EP2734652B1 - Procédé de production d'un élément structural par formage à chaud d'un produit primaire en acier - Google Patents

Procédé de production d'un élément structural par formage à chaud d'un produit primaire en acier Download PDF

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Publication number
EP2734652B1
EP2734652B1 EP12750986.7A EP12750986A EP2734652B1 EP 2734652 B1 EP2734652 B1 EP 2734652B1 EP 12750986 A EP12750986 A EP 12750986A EP 2734652 B1 EP2734652 B1 EP 2734652B1
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EP
European Patent Office
Prior art keywords
forming
component
mill bar
hot
strength
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.)
Active
Application number
EP12750986.7A
Other languages
German (de)
English (en)
Other versions
EP2734652A1 (fr
Inventor
Thomas Evertz
Volker Flaxa
Michael Braun
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.)
Salzgitter Flachstahl GmbH
Original Assignee
Salzgitter Flachstahl GmbH
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Filing date
Publication date
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Publication of EP2734652A1 publication Critical patent/EP2734652A1/fr
Application granted granted Critical
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Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/024—Forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • 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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B21B2001/383—Cladded or coated products
    • 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

Definitions

  • the invention relates to a method for producing a component by hot forming a precursor of steel according to the preamble of claim 1.
  • precursors sheet metal plates are understood.
  • Such components are mainly used in the automotive industry, but also in mechanical engineering or construction can be used.
  • the primary suppliers are trying to meet this need by reducing the wall thickness by providing high-strength and ultra-high-strength steels, while at the same time improving component behavior during production and operation.
  • the board is cut to fit the hot forming forming tool. It is also possible to provide the respective workpiece to be formed, or the blank, with a hot-dip coating.
  • the application of a metallic coating on the preform to be formed prior to hot forming is advantageous in this method because the coating effectively prevents scaling of the base material and, due to an additional lubricating effect, excessive tool wear.
  • thermoformable steels for this application are z. B. the manganese-boron steel "22MnB5" and recently also air hardenable steels according to a still unpublished patent application of the applicant.
  • this process requires a great deal of energy by heating the precursor to austenitizing temperature and converting ferrite into austenite, which makes the process expensive and produces significant amounts of CO 2 .
  • an additional metallic protective layer or a protective layer Lacquer base required or a considerable rework of the scale-hardened by heating and reshaping.
  • a further disadvantage is that to obtain appropriate component strengths after press hardening only convertible steels can be used with a sufficient conversion inertia, which must have correspondingly expensive alloying additions for the structure to be achieved and hardness after forming.
  • the object of the invention is to provide a method for producing a component by hot working, which is inexpensive and can be achieved with the comparable or improved properties of the formed component as in the known hot forming by press hardening.
  • this object is achieved by a method in which in the course of the process, the heating of the precursor takes place at a temperature below the Ac 1 conversion temperature and the precursor undergoes an increase in strength by cold forming prior to heating.
  • the inventive method has opposite to that of DE 601 19 826 T2 known method for producing a component on the advantage that at significantly lower energy consumption for heating the component strength after forming in the Substantially achieved by the previously introduced into the precursor Kaltverfestist. This saves energy and alloying costs.
  • the introduced dislocations lead to a considerable increase in strength, which is only insignificantly reduced by the heating process, so that the strength of the component can be adjusted in a targeted manner.
  • Experiments have also shown that the ductility of the finished component compared to a component produced by press-hardening could be significantly increased.
  • the degree of cold work not less than 3% should not be less than 5% advantageous depending on the material used in the precursor.
  • Forming degrees which have been found to be advantageous in the case of hot-rolled strip are between about 3% and about 50% to 80% between conventional temper rolling.
  • the invention is easily applicable even at the high degrees of cold rolling.
  • cold work grades in the range of 5 to 35% have proven excellent.
  • the invention is applicable to precursors of soft to high strength steels, eg. B. with yield strengths of 140 MPa to 1200 MPa, which may be provided with a scale or corrosion inhibiting layer as a metallic coating.
  • the metallic coating may contain Zn and / or Mg and / or Al and / or Si.
  • surface-finished hot strip can already be used for forming following heating, since the adhesion and the ductility endure half-hot forming with low degrees of deformation.
  • the metallic coating is resistant to short-term reheating of the substrate / coating combination (steel strip / coating) below the Ac 1 temperature of the substrate to survive reheating prior to semi-hot forming and actual semi-hot forming.
  • the reheating takes place before the half-warm forms by means of radiation, since the efficiency is significantly higher than when heated in an oven or conductive heating and the energy input into the material takes place faster and more effective depending on the surface condition.
  • the cold-formed intermediate product is advantageously heated to a temperature of below 720 ° C. in a temperature range of 400-700 ° C. and then shaped into a component.
  • the optimum forming temperature depends on the required strength of the component and is preferably between about 540 ° C and 700 ° C.
  • a further increase in strength is achieved during the pressing process and the subsequent cooling by the so-called “bake-hardening effect" or by an additional excretion formation, eg. B. VC, allows.
  • the increase in strength can be achieved by controlled cooling or subsequent heat treatment (eg paint baking or stress relief annealing).
  • a local exceeding of the temperature range of the Semi-warm forming in the austenitizing made in order to make specific local property changes (eg local hardening), which are adapted to the subsequent stresses of the component in combination with the increase in strength of the remaining material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Articles (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating With Molten Metal (AREA)

