EP2446977B1 - Procédé de fabrication d'un profilé tubulaire - Google Patents

Procédé de fabrication d'un profilé tubulaire Download PDF

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Publication number
EP2446977B1
EP2446977B1 EP11005966.4A EP11005966A EP2446977B1 EP 2446977 B1 EP2446977 B1 EP 2446977B1 EP 11005966 A EP11005966 A EP 11005966A EP 2446977 B1 EP2446977 B1 EP 2446977B1
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EP
European Patent Office
Prior art keywords
tubular profile
mpa
section
region
tool
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
EP11005966.4A
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German (de)
English (en)
Other versions
EP2446977A1 (fr
Inventor
Markus Löcker
Rolf Schwarzer
Stefan Arpad Szabo
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.)
Kirchhoff Automotive Deutschland GmbH
Original Assignee
Kirchhoff Automotive Deutschland 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.)
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Publication date
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Publication of EP2446977A1 publication Critical patent/EP2446977A1/fr
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Publication of EP2446977B1 publication Critical patent/EP2446977B1/fr
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Classifications

    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • 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
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/025—Stamping using rigid devices or tools for tubular articles
    • 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
    • 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
    • C21D9/0068—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
    • 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
    • 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
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/01—End parts (e.g. leading, trailing end)
    • 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
    • C21D2221/02—Edge parts

