EP0019015A1 - Noyau de fonderie pour la préparation de cavités difficilement accessibles dans des pièces de fonte et procédé pour sa fabrication - Google Patents

Noyau de fonderie pour la préparation de cavités difficilement accessibles dans des pièces de fonte et procédé pour sa fabrication Download PDF

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Publication number
EP0019015A1
EP0019015A1 EP79105250A EP79105250A EP0019015A1 EP 0019015 A1 EP0019015 A1 EP 0019015A1 EP 79105250 A EP79105250 A EP 79105250A EP 79105250 A EP79105250 A EP 79105250A EP 0019015 A1 EP0019015 A1 EP 0019015A1
Authority
EP
European Patent Office
Prior art keywords
sugar
casting core
binder
basic substance
casting
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
EP79105250A
Other languages
German (de)
English (en)
Other versions
EP0019015B1 (fr
Inventor
Wolfram Dipl.-Ing. Wischnack
Alfred Dobner
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.)
Alcan Aluminiumwerk Nuernberg GmbH
Novelis Deutschland GmbH
Original Assignee
Alcan Aluminiumwerk Nuernberg GmbH
Alcan Aluminiumwerke 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 Alcan Aluminiumwerk Nuernberg GmbH, Alcan Aluminiumwerke GmbH filed Critical Alcan Aluminiumwerk Nuernberg GmbH
Publication of EP0019015A1 publication Critical patent/EP0019015A1/fr
Application granted granted Critical
Publication of EP0019015B1 publication Critical patent/EP0019015B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
    • B22C1/26—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of carbohydrates; of distillation residues therefrom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/105—Salt cores

