EP1095719B1 - Binder, core sand and process for their production - Google Patents

Binder, core sand and process for their production Download PDF

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Publication number
EP1095719B1
EP1095719B1 EP00122845A EP00122845A EP1095719B1 EP 1095719 B1 EP1095719 B1 EP 1095719B1 EP 00122845 A EP00122845 A EP 00122845A EP 00122845 A EP00122845 A EP 00122845A EP 1095719 B1 EP1095719 B1 EP 1095719B1
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Prior art keywords
binder system
core
binder
sand
solution
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German (de)
French (fr)
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EP1095719A2 (en
EP1095719A3 (en
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Thomas Prof. Dr.-Ing. Steinhäuser
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Hydro Aluminium Deutschland GmbH
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Hydro Aluminium Deutschland GmbH
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    • 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
    • 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
    • B22C1/20—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 organic agents
    • B22C1/205—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 organic agents of organic silicon or metal compounds, other organometallic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/12—Moulding machines for making moulds or cores of particular shapes for cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • B22C15/245—Blowing tubes

Definitions

  • the invention relates to a waterglass-based binder system consisting of an aqueous alkali metal silicate solution of the general composition: xSiO 2 .yM 2 O .zH 2 O, where for M the alkali ions are Li + , K + or Na + and a hygroscopic base which is in the ratio 1: 4 to 1: 6 is added, wherein the module Na 2 O / SiO 2 is 2.5 to 3.5 at a solids content of 20 to 40% by mass and wherein as hygroscopic base 30% sodium hydroxide solution in an aqueous Solution is used, as well as a core sand mixture and a method for its preparation.
  • binder contained in the binder system is used for Production of core moldings for foundry purposes.
  • binder are part of a molding material, which under certain Prerequisites, such as moistening or swelling and Silicate formation, the bond between the individual Produces sand grains.
  • Prerequisites such as moistening or swelling and Silicate formation, the bond between the individual Produces sand grains.
  • Ceramic binders are also used on chemical binders Water glass base or resin-based used, the react chemically with each other and get involved solidify.
  • the known binders are either insufficient stable or show unwanted side effects or Waste products that endanger the environment. As a favorable compromise have therefore water glass bound Formed materials that are solid via dehydration Form phases and solidify. It is not always easy to control the solidification processes, that they first enter the core-box. Especially By using modern core forming machines, the Danger of early solidification of the molding sand. As a result, the required good flow properties of sand as it flows into the core canister reached.
  • DE-OS 15 08 634 (Diamond Shamrock Corp.) discloses a binder for raw materials for the production of self-hardening casting molds and casting cores.
  • the binder consists of sodium silicate with a molar ratio of Na 2 O to SiO 2 of 1: 1, 5 to 1: 3 and potassium hydroxide, which is added in the form of an aqueous solution.
  • potassium hydroxide which is added in the form of an aqueous solution.
  • hydrogen is released under exothermic reaction, wherein the setting time is shortened by the addition of potassium hydroxide.
  • a heat input from the outside is not provided, with another silicon-containing material, such as ferrosilicon, must be added, but the grain size should be below 0.15 mm.
  • the fast setting is therefore possible only under certain limited conditions and the presence of several components that need to be precisely controlled.
  • 1.0 to 2.0% by mass of sodium hydroxide solution is added to a molding material mixture in order to improve the processability in the wet casting process of waterglass-bentonite or waterglass-clay mixtures.
  • the molding material consists of 2.0 to 5.0% by mass of sodium silicate from 0.5 to 1.0% by mass of starch and 2.0 to 4.0% by mass of clay, the remainder quartz sand.
  • the molding compound is applied to the model, backfilled with filling sand and the finished green form chemically or thermally solidified. These are therefore green sand molds which are not suitable for machine core production.
  • test specimens prepared therefrom are cured by esterification during a drying of 1 hour at 200 ° C and then subjected to a pressure test, giving a maximum strength of 500 to 600 N / m 2 .
  • This maximum value was achieved only with a molding material in which the surface-active component does not exceed a total amount of 0.1%, based on the total amount of the material.
  • From DE 29 09 107 is a method in production of bodies of granular and / or fibrous material with sodium silicate or potassium silicate as a binder known, wherein the mixture of the material surfactant is added.
  • the Surfactant may consist of a surfactant, silicone oil or a silicone emulsion in one Amount of at most 0.1% by mass, on the amount by weight Material calculated.
  • GB 857 132 discloses a composition for Production of foundry cores and molds, which 90% by weight Sand and 10 wt.% Binder contains.
  • the binder is an aqueous dispersion of an alkali metal silicate with a silicon to alkali metal oxide ratio of at least 0.5: 1.
  • the binder contains in one 1 to 15% by weight of an organosilicon additive, which averages between 0.9 to 1.7 monovalent aliphatic hydrocarbon radicals per silicon atom contains.
  • Object of the present invention is a Binder system for machine core production through core shooting / core bubbles that develop slightly dry (dry, powdered State) and thereby improved Has flowability and shortened setting time.
  • the core sliding machine consists of a vertical arranged housing A, to which a horizontal Air inlet B is flanged.
  • the air intake is over a large air inlet valve. 1 controlled, with an increased air pressure in the air reservoir tank 5 is pending.
  • the Air inlet valve 1 When opening the Air inlet valve 1, the air pressure enters the Machine room 10 of the housing A, in which a slotted Sand cylinder 6 is arranged vertically.
  • the sand cylinder 6 is connected to a sand reservoir 3, over a slide 4 can be emptied.
  • the core sand mixture of the invention contains a binder amount of 1.0 to 2.5% based on the total amount of granular solid.
  • the granular solid is silica sand with a degree of granulation of 0.1 to 0.3 mm.
  • the amount of the added sodium hydroxide in the binder system is 0.01 to 0.6 mass% and the silicone oil is contained therein at 0.1 to 0.5 mass%.
  • a compressive strength test is carried out with the binder according to the invention.
  • Compressive strength average of 5 tests 1060 N / cm 2

