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EP0773079A1 - Pattern and mould for lost pattern casting - Google Patents

Pattern and mould for lost pattern casting Download PDF

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Publication number
EP0773079A1
EP0773079A1 EP96115425A EP96115425A EP0773079A1 EP 0773079 A1 EP0773079 A1 EP 0773079A1 EP 96115425 A EP96115425 A EP 96115425A EP 96115425 A EP96115425 A EP 96115425A EP 0773079 A1 EP0773079 A1 EP 0773079A1
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EP
European Patent Office
Prior art keywords
model
full mold
substance
full
mold casting
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.)
Granted
Application number
EP96115425A
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German (de)
French (fr)
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EP0773079B1 (en
Inventor
Horst Foltin
Carsten Dr. Kuhlgatz
Thorsten Foltin
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Albertuswerke GmbH
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Huettenes Albertus Chemische Werke GmbH
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Publication of EP0773079A1 publication Critical patent/EP0773079A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns

Definitions

  • the full mold casting process (DE-C-11 08 861) has in the meantime gained considerable importance in foundry technology.
  • lost models that remain in the mold are embedded in a usually binder-free molding material that forms a one-piece mold.
  • the models for carrying out the full mold casting process so far consist of foamed, non-rotting plastic, usually polystyrene, and they are continuously (and with the exclusion of air) decomposed by pouring liquid metal into the mold. The liquid metal displaces the plastic foam model and finally forms a full-form casting, the shape of which corresponds to the now destroyed lost model.
  • the full mold casting process in its described manner has considerable advantages over the conventional hollow mold casting process, but during the decomposition of the plastic foam models used in the absence of air, graphite is formed in addition to decomposition gases, and this is later found as an inclusion of impurities in the casting. as is regularly shown in structural examinations.
  • the graphite produced by decomposition in any case influences the material properties of the casting, and such an influence is generally undesirable. This applies in particular - but not only - to castings made from spheroidal graphite cast iron (GGG), lamellar graphite cast iron (GG) or other iron alloys with specific material properties.
  • the invention is based on the surprising finding that a model which, as an essential component, comprises a completely decomposable (for example biodegradable or light-degradable) substance and preferably has an essentially foam-like structure leads to improved and often even excellent full-mold casting results .
  • the structure of castings, which are produced using such models has surprisingly little or no visible contamination or irregularities.
  • the decomposable substance which can comprise, for example, a low-density polyethylene (PE-LD) or a biopolymer, preferably has a mass fraction of over 80%.
  • the decomposable substance comprises starch, cellulose and / or a derivative of one of these substances, the decomposable substance thus being based on renewable raw materials, have proven to be particularly suitable. Their use means that petrochemical model materials can be largely avoided.
  • Starch, cellulose and their derivatives decomposable substances based on renewable raw materials
  • Cellulose can be used in particular in the form of waste paper or cardboard and preferably in a mixture with starch.
  • an additional foaming agent is added to the rotting substance to produce the model or - as is particularly favorable in the case of starch and its derivatives that can be expanded by water vapor - the own foaming ability of the rotting substance exploited.
  • the model additionally comprises a binder, a lubricant, a plasticizer or an elasticity improver as an auxiliary. All of the auxiliaries mentioned are preferably rotable.
  • the decomposable substances in particular those based on renewable raw materials, react sensitively to the water contained in water sizes, but are surprisingly insensitive to the alcohol contained in an alcohol size.
  • a particularly important aspect of the invention relates to environmental compatibility.
  • Conventional full mold casting using foam models based on non-decomposable plastics creates gaseous decomposition products that are classified as hazardous to health and that have to be post-treated.
  • thermal decomposition of pure polystyrene creates carcinogenic benzene and styrene.
  • the thermal decomposition of the models according to the invention if they consist entirely of starch, cellulose and / or their derivatives, does not produce any noteworthy quantities of gases which are hazardous to health. If the substances mentioned are used within the scope of the invention together with the plastic foams which have hitherto been customary as model materials, they reduce the mass fraction of the substances in the decomposition product which are hazardous to health in accordance with their mass fraction.
  • foam residues to be sorted out remain in every foaming process for the production of models.
  • the remains of the previously non-rotten plastic foams can only be processed to inferior molded parts or must be used as an energy source in the high-temperature furnace.
  • models made from completely rotten substances can be easily disposed of.
  • pure waste paper starch foams are completely broken down under the influence of water and natural bacteria in three to four months and serve as a nutrient for humus bacteria.
  • a model part made of thin-walled starch foam was coated with a commercially available alcohol size and provided with a conventional, non-rotting foam tube as a pouring barrel. A full form was produced, which was cast with cast iron with lamellar graphite (GG).
  • GG lamellar graphite
  • a model part made of coarse-celled paper-starch foam consisting essentially of shredded waste paper and wheat starch (density: 10 g / l; mixing ratio approx. 50:50; foaming in the extruder by steam), was coated with a commercially available alcohol size and with a conventional, Provide non-rotten foam pipe as a pouring run. A full form was produced, which was cast with cast iron with lamellar graphite (GG).
  • GG lamellar graphite
  • a model part made of the same paper-starch foam as in Example 2 was coated with a commercially available alcohol size and provided with a conventional, non-rotting foam tube as a pouring run. A full mold was produced, which was cast with spheroidal graphite cast iron (GGG).
  • GGG spheroidal graphite cast iron

