WO2007121709A1 - Procede de fabrication d'un palier pivotant pour vehicule automobile avec une structure a coque - Google Patents

Procede de fabrication d'un palier pivotant pour vehicule automobile avec une structure a coque Download PDF

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Publication number
WO2007121709A1
WO2007121709A1 PCT/DE2007/000660 DE2007000660W WO2007121709A1 WO 2007121709 A1 WO2007121709 A1 WO 2007121709A1 DE 2007000660 W DE2007000660 W DE 2007000660W WO 2007121709 A1 WO2007121709 A1 WO 2007121709A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet metal
pivot bearing
forming tool
sheet
metal blank
Prior art date
Application number
PCT/DE2007/000660
Other languages
German (de)
English (en)
Inventor
Raphael Fischer
Peter Niebling
Ralf Hund
Original Assignee
Schaeffler Kg
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
Application filed by Schaeffler Kg filed Critical Schaeffler Kg
Publication of WO2007121709A1 publication Critical patent/WO2007121709A1/fr

Links

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
    • B21D53/90—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards axle-housings
    • 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
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/18—Steering knuckles; King pins

Definitions

  • the invention relates to a method for producing a motor vehicle pivot bearing in shell construction, wherein at least one half shell of the pivot bearing is produced from a sheet metal blank by deep-drawing forming in a forming tool with a mold space.
  • Swivel bearings for the front axle of a motor vehicle which are also referred to as wheel carriers, provide the connection between a damper or shock absorber leg, the wheel bearing and the control arm on the front axle of a motor vehicle.
  • the coupling of the control arm with the pivot bearing takes place via a pivot bearing formed on the pivot bearing.
  • Conventional pivot bearings are usually cast or forged, one-piece steel parts, which are made for example of a cast steel material or of cast aluminum material. It is therefore a solid component in which all functional surfaces have to be machined.
  • the damper strut is usually connected by means of a screw or clamp connection with the pivot bearing.
  • pivot bearing described therein offers a number of advantages over one-piece, massive pivot bearings or wheel carriers.
  • a pivot bearing by the use of thermoforming sheets on a low weight.
  • the material used namely a titanium-aluminum alloy, for example, TiAl6V4, very expensive, so that the advantages of a lightweight construction, the disadvantages of high material costs preclude.
  • DE 101 62 441 A1 discloses a method for producing motor vehicle parts, in particular chassis parts, body parts, drive parts, engine parts or the like, from metallic materials, in particular aluminum or aluminum alloys, in which high-pressure hot forming is provided by means of active media is produced in a forming tool with a mold space from an initial form an intermediate or final shape.
  • the mold space region is purposefully tempered by heat supply and / or heat removal by means of softening processes and solidification processes, wherein a forming tool with a partially heated or cooled mold space is used.
  • the hot forming is carried out by means of a hydroforming at temperatures between 150 ° C and 450 ° C. This should be one-piece motor vehicle components made particularly simple and inexpensive.
  • the method known from DE 101 62 441 A1 may bring advantages in a number of automotive components made of aluminum materials, but it is not necessarily transferable to the production of pivot bearings for motor vehicles. Because the geometry of a serving as Radisme- pivot bearing in shell construction can not be chosen arbitrarily due to the spatial boundary conditions, in particular clearance, acting forces of propeller shaft, brake, rim, tie rod, stabilizer or wishbone. The forces acting on the pivot bearing during operation give rise to typical critical areas in which voltage excesses occur, which can lead to premature fatigue cracks and fatigue fractures on the pivot bearing.