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Mold Materials And Core Materials (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

A binder system comprises an aqueous alkali silicate solution containing an emulsion solution with 8-10% silicone oil, and a hygroscopic base in a ratio of 1: 4-6. The silicone oil has a boiling point of at least 250 degrees C. The alkali silicate solution has the formula: xSiO2.yM2O.zH2O (where, M = Li<+>, K<+> or Na<+>). The module Na2O/SiO2 is 2.5-3.5 with a solids content of 20-40%. The hygroscopic base is 30% caustic soda in an aqueous solution. AN Independent claim is also included for the production of a core sand mixture containing the binder system.

Description

Die Erfindung betrifft ein Bindemittelsystem auf Wasserglasbasis, bestehend aus einer wässrigen Alkalisilikatlösung der allgemeinen Zusammensetzung: xSiO2 · yM2O · zH2O, wobei für M die Alkalionen Li+, K+ oder Na+ stehen und einer hygroskopischen Base, die im Verhältnis 1 : 4 bis 1 : 6 zugesetzt wird, wobei der Modul Na2O/SiO2 gleich 2,5 bis 3,5 bei einem Feststoffanteil von 20 bis 40 Masse-% beträgt und wobei als hygroskopische Base 30 %ige Natronlauge in einer wässrigen Lösung verwendet wird, sowie ein Kernsandgemisch und ein Verfahren zu seiner Herstellung.The invention relates to a waterglass-based binder system consisting of an aqueous alkali metal silicate solution of the general composition: xSiO 2 .yM 2 O .zH 2 O, where for M the alkali ions are Li + , K + or Na + and a hygroscopic base which is in the ratio 1: 4 to 1: 6 is added, wherein the module Na 2 O / SiO 2 is 2.5 to 3.5 at a solids content of 20 to 40% by mass and wherein as hygroscopic base 30% sodium hydroxide solution in an aqueous Solution is used, as well as a core sand mixture and a method for its preparation.

