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WO1994026438A1 - Sable de fonderie, son procede de production et ses applications - Google Patents

Sable de fonderie, son procede de production et ses applications Download PDF

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Publication number
WO1994026438A1
WO1994026438A1 PCT/DK1993/000163 DK9300163W WO9426438A1 WO 1994026438 A1 WO1994026438 A1 WO 1994026438A1 DK 9300163 W DK9300163 W DK 9300163W WO 9426438 A1 WO9426438 A1 WO 9426438A1
Authority
WO
WIPO (PCT)
Prior art keywords
sand
particles
feldspar
moulding
quartz
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.)
Ceased
Application number
PCT/DK1993/000163
Other languages
English (en)
Inventor
Palle Norup JØRGENSEN
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.)
Pv Sand Fredericia AS
Original Assignee
Pv Sand Fredericia AS
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 Pv Sand Fredericia AS filed Critical Pv Sand Fredericia AS
Priority to AU43086/93A priority Critical patent/AU4308693A/en
Priority to PCT/DK1993/000163 priority patent/WO1994026438A1/fr
Publication of WO1994026438A1 publication Critical patent/WO1994026438A1/fr
Anticipated expiration legal-status Critical
Ceased 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

Definitions

  • the present invention relates to a method of manufacturing moulding sand which contains quartz and feldspar, such moulding sand, and the use of same.
  • the moulding sand according to the invention may be used both as sand for cores and as sand for moulds, but it is used prima- ily as sand for cores.
  • Moulding sand which contains a mixture of quartz and feldspar is known from natural occurrences.
  • quartz sand con ⁇ taining feldspar is known, e.g. from Sweden.
  • the quartz sand containing feldspar has turned out to be connected with several drawbacks.
  • the adhesive power of the sand is relatively poor.
  • edges on moulds or cores will break off at ingates because of the poor cohesion.
  • the moulding sand is advantageous as only few so-called blatribs occur on the mate- rial that is casted when using this sand.
  • thermal shocks occur in moulding sand based on quartz.
  • quartz will undergo substantially no expan ⁇ sion during a temperature increase up to 575°C.
  • a drastic and sudden expansion of the quartz will occur, which is known as a thermal shock.
  • the quartz involved may again be heated substantially with ⁇ out expansion.
  • the thermal shock means a high risk of formations of cracks in the sand.
  • the so-called blatribs are formed as liquid material flows into the cracks. It is desirable to use quartz sand because it is resistant to very high temperatures.
  • a buffer in the sand e.g. by adding various substances, e.g. wood flour, which will burn so that the necessary buffer for the expansion of quartz is created.
  • a moulding sand is also known in the form of chromite sand. This sand also provides an advantageous buffer because it has a linear expan ⁇ sion.
  • chromite sand is disadvantageous because it has a vo ⁇ lume weight being approximately three times the volume weight of quartz sand.
  • Chromite sand is further disadvantageous since it is difficult to dispose of the sand waste owing to the chromite contents, which means that it must be deposited under controlled conditions.
  • the inventor who has been working in this field for many years, got the idea of producing a moulding sand containing quartz and feldspar according to a method which is characteristic in that 80-95 parts by weight of free and mainly pure quartz particles are mixed with 5-20 parts by weight of free and mainly pure feldspar particles.
  • the sand produced according to this method turned out to have sur- prisingly good properties.
  • edges breaking off at ingates such as is known from the naturally occurring quartz sand containing feldspar.
  • the use of a moulding sand produced by the method according to the inven ⁇ tion with adequate proportions of feldspar particles and quartz par- tides has demonstrated that mouldings can be made in which the pro ⁇ blem of blatribs is substantially eliminated.
  • any content of bound feldspar in the quartz sand should give rise to a reduced amount of added free feldspar particles.
  • quartz sand should be used which is substantially quite pure and which has a content of quartz of not less than 99 per cent by weight. How- ever, a small proportion of chemically bound feldspar may be con ⁇ tained.
  • the properties of the produced moulding sand are also affected by the average grain size, the grain distribution, and the grain shape of the feldspar particles and the quartz particles of the mixture.
  • average grain sizes, grain distribu ⁇ tions and grain shapes should be used for the two elements of the mixture.
  • the average grain size, the grain distribution, and the grain shape are parameters which influence the quality of the produced moulding sand.
  • a smaller proportion of feldspar should be used, that with increasing grain distribution a larger proportion of feldspar should be used, and that with more round grains a larger proportion of feldspar should be used.
  • the amount of feldspar used should be kept within the above-mentioned limits.
  • the moulding sand according to the invention may be used by itself. In certain instances, however, it may be desirable to use the produced mixture together with prior art moulding sand. Through the use of the moulding sand according to the invention, a considerably easier hand ⁇ ling of moulds is obtained than through the use of chromite sand a- lone. Furthermore, the consumption of sand will be reduced drastically since the moulding sand according to the invention has a volume per weight unit which is 3 times as big as the volume per weight unit of chromite sand.
  • the moulding sand according to the invention is used primarily as core sand. In a subsequent emptying of moulds containing moulding sand, e.g. quartz sand, the moulding sand according to the invention (the core sand) will be mixed with the sand for the mould. This mixture may be used again as sand for the mould without any negative influence on the sand for the mould.
  • the moulding sand according to the invention is particularly suitable as moulding sand for casting items in cast iron and non-ferrous metals where no problems will arise due to a lowering of the sintering point, which feldspar will bring about.
  • the moulding sand according to the invention is characteristic in having been produced from mainly pure quartz particles which have been mixed with free and mainly pure feld ⁇ spar particles.
  • the content of free feldspar particles in the moulding sand is preferably from 5 to 20 per cent by weight, and especially from 8 to 15 per cent by weight.
  • the cold-box method may be used together with moulding sand according to the present in ⁇ vention.
  • the invention also relates to the use of a mixture con ⁇ sisting of 80-95 per cent by weight of mainly pure quartz particles and 5-20 per cent by weight of mainly pure feldspar particles as moulding sand, primarily for cores, in castings according to the cold-box method.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

