FR2580985A1 - Method for assembling components made from cellular material, for example expanded polystyrene - Google Patents

Method for assembling components made from cellular material, for example expanded polystyrene Download PDF

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Publication number
FR2580985A1
FR2580985A1 FR8506345A FR8506345A FR2580985A1 FR 2580985 A1 FR2580985 A1 FR 2580985A1 FR 8506345 A FR8506345 A FR 8506345A FR 8506345 A FR8506345 A FR 8506345A FR 2580985 A1 FR2580985 A1 FR 2580985A1
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FR
France
Prior art keywords
expanded polystyrene
along
cellular material
line
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR8506345A
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French (fr)
Other versions
FR2580985B1 (en
Inventor
Jean-Francois Bogard
Jean Fouquet
Jacques Macler
Robert Pascal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Automobiles Peugeot SA
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Automobiles Peugeot SA
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 Automobiles Peugeot SA filed Critical Automobiles Peugeot SA
Priority to FR8506345A priority Critical patent/FR2580985B1/en
Publication of FR2580985A1 publication Critical patent/FR2580985A1/en
Application granted granted Critical
Publication of FR2580985B1 publication Critical patent/FR2580985B1/en
Expired legal-status Critical Current

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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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • B22C7/026—Patterns made from expanded plastic materials by assembling preformed parts
    • 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/137—Beaded-edge joints or bead seals
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/727—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 structure of the material of the parts to be joined being porous, e.g. foam
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • 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
    • B29L2031/757—Moulds, cores, dies

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The invention relates to a method for assembling components made from cellular material, for example expanded polystyrene. This method is characterised in that, a bead 15, 16 of the same material is provided, in an extra thickness, on each of the components to be assembled, along a joining line, and in that a heating blade 18, raised to a temperature above the melting point of the material, is applied along the said joining line until the beads are flattened out, causing them to self-amalgamate (fusion-bond). Application to the production of complex shapes made from plastic foam, especially for foundry patterns.

Description

La présente invention consiste en un procédé permettant d'assembler entre elles des pièces en matériau alvéolaire, par exemple en polystyrène expansé, en vue de réaliser un ensemble de formes complexes. The present invention consists of a method for joining together parts of cellular material, for example expanded polystyrene, in order to produce a set of complex shapes.

De tels ensembles sont utilisés, notamment en fonderie, dans le procédé connu sous le nom de "Lost-Foam" (mousse perdue). Dans ce procédé, une pièce en mousse de polystyrène, servant de nedèle et ayant donc exactement la forme de la pièce à réaliser en fonte, est noyée dans du sable qui remplit tous les espaces vides laissés autour ou même à l'intérieur de ce modèle Ce dernier se volatilise instantanément au contact du métal liquide qui occupe ainsi la place libérée par le modèle. Such assemblies are used, in particular in foundry, in the process known under the name of "Lost-Foam" (lost foam). In this process, a piece of polystyrene foam, serving as a nedele and therefore having exactly the shape of the piece to be made of cast iron, is embedded in sand which fills all the empty spaces left around or even inside this model. The latter instantly volatilizes on contact with the liquid metal, which thus occupies the space freed up by the model.

Après solidification du métal, il ne reste plus qu'à dégager la pièce du sable qui l'entourait.After the metal has solidified, all that remains is to free the part from the sand that surrounded it.

On comprend que, pour obtenir des pièces de formes complexes, il est nécessaire d'assembler entre elles des pièces de formes plus simples, les zones d'assemblage devant être exemptes de défaut et parfaitement étanches. It is understood that, in order to obtain parts of complex shapes, it is necessary to assemble parts of simpler shapes together, the assembly zones having to be free from defects and perfectly sealed.