Der im Bindemittelsystem enthaltene Binder dient zur Herstellung von Kernformlingen für Gießereizwecke. Binder sind Bestandteil eines Formstoffes, der unter bestimmten Voraussetzungen, wie Anfeuchtung bzw. Quellung und Silikatbildung, den Verbund zwischen den einzelnen Sandkörnern herstellt. Neben den reinen Quellbindern und keramischen Bindern werden auch chemische Binder auf Wasserglasbasis oder auf Kunstharzbasis verwendet, die chemisch miteinander reagieren und sich dabei verfestigen.The binder contained in the binder system is used for Production of core moldings for foundry purposes. binder are part of a molding material, which under certain Prerequisites, such as moistening or swelling and Silicate formation, the bond between the individual Produces sand grains. In addition to the pure source binders and Ceramic binders are also used on chemical binders Water glass base or resin-based used, the react chemically with each other and get involved solidify.

Die bekannten Binder sind entweder nicht ausreichend stabil oder zeigen unerwünschte Nebenwirkungen bzw. Abfallprodukte, die die Umwelt gefährden. Als ein günstiger Kompromiß haben sich daher wasserglasgebundene Formstoffe erwiesen, die über eine Dehydratation feste Phasen bilden und dabei verfestigen. Es ist jedoch nicht immer einfach, die Verfestigungsprozesse so zu steuern, daß sie erst in der Kernbüchse eintreten. Insbesondere durch Verwendung moderner Kernformmaschinen besteht die Gefahr einer frühzeitigen Verfestigung des Formsandes. Dadurch werden die geforderten guten Fließeigenschaften des Sandes beim Einströmen in die Kernbüchse nicht erreicht.The known binders are either insufficient stable or show unwanted side effects or Waste products that endanger the environment. As a favorable compromise have therefore water glass bound Formed materials that are solid via dehydration Form phases and solidify. It is not always easy to control the solidification processes, that they first enter the core-box. Especially By using modern core forming machines, the Danger of early solidification of the molding sand. As a result, the required good flow properties of sand as it flows into the core canister reached.

Aus der DE-OS 15 08 634 (Diamond Shamrock Corp.) ist ein Bindemittel für Rohmassen zur Herstellung von selbsthärtenden Gießformen und Gießkernen bekannt. Das Bindemittel besteht aus Natriumsilikat mit einem Molverhältnis Na2O zu SiO2 von 1 : 1, 5 bis 1 : 3 und Kaliumhydroxid, das in Form einer wässrigen Lösung zugegeben wird. Bei der Abbindung wird unter exothermer Reaktion Wasserstoff freigegeben, wobei die Abbindezeit durch die Zugabe von Kaliumhydroxid verkürzt wird. Eine Wärmezufuhr von außen ist nicht vorgesehen, wobei ein weiteres siliziumhaltiges Material, z.B. Ferrosilizium, zugesetzt werden muß, dessen Korngröße jedoch unterhalb von 0,15 mm liegen sollte. Die schnelle Abbindung ist daher nur unter bestimmten, eng limitierten Voraussetzungen und der Anwesenheit mehrerer Komponenten möglich, die genau kontrolliert werden müssen.DE-OS 15 08 634 (Diamond Shamrock Corp.) discloses a binder for raw materials for the production of self-hardening casting molds and casting cores. The binder consists of sodium silicate with a molar ratio of Na 2 O to SiO 2 of 1: 1, 5 to 1: 3 and potassium hydroxide, which is added in the form of an aqueous solution. During setting, hydrogen is released under exothermic reaction, wherein the setting time is shortened by the addition of potassium hydroxide. A heat input from the outside is not provided, with another silicon-containing material, such as ferrosilicon, must be added, but the grain size should be below 0.15 mm. The fast setting is therefore possible only under certain limited conditions and the presence of several components that need to be precisely controlled.