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

Models for full mould casting of metals by the lost model process are made by using as essential component a substance that is fully degradable by natural means (e.g. biological attack or exposure to light).

Description

In der Gießereitechnik hat das Vollformgießverfahren (DE-C-11 08 861) inzwischen eine beträchtliche Bedeutung erlangt. Beim Vollformgießverfahren werden verlorene, in der Form verbleibende Modelle in einen für gewöhnlich binderfreien Formstoff eingebettet, der eine einteilige Form bildet. Die Modelle zur Durchführung des Vollformgießverfahrens bestehen dabei bisher aus aufgeschäumtem, nicht verrottbarem Kunststoff, in der Regel Polystyrol, und sie werden durch das Eingießen flüssigen Metalls in die Form kontinuierlich (und unter Luftabschluß) zersetzt. Das flüssige Metall verdrängt dabei das Kunststoff-Schaummodell und bildet schließlich ein Vollform-Gußstück, das in seiner Gestalt dem nun zerstörten verlorenen Modell entspricht.The full mold casting process (DE-C-11 08 861) has in the meantime gained considerable importance in foundry technology. In the full mold casting process, lost models that remain in the mold are embedded in a usually binder-free molding material that forms a one-piece mold. The models for carrying out the full mold casting process so far consist of foamed, non-rotting plastic, usually polystyrene, and they are continuously (and with the exclusion of air) decomposed by pouring liquid metal into the mold. The liquid metal displaces the plastic foam model and finally forms a full-form casting, the shape of which corresponds to the now destroyed lost model.

Das Vollformgießverfahren in seiner beschriebenen Art weist zwar erhebliche Vorteile gegenüber dem konventionellen Hohlform-Gießverfahren auf, doch bildet sich bei der unter Luftabschluß stattfindenden Zersetzung der eingesetzten Kunststoff-Schaummodelle neben Zersetzungsgasen auch Graphit, und dieser findet sich später als Verunreinigungs-Einschluß im Gußstück wieder, wie sich regelmäßig bei Gefügeuntersuchungen zeigt. Der durch Zersetzung entstandene Graphit beeinflußt in jedem Fall die Materialeigenschaften des Gußstücks, und eine solche Beeinflussung ist in der Regel unerwünscht. Dies gilt insbesondere - aber nicht nur - für Gußstücke, die aus Gußeisen mit Kugelgraphit (GGG), Gußeisen mit Lamellengraphit (GG) oder anderen Eisen-Legierungen mit spezifischen Materialeigenschaften hergestellt sind.The full mold casting process in its described manner has considerable advantages over the conventional hollow mold casting process, but during the decomposition of the plastic foam models used in the absence of air, graphite is formed in addition to decomposition gases, and this is later found as an inclusion of impurities in the casting. as is regularly shown in structural examinations. The graphite produced by decomposition in any case influences the material properties of the casting, and such an influence is generally undesirable. This applies in particular - but not only - to castings made from spheroidal graphite cast iron (GGG), lamellar graphite cast iron (GG) or other iron alloys with specific material properties.

