EP0017902B1 - Procédé de fabrication d'un moule réfractaire de fonderie - Google Patents

Procédé de fabrication d'un moule réfractaire de fonderie Download PDF

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Publication number
EP0017902B1
EP0017902B1 EP19800101883 EP80101883A EP0017902B1 EP 0017902 B1 EP0017902 B1 EP 0017902B1 EP 19800101883 EP19800101883 EP 19800101883 EP 80101883 A EP80101883 A EP 80101883A EP 0017902 B1 EP0017902 B1 EP 0017902B1
Authority
EP
European Patent Office
Prior art keywords
shell
pattern
sand
model
quartz sand
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
Application number
EP19800101883
Other languages
German (de)
English (en)
Other versions
EP0017902A1 (fr
Inventor
Christian Schönenborn
Ulrich Dr. Dipl.-Chem. Mennenga
H. Prof. Dipl.-Ing. Jaeger
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.)
Kloeckner Humboldt Deutz AG
Huettenes Albertus Chemische Werke GmbH
Original Assignee
Kloeckner Humboldt Deutz AG
Huettenes Albertus Chemische Werke GmbH
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 Kloeckner Humboldt Deutz AG, Huettenes Albertus Chemische Werke GmbH filed Critical Kloeckner Humboldt Deutz AG
Publication of EP0017902A1 publication Critical patent/EP0017902A1/fr
Application granted granted Critical
Publication of EP0017902B1 publication Critical patent/EP0017902B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • 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

Definitions

  • the invention relates to a method for producing a refractory foundry mold, in which a free-flowing quartz sand, quartz material or a similar refractory mineral substance, the grains of which are encased by an organic substance or by an inorganic substance, by the action of a pressure difference between model and sand or if necessary, molded onto the model between the core box and sand and compacted into a shell on the surface thereof, in which the shell is backfilled with conventional molding material, for example a wet casting molding sand, and this is compacted and in which the model is subsequently removed from the foundry mold.
  • a free-flowing quartz sand, quartz material or a similar refractory mineral substance the grains of which are encased by an organic substance or by an inorganic substance
  • AT-A-370 075 discloses a method of the type mentioned, in which a shell is produced on a model by sucking air through it from a layer of molding sand applied to the model, the binder contained in the molding sand hardening by evaporation of a component of the solution. A backfilling of the shell made of binder-free molding sand is compressed after a film has been placed on the molding sand surface by sucking air out of the molding box.
  • the object on which the invention is based is to provide a method in which the difficulties described above are avoided and in which, while maintaining optimum dimensional accuracy and dimensional accuracy and improved curing of the molding material in the area of the model, foundry molds with a uniformly constructed molded shell and a stable one Backfill can be shown.
  • the solution to this lies in a method in which the covering of the quartz sand or the like consists of a thermosetting material, the model is heated to the appropriate hardening temperature when the formwork is sheathed, and after the shells have been formed, the quartz sand or the like which is not hardened to form the sheathing or the like the back of the shell is removed.
  • thermosetting coating of the quartz sand according to the invention which e.g. can consist of a synthetic resin, whereby, for example, a water glass solution can be mixed into the molding sand, forms a hardened shell of uniform wall thickness under the influence of the model surface brought to the curing temperature of the covering, the height of the total poured molding sand layer being irrelevant.
  • the shell of uniform wall thickness is then prepared for the application of the self-supporting backfill.
  • This consists of a conventional molding material that is compressed only mechanically or with the support of pressure differences, the shell being supported in accordance with the invention in a favorable manner on the model and can therefore be subjected to high forces.
  • a negative pressure can be maintained in the area of the model.
  • the resulting solidified form is self-supporting and can, if necessary, be removed from the core box or molding box before joining two mold halves. This significantly simplifies handling.
  • the excess quartz sand can be removed in any way. This is advantageously done by tilting the mold or core box by 180 °. The vacuum between the model and the shell can also be maintained to hold the shape.
  • An essential advance of the invention is that air is sucked out of the molded product from the model during the entire process up to the separation of the foundry mold, and thus annoying and endangering the working personnel by gases and vapors forming during the hardening process is prevented.
  • 1 denotes a foundry model, which is preferably provided in the transition area from the model to the flat plate with suction openings 2, which are only indicated in the simplified illustration.
  • the model 1 is arranged on a heated plate 3, on the back of which there is a space 4 which is connected to the suction openings 2.
  • a molding box 5 is placed on the device, which is filled with a free-flowing quartz sand, quartz material or similar refractory mineral material 6.
  • the plate 3 is heated.
  • a pressure difference between the surface of the model 1 and the free-flowing quartz sand 6 is generated by creating a negative pressure in the space 4, while atmospheric pressure prevails on the surface of the quartz sand.
  • the negative pressure in the space 4 can also be increased by an excess pressure on the surface of the quartz sand 6.
  • This hard shell 7 is, as further shown in FIG. 4, backfilled with a conventional molding material 8, for example wet casting molding sand, this backfilling 8 in turn being compressed under the action of a differential pressure between the surface of the model 1 and the backfilling 8.
  • This pressure differential compression of the backfill can also be supplemented by mechanical compression, not shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Casting Devices For Molds (AREA)