Definitions

  • the invention relates to a method for producing a tubular profile as a composite beam axis of a motor vehicle associated crossmember for the torsion beam axle of a motor vehicle.
  • Pipe profiles as cross members for composite beam axes are known in the art. It will do this, for example, on the EP 0 752 332 A1 directed.
  • Such a known tubular profile has circular tubular sections at both ends.
  • a double-walled U-shaped channel section is formed by forming.
  • the transition areas between the circular ends and the U-shaped central part go continuously from circular to the U-shaped cross section over. It can additionally be provided in the end regions between the transition areas and the U-shaped longitudinal area an inward or outward indentation.
  • a method for producing such a pipe profile is in EP 1 577 404 B1 described.
  • a tube of case steel is first cold formed and then subjected to a heat treatment, wherein after the heat treatment, a quenching and surface hardening takes place.
  • DE 10 2007 002 448 shows a method for producing a Torsionsprofils of a circular cross-section metallic tube.
  • a Torsionsprofils of a circular cross-section metallic tube After the insertion of cylindrical support mandrels in the circumferentially guided pipe ends of lying between the pipe ends, supported in a receiving tray center area U-shaped formed.
  • the tube ends are loaded with axial pressure, so that a supply of material takes place in the direction of the central area.
  • WO 2004/033126 discloses a method for the production of metallic mold components, in particular for bodies. Here, first a cold forming to form a blank, which is then cut to size. Finally, the blank is heated and press hardened.
  • the DE 10 2004 046 119 discloses a one-piece formed by deformation sheet metal blank having defined zones of different strength. This can in particular be produced by first heating to microstructure transformation temperature and then shaping and cooling. The cooling rate controls the strength of the corresponding zone.
  • the present invention seeks to provide an alternative method for producing such pipe profiles, which also can be carried out particularly inexpensive and easy to handle.
  • the invention proposes a method for producing a tubular profile as a cross member for a torsion beam axle of a motor vehicle, in which a tube is austenitized from an air-hardening steel in a first process step, in a second process step while maintaining the ends with a circular cross-section the middle region is converted into a U-shaped cross-section in a one-stage or two-stage manner by means of a tool upper and lower part, wherein the transitional regions between the circular ends and the central region pass continuously from circular to U-shaped cross section without tool contact or only with lower side, one-sided tool contact to be reshaped.
  • the ears formed during the deformation of the central region at the edges of the U-shaped cross section be held during the forming free of contact of the tool top and bottom.
  • press-hardening it is also preferable under certain circumstances for press-hardening to be carried out by hot-forming or simultaneously with the forging in the central region by cooling the upper and lower parts of the tool.
  • the formed tubular profile is cooled to room temperature in air after the forming step.
  • the deformed tube profile is cooled after the forming step with water mist.
  • the tube profile to be produced by means of hot forming, optionally press hardening and subsequent cooling and simultaneous self-annealing in air and / or with water mist has in each case a circular cross section at its ends.
  • the hot forming in the tool in a one- or two-stage process by means of a tool upper part and lower tool part a U-shaped cross section is generated in the central region.
  • the lower tool part supports the pipe section only in the central region to be formed, while the upper tool part is also provided only in the central region and acts on the pipe section.
  • the tool lower part trough-shaped according to Target contour of the finished pipe section may be formed in the central region, while the upper tool part is a trough-shaped punch, which has the contour of the central region of the pipe section to be generated.
  • the transitions between the circular cross-section at the ends and the U-shaped cross-section in the central region are continuous over from one to the other cross section. Due to the hot forming and direct contact of the upper and lower tool parts in the central U-shaped cross section and the resulting higher cooling rates and the resulting lower temperatures on the pipe profile, higher strengths of at least 800 MPa, preferably 1000 MPa are achieved in this area than in the ears at the edges of the U-shaped cross section. This also applies to the circular cross sections at the ends. Here, too, a strength of at least 800 MPa, preferably 1000 MPa, is achieved, since a mandrel is introduced into the pipe at the pipe ends to support the shaping and supports the pipe ends from the inside. Again, the effect described is achieved by the direct contact of the mandrels with the pipe ends.
  • air-hardening steel qualities are preferably available worldwide steel grades such as LH800 / 900 and MW 1000L is used. Details of these steels are for example the material sheet " air hardenable tempered steel ", in hot and cold rolled version, issue November 2006 (first edition ) the Salzgitter Flachstahl AG or the material sheet 049 R, January 2009 issue, Salzgitter Mannesmann Reczisi on.
  • the cooling of the formed tube profile can be done in the simplest form in air to room temperature.
  • the cooling can also take place in the forming tool and then continue in air or the cooling can be accelerated by a water mist.
  • the special effect in the forming is that in the areas in which a direct contact with tool parts or the like takes place, a higher strength is achieved while in In areas where there is no direct contact with tools or tool parts, a higher ductility during subsequent tempering is achieved.
  • the material of the pipe profile is coated to prevent corrosion before Austenitmaschine.
  • the austenitizing tube profile is galvanized or provided with an aluminum-silicon coating or generally with an anticorrosive coating
  • the deformation of the pipe profile can be done directly without inert gas.
  • austenitization and hot forming are carried out under a protective gas atmosphere.
  • a tube profile made of suitable air-hardening steel can be used, which is not corrosion-coated.
  • the protective gas atmosphere prevents the ingress of oxygen and thus avoids undesired oxidation or scaling of the material.
  • the tube profile is heated to 930 ° C and over several minutes on this Temperature is maintained before the hot forming is performed immediately thereafter.
  • the heating of the tube profile to Austenitmaschinestemperatur can be done for example in an oven or continuous furnace, or conductive or inductive.
  • the heat treatment for the purpose of austenitizing at 930 ° C under nitrogen atmosphere, wherein the heat treatment is carried out for at least thirteen minutes, so that the desired component temperature is achieved.
  • About a sealed removal and feeding the heated workpiece is fed to the two-stage hot forming, which reaches a defined material temperature before each forming process and in which there is a partial cooling of the component in the tool. Due to the protective gas atmosphere, the formation of scale is avoided.
  • the final cooling preferably at open air, to room temperature, a higher ductility in the radii and transitions is achieved by lower cooling rates.
  • the deformed tube profile is blasted after cooling.
  • the deformed tube profile with glass beads, dry ice or balls, in particular steel balls or grains is blasted.
  • the corresponding blasting treatment removes residual scale and achieves surface compaction. Subsequently, a coating can take place in the KTL process.
  • the invention further relates to a tubular profile as a cross member for a torsion beam axle of a motor vehicle, consisting of a tubular profile with circular cross-section at the two ends, a middle double-walled U-shaped portion and transition portions which merge continuously from the circular ends in the U-shaped region.
  • the invention proposes that the pipe profile consists of air-hardening steel having at the two ends a ring zone (a) with a strength of more than 800 MPa, preferably more than 1000 MPa , in the transition region (b) between the ends (a) and the U-shaped region (c) has a strength of at least 500 MPa to at most 800 MPa, in the U-shaped region (c) has a strength of at least 800 MPa, preferably at least 1000 MPa, and in the area of the ear-shaped edges of U-shaped area (c) a strength of 550 to 750 MPa.
  • the invention further provides a pipe profile according to claim 11, produced by the method according to one of claims 1 to 10.
  • the drawing figures show a finished tube profile, which is produced by the method according to the invention.
  • the area over which these circular sections extend is indicated by a.
  • This area a is followed by another area b.
  • This area b is a transitional section continuously from the Section a in the U-shaped central area c passes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (12)

