FR2982791A1 - Method for realizing thermoplastic material part i.e. tailgate, of car, involves providing housing having set of riveting rods and set of reference ribs, and positioning structural insert on another housing - Google Patents

Method for realizing thermoplastic material part i.e. tailgate, of car, involves providing housing having set of riveting rods and set of reference ribs, and positioning structural insert on another housing Download PDF

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Publication number
FR2982791A1
FR2982791A1 FR1160464A FR1160464A FR2982791A1 FR 2982791 A1 FR2982791 A1 FR 2982791A1 FR 1160464 A FR1160464 A FR 1160464A FR 1160464 A FR1160464 A FR 1160464A FR 2982791 A1 FR2982791 A1 FR 2982791A1
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France
Prior art keywords
structural insert
box
housing
rods
thermoplastic material
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Granted
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FR1160464A
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French (fr)
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FR2982791B1 (en
Inventor
Jean Francois Lerooy
Olivier Glaumot
Francois Regnault
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Renault SAS
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Renault SAS
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • B29C65/606—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/782—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined
    • B29C65/7823—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined by using distance pieces, i.e. by using spacers positioned between the parts to be joined and forming a part of the joint
    • B29C65/7829—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined by using distance pieces, i.e. by using spacers positioned between the parts to be joined and forming a part of the joint said distance pieces being integral with at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/343—Making tension-free or wrinkle-free joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J5/00—Doors
    • B60J5/04—Doors arranged at the vehicle sides
    • B60J5/048—Doors arranged at the vehicle sides characterised by the material
    • B60J5/0481—Doors arranged at the vehicle sides characterised by the material plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J5/00—Doors
    • B60J5/10—Doors arranged at the vehicle rear
    • B60J5/101—Doors arranged at the vehicle rear for non-load transporting vehicles, i.e. family cars including vans
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/301—Three-dimensional joints, i.e. the joined area being substantially non-flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3055—Cars

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

The method involves realizing a structural insert (2) with holes (4), and providing a housing (8) having a set of riveting rods (6) and a set of reference ribs (10). The structural insert is positioned on the housing. Distance (12) between the structural insert and each reference rib is measured for each riveting rod. Another housing is provided with another set of riveting rods and another set of reference ribs. The structural insert is positioned on the latter housing. The latter set of rods of the latter housing is staked.

Description

Procédé de réalisation d'une pièce en matière thermoplastique d'un véhicule automobile et hayon arrière réalisé par un tel procédé Domaine technique de l'invention L'invention concerne un procédé de réalisation d'une pièce en matière thermoplastique d'un véhicule automobile, ladite pièce étant constituée d'un caisson sur lequel est bouterollé un insert structurel percé. L'invention concerne également un hayon arrière d'un véhicule automobile réalisé au moyen d'un tel procédé.TECHNICAL FIELD OF THE INVENTION The invention relates to a method for producing a thermoplastic part of a motor vehicle, said part consisting of a box on which is studded a pierced structural insert. The invention also relates to a tailgate of a motor vehicle made by means of such a method.

Etat de la technique Classiquement, les hayons arrière de véhicule automobile sont constitués d'un caisson thermoplastique bouterollé sur un insert structurel également en matériau thermoplastique. Ces pièces sont réalisées par moulage. Chaque pièce présente des défauts de géométrie en sortie de moulage. Lorsque le hayon est assemblé, les différentes pièces constitutives du hayon sont conformées sur un moyen spécifique propre à la fabrication de chaque pièce, puis assemblées par bouterollage. Mais, quand les pièces sont relâchées du moyen, l'ensemble se vrille sous l'effet de la libération des contraintes de conformation.State of the art conventionally, the tailgates of a motor vehicle consist of a thermoplastic box studded on a structural insert also thermoplastic material. These parts are made by molding. Each piece has defects in geometry at the output of the molding. When the tailgate is assembled, the various components of the hatchback are shaped on a specific means specific to the manufacture of each piece, then assembled by pegging. But when the parts are released from the means, the whole is twisted under the effect of the release of conformational constraints.

