EP2227570B1 - Procédé de fabrication d'une pièce façonnée comprenant au moins deux zones structurelles à ductilité différente - Google Patents

Procédé de fabrication d'une pièce façonnée comprenant au moins deux zones structurelles à ductilité différente Download PDF

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Publication number
EP2227570B1
EP2227570B1 EP08854114.9A EP08854114A EP2227570B1 EP 2227570 B1 EP2227570 B1 EP 2227570B1 EP 08854114 A EP08854114 A EP 08854114A EP 2227570 B1 EP2227570 B1 EP 2227570B1
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Prior art keywords
temperature
blank
furnace
zone
type
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EP08854114.9A
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German (de)
English (en)
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EP2227570A1 (fr
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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    • 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 molded component having at least two structural regions of different ductility from a metallic circuit board separated from strip material, in which the board is heated differently in regions and then subjected to a thermoforming process for the purpose of forming into the molded component (preamble of claims 1, 2 and 3) ).
  • the DE 102 56 621 B3 describes a method for producing a molded component having at least two structural regions of different ductility and a continuous furnace for this process.
  • a semifinished product made of a hardenable steel passes through a continuous furnace with at least two zones arranged side by side in the direction of passage and with different temperature levels.
  • the semi-finished product is different heated so that set in a subsequent thermoforming process two microstructures of different ductility.
  • a method for producing a molded component with at least two structural areas of different ductility known.
  • a semi-finished product made of a hardenable steel passes through a heating device with a homogeneous temperature distribution and is heated in this completely austenitizing.
  • a portion of the first type of semifinished product is cooled during its further transport so that a transformation of the base material of austenite into ferrite and / or pearlite can take place. Consequently, no or only small amounts of martensite are formed during a subsequent thermoforming process. Consequently, the portion of the first type has a high ductility.
  • the temperature is kept just high enough that in the subsequent thermoforming process sufficient martensite components are formed. Consequently, the partial area of the second type has lower ductility properties compared to the partial area of the first type, but higher strength.
  • WO 2005/009642 A1 shows a method in which a semifinished product from a high-strength boron steel with an Al / Si precoating in a cold forming process, in particular a drawing process, first formed into a component blank, then cut this component blank edge, then the trimmed component blank heated and then press-hardened in a hot-forming tool.
  • This press-hardened component blank is ultimately to be coated in a further coating step with a corrosion-protecting second layer.
  • the pre-coating ie an Al / Si (aluminum-containing) coating, prevents decarburization of the material during curing.
  • the pre-coating should avoid scaling during the hardening process, so that the Requirements for an inert atmosphere during curing can be reduced. In the case of Al / Si coatings, however, as a rule no inert atmosphere is necessary.
  • the invention is - based on the prior art - based on the object to provide a method for producing a molded component having at least two structural areas of different ductility, wherein on a scaling-based problems are avoided.
  • a first solution of the problem underlying the invention consists in the features of claim 1.
  • a material separated board first completely homogeneous heated to such a temperature and held for a certain time at this temperature level that forms a diffusion layer as corrosion relationship scale protection layer, wherein material from the coating diffuses into the base material.