Sable de fonderie obtenu à partir de particules libres de quartz pratiquement pur mélangées à des particules libres et pratiquement pures de feldspath à raison de 5 à 20 % en poids, et convenant à la production de pièces en fonte ne devant pas comporter de nervures. La quantité de particules libres de feldspath créent un tampon qui permet la dilatation des particules de quartz sans aucun risque de formation de craquelures dans le sable. De plus, le sable ainsi produit présente une bonne capacité d'agglomération, ce qui supprime les risques de rupture des bords des moules ou des noyaux lors de l'attaque de coulée.
PCT/DK1993/000163 1993-05-14 1993-05-14 Sable de fonderie, son procede de production et ses applications Ceased WO1994026438A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU43086/93A AU4308693A (en) 1993-05-14 1993-05-14 Method and manufacturing of moulding sand, such moulding sand and application thereof
PCT/DK1993/000163 WO1994026438A1 (fr) 1993-05-14 1993-05-14 Sable de fonderie, son procede de production et ses applications

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK1993/000163 WO1994026438A1 (fr) 1993-05-14 1993-05-14 Sable de fonderie, son procede de production et ses applications

Publications (1)

Publication Number Publication Date
WO1994026438A1 true WO1994026438A1 (fr) 1994-11-24

Family

ID=8154206

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1993/000163 Ceased WO1994026438A1 (fr) 1993-05-14 1993-05-14 Sable de fonderie, son procede de production et ses applications

Country Status (2)

Country Link
AU (1) AU4308693A (fr)
WO (1) WO1994026438A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003013760A3 (fr) * 2001-08-07 2003-10-23 Noram Technology Ltd Produits de fabrication de moules et de noyaux utilises pour le coulage de metaux, et leur procedee fabrication et de recyclage a partir de roche concassee

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1529203A (en) * 1923-03-01 1925-03-10 American Cast Iron Pipe Co Composition of matter for molds
US2333430A (en) * 1939-05-31 1943-11-02 Dentists Supply Co Dental investment material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1529203A (en) * 1923-03-01 1925-03-10 American Cast Iron Pipe Co Composition of matter for molds
US2333430A (en) * 1939-05-31 1943-11-02 Dentists Supply Co Dental investment material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DIALOG INFORMATION SERVICES, File 351, World Patent Index 81-93, Dialog Accession No. 003946749, WPI Accession No. 84-092293/15, ASAHI CHEMICAL IND KK: "Ceramic Compsn. Which can be Calcined at Lower Temps. Without Cracking Comprises Cement, Feldspar Mineral and Powdered Refractories; & JP,A,59 039 759, 840305, *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003013760A3 (fr) * 2001-08-07 2003-10-23 Noram Technology Ltd Produits de fabrication de moules et de noyaux utilises pour le coulage de metaux, et leur procedee fabrication et de recyclage a partir de roche concassee
US6691765B2 (en) 2001-08-07 2004-02-17 Noram Technology, Ltd. Products for the manufacture of molds and cores used in metal casting and a method for their manufacture and recycle from crushed rock

Also Published As

Publication number Publication date
AU4308693A (en) 1994-12-12

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