Es war die Aufgabe der vorliegenden Erfindung, das geschilderte Problem, nämlich den Einschluß von Zersetzungs-Graphit in Vollform-Gußstücken, zu überwinden oder zumindest zu entschärfen. Diese Aufgabe wird durch die aus den Patentansprüchen zu entnehmende technische Lehre gelöst.It was the object of the present invention to overcome or at least alleviate the described problem, namely the inclusion of decomposition graphite in full-form castings. This problem is solved by the technical teaching to be extracted from the patent claims.

Die Erfindung beruht auf der überraschenden Erkenntnis, daß ein Modell, das als einen wesentlichen Bestandteil eine vollständig verrottbare (z.B. biologisch oder durch Lichteinwirkung abbaubare) Substanz umfaßt und vorzugsweise eine im wesentlichen schaumartige Struktur besitzt, zu verbesserten und oftmals sogar zu hervorragenden Vollform-Gießergebnissen führt. Insbesondere weist das Gefüge von Gußstücken, die unter Verwendung solcher Modelle hergestellt werden, überraschend wenig bzw. gar keine sichtbaren Verunreinigungen oder Unregelmäßigkeiten auf. Vorzugsweise besitzt die verrottbare Substanz, die bspw. ein Polyethylen niedriger Dichte (PE-LD) oder ein Biopolymer umfassen kann, einen Massenanteil von über 80%.The invention is based on the surprising finding that a model which, as an essential component, comprises a completely decomposable (for example biodegradable or light-degradable) substance and preferably has an essentially foam-like structure leads to improved and often even excellent full-mold casting results . In particular, the structure of castings, which are produced using such models, has surprisingly little or no visible contamination or irregularities. The decomposable substance, which can comprise, for example, a low-density polyethylene (PE-LD) or a biopolymer, preferably has a mass fraction of over 80%.

Als erstaunlicherweise besonders geeignet haben sich Modelle erwiesen, bei denen die verrottbare Substanz Stärke, Cellulose und/oder ein Derivat eines dieser Stoffe umfaßt, die verrottbare Substanz also auf nachwachsenden Rohstoffen basiert. Ihr Einsatz ermöglicht einen weitgehenden Verzicht auf petrochemische Modell-Werkstoffe. Stärke, Cellulose und ihre Derivate (verrottbare Substanzbildner auf Basis nachwachsender Rohstoffe) können einzeln, in Kombination miteinander und in Kombination mit anderen Stoffen zum Einsatz kommen. Sie können zuvor durch an sich bekannte Bearbeitungsverfahren konditioniert oder modifiziert worden sein. Cellulose kann insbesondere in Form von Altpapier oder Pappe und vorzugsweise in Mischung mit Stärke eingesetzt werden.Models in which the decomposable substance comprises starch, cellulose and / or a derivative of one of these substances, the decomposable substance thus being based on renewable raw materials, have proven to be particularly suitable. Their use means that petrochemical model materials can be largely avoided. Starch, cellulose and their derivatives (decomposable substances based on renewable raw materials) can be used individually, in combination with one another and in combination with other substances. They may have previously been conditioned or modified by processing methods known per se. Cellulose can be used in particular in the form of waste paper or cardboard and preferably in a mixture with starch.

