EP2014392A2 - Mélange de matière à mouler, pièce brute pour des besoins de fonderie et procédé de fabrication d'une pièce brute - Google Patents

Mélange de matière à mouler, pièce brute pour des besoins de fonderie et procédé de fabrication d'une pièce brute Download PDF

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Publication number
EP2014392A2
EP2014392A2 EP08007906A EP08007906A EP2014392A2 EP 2014392 A2 EP2014392 A2 EP 2014392A2 EP 08007906 A EP08007906 A EP 08007906A EP 08007906 A EP08007906 A EP 08007906A EP 2014392 A2 EP2014392 A2 EP 2014392A2
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EP
European Patent Office
Prior art keywords
molding
grain size
binder
particles
material mixture
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
EP08007906A
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German (de)
English (en)
Other versions
EP2014392B1 (fr
EP2014392A3 (fr
Inventor
Bettina Wehren
Ralf-Joachim Gerlach
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.)
Imerys Metalcasting Germany GmbH
Original Assignee
Minelco 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=39830346&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2014392(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Minelco GmbH filed Critical Minelco GmbH
Priority to SI200830356T priority Critical patent/SI2014392T1/sl
Priority to PL08007906T priority patent/PL2014392T3/pl
Publication of EP2014392A2 publication Critical patent/EP2014392A2/fr
Publication of EP2014392A3 publication Critical patent/EP2014392A3/fr
Application granted granted Critical
Publication of EP2014392B1 publication Critical patent/EP2014392B1/fr
Revoked 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
    • B22C1/186—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
    • 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
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • the invention relates to a molding material mixture for foundry purposes, consisting of molding sand, caustic soda, alkali-silicate-based binders and aggregates and a molding for foundry purposes, prepared using the molding material mixture.
  • the invention also relates to a method for producing a molded article.
  • Formstoffmischept of the type mentioned are for example from the DE 102004042535 A1 (AS LÜNGEN GmbH) known.
  • the binder used is an alkali water glass in combination with a particulate metal oxide, for example silica, alumina, titania or zinc oxide, in order to improve the strength of casting molds both immediately after shaping and curing and after storage and increased air humidity.
  • the particle size of the metal oxides is preferably less than 300 microns, according to the examples, the sieve residue on a sieve with a mesh size of 63 microns less than 10% by weight, preferably less than 8% by weight.
  • U.S. Pat US 5,641,015 Another method for producing molding mixtures which is intended to achieve high strength in combination with a polyphosphate or borate binder is disclosed in U.S. Pat US 5,641,015 described.
  • column 4, line 39 of the US patent the release of water is mentioned as a result of the drying of polyphosphate and borate-containing binders, which is to be absorbed by the addition of ultrafine silica.
  • the ultrafine silica consists of porous primary particles produced by a precipitation process with grain sizes between 10 and 60 nm, which agglomerate to secondary particles with a particle size of several ⁇ m (column 3, lines 64-66 of the US patent).
  • An inorganic binder system for molding materials is in the EP 1095719B1 described.
  • the flowability can be improved by adding 8-10% by weight of silicone oil with respect to the binder. This improvement was accompanied by a higher moisture content of the core sand.
  • Another important parameter is the progress of curing and the reduction of sensitivity to humidity.
  • the main quality feature is the surface quality of the casting achievable with the molding material mixture.
  • the known processes are not sufficiently stable under the conditions prevailing in mass production, so that again and again high reject rates and unacceptable additional costs result from reworking.
  • As a yardstick for the assessment of the surface quality the determination of the area fraction of sand deposits on the cast part has proven itself.
  • the drying process has an outstanding influence on the formation of the roughness on the surfaces of the moldings.
  • it is necessary to influence the distribution of the mountain and valley structure in such a way that a relief structure arises which has a height-depth difference ratio of at most 300 nm.
  • both thermal drying and microwave drying into consideration, with very good storage capabilities, especially without microwave drying were achieved even under extreme storage conditions at humidities above 78% and storage temperatures of more than 33 ° C.
  • the binder layer present on the particles in the molding material mixture shrinks to form a substructure of mountains and valleys.
  • a morphology of the substructure is formed, which is characterized by a height-depth difference of max. 300 nm, caused by cracking during the two-stage shrinking process.
  • energy is introduced directly into the moist binder shell.
