EP0599680A1 - Verfahren zur Herstellung von Metallteilen durch Vollformgiessen, sowie danach hergestelltes Modell mit integriertem hohlen Einsatz und mit diesem Modell hergestellte Metallteile - Google Patents

Verfahren zur Herstellung von Metallteilen durch Vollformgiessen, sowie danach hergestelltes Modell mit integriertem hohlen Einsatz und mit diesem Modell hergestellte Metallteile Download PDF

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Publication number
EP0599680A1
EP0599680A1 EP93402679A EP93402679A EP0599680A1 EP 0599680 A1 EP0599680 A1 EP 0599680A1 EP 93402679 A EP93402679 A EP 93402679A EP 93402679 A EP93402679 A EP 93402679A EP 0599680 A1 EP0599680 A1 EP 0599680A1
Authority
EP
European Patent Office
Prior art keywords
model
hollow
pattern
insert
metal part
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.)
Withdrawn
Application number
EP93402679A
Other languages
English (en)
French (fr)
Inventor
Eric Lenoir
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 EP0599680A1 publication Critical patent/EP0599680A1/de
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould

Definitions

  • the invention relates to a manufacturing method by molding in a lost model of metal parts which must include at least one hollow, from models made of expandable polymer.
  • the invention also relates to the model with hollow insert obtained according to this method, as well as the metal part obtained using this model.
  • the lost model molding process consists in making an expandable polymer model having the shape of the metal part to be obtained, introducing this model into a sandbox and pouring liquid metal which follows the shape of the model during that the polymer model vaporizes and disappears.
  • One of these methods consists in first manufacturing model parts comprising recesses, in assembling or gluing these model parts so that the faces comprising the recesses are joined to form a model comprising a hollow having the desired shape.
  • a model is obtained comprising the beads of glue which cause irregularities, on the internal surface of the conduits of the final metal part obtained by casting the metal on this model. These irregularities disturb the flow of fluid inside these conduits. Furthermore, a lack of glue at one or more points of these beads can cause liquid metal to leak during the molding of the metal part in the sandbox.
  • the object of the invention is to remedy these drawbacks by proposing a method of manufacturing metal parts comprising a recess without surface irregularities, from a one-piece expandable polymer model comprising a recess.
  • the subject of the invention is a method of manufacturing metal parts by molding in a lost model from an expandable polymer model, characterized in that it consists in introducing a hollow polymer insert into the manufacturing mold. of the model, to carry out the molding of the model in said mold, to unmold the model with the hollow insert associated therewith and, to carry out using the model the molding of said metal part which will include a hollow in the form from the hollow of the insert.
  • the hollow polymer insert disappears with the model during the casting of the metal part.
  • the hollow of the polymer insert is filled with a material before being introduced into the mold for manufacturing the model.
  • the hollow of the polymer insert is filled with sand or connected to a water circuit, for filling it with water and cooling it during the manufacture of the model.
  • the mold for manufacturing the model has recesses to hold the hollow insert in place in the mold.
  • the filling material of the hollow polymer insert is removed after demolding the model in order to obtain a finished model comprising said hollow insert.
  • the model obtained by the method according to the invention comprises a hollow insert incorporated.
  • the metal part molded from this model has a hollow like the hollow of the insert.
  • Figure 1 is a sectional view of a mold for the manufacture of a model for use in the lost model molding process according to the invention.
  • Figure 2 is a sectional view of a model out of its manufacturing mold.
  • the method according to the invention consists first of all in producing, by extrusion blow-molding or by another technique making it possible to shape plastics of small thickness, a hollow shape which will serve as insert 1.
  • This hollow insert 1 is placed in a mold 2 which has the shape of the model M of expandable polymer which it is desired to obtain.
  • Balls 3 of expandable polymer are injected at 6 into the mold 2, and steam is sent through the walls of the mold. Steam circulates in these expandable polymer beads 3 and sets these beads solid.
  • the steam is then stabilized in order to obtain homogeneous cooking of the model, then the assembly is cooled.
  • a first solution consists in filling the hollow insert 1 with a material 4 such as by example of sand.
  • the mold 2 consisting for example of two half-shells 2a, 2b, has recesses 5 formed in the internal wall of each half-shell of the mold.
  • a second solution consists in connecting the hollow insert 1 to a water circuit (not shown), to fill the insert with water and cool it during the manufacturing operations of the model.
  • the M model with its incorporated insert is then removed from the mold and the filling product is removed from the insert.
  • the polymer insert 1 is therefore part of the model M which then has a hollow.
  • This model M consequently forms a single block which therefore has no roughness at the level of its hollow part visible at 7 in FIG. 2 and delimited by the hollow polymer insert 1.
  • the M model is then placed in a sandbox (not shown) and liquid metal is poured on this M model.
  • the metal takes the form of the M model while the M model itself vaporizes on contact with the molten metal. .
  • the insert 1 disappears at the same time as the rest of the model M and the metal part obtained (not shown) has a recess having the shape of the recess 7 of the insert 1 of the model M.
  • This method of manufacturing metal parts can be implemented for the manufacture of all parts comprising various hollow shapes, such as for example water circuits, oil circuits, intake pipes, exhaust pipes or cylinder heads.
  • the filling material of the hollow insert can be of any suitable nature.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP93402679A 1992-11-23 1993-10-29 Verfahren zur Herstellung von Metallteilen durch Vollformgiessen, sowie danach hergestelltes Modell mit integriertem hohlen Einsatz und mit diesem Modell hergestellte Metallteile Withdrawn EP0599680A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9214045 1992-11-23
FR9214045A FR2698296B1 (fr) 1992-11-23 1992-11-23 Procédé de fabrication de pièces métalliques par moulage en modèle perdu, modèle avec insert creux incorporé obtenu par ce procédé et pièce métallique obtenue à l'aide de ce modèle.