Je nach Bedarf wird der verrottbaren Substanz zur Herstellung des Modells ein zusätzliches Schäumungsmittel als Hilfsstoff zugesetzt oder - wie im Fall von durch Wasserdampf expandierbarer Stärke und ihren Derivaten besonders günstig - die eigene Schäumungsfähigkeit der verrottbaren Substanzbildner ausgenutzt. In manchen Fällen hat es sich als günstig erwiesen, wenn das Modell als Hilfsstoff zusätzlich ein Bindemittel, ein Gleitmittel, einen Weichmacher oder einen Elastizitätsverbesserer umfaßt. Sämtliche genannten Hilfsstoffe sind dabei vorzugsweise verrottbar.Depending on the need, an additional foaming agent is added to the rotting substance to produce the model or - as is particularly favorable in the case of starch and its derivatives that can be expanded by water vapor - the own foaming ability of the rotting substance exploited. In some cases, it has proven to be advantageous if the model additionally comprises a binder, a lubricant, a plasticizer or an elasticity improver as an auxiliary. All of the auxiliaries mentioned are preferably rotable.

Besonders günstig ist es, ein erfindungsgemäßes Modell durch eine Alkoholschlichte vom umgebenden Formmaterial zu trennen. Die verrottbaren Substanzen, insbesondere die auf der Basis nachwachsender Rohstoffe, reagieren nämlich empfindlich auf das in Wasserschlichten enthaltene Wasser, sind jedoch überraschend unempfindlich gegen den in einer Alkoholschlichte enthaltenen Alkohol.It is particularly advantageous to separate an inventive model from the surrounding molding material by means of an alcohol size. The decomposable substances, in particular those based on renewable raw materials, react sensitively to the water contained in water sizes, but are surprisingly insensitive to the alcohol contained in an alcohol size.

Ein besonders wichtiger Aspekt der Erfindung betrifft die Umweltverträglichkeit. Beim konventionellen Vollformgießen unter Verwendung von Schaumstoff-Modellen auf Basis nicht-verrottbarer Kunststoffe entstehen als gesundheitsgefährdend eingestufte gasförmige Zersetzungsprodukte, die nachbehandelt werden müssen. So entstehen beispielsweise bei der thermischen Zersetzung reinen Polystyrols krebserregendes Benzol und Styrol. Bei der thermischen Zersetzung der erfindungsgemäßen Modelle hingegen entstehen, wenn diese vollständig aus Stärke, Cellulose und/oder deren Derivaten bestehen, keine nennenswerten Mengen gesundheitsgefährdender Gase. Werden die genannten Stoffe im Rahmen der Erfindung gemeinsam mit den bisher als Modellwerkstoff üblichen Kunststoff-Schäumen eingesetzt, so reduzieren sie ihrem Massenanteil entsprechend die Menge gesundheitsgefährdender Stoffe im Zersetzungsprodukt.A particularly important aspect of the invention relates to environmental compatibility. Conventional full mold casting using foam models based on non-decomposable plastics creates gaseous decomposition products that are classified as hazardous to health and that have to be post-treated. For example, thermal decomposition of pure polystyrene creates carcinogenic benzene and styrene. In contrast, the thermal decomposition of the models according to the invention, if they consist entirely of starch, cellulose and / or their derivatives, does not produce any noteworthy quantities of gases which are hazardous to health. If the substances mentioned are used within the scope of the invention together with the plastic foams which have hitherto been customary as model materials, they reduce the mass fraction of the substances in the decomposition product which are hazardous to health in accordance with their mass fraction.

Es ist ferner wichtig zu bemerken, daß bei jedem Schäumprozeß zur Herstellung von Modellen auszusortierende Schaumreste übrigbleiben. Die Reste der bisher eingesetzten nicht-verrottbaren Kunststoff-Schäume können nur zu minderwertigen Formteilen verarbeitet werden oder müssen im Hochtemperaturofen als Energiequelle genutzt werden. Modelle aus vollständig verrottbaren Substanzen können hingegen leicht entsorgt werden. Beispielsweise werden reine Altpapier-Stärke-Schäume unter Einfluß von Wasser und natürlichen Bakterien in drei bis vier Monaten vollständig abgebaut und dienen dabei als Nährstoff für Humusbakterien.It is also important to note that foam residues to be sorted out remain in every foaming process for the production of models. The remains of the previously non-rotten plastic foams can only be processed to inferior molded parts or must be used as an energy source in the high-temperature furnace. However, models made from completely rotten substances can be easily disposed of. For example, pure waste paper starch foams are completely broken down under the influence of water and natural bacteria in three to four months and serve as a nutrient for humus bacteria.