Aus der DD 82 809 (DDR-Patent) wird zur Verbesserung der Verarbeitungsfähigkeit beim Naßgußverfahren von Wasserglas-Bentonit bzw. Wasserglas-Tongemischen 1,0 bis 2,0 Masse-% Natronlauge einem Formstoffgemisch zugesetzt. Der Formstoff besteht neben 2,0 bis 5,0 Masse-% Natrumsilikat aus 0,5 bis 1,0 Masse-% Stärke und 2,0 bis 4,0 Masse-% Ton, Rest Quarzsand. Die Formmasse wird dem Modell angelegt, mit Füllsand hinterfüllt und die fertige Grünform chemisch oder thermisch verfestigt. Es handelt sich daher um Grünsandformen, die für eine maschinelle Kernherstellung nicht geeignet sind. Die daraus hergestellten Probekörper werden gehärtet durch Veresterung während einer Trocknung von 1 Stunde bei 200°C und dann einer Druckprobe unterzogen, wobei sich eine maximale Festigkeit von 500 bis 600 N/m2 ergab. Dieser Maximalwert wurde nur mit einem Formstoff erreicht, bei dem die oberflächenaktive Komponente eine Gesamtmenge von 0,1 %, bezogen auf die Gesamtmenge des Materials, nicht überschreitet.From DD 82 809 (DDR patent), 1.0 to 2.0% by mass of sodium hydroxide solution is added to a molding material mixture in order to improve the processability in the wet casting process of waterglass-bentonite or waterglass-clay mixtures. The molding material consists of 2.0 to 5.0% by mass of sodium silicate from 0.5 to 1.0% by mass of starch and 2.0 to 4.0% by mass of clay, the remainder quartz sand. The molding compound is applied to the model, backfilled with filling sand and the finished green form chemically or thermally solidified. These are therefore green sand molds which are not suitable for machine core production. The test specimens prepared therefrom are cured by esterification during a drying of 1 hour at 200 ° C and then subjected to a pressure test, giving a maximum strength of 500 to 600 N / m 2 . This maximum value was achieved only with a molding material in which the surface-active component does not exceed a total amount of 0.1%, based on the total amount of the material.

Aus der DE 29 09 107 ist ein Verfahren bei Herstellung von Körpern aus körnigem und/oder faserhaltigem Material mit Natriumsilikat oder Kaliumsilikat als Bindemittel bekannt, wobei der Mischung des Materials ein oberflächenaktiver Stoff zugesetzt wird. Der oberflächenaktive Stoff kann aus einem Tensid, Silikonöl oder einer Silikonemulsion bestehen und zwar in einer Menge von höchstens 0,1 Masse-%, auf die Gewichtsmenge Material berechnet.From DE 29 09 107 is a method in production of bodies of granular and / or fibrous material with sodium silicate or potassium silicate as a binder known, wherein the mixture of the material surfactant is added. Of the Surfactant may consist of a surfactant, silicone oil or a silicone emulsion in one Amount of at most 0.1% by mass, on the amount by weight Material calculated.

Die GB 857 132 offenbart eine Zusammensetzung zur Herstellung von Gießkernen und -formen, welche 90 Gew.% Sand und 10 Gew.% Bindemittel enthält. Das Bindemittel ist eine wässrige Dispersion eines Alkalimetallsilikats mit einem Silizium- zu Alkalimetalloxidverhältnis von mindestens 0,5:1. Ferner enthält das Bindemittel in einem Anteil von 1 bis 15 Gew.% ein Organosiliziumadditiv, welches im Mittel zwischen 0,9 bis 1,7 monovalente aliphatische Kohlenwasserstoffradikale pro Siliziumatom enthält. GB 857 132 discloses a composition for Production of foundry cores and molds, which 90% by weight Sand and 10 wt.% Binder contains. The binder is an aqueous dispersion of an alkali metal silicate with a silicon to alkali metal oxide ratio of at least 0.5: 1. Furthermore, the binder contains in one 1 to 15% by weight of an organosilicon additive, which averages between 0.9 to 1.7 monovalent aliphatic hydrocarbon radicals per silicon atom contains.

