EP1198310A1 - Matiere a mouler pour noyaux d'etranglement destines a de la fonte nodulaire - Google Patents

Matiere a mouler pour noyaux d'etranglement destines a de la fonte nodulaire

Info

Publication number
EP1198310A1
EP1198310A1 EP00929545A EP00929545A EP1198310A1 EP 1198310 A1 EP1198310 A1 EP 1198310A1 EP 00929545 A EP00929545 A EP 00929545A EP 00929545 A EP00929545 A EP 00929545A EP 1198310 A1 EP1198310 A1 EP 1198310A1
Authority
EP
European Patent Office
Prior art keywords
molding material
spheroidal
magnesium
additive
spheroidal graphite
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.)
Withdrawn
Application number
EP00929545A
Other languages
German (de)
English (en)
Inventor
Clemens Schottek
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.)
AS Luengen GmbH and Co KG
Original Assignee
AS Luengen GmbH and Co KG
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 AS Luengen GmbH and Co KG filed Critical AS Luengen GmbH and Co KG
Publication of EP1198310A1 publication Critical patent/EP1198310A1/fr
Withdrawn legal-status Critical Current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
    • B22C1/02—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

Definitions

  • the invention relates to a molding material for crushing cores for spheroidal iron.
  • Crushing cores are used in foundry technology as intermediate pieces between a feeder and a casting. They contain a "narrow point" at which the iron located between the feeder and the casting can be broken off.
  • Spheroidal graphite cast iron has several advantages over flake graphite cast iron, e.g. higher strength and better plastic deformability.
  • the minimum tensile strength of spheroidal graphite cast iron for predominantly ferritic or pearlitic basic structures is over 400 to 800 N / mm ⁇ instead of 100 or 400 N / mrt.2 for cast iron with lamellar graphite, and the minimum elongation at break is 15 or 2% instead an elongation at break of less than 1% (cf. Ulimann's Encyclopedia of Industrial Chemistry, 4th edition, Vol. 12 (1976), pp. 423-424).
  • the cast iron solidified in the "crushing cores" did not contain spheroidal graphite, but only lamellar graphite, even if the molten iron contained small amounts of spheroidal additives.
  • the flake graphite cast iron even extended into the area of the casting because the molten iron migrated from the feeder into the casting as a result of the volume contraction.
  • the invention thus relates to a molding material for crushing cores for spheroidal cast iron, comprising a refractory granular base material and a binder.
  • the molding material is characterized by a content of a finely divided spheroidal additive.
  • the preferred spheroidal additive is finely divided magnesium, although other spheroidal additives, such as cerium, which have hitherto only been added to iron, can also be used.
  • the result that can be achieved with the aid of the invention is surprising because the spheroidal additive contained in the molding material does not come into direct contact with the molten iron and therefore no interaction between the additive and the molten iron was to be expected.
  • a reaction of the spheroidal additive contained in the molding material with the molten iron in the vapor phase can be regarded as excluded, since the magnesium and even more the cerium has an extremely low vapor pressure and the molding material contains air inclusions between the grains of the fine-grained mineral, so that the vaporous spheroid Additive would react immediately with the atmospheric oxygen.
  • the molding material contains approximately 1 to 3% by weight of finely divided magnesium.
  • the finely divided magnesium preferably has a particle size of approximately 0.063 to 2 mm.
  • the refractory granular base material is usually classified quartz sand. Chromite, zircon and olivine sand can also be used. Raw materials based on chamotte, as well as .Magnesite, Sillimanite and corundum can also be used.
  • the binders for the refractory granular base material can be inorganic or organic in nature.
  • the inorganic binders are divided into natural and synthetic.
  • Natural inorganic binders are clays (montmorillonite, glauconite, kaolinite, illite, attapulgite);
  • Synthetic inorganic binders are, for example, water glass, cement and plaster.
  • the organic binders primarily include synthetic resins, e.g. Phenolic, urea and furan resins as well as ethyl silicate.
  • oils, carbohydrate binders, water-soluble liquid binders based on sulfite leaching, molasses, dextrose processes, alkanolamines and pitch binders can also be used.
  • the refractory granular base e.g. Quartz sand, coated with a resin.
  • This sand is called croning sand.
  • Such sand is blown into the hollow form of the crushing core with the aid of a core shooter and fills the cavity there.
  • the mold is cured at 200 to 300 ° C, whereby the resin becomes liquid and binds the sand particles together.
  • the phenolic resin hardens in the heat so that it cannot be melted afterwards.
  • sands can also be used in the crusher core.
  • a so-called cold box mass can be used which contains water glass as a binder. The coldbox mass is cured by blowing in carbon dioxide and then drying.
  • a compound of 92 parts by weight of quartz sand (F 32, manufacturer: Quarzwerke Frechem) and 5 parts by weight of croning resin (a phenolic resin) is mixed with 3 parts by weight of magnesium (particle size 0.1 mm). The mixture is filled into a crusher mold and cured at 240 ° C for 2 minutes.
  • the crusher core is glued to a feeder and placed on a cast model. After the casting model has been removed, the cooled casting mold is filled with molten nodular cast iron (about 3.4% C, 0.05% Mg) and allowed to solidify.
  • the solidified sphere roguß shows spheroidal graphite in the cut both in the casting and in the crushing core area.
  • a mixture of 90 parts by weight of quartz sand, 7 parts by weight of water glass (50% solids content) and 3 parts by weight of magnesium is filled into a crusher core, hardened by gassing with CO2 at room temperature, and at 180 ° C. to constant weight dried.
  • the further treatment steps are carried out as in Example 1.
  • the solidified nodular cast iron shows spheroidal graphite both in the casting and in the crushing core area.
  • Example 1 The procedure of Example 1 is repeated with the difference that no magnesium is added.
  • the cut in the border area between the crusher core and the casting shows a mixture of spheroidal and lamellar graphite (degenerate graphite) right into the casting.