  • One way of reducing stress at these points could be a targeted material thickening, for example, by pre-processing of the sheet metal blank by rolling, a doubling or the use of so-called tailored blanks. However, this would lead to an increased production cost or an increased use of materials, which would nullify the advantages of a shell-type pivot bearing.
  • the invention has for its object to provide a method for producing a motor vehicle pivot bearing in shell construction, with which a pivot bearing can be produced easily and inexpensively, which is particularly resistant formed at the points of high force application.
  • the invention is based on the finding that the stated object can be achieved in a surprisingly simple manner by producing at least one half shell of the pivot bearing by hot forming in a forming tool consisting of die and male, at least one region of the formed sheet cured by cooling.
  • the invention is therefore based on a method for producing a motor vehicle pivot bearing or wheel carrier in shell construction, wherein at least one half shell of the pivot bearing is produced from a sheet metal blank by deep-drawing forming in a forming tool with a mold space.
  • the sheet metal blanket is heated, for example to a temperature above room temperature, that in a second step the sheet metal blank is inserted into the forming tool consisting of die and male part and the forming tool is closed with pressure.
  • the sheet may be cooled by, i. active or passive cooling, hardened.
  • the active cooling can be effected by means of a, in particular through the forming tool or through a part or through parts of the forming tool, guided coolant.
  • the passive cooling can be effected by a heat absorption of the forming tool or a part or parts of the forming tool.
  • the sheet can be rapidly and easily shaped into the desired shape by prior heating to a relatively high temperature in the forming tool, and that during selective cooling, in particular selective or selected and / or discrete or separate Areas of the sheet, preferably a sheet of a steel alloy, can achieve a so-called press hardening of these areas.
  • the sheet may also be selectively heated prior to forming, i.
  • areas of the sheet are heated to different temperatures and then cooled selectively or homogeneously during forming.
  • the steel structure is composed of chemically homogeneous areas, the phases.
  • the initial microstructure Upon heating in a high temperature range of approximately 700 ° C to 1000 0 C, the initial microstructure fully transforms into austenite. Preference is given to a temperature above 45O 0 C heated, more preferably to a temperature in the range of 700 ° C to 99O 0 C, preferably to a temperature of about 800 0 C.
  • the subsequent cooling of the desired areas, during which the austenite phase can be converted into the four different phases ferrite, perlite, banite and martensite, has a significant influence on the material properties.
  • the pearlite phase for example, has a low hardness and great formability, whereas martensite has a high external hardness, but also a certain brittleness.
  • the press-hardening of the initially austenitic sheet thus causes the setting of desired hardening of the pivot bearing produced by the method.
  • the material strength after forming in addition to the material composition of the sheet depends on parameters such as the cooling rate and the form fit, and these parameters are locally variable, according to the method, a targeted strength distribution can be generated in the workpiece, which in conjunction with the component geometry the stresses in Operation of a later component takes into account.
  • mass reduction can be achieved by optimizing the sheet thickness.
  • otherwise necessary preliminary work such as the thickening by means of rolling or welding of different sheet metal thicknesses of the sheet can be dispensed with.
  • a flexible design of the distribution of strength during production can be achieved, for example by selectively changing the forming parameters, in particular the temperatures and the pressures in the mold.
  • a coolant is fed into the forming tool for selective hardening of the areas to be hardened.
  • the areas with a resulting tensile strength R mm a ⁇ von 600 to 1400 MPa are cured.
  • the tensile strength R m max of 1400 MPa corresponds to an elongation at break of about 5%