Die Erfindung wird nachfolgend anhand von Beispielen näher erläutert:The invention is explained in more detail below with the aid of examples:

Beispiel 1:Example 1:

Ein Modellteil aus dünnwandigem Stärkeschaum wurde mit einer handelsüblichen Alkoholschlichte überzogen und mit einem konventionellen, nichtverrottbaren Schaumstoffrohr als Gießlauf versehen. Es wurde eine Vollform hergestellt, die mit Gußeisen mit Lamellengraphit (GG) abgegossen wurde.A model part made of thin-walled starch foam was coated with a commercially available alcohol size and provided with a conventional, non-rotting foam tube as a pouring barrel. A full form was produced, which was cast with cast iron with lamellar graphite (GG).

Es ergab sich ein Gußstück, das eine nur sehr kleine Menge an im Schliffbild mikroskopisch sichtbaren Verunreinigungen enthielt.The result was a casting which contained only a very small amount of impurities which were microscopically visible in the micrograph.

Beispiel 2:Example 2:

Ein Modellteil aus grobzelligem Papier-Stärke-Schaum, im wesentlichen bestehend aus zerfasertem Altpapier und Weizenstärke (Dichte: 10g/l; Mischungsverhältnis ca. 50:50; Aufschäumung im Extruder durch Wasserdampf), wurde mit einer handelsüblichen Alkohlschlichte überzogen und mit einem konventionellen, nicht-verrottbaren Schaumstoffrohr als Gießlauf versehen. Es wurde eine Vollform hergestellt, die mit Gußeisen mit Lamellengraphit (GG) abgegossen wurde.A model part made of coarse-celled paper-starch foam, consisting essentially of shredded waste paper and wheat starch (density: 10 g / l; mixing ratio approx. 50:50; foaming in the extruder by steam), was coated with a commercially available alcohol size and with a conventional, Provide non-rotten foam pipe as a pouring run. A full form was produced, which was cast with cast iron with lamellar graphite (GG).

Es ergab sich ein Gußstück ohne im Schliffbild mikroskopisch sichtbare Verunreinigungen.The result was a casting without any microscopically visible impurities.

Beispiel 3:Example 3:

Ein Modellteil aus demselben Papier-Stärke-Schaum wie in Beispiel 2 wurde mit einer handelsüblichen Alkohlschlichte überzogen und mit einem konventionellen, nicht-verrottbaren Schaumstoffrohr als Gießlauf versehen. Es wurde eine Vollform hergestellt, die mit Gußeisen mit Kugelgraphit (GGG) abgegossen wurde.A model part made of the same paper-starch foam as in Example 2 was coated with a commercially available alcohol size and provided with a conventional, non-rotting foam tube as a pouring run. A full mold was produced, which was cast with spheroidal graphite cast iron (GGG).

Es konnten oberflächlich weder auf der Schlichte noch auf dem Gußstück Kohlenstoffablagerungen festgestellt werden; im Schliffbild des Gußstücks zeigte sich unter dem Mikroskop eine gute Graphit-Kugelverteilung. Die Kugelgröße nahm vom Rand bis zur Mitte des Gußstücks zu, die Kugelanzahl verhielt sich gegenläufig. Verunreinigungen oder Unregelmäßigkeiten wurden nicht gefunden. Die Oberflächenstruktur des Modellteils wurde sehr gut abgebildet.No carbon deposits could be found on the surface either on the size or on the casting; the micrograph of the casting showed a good graphite ball distribution under the microscope. The size of the balls increased from the edge to the middle of the casting, the number of balls behaved in opposite directions. No contamination or irregularities were found. The surface structure of the model part was mapped very well.