Le problème est parfois résolu par la réalisation de l'insert en matière métallique au lieu de matière thermoplastique moulé. Ainsi, l'insert peut être moulé avec une plus grande précision et il ne présente pas de défauts de géométrie notables. Toutefois, cette solution est coûteuse et lourde, parce qu'elle impose la réalisation de pièces métalliques et nécessite des investissements particuliers, et cette solution est difficilement recyclable.The problem is sometimes solved by producing the metal insert instead of molded thermoplastic material. Thus, the insert can be molded with greater accuracy and it does not present significant geometry defects. However, this solution is expensive and cumbersome, because it requires the production of metal parts and requires special investments, and this solution is difficult to recycle.

Objet de l'invention La présente invention a pour objet un procédé de fabrication d'une pièce en matière thermoplastique qui remédie à ces inconvénients.OBJECT OF THE INVENTION The present invention relates to a method of manufacturing a thermoplastic material part which overcomes these disadvantages.

Plus particulièrement, le procédé de réalisation selon l'invention est caractérisé en ce qu'il comporte au moins les étapes suivantes : réalisation d'un insert structurel percé par moulage ; réalisation d'un premier caisson comportant des premières tiges de bouterollage et, à côté de chaque tige de bouterollage, une première nervure de référence associée ; positionnement de l'insert structurel sur le premier caisson ; mesure, pour chaque première tige de bouterollage, d'une distance entre l'insert structurel et chaque première nervure de référence associée ; réalisation d'un second caisson comportant des secondes tiges de bouterollage et, à côté de chaque seconde tige de bouterollage, une seconde nervure de référence, dans lequel la hauteur de chaque seconde nervure de référence a été modifiée en fonction de ladite distance mesurée lors de l'étape précédente, entre l'insert structurel et lesdites premières nervures de référence du premier caisson ; positionnement de l'insert structurel sur le second caisson ; bouterollage des secondes tiges de bouterollage du second caisson.More particularly, the production method according to the invention is characterized in that it comprises at least the following steps: production of a structural insert pierced by molding; producing a first box having first pegs and, next to each peg, a first associated reference rib; positioning the structural insert on the first box; measuring, for each first cutter rod, a distance between the structural insert and each associated first reference rib; producing a second box comprising second blocking rods and, next to each second blocking rod, a second reference rib, in which the height of each second reference rib has been modified as a function of said distance measured during the preceding step, between the structural insert and said first reference ribs of the first box; positioning the structural insert on the second box; bouterollage of the second rods of bérollollage of the second caisson.

L'assemblage ainsi obtenu est alors un ensemble composé d'un caisson conforme assemblé à un insert structurel sans contrainte interne. Le résultat final est donc une pièce en matière thermoplastique stable et géométriquement correct.The assembly thus obtained is then an assembly consisting of a conformal box assembled to a structural insert without internal stress. The end result is therefore a piece of stable thermoplastic material and geometrically correct.

Le procédé de réalisation peut comporter avantageusement, avant l'étape de bouterollage des secondes tiges de bouterollage du second caisson, une étape de positionnement d'au moins un plot de calage en matériau thermo expansif, entre le second caisson et l'insert structurel, à proximité de chaque seconde tige de bouterollage.The production method may advantageously comprise, before the step of peeling the second rods of the second casing, a step of positioning at least one wedge of thermo-expansive material between the second casing and the structural insert, near each second basting rod.

Dans ce cas, le procédé de réalisation peut comporter une étape de passage de ladite pièce dans une installation thermique, de façon à ce que le matériau de chaque plot de calage soit expansé.In this case, the production method may include a step of passing said part in a thermal installation, so that the material of each wedging pad is expanded.

