EP0901850B1 - Verfahren zum Kleben von synthetischen brennbaren Materialien welche beim verlorenen Guss verwendet werden - Google Patents

Verfahren zum Kleben von synthetischen brennbaren Materialien welche beim verlorenen Guss verwendet werden Download PDF

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Publication number
EP0901850B1
EP0901850B1 EP19980402219 EP98402219A EP0901850B1 EP 0901850 B1 EP0901850 B1 EP 0901850B1 EP 19980402219 EP19980402219 EP 19980402219 EP 98402219 A EP98402219 A EP 98402219A EP 0901850 B1 EP0901850 B1 EP 0901850B1
Authority
EP
European Patent Office
Prior art keywords
glue
parts
approximately
aqueous emulsion
weight
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.)
Expired - Lifetime
Application number
EP19980402219
Other languages
English (en)
French (fr)
Other versions
EP0901850A1 (de
Inventor
José Solé
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
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen 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, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0901850A1 publication Critical patent/EP0901850A1/de
Application granted granted Critical
Publication of EP0901850B1 publication Critical patent/EP0901850B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a method of assembly by bonding of pyrolyzable plastic parts, especially expanded polystyrene, to form an imprint serving as a model lost during metal casting, of the lost pattern type.
  • a glue is used for gluing the parts of polystyrene hot-melt, e.g. phenolic resins, emulsions self-adhesive acrylics. These hot melt adhesives are applied to tempered. However, these hot melt adhesives have disadvantages.
  • the collage leaves traces along the joint on the model thus assembled. These traces, which are often thicker, form beads. The surfaces to be bonded must be substantially flat to limit the flow of hot-melt adhesives.
  • the thickness of the glue deposited constitutes a brake on the advance of the metal front by its volume gas generated hot during its pyrolysis. In addition, the thickness of glue deposited creates metallurgical defects by inclusions of condensates carbon generated during its pyrolysis.
  • the present invention therefore aims to overcome these drawbacks.
  • An object of the invention is to provide a method of assembling pieces of expanded polystyrene to form an imprint serving as lost model during casting of metals of the lost model type, this process being such that during the pyrolysis of polystyrene, it is released as little gas as possible and as little condensate as possible is formed.
  • Another object of the invention is to provide a process mentioned above which makes it possible to obtain metal parts whose surface of the joints has no bead or defect such as lips, chamfer.
  • Yet another object of the invention is to provide a method mentioned above which allows the bonding of curved or broken joints to reduce the cutting and decrease the number of parts of the model.
  • a fourth object of the invention is to provide a method mentioned above which allows a bonding temperature range very large.
  • Yet another object of the invention is to be able to use different heat sources for bonding.
  • the invention relates to a method of assembly by bonding of pyrolyzable plastic parts, such as expanded polystyrene, to form an imprint serving as a model lost during the casting of metals of the lost pattern type, by spraying of an aqueous emulsion glue on the parts to be glued, characterized in that a polyurethane-based adhesive is sprayed in aqueous emulsion, then the glue is dried by evaporating the water with heating, at a temperature between about 50 ° C to about 80 ° C, for a period of about 8 minutes to about 3 minutes.
  • pyrolyzable plastic parts such as expanded polystyrene
  • the invention further has the following features.
  • the polyurethane is an elastomer resulting from the polyaddition of a polyisocyanate and a polyester polyol, and the hardener is an aliphatic polyisocyanate.
  • the glue contains 3 to 15 parts by weight of hardener.
  • the adhesive is deposited at a thickness of between about 60 ⁇ m to about 400 ⁇ m.
  • the parts are assembled immediately after drying at a temperature above 65 ° C.
  • the pieces at rest for about a maximum of 4 hours if the temperature less than 65 ° C, then reheat the parts to a temperature between about 65 ° C and the temperature of deformation of plastic parts, for example for the expanded polystyrene, around 85 ° C.
  • the glue may also contain a dye, such as blue methylene.
  • the glue is dried by hot air, radiation infrared or microwave.
  • Methylene blue was introduced into the glue.
  • the addition of dye in the glue is intended to easily visualize the glue deposit applied to the white expanded polymer. We spray so as to obtain a layer of 100 ⁇ m, less than 400 ⁇ m to avoid drips and more than 60 ⁇ m to deposit the quantity of glue sufficient.
  • the adhesive deposit applied by spraying allows, compared to the classic soak impregnation, to deposit a lot of thickness lower dry glue from 30 ⁇ m to 200 ⁇ m.
  • This thickness of glue very low prevents sagging, excess thickness, beads and allows to make very difficult curved or broken joints, even impossible to obtain by dipping or by heat sealing. We can thus reduce cuts of complicated models, such as cylinder heads, to reduce their price and improve the quality of the castings.
  • the glue is then dried by placing the pieces in an oven, evaporating the water by heating by infrared rays, at 60 ° C., for 8 minutes.
  • thermofusible glue based on phenolic resin. The deposit is made by soaking. The parts are dried and assembled. We obtains beads along the gluing line.
  • the adhesive according to the invention is pyrolysis by generating little gas and condensate.
  • the volume gas is much lower than the gas flow of an adhesive from the prior art.