Definitions

  • the invention relates to casting cores for producing cavities which are difficult to access in castings made of aluminum or one of its alloys, from a basic substance and a hardened organic binder, and to processes for producing such casting cores.
  • the synthetic F resin or synthetic resin of DE-OS 17 83 004 are those of the urea-formaldehyde type, phenol-formaldehyde type, melamine-formaldehyde type, urea furfuryl type, phenol furfuryl type or of the sugar or Glycose-based type or compatible compositions of such resins.
  • K resin-bound salt cores have the disadvantage that when used under the influence of the casting temperature, large amounts of gas can be released from the binder. To avoid porosity in the casting, these gases must be removed quickly and completely. Due to the mostly narrow cross sections, which are given by the geometry of the cast parts, blockages can easily occur in the outflow channels due to the condensation of resinous products. The result is an uncontrolled escape of the gases from the entire core surface with the known disadvantageous consequences for the casting.
  • the invention is therefore based on the object of creating casting cores and processes for their production, from which, under the action of the temperatures when casting light metal, in particular aluminum and its alloys, only Small amounts of gas, if any, are released, the type of reaction products should be such that gas can also be removed through thin channels without condensation products leading to blockages in these channels.
  • the core material should be easy to remove from the cavity from possibly very narrow openings, either by dissolving the base substance or by disintegrating the binder, in which the base substance becomes free-flowing again.
  • This object is achieved by creating a casting core of the type mentioned at the outset, which is characterized in that the binder used to bind the base substance is sugar or a sugar derivative.
  • the disadvantages mentioned above can be avoided by using sugar or natural sugar derivatives as binders. It is particularly advantageous here that the casting cores according to the invention release only very small amounts of combustion gases from the binder at the casting temperatures, it not forming pasty condensates through which the outflow channels could be restricted or blocked.
  • the binder used according to the invention is particularly advantageously sugar color.
  • Sugar color which is also called caramel
  • caramel is usually a more or less dark-colored mass which is produced when cane sugar, beet sugar or glucose - to a certain extent with the addition of a little alkali - to higher temperatures heated.
  • the (monomolecular) starting sugar as add such the basic substance and in the course of creation of the core H caramel to produce or already from the beginning, the basic substance having already panoramicen- the caramel to be provided.
  • the selected base substance which is bound with sugar (couleur) or a natural sugar derivative, is in granular form.
  • sugar couleur
  • a natural sugar derivative is in granular form.
  • Such a configuration generally facilitates the dissolution or removal of the basic substance.
  • a water-soluble salt, sands, e.g. quartz sand, metal granules, alone or in a mixture, are used as the basic substance. Particularly favorable results are obtained for some applications when water-soluble salt is combined with sugar color.
  • the amount of binder used can vary widely depending on the type of basic substance to be bound. Usually, the proportion of the binder, based on the total weight of the casting core, about 0.3 1 5 wt.%.
  • metal tubes are inserted into the cores bound with sugar or a sugar derivative, in particular based on salt, during their manufacture, e.g. by pressing that they can later be used both for fastening the cores in the casting mold and for removing the reaction gases during the casting process.
  • the tubes used in this way can be flanged in the manner of hollow rivets, slotted on the side or perforated, on the one hand in order to ensure a firm fit in the core material and on the other hand in order to easily remove the gases.
  • tubes e.g. Made of metal, which are designed such that they offer the possibility of connection to a suction line outside the mold.
  • the casting cores are produced in accordance with a method according to the invention in such a way that the selected basic substance is mixed with sugar or a derivative thereof in aqueous, organic or mixed aqueous-organic solution, pressed into molds and baked at elevated temperature.
  • the proportion of the solvent used can vary within wide limits, particularly favorable results have been obtained with a weight ratio of solvent to organic binder of about 1: 1 to 1:10.
  • the base substance is kept at a slightly higher temperature than the room temperature when it is coated with the binder.
  • the basic substance in the coating with the binder can have a temperature between 20 and 180 ° C., the mixing process required for the coating then being continued until a dry, free-flowing mixture has formed.
  • the subsequent pressing process can also take place at elevated temperatures, which can be set depending on the type of sugar or sugar derivative selected. Press temperatures in the range between 50 and 200 ° C. are preferred.
  • the baking that usually follows the pressing is also carried out at an elevated temperature. Temperatures between 150 and 300 ° C have proven to be favorable.
  • the time required for the baking depends on the type of sugar selected and the baking temperature, and it can usually comprise periods of about 10 minutes to about 2 hours for the baking temperatures indicated above.
  • drying or removal of the solvent can be accelerated or promoted by increasing the temperature by introducing warm dry air.
  • the casting cores according to the invention are illustrated schematically in a preferred embodiment in the attached figure.
  • a cooling channel ring core 1 which is used to produce a cooling channel in the piston of an internal combustion engine, is shown in the casting core.
  • the molded tubes 2 are used for fastening in the core receptacles 3 of the casting mold and at the same time for gas discharge.
  • the casting cores according to the invention have particular advantages. This allows the cores to be washed out of the finished castings without any effort, for example by adding water.
  • a further advantage of the casting cores according to the invention, but also of the process for their production, is that neither in the production of the cores nor during the casting process or during subsequent washing out of the core residues from the casting do gases or vapors or waste materials arise or be released which are present in any one would be environmentally harmful. Apart from this, as already stated above, the amount of gas released is relatively small.
  • the binder based on sugar or a derivative thereof has excellent disintegration properties, since its binding power is largely destroyed when the casting is poured. Therefore, not only water-soluble base substance, e.g. Salts are used, but also other non-soluble base substance, such as sand, metal granules in granular or "mobile” form.
  • the basic substance which is largely in the form of a pour after the casting has cooled, can then be easily removed from the resulting cavity by simply shaking it out or by rinsing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP79105250A 1979-04-27 1979-12-18 Noyau de fonderie pour la préparation de cavités difficilement accessibles dans des pièces de fonte et procédé pour sa fabrication Expired EP0019015B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2917208 1979-04-27
DE19792917208 DE2917208A1 (de) 1979-04-27 1979-04-27 Giesskern zur erzeugung schwer zugaenglicher hohlraeume in gusstuecken, sowie verfahren zu dessen herstellung

Publications (2)

