WO2005072998A1 - Sheet metal connecting member which is intended to be welded to an element comprising a coupling surface, production method thereof, corresponding drawing die and vehicle - Google Patents

Sheet metal connecting member which is intended to be welded to an element comprising a coupling surface, production method thereof, corresponding drawing die and vehicle Download PDF

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Publication number
WO2005072998A1
WO2005072998A1 PCT/FR2004/003304 FR2004003304W WO2005072998A1 WO 2005072998 A1 WO2005072998 A1 WO 2005072998A1 FR 2004003304 W FR2004003304 W FR 2004003304W WO 2005072998 A1 WO2005072998 A1 WO 2005072998A1
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WO
WIPO (PCT)
Prior art keywords
connecting member
docking
welded
intended
open section
Prior art date
Application number
PCT/FR2004/003304
Other languages
French (fr)
Inventor
Ricardo Ferreira
Jean-Marc Thirel
Original Assignee
Auto Chassis International Snc
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 Auto Chassis International Snc filed Critical Auto Chassis International Snc
Priority to EP04816437A priority Critical patent/EP1713650A1/en
Priority to BRPI0418165-4A priority patent/BRPI0418165A/en
Publication of WO2005072998A1 publication Critical patent/WO2005072998A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G7/00—Pivoted suspension arms; Accessories thereof
    • B60G7/001—Suspension arms, e.g. constructional features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/10—Constructional features of arms
    • B60G2206/122—Constructional features of arms the arm having L-shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B60G2206/81—Shaping
    • B60G2206/8104—Shaping by drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B60G2206/82—Joining
    • B60G2206/8201—Joining by welding