De tels plots de calage permettent notamment d'optimiser la tenue de la pièce ainsi assemblée. L'invention a également pour objet un hayon arrière de véhicule automobile, caractérisé en ce qu'il est réalisé au moyen d'un tel procédé de réalisation. Un tel hayon arrière en matière thermoplastique présente ainsi tous les avantages mentionnés ci-dessus, notamment la bonne tenue de la pièce et la bonne géométrie d'assemblage.30 Description sommaire des dessins D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre de modes particuliers de réalisation de l'invention donnés à titre d'exemples non limitatifs et représentés aux dessins annexés, dans lesquels : La figure 1 est une vue schématique en coupe d'un premier caisson, présentant des premières nervures de référence, positionné sous un insert structurel, dans une étape du procédé de réalisation selon l'invention. Les figures 2 et 3 illustrent, respectivement avant bouterollage (figure 2) et après bouterollage (figure 3), l'assemblage d'un insert structurel sur un second caisson présentant des nervures de référence ajustées, dans une autre étape du procédé de réalisation selon l'invention. Description de modes particuliers de réalisation Sur la figure 1, dans une première étape du procédé de réalisation selon l'invention, un insert structurel 2 en matériau thermoplastique est réalisé par moulage. L'insert structurel 2 comporte des trous 4 destinés à recevoir des tiges de bouterollage 6 d'un premier caisson 8. Il faut noter ici que l'insert structurel 2 est nécessairement « faux », parce que, avec les techniques de fabrication actuelles, il n'est pas possible d'obtenir des cotes présentant une faible tolérance de fabrication. En revanche, la dispersion gaussienne des cotes est faible. En d'autres termes, il est possible de produire de manière répétitive des pièces en grande série, qui présentent toutes les mêmes défauts de fabrication et qui sont donc interchangeables les unes avec les autres.Such studs allow in particular to optimize the holding of the piece thus assembled. The invention also relates to a rear hatch of a motor vehicle, characterized in that it is achieved by means of such a method of production. Such a tailgate thermoplastic and has all the advantages mentioned above, including the good strength of the part and the good assembly geometry.30 Brief description of the drawings Other advantages and features will become more clearly apparent from the description which will follow of particular embodiments of the invention given as non-limiting examples and shown in the accompanying drawings, in which: Figure 1 is a schematic sectional view of a first box, having first reference ribs, positioned in a structural insert, in a step of the production method according to the invention. FIGS. 2 and 3 illustrate, respectively before jamming (FIG. 2) and after jamming (FIG. 3), the assembly of a structural insert on a second box having adjusted reference ribs, in another step of the production method according to FIG. the invention. DESCRIPTION OF PARTICULAR EMBODIMENTS In FIG. 1, in a first step of the production method according to the invention, a structural insert 2 made of thermoplastic material is produced by molding. The structural insert 2 has holes 4 for receiving cutter rods 6 of a first box 8. It should be noted here that the structural insert 2 is necessarily "false" because, with the current manufacturing techniques, it is not possible to obtain dimensions with a low manufacturing tolerance. On the other hand, the Gaussian dispersion of the ratings is weak. In other words, it is possible to repeatedly produce parts in large series, all of which have the same manufacturing defects and are therefore interchangeable with each other.

Sur la figure 1, un premier caisson 8 en matière thermoplastique est réalisé. Il est destiné plus particulièrement à jouer le rôle d'un premier caisson test de mesure, apte à déterminer justement les dimensions de l'insert structurel 2, à savoir en tenant compte des éventuels défauts de géométrie de l'insert structurel 2, comme indiqué ci-dessus. Le premier caisson 8 présente des premières tiges de bouterollage 6 destinées à pénétrer dans les trous 4 de l'insert structurel 2. En plus des premières tiges de bouterollage 6, le premier caisson 8 comporte des premières nervures de référence 10 au voisinage de chaque tige de bouterollage 6.In Figure 1, a first box 8 of thermoplastic material is produced. It is intended more particularly to play the role of a first measuring test box, able to precisely determine the dimensions of the structural insert 2, namely taking into account any geometry defects of the structural insert 2, as indicated above. The first box 8 has first cutter rods 6 intended to penetrate into the holes 4 of the structural insert 2. In addition to the first cutter rods 6, the first box 8 has first reference ribs 10 in the vicinity of each rod snapping 6.

