EP2108469B1 - Procédé de fabrication d'un corps d'axe constitué de profilés installés les uns contre les autres - Google Patents

Procédé de fabrication d'un corps d'axe constitué de profilés installés les uns contre les autres Download PDF

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Publication number
EP2108469B1
EP2108469B1 EP08006947A EP08006947A EP2108469B1 EP 2108469 B1 EP2108469 B1 EP 2108469B1 EP 08006947 A EP08006947 A EP 08006947A EP 08006947 A EP08006947 A EP 08006947A EP 2108469 B1 EP2108469 B1 EP 2108469B1
Authority
EP
European Patent Office
Prior art keywords
corner
curvature
profile
rounded
die
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.)
Not-in-force
Application number
EP08006947A
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German (de)
English (en)
Other versions
EP2108469A1 (fr
Inventor
Helmut Steiner
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.)
BPW Bergische Achsen KG
Original Assignee
BPW Bergische Achsen 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 BPW Bergische Achsen KG filed Critical BPW Bergische Achsen KG
Priority to EP08006947A priority Critical patent/EP2108469B1/fr
Priority to AT08006947T priority patent/ATE473816T1/de
Priority to DE502008000939T priority patent/DE502008000939D1/de
Publication of EP2108469A1 publication Critical patent/EP2108469A1/fr
Application granted granted Critical
Publication of EP2108469B1 publication Critical patent/EP2108469B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B21D53/90—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards axle-housings

