EP2308614A1 - Aérosand résistant au vert - Google Patents

Aérosand résistant au vert Download PDF

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Publication number
EP2308614A1
EP2308614A1 EP10163884A EP10163884A EP2308614A1 EP 2308614 A1 EP2308614 A1 EP 2308614A1 EP 10163884 A EP10163884 A EP 10163884A EP 10163884 A EP10163884 A EP 10163884A EP 2308614 A1 EP2308614 A1 EP 2308614A1
Authority
EP
European Patent Office
Prior art keywords
sand
core
cores
molding
molding 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.)
Granted
Application number
EP10163884A
Other languages
German (de)
English (en)
Other versions
EP2308614B1 (fr
Inventor
Barbara Milow
Lorenz Ratke
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.)
Deutsches Zentrum fuer Luft und Raumfahrt eV
Original Assignee
Deutsches Zentrum fuer Luft und Raumfahrt eV
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Publication of EP2308614A1 publication Critical patent/EP2308614A1/fr
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Publication of EP2308614B1 publication Critical patent/EP2308614B1/fr
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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
    • B22C1/18—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
    • B22C1/183—Sols, colloids or hydroxide gels
    • 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

Definitions

  • the present invention relates to aerogelsands which have green strength by addition of phyllosilicate and xerogel, their use for the production of molds / cores for the casting of metals and a process for the production of such molds / cores.
  • Shapes and cores are usually sand-cast from quartz sand, for special applications but also from other sands (alumina, zirconia, olivine, chrome ore, and others), in which the Sand grains are glued together by polymeric or water glass binder and form a dimensionally stable bond for the duration of mold filling with liquid metal. This should as simple as possible be dissolved again after the solidification of the melt, which is especially true for cores, the complex shaped cavities in the casting negative image. For coring or dissolution of the mold mechanical (shaking, shaking, knocking) or thermal aids and pressurized water can be used.
  • Some of today's binders will be complex chemically modified (chemical additives) to meet the requirements of foundries, such as high thermal stability with low outgassing and binder use and yet easy gutting and high surface finish of the resulting metal casting.
  • Binders for molding sands may be inorganic or organic in nature, with inorganic binders being subdivided into, for example, natural or synthetic inorganic binders.
  • Organic binders for example, include synthetic resins such as phenol, urea and furan resins.
  • Inorganic binders include, for example, clays, cement or gypsum.
  • oils, carbohydrate binders, water-soluble liquid binders, dextrose or pitch binders can also be used ( A. Carrier "Foundry Technology" in Ullmann's Encyclopedia of Industrial Chemistry, Weinheim VCH, 5th Edition, Volume A 12, pp. 35-46 ).
  • binders as described in the prior art can not be considered optimal.
  • the casting cores are often difficult to remove, so that remains of the molding sand stick to the metal casting. This is a complex surface treatment and / or cleaning the metal piece necessary. In addition, it can lead to deformation or cracking of the workpiece.
  • aerogels have opened up in recent years. Aerogels are highly porous, open-pore solids, which are usually obtained via sol-gel processes via the gelation of colloid-disperse solutions and subsequent mostly supercritical drying.
  • Aerogels can be mixed with different fillers. So, for example, deals EP 1 697 273 B1 with aerogels which are mixed with inorganic hollow spheres. This leads to a low thermal conductivity of the resulting airgel molding.
  • EP 1 682 291 B1 also deals with a filler-containing airgel.
  • the gelation time of the filler-containing airgel has been shortened by the fact that the sol is already pre-treated and only then is the filler added.
  • DE 10216403 B4 is concerned with molding materials for the casting of metals or metal alloys and their use for the production of mold and core materials with particularly good thermal conductivity, which are also fully recyclable.
  • the molding materials described herein contain open-pored plastic aerogels and inorganic SiC fillers in an amount of at least 70% by volume.
  • EP 1 852 197 A1 describes a core material made of clay-containing sand containing Aerogelsand containing swellable phyllosilicates. Such molding sand has a higher ultimate strength than Aerogelsande, which contain no phyllosilicates.
  • the aerogels binders can be cored easily by thermal means, since the nanostructured binder bridges are easily oxidized at temperatures around 300 ° C and the airgel thereby decomposes. Their strength is good to sufficient, but the use of the aerosol binder solution, which contains a lot of water, causes the sand-binder solution mixture to have no green strength but needs to build up only after gelation. Green strength is within the meaning of the invention, the strength of moist mold sands with uniform material and temperature distribution.