Claims (4)

1. Procédé pour la réalisation d'un moule réfractaire de fonderie pour lequel du sable de quartz, fluide, du quartz ou un matériau minéral réfractaire, analogue, dont les grains sont entourés d'une matière organique ou d'une matière inorganique, sont appliqués contre le modèle sous l'effet d'une différence de pression entre le modèle et le sable ou entre la boîte à noyau et le sable pour être compactés en une coquille à la surface du modèle et en ce que la coquille est remplie par un matériau de moulage habituel, par exemple du sable de moule de fonderie humide, et est compactée, puis on enlève le modèle du moule de fonderie, procédé caractérisé en ce que l'enrobage du sable de quartz (6) ou analogue, est en un matériau thermodurcissable, en ce que le modèle (1) est réchauffé à la température de dur- cissage, correspondante, lors du coffrage et en ce qu'après la formation de la coquille, le sable de quartz (6) ou analogue, d'enrobage, non durci pour former la coquille (7), est enlevé du côté arrière de la coquille (7).
2. Procédé selon la revendication 1, caractérisé en ce que l'enlèvement du sable de quartz (6) ou analogue, d'enrobage, non durci pour former une coquille (7), se fait par basculement du modèle (1), le cas échéant, avec la boîte de moulage ou la boîte à noyau (5), d'environ 180° et au niveau du modèle (1), on maintient une dépressiorf.
3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la séparation du modèle (1) par rapport à la coquille (7) se fait en créant une surpression entre le modèle (1) et la coquille (7).
4. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'air, aspiré au niveau du modèle 1 et qui crée la dépression, est nettoyé des gaz toxiques et/ou atoxiques ou analogues.
EP19800101883 1979-04-21 1980-04-09 Procédé de fabrication d'un moule réfractaire de fonderie Expired EP0017902B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792916211 DE2916211C2 (de) 1979-04-21 1979-04-21 Verfahren zur Herstellung einer Gießereiform
DE2916211 1979-04-21

Publications (2)

Publication Number Publication Date
EP0017902A1 EP0017902A1 (fr) 1980-10-29
EP0017902B1 true EP0017902B1 (fr) 1983-05-18

Family

ID=6068934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800101883 Expired EP0017902B1 (fr) 1979-04-21 1980-04-09 Procédé de fabrication d'un moule réfractaire de fonderie

Country Status (3)