Definitions

  • Sheet metal connecting member intended to be welded with an element having a docking surface, manufacturing process, stamping matrix and corresponding vehicle.
  • the field of the invention is that of motor vehicles. More specifically, the invention relates to sheet metal connecting members having a docking area with a view to being welded to an element whose periphery has a shape complementary to that of the docking area.
  • this type of connection is found in particular in: - the suspension arms, such arms being able to connect the support of a wheel (front or rear) of a vehicle to the vehicle body or to a fixed cradle at the register ; - the connecting element (or cross member) of an axle.
  • the suspension arms concerned are in particular, but not exclusively, boomerang type arms (so called for their similarity in shape with a boomerang).
  • a suspension arm of this type is illustrated in FIG. 1.
  • an arm 1 is generally defined by three characteristic points designated by the letters A, B, E.
  • the rotation of the arm around of the X axis is allowed in particular thanks to a pivoting connection between the arm and the cradle (or between the arm and the body), this connection being provided at point A, by a socket 2.
  • these arms are made of sheet metal and have a single-sheet or double-shell structure. Generally, such sheet metal arms are shaped by a stamping technique.
  • FIG. 2 illustrates such a docking area 11 of a socket on a single-piece arm 1. As it appears, this docking area is formed by two curved edges 111, together defining a cradle of shape adapted to the periphery of the socket.
  • a known technique for obtaining these curved edges 111 consists in making a cut corresponding to these edges in the sheet metal blank flat (before stamping), then in stamping the arm. At the end of the drawing of the arm, the edges 111 occupy the position as illustrated in FIG. 2, and each offer essentially linear support.
  • This technique although widely used, has some drawbacks. First, such a technique clearly involves a cutting step, which involves operating and tooling costs tending to increase the cost price of the suspension arm. In addition, this technique does not make it possible to obtain always satisfactory precision. Indeed, traditional cutting techniques generally generate inaccuracies (except to resort to high precision techniques whose operating costs are then prohibitive).
  • the stamping technique a dispersion of the order of 15/100 6 is conventionally observed over the thickness of the sheet. In other words, variations in the stamped shapes are observed, these variations proving difficult to control.
  • the curved edges of the docking area have a shape which does not correspond perfectly to that of the sleeve to be welded on the arm. It follows that the junction between these curved edges and the sleeve may have defects which are detrimental to the behavior of the weld beads deposited at this junction.
  • Another technique consists in making the cuts corresponding to the curved edges of the docking area after the stamping operation. For this, a special stamping press is used incorporating a mechanism known in itself as a cam cutter actuating trimming tools.
  • this cutting technique also leads to inaccuracies, this time of the order of 1/10 th of a millimeter. For the reasons mentioned above, such imprecision can again adversely affect the holding of the weld beads added between the docking area and the socket.
  • this cam cutting technique only allows tools to be cut using a transverse approach with respect to the drawing direction. Therefore, the edge which overhangs the docking area cannot be cut by this technique. Also, to overcome this problem, provision is made to "yawn" this upper edge, so that it does not interfere with the docking area. In other words, provision is made to separate this edge from the docking area so that a day appears between this edge and the bush when the latter is placed in the docking area.
  • the invention aims to propose a technique for producing a docking area on a connecting member which makes it possible to improve the resistance of the weld beads connecting this member to an element placed in the docking area in question.
  • the invention also aims to provide such a connecting member which can be obtained more simply and less costly than similar members of the prior art.
  • the invention also aims to provide such a connecting member which is simple in design and easy to implement.
  • said docking zone comprises at least one docking surface extending essentially transversely to said section open and having a shape intended to match said portion of said element.
  • said surface extends from the open section so as to close said end of said member.
  • the docking surface is formed integrally with the walls of the open section of the connecting member, which ensures good rigidity to the assembly.
  • said surface extends so as to conform to approximately a quarter of the periphery of said portion.
  • the connecting member is welded to said portion of said element by means of at least three weld beads, at least two beads of which are along the periphery of said portion and at least one upper bead substantially parallel to the longitudinal axis of said portion.
  • the connecting member is produced by stamping, including said docking surface.
  • a connecting member according to the invention can therefore be obtained in a particularly simple and inexpensive manner.
  • the connecting member consists of a suspension arm for a wheel of a motor vehicle and in that said element is a socket.
  • the connecting member preferably consists of a suspension arm of the single-plate or double-shell boomerang type.
  • the connecting member consists of a cross member of an axle connecting two longitudinal arms and in that said element is one of said longitudinal arms.
  • the invention also relates to an assembly formed by a sheet metal connecting member for a motor vehicle, having a section open at least in the vicinity of one of its ends, welded with at least one element having at least one portion whose periphery is complementary to a docking zone provided at said end of said connecting member, said docking zone comprising at least one docking surface extending essentially transverse to said open section and having a shape intended to match said portion said element.
  • said element is welded to said docking surface by at least three weld beads, including at least two beads along the periphery of said portion and at least one upper bead substantially parallel to the longitudinal axis of said portion.
  • said weld between said element and said docking surface comprises at least a fourth weld bead substantially parallel to said upper bead. Such a fourth weld bead naturally contributes to improving the strength of the connection between the connection member and the welded element.
  • the invention also relates to a method of manufacturing a sheet metal connecting member having at least in the vicinity of at least one of its ends an open section, intended to be welded with at least one element having at least a portion of which the periphery is complementary to a docking area of said connecting member, characterized in that it comprises a step of forming at least one docking surface extending essentially transversely relative to said open section and having a shape intended to marry said portion of said element.
  • said training step is carried out by stamping.
  • the invention also relates to a stamping die intended to stamp a sheet metal connecting member having at least in the vicinity of at least one of its ends an open section, intended to be welded with at least one element having at least one portion whose periphery is complementary to a docking area of said connecting member, characterized in that it comprises means for forming at least one docking surface extending essentially transversely relative to said open section and having a shape intended to match said portion of said element.
  • the invention also relates to a vehicle equipped with at least one sheet metal connecting member as described above.
  • FIG. 1 is a view of a single-plate suspension arm according to the prior art
  • - Figure 2 is a detail view of a docking area of the suspension arm illustrated in Figure 1
  • - Figure 3 is a detail view of a docking area according to the invention
  • - Figures 4 and 5 are each a view of a socket welded to a docking area according to the invention, from different angles of view.
  • the principle of the invention consists in providing a surface connection zone on a sheet metal connecting member intended to be joined by welding to an element such as a bush or a longitudinal axle arm. the shape partially matches the element to be welded.
  • FIG. 3 which shows one end (corresponding to point A of a boomerang arm as indicated above) of a single-beam suspension arm 3, of boomerang type, such an arm having a plane 31 extending laterally by fallen edges.
  • a single-beam suspension arm 3 of boomerang type, such an arm having a plane 31 extending laterally by fallen edges.
  • Such an arm forms a hollow body with an open section and is produced by stamping.
  • this arm 3 has a surface docking area 33 intended to receive a socket 2, the surface of the docking area 33 being formed so as to match the cylindrical shape of the socket.
  • the surface 33 of the docking zone extends substantially transversely to the fallen edges 32, forming an end closure of the monotole arm. As it appears, the surface 33 of the docking zone extends angularly over approximately 90 ° and therefore offers a contact surface for approximately a quarter of the periphery of the socket 2.
  • Figures 4 and 5 illustrate a suspension arm such as that which has just been described, on the docking zone from which a socket 2 has been welded.
  • connection is ensured by four weld beads: - two peripheral beads 21; - An upper cord 22, extending along a generatrix of the socket 2; - A lower cord 23, extending along another generatrix of the sleeve 2, in the vicinity of the lower edge of the docking area 33.
  • a suspension arm is obtained by stamping, using of a matrix including means for forming the docking surface 33.
  • the invention can similarly apply to a cross member of a flexible axle having an open section (for example in "U” or in “V”), and having to connect two longitudinal arms. More generally, the invention applies to any sheet metal connecting member having a section open at one of its ends and intended to be welded with an element whose periphery is complementary to a docking area provided for said end of this connecting member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Connection Of Plates (AREA)

Abstract

The invention relates to a sheet metal connecting member comprising an open section which is at least close to at least one of the ends thereof. The inventive member is intended to be welded to at least one element (2) comprising at least one portion having a peripheral shape that is complementary to a coupling zone provided at the aforementioned end of the connecting member. The invention is characterised in that the coupling zone comprises at least one coupling surface (33) which extends essentially transversely in relation to the open section and which has a shape that is designed to match the above-mentioned portion of the element (2).