Aufgabe der vorliegenden Erfindung ist es, ein Bindemittelsystem für die maschinelle Kernherstellung durch Kernschießen /Kernblasen zu entwickeln, das sich leicht im Trockenverfahren (im trockenen, pulverisierten Zustand) verarbeiten läßt und dabei eine verbesserte Fließfähigkeit und verkürzte Abbindezeit aufweist.Object of the present invention is a Binder system for machine core production through core shooting / core bubbles that develop slightly dry (dry, powdered State) and thereby improved Has flowability and shortened setting time.

Diese Aufgabe wird erfindungsgemäß durch die in den Patentansprüchen angegebenen Merkmale gelöst. This object is achieved by the in the Claims specified features solved.

Das neue Bindemittelsystem auf Wasserglasbasis besteht aus einer wässrigen Alkalisilikatlösung der allgemeinen Zusammensetzung: xSiO2 · yM2O · zH2O, wobei für M die Alkalionen Li+, K+ oder Na+ stehen, und ist dadurch gekennzeichnet, daß es zusätzlich eine hygroskopische Base enthält. Als hygroskopische Base wird Natronlauge im Verhältnis 1 : 4 bis 1 : 6 eingesetzt. Sofern der Modul Na2O/SiO2 gleich 2,5 bis 3,5 bei einem Feststoffanteil von 20 bis 40 Masse-% beträgt, wird unter allen Betriebszuständen verhindert, daß sich der Formsand frühzeitig verfestigt. Als hygroskopische Base wird 30 %ige Natronlauge in einer wässrigen Lösung verwendet. Zur Steuerung der hygroskopischen Eigenschaften wird ein oberflächenaktiver Stoff zugesetzt. Als oberflächenaktiver Stoff wird dem Bindemittelsystem Silikonöl mit einem Siedepunkt ≥ 250° zugesetzt. Somit kann die Fließfähigkeit des Formsandes in der Kernschießmaschine wesentlich gesteigert werden. Dem Bindemittelsystem wird eine Emulsionslösung mit 8 bis 10 Masse-% Silikonöl bezogen auf die Bindermenge zugesetzt. Ferner sind folgende vorteilhafte Weiterbildungen möglich:

  • a) die Silikon-Emulsionslösung weist anionische, kationische, nicht-ionogene Eigenschaften auf,
  • b) in der Emulsionslösung wird ein Emulgator eingesetzt, der die Viskosität des Basisöls erhöht und gleichzeitig die Grenzflächenspannung des Bindemittelsystems herabsetzt. Der Emulgator weist einen hydrophilen und einen lipophilen Molkekülteil auf, der in die Ölphase hineinragt,
  • c) als Basisöl für die Silikon-Emulsionslösung wird ein Öl eingesetzt, das in dem Bindemittelsystem einen Natriumoleat-Film ausbildet, der in der Grenzfläche des dispersen Systems eine mechanisch stabile Schutzschicht erzeugt.
  • d) die Silikonöl-Emulsionslösung weist folgende Struktur auf:
    • die Si-Atome sind mit jeweils zwei CH3-Gruppen verbunden,
    • die Si-Atome sind untereinander über Sauerstoffatome verbunden und bilden eine Kette, wobei die CH3-Gruppen der jeweils benachbarten Si-Atome um die Sauerstoffatome räumlich verschiebbar angeordnet sind.
    • The new waterglass-based binder system consists of an aqueous alkali silicate solution of the general composition: xSiO 2 .yM 2 O.zH 2 O, where for M the alkali ions are Li + , K + or Na + , and is characterized in that it additionally has a hygroscopic Base contains. The hygroscopic base used is sodium hydroxide in a ratio of 1: 4 to 1: 6. If the module Na 2 O / SiO 2 is 2.5 to 3.5 at a solids content of 20 to 40% by mass, it is prevented under all operating conditions that the molding sand solidifies early. As hygroscopic base 30% sodium hydroxide solution is used in an aqueous solution. To control the hygroscopic properties, a surfactant is added. As the surfactant, silicone oil having a boiling point ≥ 250 ° is added to the binder system. Thus, the flowability of the molding sand in the core shooter can be significantly increased. An emulsion solution containing 8 to 10% by mass of silicone oil based on the amount of binder is added to the binder system. Furthermore, the following advantageous developments are possible:
  • a) the silicone emulsion solution has anionic, cationic, non-ionic properties,
  • b) in the emulsion solution, an emulsifier is used, which increases the viscosity of the base oil and at the same time reduces the interfacial tension of the binder system. The emulsifier has a hydrophilic and a lipophilic whey fraction, which protrudes into the oil phase,
  • c) as the base oil for the silicone emulsion solution, an oil is used which forms a sodium oleate film in the binder system, which produces a mechanically stable protective layer in the interface of the disperse system.
  • d) the silicone oil emulsion solution has the following structure:
    • the Si atoms are connected to two CH 3 groups each,
    • the Si atoms are connected to each other via oxygen atoms and form a chain, wherein the CH 3 groups of the respective adjacent Si atoms are arranged spatially displaceable around the oxygen atoms.

