WO1998017417A1 - Method for producing moulding sand for foundry purposes - Google Patents

Method for producing moulding sand for foundry purposes Download PDF

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Publication number
WO1998017417A1
WO1998017417A1 PCT/EP1997/005440 EP9705440W WO9817417A1 WO 1998017417 A1 WO1998017417 A1 WO 1998017417A1 EP 9705440 W EP9705440 W EP 9705440W WO 9817417 A1 WO9817417 A1 WO 9817417A1
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WIPO (PCT)
Prior art keywords
weight
carbon
aqueous suspension
containing solids
molding sand
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Application number
PCT/EP1997/005440
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German (de)
French (fr)
Inventor
Cor Grefhorst
René ROELEVELD
Jan Roel Van Der Sluis
Original Assignee
Metallgesellschaft Aktiengesellschaft
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
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Application filed by Metallgesellschaft Aktiengesellschaft filed Critical Metallgesellschaft Aktiengesellschaft
Publication of WO1998017417A1 publication Critical patent/WO1998017417A1/en

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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
    • B22C1/02—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 process for producing a molding sand for foundry purposes, in which case a water-containing mixture is formed which consists of 40 to 90% by weight of quartz, 5 to 20% by weight of active binder clay, 2 to 8% by weight. % consists of water and at least 2% by weight of carbon-containing solids.
  • Shaped sands of this type are known and z. B. described in EP-A-0 549 547 and DE-A-24 19 229. Carbon-containing solids are introduced into the molding sand mixture so that shiny carbon forms on the metal surface during casting, which causes the metal surface to be smoothed.
  • the molding sand is mixed with fatty acids or fatty acid derivatives, and in the process of DE-A-24 19 229, polyurethane is added to the molding sand.
  • the invention has for its object to produce molding sand in a simple and inexpensive manner. In the process mentioned at the outset, this is achieved by introducing part or all of the newly added carbon-containing solids into the mixture by means of an aqueous suspension.
  • the molding sand mixture is usually conducted in a circulatory system.
  • the aqueous suspension expediently contains a suspending agent which prevents the solids from settling and at the same time has a dispersing action.
  • Coal dust can be used as carbon-containing solids; it is also possible to use solid hydrocarbons, e.g. B.
  • the suspension can also with other carbon-forming substances such as. B. vegetable oil or latex-based products.
  • suspending agent such as B. polysaccharides, bentonite, starch, starch derivatives or cellulose in question.
  • wetting agents or electrolytes can also be added to improve the dispersion of the solids.
  • the content of carbon-containing solids in the aqueous suspension is in the range from 20 to 80% by weight and mostly 40 to 60% by weight.
  • the suspending agents are usually added to the aqueous suspension at a content of 0.1 to 4% by weight. You can see the suspension with 0, 1 to Enrich 10% by weight bentonite, since bentonite also acts as a suspending agent.
  • the finished molding sand consists of 40 to 90% by weight of quartz, usually a considerable proportion of molding sand that has already been used is reused. With this old sand, it is not a problem that the grains have a shell made of burnt bentonite.
  • the finished molding sand also contains 5 to 20% by weight of active binder clay, usually in the form of bentonite. When the bentonite is burnt to death due to the high temperatures during the casting process, it no longer acts as an active binding clay. However, the reused used sand can easily contain 2 to 30% by weight of still-burned bentonite.
  • a first molding sand mixture I consists of the components specified below, suspension A being used.
  • suspension B is used:

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

Abstract

The moulding sand mixture consists of 40 to 90 wt % quartz, 5 to 20 wt % active binder clay, 2 to 8 wt % water and at least 2 wt % carbon-containing solid matter. The carbon-containing solid matter is added to the mixture totally or partially by means of an aqueous solution having carbon-containing solid matter. The aqueous solution contains preferably 20 to 80 wt % carbon-containing solid matter.

