EP0305653A1 - Modèle de fonderie et procédé de fabrication d'une pièce de coulée creuse - Google Patents

Modèle de fonderie et procédé de fabrication d'une pièce de coulée creuse Download PDF

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Publication number
EP0305653A1
EP0305653A1 EP88108579A EP88108579A EP0305653A1 EP 0305653 A1 EP0305653 A1 EP 0305653A1 EP 88108579 A EP88108579 A EP 88108579A EP 88108579 A EP88108579 A EP 88108579A EP 0305653 A1 EP0305653 A1 EP 0305653A1
Authority
EP
European Patent Office
Prior art keywords
foam body
cast
molded part
foam
refractory
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
EP88108579A
Other languages
German (de)
English (en)
Other versions
EP0305653B1 (fr
Inventor
Wilhelm Kallen
Ulrich Quack
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.)
Eisengiesserei Monforts GmbH and Co
Original Assignee
Eisengiesserei Monforts GmbH and Co
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 Eisengiesserei Monforts GmbH and Co filed Critical Eisengiesserei Monforts GmbH and Co
Priority to AT88108579T priority Critical patent/ATE70749T1/de
Publication of EP0305653A1 publication Critical patent/EP0305653A1/fr
Application granted granted Critical
Publication of EP0305653B1 publication Critical patent/EP0305653B1/fr
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
    • 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
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal

