, and at least one add-on furnace module which is constructed for placement between the starting and end furnace modules.
  • the present invention resolves prior art problems by composing the heating zone of single furnace modules that are detachably connectable to one another.
  • the furnace is designed as a modular system by which the capacity of the furnace can be easily adapted to the situation at hand and to the customer's need.
  • a later demand for increased output can now be satisfied by simply adding one or more add-on furnace modules.
  • the productivity or efficiency of a hot forming line, which has integrated therein such a furnace can be enhanced, and the hot forming line can thus also be adjusted to the situation at hand.
  • Downtimes are minimal as any modification can easily be implemented because the furnace modules can be standardized and can be constructed with their own heating units, conveyors, insulations, air supply and air discharge ducts as well detachment and coupling means.
  • the add-on furnace module may have a length which corresponds to a total length of the starting and end furnace modules.
  • the starting and end furnace modules and the add-on furnace module may be coupled to one another via end flanges, with a seal being disposed between end the flanges.
  • At least one of the starting and end furnace modules and the add-on furnace module may have an inert gas supply.
  • the capacity and thus the productivity of a hot forming line can be adjusted to the need at hand.
  • the throughput can be increased, using standardized components. This provides benefits as far as logistics and assembly is concerned.
  • the furnace can be modified to increase throughput in a less time-consuming and labor intensive manner and with little costs.
  • FIG. 1 is a schematic illustration of a furnace according to the present invention, further depicting an add-on furnace module;
  • FIG. 2 is a schematic illustration of the furnace with installed add-on furnace module
  • FIG. 3 is a schematic cutaway view of a coupling region between two furnace modules
  • FIG. 4 is a schematic view of the coupling region, as viewed in a direction of arrow IV in FIG. 3 ;
  • FIG. 5 is a schematic illustration of a hot forming line according to the present invention.
  • FIG. 6 is a schematic illustration of the hot forming line of FIG. 5 with integrated pre-forming station.
  • the furnace 5 includes an entry zone E, a heating zone H, and an exit zone A.
  • the entry zone E essentially includes a feeding table 12 with integrated transport rolls 13 .
  • the exit zone A essentially includes a discharge table 14 with integrated transport rolls 15 .
  • the heating zone H includes two furnace modules 16 , 17 which can be detachably connected to one another to thereby define a leading or starting furnace module, generally designated by reference numeral 16 , and a terminal or end furnace module, generally designated by reference numeral 17 .
  • one or more add-on modules can be incorporated in the heating zone H.
  • An exemplary add-on furnace module 18 is shown in FIG. 1 and integrated in the heating zone H, as shown in FIG. 2 .
  • Installation of an add-on furnace module 18 involves initially a separation of the starting furnace module 16 from the end furnace module 17 , and subsequently insertion of one or more add-on furnace modules 18 between the starting and end furnace modules 16 , 17 .
  • the furnace modules 16 , 17 , 18 are connected to one another via end flanges 19 , 20 and screw bolts 21 via incorporation of a heat-resistant seal 22 , as shown in particular in FIGS. 3 and 4 .
  • the flanges 19 , 20 may, in addition, welded snugly together.