Description

Verfahren zum Herstellen eines Formsandes für Gießereizwecke Process for producing molding sand for foundry purposes
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zum Herstellen eines Formsandes für Gießereizwecke, wobei man ein wasserhaltiges Gemisch bildet, welches zu 40 bis 90 Gew.-% aus Quarz, zu 5 bis 20 Gew.-% aus aktivem Bindeton, zu 2 bis 8 Gew.-% aus Wasser und zu mindestens 2 Gew.-% aus kohlenstoffhaltigen Feststoffen besteht .The invention relates to a process for producing a molding sand for foundry purposes, in which case a water-containing mixture is formed which consists of 40 to 90% by weight of quartz, 5 to 20% by weight of active binder clay, 2 to 8% by weight. % consists of water and at least 2% by weight of carbon-containing solids.
Formsande dieser Art sind bekannt und z. B. in EP-A-0 549 547 und DE-A-24 19 229 beschrieben. Kohlenstoffhaltige Feststoffe werden hierbei in die Formsandmischung eingebracht, damit sich beim Gießen an der Metalloberfläche Glanzkohlenstoff bildet, welcher die Glättung der Metalloberfläche bewirkt . Gemäß EP-A-0 549 547 wird der Formsand mit Fettsäuren oder Fettsäure-Derivaten versetzt, und beim Verfahren der DE-A-24 19 229 mischt man dem Formsand Polyurethan zu. Der Erfindung liegt die Aufgabe zugrunde, Formsand auf einfache und kostengünstige Weise herzustellen. Beim eingangs genannten Verfahren gelingt dies dadurch, daß man einen Teil oder die gesamten neu zuzugebenden kohlenstoffhaltigen Feststoffe durch eine wäßrige Suspension in das Gemisch einbringt. Üblicherweise wird das Formsand-Gemisch in einem Kreislaufsystem geführt. Zweckmäßigerweise enthält die wäßrige Suspension ein Suspendiermittel, welches das Absetzen der Feststoffe verhindert und gleichzeitig dispergierend wirkt.Shaped sands of this type are known and z. B. described in EP-A-0 549 547 and DE-A-24 19 229. Carbon-containing solids are introduced into the molding sand mixture so that shiny carbon forms on the metal surface during casting, which causes the metal surface to be smoothed. According to EP-A-0 549 547, the molding sand is mixed with fatty acids or fatty acid derivatives, and in the process of DE-A-24 19 229, polyurethane is added to the molding sand. The invention has for its object to produce molding sand in a simple and inexpensive manner. In the process mentioned at the outset, this is achieved by introducing part or all of the newly added carbon-containing solids into the mixture by means of an aqueous suspension. The molding sand mixture is usually conducted in a circulatory system. The aqueous suspension expediently contains a suspending agent which prevents the solids from settling and at the same time has a dispersing action.
Als kohlenstoffhaltige Feststoffe kann man Kohlenstaub verwenden, möglich ist es auch, statt dessen oder zusammen mit Kohlenstaub feste Kohlenwasserstoffe, z. B.Coal dust can be used as carbon-containing solids; it is also possible to use solid hydrocarbons, e.g. B.
Kohlenwasserstoffharze, Naturasphalt, Pech oder Bitumen in die Suspension einzubringen. Die Suspension kann auch mit weiteren, Glanzkohlenstoff bildenden Substanzen wie z. B. pflanzlichem Öl oder Produkte auf Latexbasis, angereichert werden.Add hydrocarbon resins, natural asphalt, pitch or bitumen to the suspension. The suspension can also with other carbon-forming substances such as. B. vegetable oil or latex-based products.
Als Suspendiermittel kommen z. B. Polysaccharide, Bentonit, Stärke, Stärkederivate oder Cellulose infrage. Zusätzlich kann man neben dem Suspendiermittel zum verbesserten Dispergieren der Feststoffe noch Netzmittel oder Elektrolyte zugeben.As a suspending agent such. B. polysaccharides, bentonite, starch, starch derivatives or cellulose in question. In addition to the suspending agent, wetting agents or electrolytes can also be added to improve the dispersion of the solids.