Description

Organe de liaison en tôle destiné à être soudé avec un élément présentant une surface d'accostage, procédé de fabrication, matrice d'emboutissage et véhicule correspondants. Le domaine de l'invention est celui des véhicules automobiles. Plus précisément, l'invention concerne les organes de liaison en tôle présentant une zone d'accostage en vue d'être soudés à un élément dont la périphérie présente une forme complémentaire de celle de la zone d'accostage. Dans les véhicules automobiles, on trouve ce type de liaison notamment dans : - les bras de suspension, de tels bras pouvant relier le support d'une roue (avant ou arrière) d'un véhicule à la caisse du véhicule ou à un berceau fixé à la caisse ; - l'élément de liaison (ou traverse) d'un essieu. Les bras de suspension concernés sont en particulier, mais non exclusivement les bras de type boomerang (appelés ainsi pour leur similitude de forme avec un boomerang). Un bras de suspension de ce type est illustré par la figure 1. Tel que cela apparaît, un tel bras 1 est généralement défini par trois points caractéristiques désignés par les lettres A, B, E. Tel qu'illustré, la rotation du bras autour de l'axe X est permise notamment grâce à une liaison à pivotement entre le bras et le berceau (ou entre le bras et la caisse), cette liaison étant assurée au point A, par une douille 2. Le plus souvent, ces bras sont réalisés en tôle et présentent une structure monotôle ou bicoquille. Généralement, de tels bras en tôle sont mis en forme par une technique d'emboutissage. Lorsque l'architecture du véhicule le permet, les bras de suspension sont pourvus, au point A, de collets de réception d'une douille. Toutefois, cet agencement nécessite un espace qui n'est pas toujours compatible avec les contraintes imposées par les constructeurs de véhicules automobiles, qui tendent dans certains cas à limiter l'espace disponible au point A. Un autre type de liaison, sous forme de zone d'accostage, plus adapté à un espace restreint au point A, est alors mis en œuvre. La figure 2 illustre une telle zone d'accostage 11 d'une douille sur un bras monotôle 1. Tel que cela apparaît, cette zone d'accostage est formée par deux bords incurvés 111, définissant ensemble un berceau de forme adaptée à la périphérie de la douille. Une technique connue pour obtenir ces bords incurvés 111 consiste à réaliser une découpe correspondante à ces bords dans le flan de tôle à plat (avant emboutissage), puis à emboutir le bras. A l'issue de l'emboutissage du bras, les bords 111 occupent la position telle qu'illustrée par la figure 2, et offrent chacun un appui essentiellement linéaire. Cette technique, quoique largement utilisée, présente quelques inconvénients. En premier lieu, une telle technique implique clairement une étape de découpe, qui implique des coûts d'exploitation et d'outillage tendant à augmenter le prix de revient du bras de suspension. De plus, cette technique ne permet pas d'obtenir une précision toujours satisfaisante. En effet, les techniques de découpe traditionnelles engendrent généralement des imprécisions (sauf à recourir à des techniques de haute précision dont les coûts d'exploitation sont alors rédhibitoires). En outre, avec la technique d'emboutissage, on observe classiquement une dispersion de l'ordre de 15/1006 sur l'épaisseur de la tôle. En d'autres termes, on observe des variations des formes embouties, ces variations s 'avérant difficilement maîtrisables. Il en résulte que les bords cintrés de la zone d'accostage présentent une forme qui ne correspond pas parfaitement à celle de la douille devant être soudée sur le bras. Il en résulte que la jonction entre ces bords cintrés et la douille peut présenter des défauts qui sont préjudiciables à la tenue des cordons de soudure déposés à cette jonction. Une autre technique consiste à réaliser les découpes correspondant aux bords incurvés de la zone d'accostage après l'opération d'emboutissage. Pour cela, on utilise une presse d'emboutissage particulière intégrant un mécanisme connu en soit de découpe à cames actionnant des outils de détourage. Toutefois, cette technique de découpe entraîne également des imprécisions, cette fois de l'ordre du 1/10e de millimètre. Pour les raisons évoquées précédemment, une telle imprécision peut là encore nuire à la tenue des cordons de soudure rapportés entre la zone d'accostage et la douille. En outre, cette technique de découpe à cames permet uniquement de découper selon une approche transversale des outils par rapport à la direction d'emboutissage. De ce fait, le bord qui surplombe la zone d'accostage ne peut être découpé par cette technique. Aussi, pour pallier ce problème, on prévoit de faire « bailler » ce bord supérieur, de façon qu'il n'interfère pas avec la zone d'accostage. En d'autres termes, on prévoit d'écarter ce bord de la zone d'accostage de telle sorte qu'un jour apparaisse entre ce bord et la douille lorsque celle-ci est placée dans la zone d'accostage. Bien entendu, ceci ôte la possibilité de déposer un cordon de soudure entre ce bord et la douille, sauf à combler un tel jour, ce qui impliquerait une opération fastidieuse et coûteuse. Le problème de la liaison entre une zone d'accostage et un élément à souder dans cette zone d'accostage tel que cela vient d'être décrit, peut être transposé à d'autres organes de liaison. C'est le cas par exemple de certaines traverses d'essieu, formant éléments de liaison entre deux bras longitudinaux. En effet, les traverses à section ouverte, telles que celles utilisées dans les essieux souples, présentent à leurs extrémités des zones d'accostage comparables à celles des bras de suspension décrites précédemment. Or, ces traverses sont traditionnellement réalisées à partir d'une tôle mise en forme par une technique de pliage, essentiellement en raison du faible coût de cette technique. Toutefois, il peut être intéressant d'utiliser la technique de l'emboutissage pour la fabrication des traverses, en particulier si certaines formes particulières ne peuvent être obtenues par la technique du pliage. La réalisation des zones d'accostage de la traverse est alors l'objet de problèmes similaires à ceux évoqués précédemment concernant les bras de suspension. Ces problèmes sont même accentués par