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EP0032596B1 - Procédé pour fabriquer des moules perdus - Google Patents

Procédé pour fabriquer des moules perdus Download PDF

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Publication number
EP0032596B1
EP0032596B1 EP80200997A EP80200997A EP0032596B1 EP 0032596 B1 EP0032596 B1 EP 0032596B1 EP 80200997 A EP80200997 A EP 80200997A EP 80200997 A EP80200997 A EP 80200997A EP 0032596 B1 EP0032596 B1 EP 0032596B1
Authority
EP
European Patent Office
Prior art keywords
weight
percent
molds
phenolic
binder
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.)
Expired
Application number
EP80200997A
Other languages
German (de)
English (en)
Other versions
EP0032596A1 (fr
Inventor
Karl-Friedrich Heimbach
Dieter Schauerte
Alois Kwasniok
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.)
Rain Carbon Germany GmbH
Original Assignee
Ruetgerswerke AG
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 Ruetgerswerke AG filed Critical Ruetgerswerke AG
Publication of EP0032596A1 publication Critical patent/EP0032596A1/fr
Application granted granted Critical
Publication of EP0032596B1 publication Critical patent/EP0032596B1/fr
Expired 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
    • B22C1/167—Mixtures of inorganic and organic binding agents
    • 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 invention relates to a method for producing lost molds according to the preamble of claim 1. Such a method is known from DE-B 13 02 716.
  • Aqueous solutions of sodium or potassium silicates are often used as cold-curing binders for basic molding materials for lost molds.
  • decay-promoting additives such as. B. coal dust, wood flour, starch, sugar derivatives added. It is also known to add urea, melanin, phenol, furfuryl alcohol or furfuryl alcohol-urea-formaldehyde condensates, which in turn are combined with other resinous substances such as ketone formaldehyde resins, hydrocarbon resins, rosin, tall resins and the like. a. can be modified to support the tendency to decay.
  • these prior art additives are inadequate, especially when these binders are used to make intricately shaped and narrow passage molds.
  • isocyanates used as binders are cured by gassing with amines. These amines have hygroscopic properties and are highly toxic.
  • the object is achieved by processes for the production of lost molds from a molding material mixture of sand or other molding raw materials and by gassing with carbon dioxide-curable binders based on alkali silicates and 0.3-3 percent by weight of phenolic or furan resins, and optionally additives known per se, such as silanes, polyhydric alcohols and polysaccharides, the molding material mixture being introduced into molds and hardened, characterized in that the phenolic or furan resin has 0.1-1.5 percent by weight of a dry substance and the alkali silicate is 2-5 percent by weight.
  • Quartz sand is preferably used as the basic molding material.
  • other conventional molding materials such as chromite, zircon or olivine sand, chamotte, magnesite, sillimanite or corundum.
  • Phenolic or furan resins are preferably used as condensation resins.
  • 0.1-1.5% by weight of a dry substance is added to the condensation resin.
  • small amounts (0.1-0.5%) of an aminosilane are sometimes added.
  • dry matter is understood to mean metal soaps soluble in organic solvents, the main metals being Co, Mn and. Pb come into consideration, while as the organic component mostly carboxylic acid residues are present, such as. As naphthenates, octoates, linoleates, resinates or caprylates. These dry substances transfer the atmospheric oxygen through continuous regeneration, so that only small amounts of these substances are needed.
  • This binder is mixed thoroughly with the basic molding material. Then 2-5% by weight of alkali silicate is added as the second binder component and mixed.
  • An alkali silicate is an aqueous solution of sodium or potassium silicate which is commercially available under the name of water glass and in which 0.2-3% by weight of lithium hydroxide or a hydroxide of an alkaline earth metal have been dissolved.
  • This solution can additionally be admixed with substances known to promote disintegration, such as glycerin, starch, sugar derivatives or cellulose.
  • the mixture produced by thoroughly mixing the basic molding material with the two binder components is introduced into molds and hardened by gassing with carbon dioxide.
  • the strength of which already decreases considerably after storage for several days the strength of the shaped articles produced by the process according to the invention increases over the course of the storage time. Nevertheless, the decay after the casting is significantly improved.
  • Binder consisting of:
  • Binder consisting of:
  • Binder consisting of:
  • Binder consisting of:
  • a pure cobalt octoate e.g. octa-solingen cobalt
  • Molding material mixtures were produced with the binders of Comparative Examples 1-3 and Inventive Examples 4-7. 3 or 4 parts by weight of binder were used per 100 parts by weight of quartz sand (e.g. AFS 55). In the case of Examples 2-7, the sand was only 2 min. mixed with component I and then with component 11. Cylindrical test specimens (50 x 50 mm) were rammed from the mixtures. The cores were precured by gassing with CO 2 for 6-10 s. The shear strength was measured after 10 min. as well as 1, 5, 24, 48 and 72 hours, moisture absorption after 8 weeks and decay at 500 and 1000 ° C.
  • quartz sand e.g. AFS 55