  • the object of the present invention is therefore to provide a molding sand for the production of foundry molds / cores, which reduces or even eliminates the problems known from the prior art, such as adhesion of the sand to the metal.
  • Another object of the present invention is to provide a sand having a sufficient green strength, while at the same time easily removing the core / mold after metal casting.
  • the object underlying the invention is achieved by a molding sand which contains sand, RF aerogel binder, phyllosilicate and xerogel.
  • a molding sand which contains sand, RF aerogel binder, phyllosilicate and xerogel.
  • a molding sand according to the invention preferably comprises Minelco sands, quartz and / or aluminum oxide sands as sand component.
  • the sands preferably have an average particle size of about 30 ⁇ m. Dust components of the sands are preferably screened to obtain a better surface finish of the metal casting.
  • RF aerogels according to the invention comprise colloidal substances which are gelled and dried under critical conditions.
  • RF stands for resorcinol-formaldehyde and thus for a class of known aerogels. They have a low density and high open porosity. Up to 95% of the volume of the aerogels consists of pores. Aerogels are considered to be one of the lightest materials and have a high thermal insulation capacity.
  • RF aerogels can be obtained by sol-gel polymerization of resorcinol with formaldehyde.
  • bentonite is preferably used for the purposes of the present invention.
  • Xerogel in particular hydrophilic silica and / or water glass are used, which is commercially available.
  • the particle size distribution of the RF Aerogelbindeschs, the phyllosilicate and the xerogel are preferably adapted to the sand. This allows a uniform mixing of the individual components.
  • According to the invention includes an airgel sand
  • the percentages by weight are in each case based on the weight of a dry, fully hardened core or a corresponding shape.
  • a xerogel is added in addition. Surprisingly, this combination shows a high green strength and at the same time easy destemmability.
  • the xerogel acts as a siccative to collect any excess binder. In the present case, water serves as a binder. If a core is made of sand, the molding sand is shot by a core shooter with high pressure in a corresponding shape. Due to the high pressure not only the sand-binder gas mixture is strongly and evenly compacted, but as a side effect, the binder is pressed from the sand interstices to the edge of the mold.
  • the object underlying the present invention is described by the production of molds / cores for the casting of metals from such a molding sand.
  • the method comprises producing a casting mold / casting core with a molding sand mixture by filling a negative mold of a core / mold with it.
  • the wet core / wet form is removed from the (core) mold and dried at temperatures ranging from room temperature up to 80 ° C in air. If the casting cores are to be stored for a long time, it has proven advantageous to dehydrate them. In particular, it has been shown that dehydrogenation in vacuo at temperatures of 200 to 300 ° C increases the storage stability of the cores.
  • a sand mixture of 88% by weight of MinSand (fine, 230), 1.5% by weight of commercially available bentonite and 1.00% by weight of xerogel (particle size ⁇ 280 ⁇ m) was mixed with 9.5% by weight of an aerosol solution of the following composition: resorcinol : H 2 O (deion.) (0.044: 1), resorcinol: formaldehyde solution (0.72: 1), resorcinol: Na 2 CO 3 (1512: 1), processed into foundry sand in a mixer.
  • the quantities refer to the wet mixture during production.
  • the molding sand mixture was filled into a core shooter and benders (20mm x 20mm x 150mm) were shot at a pressure of 5.5 bar. After that, the still wet cores became taken from the core mold and gelled at 40 ° C for 30 minutes in air and dried.
  • the molding sand mixture was filled into a core shooter and benders (20mm x 20mm x 150mm) were shot at a pressure of 5.5 bar. Subsequently, the still wet cores were taken out of the core mold and gelled at 40 ° C for 30 minutes in air and dried.
  • the green strength was not determined by mechanical characteristics but by the possibility of removing the cores from the mold by hand or tool immediately after production.
  • the handleability immediately shows a strength necessary for industrial use.
  • the cores thus produced are storable for a period of at least 6 months without loss of strength.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Mold Materials And Core Materials (AREA)
EP10163884.9A 2009-06-05 2010-05-26 Aérosand résistant au vert Not-in-force EP2308614B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009024013A DE102009024013A1 (de) 2009-06-05 2009-06-05 Grünfeste Aerosande

