EP2489449B1 - Feeder with exothermic feeder body and external insulation jacket - Google Patents

Feeder with exothermic feeder body and external insulation jacket Download PDF

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Publication number
EP2489449B1
EP2489449B1 EP11001338.0A EP11001338A EP2489449B1 EP 2489449 B1 EP2489449 B1 EP 2489449B1 EP 11001338 A EP11001338 A EP 11001338A EP 2489449 B1 EP2489449 B1 EP 2489449B1
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EP
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Prior art keywords
feeder
sleeve
exothermic
feeder body
insulating
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EP11001338.0A
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German (de)
French (fr)
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EP2489449A1 (en
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Thomas Baginski
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GTP Schaefer Giesstechnishe Produkte GmbH
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GTP Schaefer Giesstechnishe Produkte GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088—Feeder heads

Definitions

  • the invention relates to a feeder for insertion into a mold used in the casting of metals, comprising a feeder cavity enclosing feeder body consisting of a circumferential side wall, a lid portion and a feeder opening as a connection to the mold cavity having bottom portion, wherein the feeder body of an exothermic and contact heat with the hot metal rising in the riser cavity during the casting process, and enclosed on its outside by a shell made of an insulating refractory material, a refracting core consisting of a refractory material being disposed at the bottom of the feeder.
  • a feeder with the aforementioned features is in the DE 10 2007 012 117 A1 described.
  • the so-called modulus of the feeder defined as the ratio of the volume of the feeder cavity to the surface of the feeder, should be greater than the modulus of the casting to be cast.
  • the feeder body consists of an exothermic material, such as an aluminothermic Mixture. Such a material is ignited by the liquid metal entering the riser cavity, and therefore an exothermic reaction occurs following the rise of the liquid metal into the riser cavity through which heat is supplied to the metal in the riser cavity.
  • the feeder body made of the exothermic material is enclosed on its outside by a shell made of an insulating refractory material, and the insulating refractory material may be made of, for example, quartz sand as the refractory material with an added amount of aluminum silicate microbubbles as the insulating material.
  • the insulating refractory material may be made of, for example, quartz sand as the refractory material with an added amount of aluminum silicate microbubbles as the insulating material.
  • a gap is left between the feeder body and the outer shell as Isolierhohlraum.
  • the Brochkern extends over the entire bottom surface of the feeder body and this enclosing shell formed feeder.
  • a feeder is known whose existing of an exothermic material feeder body is enclosed by an existing of an insulating material sheath, which bears against the feeder body.
  • a breaker core is not present in the far known feeder.
  • a feeder with a comparable structure also results from the FR 2 648 373 A1 ; As far as this feeder a breaker core is provided, this seals in accordance with the prior art according to the DE 10 2007 012 117 A1 the entire bottom of the existing exothermic material feeder body and enclosing this, consisting of an insulating material shell.
  • the exothermic material is an oxidizable metal and an oxidizing agent, which can produce an exothermic reaction, including, it is already proposed to add components of an insulating refractory material to the exothermic material, so that there is an exothermic insulating material mixture.
  • the present invention seeks to improve a feeder with the aforementioned generic features in terms of its insulating effect yet.
  • the invention provides a feeder having the generic features in which the shell surrounding the feeder body, consisting of the insulating refractory material, extends over the refracting core consisting of the refractory material and extends as far as the footprint of the feeder on the casting model that the breaker core and the connection opening formed in it are covered by the additional insulating effect of the outer shell.
  • the invention thus has the advantage that the refracting core consisting of the refractory material is included in the insulating effect of the outer shell.
  • an insulating shell or the insulating shell can thereby abut directly on the outer surface of the consisting of exothermic material feeder body, or it may be an air gap formed therebetween, which causes additional insulation of the existing exothermic material feeder body.
  • a layer of a heat-reflecting material preferably an aluminum foil, is arranged between the feeder body and its outer shell.
  • a layer of a heat-reflecting material preferably an aluminum foil
  • the feeder body is completely enclosed by its side walls and its lid portion of the shell.
  • the out FIG. 1 apparent feeder 10 has a feeder body 11, which consists of a per se known exothermic material.
  • the exothermic feeder body 11 forms in its interior from a side wall 13 and a lid portion 14 enclosed feeder cavity 12.
  • a feeder opening 16 is formed in the bottom region 15 of the feeder body 11.
  • a metallic Feiserfuß 17 is additionally attached, as shown in the DE 201 12 425 U1 is known, the function of which is described in the aforementioned document.
  • Side wall 13 and lid portion 14 are in the in FIG. 1 illustrated embodiment of an outer shell 18 formed of an insulating material completely enclosed.
  • FIG. 1 illustrated feeder is placed on a casting model for the production of the mold, wherein the casting model including attached thereto riser of compacted molded sand is enclosed, so that after removal of the casting model from the mold remains to be filled during the casting process with the liquid cavity mold cavity.
  • the liquid metal introduced into the mold cavity of the mold rises into the feeder cavity 12 via the feeder foot 17 and the feeder orifice 16 and comes into contact with the feeder body 11 made of exothermic material so as to become an exothermic reaction at least partial combustion of the feeder body 11 comes.
  • the heat contained in the liquid metal and provided by the exothermic reaction is isolated by the outer, insulating material shell 18 against heat transfer in the molding sand surrounding the feeder, so that the overall heat balance of the feeder is improved for the feeding process. Due to the additionally provided by the arrangement of the outer shell isolation effect, the proportion of the exothermic material to form the feeder body 11 can be reduced in comparison with conventional, consisting only one feeder body of exothermic material feeders, without reducing the module of the feeder with the same size dimension , If, on the other hand, the feeder dimensions of a feeder having only one feeder body made of exothermic material are taken over unchanged, the module of a geometrically unchanged feeder can be enlarged by forming the feeder with a feeder body consisting of an exothermic material and an outer shell consisting of insulating material.
  • FIG. 2 illustrated embodiment differs from that FIG. 1 described embodiment first in that instead of the metallic Feiserfußes now consisting of a refractory material refractive core is arranged, as it is also part of a feeder from the generic type EP 1 184 104 B1 results.
  • the outer, consisting of the insulating material shell 18 extends beyond the breaker core 20 away, so that the breaker core 20 and the connection opening 21 formed in it are covered by the additional insulating effect of the outer shell 18.
  • an aluminum foil 25 is arranged to improve the insulating effect.
  • the inclusion of the cover region 14 of the feeder body 11 in the outer, insulating shell 18 is dispensed with, so that in the cover region 14 there is a contact of the feeder 10 with the molding sand surrounding it.
  • a partial enclosure of the feeder body 11 with the outer insulating shell 18 is sufficient, as a result of the incomplete filling of the feeder cavity 12 with the liquid metal in the lid portion 14 hardly sets an exothermic reaction and therefore Additional insulation is not essential in this area.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Description