Definitions

  • the invention relates to a method for producing an offset from each other profiles axle body of closed cross section with mutually perpendicular profile sections, wherein the corner regions between the profile sections are rounded, and the wall thicknesses are increased in the corner regions relative to the wall thickness in the other profile sections, according to The preamble of claim 1 (see, eg JP-A-04210831 ).
  • a strip of sheet steel is rolled with a plurality of spaced-apart thickenings, wherein the distance of these thickenings corresponds to the edge length of the later axle body.
  • the thus rolled sheet metal strip is then formed into a circular cross-section tube, and its abutting edges are welded together by a longitudinal seam.
  • the round cross section of the tube is rolled in several stages to the rectangular end cross section of the finished axle body.
  • the aim of the invention is a simplified production of rectangular axle bodies with wall thickness reinforcements in the corner areas.
  • the curvature of the inner corner of the outer die is related to a different center of curvature, as the curvature of the outer corner of the inner die.
  • the center of curvature of the outer corner is further away from the inner corner than the center of curvature of the inner corner.
  • the bends are each circular sections, and the centers of curvature are each the radius centers of the circular sections.
  • a preferred embodiment of the method provides that the material arranged in the corner region, at least during the upsetting, has a higher temperature than the material in the other profile sections.
  • FIG. 1 illustrated air suspension axle of a trailer vehicle are mounted under a vehicle frame 2 supports 3, where designed as springs trailing arm 8 are mounted for the axle body 1 of the vehicle axle.
  • the axle body 1 is fastened transversely to the trailing arms 8 by way of various connecting elements.
  • the axle body 1 is here a continuously formed axle body. It therefore extends transversely to the vehicle from one side of the vehicle to the other. At its ends, the axle body 1 is provided with stub axles, on each of which the vehicle wheels 10 are mounted.
  • the axle body 1 is arranged under a front, higher-lying spring load of the trailing arm 8, while the air spring bellows 9 are supported on lower-lying, rear spring branches of the respective trailing arm 8. Between the supports 3 and the axle body 1, a shock absorber is arranged on each side.
  • the designed as a closed rectangular and especially square tube axle 1 is composed of individual shells.
  • these are an upper half shell 1 a and a lower half shell 1 b.
  • the shells 1a, 1b are profiles which are welded together at weld seams 16 running along the axle body, so as to form as a result a closed, substantially square profile cross-section.
  • the strength of the axle body 1 is the fact that the rounded corner regions 27 arranged between the individual flat profile sections have a wall thickness which is increased in relation to the wall thickness in the other profile sections of the axle body. This local material accumulation leads to increased strength in the corner regions of the axle body. 1
  • FIG. 2 shows in each case different stages of a method arranged here below outer die 20, in which a arranged up here Inner die 21 is retractable under high pressure.
  • External die 20 and inner die 21 together form a cold forming press.
  • the die 20 has an elongated channel 23 of substantially rectangular shape, but rounded corners 29.
  • Also serving as the male inner die 21 has substantially an elongated, rectangular cross-section, wherein the here designed as outer corners corners 28 turn are rounded.
  • the length of the metal strip 22 corresponds to the length of the axle body to be produced.
  • the sheet metal strip 22 is cold worked by right-angled folding.
  • the resulting profile 24 has in the embodiment described here the shape of a half shell with U-shaped cross-section and with a plurality of profile sections, namely a base 25, two perpendicular to the base 25 arranged legs 26 and the rounded corner regions 27 between the legs 26 and Base 25.
  • the design of the corner regions 27 therefore takes place primarily by the shape of the correspondingly rounded outer corners 28 formed on the inner matrix 21.
  • the third illustration in FIG. 2 shows the final stage in the deformation by the cold-forming press 19, ie the inner die 21 is maximally retracted into the outer die 20.
  • the underside of the inner die 21 presses flat against the base 25 of the profile, and at the same time, this base 25 lies flat against the bottom of the outer die 20 under pressing force.
  • cavities 30 remain unfilled by the material of the profile 24. In order to fill these cavities 30 and at the same time to reinforce the profile in its corner regions 27, an additional upsetting step takes place following the cold deformation.
  • This upsetting step with the compression force F takes place at maximum retracted Matrizen 20, 21.
  • Stamp 33 are moved against the free end surfaces 34 of the legs 26. With increasing stamping pressure, it comes to one of the two surfaces 36, 37 of the Matrices parallel and directed towards the corners upsetting force with the result of a plastic deformation of the profile material.
  • a prior targeted heating of the corners forming profile areas which will be discussed later, caused by the compression plastic deformation takes place exclusively in the corner region 27 of the profile 24, with the result that the material completely fills the previously existing there cavities 30 , This leads to the desired material reinforcement in the corner region of the profile.
  • FIG. 2 serve as a stamp 33 elongated, movable against the end faces 34 strips, which are guided in or on the inner die 21.
  • FIG. 3 illustrated method variant serving as a punch 33 strips are pivotally attached to the inner die 21. During the rectangular deformation of the profile 24, these strips are still without function, and pivoted for this purpose to the outside. Subsequently, according to the third illustration in FIG. 3 the inner die 21 is first raised again, and the punch 33 are pivoted inward. Then moves according to the fourth illustration in FIG. 3 the inner die 21 including the stamped inward punch 33 again down, so that now the punch 33 exert the desired compression force on the two legs 26 of the profile 24 and it comes to the plastic deformation in the previously heated corner regions 27.
  • FIG. 4 shows the conditions in the corner region of an inner die 21 (male) and a corresponding outer die 20.
  • Both the outer corner 28 of the inner die 21, and the inner corner 29 of the outer die 20 are designed as a curvature in the form of a quarter-circle segment. So that the wall thickness W1 in the corner regions 27 is increased in relation to the wall thicknesses W2 in the other profile sections 25, 26, the center of curvature 42 of the outer corner 28 is further away from the inner corner 29 than the center of curvature 41 of the inner corner 29 is removed from the inner corner.
  • the radius R2 of the inner corner 29 is slightly larger than the radius R1 of the outer corner.
  • the sheet metal strip 22 is partially heated before the upsetting step.
  • the aim of the heating is First, that even the first Verforrnungs Republic in which arise by rectangular folding the corner areas, with less deformation force is feasible.
  • the main goal is that the material arranged in the corner region of the dies 20, 21 has a higher temperature during the subsequent upsetting step than the material in the remaining profile sections 25, 26
  • FIG. 5 shows this in a shortened view the still undeformed, flat sheet metal strip 22 including two longitudinal regions 44, in which the sheet metal strip is heated locally. During the subsequent deformation, the longitudinal regions 44 form the corner regions 27 of the folded profile. If the leg 26 with the compression force F ( FIG.
  • the two surfaces 36, 37 are not exactly parallel to each other, but have a small angle W to each other.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Claims (3)