Contrairement à l'insert structurel 2 qui est rigide, le premier caisson 8 est réalisé, de préférence, dans une matière souple. Il peut être conformé sans contraintes selon une forme théorique, c'est-à-dire dépendant de la pièce à réaliser. En d'autres termes, la conformation selon une forme théorique signifie avoir la capacité grâce à sa souplesse de se conformer selon une forme définie numériquement, notamment par des logiciels de conception assistée par ordinateur (CAO). Une telle pièce « fausse », de par sa souplesse, permet ainsi une conformation suivant une géométrie prédéterminée souhaitée, en l'occurrence la géométrique « exacte » théorique souhaitée. Sur la figure 1, les premières nervures de référence 10 sont prévues suffisamment courtes pour qu'un espace, ou écart, existe entre l'extrémité de chaque nervure de référence 10 et la face de l'insert structurel 2. La distance 12 correspondant à cet écart est plus ou moins grande en fonction du vrillage de l'insert structurel 2 après moulage et conformation, à savoir en fonction des défauts éventuels de géométrie de l'insert structurel 2 après moulage. Ainsi, le principe du procédé selon l'invention consiste à effectuer une étape de mesure, à l'aide du premier caisson 8 et pour chaque tige de bouterollage 6, et donc pour chaque nervure de référence 10 associée, de la distance 12, ou écart, entre l'extrémité de chaque nervure de référence 10 et la face inférieure de l'insert structurel 2. A titre d'exemple, de telles mesures peuvent être réalisées par une machine de mesure tridimensionnelle, équipée par exemple d'un palpeur de forme, embarqué au bout d'un bras d'un robot de mesure. La méthode de mesure associée permet ainsi de comparer la situation d'un point palpé par le palpeur par rapport à une définition numérique de la surface, réalisée par exemple par CAO. Ainsi, les écarts sont mesurés entre le point fabriqué et le point théorique et il est possible de mesurer des écarts de distances par différence des cotes entre les deux points qui circonscrivent ladite distance. Sur les figures 2 et 3, suite à ces mesures effectuées à l'aide du premier caisson 8, le procédé selon l'invention consiste alors à fabriquer, dans une étape ultérieure, un second caisson 14, comportant des secondes nervures de référence 16, dont la hauteur a été modifiée, à savoir augmentée ou diminuée, en fonction de ladite distance 12 mesurée lors de l'étape décrite précédemment à l'aide du premier caisson 8. Le second caisson 14 comporte alors des secondes tiges de bouterollage 18 associées à des secondes nervures de référence 16, par exemple, rehaussées (figure 2). Suite au positionnement du second caisson 14 ainsi ajusté sous l'insert structurel 2, à savoir avec les secondes nervures de référence 16 dont les dimensions sont ajustées en fonction de la géométrie de l'insert structurel 2, il est ensuite possible d'effectuer une opération de bouterollage des secondes tiges de bouterollage 18 du second caisson 14, comme cela est représenté sur la figure 3, et ce sans induire de déformation de l'insert structurel 2.Unlike the structural insert 2 which is rigid, the first box 8 is preferably made of a flexible material. It can be conformed without constraints in a theoretical form, that is to say dependent on the part to be produced. In other words, the conformation according to a theoretical form means having the capacity thanks to its flexibility to conform to a numerically defined form, in particular by computer-aided design (CAD) software. Such a "false" piece, by its flexibility, thus allows a conformation according to a desired predetermined geometry, in this case the desired "exact" theoretical geometry. In FIG. 1, the first reference ribs 10 are provided sufficiently short for a gap, or gap, to exist between the end of each reference rib 10 and the face of the structural insert 2. The distance 12 corresponding to this difference is greater or smaller depending on the twisting of the structural insert 2 after molding and conformation, ie depending on the possible defects in geometry of the structural insert 2 after molding. Thus, the principle of the method according to the invention consists in carrying out a measuring step, using the first box 8 and for each blocking rod 6, and therefore for each associated reference rib 10, the distance 12, or distance, between the end of each reference rib 10 and the lower face of the structural insert 2. For example, such measurements can be made by a three-dimensional measuring machine, equipped for example with a probe of form, embedded at the end of an arm of a measuring robot. The associated measurement method thus makes it possible to compare the situation of a point palpated by the probe with respect to a numerical definition of the surface, made for example by CAD. Thus, the differences are measured between the manufactured point and the theoretical point and it is possible to measure distance differences by difference of the dimensions between the two points which circumscribe said distance. In FIGS. 2 and 3, following these measurements carried out with the aid of the first box 8, the method according to the invention then consists in manufacturing, in a subsequent step, a second box 14, comprising second reference ribs 16, whose height has been modified, ie increased or decreased, as a function of said distance 12 measured during the step previously described using the first box 8. The second box 14 then comprises second pinning rods 18 associated with second reference ribs 16, for example, raised (Figure 2). Following the positioning of the second box 14 and adjusted under the structural insert 2, namely with the second reference ribs 16 whose dimensions are adjusted according to the geometry of the structural insert 2, it is then possible to perform a operation of pegging the second pins 18 of the second casing 14, as shown in Figure 3, without inducing deformation of the structural insert 2.

