EP0917499B1 - Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke - Google Patents

Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke Download PDF

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Publication number
EP0917499B1
EP0917499B1 EP97934549A EP97934549A EP0917499B1 EP 0917499 B1 EP0917499 B1 EP 0917499B1 EP 97934549 A EP97934549 A EP 97934549A EP 97934549 A EP97934549 A EP 97934549A EP 0917499 B1 EP0917499 B1 EP 0917499B1
Authority
EP
European Patent Office
Prior art keywords
core
sand
core box
bonding agent
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.)
Expired - Lifetime
Application number
EP97934549A
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German (de)
English (en)
French (fr)
Other versions
EP0917499A2 (de
Inventor
Thomas Steinhäuser
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.)
Vaw Aluminium AG
Original Assignee
Vereinigte Aluminium Werke AG
Vaw Aluminium 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 Vereinigte Aluminium Werke AG, Vaw Aluminium AG filed Critical Vereinigte Aluminium Werke AG
Publication of EP0917499A2 publication Critical patent/EP0917499A2/de
Application granted granted Critical
Publication of EP0917499B1 publication Critical patent/EP0917499B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • the invention relates to a method for producing core moldings for foundry technology, whereby a mixture of an inorganic, fireproof molding sand and an inorganic Binder made of water glass, which The mixture is poured into a tempered core box, which is in the Water contained in the mixture is physically extracted and the core preform is removed from the core box and a Process for the production of circulating core sand.
  • test samples consisted of a compressed sand-sodium silicate mixture.
  • a vacuum was applied in the Range of 0.5 to 3 mm Hg applied and held as long as up to 10 to 30% of the moisture could be removed from the binder.
  • the only non-organic binder material mentioned in the article by Cole is a sodium silicate binder, which, however, is either mixed with complex ester hardeners or is subjected to a "chemical drying process" using "conventional” CO 2 gassing systems.
  • ester compounds are not recommended because of the environmental problems mentioned above.
  • WO-A-86/00033 describes a process for the production of Core moldings known in the form of sand with water glass as Binder is mixed. The mixture is placed in the core box Exposure to microwave water. There is the Core box made of a material permeable to microwaves, e.g. Plastic, rubber or a multi-layer non-metallic Material.
  • the object of the present invention is now a method develop for the production of core moldings for foundry purposes, that does not have the disadvantages described above. This object is achieved by the in claim 1 specified features solved.
  • the new process is intended to produce complex shaped large series parts in an environmentally friendly, energy-efficient production method are produced in particular as large-volume core moldings can have a sufficient bending strength for handling and a "smooth" compared to previous core sand surfaces Surface and the complete waiver of decay promoting Additives allowed.
  • reprocessing of the "old sand" is intended for any separation or splitting off from Z.
  • organic substances and wet chemical treatment the old sand can be dispensed with and still a circulating core sand can be produced with such physical properties, those with those of the natural raw material originally used are identical.
  • Figure 1 includes a representation comparison of different Molding binder systems under constantly defined conditions.
  • the mold storage time is designated 0 minutes, d. H. the molding material becomes molded articles immediately after mixing processed.
  • the core storage time is 60 minutes, d. H. the molded part is shaped according to the given shape Time stored and then broken.
  • the product according to the invention was produced in a rocking mixer with a mixing time of 50 seconds from 5 kg of molding sand H32 with 2.5% binder and processed on a core shooter of the H 2.5 type, the molding sand in a temperature-controlled core box being exposed to a negative pressure during the filling .
  • the tool temperature was 150 ° C.
  • the compression took place at 2.5 bar overpressure.
  • the resulting gases were extracted with a flow rate of 4 m 3 / h (corresponding to a vacuum of 0.6 bar) before the mold was opened.
  • the core molding was dried in the microwave (600 watts) for 120 seconds.
  • FIG. 1 shows the associated bending strengths with a thinly hatched column with a molding material storage time of 0 min and a core storage time of 60 min.
  • a comparative product was produced using the resol-CO 2 process and with 2.7% binder type.
  • the mixing time was 70 seconds, the compression was carried out under negative pressure at -0.8 bar.
  • the comparison product was then cured in a CO 2 atmosphere at 1 bar for 8.5 seconds.
  • the results are compared in FIG. 1 as a "CO 2 " column with the same molding material storage times of 0 and core storage times of 60 minutes compared to the data according to the invention.
  • CB1, CB2, CB3 Cold Box
  • 0.8 / 0.8% DMEA 0.8 / 0.8% DMEA
  • SO 2 -gassed sand system with 1% EPOXY / 0.25% resin and oxidizer has been manufactured and tested.
  • the bending strengths of the core moldings according to the invention have significantly better values than the SO 2 and CO 2 hardened moldings if the cores are removed from the mold immediately without storage.
  • Figure 5 is the representation of Figure 4 by different Mold storage times added. No figure shows the comparison of regenerates at different core storage times because the Comparative method a stability of the moldings only after removal allow the organic components.
  • the gas volume is displayed system-adjusted, ie the dead volume is taken into account by calculation.
  • Test duration 7.5 minutes under thermal stress.
  • the sand systems were manufactured on the basis of H 32 new sand. For a separate comparison, a sample of unpolluted H 32 new sand was inserted for comparison.