Claims (10)

  1. Procédé de production d'un élément structurel par formage à chaud d'une platine d'acier découpée dans un feuillard à chaud, dans lequel la platine est chauffée à la température de formage et est ensuite façonnée,
    caractérisé en ce que,
    le chauffage se fait à une température en dessous de la température de conversion de Ac1 et la platine subit avant le chauffage une augmentation de résistance par laminage à froid, dans lequel elle est façonnée avec un degré de formage lors du laminage à froid d'au moins 3 %.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la platine est façonnée avec un degré de formage à froid d'au moins 5 %.
  3. Procédé selon la revendication 2,
    caractérisé en ce que
    la platine est façonnée avec un degré de formage à froid d'au moins 5 à 35 %.
  4. Procédé selon au moins l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    le chauffage de la platine se fait à une température inférieure à 720 °C.
  5. Procédé selon la revendication 4,
    caractérisé en ce que
    le chauffage de la platine se fait dans une plage de températures de 400 à 700 °C.
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    le chauffage de la platine se fait dans une plage de températures de 540 à 700 °C.
  7. Procédé selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    la platine est pourvue avant le chauffage d'un revêtement métallique ou de type vernis.
  8. Procédé selon la revendication 7,
    caractérisé en ce que
    la platine est pourvue avant le formage à froid d'un revêtement métallique ou de type vernis.
  9. Procédé selon la revendication 7 ou 8,
    caractérisé en ce que
    le revêtement métallique contient du Zn et/ou du Mg et/ou de l'Al et/ou du Si,
  10. Procédé selon au moins l'une quelconque des revendications 1 à 9,
    caractérisé en ce que
    le chauffage se fait à la température de formage par voie inductive, conductrice ou au moyen d'un rayonnement.
EP12750986.7A 2011-07-20 2012-07-04 Procédé de production d'un élément structural par formage à chaud d'un produit primaire en acier Active EP2734652B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011108162A DE102011108162B4 (de) 2011-07-20 2011-07-20 Verfahren zur Herstellung eines Bauteils durch Warmumformen eines Vorproduktes aus Stahl
PCT/DE2012/000685 WO2013010524A1 (fr) 2011-07-20 2012-07-04 Procédé de production d'un élément structural par formage à chaud d'un produit primaire en acier

Publications (2)

Publication Number Publication Date
EP2734652A1 EP2734652A1 (fr) 2014-05-28
EP2734652B1 true EP2734652B1 (fr) 2018-12-12

Family

ID=46750134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12750986.7A Active EP2734652B1 (fr) 2011-07-20 2012-07-04 Procédé de production d'un élément structural par formage à chaud d'un produit primaire en acier

Country Status (6)

Country Link
US (1) US9943894B2 (fr)
EP (1) EP2734652B1 (fr)
KR (1) KR102006963B1 (fr)
DE (1) DE102011108162B4 (fr)
RU (1) RU2581948C2 (fr)
WO (1) WO2013010524A1 (fr)

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DE102012006941B4 (de) * 2012-03-30 2013-10-17 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines Bauteils aus Stahl durch Warmumformen
US10260124B2 (en) 2013-05-14 2019-04-16 Nippon Steel & Sumitomo Metal Corporation Hot-rolled steel sheet and manufacturing method thereof
DE102013009232A1 (de) 2013-05-28 2014-12-04 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines Bauteils durch Warmumformen eines Vorproduktes aus Stahl
AT514422B1 (de) * 2013-11-05 2015-01-15 Böhler Profil Gmbh Verfahren zur Herstellung von Schneidmessern
JP6582892B2 (ja) * 2015-11-04 2019-10-02 日本製鉄株式会社 鋼材の熱間圧延方法
DE102016104800A1 (de) 2016-03-15 2017-09-21 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines warmumgeformten Stahlbauteils und ein warmumgeformtes Stahlbauteil
DE102017124724B4 (de) 2016-10-25 2022-01-05 Koki Technik Transmission Systems Gmbh Verfahren zur Herstellung einer Schaltgabel
DE102016222961A1 (de) 2016-11-22 2018-05-24 Volkswagen Aktiengesellschaft Verfahren zur Warmumformung von Stahlbauteilen und Fahrzeug

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Also Published As

Publication number Publication date
KR102006963B1 (ko) 2019-08-02
EP2734652A1 (fr) 2014-05-28
KR20140050041A (ko) 2014-04-28
US9943894B2 (en) 2018-04-17
DE102011108162A1 (de) 2013-01-24
DE102011108162B4 (de) 2013-02-21
RU2581948C2 (ru) 2016-04-20
RU2014106307A (ru) 2015-08-27
US20140290322A1 (en) 2014-10-02
WO2013010524A1 (fr) 2013-01-24

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