Es ist zweckmäßig, die wäßrige Suspension separat herzustellen und bereitzuhalten. Der Gehalt an kohlenstoffhaltigen Feststoffen in der wäßrigen Suspension liegt im Bereich von 20 bis 80 Gew.-% und zumeist 40 bis 60 Gew.-%. Die Suspendiermittel gibt man üblicherweise mit einem Gehalt von 0,1 bis 4 Gew.-% in die wäßrige Suspension. Man kann die Suspension auch mit 0,1 bis 10 Gew.-% Bentonit anreichern, da Bentonit ebenfalls als Suspendiermittel wirkt .It is advisable to prepare and keep the aqueous suspension separately. The content of carbon-containing solids in the aqueous suspension is in the range from 20 to 80% by weight and mostly 40 to 60% by weight. The suspending agents are usually added to the aqueous suspension at a content of 0.1 to 4% by weight. You can see the suspension with 0, 1 to Enrich 10% by weight bentonite, since bentonite also acts as a suspending agent.
Es ist unproblematisch, die wäßrige Suspension herzustellen und über einen längeren Zeitraum zu lagern. Es sind hierfür keine besonderen Behälter nötig; die wäßrige Suspension stellt kein für die Umwelt gefährliches Produkt dar, und ferner kann die Suspension beim Herstellen des Formsandes leicht und genau dosiert werden.It is not a problem to prepare the aqueous suspension and to store it over a longer period of time. No special containers are required for this; the aqueous suspension is not a product which is dangerous for the environment, and furthermore the suspension can be metered easily and precisely when producing the molding sand.
Der fertige Formsand besteht zu 40 bis 90 Gew.-% aus Quarz, wobei man üblicherweise einen erheblichen Anteil an bereits gebrauchtem Formsand wiederverwendet . Bei diesem Altsand ist es nicht störend, daß die Körner eine Hülle aus totgebranntem Bentonit aufweisen. Der fertige Formsand enthält ferner 5 bis 20 Gew.-% aktiven Bindeton, üblicherweise in Form von Bentonit. Wenn der Bentonit durch die hohen Temperaturen beim Gießvorgang totgebrannt ist, wirkt er nicht mehr als aktiver Bindeton. Der wiederverwendete Altsand kann jedoch ohne weiteres 2 bis 30 Gew.-% an totgebranntem Bentonit enthalten.The finished molding sand consists of 40 to 90% by weight of quartz, usually a considerable proportion of molding sand that has already been used is reused. With this old sand, it is not a problem that the grains have a shell made of burnt bentonite. The finished molding sand also contains 5 to 20% by weight of active binder clay, usually in the form of bentonite. When the bentonite is burnt to death due to the high temperatures during the casting process, it no longer acts as an active binding clay. However, the reused used sand can easily contain 2 to 30% by weight of still-burned bentonite.
Beispiele:Examples:
Es werden zwei Varianten A und B der wäßrigen Suspension hergestellt, die folgende Zusammensetzungen haben: BTwo variants A and B of the aqueous suspension are produced, which have the following compositions: B
Kohlenstaub 30 Gew.-% 40 Gew.-% KohlenwasserstoffharzeCoal dust 30% by weight 40% by weight of hydrocarbon resins
(aliphatisch) 3 Gew.-% 5 Gew.-%(aliphatic) 3% by weight 5% by weight
Naturasphalt 10 Gew.-% 5 Gew.-%Natural asphalt 10% by weight 5% by weight
Cellulose 0,5 Gew.-% 1 Gew.-%Cellulose 0.5% by weight 1% by weight
Bentonit -- 1 Gew.-%Bentonite - 1% by weight
Wasser 56,5 Gew.-% 49 Gew.-%Water 56.5% by weight 49% by weight
Eine erste Formsandmischung I besteht aus den nachfolgend angegebenen Komponenten, wobei man die Suspension A einsetzt Beim Formsand II verwendet man die Suspension B:A first molding sand mixture I consists of the components specified below, suspension A being used. For molding sand II, suspension B is used:
IIII
Quarz 80 Gew.-% 79 Gew.-% aktiver Bindeton (Bentonit) 8 Gew.-% 7 Gew.-% totgebrannter Bindeton 5 Gew.-% 5 Gew.-%Quartz 80% by weight 79% by weight of active binder clay (bentonite) 8% by weight 7% by weight of still-burned binder clay 5% by weight 5% by weight
Kohlenstaub und Cellulose 2,5 Gew.-% 4 Gew.-%Coal dust and cellulose 2.5% by weight 4% by weight
Wasser 4 Gew.-% 4 Gew.-% Kohlenwasserstoffharze und Naturasphalt 0,5 Gew.-% 1 Gew.-% Water 4% by weight 4% by weight hydrocarbon resins and natural asphalt 0.5% by weight 1% by weight