le fait que les contraintes s'exerçant sur une traverse sont telles que les liaisons soudées entre cette traverse et les bras longitudinaux de l'essieu doivent présenter une résistance qui ne peut souffrir des effets indésirables dus aux imprécisions mentionnées précédemment. L'invention a notamment pour objectif de pallier les inconvénients de l'art antérieur. Plus précisément, l'invention a pour objectif de proposer une technique pour réaliser une zone d'accostage sur un organe de liaison qui permette d'améliorer la tenue de cordons de soudure liant cet organe à un élément placé dans la zone d'accostage en question. L'invention a également pour objectif de fournir un tel organe de liaison qui puisse être obtenu plus simplement et de façon moins coûteuse que les organes similaires de l'art antérieur. L'invention a aussi pour objectif de fournir un tel organe de liaison qui soit simple de conception et facile à mettre en œuvre. Ces objectifs, ainsi que d'autres qui apparaîtront par la suite, sont atteints grâce à l'invention qui a pour objet un organe de liaison en tôle pour véhicule automobile, présentant une section ouverte au moins au voisinage de l'une de ses extrémités, destiné à être soudé avec au moins un élément présentant au moins une portion dont la périphérie est complémentaire d'une zone d'accostage prévue à ladite extrémité dudit organe de liaison, caractérisé en ce que ladite zone d'accostage comprend au moins une surface d'accostage s'étendant essentiellement transversalement par rapport à ladite section ouverte et présentant une forme destinée à épouser ladite portion dudit élément. On obtient donc une zone d'accostage formant une surface réceptrice offrant une meilleure qualité de contact avec l'élément à souder comparé aux deux bords cintrés distants (offrant chacun des contacts essentiellement linéaires) selon l'art antérieur. En outre, comme cela va apparaître plus clairement par la suite, une telle surface d'accostage permet de déposer davantage de soudures sur l'élément à souder, les contacts de celui-ci avec la zone d'accostage étant plus étendus qu'avec les solutions traditionnelles. Avantageusement, ladite surface s'étend à partir de la section ouverte de façon à fermer ladite extrémité dudit organe. De cette façon, la surface d'accostage est formée d'un seul tenant avec les parois de la section ouverte de l'organe de liaison, ce qui assure une bonne rigidité à l'ensemble. Préférentiellement, ladite surface s'étend de façon à épouser environ un quart de la périphérie de ladite portion. Ainsi, la surface d'accostage est suffisamment étendue pour assurer une liaison satisfaisante avec l'élément à souder, ceci tout en présentant une étendue limitée qui n'entraîne pas d'augmentation importante de quantité de matière (et donc de poids de l'organe) et qui peut être obtenue simplement tel que cela va être explicité par la suite. Selon une solution avantageuse, l'organe de liaison est soudé avec ladite portion dudit élément par l'intermédiaire d'au moins trois cordons de soudure, dont au moins deux cordons selon la périphérie de ladite portion et au moins un cordon supérieur sensiblement parallèle à l'axe longitudinal de ladite portion. Selon une solution avantageuse, l'organe de liaison est réalisé par emboutissage, y inclut ladite surface d'accostage. Un organe de liaison selon l'invention peut donc être obtenu de façon particulièrement simple et de façon peu coûteuse. Selon une première application avantageuse, l'organe de liaison est constitué d'un bras de suspension pour une roue d'un véhicule automobile et en ce que ledit élément est une douille. Dans ce cas, l'organe de liaison est préférentiellement constitué d'un bras de suspension de type boomerang monotôle ou bi-coquille. Selon une deuxième application avantageuse, l'organe de liaison est constitué par une traverse d'un essieu reliant deux bras longitudinaux et en ce que ledit élément est un desdits bras longitudinaux. L'invention concerne aussi un ensemble formé par un organe de liaison en tôle pour véhicule automobile, présentant une section ouverte au moins au voisinage de l'une de ses extrémités, soudé avec au moins un élément présentant au moins une portion dont la périphérie est complémentaire d'une zone d'accostage prévue à ladite extrémité dudit organe de liaison, ladite zone d'accostage comprenant au moins une surface d'accostage s'étendant essentiellement transversalement par rapport à ladite section ouverte et présentant une forme destinée à épouser ladite portion dudit élément. Avantageusement, ledit élément est soudé sur ladite surface d'accostage par au moins trois cordons de soudure, dont au moins deux cordons selon la périphérie de ladite portion et au moins un cordon supérieur sensiblement parallèle à l'axe longitudinal de ladite portion. On note que la liaison soudée d'un tel ensemble présente une tenue améliorée, ceci notamment grâce au troisième cordon supérieur qui peut être déposé simplement et directement du fait du contact qu'offre la surface d'accostage avec l'élément à souder. Préférentiellement, ladite soudure entre ledit élément et ladite surface d'accostage comprend au moins un quatrième cordon de soudure sensiblement parallèle audit cordon supérieur. Un tel quatrième cordon de soudure contribue bien entendu à améliorer la tenue de la liaison entre l'organe de liaison et l'élément soudé. Ceci est permis grâce à la surface d'accostage selon l'invention, qui offre un contact entre l'organe de liaison et l'élément étendu par rapport à l'art antérieur, notamment dans une zone correspondant à une absence de contact avec les zones d'accostage classiques. L'invention concerne également un procédé de fabrication d'un organe de liaison en tôle présentant au moins au voisinage de l'une au moins de ses extrémités une section ouverte, destiné à être soudé avec au moins un élément présentant au moins une portion dont la périphérie est complémentaire d'une zone d'accostage dudit organe de liaison, caractérisé en ce qu'il comprend une étape de formation d'au moins une surface d'accostage s'étendant essentiellement transversalement par rapport à ladite section ouverte et présentant une forme destinée à épouser ladite portion dudit élément. Préférentiellement, ladite étape