Claims (16)

Modell für das Vollformgießen von Gußstücken, dadurch gekennzeichnet, daß das Modell als einen wesentlichen Bestandteil eine vollständig verrottbare Substanz umfaßt.Model for the full mold casting of castings, characterized in that the model comprises, as an essential component, a completely decomposable substance. Modell nach Anspruch 1, dadurch gekennzeichnet, daß das Modell eine im wesentlichen schaumartige Struktur besitzt.Model according to claim 1, characterized in that the model has an essentially foam-like structure. Modell nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Substanz Stärke, Cellulose und/oder ein Derivat eines dieser Stoffe umfaßt.Model according to claim 1 or 2, characterized in that the substance comprises starch, cellulose and / or a derivative of one of these substances. Modell nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß das Modell zusätzlich ein Schäumungsmittel, ein Bindemittel, ein Gleitmittel, einen Weichmacher und/oder einen Elastizitätsverbesserer umfaßt.Model according to one of claims 1-3, characterized in that the model additionally comprises a foaming agent, a binder, a lubricant, a plasticizer and / or an elasticity improver. Vollform zur Herstellung von Gießstücken, umfassend ein Modell und ein dieses Modell umgebendes Formmaterial, dadurch gekennzeichnet, daß das Modell als einen wesentlichen Bestandteil eine vollständig verrottbare Substanz umfaßt.Full mold for the production of castings, comprising a model and a molding material surrounding this model, characterized in that the model comprises, as an essential component, a completely decomposable substance. Vollform nach Anspruch 5, dadurch gekennzeichnet, daß das Modell eine im wesentlichen schaumartige Struktur besitzt.Full mold according to claim 5, characterized in that the model has an essentially foam-like structure. Vollform nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Substanz Stärke, Cellulose und/oder ein Derivat eines dieser Stoffe umfaßt.Full form according to claim 5 or 6, characterized in that the substance comprises starch, cellulose and / or a derivative of one of these substances. Vollform nach einem der Ansprüche 5-7, dadurch gekennzeichnet, daß das Modell zusätzlich ein Schäumungsmittel, ein Bindemittel, ein Gleitmittel, einen Weichmacher und/oder einen Elastizitätsverbesserer umfaßt.Full mold according to one of claims 5-7, characterized in that the model additionally comprises a foaming agent, a binder, a lubricant, a plasticizer and / or an elasticity improver. Vollform nach einem der Ansprüche 5-8, dadurch gekennzeichnet, daß sie eine keramische Schlichte, vorzugsweise eine Alkoholschlichte umfaßt.Solid form according to one of claims 5-8, characterized in that it comprises a ceramic size, preferably an alcohol size. Verwendung eines Modells, das als einen wesentlichen Bestandteil eine vollständig verrottbare Substanz umfaßt, in einem Vollformgießverfahren.Use of a model, which comprises a completely rotten substance as an essential component, in a full mold casting process. Verwendung einer verrottbaren Substanz als wesentlicher Bestandteil eines Modells für eine Vollform.Use of a rotting substance as an integral part of a model for a full form. Vollformgießverfahren, bei dem flüssiges Metall in eine Vollform gegossen wird, die ein verlorenes Modell enthält, dadurch gekennzeichnet, daß das Modell als einen wesentlichen Bestandteil eine vollständig verrottbare Substanz umfaßt.Full mold casting process, in which liquid metal is poured into a full mold containing a lost model, characterized in that the model comprises, as an essential component, a completely decomposable substance. Vollformgießverfahren nach Anspruch 12, dadurch gekennzeichnet, daß das Modell eine im wesentlichen schaumartige Struktur besitzt.Full mold casting method according to claim 12, characterized in that the model has an essentially foam-like structure. Vollformgießverfahren nach Anspruch 12 oder 13, dadurch gekennzeichnet, daß die Substanz Stärke, Cellulose und/oder ein Derivat eines dieser Stoffe umfaßt.Full mold casting method according to claim 12 or 13, characterized in that the substance comprises starch, cellulose and / or a derivative of one of these substances. Vollformgießverfahren nach einem der Ansprüche 12 - 14, dadurch gekennzeichnet, daß das Modell zusätzlich ein Schäumungsmittel, ein Bindemittel, ein Gleitmittel, einen Weichmacher und/oder einen Elastizitätsverbesserer umfaßt.Solid molding process according to one of claims 12-14, characterized in that the model additionally comprises a foaming agent, a binder, a lubricant, a plasticizer and / or an elasticity improver. Vollformgießverfahren nach einem der Ansprüche 12 - 15, dadurch gekennzeichnet, daß die Vollform eine keramische Schlichte, vorzugsweise eine Alkoholschlichte umfaßt.Full mold casting method according to one of claims 12-15, characterized in that the full mold comprises a ceramic size, preferably an alcohol size.
EP96115425A 1995-10-17 1996-09-26 Pattern and mould for lost pattern casting Expired - Lifetime EP0773079B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19540231 1995-10-17
DE19540231A DE19540231A1 (en) 1995-10-17 1995-10-17 Model and full mold for the full mold casting of castings