Sur la figure 3, la pièce en matière thermoplastique ainsi obtenue, à la fin du procédé de réalisation selon l'invention, est donc composée d'un second caisson 14 parfaitement conforme à la géométrie de l'insert structurel 2 sur lequel il est assemblé et sans contrainte interne. Avantageusement, comme représenté plus particulièrement sur la figure 3, le procédé de réalisation selon l'invention comporte, avant l'étape de bouterollage des secondes tiges de bouterollage 18 du second caisson 14, une étape de positionnement d'au moins un plot de calage 20 en matériau thermo expansif, entre le second caisson 14 et l'insert structurel 2, à proximité de chaque seconde tige de bouterollage 18. Le plot de calage 20 est, de préférence, du type mastic thermo expansif. Après l'étape de bouterollage, il est alors nécessaire de passer la pièce ainsi assemblée dans une installation thermique, de façon à ce que le matériau de chaque plot de calage 20 soit expansé pendant le chauffage.In FIG. 3, the piece of thermoplastic material thus obtained, at the end of the production method according to the invention, is thus composed of a second box 14 perfectly conforming to the geometry of the structural insert 2 on which it is assembled. and without internal constraint. Advantageously, as shown more particularly in FIG. 3, the production method according to the invention comprises, before the step of pegging the second pegs 18 of the second box 14, a step of positioning at least one blocking pad 20 of thermo-expansive material, between the second housing 14 and the structural insert 2, near each second cutter rod 18. The wedge pad 20 is preferably of the thermo-expansive mastic type. After the step of pegging, it is then necessary to pass the thus assembled part in a thermal installation, so that the material of each wedge pad 20 is foamed during heating.

L'invention s'applique à tout type de pièce d'un véhicule automobile. Plus particulièrement, l'invention s'applique à un hayon arrière de véhicule automobile, réalisé par un tel procédé de réalisation. Un tel hayon en matière thermoplastique présente ainsi des caractéristiques optimales en termes de stabilité et de géométrie, notamment grâce à son caisson parfaitement ajusté en fonction de la géométrie de son insert structurel associé.The invention applies to any type of part of a motor vehicle. More particularly, the invention applies to a rear hatch of a motor vehicle, produced by such a production method. Such a hatch made of thermoplastic material thus has optimum characteristics in terms of stability and geometry, in particular thanks to its box perfectly adjusted according to the geometry of its associated structural insert.