  • the tensile strength R m m a x of 600 MPa corresponds to an elongation at break of about 20%.
  • the sheet metal blank is provided prior to insertion into the forming tool with a heatsink, said coating can be based on a further development of aluminum silicon or graphite.
  • at least two half shells produced according to the invention are connected to one another to form the pivot bearing or wheel carrier, wherein this configuration can be further expanded by welding the half shells together.
  • a further practical embodiment of the method according to the invention provides that a receptacle for a damper tube is formed on the pivot bearing, wherein the receptacle is formed by corresponding ein ⁇ ckige formations on the half-shells.
  • an embodiment of the invention is particularly advantageous, which is characterized in that a steel alloy is used as the material for the sheet metal blank.
  • Fig. 2 is a manufactured according to the method according to the figures 1a to 1d pivot bearing.
  • FIGS. 1a to 1d The sequence of a production method according to the invention is therefore shown schematically in FIGS. 1a to 1d.
  • a forming tool 1 is shown in cross section, which consists of a die 2 and a male part 3 or an embossing die.
  • a sheet metal plate 5 is inserted from sheet steel, which was heated to a temperature of ⁇ 800 ° C before inserting.
  • the sheet metal plate 5 forms after completion of the process, a half-shell of a motor vehicle pivot bearing or wheel carrier.
  • a mold space 8 is formed between top 6 of the male part 3 and the inside 7 of the die 2, between which the sheet metal plate 5 is arranged.
  • a coating which prevents surface Verzu the.
  • Such a coating may be based on aluminum-silicon or graphite.
  • a manufacturing state in which the forming tool 1 is closed by moving together of the die 2 and male part 3.
  • the still glowing hot sheet metal plate 5 has deformed according to the topographies of the die 2 and male part 3 to a half-shell 9 and fills the mold space 8 completely. Because the sheet metal blank 5 has been heated to a comparatively high temperature, the steel material of the sheet metal blank 5 is relatively soft, so that a smaller force must be used to close the forming tool 1 than in a cold forming method.
  • Fig. 1c the state of Fig. 1b is shown in more detail, wherein in dotted marked areas 10 and 11, which represent areas of high loads of the subsequent pivot bearing, cooling of the sheet half-shell 9 is carried out, thereby curing the sheet in these areas 10 and 11 to reach.
  • a cooling medium is fed into the forming tool 1 via lines not shown, whereby the temperature of the half-shell 9 is lowered to a value which is lower than the temperature of the remaining half-shell 9.
  • the (cooled) press-hardening of the areas 10 and 11 is the Half shell 9 formed and removed from the forming tool 1.
  • FIG. 1d A cross section through the finished and cooled half shell 9 is shown in Fig. 1d. Again, the now hardened areas 10, 11 are shown dotted. The hardness of these regions 10 and 11 is greater than the hardness of the remaining half-shell 9.
  • the half-shell 9 is welded with a second half-shell to a finished pivot bearing or Radisme-, where appropriate, other components can be welded or screwed to the pivot bearing.
  • a finished pivot bearing 12 is shown. This consists of two half-shells welded together, wherein in Fig. 2, only the half-shell 9 can be seen, while the other half-shell forms the back of the pivot bearing 12.
  • the pivot bearing 12 has, as usual, a steering lever 13, two tabs for brake connection 14 and 15, a wheel bearing receptacle 16 and a receptacle 17 for a damper tube of a shock absorber.
  • the receptacle 17 is in this case integrally formed on the pivot bearing 12, wherein the forming process took place in the forming tool 1.
  • both half-shells were provided with a corresponding depression, which together form the receptacle 17.
  • dotted areas 10, 11, 18 and 19 also indicate in FIG. 2 those areas which were hardened during the manufacturing process according to the invention by targeted cooling. These areas 10, 11, 18 and 19 represent those areas in which otherwise particularly high mechanical stresses prevail. Outside of these areas 10, 11, 18 and 19, the material hardness is lower in favor of a higher material toughness.