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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)
EP97934549A 1996-08-09 1997-07-26 Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke Expired - Lifetime EP0917499B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19632293 1996-08-09
DE19632293A DE19632293C2 (de) 1996-08-09 1996-08-09 Verfahren zur Herstellung von Kernformlingen für die Gießereitechnik
PCT/EP1997/004072 WO1998006522A2 (de) 1996-08-09 1997-07-26 Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke

Publications (2)

Publication Number Publication Date
EP0917499A2 EP0917499A2 (de) 1999-05-26
EP0917499B1 true EP0917499B1 (de) 2000-11-22

Family

ID=7802305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97934549A Expired - Lifetime EP0917499B1 (de) 1996-08-09 1997-07-26 Verfahren zur herstellung von kernformlingen und umlaufkernsand für giessereizwecke

Country Status (7)

Country Link
EP (1) EP0917499B1 (da)
AT (1) ATE197683T1 (da)
DE (2) DE19632293C2 (da)
DK (1) DK0917499T3 (da)
ES (1) ES2153677T3 (da)
HU (1) HU222658B1 (da)
WO (1) WO1998006522A2 (da)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10144391C1 (de) * 2001-09-10 2002-10-17 Vaw Mandl & Berger Gmbh Linz Verfahren und Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze
DE10144193C1 (de) * 2001-09-08 2002-10-31 Vaw Mandl & Berger Gmbh Linz Verfahren und Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze
DE10209183A1 (de) * 2002-03-04 2003-10-02 Vaw Mandl & Berger Gmbh Linz Formstoff für die Herstellung von Gießformteilen
DE10209224A1 (de) * 2002-03-04 2003-10-09 Vaw Mandl & Berger Gmbh Linz Verfahren zum Herstellen von Gußstücken
WO2010025861A1 (de) * 2008-09-05 2010-03-11 Minelco Gmbh Mit wasserglas beschichteter und/oder vermischter kern- oder formsand mit einem wassergehalt im bereich von≥etwa 0,25 gew.-% bis etwa 0,9 gew.-%
US10232430B2 (en) 2007-10-30 2019-03-19 Ask Chemicals Gmbh Mould material mixture having improved flowability

