EP1850986A2 - Utilisation de sels peu solubles combines a du verre soluble pour fabriquer des moules et des noyaux pour des applications en fonderie - Google Patents

Utilisation de sels peu solubles combines a du verre soluble pour fabriquer des moules et des noyaux pour des applications en fonderie

Info

Publication number
EP1850986A2
EP1850986A2 EP05809208A EP05809208A EP1850986A2 EP 1850986 A2 EP1850986 A2 EP 1850986A2 EP 05809208 A EP05809208 A EP 05809208A EP 05809208 A EP05809208 A EP 05809208A EP 1850986 A2 EP1850986 A2 EP 1850986A2
Authority
EP
European Patent Office
Prior art keywords
component
use according
cores
mixture
green
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Withdrawn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
EP05809208A
Other languages
German (de)
English (en)
Inventor
Bernd Kuhs
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.)
Laempe Moessner Sinto GmbH
Original Assignee
LAEMPE AND MOSSNER 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 LAEMPE AND MOSSNER GmbH filed Critical LAEMPE AND MOSSNER GmbH
Publication of EP1850986A2 publication Critical patent/EP1850986A2/fr
Withdrawn legal-status Critical Current

Links

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
    • B22C1/18—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 inorganic agents
    • B22C1/186—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 inorganic agents contaming ammonium or metal silicates, silica sols
    • B22C1/188—Alkali metal silicates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00939—Uses not provided for elsewhere in C04B2111/00 for the fabrication of moulds or cores

