EP1755805B1 - Procede de pressage a froid d'une plaque metallique sans plissage, pour fabriquer un logement d'essieu - Google Patents

Procede de pressage a froid d'une plaque metallique sans plissage, pour fabriquer un logement d'essieu Download PDF

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Publication number
EP1755805B1
EP1755805B1 EP05745518A EP05745518A EP1755805B1 EP 1755805 B1 EP1755805 B1 EP 1755805B1 EP 05745518 A EP05745518 A EP 05745518A EP 05745518 A EP05745518 A EP 05745518A EP 1755805 B1 EP1755805 B1 EP 1755805B1
Authority
EP
European Patent Office
Prior art keywords
metal plate
cold pressing
slits
axle housing
compressive stresses
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
EP05745518A
Other languages
German (de)
English (en)
Other versions
EP1755805A1 (fr
Inventor
Michael Tanskanen
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.)
Scania CV AB
Original Assignee
Scania CV AB
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 Scania CV AB filed Critical Scania CV AB
Publication of EP1755805A1 publication Critical patent/EP1755805A1/fr
Application granted granted Critical
Publication of EP1755805B1 publication Critical patent/EP1755805B1/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 present invention relates to a method according to the preamble of claim 1 for manufacture of an axle housing half intended to form part of an axle housing for a rear axle assembly of a vehicle (see for example DE-A-2030086 ).
  • An axle housing for a rear axle assembly of a vehicle normally comprises two axle housing halves welded together.
  • Each axle housing half takes the form of a profile with a U-shaped cross-section. In the middle portion of the profile as seen in a side view of the profile, the profile extends in a substantially semicircular bulge.
  • Axle housing halves may for example be manufactured by hot pressing of a suitably cut-to-size metal plate as described, for example, in US 2 674 783 A , whereby the metal plate is heated to a very high temperature before being formed by pressing between a punch and a die of a forming tool.
  • Figs. 1 and 2 depict a metal plate 1 in its spread state, i.e. before it is cold-pressed to form an axle housing half.
  • This metal plate 1 has been subjected to cutting or stamping to give it a basic shape suitable for it to be formed as an axle housing half.
  • the area 2 of the metal plate 1 which is subject to compressive stresses during cold pressing, i.e. the middle portion of the metal plate, has here been made as narrow as possible in order to reduce wrinkling of the metal plate due to the cold pressing.
  • the object of the present invention is to solve the aforesaid wrinkling problem in the cold pressing of metal plates and thereby, for example, to make it possible to manufacture wrinkle-free axle housing halves without having to machine lateral surfaces of the axle housing halves.
  • said object is achieved by means of a method exhibiting the features indicated in claim 1.
  • slits are provided in the portions of the metal plate where compressive stresses occur as a result of cold pressing and where wrinkling in the metal plate due to compressive stresses is to be prevented, said slits being adapted so that the compressive stresses which occur in these portions of the metal plate as a result of cold pressing of the metal plate cause local thickening of the metal plate in a region around the bottom of the respective slits instead of causing wrinkling of the metal plate.
  • the aforesaid wrinkling of the metal plate due to cold pressing is thereby prevented.
  • the slits concerned are easy to provide in the flat metal plate by stamping or cutting.
  • said slits and the locally thickened regions around the bottom of the slits are removed after the cold pressing by removing, preferably by cutting, areas of metal plate around the respective slits.
  • Fig. 1 depicts in plan view a metal plate 10, e.g. made of steel, which by cutting and/or stamping has been given a shape adapted to the manufacture of an axle housing half.
  • a metal plate 10 e.g. made of steel, which by cutting and/or stamping has been given a shape adapted to the manufacture of an axle housing half.
  • compressive stresses occur in the middle area of the metal plate.