Publication Number Publication Date
EP0019015A1 true EP0019015A1 (fr) 1980-11-26
EP0019015B1 EP0019015B1 (fr) 1983-04-27

Family

ID=6069469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79105250A Expired EP0019015B1 (fr) 1979-04-27 1979-12-18 Noyau de fonderie pour la préparation de cavités difficilement accessibles dans des pièces de fonte et procédé pour sa fabrication

Country Status (8)

Country Link
US (1) US4361181A (fr)
EP (1) EP0019015B1 (fr)
JP (1) JPS55144352A (fr)
BR (1) BR8000487A (fr)
CA (1) CA1158014A (fr)
DE (1) DE2917208A1 (fr)
ES (2) ES488019A0 (fr)
PT (1) PT70731A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132581A1 (fr) * 1983-06-27 1985-02-13 Toyota Jidosha Kabushiki Kaisha Procédé pour le formage d'une matière composite à base métallique
WO2004082866A3 (fr) * 2003-03-21 2004-12-16 Emil Mueller Gmbh Noyaux de sels hydrosolubles et procede de production desdits noyaux
WO2008003517A1 (fr) 2006-07-07 2008-01-10 Emil Müller GmbH Noyau de sel soluble dans l'eau avec élément fonctionnel
WO2008003518A1 (fr) 2006-07-07 2008-01-10 Emil Müller GmbH Noyaux de sel pour le moulage (par injection) de matières plastiques

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3530924A1 (de) * 1985-08-29 1987-03-12 Alcan Aluminiumwerke Hitzebestaendiges bauteil und verfahren zu dessen herstellung
DE3831285A1 (de) * 1987-09-17 1989-04-06 Aisin Seiki Verfahren zur herstellung eines kolbens einer brennkraftmaschine
US4925492A (en) * 1987-09-21 1990-05-15 The Interlake Corporation Ceramic core for investment casting and method for preparation
DE3903310C2 (de) * 1989-02-04 1992-10-22 Mahle Gmbh Verfahren zur herstellung eines mit einem porösen nachtraeglich auslösbaren einlageteil zu versehenden formgussteiles aus insbesondere aluminium.
JPH074646B2 (ja) * 1989-02-20 1995-01-25 リョービ株式会社 高圧鋳造用砂中子及びその製造方法
JPH02220733A (ja) * 1989-02-22 1990-09-03 Aisin Seiki Co Ltd 内燃機関用ピストンの製造方法
US6557621B1 (en) 2000-01-10 2003-05-06 Allison Advanced Development Comapny Casting core and method of casting a gas turbine engine component
US6478073B1 (en) 2001-04-12 2002-11-12 Brunswick Corporation Composite core for casting metallic objects
WO2005028142A1 (fr) * 2003-09-17 2005-03-31 Yamaha Hatsudoki Kabushiki Kaisha Poinçon de coulage
US7406941B2 (en) * 2004-07-21 2008-08-05 Federal - Mogul World Wide, Inc. One piece cast steel monobloc piston
US7013948B1 (en) 2004-12-01 2006-03-21 Brunswick Corporation Disintegrative core for use in die casting of metallic components
CN101861219A (zh) * 2007-11-14 2010-10-13 北爱荷华大学研究基金会 生物基粘合剂系统
US8426494B2 (en) * 2009-10-06 2013-04-23 Amcol International Corp. Lignite urethane based resins for enhanced foundry sand performance
JP6565011B2 (ja) * 2015-05-29 2019-08-28 リグナイト株式会社 鋳型の製造方法
DE112018000221B4 (de) 2017-01-25 2023-02-16 Technische Universität Bergakademie Freiberg Verfahren zur Herstellung von hochtemperaturfesten Erzeugnissen mit verbesserten thermomechanischen Eigenschaften und hochtemperaturfestes Erzeugnis
JP2021098212A (ja) * 2019-12-23 2021-07-01 トヨタ自動車株式会社 塩中子の製造方法
US11724306B1 (en) 2020-06-26 2023-08-15 Triad National Security, Llc Coating composition embodiments for use in investment casting methods