    • Im folgenden wird die Erfindung anhand eines Vergleichsbeispieles näher erläutert. Dabei wird eine Kernschießmaschine gemäß Figur 1 verwendet, die den folgenden Aufbau aufweist:In the following the invention is based on a Comparative example explained in more detail. There will be a Core shooter used in accordance with Figure 1, the has the following structure:

    Die Kernschiebmaschine besteht aus einem vertikal angeordneten Gehäuse A, an das ein horizontaler Lufteintritt B angeflanscht ist. Der Lufteintritt wird über ein großflächiges Lufteintrittsventil 1 gesteuert, wobei ein erhöhter Luftdruck in dem Luftvorratstank 5 ansteht. Beim Öffnen des Lufteintrittsventils 1 gelangt der Luftdruck in den Maschinenraum 10 des Gehäuses A, in dem ein geschlitzter Sandzylinder 6 vertikal angeordnet ist. Der Sandzylinder 6 ist mit einem Sandvorratsbehälter 3 verbunden, der über einen Schieber 4 entleert werden kann. The core sliding machine consists of a vertical arranged housing A, to which a horizontal Air inlet B is flanged. The air intake is over a large air inlet valve. 1 controlled, with an increased air pressure in the air reservoir tank 5 is pending. When opening the Air inlet valve 1, the air pressure enters the Machine room 10 of the housing A, in which a slotted Sand cylinder 6 is arranged vertically. The sand cylinder 6 is connected to a sand reservoir 3, over a slide 4 can be emptied.

    Im Fall der Betätigung des Lufteintrittsventils wird Sand aus dem geschlitzten Sandzylinder 6 in den Schießkopf 7 mit Sandaustrittsöffnung befördert und tritt in die Kernbüchse 8 ein, wobei eine Kernsandentlüftung 9a, 9b für die Erzeugung des verdichteten Kernsandes 11 sorgt.In the case of actuation of the air inlet valve becomes sand from the slotted sand cylinder 6 in the shooting head. 7 transported with sand outlet and enters the Kernbüchse 8, wherein a core sand vent 9a, 9b provides for the production of the compacted core sand 11.