  • These compressive stresses are mainly concentrated in the portions 11 of the metal plate which are denoted by broken lines in Fig. 3 .
  • These portions 11 form part of the areas of the metal plate which as a result of the cold pressing are shaped as longitudinal flanges 21 of the axle housing, and more specifically in the areas of the metal plate which as a result of the cold pressing are shaped as flange portions of the substantially semicircular bulge 43 of the axle housing (see Fig. 7 ).
  • slits 12 are provided in said portions 11 of the metal plate.
  • the respective slits 12 are provided in one edge of the metal plate so that they each present an aperture 13 facing towards the edge.
  • the respective slits 12 are provided in a longitudinal edge 14 of the metal plate so that they extend from the relating edge a short distance into the metal plate 10 towards the centreline of the metal plate.
  • the respective slits 12 are preferably formed with a depth which is greater than their width, i.e. the extent of each slit into the metal plate from the relating edge 14 is preferably greater than its extent along said edge 14.
  • the respective slits 12 are also with advantage each provided with a rounded bottom 15. It has in fact been found that a slit with a rounded bottom has in this context a more advantageous effect than a corresponding slit with a pointed bottom.
  • the metal plate illustrated in Fig. 3 is also provided in a known manner with a guide hole 17, a so-called pilot hole, for cooperation with a corresponding guide pin, a so-called pilot, of the cold pressing tool's punch in order to ensure correct positioning of the metal plate in the cold pressing tool.
  • Fig. 4 depicts part of the metal plate 10 according to Fig. 3 after the metal plate's cold pressing in a cold pressing tool.
  • the cold pressing has resulted in the metal plate 10 having a U-shaped cross-section with a web 20 and two longitudinal flanges 21 which each protrude upwards in the same direction on their respective side of the web 20.
  • the aforesaid slits 12 will be situated in the area of the respective longitudinal flange 21 where the latter's upper edge 21 a has a concave extent. It is precisely in this area of the respective longitudinal flange 21 that the greatest compressive stresses occur as a result of the metal plate 10 being cold-pressed to the shape illustrated in Fig. 4 .
  • the slits 12 are adapted so that the compressive stresses which occur in the aforesaid portions 11 of the metal plate as a result of the cold pressing of the metal plate cause local thickenings 22 of the metal plate in the region around the bottom 15 of the respective slits 12 instead of causing wrinkles in the metal plate.
  • the respective thickenings 22 each exhibit a substantially circular or oval shape on the surface of the metal plate. It has been found that by suitable adaptation of the positioning and configuration of the slits 12 it is possible to achieve local thickenings of relatively limited extent around the bottom of the respective slits.
  • the positioning and configuration of the slits 12 is adapted from case to case according to the shape imparted to the metal plate by the cold pressing and the associated compressive stresses in the metal plate.
  • the respective slits 12 need to be wide enough not to be squeezed fully together by the cold pressing.
  • the shape of each slit 12 also needs to be adapted so that the slit is not squeezed fully together at its bottom 15 during the cold pressing, since it is advantageous that the plate material be allowed to flow into the bottom of the slit instead of merely becoming thickened.
  • the depth of the respective slits 12 needs to be as large as possible relative to their width.
  • the slits 12 have also to be positioned not too close to one another, since a certain amount of plate material between the slits is necessary for counteracting the formation of wrinkles in the regions between them.
  • the slits 12 are with advantage arranged in such a way that there is between two mutually adjacent slits an area of plate 16 with a width which is at least twice the thickness of the metal plate 10.
  • the slit bottoms 15 will act as "hinges” or articulation points where it is permissible for the metal plate to become thickened, instead of becoming wrinkled, by the compressive stresses occurring during the cold pressing.