Publications (2)

Publication Number Publication Date
EP2308614A1 true EP2308614A1 (fr) 2011-04-13
EP2308614B1 EP2308614B1 (fr) 2016-02-10

Family

ID=43049212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10163884.9A Not-in-force EP2308614B1 (fr) 2009-06-05 2010-05-26 Aérosand résistant au vert

Country Status (2)

Country Link
EP (1) EP2308614B1 (fr)
DE (1) DE102009024013A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103042155A (zh) * 2012-12-25 2013-04-17 马鞍山市万鑫铸造有限公司 一种含草木灰的型砂及其制备方法
CN103042157A (zh) * 2012-12-25 2013-04-17 马鞍山市万鑫铸造有限公司 一种含黄壤土的型砂及其制备方法
CN103042161A (zh) * 2012-12-25 2013-04-17 马鞍山市万鑫铸造有限公司 一种含石英砂的型砂及其制备方法
DE102017107531A1 (de) * 2017-04-07 2018-10-11 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Verfahren zur Herstellung von Gießformen, Kernen und daraus regenerierten Formgrundstoffen
CN115555514A (zh) * 2022-10-26 2023-01-03 柳晶科技集团股份有限公司 一种环保耐高温覆膜砂及其制备工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2016371668A1 (en) * 2015-12-15 2018-08-02 Robert Bosch Gmbh Method for producing a foundry sand mold, in particular a foundry sand core, including a three-dimensional printing method, and sand mixture for use in the method

Citations (8)

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DE3410628A1 (de) * 1984-03-22 1985-09-26 Harborchem Inc., Livingston, N.J. Bindemittelmasse und feuerfeste masse und verfahren zu deren herstellung
FR2561553A1 (fr) * 1984-03-23 1985-09-27 Harborchem Inc Composition de liant refractaire et son procede d'obtention
WO1996015998A1 (fr) * 1994-11-23 1996-05-30 Hoechst Aktiengesellschaft Materiau composite contenant un aerogel, son procede de fabrication et son utilisation
DE10216403B4 (de) 2002-04-12 2004-03-18 Deutsches Zentrum für Luft- und Raumfahrt e.V. Aerogelgebundene Formstoffe mit hoher Wärmeleitfähigkeit
EP1682291B1 (fr) 2003-11-11 2007-05-09 Deutsches Zentrum für Luft- und Raumfahrt e.V. Aerogels contenant une matiere de charge
EP1697273B1 (fr) 2003-12-10 2007-09-05 DLR Deutsches Zentrum für Luft- und Raumfahrt e.V. Production d'aerogels contenant une charge
EP1852197A1 (fr) 2006-05-06 2007-11-07 Deutsches Zentrum für Luft- und Raumfahrt e.V. Matériau pour la confection de noyaux de fonderie à base d'aérogel de silice contenant une argile gonflante
DE102006056093A1 (de) * 2006-11-17 2008-05-21 Deutsches Zentrum für Luft- und Raumfahrt e.V. Aerosand-Additive

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JPS517127B2 (fr) * 1971-11-29 1976-03-05
JPS51119321A (en) * 1975-04-11 1976-10-19 Hayashibara Biochem Lab Sand mold composite material for casting metal
JPS5691957A (en) * 1979-12-26 1981-07-25 Kao Corp Production of self-hardening mold
RU2082536C1 (ru) * 1993-06-21 1997-06-27 Акционерное общество "Камский автомобильный завод" Смесь для изготовления литейных форм и стержней