  • the furnace modules 16 , 17 , 18 are provided with an insulating lining 27 ( FIG. 4 )
  • Each of the furnace modules 16 , 17 , 18 is equipped with a heating unit 23 which may operate electrically or by gas.
  • each of the furnace modules 16 , 17 , 18 includes a conveyor 24 for transporting steel sheets 1 through the furnace modules 16 , 17 , 18 .
  • Each conveyor 24 includes a chain of rollers 25 .
  • the conveyors 24 of neighboring furnace modules 16 , 17 , 18 extend in close proximity of one another to establish a continuous transport path.
  • At least one of the furnace modules 16 , 17 , 18 is equipped with an inert gas supply 26 .
  • the individual furnace modules 16 , 17 , 18 have standard dimensions, with the add-on furnace module 18 having a length L 18 which is suitably twice a length L 16 of the starting furnace module 16 or twice a length L 17 of the end furnace module 17 .
  • the furnace module 16 and the end furnace module 17 may jointly have an overall length of 6 m so that the furnace 5 may be assembled of 6 m units.
  • the length L 18 of the add-on furnace module 18 is about equal to the joint total length of the starting and end furnace modules 16 , 17 .
  • FIG. 5 there is shown is a schematic illustration of a hot forming line according to the present invention which is provided for making a hardened profiled steel sheet structure from a steel sheet 1 and has incorporated a furnace 5 .
  • Hardened profiled steel sheet structures find application in the automobile industry, for example as A pillars, B pillars, or C pillars, as door impact carriers, or bumpers. Sidewall structures of a motor vehicle body are also produced nowadays, using a hot forming process and hardening in a press tool.
  • the steel sheet 1 is initially reeled off a coil 2 and straightened and then cut to size in a punching or cutting device 3 .
  • the steel sheet 1 may be pre-formed, before being transferred by a first manipulator 4 to the furnace 5 , constructed in the form of a continuous furnace.
  • Pre-forming of the sheet steel 1 is realized by a press 6 which is positioned upstream of the furnace 5 and in which the steel sheet 1 is shaped and, optionally trimmed, as shown in FIG. 6 .
  • the provision of the press 6 is the only difference between the hot forming lines of FIGS. 5 and 6 .
  • the furnace 5 heats the steel sheet 1 to a temperature above the microstructural transformation temperature in the austenitic state. Depending on the steel grade, this temperature ranges between 700° C. and 1,100° C. Suitably, the atmosphere of the furnace 5 is rendered inert by a targeted and sufficient supply of protective gas so as to prevent scaling of the steel sheet surface.
  • a second manipulator 7 accepts the heated steel sheet 1 and transfers it into a press tool 8 , where the steel sheet 1 is shaped into the final profiled steel sheet structure 9 and rapidly cooled down with the aid of a cooling unit 10 , thereby establishing a fine-grained martensitic or bainitic material microstructure.
  • the profiled steel sheet structure 9 is hereby hardened with a precisely tailored material strength.
  • a third manipulator 11 is arranged downstream of the press tool 8 to remove the shaped and hardened profiled steel sheet structure 9 from the press tool 8 and to transfer it to an unillustrated container.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
US11/761,634 2006-06-13 2007-06-12 Furnace, and hot forming line including such a furnace Abandoned US20080036124A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006027625A DE102006027625B3 (de) 2006-06-13 2006-06-13 Ofenanlage und Warmformlinie
DE102006027625.6 2006-06-13