  • said slits 12 are with advantage removed by removal of the respective area of metal plate around each slit. Said areas of metal plate are advantageously removed by cutting.
  • the regions 22 of the metal plate which exhibit said local thickenings, or at least the major part of each of these regions, are preferably also removed.
  • Figs. 5 and 6 illustrate a process for cold pressing of a metal plate 10 which in accordance with the method according to the invention has been provided with slits 12.
  • the metal plate 10 is here intended for the manufacture of an axle housing and has two protrusions 18 on the respective longitudinal edge 14 for adaptation to the final shape of the axle housing half.
  • the slits 12 are here arranged in the area of said edge 14 which extends in an arcuate shape between the two edge protrusions 18.
  • the metal plate 10 is shaped by means of a cold pressing tool which comprises a punch 30 and a die 31.
  • the metal plate 10 is placed between the punch 30 and the die 31 and brought, on the basis of the aforesaid guide hole 17 and guide pin (not depicted), to a correct position relative to the punch and the die (see Fig. 5 ). Thereafter the punch 30 is pressed towards the die 31, whereby the metal plate 10 is pressed down in the die 31 by the punch 30 until the punch, via the metal plate 10, comes into contact with the die (see Fig. 6 ). The metal plate 10 will thus be pressed to desired shape. This pressing is effected without preheating of the metal plate 10.
  • Fig. 7 illustrates in side view an object 40 formed by the cold pressing illustrated in Figs. 5 and 6 .
  • the cold pressing has resulted in the object 40 having a U-shaped cross-section with a web 20 and two longitudinal flanges 21 which each protrude upwards in the same direction on their respective side of the web 20.
  • the object 40 comprises in its longitudinal direction two substantially straight portions 41, 42 each situated at its respective end of the object, and a middle portion 43 which extends between these substantially straight portions 41, 42 and forms a substantially semicircular bulge of the object.
  • Figs. 7 illustrates in side view an object 40 formed by the cold pressing illustrated in Figs. 5 and 6 .
  • the cold pressing has resulted in the object 40 having a U-shaped cross-section with a web 20 and two longitudinal flanges 21 which each protrude upwards in the same direction on their respective side of the web 20.
  • the object 40 comprises in its longitudinal direction two substantially straight portions 41, 42 each situated at its respective end of the object,
  • the slits 12 will be situated in the area of the respective longitudinal flanges 21 where the flange's upper edge 2 1 a has a concave extent, i.e. in the area of the respective longitudinal flanges 21 which extend along the bulging middle portion 43 of the object 40.
  • the slits 12 are so adapted that the compressive stresses which occur as a result of the cold pressing of the metal plate 10 cause local thickenings 22 of the metal plate in the region around the respective bottoms 15 of the slits 12 instead of causing wrinkles of the metal plate.
  • the object 40 is given its final form by the upper area of the respective longitudinal flanges 21 being removed, preferably by cutting.
  • the cut line 45 is represented by a broken line in Fig. 7 .
  • the slits 12 and the local thickenings 22 in the example illustrated are situated in the upper area 44 of the respective longitudinal flanges 21 which is removed, with the result that after these areas 44 have been removed the object 40 is free both from slits 12 and from thickenings 22.
  • the object 40 has the shape of an axle housing half.
  • Fig. 8 illustrates an axle housing 50 formed by joining together, e.g. by welding, two such axle housing halves 40.
  • the axle housing 50 illustrated is intended for a rear axle assembly of a motor vehicle, e.g. a truck. This axle housing 50 is intended to accommodate inter alia a differential gear and a rear axle.
  • the method according to the invention is particularly advantageous in the cold pressing of metal plates which have a thickness of the order of 6 mm or more.