Landscapes

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

Claims (3)

1. Procédé pour la fabrication de moules perdus à partir d'un mélange de matières pour moules à base de sable ou d'autres matières premières pour moules, et de liants pouvant durcir par gazage au dioxyde de carbone, à base de silicates de métaux alcalins et de 0,3 à 3 % en poids de résines phénoliques ou furanniques, ainsi que, éventuellement, d'additifs connus, comme des silanes, des polyols et des polysaccharides, le mélange de matières pour moules étant introduit et durci dans des moules, procédé caractérisé en ce que la résine phénolique ou furannique contient de 0,1 à 1,5 % en poids d'un dessiccant, et le silicate de métal alcalin représente de 2 à 5 % en poids.
2. Procédé pour la fabrication de moules perdus selon la revendication 1, caractérisé en ce que le silicate de métal alcalin contient, en tant qu'additif, de 0,2 à 3% en poids d'un hydroxyde de métal alcalino-terreux ou d'hydroxyde de lithium.
3. Utilisation des moules perdus selon l'une des revendications 1 et 2 pour fabriquer des moules et noyaux de fonderie.
EP80200997A 1980-01-22 1980-10-21 Procédé pour fabriquer des moules perdus Expired EP0032596B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3002113 1980-01-22
DE19803002113 DE3002113A1 (de) 1980-01-22 1980-01-22 Verfahren zur herstellung von verlorenen formen

Publications (2)

Publication Number Publication Date
EP0032596A1 EP0032596A1 (fr) 1981-07-29
EP0032596B1 true EP0032596B1 (fr) 1983-02-16

Family

ID=6092618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200997A Expired EP0032596B1 (fr) 1980-01-22 1980-10-21 Procédé pour fabriquer des moules perdus

Country Status (2)

Country Link
EP (1) EP0032596B1 (fr)
DE (2) DE3002113A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814357A1 (de) * 1977-04-04 1978-10-19 Hitachi Ltd Bindemittel fuer gussformen
DE2842114A1 (de) * 1977-09-28 1979-03-29 Hitachi Ltd Formbindemittel
DE2733874B2 (de) * 1976-07-28 1979-06-13 Hitachi, Ltd, Tokio Selbsthärtende wasserzersetzliche Form und Verfahren zu ihrer Herstellung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1302716B (fr) * 1963-03-20 1970-10-22

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2733874B2 (de) * 1976-07-28 1979-06-13 Hitachi, Ltd, Tokio Selbsthärtende wasserzersetzliche Form und Verfahren zu ihrer Herstellung
DE2814357A1 (de) * 1977-04-04 1978-10-19 Hitachi Ltd Bindemittel fuer gussformen
DE2842114A1 (de) * 1977-09-28 1979-03-29 Hitachi Ltd Formbindemittel

Also Published As

Publication number Publication date
EP0032596A1 (fr) 1981-07-29
DE3062062D1 (en) 1983-03-24
DE3002113A1 (de) 1981-07-30

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