Publications (1)

Publication Number Publication Date
EP0599680A1 true EP0599680A1 (de) 1994-06-01

Family

ID=9435796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402679A Withdrawn EP0599680A1 (de) 1992-11-23 1993-10-29 Verfahren zur Herstellung von Metallteilen durch Vollformgiessen, sowie danach hergestelltes Modell mit integriertem hohlen Einsatz und mit diesem Modell hergestellte Metallteile

Country Status (2)

Country Link
EP (1) EP0599680A1 (de)
FR (1) FR2698296B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2109779A1 (en) * 1971-03-02 1972-09-07 Correcta-Werke GmbH, 3590 Bad WiIdungen Hollow lost wax foundry mould pattern - is pressurised during mould making
EP0305653A1 (de) * 1987-08-29 1989-03-08 EISENGIESSEREI MONFORTS GMBH & CO Gusskörpermodell und Verfahren zum Herstellen eines hohlen Gusskörpers
JPH02169147A (ja) * 1988-12-23 1990-06-29 Aisin Takaoka Ltd 中子付消失模型の成形方法
EP0506123A1 (de) * 1991-03-29 1992-09-30 Asahi Tec Corporation Verfahren zur Herstellung von einem verlorenen Modell

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2109779A1 (en) * 1971-03-02 1972-09-07 Correcta-Werke GmbH, 3590 Bad WiIdungen Hollow lost wax foundry mould pattern - is pressurised during mould making
EP0305653A1 (de) * 1987-08-29 1989-03-08 EISENGIESSEREI MONFORTS GMBH & CO Gusskörpermodell und Verfahren zum Herstellen eines hohlen Gusskörpers
JPH02169147A (ja) * 1988-12-23 1990-06-29 Aisin Takaoka Ltd 中子付消失模型の成形方法
EP0506123A1 (de) * 1991-03-29 1992-09-30 Asahi Tec Corporation Verfahren zur Herstellung von einem verlorenen Modell

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 428 (M - 1025)<4371> 14 September 1990 (1990-09-14) *

Also Published As

Publication number Publication date
FR2698296A1 (fr) 1994-05-27
FR2698296B1 (fr) 1994-12-30

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