  • the heating temperature is about 830 ° C to 950 ° C, preferably about 920 ° C.
  • This homogeneous heating is advantageously carried out in a first zone of a continuous furnace having a plurality of temperature zones.
  • a first type of board in a second zone of the furnace is cooled down to a temperature at which austenite decomposes. This is done at about 550 ° C to 700 ° C, preferably about 625 ° C. This lowered temperature level is maintained for a certain time, so that the decomposition of austenite also proceeds properly.
  • the temperature is kept just high enough in at least one area of the second type that sufficient martensite portions can still be formed in the subsequent hot forming in a corresponding press.
  • This temperature is 830 ° C to 950 ° C, preferably about 900 ° C.
  • the regions of the first and second types of the molded component have different ductility properties, with the region of the second type having a lower ductility compared to the first type, but higher strength properties.
  • the molded components produced in this way can be specifically adapted to specific requirements with regard to specific sections, to which they must comply in their capacity as structural component, for example as part of a vehicle body.
  • a second solution of the problem underlying the invention consists in the features of claim 2.
  • strip material from a high-strength boron steel provided with an Al / Si coating in a pre-furnace is continuously alloyed through in a first working step and then cooled.
  • the temperature is 830 ° C to 950 ° C, preferably about 920 ° C.
  • each severed board is transferred to a two-zone furnace.
  • a region of the second type of the board is austenitized at a temperature of about 830 ° C to 950 ° C, preferably about 930 ° C.
  • the area of the first kind is heated to a maximum temperature below the austenitizing temperature. This is about 550 ° C to 700 ° C, preferably about 680 ° C.
  • This type of heat treatment means that the regions of the second type of the molded components, which are ultimately produced from the boards in a thermoforming process, have low ductility properties compared to the regions of the first type, but higher strength properties.
  • a third solution of the problem underlying the invention consists in the features of claim 3.
  • each board in a second step in a Vorofen to a temperature of about 830 ° C to 950 ° C, preferably about 920 ° C, homogeneously heated, held for a certain time at this temperature level and then cooled again.
  • the formation of a diffusion layer takes place as a corrosion or scale protection layer from the Al / Si coating of the strip material.
  • each board is then transferred to a two-zone furnace and returned to a temperature of about 550 ° C to 700 ° C, preferably about 680 ° C, in a first zone of the furnace in a first zone of the furnace. heated.
  • a second type zone in a second zone of the furnace is heated to a temperature of 830 ° C to 950 ° C, preferably about 920 ° C.
  • the board is formed in a thermoforming process in a molding component.
  • the mold member then has lower ductility properties, but higher strength properties, with respect to the second type region compared to the first type region.
  • the local cooling of the area of the first type of board after heating can take place in that the area of the first type is briefly brought into contact with cooling jaws ,
  • this can be done according to claim 6, characterized in that nitrogen is used as the gas.
  • FIGS. 1 to 3 1 denotes a shaped component with two structural regions 2, 3 of different ductility.
  • the molded component 1 is the B-pillar of a vehicle body not otherwise shown.
  • the production of the molded component 1 takes place from a high-strength boron steel provided with an Al / Si coating.
  • a strip material 4 made of such a steel is according to FIG. 1 wrapped into a coil 5.