Definitions

  • the invention relates to a cast body model with a foam body for producing a hollow casting in the metal foundry, the foam body consisting of a material which decomposes in a gaseous manner in the heat of liquid metal, such as iron or aluminum, such as polystyrene particle foam or the like. It also relates to a method for producing the cast body model and a method for producing a hollow cast part.
  • models of the casting to be produced made of polystyrene particle foam or a similar plastic that decomposes gaseously by contact with liquid metal are used and are either embedded in binder-free molding material and, if appropriate, placed under reduced pressure together with this before and during casting or molded in bonded molding material.
  • the foam body consisting of polystyrene particle foam or the like is coated with a size customary in the foundry, e.g. B. treated by immersion, which can consist of a finely ground refractory containing slurry.
  • the surface facing the foam body forms the actual casting mold from its shell consisting of size, while the adjacent molding material, in particular sand, only serves to mechanically support the size shell, which is fragile like an egg shell.
  • a problem with this casting process arises from the manufacture of the cast body model itself. If it is a hollow model, four molds are used to manufacture it shells, namely two upper and two lower molds.
  • the finished, hardened foam body therefore consists of at least two shells, the boundary of which is inevitably apparent in the finished casting both on its outer and on its inner surface.
  • sizing penetrates between the abutting surfaces of adjacent parts of the foam body during the finishing of the foam body. Problems in this regard are particularly difficult to access parts, especially on the inside, of a hollow mold. Since the surface of the foam body facing the foam body forms the actual shape of the cast part to be produced, penetration projections that have penetrated into the foam body or in seams between foam body parts result in corresponding incisions in the resulting casting. If such cuts occur, scrap is created during casting.
  • Another problem with the casting process described arises from the fact that the foam used has a surface which is very sensitive to pressure or impact. Since, as said, the abutting edges of parts of the foam body to be assembled must remain as intact as possible, not only handling, but also storage and transportation are difficult. If a joint is worked inaccurately or is damaged during transport or handling, it can always be repaired by inserting a like the foam can be repaired in the heat of the liquid metal gaseous decomposing adhesive, such reworking is complex and in many cases, especially in inaccessible places on the inside of a hollow model, it is hardly feasible and verifiable with the required accuracy.
  • the invention has for its object to provide an undercut foam hollow model in principle, which has no seams or at least only seams where reworking possible damage or inaccuracies at the joints with tolerable effort, i.e. especially only on the outside .
  • the solution according to the invention for the above-mentioned cast body model with a foam body for producing the hollow cast part is that the contour of the foam body is covered on one side with a cast part to be produced in the cast part to be formed to form a corresponding part of the contour of the refractory mold.
  • the surface of the foam body which should not be reworked if possible, is to be covered with a refractory molded part which directly defines a contour of the cast part to be produced.
  • the term “refractory molded body” encompasses molded parts made of metallic or non-metallic material which can be molded directly into a cast metal part during casting and can form at least part of its outer surface. This includes metal parts made of sheet metal, cast iron or forged material, but also sintered materials, Ceramics, glass or the like.
  • the molded part can be provided as an insert part on the inner surface of a hollow cast part, but also as an envelope part on the outer surface of a cast part.
  • the invention also creates the possibility of producing a composite body consisting of different or differently alloyed metals or of metal and non-metal.
  • a hollow cast iron body can be cast, the inner contour of which is formed by a prefabricated insert made of sheet metal.
  • a composite body consisting of two metals can also be cast, which has, for example, an outer shell made of iron and a hollow inner part made of aluminum.
  • the many cast body variants to be produced according to the invention also include a cast iron part coated with ceramic or glass, internally or externally.
  • the foam body is seamlessly molded onto the refractory molded part.
  • the foam body can be molded onto the inner or outer surface of a hollow refractory molded part.
  • the molded part thus forms part of the shell of the hollow mold when the foam body is produced. It is essential that this procedure creates a one-piece foam body that does not have any seams that lead to errors or that need to be reworked.
  • the refractory molded part is to form an insert of the foam body into the cast body to be produced, it is sufficient to produce the complete one Foam model, a single shape corresponding to the intended outer contour of the foam body with a lower and upper shell, because an insert part determining the inner surface of the cast body to be produced is used as the core of this shape.
  • the outer shell of the foam body is to be covered with the refractory molded part.
  • the hollow foam body according to the invention is to be produced in one piece, unwanted incisions cannot occur - because of a missing seam - because the size to be applied to the foam body cannot penetrate into the body.
  • the upper and lower shell of an outer shape used to produce the foam body only burrs projecting outward can arise on the foam, which, however, can be reworked without problems.
  • the fireproof molded part covering at least part of the contour of the foam body can be covered with an insulating material jacket, in particular made of mineral fiber wool, on its surface facing the cast body to be produced.
  • an insulating material jacket in particular made of mineral fiber wool, on its surface facing the cast body to be produced.
  • the insulating liner is also favorable for components, e.g. B. in exhaust manifolds, which should have the lowest possible heat absorption. So that (in the exhaust gas flow) subsequent components, for. B. catalysts, get hot as quickly as possible.
  • the material jacket also offers the possibility of reducing the weight of the cast body without reducing its volume.
  • the jacket consisting of insulating material or the like can be provided not only on the inner or outer surface but also on the boundary of the different layers of a composite body according to the invention.
  • the use of the refractory molded part according to the invention is therefore also advantageous if, as in the chemical industry, a surface of a cast part has to be alloyed in a certain way in order to ensure the necessary chemical resistance.
  • a method for producing a hollow casting in the metal foundry using a foam body which decomposes in a gaseous manner in the heat of liquid metal, such as iron or aluminum, and in particular consists of polystyrene particle foam or the like, as a model that the foam body is one-sided during casting is covered with a refractory, as such to be included in the contour of the casting.
  • a foam body which decomposes in a gaseous manner in the heat of liquid metal, such as iron or aluminum, and in particular consists of polystyrene particle foam or the like, as a model that the foam body is one-sided during casting is covered with a refractory, as such to be included in the contour of the casting.
  • Fig. 1 shows a prepared mold for producing a cast body model according to the invention, generally designated 1.
  • 1 consists of a refractory molded part 2 and a one-piece foam body 3 to be molded thereon.
  • a mold consisting of an upper mold 4 and a lower mold 5, with a total of 6, is used as the mold for producing the foam body 3 designated outer shell used.
  • the drawing shows in FIG. 2 a section through a mold prepared for the iron foundry with a cast body model 1 according to FIG. 1.
  • the cast body model 1 consists, apart from the molded part 2 and the foam body 3, of an insulating material layer 8.
  • the entire cast body model 1 is embedded in a box 9 in binder-free molding material 10, in particular in sand, inside and outside, in particular vibrated, so that no cavity remains in box 9.
  • a pouring funnel 11 is attached to one end of the foam body 3.
  • the entire surface of the molding material 6 in the box 9 is surrounded with an airtight film 12 so that a vacuum pump acting into the molding material with an intake pipe 13 via a vacuum line 14 vent the interior of the film 12 or the box 9 so far can that the molding material 10, which preferably consists of free-flowing sand, becomes stiff overall.
  • the material of the foam body 3 is decomposed and drawn off in gaseous form via the vacuum line 14 to the extent that it is replaced by the liquid and solidifying iron.
  • the refractory molded part 2 (possibly also the insulating material layer 8) becomes part of the cast part produced.
  • the casting finally occupies the space that was originally displaced by the foam body 3 was.
  • the contour of the foam body 3, in the present case its outer contour 15, is or at the same time becomes the outer contour of the cast body.
  • FIG. 3 shows the case of a composite casting with an iron layer 17 on the outside and with a hollow aluminum body 19 with a passage 18 on the inside.
  • a foam body is provided on the inner surface of the iron body 18, for. B. directly foamed, which has a passage 18.
  • the passage 18 is filled with, for example, poured molding material.
  • the aluminum body 19 takes the place of the foam body.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP88108579A 1987-08-29 1988-05-28 Modèle de fonderie et procédé de fabrication d'une pièce de coulée creuse Expired - Lifetime EP0305653B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88108579T ATE70749T1 (de) 1987-08-29 1988-05-28 Gusskoerpermodell und verfahren zum herstellen eines hohlen gusskoerpers.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873728918 DE3728918A1 (de) 1987-08-29 1987-08-29 Gusskoerpermodell und verfahren zum herstellen eines hohlen gusskoerpers
DE3728918 1987-08-29