  1. Procédé de fabrication d'un profilé tubulaire en tant qu'essieu à traverse déformable en torsion d'un véhicule à moteur faisant partie d'une traverse pour un essieu à traverse déformable en torsion d'un véhicule à moteur, lors duquel un tube en acier durci à l'air est, au cours d'une première étape de procédé, austénitisé, au cours d'une seconde étape, la zone centrale (2, 3) est, en une ou deux phases, déformée à chaud en section en U en conservant les extrémités (1) avec une section ronde, à l'aide d'une partie supérieure et d'une partie inférieure d'un outil, les zones de transition (b) entre les extrémités rondes (1) et la zone centrale (2, 3) étant déformées en passant de manière continue de la section ronde à la section en forme de U, sans contact avec un outil ou uniquement avec un contact unilatéral avec l'outil du côté inférieur.
  2. Procédé selon la revendication 1, caractérisé en ce que les oreilles (3a) formés lors de la déformation de la zone centrale (2, 3) sur les bords de la section en forme de U sont maintenues pendant la déformation sans contact avec la partie supérieure et la partie inférieure de l'outil.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, à la suite de la déformation à chaud ou simultanément à la déformation à chaud de la zone centrale, il se produit un durcissement à la presse, par refroidissement de la partie supérieure et de la partie inférieure de l'outil.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le profil tubulaire déformé est, à la suite de l'étape de déformation, refroidi à l'air jusqu'à la température ambiante.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le profilé tubulaire déformé est, à la suite de l'étape de déformation, refroidi avec un brouillard d'eau.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le matériau du profilé tubulaire est recouvert d'une couche anti-corrosion avant l'austénitisation.
  7. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que l'austénitisation et la déformation à chaud sont réalisées sous atmosphère gazeuse protégée.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que le profilé tubulaire est réchauffé à environ 930 °C et que cette température est maintenue pendant plusieurs minutes, avant que la déformation à chaud soit réalisée juste après.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que le profilé tubulaire déformé est grenaillé après refroidissement.
  10. Procédé selon la revendication 9, caractérisé en ce que le profilé tubulaire déformé est grenaillé avec des perles de verre, du riz sec ou des billes, notamment des billes d'acier ou un abrasif angulaire.
  11. Profilé tubulaire en tant que traverse pour un essieu à traverse déformable en torsion d'un véhicule à moteur, constitué d'un profilé tubulaire avec une section ronde (1) aux deux extrémités, une zone centrale à double paroi en forme de U (2, 3) et des tronçons de transition qui passent de manière continue des extrémités rondes (1) à la zone en forme de U (2, 3), caractérisé en ce que le profilé tubulaire est constitué d'acier durci à l'air, présente aux deux extrémités une zone circulaire (a) avec une dureté de plus de 800 MPa, de préférence de plus de 1000 MPA, présente dans la zone de transition (b) entre les extrémités (a) et la zone en forme de U (c) une dureté d'au moins 500 MPa jusqu'à un maximum de 800 MPa, présente dans la zone en forme de U (C) une dureté d'au moins 800 MPa, de préférence de 1000 MPa, et présente dans la zone des bords (3a) en forme d'oreille de la zone (c) en forme de U, une dureté de 550 à 750 MPa.
  12. Profilé tubulaire selon la revendication 11, fabriqué à l'aide du procédé de fabrication selon l'une des revendications 1 à 10.
EP11005966.4A 2010-11-02 2011-07-21 Procédé de fabrication d'un profilé tubulaire Active EP2446977B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010050248.0A DE102010050248B4 (de) 2010-11-02 2010-11-02 Verfahren zur Herstellung eines Rohrprofils