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EP0773079A1 true EP0773079A1 (en) 1997-05-14
EP0773079B1 EP0773079B1 (en) 2001-07-04

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AT (1) ATE202734T1 (en)
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351123A (en) * 1963-10-23 1967-11-07 Monsanto Chemicals Mold and process of coating foamed pattern with refractory filler and silicon-containing binder
DE1927538A1 (en) * 1969-05-30 1970-12-03 Baur Dipl Ing Eduard Lost model for plastic molds
GB1338808A (en) * 1970-12-14 1973-11-28 Trw Inc Thermoplastic compositions
JPS5247517A (en) * 1975-10-15 1977-04-15 Janome Sewing Machine Co Ltd Method of manufacturing waterrsoluble model
JPS5475424A (en) * 1977-11-26 1979-06-16 Kawasaki Heavy Ind Ltd Extingish mold for pregision casting and method of casting same
GB2047141A (en) * 1979-04-17 1980-11-26 Steel Castings Res Mould production
US4758613A (en) * 1985-03-26 1988-07-19 Komatsu Haumetto Kabushiki Kaisha Pattern material used for investment casting
US5518537A (en) * 1995-03-14 1996-05-21 M. Argueso & Co., Inc. Filler and wax composition for investment casting

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351123A (en) * 1963-10-23 1967-11-07 Monsanto Chemicals Mold and process of coating foamed pattern with refractory filler and silicon-containing binder
DE1927538A1 (en) * 1969-05-30 1970-12-03 Baur Dipl Ing Eduard Lost model for plastic molds
GB1338808A (en) * 1970-12-14 1973-11-28 Trw Inc Thermoplastic compositions
JPS5247517A (en) * 1975-10-15 1977-04-15 Janome Sewing Machine Co Ltd Method of manufacturing waterrsoluble model
JPS5475424A (en) * 1977-11-26 1979-06-16 Kawasaki Heavy Ind Ltd Extingish mold for pregision casting and method of casting same
GB2047141A (en) * 1979-04-17 1980-11-26 Steel Castings Res Mould production
US4758613A (en) * 1985-03-26 1988-07-19 Komatsu Haumetto Kabushiki Kaisha Pattern material used for investment casting
US5518537A (en) * 1995-03-14 1996-05-21 M. Argueso & Co., Inc. Filler and wax composition for investment casting

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 7721, Derwent World Patents Index; Class A81, AN 77-37222Y, XP002024703 *
DATABASE WPI Section Ch Week 7930, Derwent World Patents Index; Class A88, AN 79-55403B, XP002024704 *

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ATE202734T1 (en) 2001-07-15
DE59607210D1 (en) 2001-08-09
DE19540231A1 (en) 1997-04-24
EP0773079B1 (en) 2001-07-04

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