Publications (2)

Publication Number Publication Date
EP0305653A1 true EP0305653A1 (fr) 1989-03-08
EP0305653B1 EP0305653B1 (fr) 1991-12-27

Family

ID=6334789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88108579A Expired - Lifetime EP0305653B1 (fr) 1987-08-29 1988-05-28 Modèle de fonderie et procédé de fabrication d'une pièce de coulée creuse

Country Status (6)

Country Link
US (1) US4942915A (fr)
EP (1) EP0305653B1 (fr)
JP (1) JP2721191B2 (fr)
AT (1) ATE70749T1 (fr)
DE (3) DE3728918A1 (fr)
ES (1) ES2029299T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990004472A1 (fr) * 1988-10-24 1990-05-03 Hüttenes-Albertus Chemische Werke GmbH Procede pour fabriquer des pieces moulees en fonte avec une isolation a haute temperature refondue, au moins approximativement etanche aux gaz
EP0506123A1 (fr) * 1991-03-29 1992-09-30 Asahi Tec Corporation Méthode de préparation d'un modèle perdu
FR2676015A1 (fr) * 1991-05-01 1992-11-06 Outboard Marine Corp Procede et appareil pour la fabrication d'un boitier comportant un insert coule in situ par coulage a mousse perdue.
FR2698296A1 (fr) * 1992-11-23 1994-05-27 Peugeot 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.
EP3763503A1 (fr) * 2019-07-08 2021-01-13 PSA Automobiles SA Moule d'injection de polystyrene expanse pour la realisation d'un element creux

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4230970C1 (de) * 1992-09-16 1994-07-21 Nolte Markus Dipl Ing Dipl Wir Verfahren zur Herstellung von Feingussteilen
DE19612781C1 (de) * 1996-03-29 1997-08-21 Karmann Gmbh W Bauteil aus metallischem Schaumwerkstoff, Verfahren zum Endformen dieses Bauteils und Vorrichtung zur Ausführung des Verfahrens
KR100814794B1 (ko) * 2006-10-09 2008-03-19 (주)동양특수주강 집진덕트용 곡관부의 이중 내마모층 형성방법 및 이를 통해제조된 이중 내마모층이 형성된 집진덕트용 곡관부
CN112846150B (zh) * 2020-12-30 2023-02-28 中钢集团邢台机械轧辊有限公司 一种热轧型钢孔型轧辊多元复合制造方法

Citations (1)

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Publication number Priority date Publication date Assignee Title
WO1979000298A1 (fr) * 1977-11-17 1979-05-31 Caterpillar Tractor Co Collecteur isole a deux parois coulees et procede de fabrication