de formation est réalisée par emboutissage. L'invention concerne aussi une matrice d'emboutissage destinée à emboutir un organe de liaison en tôle présentant au moins au voisinage de l'une au moins de ses extrémités une section ouverte, destiné à être soudé avec au moins un élément présentant au moins une portion dont la périphérie est complémentaire d'une zone d'accostage dudit organe de liaison, caractérisée en ce qu'elle comprend des moyens de formation d'au moins une surface d'accostage s'étendant essentiellement transversalement par rapport à ladite section ouverte et présentant une forme destinée à épouser ladite portion dudit élément. L'invention concerne encore un véhicule équipé d'au moins un organe de liaison en tôle tel que décrit précédemment. D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante d'un mode de réalisation préférentiel de l'invention donné à titre d'exemple illustratif et non limitatif, et des dessins annexés parmi lesquels : - la figure 1 est une vue d'un bras de suspension monotôle selon l'art antérieur ; - la figure 2 est une vue de détail d'une zone d'accostage du bras de suspension illustré par la figure 1 ; - la figure 3 est une vue de détail d'une zone d'accostage selon l'invention ; - les figures 4 et 5 sont chacune une vue d'une douille soudée sur une zone d'accostage selon l'invention, selon différents angles de vue. Tel que mentionné précédemment, le principe de l'invention consiste à réaliser sur un organe de liaison en tôle destiné à être solidarisé par soudage à un élément tel qu'une douille ou un bras longitudinal d'essieu, une zone d'accostage surfacique dont la forme épouse partiellement l'élément à souder. Ceci est illustré par la figure 3 qui montre une extrémité (correspondant au point A d'un bras boomerang tel qu'indiqué précédemment) d'un bras de suspension 3 monotôle, de type boomerang, un tel bras présentant un plan 31 se prolongeant latéralement par des bords tombés. Un tel bras forme un corps creux à section ouverte et est réalisé par emboutissage. Selon l'invention, ce bras 3 présente une zone d'accostage surfacique 33 destinée à recevoir une douille 2, la surface de la zone d'accostage 33 étant formée de façon à épouser la forme cylindrique de la douille. Selon le présent mode de réalisation, la surface 33 de la zone d'accostage s'étend sensiblement transversalement aux bords tombés 32, formant une fermeture d'extrémité du bras monotôle. Tel que cela apparaît, la surface 33 de la zone d'accostage s'étend angulairement sur environ 90° et offre donc une surface de contact pour environ un quart de la périphérie de la douille 2. Les figures 4 et 5 illustrent un bras de suspension tel que celui qui vient d'être décrit, sur la zone d'accostage duquel une douille 2 a été soudée. Tel que cela apparaît, la liaison est assurée par quatre cordons de soudure : - deux cordons périphériques 21 ; - un cordon supérieur 22, s'étendant selon une génératrice de la douille 2 ; - un cordon inférieur 23, s'étendant selon une autre génératrice de la douille 2, au voisinage de la bordure inférieure de la zone d'accostage 33. Comme indiqué précédemment, un tel bras de suspension est obtenu par emboutissage, à l'aide d'une matrice incluant des moyens de formation de la surface d'accostage 33. On note que l'invention peut de façon similaire s'appliquer à une traverse d'un essieu souple présentant une section ouverte (par exemple en « U » ou en « V »), et devant relier deux bras longitudinaux. Plus généralement, l'invention s'applique à tout organe de liaison en tôle présentant une section ouverte à l'une de ses extrémités et destiné à être soudé avec un élément dont la périphérie est complémentaire d'une zone d'accostage prévue à ladite extrémité de cet organe de liaison. Sheet metal connecting member intended to be welded with an element having a docking surface, manufacturing process, stamping matrix and corresponding vehicle. The field of the invention is that of motor vehicles. More specifically, the invention relates to sheet metal connecting members having a docking area with a view to being welded to an element whose periphery has a shape complementary to that of the docking area. In motor vehicles, this type of connection is found in particular in: - the suspension arms, such arms being able to connect the support of a wheel (front or rear) of a vehicle to the vehicle body or to a fixed cradle at the register ; - the connecting element (or cross member) of an axle. The suspension arms concerned are in particular, but not exclusively, boomerang type arms (so called for their similarity in shape with a boomerang). A suspension arm of this type is illustrated in FIG. 1. As it appears, such an arm 1 is generally defined by three characteristic points designated by the letters A, B, E. As illustrated, the rotation of the arm around of the X axis is allowed in particular thanks to a pivoting connection between the arm and the cradle (or between the arm and the body), this connection being provided at point A, by a socket 2. Most often, these arms are made of sheet metal and have a single-sheet or double-shell structure. Generally, such sheet metal arms are shaped by a stamping technique. When the architecture of the vehicle allows, the suspension arms are provided, at point A, with collars for receiving a socket. However, this arrangement requires a space which is not always compatible with the constraints imposed by vehicle manufacturers. automobiles, which in certain cases tend to limit the space available at point A. Another type of connection, in the form of a docking area, more suitable for a space limited to point A, is then implemented. FIG. 2 illustrates such a docking area 11 of a socket on a single-piece arm 1. As it appears, this docking area is formed by two curved edges 111, together defining a cradle of shape adapted to the periphery of the socket. A known technique for obtaining these curved edges 111 consists in making a cut corresponding to these edges in the sheet metal blank flat (before stamping), then in stamping the arm. At the end of the drawing of the arm, the edges 111 occupy the position as illustrated in FIG. 2, and each offer essentially linear support. This technique, although widely used, has some