Claims

Patentansprüche claims
1. Verfahren zum Herstellen eines Formsandes für Gießereizwecke, wobei man ein Gemisch bildet, welches zu 40 bis 90 Gew.-% aus Quarz, zu 5 bis 20 Gew.-% aus aktivem Bindeton, zu 2 bis1. A process for producing a molding sand for foundry purposes, wherein a mixture is formed which consists of 40 to 90 wt .-% of quartz, 5 to 20 wt .-% of active binder clay, 2 to
8 Gew.-% aus Wasser und zu mindestens 2 Gew.-% aus kohlenstoffhaltigen Feststoffen besteht, dadurch gekennzeichnet, daß man mindestens einen Teil der kohlenstoffhaltigen Feststoffe durch eine wäßrige Suspension in das Gemisch einbring- t, welche kohlenstoffhaltige Feststoffe enthält.8% by weight of water and at least 2% by weight of carbon-containing solids, characterized in that at least some of the carbon-containing solids are introduced into the mixture by an aqueous suspension which contains carbon-containing solids.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die wäßrige Suspension 20 bis 80 Gew.-% kohlenstoffhaltige Feststoffe enthält.2. The method according to claim 1, characterized in that the aqueous suspension contains 20 to 80 wt .-% carbon-containing solids.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die wäßrige Suspension 0,1 bis 10 Gew.-% Bentonit enthält.3. The method according to claim 1 or 2, characterized in that the aqueous suspension contains 0.1 to 10 wt .-% bentonite.
4. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die wäßrige Suspension als Suspendiermittel mindestens ein Polysaccharid enthält.4. The method according to claim 1 or one of the following, characterized in that the aqueous suspension contains at least one polysaccharide as a suspending agent.
5. Verfahren nach Anspruch l oder einem der folgenden, dadurch gekennzeichnet, daß als kohlenstoffhaltige Feststoffe Kohlenstaub, Kohlenwasserstoffharze, Bitumen, Pech oder Naturasphalte verwendet werden.5. The method according to claim l or one of the following, characterized in that coal dust, hydrocarbon resins, bitumen, pitch or natural asphalts are used as carbon-containing solids.
6. Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß zusätzlich Glanzkohlenstoffbildner wie pflanzliches Öl oder Latexprodukte der Suspension zugegeben werden. 6. The method according to claim 1 or one of the following, characterized in that additionally glossy carbon formers such as vegetable oil or latex products are added to the suspension.
PCT/EP1997/005440 1996-10-22 1997-10-02 Method for producing moulding sand for foundry purposes WO1998017417A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996143514 DE19643514A1 (en) 1996-10-22 1996-10-22 Process for producing molding sand for foundry purposes
DE19643514.5 1996-10-22

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7188660B2 (en) 2002-02-07 2007-03-13 Iko Minerals Gmbh Method for producing a molding sand that is in particular recirculated, for foundry purposes
CN102581215A (en) * 2012-03-16 2012-07-18 常熟市建华模具有限责任公司 Casting method for glass mould blank
CN104841877A (en) * 2015-06-08 2015-08-19 含山县东山德雨球墨铸造厂 Method for manufacturing sand-falling-prevention anti-blocking sand mold