Claims (4)

REVENDICATIONS1. Procédé de réalisation d'une pièce en matière thermoplastique d'un véhicule automobile, ladite pièce étant constituée d'un caisson sur lequel est bouterolle un insert structurel percé, procédé caractérisé en ce qu'il comporte au moins les étapes suivantes : réalisation d'un insert structurel (2) percé (4) par moulage ; réalisation d'un premier caisson (8) comportant des premières tiges de bouterollage (6) et, à côté de chaque tige de bouterollage (6), une première nervure de référence (10) associée ; positionnement de l'insert structurel (2) sur le premier caisson (8) ; mesure, pour chaque première tige de bouterollage (6), d'une distance (12) entre l'insert structurel (2) et chaque première nervure de référence (10) associée ; réalisation d'un second caisson (14) comportant des secondes tiges de bouterollage (18) et, à côté de chaque seconde tige de bouterollage (18), une seconde nervure de référence (16), dans lequel la hauteur de chaque seconde nervure de référence (16) a été modifiée en fonction de ladite distance (12) mesurée lors de l'étape précédente, entre l'insert structurel (2) et lesdites premières nervures de référence (10) du premier caisson (8) ; positionnement de l'insert structurel (2) sur le second caisson (14) ; bouterollage des secondes tiges de bouterollage (18) du second caisson (14).REVENDICATIONS1. A method of producing a thermoplastic part of a motor vehicle, said part being constituted by a box on which is a boredolle a pierced structural insert, characterized in that it comprises at least the following steps: production of a structural insert (2) drilled (4) by molding; producing a first box (8) comprising first cutter rods (6) and, next to each cutter rod (6), a first reference rib (10) associated; positioning the structural insert (2) on the first box (8); measuring, for each first cutter rod (6), a distance (12) between the structural insert (2) and each associated first reference rib (10); producing a second box (14) comprising second blocking rods (18) and, next to each second blocking rod (18), a second reference rib (16), wherein the height of each second rib of reference (16) has been modified according to said distance (12) measured in the previous step, between the structural insert (2) and said first reference ribs (10) of the first box (8); positioning the structural insert (2) on the second box (14); bouterollage second stembers (18) of the second box (14). 2. Procédé selon la revendication précédente, caractérisé en ce qu'il comporte, avant l'étape de bouterollage des secondes tiges de bouterollage (18) du second caisson (14), une étape de positionnement d'au moins un plot de calage (20) en matériau thermo expansif, entre le second caisson (14) et l'insert structurel (2), à proximité de chaque seconde tige de bouterollage (18).2. Method according to the preceding claim, characterized in that it comprises, before the step of pegging the second rods of pebble (18) of the second box (14), a step of positioning at least one wedging pad ( 20) of thermoexpansive material, between the second box (14) and the structural insert (2), near each second blocking rod (18). 3. Procédé selon la revendication précédente, caractérisé en ce qu'il comporte une étape de passage de ladite pièce dans une installation thermique, de façon à ce que le matériau de chaque plot de calage (20) soit expansé.3. Method according to the preceding claim, characterized in that it comprises a step of passage of said part in a thermal installation, so that the material of each wedge pad (20) is expanded. 4. Hayon arrière d'un véhicule automobile réalisé au moyen d'un procédé de réalisation selon l'une quelconque des revendications précédentes.4. Rear tailgate of a motor vehicle made by means of a manufacturing method according to any one of the preceding claims.
FR1160464A 2011-11-17 2011-11-17 METHOD FOR PRODUCING A THERMOPLASTIC PIECE OF A MOTOR VEHICLE AND A REAR TAIL REALIZED BY SUCH A METHOD Expired - Fee Related FR2982791B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11236070A (en) * 1997-12-19 1999-08-31 Sekisui Chem Co Ltd Flange tightening structure for frp molding
JP2004058391A (en) * 2002-07-26 2004-02-26 Toyota Motor Corp Thermally caulking structure and method for thermally caulking and connecting
WO2011101412A1 (en) * 2010-02-18 2011-08-25 Faurecia Exteriors Gmbh Adaptation and customization of the surface contour of bodies to be connected, in particular during torsional ultrasonic welding

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11236070A (en) * 1997-12-19 1999-08-31 Sekisui Chem Co Ltd Flange tightening structure for frp molding
JP2004058391A (en) * 2002-07-26 2004-02-26 Toyota Motor Corp Thermally caulking structure and method for thermally caulking and connecting
WO2011101412A1 (en) * 2010-02-18 2011-08-25 Faurecia Exteriors Gmbh Adaptation and customization of the surface contour of bodies to be connected, in particular during torsional ultrasonic welding

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