drawbacks. First, such a technique clearly involves a cutting step, which involves operating and tooling costs tending to increase the cost price of the suspension arm. In addition, this technique does not make it possible to obtain always satisfactory precision. Indeed, traditional cutting techniques generally generate inaccuracies (except to resort to high precision techniques whose operating costs are then prohibitive). In addition, with the stamping technique, a dispersion of the order of 15/100 6 is conventionally observed over the thickness of the sheet. In other words, variations in the stamped shapes are observed, these variations proving difficult to control. As a result, the curved edges of the docking area have a shape which does not correspond perfectly to that of the sleeve to be welded on the arm. It follows that the junction between these curved edges and the sleeve may have defects which are detrimental to the behavior of the weld beads deposited at this junction. Another technique consists in making the cuts corresponding to the curved edges of the docking area after the stamping operation. For this, a special stamping press is used incorporating a mechanism known in itself as a cam cutter actuating trimming tools. However, this cutting technique also leads to inaccuracies, this time of the order of 1/10 th of a millimeter. For the reasons mentioned above, such imprecision can again adversely affect the holding of the weld beads added between the docking area and the socket. In addition, this cam cutting technique only allows tools to be cut using a transverse approach with respect to the drawing direction. Therefore, the edge which overhangs the docking area cannot be cut by this technique. Also, to overcome this problem, provision is made to "yawn" this upper edge, so that it does not interfere with the docking area. In other words, provision is made to separate this edge from the docking area so that a day appears between this edge and the bush when the latter is placed in the docking area. Of course, this removes the possibility of depositing a weld bead between this edge and the sleeve, except to fill such a day, which would imply a tedious and expensive operation. The problem of the connection between a docking area and an element to be welded in this docking area as has just been described, can be transposed to other connecting members. This is the case for example of certain axle crosspieces, forming connecting elements between two longitudinal arms. Indeed, cross-members with an open section, such as those used in flexible axles, have at their ends docking areas comparable to those of the suspension arms described above. However, these sleepers are traditionally made from a sheet formed by a folding technique, mainly because of the low cost of this technique. However, it may be advantageous to use the stamping technique for the manufacture of sleepers, in particular if certain particular shapes cannot be obtained by the folding technique. The creation of the cross-docking zones is then the subject of problems similar to those mentioned above concerning the suspension arms. These problems are even accentuated by the fact that the stresses exerted on a cross-member are such that the welded connections between this cross-member and the longitudinal arms of the axle must have a resistance which cannot suffer from the undesirable effects due to the inaccuracies mentioned above. . The invention particularly aims to overcome the drawbacks of the prior art. More specifically, the invention aims to propose a technique for producing a docking area on a connecting member which makes it possible to improve the resistance of the weld beads connecting this member to an element placed in the docking area in question. The invention also aims to provide such a connecting member which can be obtained more simply and less costly than similar members of the prior art. The invention also aims to provide such a connecting member which is simple in design and easy to implement. These objectives, as well as others which will appear subsequently, are achieved thanks to the invention which relates to a sheet metal connecting member for a motor vehicle, having a cross section open at least in the vicinity of one of its ends. , intended to be welded with at least one element having at least a portion whose periphery is complementary to a docking zone provided at said end of said connecting member, characterized in that said docking zone comprises at least one docking surface extending essentially transversely to said section open and having a shape intended to match said portion of said element. We therefore obtain a docking area forming a receiving surface offering a better quality of contact with the element to be welded compared to the two distant curved edges (each offering essentially linear contacts) according to the prior art. In addition, as will appear more clearly below, such a docking surface makes it possible to deposit more welds on the element to be welded, the contacts of the latter with the docking zone being more extensive than with traditional solutions. Advantageously, said surface extends from the open section so as to close said end of said member. In this way, the docking surface is formed integrally with the walls of the open section of the connecting member, which ensures good rigidity to the assembly. Preferably, said surface extends so as to conform to approximately a quarter of the periphery of said portion. Thus, the docking surface is sufficiently large to ensure a satisfactory connection with the element to be welded, this while having a limited extent which does not cause a significant increase in the quantity of material (and therefore in weight of the organ) and which can be obtained simply as will be explained later. According to an advantageous solution, the connecting member is welded to said portion of said element by means of at least three weld beads, at least two beads of which are along the periphery of said portion and at least one upper bead substantially parallel to the longitudinal axis of said portion. According to an advantageous solution, the connecting member is produced by stamping, including said docking surface. A