Un procédé connu consiste en un collage : un cordon de colle est déposé dans une gorge prévue à cet effet le long de la ligne de jonction entre les pièces à assembler. Malheureusement, ce procédé présente de nombreux inconvénients
- la pose du cordon de colle est longue et délicate;
- le produit est coûteux;
- les pièces doivent être maintenues pressées l'une contre l'autre pendant le temps de prise de la colle;
- la ligne de collage présente des défauts d'aspect qui se retrouvent sur la pièce coulée pouvant entraîner son rebut. A known method consists of bonding: a bead of adhesive is deposited in a groove provided for this purpose along the junction line between the parts to be assembled. Unfortunately, this process has many disadvantages
- the installation of the adhesive bead is long and delicate;
- the product is expensive;
- the parts must be kept pressed against each other during the setting time of the glue;
- the bonding line has appearance defects which are found on the casting which can lead to its scrap.

L'invention permet de remédier à ces inconvénients. The invention overcomes these drawbacks.

Elle concerne donc un procédé d'assemblage de pièces en matériau alvéolaire, par exemple en polystyrène expansé. Ce procédé est caractérisé en ce que l'on prévoit sur chacune des pièces à assembler, le long d'une ligne de jonction, un bourrelet de la même matière en surépaisseur, et que l'on applique, le long de ladite ligne de joint, une lame chauffante, portée à une température supérieure à la température de fusion du matériau , jusqu'à arasement des bourrelets, en provoquant un auto-soudage. It therefore relates to a method of assembling parts of cellular material, for example of expanded polystyrene. This method is characterized in that there is provided on each of the parts to be assembled, along a junction line, a bead of the same material in excess thickness, and that is applied, along said joint line , a heating blade, brought to a temperature above the melting temperature of the material, until the beads are leveled off, causing self-welding.

De préférence, la lame chauffante est revêtue d'une couche d'un produit empêchant son collage avec le matériau , par exemple une couche de polytétrafluoroéthylène (produit commercialisé sous le nom de Téflon). Preferably, the heating blade is coated with a layer of a product preventing it from sticking with the material, for example a layer of polytetrafluoroethylene (product sold under the name of Teflon).

De préférence encore, deux surfaces en regard des pièces à assembler sont d'abord pressées l'une contre l'autre, puis le procédé précédent est appliqué sur une ligne de joint correspondant à une autre surface de contact dont la direction est sensiblement parallèle à la ligne d'action de la force de serrage. More preferably, two surfaces facing the parts to be assembled are first pressed against each other, then the above method is applied to a joint line corresponding to another contact surface whose direction is substantially parallel to the line of action of the clamping force.

Un exemple d'application de l'invention fait l'objet de la description qui suit, en référence aux
Fig. 1 à 3 jointes qui représentent une partie d'un ensemble respectivement dans trois phases successives du procédé.An example of application of the invention is the subject of the description which follows, with reference to
Fig. 1 to 3 joints which represent part of an assembly respectively in three successive phases of the process.

Dans cet exemple, deux pièces A et B en polystyrène expansé doivent être assemblées pour réaliser un modèle destiné à la fabrication d'une pièce coulée présentant un vide intérieur 10 (Fig. 3). In this example, two parts A and B of expanded polystyrene must be assembled to produce a model intended for the manufacture of a cast part having an internal void 10 (FIG. 3).

Ces pièces sont en contact par une première surface 11, oblique, le long d'une arête 12, et par une autre surface 13. Le long de la ligne de joint 14 correspondant à la surface 13, chacune des pièces A et
B comporte un bourrelet 15, 16, en surépaisseur.These parts are in contact by a first oblique surface 11, along an edge 12, and by another surface 13. Along the joint line 14 corresponding to the surface 13, each of the parts A and
B comprises a bead 15, 16, in excess thickness.