Definitions

  • the invention relates to the use of waterglass and / or precursors thereof in the production of castable molds and / or cores for foundry purposes, to methods of making corresponding molds and / or cores, and to corresponding molds and cores, and to other inventive embodiments described below.
  • Silica and alkali metal bases such as ammonium, sodium and / or potassium bases, such as the corresponding hydroxides, are known as binding materials, for example in the construction industry.
  • water glass can be cured in combination with carbon dioxide, which is not particularly good
  • Curing leads, for example, because the reaction takes place only superficially (see O. Henning and D. Knöfel,
  • the object is to provide new compositions for molds and / or cores which can be used in the foundry, which have a sufficient hardness for the casting process and are still easily removable after the casting process and without residues on the foundry products.
  • this object can be achieved by the use of water glass, and / or one or more precursors thereof, in the production of molds and / or cores for foundry purposes, wherein (or by in that said use comprises that as component (1) water glass and / or one or more precursors thereof, and as component (2) one or more sparingly soluble metal salts, in particular those metals which can form silicates, and / or mixtures of component (1) and (2), for the production of castable molds and / or cores for foundry purposes, to be mixed with non-melting ("refractory") particulate materials as component (3) during the casting process.
  • refractory non-melting
  • a further advantage of the forms and / or cores which can be produced according to the invention is that the composition used can be excellently compatible with various agents for increasing the flowability in the molds and / or cores. Finally, it is possible to effectively avoid gas formation, especially with a smaller proportion of water in the glass of water and / or a smaller proportion of the water glass in the overall composition of the molds and / or cores.
  • the molds and / or cores available during the casting process can be removed without the addition of water. It is also advantageous that after removal of the cores (conversion into a free-flowing form) separation of the particulate material, e.g. Sand, can be reached from the remaining material residues, for example, by simple sifting.
  • Waterglass a mixture of ammonium or alkali metal (such as sodium and / or potassium silicates, favoring less gas evolution), may be used as component (1) in dried form (which would fall under the definition of water glass precursors) or directly as aqueous Solution can be used.
  • a dried Form the addition of water before adding additional components or after the addition of one or more of the components.
  • silicon dioxide for example amorphous silica or microsilica
  • one or more alkali metal bases in particular one or more alkali metal (such as sodium or potassium) hydroxides
  • directly one or more of the other components ( 2), (3) and optionally further additives are added, so that the water glass is formed only in admixture with one or more of these further components. All combinations of these mixture variants are conceivable and encompassed by the present invention.
  • the molar water glass module can be used to influence the properties of the available shapes and / or cores.
  • the one or more metal salts used as component 2 are preferably a by itself or by Coatmg, for example, with organic polymers of a suitable melting point, for example having a melting point in the range of used in the production of green forms and / or cores temperatures, eg from at least 100 0 C.
  • the (preferably uncoated) hydroxides and / or fluorides are particularly Partly, as well as magnesium oxide (particularly advantageous in the cast iron foundry, preferably used as sintered magnesium, also, if mentioned below), since they do not lead to the formation of gases during casting or the production of molds and / or cores, as for example (otherwise also usable) sparingly soluble salts of organic acids, such as hydroxycarboxylic acids, for example lactates, or the like may be the case.
  • the said sparingly soluble salts are preferably chosen so that they are so sparingly soluble that they can not react at room temperature (either because of a coating or preferably on their own) or not to a disturbing extent with the water glass.
  • hydroxides of alkali metals such as sodium hydroxide, may be added, for example (based on one part by weight of sparingly soluble metal salts as 1 part by weight) in a proportion by weight of 0.05 to 1, preferably 0.1 to 0.3, additional parts by weight ,
  • Component (1) and component (2) may be added separately to the mixture, or they may be pre-determined (with or without water content in water glass, ie as dry mix (obtainable eg by spray-drying), for example as dry powder, or with the water content, which is also longer Time, for example, several weeks, gives stable compositions which can also be used for adding the two components) and thus added to the other component (s).
  • dry mix obtainable eg by spray-drying
  • water content which is also longer Time, for example, several weeks, gives stable compositions which can also be used for adding the two components
  • Such mixtures of component (1) and (2) as such (binder mixtures) are also a preferred embodiment of the invention.
  • the proportions of component (1) and component (2) are matched to one another, in particular in such a way that a coordinated ratio of cation of the sparingly soluble metal salt to anion in the water glass (silicates, in particular polymethyl and Polydisilikate etc.) becomes.
  • the weight ratio of component (2) to the dry matter proportions in component (1) is in the ratio of 1: 4 to 3: 1, for example in a possible preferred one Embodiment in the weight ratios of the two said components (2) to (1) at 0.6 to 2 to 1, 4 to 0.6, so at about 1 to 1 to 2.
  • component 1 in aqueous form before is - Example of a preferred weight ratio of component (1) with water to the weight of component (2) at 5 to 1 to 1 to 2, for example at 3 to 1 to 1, 5 to 1.
  • the proportion of the components (1) and (2) in the mixture for molds and / or cores may in principle be arbitrary. Thus, based on the weight of component (3), it may be present in a proportion by weight of from 0.1 to 6% by weight, or, for example, in another possible preferred embodiment in a proportion by weight of from 0.5 to 5% by weight. , eg from 2 to 4% by weight.
  • Component 3 one or more non-melting ("refractory") particulate materials in the casting process, are, for example, refractory granular materials such as chromite sand, alumina, zircon sand, alumium silicate, chamotte, silicon carbide, mullite, graphite, fosterite, synthetic ceramic sand, or especially heat resistant Sands, such as quartz or foundry sand, metal beads or granules, for example of iron or copper, but also soluble salts, such as sodium chloride, or Mixtures of two or more of such components.
  • refractory granular materials such as chromite sand, alumina, zircon sand, alumium silicate, chamotte, silicon carbide, mullite, graphite, fosterite, synthetic ceramic sand, or especially heat resistant Sands, such as quartz or foundry sand, metal beads or granules, for example of iron or copper, but also soluble salts, such as
  • additives are, in particular, agents for increasing the flowability, for example corresponding surfactants or wetting agents, such as anionic, cationic, amphoteric or nonionic surfactants, or two or more thereof, along with further additives, such as water, or the like, which are preferably based on the total mass of the component (3), for example, in a proportion of a total of or preferably a total of 0 to 5 wt .-% may be added, such as from 0.01 to 1 wt .-%, in water, for example to 4 %.
  • the use according to the invention comprises that the available mixture is introduced into a molding or core tool, for example by encasing.