connecting member according to the invention can therefore be obtained in a particularly simple and inexpensive manner. According to a first advantageous application, the connecting member consists of a suspension arm for a wheel of a motor vehicle and in that said element is a socket. In this case, the connecting member preferably consists of a suspension arm of the single-plate or double-shell boomerang type. According to a second advantageous application, the connecting member consists of a cross member of an axle connecting two longitudinal arms and in that said element is one of said longitudinal arms. The invention also relates to an assembly formed by a sheet metal connecting member for a motor vehicle, having a section open at least in the vicinity of one of its ends, welded with at least one element having at least one portion whose periphery is complementary to a docking zone provided at said end of said connecting member, said docking zone comprising at least one docking surface extending essentially transverse to said open section and having a shape intended to match said portion said element. Advantageously, said element is welded to said docking surface by at least three weld beads, including at least two beads along the periphery of said portion and at least one upper bead substantially parallel to the longitudinal axis of said portion. It is noted that the welded connection of such an assembly has an improved resistance, this in particular thanks to the third upper bead which can be deposited simply and directly due to the contact offered by the docking surface with the element to be welded. Preferably, said weld between said element and said docking surface comprises at least a fourth weld bead substantially parallel to said upper bead. Such a fourth weld bead naturally contributes to improving the strength of the connection between the connection member and the welded element. This is allowed thanks to the docking surface according to the invention, which provides contact between the connecting member and the extended element compared to the prior art, in particular in an area corresponding to an absence of contact with the classic docking areas. The invention also relates to a method of manufacturing a sheet metal connecting member having at least in the vicinity of at least one of its ends an open section, intended to be welded with at least one element having at least a portion of which the periphery is complementary to a docking area of said connecting member, characterized in that it comprises a step of forming at least one docking surface extending essentially transversely relative to said open section and having a shape intended to marry said portion of said element. Preferably, said training step is carried out by stamping. The invention also relates to a stamping die intended to stamp a sheet metal connecting member having at least in the vicinity of at least one of its ends an open section, intended to be welded with at least one element having at least one portion whose periphery is complementary to a docking area of said connecting member, characterized in that it comprises means for forming at least one docking surface extending essentially transversely relative to said open section and having a shape intended to match said portion of said element. The invention also relates to a vehicle equipped with at least one sheet metal connecting member as described above. Other characteristics and advantages of the invention will appear more clearly on reading the following description of an embodiment preferential of the invention given by way of illustrative and nonlimiting example, and of the appended drawings among which: - Figure 1 is a view of a single-plate suspension arm according to the prior art; - Figure 2 is a detail view of a docking area of the suspension arm illustrated in Figure 1; - Figure 3 is a detail view of a docking area according to the invention; - Figures 4 and 5 are each a view of a socket welded to a docking area according to the invention, from different angles of view. As mentioned above, the principle of the invention consists in providing a surface connection zone on a sheet metal connecting member intended to be joined by welding to an element such as a bush or a longitudinal axle arm. the shape partially matches the element to be welded. This is illustrated by FIG. 3 which shows one end (corresponding to point A of a boomerang arm as indicated above) of a single-beam suspension arm 3, of boomerang type, such an arm having a plane 31 extending laterally by fallen edges. Such an arm forms a hollow body with an open section and is produced by stamping. According to the invention, this arm 3 has a surface docking area 33 intended to receive a socket 2, the surface of the docking area 33 being formed so as to match the cylindrical shape of the socket. According to the present embodiment, the surface 33 of the docking zone extends substantially transversely to the fallen edges 32, forming an end closure of the monotole arm. As it appears, the surface 33 of the docking zone extends angularly over approximately 90 ° and therefore offers a contact surface for approximately a quarter of the periphery of the socket 2. Figures 4 and 5 illustrate a suspension arm such as that which has just been described, on the docking zone from which a socket 2 has been welded. As it appears, the connection is ensured by four weld beads: - two peripheral beads 21; - An upper cord 22, extending along a generatrix of the socket 2; - A lower cord 23, extending along another generatrix of the sleeve 2, in the vicinity of the lower edge of the docking area 33. As indicated above, such a suspension arm is obtained by stamping, using of a matrix including means for forming the docking surface 33. It is noted that the invention can similarly apply to a cross member of a flexible axle having an open section (for example in "U" or in “V”), and having to connect two longitudinal arms. More generally, the invention applies to any sheet metal connecting member having a section open at one of its ends and intended to be welded with an element whose periphery is complementary to a docking area provided for said end of this connecting member.