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DE3410628A1 (de) * 1984-03-22 1985-09-26 Harborchem Inc., Livingston, N.J. Bindemittelmasse und feuerfeste masse und verfahren zu deren herstellung
FR2561553A1 (fr) * 1984-03-23 1985-09-27 Harborchem Inc Composition de liant refractaire et son procede d'obtention
WO1996015998A1 (fr) * 1994-11-23 1996-05-30 Hoechst Aktiengesellschaft Materiau composite contenant un aerogel, son procede de fabrication et son utilisation
DE10216403B4 (de) 2002-04-12 2004-03-18 Deutsches Zentrum für Luft- und Raumfahrt e.V. Aerogelgebundene Formstoffe mit hoher Wärmeleitfähigkeit
EP1682291B1 (fr) 2003-11-11 2007-05-09 Deutsches Zentrum für Luft- und Raumfahrt e.V. Aerogels contenant une matiere de charge
EP1697273B1 (fr) 2003-12-10 2007-09-05 DLR Deutsches Zentrum für Luft- und Raumfahrt e.V. Production d'aerogels contenant une charge
EP1852197A1 (fr) 2006-05-06 2007-11-07 Deutsches Zentrum für Luft- und Raumfahrt e.V. Matériau pour la confection de noyaux de fonderie à base d'aérogel de silice contenant une argile gonflante
DE102006056093A1 (de) * 2006-11-17 2008-05-21 Deutsches Zentrum für Luft- und Raumfahrt e.V. Aerosand-Additive

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BRUECK S ET AL: "RF-aerogels: A new binding material for foundry application", JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, KLUWER ACADEMIC PUBLISHERS, BO, vol. 26, no. 1-3, 1 January 2003 (2003-01-01), pages 663 - 666, XP002442391, ISSN: 1573-4846, DOI: 10.1023/A:1020709129165 *
LORENZ RATKE ET AL: "Mechanical properties of aerogel composites for casting purposes", JOURNAL OF MATERIALS SCIENCE, KLUWER ACADEMIC PUBLISHERS, BO, vol. 41, no. 4, 1 February 2006 (2006-02-01), pages 1019 - 1024, XP019211565, ISSN: 1573-4803, DOI: 10.1007/S10853-005-3152-8 *
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103042155A (zh) * 2012-12-25 2013-04-17 马鞍山市万鑫铸造有限公司 一种含草木灰的型砂及其制备方法
CN103042157A (zh) * 2012-12-25 2013-04-17 马鞍山市万鑫铸造有限公司 一种含黄壤土的型砂及其制备方法
CN103042161A (zh) * 2012-12-25 2013-04-17 马鞍山市万鑫铸造有限公司 一种含石英砂的型砂及其制备方法
CN103042157B (zh) * 2012-12-25 2015-03-18 马鞍山市万鑫铸造有限公司 一种含黄壤土的型砂及其制备方法
DE102017107531A1 (de) * 2017-04-07 2018-10-11 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Verfahren zur Herstellung von Gießformen, Kernen und daraus regenerierten Formgrundstoffen
WO2018185251A1 (fr) 2017-04-07 2018-10-11 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Procédé de production de moules de coulée, de noyaux et de matières de base de moulage régénérées à partir de ces derniers
EP3606690B1 (fr) * 2017-04-07 2021-06-09 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Procédé de production de moules de coulée, de noyaux et de matières de base de moulage régénérées à partir de ces derniers
US11065676B2 (en) 2017-04-07 2021-07-20 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Method for producing casting molds, cores and basic mold materials regenerated therefrom
CN115555514A (zh) * 2022-10-26 2023-01-03 柳晶科技集团股份有限公司 一种环保耐高温覆膜砂及其制备工艺

Also Published As

Publication number Publication date
DE102009024013A1 (de) 2010-12-09
EP2308614B1 (fr) 2016-02-10

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