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1945342A1 (de) * 1968-09-04 1970-03-19 Int Minerals & Chem Corp Massen aus Ton und wasserloeslichen Pfropfmischpolymerisaten
DE1937964A1 (de) * 1968-07-26 1970-08-06 British Non Ferrous Metals Res Kernsandbinder
US3645491A (en) * 1969-07-22 1972-02-29 Aeroplane Motor Aluminum Casti Soluble metal casting cores comprising a water-soluble salt and a synthetic resin
DE2111615A1 (de) * 1971-03-11 1972-09-14 Tasic Zivko Dipl Chem Giessereiformsand
DE2250568A1 (de) * 1972-10-14 1974-04-18 Porsche Ag Gussform
DE2434234A1 (de) * 1973-07-16 1975-02-06 Cpc International Inc Massen zur herstellung von giessformen und -kernen nach dem zementverfahren
DE2715039A1 (de) * 1976-04-08 1977-10-20 Hirofumi Matsui Gruensandmassen zum giessen
DE2746122A1 (de) * 1977-10-13 1979-04-19 Alcan Aluminiumwerke Kernmaterial fuer giesskerne

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA787804A (en) * 1968-06-18 Starr Clive Foundry moulding sand compositions
US2926098A (en) * 1955-10-14 1960-02-23 Diamond Alkali Co Binder for foundry molds

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1937964A1 (de) * 1968-07-26 1970-08-06 British Non Ferrous Metals Res Kernsandbinder
DE1945342A1 (de) * 1968-09-04 1970-03-19 Int Minerals & Chem Corp Massen aus Ton und wasserloeslichen Pfropfmischpolymerisaten
US3645491A (en) * 1969-07-22 1972-02-29 Aeroplane Motor Aluminum Casti Soluble metal casting cores comprising a water-soluble salt and a synthetic resin
DE2111615A1 (de) * 1971-03-11 1972-09-14 Tasic Zivko Dipl Chem Giessereiformsand
DE2250568A1 (de) * 1972-10-14 1974-04-18 Porsche Ag Gussform
DE2434234A1 (de) * 1973-07-16 1975-02-06 Cpc International Inc Massen zur herstellung von giessformen und -kernen nach dem zementverfahren
DE2715039A1 (de) * 1976-04-08 1977-10-20 Hirofumi Matsui Gruensandmassen zum giessen
DE2746122A1 (de) * 1977-10-13 1979-04-19 Alcan Aluminiumwerke Kernmaterial fuer giesskerne

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132581A1 (fr) * 1983-06-27 1985-02-13 Toyota Jidosha Kabushiki Kaisha Procédé pour le formage d'une matière composite à base métallique
WO2004082866A3 (fr) * 2003-03-21 2004-12-16 Emil Mueller Gmbh Noyaux de sels hydrosolubles et procede de production desdits noyaux
WO2008003517A1 (fr) 2006-07-07 2008-01-10 Emil Müller GmbH Noyau de sel soluble dans l'eau avec élément fonctionnel
WO2008003518A1 (fr) 2006-07-07 2008-01-10 Emil Müller GmbH Noyaux de sel pour le moulage (par injection) de matières plastiques
DE102006031532B3 (de) * 2006-07-07 2008-04-17 Emil Müller GmbH Wasserlöslicher Salzkern mit Funktionsbauteil

Also Published As

Publication number Publication date
DE2917208A1 (de) 1980-12-04
CA1158014A (fr) 1983-12-06
JPS55144352A (en) 1980-11-11
ES495002A0 (es) 1981-06-16
ES8105595A1 (es) 1981-06-16
BR8000487A (pt) 1980-12-30
ES8104929A1 (es) 1981-05-16
ES488019A0 (es) 1981-05-16
EP0019015B1 (fr) 1983-04-27
US4361181A (en) 1982-11-30
PT70731A (en) 1980-02-01

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