Claims (10)

  1. Procédé de fabrication d'un demi-carter de pont destiné à faire partie d'un carter de pont pour un ensemble de pont arrière de véhicule, en partant d'une plaque de métal (10), l'objet (40) étant formé par estampage de la plaque de métal (10) à froid, caractérisé en ce que l'estampage à froid de la plaque de métal (10) est précédé de la formation de fentes dans au moins certaines des parties (11) de la plaque de métal dans lesquelles des contraintes de compression se manifestent sous l'effet de l'estampage à froid, lesdites fentes (12) étant appropriées pour que les contraintes de compression qui se manifestent dans ces parties (11) de la plaque de métal sous l'effet de l'estampage à froid de la plaque de métal (10) provoquent un épaississement local (22) de la plaque de métal dans une région entourant le fond (15) des fentes respectives (12) afin de prévenir sensiblement par ce moyen le plissement de ces parties (11) de la plaque de métal qui serait dû à ces contraintes de compression.
  2. Procédé selon la revendication 1, caractérisé en ce que lesdites fentes (12) sont éliminées après l'estampage à froid par enlèvement de zones de la plaque de métal qui entourent les fentes respectives.
  3. Procédé selon la revendication 2, caractérisé en ce que les régions de la plaque de métal qui présentent lesdits épaississements locaux (22) sont sensiblement éliminées après l'estampage à froid.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce que ladite élimination est réalisée par coupe.
  5. Procédé selon une quelconque des revendications 2 à 4, caractérisé en ce qu'au moins certaines desdites fentes (12) sont prévues dans une zone de la plaque de métal qui, sous l'effet de l'estampage à froid, est façonnée pour former une bride (21) de l'objet (40).
  6. Procédé selon une quelconque des revendications précédentes, caractérisé en ce que les fentes respectives (12) sont agencées dans un bord (14) de la plaque de métal de manière à présenter une ouverture (13) dirigée vers le bord.
  7. Procédé selon une quelconque des revendications précédentes, caractérisé en ce que les fentes respectives (12) sont dotées d'une profondeur qui est plus grande que leur largeur.
  8. Procédé selon une quelconque des revendications précédentes, caractérisé en ce que la forme de chacune des fentes respectives (12) est appropriée pour que son fond (15) ne soit pas entièrement refermé pendant l'estampage à froid.
  9. Procédé selon une quelconque des revendications précédentes, caractérisé en ce que les fentes (12) sont agencées de telle manière qu'il y ait entre deux fentes mutuellement adjacentes une zone de la plaque (16) dont la largeur est au moins le double de l'épaisseur de la plaque de métal (10).
  10. Procédé selon une quelconque des revendications précédentes, caractérisé en ce que chacune des fentes respectives (12) est dotée d'un fond arrondi (15).
EP05745518A 2004-06-02 2005-05-27 Procede de pressage a froid d'une plaque metallique sans plissage, pour fabriquer un logement d'essieu Not-in-force EP1755805B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0401406A SE527277C2 (sv) 2004-06-02 2004-06-02 Förfarande för undvikande av rynkbildning vid kallpressning
PCT/SE2005/000790 WO2005118178A1 (fr) 2004-06-02 2005-05-27 Procede de pressage a froid d'une plaque metallique sans plissage, en particulier pour fabriquer un logement d'essieu

Publications (2)

Publication Number Publication Date
EP1755805A1 EP1755805A1 (fr) 2007-02-28
EP1755805B1 true EP1755805B1 (fr) 2011-03-09

Family

ID=32589860

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05745518A Not-in-force EP1755805B1 (fr) 2004-06-02 2005-05-27 Procede de pressage a froid d'une plaque metallique sans plissage, pour fabriquer un logement d'essieu

Country Status (7)

Country Link
EP (1) EP1755805B1 (fr)
AT (1) ATE500909T1 (fr)
BR (1) BRPI0510795A (fr)
DE (1) DE602005026806D1 (fr)
ES (1) ES2361199T3 (fr)
SE (1) SE527277C2 (fr)
WO (1) WO2005118178A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2510445B (en) * 2013-08-16 2017-05-24 Rolls Royce Plc A method of reducing wrinkles in pressed sheet metal components
JP6583221B2 (ja) * 2016-11-16 2019-10-02 Ｊｆｅスチール株式会社 プレス成形方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2370641A (en) 1942-07-16 1945-03-06 Clarence L Dewey Method of forming rear axle housings
US2674783A (en) 1949-09-03 1954-04-13 Rockwell Spring & Axle Co Method of producing axle housings
US3583188A (en) * 1969-02-20 1971-06-08 Masanobu Nakamura Automobile rear axle housing and method of making same
DE2030086A1 (en) * 1970-06-18 1971-12-23 Gorkowskij Awtomobilnij Sawod, Gorki (Sowjetunion) Heavy vehicle rear axle mountings - cold forged and water quenched
GB1288130A (fr) * 1970-07-07 1972-09-06

Also Published As

Publication number Publication date
SE0401406D0 (sv) 2004-06-02
SE0401406L (sv) 2005-12-03
ES2361199T3 (es) 2011-06-14
DE602005026806D1 (de) 2011-04-21
SE527277C2 (sv) 2006-01-31
ATE500909T1 (de) 2011-03-15
BRPI0510795A (pt) 2007-11-20
WO2005118178A1 (fr) 2005-12-15
EP1755805A1 (fr) 2007-02-28

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