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29925010U1 (de) * 1999-10-26 2008-09-04 Mincelco Gmbh Wasserglasgebundener Kernformstoff
WO2003013761A1 (de) * 2001-08-10 2003-02-20 Dipl.-Ing. Laempe Gmbh Verfahren und vorrichtung zur herstellung von formen oder kernen für giessereizwecke
DE10200927A1 (de) * 2001-08-10 2003-03-06 Laempe Joachim Verfahren und Vorrichtung zur Herstellung von Formen oder Kernen für Giessereizwecke
MXPA04002424A (es) * 2001-09-14 2005-04-11 Hydro Aluminium Deutschland Metodo para la fabricacion de piezas fundidas, arena de moldeo y su uso para la implementacion del metodo.
DE10216464B4 (de) * 2002-04-12 2004-04-15 Deutsches Zentrum für Luft- und Raumfahrt e.V. Silica gebundene Kernwerkstoffe, Verfahren zu deren Herstellung und deren Verwendung
DE102004042535B4 (de) 2004-09-02 2019-05-29 Ask Chemicals Gmbh Formstoffmischung zur Herstellung von Gießformen für die Metallverarbeitung, Verfahren und Verwendung
DE102006003198A1 (de) * 2006-01-24 2007-07-26 Deutsches Zentrum für Luft- und Raumfahrt e.V. Kerne für den Leichtmetall- und/oder den Feinguss
DE102006061876A1 (de) 2006-12-28 2008-07-03 Ashland-Südchemie-Kernfest GmbH Kohlenhydrathaltige Formstoffmischung
CA2666760C (en) 2006-10-19 2014-10-28 Jens Mueller Molding material mixture containing carbohydrates
DE102006049379A1 (de) 2006-10-19 2008-04-24 Ashland-Südchemie-Kernfest GmbH Phosphorhaltige Formstoffmischung zur Herstellung von Giessformen für die Metallverarbeitung
DE102008041217A1 (de) * 2008-08-13 2010-02-18 Volkswagen Ag Formstoffbinder für schüttbare Formmassen und Verfahren zum Herstellen von Kerneinsätzen für Gussformen
EP2537926A1 (en) 2011-06-21 2012-12-26 Isobionics B.V. Valencene synthase
DE102015106126A1 (de) 2015-04-21 2016-10-27 Nemak, S.A.B. De C.V. Kernkasten zum Herstellen von Gießkernen
RU2763701C1 (ru) * 2021-06-22 2021-12-30 федеральное государственное бюджетное образовательное учреждение высшего образования "Нижегородский государственный технический университет им. Р.Е. Алексеева" (НГТУ) Способ изготовления литейных стержней и форм

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB952788A (en) * 1962-02-15 1964-03-18 Foseco Int Moulds, cores and the like suitable for foundry and like purposes
US4226277A (en) * 1978-06-29 1980-10-07 Ralph Matalon Novel method of making foundry molds and adhesively bonded composites
WO1986000033A1 (en) * 1984-06-12 1986-01-03 MIKROVA^oGSAPPLIKATION AB A method and a plant of manufacturing cores
JPS6167539A (ja) * 1984-09-12 1986-04-07 Mitsubishi Heavy Ind Ltd 塗型材の乾燥方法
NL8820936A (nl) * 1987-12-08 1990-10-01 Harri Sahari Werkwijze voor het vervaardigen van vormen en kernen, gebruikt bij het gieten van metalen.
JPH01215433A (ja) * 1988-02-19 1989-08-29 Mitsubishi Motors Corp 高圧鋳造用中子の製造方法
US4960162A (en) * 1989-02-17 1990-10-02 Esco Corporation Method of reclaiming foundry sand

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10144193C1 (de) * 2001-09-08 2002-10-31 Vaw Mandl & Berger Gmbh Linz Verfahren und Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze
DE10144391C1 (de) * 2001-09-10 2002-10-17 Vaw Mandl & Berger Gmbh Linz Verfahren und Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze
DE10209183A1 (de) * 2002-03-04 2003-10-02 Vaw Mandl & Berger Gmbh Linz Formstoff für die Herstellung von Gießformteilen
DE10209224A1 (de) * 2002-03-04 2003-10-09 Vaw Mandl & Berger Gmbh Linz Verfahren zum Herstellen von Gußstücken
US10232430B2 (en) 2007-10-30 2019-03-19 Ask Chemicals Gmbh Mould material mixture having improved flowability
WO2010025861A1 (de) * 2008-09-05 2010-03-11 Minelco Gmbh Mit wasserglas beschichteter und/oder vermischter kern- oder formsand mit einem wassergehalt im bereich von≥etwa 0,25 gew.-% bis etwa 0,9 gew.-%
EP2163328A1 (de) * 2008-09-05 2010-03-17 Minelco GmbH Mit Wasserglas beschichteter und/oder vermischter Kern- oder Formsand mit einem Wassergehalt im Bereich von >= etwa 0,25 Gew.-% bis etwa 0,9 Gew.-%

Also Published As

Publication number Publication date
EP0917499A2 (de) 1999-05-26
HUP0001766A3 (en) 2000-11-28
DE19632293A1 (de) 1998-02-19
DK0917499T3 (da) 2001-02-12
DE59702665D1 (de) 2000-12-28
ATE197683T1 (de) 2000-12-15
DE19632293C2 (de) 1999-06-10
HUP0001766A2 (hu) 2000-09-28
ES2153677T3 (es) 2001-03-01
HU222658B1 (hu) 2003-09-29
WO1998006522A2 (de) 1998-02-19
WO1998006522A3 (de) 1998-06-04

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