L'assemblage est réalisé comme suit : un effort de serrage exercé suivant la direction F, par un serre flan 17, assure d'abord un bon contact entre les surfaces 11 et le long de l'arête 12. La ligne d'action de cet effort de serrage est sensiblement parallèle à la surface 13. Puis une lame chauffante 18, revêtue d'une couche de téflon 19, et portée à une température supérieure à la température de fusion du polystyrène, soit environ 200 C, est appliquée sur les bourrelets 15, 16. Cette lame 18 a une forme qui suit tous les contours et sinuosités de la ligne de joint 14. Elle est appliquée jusqu'à arasement des bourrelets 15, 16, en provoquant un auto-soudage des pièces A et B entre elles. The assembly is carried out as follows: a clamping force exerted in the direction F, by a blank clamp 17, first ensures good contact between the surfaces 11 and along the edge 12. The line of action of this clamping force is substantially parallel to the surface 13. Then a heating blade 18, coated with a layer of Teflon 19, and brought to a temperature higher than the melting point of the polystyrene, that is to say about 200 ° C., is applied to the beads 15, 16. This blade 18 has a shape which follows all the contours and sinuosities of the joint line 14. It is applied until the beads 15, 16 are leveled, by causing a self-welding of the parts A and B between they.

Un trou 20, ménagé dans la pièce B, permet ensuite la pénétration d'un produit protecteur dans le vide intérieur 10, avant mise en place de l'ensemble dans un moule rempli de sable qui pénètre à son tour par ce trou 20 pour remplir le vide 10. Le métal en fusion prendra ensuite exactement la place précédemment occupée par le polystyrène. A hole 20, formed in the part B, then allows the penetration of a protective product into the internal vacuum 10, before placing the assembly in a mold filled with sand which in turn penetrates through this hole 20 to fill the vacuum 10. The molten metal will then take exactly the place previously occupied by the polystyrene.

Ce procédé est particulièrement intéressant car le cycle pression-soudage-maintien-relâchement est très rapide et la ligne de soudure est exempte de défaut d'aspect. This process is particularly interesting because the pressure-weld-hold-release cycle is very fast and the weld line is free from appearance defects.

La soudure étant effectuée alors qu'un effort de serrage est exercé entre les pièces, les autres zones de contact forment une jonction parfaitement étanche ce qui évitera tout défaut dans la pièce coulée.  The welding being carried out while a clamping force is exerted between the parts, the other contact zones form a perfectly sealed junction which will avoid any defect in the cast part.

Claims (5)

REVENDICATIONS 1. Procédé d'assemblage de pièces en matériau alvéolaire, caractérisé en ce que l'on prévoit sur chacune des pièces à assembler, le long d'une ligne de jonction, un bourrelet de la même matière en surépaisseur, et que l'on applique, le long de ladite ligne de joint une lame chauffante, portée à une température supérieure à la température de fusion du matériau, jusqu'à arasement des bourrelets, en provoquant un auto-soudage. 1. A method of assembling pieces of cellular material, characterized in that there is provided on each of the pieces to be joined, along a junction line, a bead of the same material in excess thickness, and that one applies, along said joint line a heating blade, brought to a temperature above the melting temperature of the material, until the beads are leveled, causing self-welding. 2. Procédé selon la revendication 1, caractérisé en ce que le matériau alvéolaire est du polystyrène expansé. 2. Method according to claim 1, characterized in that the foam material is expanded polystyrene. 3. Procédé selon la revendication 1 ou la revendication 2, caractérisé en ce que la lame chauffante est revêtue d'une couche d'un produit empêchant son collage avec la mousse. 3. Method according to claim 1 or claim 2, characterized in that the heating blade is coated with a layer of a product preventing its sticking with the foam. 4. Procédé selon la revendication 3, caractérisé en ce que ledit produit est du polytétrafluoroéthylène. 4. Method according to claim 3, characterized in that said product is polytetrafluoroethylene. 5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que deux surfaces en regard des pièces à assembler sont d'abord pressées l'une contre l'autre, puis le procédé selon la revendication 1 est appliqué sur une ligne de joint correspondant à une autre surface de contact dont la direction est sensiblement parallèle à la ligne d'action de la force de serrage.  5. Method according to any one of claims 1 to 4, characterized in that two surfaces facing the parts to be assembled are first pressed against each other, then the method according to claim 1 is applied to a joint line corresponding to another contact surface whose direction is substantially parallel to the line of action of the clamping force.
FR8506345A 1985-04-25 1985-04-25 PROCESS FOR ASSEMBLING PARTS OF ALVEOLAR MATERIAL, FOR EXAMPLE IN EXPANDED POLYSTYRENE Expired FR2580985B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8506345A FR2580985B1 (en) 1985-04-25 1985-04-25 PROCESS FOR ASSEMBLING PARTS OF ALVEOLAR MATERIAL, FOR EXAMPLE IN EXPANDED POLYSTYRENE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8506345A FR2580985B1 (en) 1985-04-25 1985-04-25 PROCESS FOR ASSEMBLING PARTS OF ALVEOLAR MATERIAL, FOR EXAMPLE IN EXPANDED POLYSTYRENE