  • a molding or core tool for example by encasing.
  • the mixture is heated to temperatures below the temperature of the molten metal or alloy to be cast, for example in one possible preferred embodiment more than 200 ° C. below this temperature, for example (absolute) at 250 ° C. or below, in one possible preferred example the temperature is between 80 ° and 200 ° C., for example 100 ° and 100 ° with 150 ° C.
  • the available green molds and / or cores are suitable for use and, in a still further preferred embodiment of the invention, if necessary after removal from the mold or core tool, are used to make a foundry product (for example, without limitation Suction pipes for engines, cooling pipes, door hinges, nozzles for filling stations, cast iron pipes, faucets, hydraulic valves or the like may be mentioned) by casting arbitrary melts of metals or metal alloys, in particular tin, lead, zinc, bronze, iron, gray cast iron, steel or Aluminum or aluminum alloys.
  • the temperature of the molds and / or cores increases so far that starting with the casting process and also during the cooling phase, for example by reactions of liberated cations and / or anions of the sparingly soluble metal salts as described above, the molds and / or cores used are converted into such a state that they are in a further, corresponding to a still further preferred embodiment of the present use invention step of demolding then easily transferred into a pourable form and so mechanically, for example by shaking, ultrasound or knock, or the like, can be removed.
  • the invention also relates to the "green" molds and / or cores obtainable by the above process, processes for their preparation comprising the steps of the above and below use invention, in particular their preferred embodiments, the use of such "green” molds and / or cores Casting of castings and their demolding.
  • a preferred embodiment of the invention relates to the use of water glass, and / or one or more precursors thereof, in the production of molds and / or cores for foundry purposes, said use comprising as component (1) water glass and / or one or more precursors thereof, and as component (2) one or a plurality of sparingly soluble metal salts, and / or mixtures of components (1) and (2), for the production of castable molds and / or cores for foundry purposes, with particulate materials which do not melt during casting as component (3).
  • component (2) one or more hydroxides, carbonates (such as magnesium calcium carbonates, for example dolomite), sulfates (such as kieserite), metal fluorides and / or hydroxides, in particular
  • Zinc, or magnesium oxide can be used free or
  • component (2) calcium fluoride, aluminum fluoride or a mixture is used, or magnesium oxide.
  • component (1) and component (2) are added to component (3) as a mixture or individually.
  • a further preferred embodiment of the invention relates to a use according to one of the preceding four paragraphs, wherein the molar water glass module of the component (1) used, e.g. is 1 to 4, and / or wherein the proportion of component (2) to the dry matter proportions in component (1) is 3 to 1 to 1 to 4.
  • components (1) and (2) based on the proportion by weight of component (3), for example m present in a proportion by weight of 0.1 to 6 wt .-%, in particular in a proportion of 0.5 to 5 wt .-%, for example in a proportion of 2 to 4 wt .-%.
  • the available mixture is introduced into a mold or core tool, in particular, wherein also simultaneously with the introduction into the mold or core tool and / or then the mixture Temperatures of 200 or more degrees Celsius ( 0 C) below the temperature of the metal or alloy melt used for casting a foundry product is heated, in particular to temperatures of 80 to 200 0 C, preferably from 100 to 150 0 C and so a green form and or a green core is produced, and more preferably, where the green form and / or the green core is further used to cast a foundry product.
  • 0 C degrees Celsius
  • Another advantageous embodiment of the invention relates to a method for producing a green mold or a green core for foundry purposes, comprising the steps according to one of the preceding nine paragraphs, or a green form obtainable thereby or a green obtainable thereby Core for foundry purposes.
  • a binder mixture comprising as component (1) water glass and as component (2) a sparingly soluble metal salt is particularly preferred, in particular one in which component (2) is a sparingly soluble hydroxide and / or preferably fluoride of a metal, in particular a fluoride of Calcium or aluminum, or a mixture of such Fuoride, or very preferably, wherein the weight ratio of component (2) to the weight oftmatenalanmaschine in component (1) is 3 to 1 to 1 to 3.
  • a variant of the invention according to the last paragraph relates to a corresponding binder mixture in the dry state, another to a corresponding aqueous binder mixture.
  • Example 1 Binder formulation with calcium fluoride:
  • the binder mixture is one of 70% liquid sodium silicate (modulus 2.5) as component (1) and 29.6% calcium fluoride as component (2) with 0.4% surfactant (sodium lauryl ether sulfate). made as a further additive.
  • Example 2 Binder formulation with sparingly soluble aluminum salts:
  • the binder mixture is one of 70% liquid Potassium silicate (modulus 3.0) as component (1), 20% aluminum fluoride and 5% aluminum hydroxide as component (2), 3.8% water and 0.2% surfactant (glycoside) prepared as a further additive.
  • Example 3 j Binder formulation with sparingly soluble
  • the binder mixture is one prepared from 70% liquid sodium silicate (modulus 2.0) as component (1) and 30% magnesium hydroxide and 10% aluminum hydroxide as component (2).
  • the binder mixture is a dry powder of 35% silica (pyrogenic or precipitated) and 30% concentrated sodium hydroxide solution (dry powder) as component 1 and 35% calcium fluoride as component (2).
  • Example 5 Preparation of mixtures of binders and foundry sand:
  • the finished binder mixture according to one of Examples 1 to 4 is mixed in a weight fraction of 2 to 4%, based on the proportion of foundry sand, with foundry sand (quartz sand) by means of conventional mixers (paddle stirrers).
  • Example 6 Preparation of Cores or Shapes: The mixtures obtained according to Example 5 are injected into mold or core tools and turned into green at about 130 ° C. Hardened molds or cores. In this case, strengths of 200 to 500 N / cm 2 are achieved. Also, a rapid curing in the tool is achieved, for example, only by the penetration of heat and / or hot purge air.
  • Example 7 Casting of moldings and removal of molds and / or cores: An aluminum melt is brought into contact with molds and / or cores according to Example 6 to produce a molded article. After cooling, the cores and / or molds are transferred by simple tapping into a flowable mold and removed.
  • a quartz sand is mixed with 2.5% of a binder of the following composition:
  • This mixture can be stored for several years, as it begins to react only by heat above 100 0 C.
  • this mixture hardens after 30 - 60 sec., So that you can remove these already from the tool. In the following hour, the strength still increases, up to a bending fracture value of about 350 N / cm 2 .
  • the parts made therewith do not show any common sand buildup on contact with the liquid metal (Aluminum and cast iron), and the molds or cores disintegrate after some time (30 - 60 min) and collapse so that they can be easily removed from the casting again.
  • This disintegration happens because the heat of action of the liquid metal (Al at about 700 0 C), the components of the binder mainly to calcium and aluminum silicate connect, which are porous and show no strength.
  • these reaction products can be easily separated from the sand, making it easy to regenerate and reuse. As gas does not develop during casting, the castings have a better surface and less porosity than when made with conventional organic binders.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