  • the strip material 4 is then withdrawn continuously from this coil 5 and passed through a punch 6.
  • In the punch 6 boards 7 are separated from the strip material 4 and these then fed to a three temperature zones 8, 9, 10 having continuous furnace 11.
  • each board 7 is heated to a temperature of about 830 ° C to 950 ° C, preferably 920 ° C, completely homogeneous and kept at this temperature level over a certain time t ( FIG. 2 ).
  • an area 12 of the first type of the board 7 in a second zone 9 of the continuous furnace 11 is cooled down to a temperature of about 550 ° C to 700 ° C, preferably about 625 ° C, and over a certain time t 1 at this lowered temperature level held.
  • an area 13 of the second type of the board 7 in a third zone 10 of the continuous furnace 11 is maintained at a temperature level of about 830 ° C. to 950 ° C., preferably about 900 ° C.
  • the heat-treated board 7 is then thermoformed in a press not shown in detail to the mold component 1.
  • the temperature profile over time in the passage of the board 7 through the continuous furnace 11 with respect to the first type area 12 and the second area 13 of the board 7 is shown, the lower curve 14, the heat treatment of the area 12 of the first kind , ie the temperature profile of the "soft" section of a board 7, and the upper curve 15 the heat treatment of the area 13 of the second kind, Consequently, the temperature profile of the "cured" section of a board 7, show.
  • FIG. 2 is a method for producing a molded component 1 with two structural areas 2, 3 illustrated different ductility, in which first strip material 4 is drawn from a provided with an Al / Si coating boron steel from a coil 5 and passed through a pre-furnace 16.
  • the strip material 4 is heated homogeneously to a temperature of about 830 ° C to 950 ° C, preferably about 920 ° C, and maintained at this temperature level for a certain time.
  • the thus heat-treated strip material 4 is wound into a coil 17. From this coil 17, the heat-treated strip material 4 is fed to a punch 18, where 4 blanks 7 are separated from the strip material.
  • the strip material 4 can also be cooled immediately after leaving the pre-furnace 16 and then fed to the punch 18.
  • These boards 7 from the pretreated strip material 4 are then transferred to a two-zone furnace 19 and herein in a first zone 20 of the furnace 19 at a temperature of about 550 ° C to 700 ° C, preferably in a first type zone 12 about 680 ° C, as well as with respect to a region 13 of the second kind at the same time in a second zone 21 of the furnace 19 to a temperature of about 830 ° C brought to 950 ° C.
  • the heat-treated blanks 7 in this manner are finally formed in a hot-forming process (not shown in detail) into shaped components 1 having two different structural regions 2, 3.
  • the lower curve 22 in the temperature-time diagram 23 of FIG. 2 shows in this connection the temperature profile in the area 12 of the first type of the board 7 and the upper curve 24 the temperature profile in the area 13 of the second type of each board 7.
  • FIG. 4 illustrates how strip material 4 made of boron steel provided with an Al / Si coating is drawn off a coil 5 and fed directly to a punch 18.
  • the punch 18 are from the strip material 4th Cut boards 7 and then fed to a pre-furnace 16, where the boards 7 are heated to a temperature of about 830 ° C to 950 ° C, preferably about 920 ° C, homogeneously and kept at a certain time t 2 at this temperature level.
  • the thus heat-treated blanks 7 are then transferred to the above-mentioned two-zone furnace 19 and here in the 1st zone 20 with respect to a region 12 of the first kind, as described, to a temperature of about 550 ° C to 700 ° C, preferably about 680 ° C, as well as with respect to a region 13 of the second kind at the same time brought in the second zone 21 of the furnace 19 to a temperature of about 830 ° C to 950 ° C.
  • the temperature-time graph 23 corresponds to that of FIG. 2 .
  • the thus heat-treated blanks 7 are finally formed in a thermoforming process to form components 1 with two different structural areas 2, 3.