    Zur Beurteilung des Feuchtigkeitsgehalts des Formsandes ist im Luftaustrittsventil 2 eine Feuchtigkeitsmessung integriert. Mit dieser Anordnung wurde festgestellt, daß bei der erfindungsgemäßen Ausbildung des Kernsandes wesentlich höhere Feuchtigkeitsgehalte und damit eine bessere Viskosität und ein besseres Fließvermögen des Formsandes erreicht werden konnte.
    Das erfindungsgemäße Kernsandgemisch enthält eine Bindermenge von 1,0 bis 2,5 % bezogen auf die Gesamtmenge an körnigem Feststoff. Vorzugsweise ist der körnige Feststoff Quarzsand mit einem Körnungsgrad von 0,1 bis 0,3 mm. Die Menge der zugesetzten Natronlauge im Bindemittelsystem beträgt 0,01 bis 0,6 Masse-% und das Silikonöl ist darin mit 0,1 bis 0,5 Masse-% enthalten. Im folgenden wird eine Druckfestigkeitsuntersuchung mit dem erfindungsgemäßen Bindemittel durchgeführt.    To assess the moisture content of the molding sand, a moisture measurement is integrated in the air outlet valve 2. With this arrangement, it was found that in the formation of the core sand according to the invention substantially higher moisture contents and thus a better viscosity and a better flowability of the molding sand could be achieved.
    The core sand mixture of the invention contains a binder amount of 1.0 to 2.5% based on the total amount of granular solid. Preferably, the granular solid is silica sand with a degree of granulation of 0.1 to 0.3 mm. The amount of the added sodium hydroxide in the binder system is 0.01 to 0.6 mass% and the silicone oil is contained therein at 0.1 to 0.5 mass%. In the following, a compressive strength test is carried out with the binder according to the invention.

    Serie 1, Gattierung:Series 1, Gattierung:

    2,4 Masse-% Binder, 0,4 Masse-% Emulsion, Rest Quarzsand2.4% by mass binder, 0.4% by mass emulsion, rest quartz sand

    Probengewicht 158 g, Probekörper - Normhöhe 50 mmSample weight 158 g, specimen - standard height 50 mm

    Nach der Entnahme aus der Kernschießmaschine 2 Minuten Mikrowellentrocknung.After removal from the core shooting machine 2 minutes Microwave drying.

    Prüfung nach 30 Minuten bei Raumtemperatur.Test after 30 minutes at room temperature.

    Druckfestigkeit: Mittelwert aus 5 Prüfungen 1060 N/cm2 Compressive strength: average of 5 tests 1060 N / cm 2

    Serie 2, Gattierung:Series 2, Gattierung:

    2,4 Masse-% Binder, 0,4 Masse-% NaOa, 0,2 Masse-% Silikonöl, Rest Quarzsand
    Probengewicht: 157 g, Prüfkörper - Normhöhe 50 mm
    Nach der Entnahme aus der Kernschießmaschine 2 Minuten Mikrowellentrocknung.
    Druckfestigkeitsprüfung nach 30 Minuten bei Raumtemperatur. Festigkeitsmittelwert aus 5 Prüfungen: 1164 N/cm2.    2.4% by mass of binder, 0.4% by mass of NaOa, 0.2% by mass of silicone oil, rest quartz sand
    Sample weight: 157 g, specimen - standard height 50 mm
    After removal from the core shooter 2 minutes microwave drying.
    Compressive strength test after 30 minutes at room temperature. Strength average of 5 tests: 1164 N / cm 2 .

    Aus diesem Vergleichsversuch ergibt sich, daß das erfindungsgemäße Bindemittelsystem mit einer üblichen Kernschießmaschine zu hochfesten Formkörpern verarbeitet werden kann. Die Prüfkörper weisen eine ca. 10%ige Verbesserung an der Druckfestigkeit auf, wenn der Prüfmischung 0,2 Masse-% Silikonöl zugesetzt wird. Bei einem Einsatz des erfindungsgemäßen Verfahrens gemäß Anspruch 10 würde sich die Druckfestigkeit noch weiter steigern lassen.From this comparative experiment shows that the Inventive binder system with a conventional Core shooter processed into high-strength moldings can be. The test specimens have an approx. 10% Improvement in compressive strength when the Test mixture 0.2% by mass of silicone oil is added. at a use of the method according to the invention Claim 10, the pressure resistance would be even further let increase.