L'invention concerne l'utilisation de verre soluble et/ou d'un ou de plusieurs précurseurs de celui-ci, lors de la fabrication de moules et/ou de noyaux pour des applications en fonderie. Cette utilisation consiste à mélanger comme composant (1) du verre soluble et/ou un ou plusieurs précurseurs de celui-ci, comme composant (2) un ou plusieurs sels métalliques peu solubles et/ou des mélanges des composants (1) et (2), pour obtenir des moules et/ou des noyaux pouvant être enlevés après un moulage par coulée en fonderie, ainsi que, comme composant (3), des matières particulaires ne fondant pas lors de la coulée. La présente invention porte également sur la fabrication de moules et/ou de noyaux correspondants, sur des moules et/ou des noyaux correspondants et sur d'autres moules.
EP05809208A 2004-11-29 2005-11-25 Utilisation de sels peu solubles combines a du verre soluble pour fabriquer des moules et des noyaux pour des applications en fonderie Withdrawn EP1850986A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004057669A DE102004057669B3 (de) 2004-11-29 2004-11-29 Verwendung von schwerlöslichen Salzen in Kombination mit Wasserglas im Rahmen der Herstellung von Formen und Kernen für die Gießereitechnik
PCT/EP2005/012624 WO2006058664A2 (fr) 2004-11-29 2005-11-25 Utilisation de sels peu solubles combines a du verre soluble pour fabriquer des moules et des noyaux pour des applications en fonderie