Landscapes

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

Abstract

L'invention concerne une matière à mouler pour noyaux d'étranglement destinés à de la fonte nodulaire, contenant une matière de base minérale, granuleuse et résistant au feu, ainsi qu'un liant. Cette matière à mouler est caractérisée en ce qu'elle contient un additif à grains fins, formant des sphéroïdes, constitué de préférence par du magnésium.
EP00929545A 1999-05-22 2000-05-20 Matiere a mouler pour noyaux d'etranglement destines a de la fonte nodulaire Withdrawn EP1198310A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19923779 1999-05-22
DE1999123779 DE19923779A1 (de) 1999-05-22 1999-05-22 Formstoff für Brechkerne für den Sphäroguß
PCT/EP2000/004598 WO2000071281A1 (fr) 1999-05-22 2000-05-20 Matiere a mouler pour noyaux d'etranglement destines a de la fonte nodulaire

Publications (1)

Publication Number Publication Date
EP1198310A1 true EP1198310A1 (fr) 2002-04-24

Family

ID=7909035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00929545A Withdrawn EP1198310A1 (fr) 1999-05-22 2000-05-20 Matiere a mouler pour noyaux d'etranglement destines a de la fonte nodulaire

Country Status (3)

Country Link
EP (1) EP1198310A1 (fr)
DE (1) DE19923779A1 (fr)
WO (1) WO2000071281A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10209224A1 (de) * 2002-03-04 2003-10-09 Vaw Mandl & Berger Gmbh Linz Verfahren zum Herstellen von Gußstücken
DE10209183A1 (de) * 2002-03-04 2003-10-02 Vaw Mandl & Berger Gmbh Linz Formstoff für die Herstellung von Gießformteilen
DE102004042535B4 (de) * 2004-09-02 2019-05-29 Ask Chemicals Gmbh Formstoffmischung zur Herstellung von Gießformen für die Metallverarbeitung, Verfahren und Verwendung
CN105665615B (zh) * 2016-02-05 2018-10-02 济南圣泉集团股份有限公司 一种铸造水玻璃用固化剂及其制备方法和用途

