US20100300584A1 - Method for producing a shaped component having at least two structural regions of different ductility - Google Patents

Method for producing a shaped component having at least two structural regions of different ductility Download PDF

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Publication number
US20100300584A1
US20100300584A1 US12/745,360 US74536008A US2010300584A1 US 20100300584 A1 US20100300584 A1 US 20100300584A1 US 74536008 A US74536008 A US 74536008A US 2010300584 A1 US2010300584 A1 US 2010300584A1
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United States
Prior art keywords
temperature
blank
region
furnace
zone
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Abandoned
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US12/745,360
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English (en)
Inventor
Otto Buschsieweke
Stefan Adelbert
Johannes Böke
Markus Pellmann
Jürgen Krogmeier
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Benteler Automobiltechnik GmbH
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Benteler Automobiltechnik GmbH
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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, BOEKE, JOHANNES, BUSCHSIEWEKE, OTTO, KROGMEIER, JUERGEN, PELLMANN, MARKUS
Publication of US20100300584A1 publication Critical patent/US20100300584A1/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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • 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
    • F27B9/028—Multi-chamber type 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
    • C21D2221/00—Treating localised areas of an article
    • 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

Definitions

  • the invention relates to a method for producing a shaped component with at least two structural regions of different ductility from a metallic blank that has been cut from strip material, whereby the blank has differently heated regions and then undergoes a thermoforming process to form it into the shaped component (preamble of claims 1 , 2 , 3 ).
  • DE 102 56 621 B3 describes a method for producing a shaped component with at least two structural regions of different ductility, and a continuous furnace for this method.
  • a semi-finished product of hardenable steel moves through a continuous furnace with at least two zones having different temperature levels and arranged side-by-side in movement direction.
  • the semi-finished product is hereby heated to different temperatures so as to establish two structural regions of different ductility during a subsequent thermoforming process.
  • DE 102 08 216 C1 also discloses a method for producing a shaped component with at least two structural regions of different ductility.
  • a semi-finished product of hardenable steel moves hereby through a heating device with homogenous temperature distribution and is heated completely to an austenitization temperature.
  • a partial region of first kind of the semi-finished product is then cooled down during its further transport that the base material can convert from austenite to ferrite and/or perlite.
  • a subsequent thermoforming process does not cause any or causes only little martensitic formation.
  • the partial region of first kind has a high ductility.
  • the other partial region of second kind of the semi-finished product is subjected during the transport to a temperature which is held at a level to allow the formation of just enough martensitic structures during the subsequent thermoforming process.
  • the partial region of second kind has a smaller ductility but greater strength.
  • the invention is based on the object to provide a method for the production of a shaped component with at least two structural regions of different ductility, which method obviates problems associated with scaling.
  • a blank cut from strip material of such a substance is completely homogenously heated first to such a temperature and maintained at this temperature level for a defined time that a diffusion layer as corrosive or scale protective layer is formed, wherein material from the coating diffuses into the base substance.
  • the heating temperature is about 830° C. to 950° C., preferably about 920° C.
  • This homogenous heating is carried out advantageously in a 1 st zone of a continuous furnace which has several temperature zones.
  • a region of first kind of the blank is cooled down in a 2 nd zone of the furnace to a temperature which causes austenite to break down. This takes place at about 550° C. to 700° C., preferably at about 625° C. This lowered temperature level is maintained for a defined time so that the break down of austenite is reliably implemented.
  • the temperature in a region of second kind is maintained in a 3 rd zone just enough to allow formation of martensitic structures during the subsequent thermoforming in a respective press.
  • This temperature is at 830° C. to 950° C., preferably at about 900° C.
  • the regions of first and second kinds of the shaped component have different ductility properties, with the region of second kind, compared to the region of first kind, having a smaller ductility but yet higher strength properties.
  • Such shaped components manufactured in this way can have concrete sections that can be best suited to the demands at hand in order to meet its characteristic as structural component, for example as component of a vehicle body.
  • a second solution of the object which the invention is based upon is set forth by the features of claim 2 .
  • a diffusion layer as corrosive or scale protective layer is hereby realized by alloying strip material from high-strength boron steel, coated with an Al/Si coating, in a first operating step during continuous advance through a pre-furnace and then cooling it down.
  • the temperature is 830° C. to 950° C., preferably about 920° C.
  • Blanks are then severed in a further operating step from this alloyed strip material. Subsequently, each severed blank is transferred into a two-zone furnace. A region of second kind of the blank is hereby austenitized at a temperature of 830° C. to 950° C., preferably about 930° C. The region of first kind is heated to a temperature which at a maximum is below the austenitization temperature which is about 550° C. to 700° C., preferably about 680° C.
  • This type of heat treatment causes the regions of second kind of the shaped components ultimately manufactured in a thermoforming process from the blanks to have smaller ductility properties, compared to the regions of first kind, but, yet have higher strength properties.