Country Link
EP (1) EP0017902B1 (fr)
JP (1) JPS55141354A (fr)
DE (1) DE2916211C2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2923044C2 (de) * 1979-06-07 1987-05-27 Eugen Dipl.-Ing. 8877 Burtenbach Bühler Verfahren und Vorrichtung zur Herstellung von geteilten Komposit-Sandblock-Gießformen
GB2116889B (en) * 1982-03-23 1985-11-13 Acme Conveyors & Constr A process of moulding a metal casting mould
DE3318112A1 (de) * 1983-05-18 1984-11-22 Achinger, Michael, 8900 Augsburg Verfahren und vorrichtung zum herstellen von giessformen
FR2724336B1 (fr) * 1994-09-14 1996-10-31 Chardon Michel Georges Procede de moulage en sable siliceux alliant l'utilisation de sable a prise chimique et de sable sans liant sous depression
CN104325075A (zh) * 2014-10-08 2015-02-04 柳州金茂机械有限公司 一种v法铸造工艺
CN105562623B (zh) * 2015-12-31 2017-10-24 华中科技大学 一种水玻璃砂型快速成形方法
CN113400649B (zh) * 2021-06-30 2023-07-04 山东威高骨科材料股份有限公司 一种解决3d打印peek材料零件热变形的方法

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE945717C (de) * 1943-11-14 1956-07-12 Siemens Ag Verfahren zur Herstellung von Giessformen fuer Metallguss, Eisenguss od. dgl.
DE1097621B (de) * 1956-03-23 1961-01-19 Fritz Hansberg Verfahren und Formmaschine zur pneumatischen Herstellung von Giessereikernen und Giessereiformen sowie Kasten hierfuer
DE1129660B (de) * 1956-04-20 1962-05-17 Gen Motors Corp Verfahren und Vorrichtung zum Hinterfuellen von Formmasken beim Giessen
DE1167488B (de) * 1959-06-17 1964-04-09 Shell Moulding Foundry Ltd Verfahren zur Herstellung von Giessformen
US3293703A (en) * 1962-11-13 1966-12-27 Arthur R Taccone Vacuum molding apparatus
GB1151237A (en) * 1966-07-20 1969-05-07 Barnett Levy Method for Removing Sand Cores and Pattern Shells from Core Boxes and Patterns
BE789785A (fr) * 1971-10-08 1973-02-01 Akita Kk Appareil de production de moule
JPS5519958B2 (fr) * 1972-08-15 1980-05-29
JPS5532459B2 (fr) * 1973-12-21 1980-08-25
JPS5138230A (en) * 1974-09-30 1976-03-30 Mitsubishi Heavy Ind Ltd Igatano genatsuzokeihoho
JPS5160629A (en) * 1974-11-22 1976-05-26 Mitsubishi Heavy Ind Ltd Genatsuzokeiigatano seisakuhoho
AT340075B (de) * 1975-04-21 1977-11-25 Mitsubishi Heavy Ind Ltd Verfahren zum herstellen einer gussform
DE2619529A1 (de) * 1975-05-01 1976-11-18 Baker Perkins Holdings Ltd Verfahren und vorrichtung zum fuellen von giessereiformen oder kernkaesten mit einer formmischung auf sandbasis
DE2608740C2 (de) * 1976-03-03 1978-05-11 Eugen Dipl.-Ing. 8871 Burtenbach Buehler Verfahren zum Verdichten von Formsand
DE2609274A1 (de) * 1976-03-05 1977-09-08 Buehler Eugen Verfahren zur pneumatischen sandverdichtung bei der herstellung von sandformen oder -kernen
DE2833999C2 (de) * 1978-08-03 1981-11-19 Eugen Dipl.-Ing. 8871 Burtenbach Bühler Verfahren und Vorrichtung zur Herstellung von Gießformen und -kernen
DE2844464C2 (de) * 1978-10-12 1983-03-24 Bühler, Eugen, Dipl.-Ing., 8871 Burtenbach Verfahren und Vorrichtung zum Verdichten von Gießformen

Also Published As

Publication number Publication date
EP0017902A1 (fr) 1980-10-29
JPS55141354A (en) 1980-11-05
JPS6321576B2 (fr) 1988-05-07
DE2916211C2 (de) 1983-11-24
DE2916211A1 (de) 1980-10-30

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