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2532745C2 (de) * 1975-07-22 1985-09-26 Chemineon Inc.,, Southfield, Mich. Wärmeisolierende Auskleidung für Speiser
CA1070474A (fr) * 1975-08-22 1980-01-29 Prem P. Mohla Catalyseur pour la fonte nodulaire et mode de fabrication connexe
DE7916621U1 (de) * 1979-06-08 1981-07-09 Foseco Gesellschaft für chemischmetallurgische Erzeugnisse mbH, 4280 Borken Vorrichtung zur verwendung bei der herstellung von giessformen mit speisern
JPS63174752A (ja) * 1987-01-14 1988-07-19 Sadaji Nagabori 無塗型鋳造に適した鋳物用砂型または中子の連続式製造方法および製造装置
US4775704A (en) * 1987-04-22 1988-10-04 Teiji Nagahori Mold material for forming sandmold without requiring mold wash
EP0410603A1 (fr) * 1989-07-26 1991-01-30 Foseco International Limited Coulée de la fonte liquide et filtres utilisés
US4989662A (en) * 1990-02-27 1991-02-05 General Motors Corporation Differential pressure, countergravity casting of a melt with a fugative alloyant
US5161604A (en) * 1992-03-26 1992-11-10 General Motors Corporation Differential pressure, countergravity casting with alloyant reaction chamber
JP3239209B2 (ja) * 1997-05-22 2001-12-17 正光 三木 鋳物用発熱体の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0071281A1 *

Also Published As

Publication number Publication date
DE19923779A1 (de) 2000-11-23
WO2000071281A1 (fr) 2000-11-30

Similar Documents

Publication Publication Date Title
DE102004042535B4 (de) Formstoffmischung zur Herstellung von Gießformen für die Metallverarbeitung, Verfahren und Verwendung
DE69917172T2 (de) Exothermer Körper für Giessereizwecke
EP0084689B1 (fr) Procédé de fabrication d'un noyau ou moule de fonderie
EP1198310A1 (fr) Matiere a mouler pour noyaux d'etranglement destines a de la fonte nodulaire
US4396431A (en) Process for preparing olivine sand cores and molds
DE3020089C2 (de) Formmasse für Gießereikerne und -formen und ihre Verwendung
US4423764A (en) Binder for preparing improved cores and molds
US4422496A (en) Process for preparing olivine sand cores and molds
US4383861A (en) Metal silico-phosphate binders and foundry shapes produced therefrom
KR900016361A (ko) 에스테르 경화제, 이를 함유하는 결합제 및 이를 함유하는 주물용 성형 조성물
AT389249B (de) Zusatz zum regulieren der nach dem giessen zurueckbleibenden festigkeit von wasserglasgebundenen gussformen und/oder kernen
US4464492A (en) Foundry binder
DE2630832A1 (de) Verfahren zur herstellung von gussbloecken aus geschmolzenem metall
DE3049174C2 (de) Kalthärtende Formmasse zur Vermeidung der Bildung von Blattrippen
DE10065270A1 (de) Speiser und Zusammensetzungen zu deren Herstellung
SU1477506A1 (ru) Холоднотвердеюща смесь дл изготовлени литейных форм и стержней при производстве отливок преимущественно из магниевых сплавов
US4396725A (en) Process for preparing olivine sand cores and molds
US4522799A (en) Process for preparing olivine sand cores and molds
DE2518485B2 (de) Verfahren zur herstellung eines fluessigen bindemittels fuer giessereiform und -kernmassen
DE2401185A1 (de) Bindemittel
RU2094162C1 (ru) Самотвердеющая смесь для изготовления литейных форм и стержней
DE3424970C2 (fr)
EP0032596B1 (fr) Procédé pour fabriquer des moules perdus
AT350201B (de) Isolierkoerper fuer kokillenkopf- bzw. blockkopfauskleidungen
US4465116A (en) Process for preparing sand cores and molds

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20011107

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20030115