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DE1144882B (de) * 1960-11-22 1963-03-07 Gruenzweig & Hartmann A G Verfahren zur Herstellung von Gussstuecken unter Verwendung vergasbarer Modelle
DE1181373B (de) * 1962-01-20 1964-11-12 Gruenzweig & Hartmann Giessverfahren und Verfahren zum Herstellen von Kernen unter Verwendung vergasbarer Modelle
DE1508655C3 (de) * 1965-10-16 1974-08-29 Gruenzweig + Hartmann Und Glasfaser Ag, 6700 Ludwigshafen Anorganischer Überzug für ein vergasbares Gießmodell und dessen Anwendung
US3723584A (en) * 1969-12-15 1973-03-27 Bischoff Chemical Corp Method of making an electroformed mold having heat transfer conduits and foam polyurethane foundation
JPS5248602B2 (fr) * 1973-03-06 1977-12-10
US4148352A (en) * 1975-08-15 1979-04-10 Nissan Motor Company, Limited Method of preparing an exhaust port arrangement of a cylinder head
JPS5239010A (en) * 1975-09-22 1977-03-26 Nissan Motor Co Ltd Exhaust port device for internal combustion engine
DE2758993A1 (de) * 1977-12-30 1979-07-05 Eduard Dr Ing Baur Verfahren zum herstellen von durch unterdruck stabilisierten hohlen giessformen aus rieselfaehiger binderfreier hinterfuellmasse
US4220190A (en) * 1978-11-02 1980-09-02 Precision Metalsmiths, Inc. Method of making tooling
JPS60171945U (ja) * 1984-04-24 1985-11-14 日本特殊陶業株式会社 断熱ポ−トライナ−
US4693293A (en) * 1985-07-25 1987-09-15 Toshiba Kikai Kabushiki Kaisha Method of casting a machine part by fusing metal layers on both sides of a separting plate
JPS62151242A (ja) * 1985-12-26 1987-07-06 Sekisui Plastics Co Ltd 中子付消失型による鋳造方法
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JPS63133853U (fr) * 1987-02-25 1988-09-01
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WO1979000298A1 (fr) * 1977-11-17 1979-05-31 Caterpillar Tractor Co Collecteur isole a deux parois coulees et procede de fabrication

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PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 138 (M-480)[2195], 21. Mai 1986; & JP-A-60 261 657 (KOMATSU SEISAKUSHO K.K.) 24-12-1985 *
PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 380 (M-650)[2827], 11. Dezember 1987; & JP-A-60 151 242 (SEKISUI PLASTICS CO. LTD) 06-07-1987 *
PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 10 (M-658)[2857], 13. Januar 1988; & JP-A-62 173 053 (M C L K.K.) 29-07-1987 *
PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 89 (M-207)[1234], 13. April 1983; & JP-A-58 13 464 (TAKAOKA KOGYO K.K.) 25-01-1983 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990004472A1 (fr) * 1988-10-24 1990-05-03 Hüttenes-Albertus Chemische Werke GmbH Procede pour fabriquer des pieces moulees en fonte avec une isolation a haute temperature refondue, au moins approximativement etanche aux gaz
EP0506123A1 (fr) * 1991-03-29 1992-09-30 Asahi Tec Corporation Méthode de préparation d'un modèle perdu
US5360050A (en) * 1991-03-29 1994-11-01 Asahi Tec Corporation Method of preparing disappearing model
EP1029615A1 (fr) * 1991-03-29 2000-08-23 Asahi Tec Corporation Procédé de fabrication d'un modèle perdu
FR2676015A1 (fr) * 1991-05-01 1992-11-06 Outboard Marine Corp Procede et appareil pour la fabrication d'un boitier comportant un insert coule in situ par coulage a mousse perdue.
FR2698296A1 (fr) * 1992-11-23 1994-05-27 Peugeot 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.
EP0599680A1 (fr) * 1992-11-23 1994-06-01 Automobiles Peugeot 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
EP3763503A1 (fr) * 2019-07-08 2021-01-13 PSA Automobiles SA Moule d'injection de polystyrene expanse pour la realisation d'un element creux
FR3098436A1 (fr) * 2019-07-08 2021-01-15 Psa Automobiles Sa Moule d’injection de polystyrene expanse pour la realisation d’un element creux

Also Published As

Publication number Publication date
ATE70749T1 (de) 1992-01-15
ES2029299T3 (es) 1992-08-01
DE3728918A1 (de) 1989-03-09
DE3867178D1 (de) 1992-02-06
DE8717657U1 (de) 1989-09-21
JP2721191B2 (ja) 1998-03-04
US4942915A (en) 1990-07-24
JPS6471548A (en) 1989-03-16
EP0305653B1 (fr) 1991-12-27

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