Publications (2)

Publication Number Publication Date
EP2446977A1 EP2446977A1 (fr) 2012-05-02
EP2446977B1 true EP2446977B1 (fr) 2019-06-26

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EP11005966.4A Active EP2446977B1 (fr) 2010-11-02 2011-07-21 Procédé de fabrication d'un profilé tubulaire

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EP (1) EP2446977B1 (fr)
DE (1) DE102010050248B4 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2708294B1 (fr) * 2012-09-13 2018-11-07 Johannes Meier Werkzeugbau GmbH Procédé de fabrication d'un profil de torsion
DE102013005831B4 (de) * 2013-04-04 2020-11-05 Manuela Braun Warmumformvorrichtung
DE102014109453A1 (de) * 2014-07-07 2016-01-07 Benteler Automobiltechnik Gmbh Verfahren zum Herstellen eines Torsionsprofils aus einem rohrförmigen Hohlprofil sowie Torsionsprofil
CN104492902A (zh) * 2014-12-08 2015-04-08 无锡朗贤汽车组件研发中心有限公司 等截面硼钢钢管的热成形及水冷工艺生产设备
CN105619025A (zh) * 2015-12-30 2016-06-01 浙江吉利汽车研究院有限公司 一种高强度耐疲劳扭力梁的热成形方法
JP6893637B2 (ja) * 2017-07-27 2021-06-23 株式会社ワイテック 車両のトーションビーム構造
DE102017223374A1 (de) 2017-12-20 2019-06-27 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Herstellung eines Profilbauteils sowie Profilbauteil
DE102020100461B4 (de) 2020-01-10 2024-11-28 Gottfried Wilhelm Leibniz Universität Hannover Verfahren zum Bearbeiten eines Metallrohrs

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DE59500210D1 (de) 1995-06-30 1997-06-05 Benteler Werke Ag Verbundlenkerhinterachse
DE19941993C1 (de) 1999-09-02 2000-12-14 Benteler Werke Ag Verfahren zur Herstellung eines biegesteifen torsionsweichen Rohrprofils als Querträger für eine Verbundlenkerhinterachse eines Personenkraftwagens
JP4319987B2 (ja) * 2002-09-13 2009-08-26 ダイムラー・アクチェンゲゼルシャフト プレス焼入れされた部品及びそれを製造する方法
DE102004046119A1 (de) * 2004-09-23 2006-04-06 Universität Kassel Einteiliges, durch Umformung hergestelltes Blechhalbzeug und Verfahren zur Herstellung eines einteiligen Blechhalbzeuges
DE102004053620A1 (de) * 2004-11-03 2006-05-04 Salzgitter Flachstahl Gmbh Hochfester, lufthärtender Stahl mit ausgezeichneten Umformeigenschaften
DE102007002448B4 (de) * 2007-01-11 2015-04-09 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Torsionsprofils und Vorrichtung zur Durchführung des Verfahrens
DE102007062220A1 (de) * 2007-12-21 2009-06-25 GM Global Technology Operations, Inc., Detroit Querträger einer Verbundlenkerachse
DE102010024664A1 (de) * 2009-06-29 2011-02-17 Salzgitter Flachstahl Gmbh Verfahren zum Herstellen eines Bauteils aus einem lufthärtbaren Stahl und ein damit hergestelltes Bauteil

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Also Published As

Publication number Publication date
DE102010050248A1 (de) 2012-05-03
DE102010050248B4 (de) 2016-08-04
EP2446977A1 (fr) 2012-05-02

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