  • a third solution of the object which the invention is based upon is set forth by the features of claim 3 .
  • each blank is homogenously heated in a second operating step in a pre-furnace to a temperature of about 830° C. to 950° C., preferably about 920° C., maintained at this temperature level for a defined time, and then cooled down again. Formation of a diffusion layer as corrosive or scale protective layer is hereby realized from the Al/Si coating of the strip material.
  • each blank is then transferred to a two-zone furnace and a region of first kind is again heated in a 1 st zone of the furnace to a temperature of about 550° C. to 700° C., preferably about 680° C.
  • a region of second kind is heated in a 2 nd zone of the furnace to a temperature of 830° C. to 950° C., preferably about 920° C.
  • the blank is formed by a thermoforming process into a shaped component.
  • the shaped component has then a region of second kind which, compared to the region of first kind, has smaller ductility properties but higher strength properties.
  • the local cool down of the region of first kind of the blank can be realized after heating by contacting the region of first kind momentarily with cooling jaws.
  • FIG. 1 a schematic illustration of the production of a shaped component with two structural regions having different ductility
  • FIG. 2 a schematic illustration of a further method for the production of a shaped component with two structural regions having different ductility
  • FIG. 3 a schematic illustration of a third method for the production of a shaped component with two structural regions having different ductility.
  • FIGS. 1 to 3 designates in FIGS. 1 to 3 a shaped component with two structural regions 2 , 3 of different ductility.
  • the shaped component 1 involves a B column of an otherwise unillustrated vehicle body.
  • a strip material 4 from such steel is wound according to FIG. 1 to a coil 5 .
  • the strip material 4 is then drawn continuously from this coil 5 and guided through a punch 6 .
  • Blanks 7 are cut from the strip material 4 in the punch 6 and then fed to a continuous furnace 11 having three temperature zones 8 , 9 , 10 .
  • each blank 7 is completely homogenously heated to a temperature of about 830° C. to 950° C., preferably 920° C., and maintained at this temperature level over a defined time t ( FIG. 2 ).
  • a region 12 of first kind of the blank 7 is cooled down in a 2 nd zone 9 of the continuous furnace 11 to a temperature of about 550° C. to 700° C., preferably about 680° C., cooled down and maintained at this lowered temperature level over a defined time t 1 .
  • a region 13 of second kind of the blank 7 is maintained in a 3 rd zone 10 of the continuous furnace 11 at a temperature level of about 830° C. to 950° C., preferably about 900° C.
  • the heat-treated blank 7 is thermoformed into the shaped component 1 in a press not shown in greater detail.
  • the temperature profile as a function of the time during passage of the blank 7 through the continuous furnace 11 with respect to the region 12 of first kind and the region 13 of second kind of the blank 7 , with the lower graph 14 depicting the heat treatment of the region 12 of first kind, i.e. the temperature profile of the “soft” section of a blank 7 , and the upper graph 15 depicting the heat treatment of the region 13 of second kind, that is the temperature profile of the “hardened” section of a blank 7 .
  • FIG. 2 shows a method for the production of a shaped component 1 with two structural regions 2 , 3 of different ductility, whereby strip material 4 of boron steel provided with an Al/Si coating is first drawn from a coil 5 and guided through a pre-furnace 16 .
  • the strip material 4 is homogenously heated in the pre-furnace 16 to a temperature of about 830° C. to 950° C., preferably about 920° C., and maintained at this temperature level over a defined time.
  • the thus heat-treated strip material 4 is then wound to a coil 17 .
  • the heat-treated strip material 4 is fed from this coil 17 to a punch 18 for cutting blanks 7 from the strip material 4 .
  • the strip material 4 may also be cooled down directly after exiting the pre-furnace 16 and then fed to the punch 18 .
  • These blanks 7 from the pre-treated strip material 4 are then transferred to a two-zone furnace 19 and a region 12 of first kind is heated therein in a 1 st zone 20 of the furnace 19 to a temperature of about 550° C. to 700° C., preferably about 680° C., and a region 13 of second kind is heated simultaneously in a 2 nd zone 21 of the furnace 19 to a temperature of about 830° C. to 950° C.
  • the blanks 7 heat-treated in this manner are ultimately formed into shaped components 1 with two different structural regions 2 , 3 by way of a thermoforming process not shown in greater detail.
  • the lower graph 22 in the temperature-time diagram 23 of FIG. 2 shows in this context the temperature profile in the region 12 of first kind of the blank 7
  • the upper graph 24 shows the temperature profile in the region 13 of second kind of each blank 7 .
  • FIG. 3 illustrates the manner in which the strip material 4 of boron steel provided with an Al/Si coating is drawn from a coil 5 and directly fed to a punch 18 .
  • Blanks 7 are cut from the strip material 4 in the punch 18 and then fed to a pre-furnace 16 for homogenously heating the blanks 7 to a temperature of about 830° C. to 950° C., preferably about 920° C., and maintained at this temperature level over a defined time t 2 .
  • Blanks 7 heat-treated in this way are then transferred to the afore-mentioned two-zone furnace 19 and a region 12 of first kind is heated here, as described, in the 1 st zone 20 to a temperature of about 550° C. to 700° C., preferably about 680° C., and a region 13 of second kind is heated at the same time in the 2 nd zone 21 of the furnace 19 to a temperature of about 830° C. to 950° C.
  • the temperature-time diagram 23 corresponds to the one of FIG. 2 .
  • thermoforming process Also the thus heat-treated blanks 7 are finally formed into shaped components 1 with two different structural regions 2 , 3 by way of a thermoforming process.
US12/745,360 2007-11-29 2008-11-03 Method for producing a shaped component having at least two structural regions of different ductility Abandoned US20100300584A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007057855A DE102007057855B3 (de) 2007-11-29 2007-11-29 Verfahren zur Herstellung eines Formbauteils mit mindestens zwei Gefügebereichen unterschiedlicher Duktilität
DE102007057855.7 2007-11-29
PCT/DE2008/001799 WO2009067976A1 (de) 2007-11-29 2008-11-03 Verfahren zur herstellung eines formbauteils mit mindestens zwei gefügebereichen unterschiedlicher duktilität