  • the resulting hardening of the binder cover (surface) leads by the subsequent thermal drying to crack formation in the nano range (substructure).
  • the fluidity is given as GF-flowability, the determination was carried out according to Brunhuber, 16th edition, page 352/353.
  • test specimens standard test specimens measuring 22.5 ⁇ 22.5 ⁇ 180 mm were produced and subjected to the respective experimental conditions.
  • a quartz sand-based molding material mixture could be produced, which far exceeds the properties of the known products in terms of flowability, flexural strength and curing, if used as aggregate the two particle size classifications mentioned in claim 1 become.
  • the micrometer-sized, amorphous SiO 2 spheres are intended to allow the individual molding sand grains to be spaced apart from each other and to allow them to slide off relative to one another in a facilitated manner.
  • This "skating effect" was confirmed by flowability measurements, for example by the drastically sinking stirring resistance during the introduction of the suspension composed of two different grain classifications according to the invention in a wing mixer.
  • the power consumption of the wing mixer decreased by more than 50%, while the effect without surcharge was below 10%, based on the current consumption before addition.
  • the dosing order of the individual components and their mixing time must be taken into account.
  • the dosing order is: 1.
  • the quartz sand is mixed with caustic soda.
  • An alkali silicate binder is added.
  • the addition of suspension according to the invention with NanoSiO 2 and MikroSiO 2 plus water is added to the basic mixture.
  • the mixing time depends on the type of mixing unit used and should be determined experimentally. In this case, the minimum required duration for the mixture is the respectively desired state (homogenization / uniform distribution).
  • masterbatch indicates a mixture of foundry sand, NaOH and alkali silicate binder in varying composition.
  • Basic mixture of a classic binder system Halterner molding sand, determined according to Brunhuber p. 400 NaOH 0.20% Alkali silicate binder 1.80% GF flowability 73% additive: - GF flowability determined according to Brunhuber p.
  • FIG. 1 graphically reproduces the listed results. The comparison of the test results clearly shows that the suspension causes an improvement in flowability. In addition, it becomes clear that the addition of the equivalent amount of water from the suspension has no influence on the flowability.
  • FIG. 7 illustrates that the flowability (after GF) of the core sand increases by the inventive addition of present in 2 grain classifications SiO 2 balls.
  • the microSiO 2 spheres are kept at a distance by the NanoSiO 2 spheres and allow the so-called “roller skate effect", ie a rolling of the sand grains through the MikroSiO 2 spheres arranged between them
  • the determined bending strengths are in Fig. 2 graphically illustrated.
  • the comparison of the flexural strength of a core sand base mixture without additive C and the flexural strength of a core sand base mixture containing the additive C clearly shows that with a surcharge according to the invention a 3 increased flexural strength.
  • this time difference also does not matter, i. the strength of all three test bars are approximately equal.
  • test bars provided with the additive C are examined, it is found that the bending strength increases steadily during the test procedure (from the first to the second test bar).
  • the molding material mixtures were transferred to the storage bunker of a hot box core shooting machine from Rölperwerk foundry machines whose mold was heated to 180.degree.
  • the molding material mixtures were introduced into the mold by means of compressed air (5 bar) and remained in the mold for a further 35 seconds.
  • the mold was opened and the molding was removed. In order to achieve the maximum strength, the molding is post-dried in the microwave. Subsequently, the casting was poured off in open hand casting.
  • the molding was removed and the casting surface was evaluated for the type and amount of sand buildup.
  • FIG. 8 illustrates the molding used to make the casting used here.
  • the percentages of the sand adhesions relate to the outer surface in the region of the bulged casting region R, which is formed as a continuously curved bulge R in the molding.
  • FIG. 6 gives the test results graphically.
  • a significantly improved casting surface is achieved in comparison to the base mixture according to Ex. A) 1, according to US '015 (amorphous SiO 2 spheres constructed from nanoparticles) and according to DE' 535 (amorphous, synthetic silicic acid in spherical form).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP08007906A 2007-06-12 2008-04-24 Mélange de matière à mouler, pièce brute pour des besoins de fonderie et procédé de fabrication d'une pièce brute Revoked EP2014392B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200830356T SI2014392T1 (sl) 2007-06-12 2008-04-24 Zmes materiala za ulivanje, oblikovanec za livarske namene in postopek izdelave oblikovanca
PL08007906T PL2014392T3 (pl) 2007-06-12 2008-04-24 Mieszanka materiału formierskiego, kształtka formowana do celów odlewniczych i sposób wytwarzania kształtki formowanej