Abstract

L'invention concerne un procédé de fabrication d'un palier pivotant (12) pour un véhicule automobile avec une structure à coque, au moins une demi-coque (9) du palier pivotant (12) étant fabriquée à partir d'une plaque de tôle (5) par façonnage par emboutissage dans un outil de façonnage (1) avec un espace de formage (8). Afin de permettre une fabrication simplifiée d'un palier pivotant avec des propriétés améliorées, la plaque de tôle (5), conformément à l'invention, est chauffée dans une première étape et dans une deuxième étape, la plaque de tôle (5) est introduite dans l'outil de façonnage (1) constitué d'une matrice (2) et d'un poinçon (3), puis l'outil de façonnage (1) est fermé avec application de pression.
PCT/DE2007/000660 2006-04-22 2007-04-17 Procede de fabrication d'un palier pivotant pour vehicule automobile avec une structure a coque WO2007121709A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006018809.8 2006-04-22
DE200610018809 DE102006018809A1 (de) 2006-04-22 2006-04-22 Verfahren zur Herstellung eines Kraftfahrzeug-Schwenklagers in Schalenbauweise

Publications (1)

Publication Number Publication Date
WO2007121709A1 true WO2007121709A1 (fr) 2007-11-01

Family

ID=38325206

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2007/000660 WO2007121709A1 (fr) 2006-04-22 2007-04-17 Procede de fabrication d'un palier pivotant pour vehicule automobile avec une structure a coque

Country Status (2)

Country Link
DE (1) DE102006018809A1 (fr)
WO (1) WO2007121709A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006060898B4 (de) * 2006-12-21 2013-12-05 Braun CarTec GmbH Verbundlenkerhinterachse
DE102006060897B4 (de) * 2006-12-21 2015-06-18 Hfs Hotforming Solutions Gmbh Vorderachsenbaugruppe
DE102011007831A1 (de) * 2011-04-21 2012-10-25 Zf Friedrichshafen Ag Kraftfahrzeug mit zumindest einer radabstützenden Baueinheit
EP2562034B1 (fr) 2011-08-25 2017-10-04 Adient Luxembourg Holding S.à r.l. Composant profilé d'un siège de véhicule, procédé et dispositif destinés à la fabrication d'un composant profilé
WO2017157379A1 (fr) * 2016-03-14 2017-09-21 Ksm Castings Group Gmbh Procédé de fabrication d'un support de roue traité thermiquement comprenant un palier de roue
FR3064936B1 (fr) * 2017-04-07 2019-04-26 Peugeot Citroen Automobiles Sa Triangle ou bras de suspension pour vehicule automobile realise par emboutissage a chaud et soudure laser

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH673603A5 (en) * 1987-09-22 1990-03-30 Alusuisse Press blowing super-plastically deformable metal sheet - using cooling nozzle to decrease metal expansion in areas to be most highly deformed
DE19915633A1 (de) * 1999-04-07 2000-10-12 Volkswagen Ag Schwenklager
DE10128199A1 (de) * 2001-06-11 2002-12-19 Benteler Automobiltechnik Gmbh Vorrichtung zur Umformung von Metallblechen
DE10162441A1 (de) * 2001-12-19 2003-07-03 Bayerische Motoren Werke Ag Verfahren zum Herstellen von Kfz-Bauteilen
DE10233911A1 (de) * 2002-07-25 2004-02-19 Webasto Vehicle Systems International Gmbh Werkzeug und Verfahren zum Umformen von lackierten Blechen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE435527B (sv) * 1973-11-06 1984-10-01 Plannja Ab Forfarande for framstellning av en detalj av herdat stal
DE19653543A1 (de) * 1996-12-20 1998-06-25 Audi Ag Verfahren zum Herstellen eines Blechformteiles durch Tiefziehen
DE102004038626B3 (de) * 2004-08-09 2006-02-02 Voestalpine Motion Gmbh Verfahren zum Herstellen von gehärteten Bauteilen aus Stahlblech

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH673603A5 (en) * 1987-09-22 1990-03-30 Alusuisse Press blowing super-plastically deformable metal sheet - using cooling nozzle to decrease metal expansion in areas to be most highly deformed
DE19915633A1 (de) * 1999-04-07 2000-10-12 Volkswagen Ag Schwenklager
DE10128199A1 (de) * 2001-06-11 2002-12-19 Benteler Automobiltechnik Gmbh Vorrichtung zur Umformung von Metallblechen
DE10162441A1 (de) * 2001-12-19 2003-07-03 Bayerische Motoren Werke Ag Verfahren zum Herstellen von Kfz-Bauteilen
DE10233911A1 (de) * 2002-07-25 2004-02-19 Webasto Vehicle Systems International Gmbh Werkzeug und Verfahren zum Umformen von lackierten Blechen

Also Published As

Publication number Publication date
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