    Claims (8)

    1. Binder system based on water glass, consisting of an aqueous alkali silicate solution with the general composition: xSiO2 · yM2O · zH2O, where M represents the alkali ions Li+, K+ or Na+, and of a hygroscopic base which is added in a ratio of 1 : 4 to 1 : 6, the modulus Na2/SiO2 being equal 2.5 to 3.5 with a proportion of solids of 20 to 40 % by weight, and a 30 % caustic soda solution in an aqueous solution being used as hygroscopic base, characterised in that the aqueous alkali silicate solution contains a silicone emulsions solution with 8 to 10 % by weight of silicone oil, based on the quantity of binder, the silicone oil exhibiting a boiling point of = 250 °C.
    2. Binder system according to one of the preceding claims characterised in that the silicone emulsion solution exhibits anionic, cationic, non-ionic properties.
    3. Binder system according to one of the preceding claims characterised in that the silicone oil emulsion solution exhibits the following structure:
      the Si atoms are attached to two CH3 groups respectively
      the Si atoms are attached to each other via oxygen atoms and form a chain, die CH3 groups of the adjacent Si atoms being in each case spatially displaceably arranged around the oxygen atoms.
    4. Core sand mixture containing a binder system according to one of the preceding claims characterised in that the quantity of binder amounts to 1.0 to 2.5 % by weight, based on the total quantity of granular solid.
    5. Core sand binder system according to the preceding claim characterised in that quartz sand with a degree of granulation of 0.1 to 0.3 mm is used as granular solid.
    6. Core sand binder system according to one of the preceding claims characterised in that 0.01 to 0.6 % by weight of caustic soda solution is contained in the binder system.
    7. Core sand binder system according to one of the preceding claims characterised in that 0.1 to 0.5 % by weight of silicone oil is contained in the binder system.
    8. Process for the production of a core sand mixture containing a binder system according to one of the preceding claims characterised in that, in a core ejection machine consisting of a vertically arranged housing with a horizontal air inlet, the core sand mixture is introduced via a funnel into a slotted sand cylinder, the connection between the funnel and the sand cylinder being closed during the injection and that the core sand mixture present in the slotted sand cylinder is compacted with an atmospheric pressure of p1 and then injected into the core sleeve at a pressure of p2 > p1.
    EP00122845A 1999-10-26 2000-10-20 Binder, core sand and process for their production Expired - Lifetime EP1095719B1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    SI200030829T SI1095719T1 (en) 1999-10-26 2000-10-20 Binder, core sand and process for their production

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19951622A DE19951622A1 (en) 1999-10-26 1999-10-26 Binder system based on water glass
    DE19951622 1999-10-26

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    EP1095719A2 EP1095719A2 (en) 2001-05-02
    EP1095719A3 EP1095719A3 (en) 2001-06-20
    EP1095719B1 true EP1095719B1 (en) 2005-12-28

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    EP (1) EP1095719B1 (en)
    AT (1) ATE314168T1 (en)
    BR (1) BR0015090B1 (en)
    CZ (1) CZ297087B6 (en)
    DE (4) DE29925010U1 (en)
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    HU (1) HU225725B1 (en)
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    WO2001030517A3 (en) 2001-12-27
    DE29925010U1 (en) 2008-09-04
    MXPA02004239A (en) 2003-10-06
    WO2001030517A2 (en) 2001-05-03
    NO20021961D0 (en) 2002-04-25
    CZ20021415A3 (en) 2003-01-15
    BR0015090B1 (en) 2011-01-25
    DE29925011U1 (en) 2008-10-02
    EP1095719A2 (en) 2001-05-02
    HU225725B1 (en) 2007-07-30
    SK286218B6 (en) 2008-05-06
    HUP0203178A2 (en) 2003-05-28
    DE50011962D1 (en) 2006-02-02
    TR200201117T2 (en) 2002-12-23
    US7022178B1 (en) 2006-04-04
    SI1095719T1 (en) 2006-08-31
    BR0015090A (en) 2002-06-11
    SK5722002A3 (en) 2003-03-04
    ES2255932T3 (en) 2006-07-16
    EP1095719A3 (en) 2001-06-20
    NO20021961L (en) 2002-04-25
    CZ297087B6 (en) 2006-09-13
    NO334154B1 (en) 2013-12-23
    ATE314168T1 (en) 2006-01-15
    DE19951622A1 (en) 2001-05-23

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