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007027577A DE102007027577A1 (de) 2007-06-12 2007-06-12 Formstoffmischung, Formling für Gießereizwecke und Verfahren zur Herstellung eines Formlings

Publications (3)

Publication Number Publication Date
EP2014392A2 true EP2014392A2 (fr) 2009-01-14
EP2014392A3 EP2014392A3 (fr) 2010-07-21
EP2014392B1 EP2014392B1 (fr) 2011-06-01

Family

ID=39830346

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08007906A Revoked EP2014392B1 (fr) 2007-06-12 2008-04-24 Mélange de matière à mouler, pièce brute pour des besoins de fonderie et procédé de fabrication d'une pièce brute

Country Status (19)

Country Link
US (1) US8006745B2 (fr)
EP (1) EP2014392B1 (fr)
JP (1) JP4719248B2 (fr)
KR (1) KR101027030B1 (fr)
CN (1) CN101323008B (fr)
AR (1) AR066992A1 (fr)
AT (1) ATE511419T1 (fr)
AU (1) AU2008202587B2 (fr)
BR (1) BRPI0803387A2 (fr)
CA (1) CA2631908C (fr)
DE (1) DE102007027577A1 (fr)
DK (1) DK2014392T3 (fr)
ES (1) ES2365827T3 (fr)
MX (1) MX2008007515A (fr)
NZ (1) NZ568939A (fr)
PL (1) PL2014392T3 (fr)
RU (1) RU2385201C2 (fr)
SI (1) SI2014392T1 (fr)
UA (1) UA88412C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012020509A1 (de) 2012-10-19 2014-06-12 Ask Chemicals Gmbh Formstoffmischungen auf der Basis anorganischer Bindemittel und Verfahren zur Herstellung von Formen und Kerne für den Metallguss
WO2020229623A1 (fr) * 2019-05-16 2020-11-19 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Utilisation d'un matériau particulaire comprenant un dioxyde de silicium amorphe synthétique sous forme de particules en tant qu'additif destiné à un mélange de matière de moulage, ainsi que procédés, mélanges et kits correspondants

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DE102010023644A1 (de) * 2009-07-01 2011-01-05 Ksm Castings Gmbh Verfahren zum Gießen eines Materials, Verwendung des Verfahrens, Gießform zur Durchführung des Verfahrens und nach dem Verfahren bzw. in der Gießform hergestellte Gegenstände sowie Kern zum Einlegen in eine solche Gießform
KR101199111B1 (ko) * 2009-10-30 2012-11-09 현대자동차주식회사 주물용 중자 재료 혼합물, 주물용 중자 제조방법 및 이를 이용하여 제조된 주물용 중자
US8974587B2 (en) 2010-11-15 2015-03-10 Honda Motor Co., Ltd. Casting sand core composition
JP4920794B1 (ja) * 2011-11-02 2012-04-18 株式会社ツチヨシ産業 鋳型材料及び鋳型並びに鋳型の製造方法
DE102012103705A1 (de) 2012-04-26 2013-10-31 Ask Chemicals Gmbh Verfahren zur Herstellung von Formen und Kernen für den Metallguss sowie nach diesem Verfahren hergestellte Formen und Kerne
DE102012020511A1 (de) 2012-10-19 2014-04-24 Ask Chemicals Gmbh Formstoffmischungen auf der Basis anorganischer Bindemittel und Verfahren zur Herstellung von Formen und Kerne für den Metallguss
DE102012020510B4 (de) 2012-10-19 2019-02-14 Ask Chemicals Gmbh Formstoffmischungen auf der Basis anorganischer Bindemittel und Verfahren zur Herstellung von Formen und Kerne für den Metallguss
DE102013106276A1 (de) * 2013-06-17 2014-12-18 Ask Chemicals Gmbh Lithiumhaltige Formstoffmischungen auf der Basis eines anorganischen Bindemittels zur Herstellung von Formen und Kernen für den Metallguss
JP6141539B2 (ja) 2013-10-19 2017-06-07 ピーク ドイチュラント ゲゼルシャフト ミット ベシュレンクテル ハフツングＰｅａｋ Ｄｅｕｔｓｃｈｌａｎｄ ＧｍｂＨ 鋳造品製造のためのロストコア又は成形品を製造する方法
DE102013111626A1 (de) * 2013-10-22 2015-04-23 Ask Chemicals Gmbh Formstoffmischungen enthaltend eine oxidische Bor-Verbindung und Verfahren zur Herstellung von Formen und Kernen
DE102014106178A1 (de) * 2014-05-02 2015-11-05 Ask Chemicals Gmbh Verfahren zum schichtweisen Aufbau von Körpern umfassend feuerfesten Formgrundstoff und Resole und Formen oder Kerne hergestellt nach diesem Verfahren
DE102014109598A1 (de) * 2014-07-09 2016-01-14 Tenedora Nemak, S.A. De C.V. Gießkern, Verwendung eines Gießkerns und Verfahren zur Herstellung eines Gießkerns
CN104174810A (zh) * 2014-08-29 2014-12-03 无锡柯马机械有限公司 一种铸造工艺
CN104384437A (zh) * 2014-11-17 2015-03-04 无锡市百顺机械厂 一种铸造工艺
KR101527909B1 (ko) * 2014-12-16 2015-06-10 한국생산기술연구원 주조용 무기 바인더 조성물
KR101614401B1 (ko) * 2015-03-10 2016-04-21 (주)피알테크 주물사용 무기 바인더 조성물
DE102016110752A1 (de) 2016-06-10 2017-12-14 Dr Axion Co., Ltd. Bindemittelzusammensetzung zum vergiessen
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
DE102019123374A1 (de) 2019-08-30 2021-03-04 Bindur Gmbh Verfahren zur Herstellung von Kernen und Formen im Sandformverfahren
DE102019123372A1 (de) 2019-08-30 2021-03-04 Bindur Gmbh Warmhärtender Formstoff zur Herstellung von Kernen und Formen im Sandformverfahren
CN114101593B (zh) * 2021-11-26 2023-08-01 陕西科技大学 一种高溃散、可回收氧化硅基陶瓷型芯及其制备方法和应用