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FR2580985A1 true FR2580985A1 (en) 1986-10-31
FR2580985B1 FR2580985B1 (en) 1987-09-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661850A1 (en) * 1990-05-10 1991-11-15 Outboard Marine Corp METHOD FOR MANUFACTURING FOAM MODEL SETS.
FR2684916A1 (en) * 1991-10-31 1993-06-18 Dunlop Automotives Composites MANUFACTURE OF PLASTIC ARTICLES.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2546208A (en) * 1949-04-30 1951-03-27 Injection Molding Company Method of sealing hollow bodies
GB692671A (en) * 1951-06-11 1953-06-10 Chloride Electrical Storage Co Improvements in the manufacture of plastic containers
FR2227110A1 (en) * 1973-04-27 1974-11-22 Cfea Welding joints in porous polyurethane foam sheet - without using adhesive or permanent clamps
FR2282328A1 (en) * 1974-08-19 1976-03-19 Dow Chemical Co METHOD AND APPARATUS FOR CARRYING OUT THE ASSEMBLY BY HOT WELDING OF ELEMENTS IN PLASTIC MATERIAL
GB1541412A (en) * 1976-02-02 1979-02-28 Cameron Price Ltd Securing components together
US4190093A (en) * 1978-11-02 1980-02-26 Ford Motor Company Vibration welding of expanded bead polystyrene

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2546208A (en) * 1949-04-30 1951-03-27 Injection Molding Company Method of sealing hollow bodies
GB692671A (en) * 1951-06-11 1953-06-10 Chloride Electrical Storage Co Improvements in the manufacture of plastic containers
FR2227110A1 (en) * 1973-04-27 1974-11-22 Cfea Welding joints in porous polyurethane foam sheet - without using adhesive or permanent clamps
FR2282328A1 (en) * 1974-08-19 1976-03-19 Dow Chemical Co METHOD AND APPARATUS FOR CARRYING OUT THE ASSEMBLY BY HOT WELDING OF ELEMENTS IN PLASTIC MATERIAL
GB1541412A (en) * 1976-02-02 1979-02-28 Cameron Price Ltd Securing components together
US4190093A (en) * 1978-11-02 1980-02-26 Ford Motor Company Vibration welding of expanded bead polystyrene

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661850A1 (en) * 1990-05-10 1991-11-15 Outboard Marine Corp METHOD FOR MANUFACTURING FOAM MODEL SETS.
US5086825A (en) * 1990-05-10 1992-02-11 Outboard Marine Corporation Method for manufacturing foam pattern assemblies
GB2243797B (en) * 1990-05-10 1994-04-27 Outboard Marine Corp Method for manufacturing foam pattern assemblies
FR2684916A1 (en) * 1991-10-31 1993-06-18 Dunlop Automotives Composites MANUFACTURE OF PLASTIC ARTICLES.
BE1006261A5 (en) * 1991-10-31 1994-07-05 Dunlop Automotive Composites U Manufacture of articles plastic.

Also Published As

Publication number Publication date
FR2580985B1 (en) 1987-09-25

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