Publications (1)

Publication Number Publication Date
EP1850986A2 true EP1850986A2 (fr) 2007-11-07

Family

ID=36088293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05809208A Withdrawn EP1850986A2 (fr) 2004-11-29 2005-11-25 Utilisation de sels peu solubles combines a du verre soluble pour fabriquer des moules et des noyaux pour des applications en fonderie

Country Status (3)

Country Link
EP (1) EP1850986A2 (fr)
DE (1) DE102004057669B3 (fr)
WO (1) WO2006058664A2 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN107986819A (zh) * 2017-12-04 2018-05-04 东方电气集团东方汽轮机有限公司 一种陶瓷型芯强化剂及其制备方法和使用方法

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
DE102006036381A1 (de) * 2006-08-02 2008-02-07 Minelco Gmbh Formstoff, Gießerei-Formstoff-Gemisch und Verfahren zur Herstellung einer Form oder eines Formlings
DE102006058123A1 (de) * 2006-12-09 2008-06-19 Mahle International Gmbh Formkörper zur Herstellung eines Hohlraumes
DE102007045649B4 (de) 2007-09-25 2015-11-19 H2K Minerals Gmbh Verfahren zur Herstellung einer Form und/oder eines Kernes unter Verwendung von zerkleinerten natürlichen partikulären amorphen Kieselsäurematerialien im Gießereibereich und Binderzusammensetzung
DE102007051850B4 (de) 2007-10-30 2025-08-28 Ask Chemicals Gmbh Verfahren zur Herstellung von Gießformen für die Metallverarbeitung unter Verwendung einer Formstoffmischung mit verbesserter Fliessfähigkeit
DE102008041217A1 (de) * 2008-08-13 2010-02-18 Volkswagen Ag Formstoffbinder für schüttbare Formmassen und Verfahren zum Herstellen von Kerneinsätzen für Gussformen
CN106660109B (zh) 2014-06-20 2019-11-19 旭有机材株式会社 铸型的制造方法和铸型
CN104942220A (zh) * 2015-06-13 2015-09-30 开封东立高压阀门铸造有限公司 一种无机粘结剂热固化法制芯工艺
EP3501690A1 (fr) 2017-12-20 2019-06-26 Imertech Sas Procédé de fabrication d'articles de fonderie de matériau réfractaire a base de particules, et produit fabriqué par ce procédé

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DE1508637A1 (de) * 1965-09-09 1969-10-30 Ebara Chuzo Kabushiki Kaisha C Formsandmischung
US3804643A (en) * 1969-05-27 1974-04-16 Mitsubishi Heavy Ind Ltd Process for producing casting molds using a dry flowable blended sand
LU63429A1 (fr) * 1971-06-28 1973-01-22
JPS626733A (ja) * 1985-07-01 1987-01-13 Hagiwara Kazuyoshi 鋳造用砂型

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN107986819A (zh) * 2017-12-04 2018-05-04 东方电气集团东方汽轮机有限公司 一种陶瓷型芯强化剂及其制备方法和使用方法
CN107986819B (zh) * 2017-12-04 2020-11-10 东方电气集团东方汽轮机有限公司 一种陶瓷型芯强化剂及其制备方法和使用方法

Also Published As

Publication number Publication date
WO2006058664A2 (fr) 2006-06-08
WO2006058664A3 (fr) 2007-11-08
DE102004057669B3 (de) 2006-07-06

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