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EP1095719B1 (fr) 1999-10-26 2005-12-28 Hydro Aluminium Deutschland GmbH Liant, sable à noyaux et leur procédé de fabrication
DE102004042535A1 (de) 2004-09-02 2006-03-09 AS Lüngen GmbH & Co. KG Formstoffmischung zur Herstellung von Gießformen für die Metallverarbeitung

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EP1095719B1 (fr) 1999-10-26 2005-12-28 Hydro Aluminium Deutschland GmbH Liant, sable à noyaux et leur procédé de fabrication
DE102004042535A1 (de) 2004-09-02 2006-03-09 AS Lüngen GmbH & Co. KG Formstoffmischung zur Herstellung von Gießformen für die Metallverarbeitung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012020509A1 (de) 2012-10-19 2014-06-12 Ask Chemicals Gmbh Formstoffmischungen auf der Basis anorganischer Bindemittel und Verfahren zur Herstellung von Formen und Kerne für den Metallguss
EP3950168A1 (fr) 2012-10-19 2022-02-09 ASK Chemicals GmbH Melanges de matière à mouler à base de liant inorganique et procédé de production de moules et de noyaux pour la coulee de métaux
WO2020229623A1 (fr) * 2019-05-16 2020-11-19 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Utilisation d'un matériau particulaire comprenant un dioxyde de silicium amorphe synthétique sous forme de particules en tant qu'additif destiné à un mélange de matière de moulage, ainsi que procédés, mélanges et kits correspondants

Also Published As

Publication number Publication date
SI2014392T1 (sl) 2011-09-30
AU2008202587B2 (en) 2010-01-28
AR066992A1 (es) 2009-09-23
RU2385201C2 (ru) 2010-03-27
ES2365827T3 (es) 2011-10-11
CN101323008A (zh) 2008-12-17
US20080314549A1 (en) 2008-12-25
AU2008202587A1 (en) 2009-01-08
JP2008307604A (ja) 2008-12-25
JP4719248B2 (ja) 2011-07-06
MX2008007515A (es) 2009-03-04
CA2631908C (fr) 2011-07-12
PL2014392T3 (pl) 2011-10-31
EP2014392B1 (fr) 2011-06-01
UA88412C2 (ru) 2009-10-12
KR101027030B1 (ko) 2011-04-11
DK2014392T3 (da) 2011-09-12
KR20080109624A (ko) 2008-12-17
CA2631908A1 (fr) 2008-12-12
ATE511419T1 (de) 2011-06-15
RU2008123122A (ru) 2009-12-20
EP2014392A3 (fr) 2010-07-21
NZ568939A (en) 2009-09-25
CN101323008B (zh) 2012-11-21
BRPI0803387A2 (pt) 2009-08-04
US8006745B2 (en) 2011-08-30
DE102007027577A1 (de) 2008-12-18

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