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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)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Claims (6)

  1. Procédé pour fabriquer un composant moulé (1) comprenant au moins deux zones structurées (2, 3) à ductilité différente à partir d'une platine (7) métallique séparée d'un matériau en bande (4), dans lequel la platine (7) est chauffée différemment par endroits puis est soumise à un processus de moulage à chaud au moyen d'une mise en forme dans le composant moulé (1), caractérisé en ce que dans le cadre de l'application sur un composant moulé (1) composé d'un acier au bore hautement résistant pourvu d'un revêtement à base de Al-Si, une platine (7) séparée d'un matériau en bande (4) composé d'un matériau de ce type est chauffée de manière homogène à une température d'environ 830 °C - 950 °C en premier lieu dans une première zone (8) dans un four (11) présentant plusieurs zones de température (8, 9, 10) et est maintenue à ce niveau de température pendant une durée (t) déterminée, en ce qu'après une zone (12) du premier type de la platine (7) est refroidie à une température d'environ 550 °C - 700 °C dans une deuxième zone (9) du four (11) et est maintenue à ce niveau de température abaissée pendant une durée (t1) déterminée, et en ce que dans le même temps une zone (13) du deuxième type de la platine (7) est maintenue à un niveau de température d'environ 830 °C - 950 °C dans une troisième zone (10) du four (11) au cours d'une durée (t2), la platine (7) étant après quoi mise en forme en un composant moulé (1) lors d'un processus de moulage à chaud qui suit.
  2. Procédé pour fabriquer un composant moulé (1) comprenant au moins deux zones structurées (2, 3) à ductilité différente à partir d'une platine (7) métallique séparée d'un matériau en bande (4), dans lequel la platine (7) est chauffée par endroits différemment puis est soumise à un processus de moulage à chaud au moyen d'une mise en forme dans le composant moulé (1), caractérisé en ce que dans le cadre de l'application sur un composant moulé (1) composé d'un acier au bore hautement résistant pourvu d'un revêtement à base de Al-Si, le matériau en bande (4) composé d'un matériau de ce type est chauffé de manière homogène en continu dans un pré-four (16) à une température d'environ 830 °C - 950 °C, est maintenu à ce niveau de température pendant une durée déterminée puis est refroidi, des platines (7) étant après quoi séparées du matériau en bande (4), et en ce qu'après chaque platine (7) séparée du matériau en bande (4) est transférée dans un four à deux zones (19), est amenée, eu égard à une zone (12) du premier type, à une température d'environ 550 °C - 700 °C dans une première zone (20) du four (19) ainsi que dans le même temps, eu égard à une zone (13) du deuxième type, à une température d'environ 830 °C - 950 °C dans une deuxième zone (21) du four (19), et en ce que pour finir la platine (7) est mise en forme en le composant moulé (1) lors d'un processus de moulage à chaud.
  3. Procédé pour fabriquer un composant moulé (1) comprenant au moins deux zones structurées (2, 3) à ductilité différente à partir d'une platine (7) métallique séparée d'un matériau de bande (4), dans lequel la platine (7) est chauffée différemment par endroits puis est soumise à un processus de moulage à chaud au moyen d'une mise en forme dans le composant moulé (1), caractérisé en ce que dans le cadre de l'application sur un composant moulé (1) composé d'un acier au bore hautement résistant pourvu d'un revêtement à base de Al-Si, des platines (7) sont séparées d'un matériau en bande (4) composé d'un matériau de ce type, et en ce qu'après chaque platine (7) est chauffée de manière homogène dans un pré-four (16) à une température d'environ 830 °C - 950 °C, est maintenue également à ce niveau de température pendant une durée déterminée puis est refroidie, la platine (7) étant après quoi transférée dans un four à deux zones (19) et étant amenée, eu égard à une zone (12) du premier type, à une température d'environ 550 °C - 700 °C dans une première zone (20) du four (19) ainsi que dans le même temps, eu égard à une zone (13) du deuxième type, à une température d'environ 830 °C - 950 °C dans une deuxième zone (21) du four (19) et étant maintenue à ce niveau de température pendant une durée (t3), et en ce que pour finir la platine (7) ainsi traitée est mise en forme en le composant moulé (1) lors d'un processus de moulage à chaud.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'aux fins du refroidissement à une température d'environ 550 °C - 700 °C, la zone (12) du premier type de la platine (7) est amenée en contact brièvement avec des mâchoires de refroidissement.
  5. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'aux fins du refroidissement à une température d'environ 550 °C - 700 °C, un gaz refroidi est soufflé sur la zone (12) du premier type de la platine (7).
  6. Procédé selon la revendication 5, caractérisé en ce qu'aux fins du refroidissement à une température d'environ 550 °C - 700 °C, de l'azote est soufflé sur la zone (12) du premier type de la platine (7).
EP08854114.9A 2007-11-29 2008-11-03 Procédé de fabrication d'une pièce façonnée comprenant au moins deux zones structurelles à ductilité différente Active EP2227570B1 (fr)

Applications Claiming Priority (2)

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
PCT/DE2008/001799 WO2009067976A1 (fr) 2007-11-29 2008-11-03 Procédé de fabrication d'une pièce façonnée comprenant au moins deux zones structurelles à ductilité différente

Publications (2)

Publication Number Publication Date
EP2227570A1 EP2227570A1 (fr) 2010-09-15
EP2227570B1 true EP2227570B1 (fr) 2017-01-25

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EP08854114.9A Active EP2227570B1 (fr) 2007-11-29 2008-11-03 Procédé de fabrication d'une pièce façonnée comprenant au moins deux zones structurelles à ductilité différente

Country Status (7)

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

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WO2009067976A1 (fr) 2009-06-04
RU2010126492A (ru) 2012-01-10
EP2227570A1 (fr) 2010-09-15
RU2445381C1 (ru) 2012-03-20
CN101796202A (zh) 2010-08-04
US20100300584A1 (en) 2010-12-02
ES2620804T3 (es) 2017-06-29

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