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2771663B1 (en) * 1997-12-03 2000-02-18 Manfred Buchler FLUID COMPOSITION CAPABLE OF PRODUCING GLOSSY CARBON DURING CASTING OF METAL AND PROCESS FOR PREPARING THE SAME
US20100269998A1 (en) 2009-02-02 2010-10-28 Charles Landis Modified Bentonites for Advanced Foundry Applications
RU2472598C1 (en) * 2011-08-12 2013-01-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования Волгоградский государственный технический университет (ВолгГТУ) Mix for making moulds and cores
RU2478018C1 (en) * 2011-08-12 2013-03-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования Волгоградский государственный технический университет (ВолгГТУ) Mix for making casting patterns
CN102814461A (en) * 2012-08-20 2012-12-12 合肥江淮铸造有限责任公司 Molding sand for casting
CN104550636A (en) * 2014-12-01 2015-04-29 繁昌县恒鑫汽车零部件有限公司 Molding sand for aluminum alloy casting and preparation method of molding sand

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Publication number Priority date Publication date Assignee Title
DE1952357A1 (en) * 1969-10-17 1971-04-29 Ravensberger Eisenhuette Styrene ethylene or propylene polymers - replacing carbon dust in casting mould comps
GB1348160A (en) * 1970-12-31 1974-03-13 Schuiling Metall Chemie Nv Moulding sand mix
FR2222153A1 (en) * 1973-03-19 1974-10-18 Buderus Eisenwerk Casting mould sand contg. polyester resin - as lustrous carbon former, in addition to bentonite and water
DE2419229A1 (en) * 1974-04-22 1975-11-06 Soeregger Ag Ingenieurbuero A Binding agent for moulding sand or core sand - comprising bentonite, wood flour and polyurethane
JPH0663687A (en) * 1992-08-20 1994-03-08 Kao Corp Green molding sand composition for production of casting and additive for green molding sand
JPH06154937A (en) * 1992-08-20 1994-06-03 Kao Corp Green sand composition for production of casting and additive for green and
US5587008A (en) * 1995-11-07 1996-12-24 Hill & Griffith Co. Sand molding media for iron castings

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1952357A1 (en) * 1969-10-17 1971-04-29 Ravensberger Eisenhuette Styrene ethylene or propylene polymers - replacing carbon dust in casting mould comps
GB1348160A (en) * 1970-12-31 1974-03-13 Schuiling Metall Chemie Nv Moulding sand mix
FR2222153A1 (en) * 1973-03-19 1974-10-18 Buderus Eisenwerk Casting mould sand contg. polyester resin - as lustrous carbon former, in addition to bentonite and water
DE2419229A1 (en) * 1974-04-22 1975-11-06 Soeregger Ag Ingenieurbuero A Binding agent for moulding sand or core sand - comprising bentonite, wood flour and polyurethane
JPH0663687A (en) * 1992-08-20 1994-03-08 Kao Corp Green molding sand composition for production of casting and additive for green molding sand
JPH06154937A (en) * 1992-08-20 1994-06-03 Kao Corp Green sand composition for production of casting and additive for green and
US5587008A (en) * 1995-11-07 1996-12-24 Hill & Griffith Co. Sand molding media for iron castings

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; AN 94-128554, XP002056498 *
DATABASE WPI Derwent World Patents Index; AN 94-220891, XP002056499 *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 302 (M - 1618) 9 June 1994 (1994-06-09) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 472 (M - 1667) 2 September 1994 (1994-09-02) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7188660B2 (en) 2002-02-07 2007-03-13 Iko Minerals Gmbh Method for producing a molding sand that is in particular recirculated, for foundry purposes
CN102581215A (en) * 2012-03-16 2012-07-18 常熟市建华模具有限责任公司 Casting method for glass mould blank
CN104841877A (en) * 2015-06-08 2015-08-19 含山县东山德雨球墨铸造厂 Method for manufacturing sand-falling-prevention anti-blocking sand mold

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