Claims

REVENDICATIONS
1. Organe de liaison en tôle pour véhicule automobile, présentant une section ouverte au moins au voisinage de l'une de ses extrémités, destiné à être soudé avec au moins un élément (2) présentant au moins une portion dont la périphérie est complémentaire d'une zone d'accostage prévue à ladite extrémité dudit organe de liaison, caractérisé en ce que ladite zone d'accostage comprend au moins une surface d'accostage (33) s'étendant essentiellement transversalement par rapport à ladite section ouverte et présentant une forme destinée à épouser ladite portion dudit élément (2).1. Sheet metal connecting member for a motor vehicle, having a cross section open at least in the vicinity of one of its ends, intended to be welded with at least one element (2) having at least one portion whose periphery is complementary to 'a docking zone provided at said end of said connecting member, characterized in that said docking zone comprises at least one docking surface (33) extending essentially transversely relative to said open section and having a shape intended to marry said portion of said element (2).
2. Organe de liaison selon la revendication 1, caractérisé en ce que ladite surface (33) s'étend à partir de la section ouverte de façon à fermer ladite extrémité dudit organe.2. Connecting member according to claim 1, characterized in that said surface (33) extends from the open section so as to close said end of said member.
3. Organe de liaison selon l'une des revendications 1 et 2, caractérisé en ce que ladite surface s'étend de façon à épouser environ un quart de la périphérie de ladite portion.3. Connecting member according to one of claims 1 and 2, characterized in that said surface extends so as to marry about a quarter of the periphery of said portion.
4. Organe de liaison selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il est réalisé par emboutissage, y inclut ladite surface d'accostage (33).4. Connecting member according to any one of claims 1 to 3, characterized in that it is produced by stamping, including said docking surface (33).
5. Organe de liaison selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il est constitué d'un bras de suspension (3) pour une roue d'un véhicule automobile et en ce que ledit élément est une douille (2).5. Connecting member according to any one of claims 1 to 4, characterized in that it consists of a suspension arm (3) for a wheel of a motor vehicle and in that said element is a socket (2).
6. Organe de liaison selon la revendication 5, caractérisé en ce qu'il est constitué d'un bras de suspension de type boomerang monotôle ou bi-coquille.6. Connecting member according to claim 5, characterized in that it consists of a suspension arm of boomerang type monotole or bi-shell.
7. Organe de liaison selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il est constitué par une traverse d'un essieu reliant deux bras longitudinaux et en ce que ledit élément est un desdits bras longitudinaux.7. Connecting member according to any one of claims 1 to 4, characterized in that it is constituted by a cross member of an axle connecting two longitudinal arms and in that said element is one of said longitudinal arms.
8. Ensemble formé par un organe de liaison en tôle pour véhicule automobile, présentant une section ouverte au moins au voisinage de l'une de ses extrémités, soudé avec au moins un élément (2) présentant au moins une portion dont la périphérie est complémentaire d'une zone d'accostage prévue à ladite extrémité dudit organe de liaison, caractérisé en ce que ladite zone d'accostage comprend au moins une surface d'accostage (33) s'étendant essentiellement transversalement par rapport à ladite section ouverte et présentant une forme destinée à épouser ladite portion dudit élément (2).8. Assembly formed by a sheet metal connecting member for a vehicle automobile, having a section open at least in the vicinity of one of its ends, welded with at least one element (2) having at least one portion whose periphery is complementary to a docking zone provided at said end of said member of connection, characterized in that said docking zone comprises at least one docking surface (33) extending essentially transversely relative to said open section and having a shape intended to match said portion of said element (2).
9. Ensemble selon la revendication 8, caractérisé en ce que ledit élément (2) est soudé sur ladite surface d'accostage (33) par au moins trois cordons de soudure (21), (22), dont au moins deux cordons (21) selon la périphérie de ladite portion et au moins un cordon (22) supérieur sensiblement parallèle à l'axe longitudinal de ladite portion.9. The assembly of claim 8, characterized in that said element (2) is welded to said docking surface (33) by at least three weld beads (21), (22), including at least two beads (21 ) along the periphery of said portion and at least one upper cord (22) substantially parallel to the longitudinal axis of said portion.
10. Ensemble selon la revendication 9, caractérisé en ce que ladite soudure entre ledit élément (2) et ladite surface d'accostage comprend au moins un quatrième cordon de soudure (23) sensiblement parallèle audit cordon supérieur (22).10. The assembly of claim 9, characterized in that said weld between said element (2) and said docking surface comprises at least a fourth weld bead (23) substantially parallel to said upper bead (22).
11. Procédé de fabrication d'un organe de liaison en tôle présentant au moins au voisinage de l'une au moins de ses extrémités une section ouverte, destiné à être soudé avec au moins un élément présentant au moins une portion dont la périphérie est complémentaire d'une zone d'accostage dudit organe de liaison, caractérisé en ce qu'il comprend une étape de formation d'au moins une surface d'accostage s'étendant essentiellement transversalement par rapport à ladite section ouverte et présentant une forme destinée à épouser ladite portion dudit élément.11. A method of manufacturing a sheet metal connecting member having at least in the vicinity of at least one of its ends an open section, intended to be welded with at least one element having at least one portion whose periphery is complementary of a docking area of said connecting member, characterized in that it comprises a step of forming at least one docking surface extending essentially transversely relative to said open section and having a shape intended to marry said portion of said element.
12. Procédé de fabrication selon la revendication 11, caractérisé en ce que ladite étape de formation est réalisée par emboutissage.12. The manufacturing method according to claim 11, characterized in that said forming step is carried out by stamping.
13. Matrice d'emboutissage destinée à emboutir un organe de liaison en tôle présentant au moins au voisinage de l'une au moins de ses extrémités une section ouverte, destiné à être soudé avec au moins un élément présentant au moins une portion dont la périphérie est complémentaire d'une zone d'accostage dudit organe de liaison, caractérisée en ce qu'elle comprend des moyens de formation d'au moins une surface d'accostage s'étendant essentiellement transversalement par rapport à ladite section ouverte et présentant une forme destinée à épouser ladite portion dudit élément.13. Stamping die intended to stamp a sheet metal connecting member having at least in the vicinity of at least one of its ends an open section, intended to be welded with at least one element having at least one portion whose periphery is complementary to a docking area of said connecting member, characterized in that it comprises means for forming at least one docking surface extending essentially transversely relative to said open section and having a shape intended to match said portion of said element.
14. Véhicule automobile équipé d'au moins un organe de liaison en tôle présentant au moins au voisinage de l'une au moins de ses extrémités une section ouverte, destiné à être soudé avec au moins un élément présentant au moins une portion dont la périphérie est complémentaire d'une zone d'accostage dudit organe de liaison, caractérisé en ce que ladite zone d'accostage comprend au moins une surface d'accostage s'étendant essentiellement transversalement par rapport à ladite section ouverte et présentant une forme destinée à épouser ladite portion dudit élément. 14. Motor vehicle equipped with at least one sheet metal connecting member having at least in the vicinity of at least one of its ends an open section, intended to be welded with at least one element having at least one portion whose periphery is complementary to a docking area of said connecting member, characterized in that said docking area comprises at least one docking surface extending essentially transversely relative to said open section and having a shape intended to match said portion of said element.
PCT/FR2004/003304 2003-12-29 2004-12-17 Sheet metal connecting member which is intended to be welded to an element comprising a coupling surface, production method thereof, corresponding drawing die and vehicle WO2005072998A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04816437A EP1713650A1 (en) 2003-12-29 2004-12-17 Sheet metal connecting member which is intended to be welded to an element comprising a coupling surface, production method thereof, corresponding drawing die and vehicle
BRPI0418165-4A BRPI0418165A (en) 2003-12-29 2004-12-17 sheet metal connecting element to be welded to an element comprising a coupling surface, method of production thereof, corresponding drawing die and vehicle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0315514A FR2864514B1 (en) 2003-12-29 2003-12-29 SHEET BONDING MEMBER FOR WELDING WITH AN ELEMENT COMPRISING A BURST SURFACE, METHOD OF MANUFACTURE, BINDING MATRIX AND VEHICLE THEREFOR
FR0315514 2003-12-29

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WO2005072998A1 true WO2005072998A1 (en) 2005-08-11

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BR (1) BRPI0418165A (en)
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US10081044B2 (en) * 2014-04-02 2018-09-25 Autotech Engineering Deutschland GmbH Method for producing a chassis link

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Also Published As

Publication number Publication date
EP1713650A1 (en) 2006-10-25
FR2864514B1 (en) 2007-02-23
FR2864514A1 (en) 2005-07-01
BRPI0418165A (en) 2007-06-19

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