  1. Procédé de fabrication d'un corps axial composé de profilés placés les uns contre les autres, ayant une section transversale fermée avec des portions de profilé placées à angle droit les unes par rapport aux autres, dans lequel les zones d'angle (27) entre les portions de profilé sont arrondies, et les épaisseurs de paroi (W1) sont augmentées dans les zones d'angle (27) par rapport aux épaisseurs de paroi (W2) dans les autres portions de profilé, comprenant les étapes consistant à :
    - déformer un ruban de tôle plat (22) en un profilé coudé (24) entre une matrice extérieure (20) présentant un coin intérieur arrondi (29) avec une surface droite (36) adjacente à celui-ci et une matrice intérieure (21) présentant un coin extérieur arrondi (28) avec une surface droite (37) adjacente à celui-ci, les surfaces droites (36, 37) des matrices (20, 21) s'étendant de façon substantiellement parallèle l'une à l'autre,
    - solliciter la portion de profilé (26) disposée entre les surfaces (36, 37) par une force d'écrasement (F) orientée vers les coins, avec une déformation plastique du matériau dans la zone d'angle (27), et
    - assembler les profilés (24) ainsi formés en corps axial (1),
    caractérisé en ce que la courbure du coin extérieur (28) est relative à un autre centre de courbure (42) que la courbure du coin intérieur (29), et le centre de courbure (42) du coin extérieur (28) est situé plus loin du coin intérieur (29) que le centre de courbure (41) du coin intérieur (29).
  2. Procédé selon la revendication 1, caractérisé en ce que le matériau disposé dans la zone d'angle (27) présente au moins pendant l'écrasement une température supérieure au matériau dans les autres portions de profilé (25, 26).
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce que les courbures sont respectivement des segments de cercle et les centres de courbure (41, 42) sont respectivement les centres de rayon des segments de cercle.
EP08006947A 2008-04-08 2008-04-08 Procédé de fabrication d'un corps d'axe constitué de profilés installés les uns contre les autres Not-in-force EP2108469B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP08006947A EP2108469B1 (fr) 2008-04-08 2008-04-08 Procédé de fabrication d'un corps d'axe constitué de profilés installés les uns contre les autres
AT08006947T ATE473816T1 (de) 2008-04-08 2008-04-08 Verfahren zum herstellen eines aus gegeneinander gesetzten profilen bestehenden achskörpers
DE502008000939T DE502008000939D1 (de) 2008-04-08 2008-04-08 Verfahren zum Herstellen eines aus gegeneinander gesetzten Profilen bestehenden Achskörpers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08006947A EP2108469B1 (fr) 2008-04-08 2008-04-08 Procédé de fabrication d'un corps d'axe constitué de profilés installés les uns contre les autres

Publications (2)

Publication Number Publication Date
EP2108469A1 EP2108469A1 (fr) 2009-10-14
EP2108469B1 true EP2108469B1 (fr) 2010-07-14

Family

ID=40129108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08006947A Not-in-force EP2108469B1 (fr) 2008-04-08 2008-04-08 Procédé de fabrication d'un corps d'axe constitué de profilés installés les uns contre les autres

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Country Link
EP (1) EP2108469B1 (fr)
AT (1) ATE473816T1 (fr)
DE (1) DE502008000939D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011079095A1 (de) 2011-07-13 2013-01-17 Hilti Aktiengesellschaft Verfahren zum Herstellen eines Profils aus einem Blechband
US20230311569A1 (en) * 2022-03-31 2023-10-05 Caterpillar Inc. Front axle for mining machines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59109466A (ja) * 1982-12-16 1984-06-25 Nissan Motor Co Ltd 主として曲げ荷重を受ける部位に用いられる自動車用メンバの製造方法
JP2877962B2 (ja) * 1990-12-17 1999-04-05 プレス工業株式会社 アクスルケース側板の製法
DE4300158C2 (de) 1993-01-07 1994-11-17 Bergische Achsen Kotz Soehne Verfahren zum Herstellen von Achskörpern mit annähernd quadratischem Querschnitt
BRPI0700863B1 (pt) * 2007-03-01 2018-05-29 Delga Indústria e Comércio Ltda Processo de fabricação de meia carcaça de veículo automotivo

Also Published As

Publication number Publication date
ATE473816T1 (de) 2010-07-15
EP2108469A1 (fr) 2009-10-14
DE502008000939D1 (de) 2010-08-26

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