EP2308614B1 - Aérosand résistant au vert - Google Patents

Aérosand résistant au vert Download PDF

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Publication number
EP2308614B1
EP2308614B1 EP10163884.9A EP10163884A EP2308614B1 EP 2308614 B1 EP2308614 B1 EP 2308614B1 EP 10163884 A EP10163884 A EP 10163884A EP 2308614 B1 EP2308614 B1 EP 2308614B1
Authority
EP
European Patent Office
Prior art keywords
molding sand
sand
mold
casting
core
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.)
Not-in-force
Application number
EP10163884.9A
Other languages
German (de)
English (en)
Other versions
EP2308614A1 (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
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 Deutsches Zentrum fuer Luft und Raumfahrt eV filed Critical Deutsches Zentrum fuer Luft und Raumfahrt eV
Publication of EP2308614A1 publication Critical patent/EP2308614A1/fr
Application granted granted Critical
Publication of EP2308614B1 publication Critical patent/EP2308614B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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.
  • 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 low binder use and yet easy gutting and high surface quality 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 include, for example, synthetic resins such as phenolic, 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 a) 80 to 96% by weight sand b) 1 to 1.7, in particular 1.4 to 1.6 wt .-% phyllosilicate c) 0.9 to 1.1% by weight Xerogel and d) 1.2 to 3.5, in particular 1.5 to 2.5 wt .-% RF Aerogelbindesch.
  • 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)

Claims (8)

  1. Sable de moulage contenant du sable, du liant d'aérogel RF, un phyllosilicate et un xérogel.
  2. Sable de moulage selon la revendication 1, caractérisé en ce que ledit sable comprend des sables Minelco, des sables quartzeux et/ou des sables à l'alumine.
  3. Sable de moulage selon la revendication 1, caractérisé en ce que ledit phyllosilicate comprend du bentonite.
  4. Sable de moulage selon la revendication 1, caractérisé en ce que ledit xérogel comprend du silice hydrophile et/ou du verre soluble.
  5. Sable de moulage selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il contient, par rapport au poids sec du produit final: a) 80 à 96 % en poids de sable b) 1 à 1,7, notamment 1,4 à 1,6, % en poids de phyllosilicate c) 0,9 à 1,1 % en poids de xérogel, et d) 1,2 à 3,5, notamment 1,5 à 2,5, % en poids de liant d'aérogel RF.
  6. Utilisation d'un sable de moulage selon l'une quelconque des revendications 1 à 5 pour la production de moules/noyaux de coulage pour la coulée de moulage des métaux.
  7. Procédé pour la production de moules/noyaux de coulage à partir de sable de moulage selon l'une quelconque des revendications 1 à 6, caractérisé par les étapes consistant à
    a) remplir un moule négatif d'un noyau avec un mélange de sable de moulage, et
    b) enlever le noyau mouillé du moule de noyau, et
    c) sécher le noyau à l'air à des températures comprises entre la température ambiante et 80 °C.
  8. Procédé pour la production de moules/noyaux de coulage à partir de sable de moulage selon la revendication 7, caractérisé en ce que les moules/noyaux sont déshydratés sous vide à une température de 200 °C à 300 °C.
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 EP2308614A1 (fr) 2011-04-13
EP2308614B1 true 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)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103042161B (zh) * 2012-12-25 2015-09-02 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
CN103042155B (zh) * 2012-12-25 2015-09-16 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
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
CN116571687A (zh) * 2015-12-15 2023-08-11 罗伯特·博世有限公司 在三维打印工艺下制造铸造砂型、尤其是铸造砂芯的方法以及在该方法中使用的砂混合物
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

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743037C (de) * 1941-07-02 1943-12-16 Maizena Werke A G Deutsche Verfahren zur Herstellung geschuetteter Kernmassen
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
FR2561553B1 (fr) * 1984-03-23 1987-06-19 Harborchem Inc Composition de liant refractaire et son procede d'obtention
DE3410628A1 (de) * 1984-03-22 1985-09-26 Harborchem Inc., Livingston, N.J. Bindemittelmasse und feuerfeste masse und verfahren zu deren herstellung
RU2082536C1 (ru) * 1993-06-21 1997-06-27 Акционерное общество "Камский автомобильный завод" Смесь для изготовления литейных форм и стержней
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
DE10352574A1 (de) 2003-11-11 2005-06-16 Deutsches Zentrum für Luft- und Raumfahrt e.V. Füllstoff enthaltende Aerogele
DE10357539A1 (de) 2003-12-10 2005-07-21 Deutsches Zentrum für Luft- und Raumfahrt e.V. Herstellung von füllstoffhaltigen Aerogelen
DE102006021151A1 (de) 2006-05-06 2007-11-08 Deutsches Zentrum für Luft- und Raumfahrt e.V. Kernwerkstoff aus tonhaltigem Sand enthaltendem Aerogelsand
DE102006056093B4 (de) * 2006-11-17 2012-09-27 Deutsches Zentrum für Luft- und Raumfahrt e.V. Kernwerkstoff aus Aerogelsand enthaltend Additivsand und dessen Verwendung

Also Published As

Publication number Publication date
DE102009024013A1 (de) 2010-12-09
EP2308614A1 (fr) 2011-04-13

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