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US20100300584A1 true US20100300584A1 (en) 2010-12-02

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US12/745,360 Abandoned US20100300584A1 (en) 2007-11-29 2008-11-03 Method for producing a shaped component having at least two structural regions of different ductility

Country Status (7)

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US (1) US20100300584A1 (de)
EP (1) EP2227570B1 (de)
CN (1) CN101796202A (de)
DE (1) DE102007057855B3 (de)
ES (1) ES2620804T3 (de)
RU (1) RU2445381C1 (de)
WO (1) WO2009067976A1 (de)

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JP2014147963A (ja) * 2013-02-01 2014-08-21 Aisin Takaoka Ltd 鋼板の赤外線加熱方法、加熱成形方法、赤外炉および車両用部品
US8888169B2 (en) 2011-01-31 2014-11-18 Benteler Sgl Gmbh & Co. Kg Motor vehicle structure, and method of making a motor vehicle structure
US20150352621A1 (en) * 2013-01-11 2015-12-10 Futaba Industrial Co., Ltd. Heating device for hot stamping
US20160017453A1 (en) * 2010-03-25 2016-01-21 Benteler Automobiltechnik Gmbh Method for producing a motor vehicle component, and a body component
US9340233B2 (en) 2010-10-15 2016-05-17 Benteler Automobiltechnik Gmbh Method for producing a hot-formed and press-hardened metal component
US9616488B2 (en) 2011-09-16 2017-04-11 Benteler Automobiltechnik Gmbh Method for producing structural components and chassis components by hot forming, and heating station
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
US10000823B2 (en) 2011-12-14 2018-06-19 Voestalpine Metal Forming Gmbh Method and device for partially hardening sheet metal components
US10086421B2 (en) 2015-01-07 2018-10-02 Thyssenkrupp Steel Europe Ag Tool for hot forming a workpiece and methods for selectively hot forming certain regions of a workpiece
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RU2010126492A (ru) 2012-01-10
EP2227570A1 (de) 2010-09-15
EP2227570B1 (de) 2017-01-25
RU2445381C1 (ru) 2012-03-20
CN101796202A (zh) 2010-08-04
ES2620804T3 (es) 2017-06-29

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