Publications (1)

Publication Number Publication Date
US20080036124A1 true US20080036124A1 (en) 2008-02-14

Family

ID=38282490

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/761,634 Abandoned US20080036124A1 (en) 2006-06-13 2007-06-12 Furnace, and hot forming line including such a furnace

Country Status (5)

Country Link
US (1) US20080036124A1 (es)
EP (1) EP1867738B2 (es)
DE (1) DE102006027625B3 (es)
ES (1) ES2402579T5 (es)
PL (1) PL1867738T5 (es)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100276939A1 (en) * 2009-04-30 2010-11-04 Manfred Clynes Generating electricity using wind
CN102002566A (zh) * 2010-10-18 2011-04-06 王刚 无缝钢管校直淬火装置
US8733144B2 (en) 2010-01-06 2014-05-27 Benteler Automobiltechnik Gmbh Method and apparatus for hot forming and hardening a blank
US9694408B2 (en) 2012-11-07 2017-07-04 Benteler Automobiltechnik Gmbh Hot forming line and method for producing a hot formed and press hardened motor vehicle part
US11447838B2 (en) * 2016-01-25 2022-09-20 Schwartz Gmbh Method and device for heat treating a metal component

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009014670B4 (de) * 2009-03-27 2011-01-13 Thyssenkrupp Sofedit S.A.S Verfahren und Warmumformanlage zur Herstellung von pressgehärteten Formbauteilen aus Stahlblech
DE102009019496A1 (de) * 2009-05-04 2010-11-18 Braun, Elisabeth Vorrichtung und Verfahren zur Erwärmung warm umzuformender Werkstücke
CN102266900B (zh) * 2010-06-07 2015-11-25 蒂森克虏伯金属成型技术有限公司 用于制造锻压的钢板成型构件的方法和热成型装置
DE102012001335B4 (de) * 2012-01-25 2017-07-27 Elisabeth Braun Warmumformeinrichtung
DE102013107870A1 (de) * 2013-07-23 2015-01-29 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung von Formbauteilen sowie Formbauteil und Durchlaufofen
DE102013018109B4 (de) * 2013-12-03 2018-08-02 Eisenmann Se Verfahren, Ofeneinrichtung und Anlage zum Formhärten von Werkstücken
DE102013021584B4 (de) * 2013-12-19 2022-02-17 Onejoon Gmbh Verfahren, Ofeneinrichtung und Anlage zum Formhärten von Werkstücken
DE102014110415B4 (de) * 2014-07-23 2016-10-20 Voestalpine Stahl Gmbh Verfahren zum Aufheizen von Stahlblechen und Vorrichtung zur Durchführung des Verfahrens
DE102016121354B3 (de) * 2016-11-08 2018-05-09 Tower Automotive Holding Gmbh Anlage zum Herstellen eines warmgehärteten blechförmigen Werkstücks
DE102019201924A1 (de) * 2019-02-14 2020-08-20 Audi Ag Modulare Wärmebehandlungsanlage für die chargenweise Wärmebehandlung von metallischen Werkstücken
DE102021109672A1 (de) 2021-04-16 2022-10-20 Aerospace Transmission Technologies GmbH Vorrichtung zur Wärmebehandlung von metallischen Werkstücken
DE102021109677A1 (de) 2021-04-16 2022-10-20 Aerospace Transmission Technologies GmbH Härteofen zur Erwärmung von metallischen Werkstücken
DE102022118108A1 (de) 2022-07-20 2024-01-25 Onejoon Gmbh Vorrichtung zum thermischen oder thermo-chemischen Behandeln von Material

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US20010055740A1 (en) * 2000-02-02 2001-12-27 Btu International, Inc. Modular furnace system

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DE1010547B (de) * 1952-05-12 1957-06-19 Inter Continentaler Huettenbau Durchlaufofen zur Waermebehandlung von langgestrecktem Waermegut, wie Stangen oder Blechen
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CH416431A (fr) 1963-11-16 1966-06-30 Chomat Louis Four-tunnel
FR2369228A1 (fr) 1976-10-28 1978-05-26 Secail Jean Four a longueur variable pour la cuisson en monocouche de produits ceramiques
US5669992A (en) † 1996-01-30 1997-09-23 Bronsema; Brand Bumper beam making process
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Publication number Priority date Publication date Assignee Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100276939A1 (en) * 2009-04-30 2010-11-04 Manfred Clynes Generating electricity using wind
US8733144B2 (en) 2010-01-06 2014-05-27 Benteler Automobiltechnik Gmbh Method and apparatus for hot forming and hardening a blank
CN102002566A (zh) * 2010-10-18 2011-04-06 王刚 无缝钢管校直淬火装置
US9694408B2 (en) 2012-11-07 2017-07-04 Benteler Automobiltechnik Gmbh Hot forming line and method for producing a hot formed and press hardened motor vehicle part
US11447838B2 (en) * 2016-01-25 2022-09-20 Schwartz Gmbh Method and device for heat treating a metal component

Also Published As

Publication number Publication date
EP1867738A3 (de) 2008-06-25
EP1867738A2 (de) 2007-12-19
EP1867738B8 (de) 2013-03-06
ES2402579T3 (es) 2013-05-06
EP1867738B1 (de) 2013-01-09
PL1867738T5 (pl) 2017-09-29
DE102006027625B3 (de) 2007-08-09
ES2402579T8 (es) 2014-11-17
ES2402579T5 (es) 2017-03-15
EP1867738B2 (de) 2016-08-31
PL1867738T3 (pl) 2013-06-28

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AS Assignment

Owner name: BENTELER AUTOMOBILTECHNIK GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BUSCHSIEWEKE, OTTO;MAINKA, CHRISTOPH;ADELBERT, STEFAN;REEL/FRAME:019415/0704

Effective date: 20070611

STCB Information on status: application discontinuation

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