Claims (9)

  1. Verfahren zum Zusammenfügen durch Kleben von Teilen aus einem pyrolysierbaren synthetischen Material zur Erzeugung einer Gußform, die als verlorenes Modell beim Gießen von Metallen in einem Verfahren vom Typ der Gießverfahren mit verlorenem Modell dient, bei dem ein in wäßriger Emulsion vorliegender Klebstoff auf die zu verklebenden Teilen gesprüht wird, dadurch gekennzeichnet, daß ein Klebstoff auf der Basis von Polyurethanen in wäßriger Emulsion versprüht wird, wonach der Klebstoff durch Verdampfen des Wassers unter Erwärmen auf eine Temperatur, die im Bereich von etwa 50 bis etwa 80 °C liegt, während eines Zeitraums von etwa 8 bis etwa 3 min getrocknet wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß es sich bei dem pyrolysierbaren synthetischen Material um expandiertes Polystyrol handelt.
  3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der Klebstoff enthält:
    100 Gewichtsteile einer wäßrigen Emulsion, die besteht aus:
    · 50 bis 100 Gew.-% einer wäßrigen Emulsion eines Polyurethans,
    · 0 bis 50 Gew.% einer wäßrigen Emulsion eines Ethylen/Vinylacetat-Copolymers,
    · 0 bis 50 Gew.-% einer wäßrigen Emulsion eines Vinyl-, Acryloder Vinylacryl-Polymers,
       wobei der Trockensubstanzgehalt jeder Emulsion im Bereich von 40 bis 70 % liegt,
    0 bis 20 Gewichtsteile eines Härters, der unter den Polyisocyanaten ausgewählt ist.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Klebstoff in einer Dicke von etwa 60 bis etwa 400 µm aufgetragen wird.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Klebstoff bei einer Temperatur oberhalb von 65 °C getrocknet wird und daß die Teile unmittelbar nach der Trocknung zusammengefügt werden.
  6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Klebstoff bei einer Temperatur unterhalb von 65 °C getrocknet wird, daß man die Teile etwa maximal 4 h ruhen läßt und daß die Teile wieder auf eine Temperatur im Bereich von etwa 65 °C bis zur Verformungstemperatur der Teile aus dem synthetischen Material erwärmt werden.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die Teile wieder auf etwa 85 °C erwärmt werden.
  8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Klebstoff einen Farbstoff enthält, wie z.B. Methylenblau.
  9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Trocknung des Klebstoffs mit heißer Luft, Infrarotstrahlung oder Mikrowellenstrahlung durchgeführt wird.
EP19980402219 1997-09-10 1998-09-09 Verfahren zum Kleben von synthetischen brennbaren Materialien welche beim verlorenen Guss verwendet werden Expired - Lifetime EP0901850B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9711220A FR2768068B1 (fr) 1997-09-10 1997-09-10 Procede d'assemblage par collage de pieces en matiere synthetique pyrolysable pour le moulage en fonderie du type a modele perdu
FR9711220 1997-09-10

Publications (2)

Publication Number Publication Date
EP0901850A1 EP0901850A1 (de) 1999-03-17
EP0901850B1 true EP0901850B1 (de) 2003-05-21

Family

ID=9510915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980402219 Expired - Lifetime EP0901850B1 (de) 1997-09-10 1998-09-09 Verfahren zum Kleben von synthetischen brennbaren Materialien welche beim verlorenen Guss verwendet werden

Country Status (4)

Country Link
EP (1) EP0901850B1 (de)
DE (1) DE69814770T2 (de)
ES (1) ES2194286T3 (de)
FR (1) FR2768068B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2959145B1 (fr) * 2010-04-23 2013-01-04 Peugeot Citroen Automobiles Sa Procede de realisation par moulage d'une piece mecanique comportant des formes complexes et evolutives, notamment d'une culasse de vehicule
FR2960457B1 (fr) * 2010-05-28 2012-07-20 Peugeot Citroen Automobiles Sa Ensemble de strates, moule, procedes de confection de ce modele et de fabrication d'une piece a partir de ce modele
FR3021567B1 (fr) 2014-05-27 2016-05-27 Peugeot Citroen Automobiles Sa Procede de realisation d'un modele perdu destine a etre utilise en fonderie
CN115703945A (zh) * 2021-08-16 2023-02-17 长春理工大学 一种基于破乳诱导快速固化技术制备粘合涂层的方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2681002B1 (fr) * 1991-09-09 1994-01-21 Mousserolles Fonderies Ateliers Procede de collage des demi-coquilles en polystyrene expanse pour moulage en fonderie du type a modele perdu.
DE4213169C2 (de) * 1992-04-22 1994-02-24 Albert Common Modellbau Gmbh Vorrichtung zum Verkleben eines vorgeschäumten Modells für ein Gießverfahren

Also Published As

Publication number Publication date
FR2768068A1 (fr) 1999-03-12
EP0901850A1 (de) 1999-03-17
DE69814770D1 (de) 2003-06-26
DE69814770T2 (de) 2004-03-18
ES2194286T3 (es) 2003-11-16
FR2768068B1 (fr) 1999-10-08

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