Die Erfindung betrifft einen Speiser zum Einsetzen in eine beim Gießen von Metallen verwendete Gießform, mit einem einen Speiserhohlraum umschlie-ßenden Speiserkorpus, bestehend aus einer umlaufenden Seitenwand, einem Deckelbereich sowie einem eine Speiseröffnung als Verbindung zum Formhohlraum aufweisenden Bodenbereich, wobei der Speiserkorpus aus einem exothermen und bei Kontakt mit dem heißen, beim Gießprozess in den Speiserhohlraum aufsteigenden Metall hitzeerzeugend verbrennenden Material besteht und auf seiner Außenseite von einer aus einem isolierenden feuerfesten Material bestehenden Schale umschlossen ist, wobei am Bodenbereich des Speisers ein aus einem feuerfesten Material bestehender Brechkern angeordnet ist.The invention relates to a feeder for insertion into a mold used in the casting of metals, comprising a feeder cavity enclosing feeder body consisting of a circumferential side wall, a lid portion and a feeder opening as a connection to the mold cavity having bottom portion, wherein the feeder body of an exothermic and contact heat with the hot metal rising in the riser cavity during the casting process, and enclosed on its outside by a shell made of an insulating refractory material, a refracting core consisting of a refractory material being disposed at the bottom of the feeder.

Ein Speiser mit den vorgenannten Merkmalen ist in der DE 10 2007 012 117 A1 beschrieben. Damit das beim Gießvorgang in den Speiserhohlraum eintretende flüssige Metall später erstarrt als das Metall des Gussstücks, soll der sogenannte Modul des Speisers, definiert als Verhältnis von Volumen des Speiserhohlraums zur Oberfläche des Speisers, größer sein als der Modul des abzugießenden Gussstücks. Um die spätere Erstarrung des in den Speiserhohlraum eintretenden flüssigen Metalls zu gewährleisten, besteht der Speiserkorpus aus einem exothermen Material, beispielsweise einer aluminothermischen Mischung. Ein solches Material wird durch das in den Speiserhohlraum eintretende flüssige Metall gezündet, und es läuft deshalb im Anschluss an das Aufsteigen des flüssigen Metalls in den Speiserhohlraum eine exotherme Reaktion ab, durch die dem im Speiserhohlraum befindlichen Metall Wärme zugeführt wird. Dieses bleibt aufgrund der Wärmezufuhr länger flüssig als das im Formhohlraum der Gießform anstehende Metall und ist dadurch für die Rückspeisung in den Formhohlraum nutzbar. Zusätzlich ist der aus dem exothermen Material bestehende Speiserkorpus auf seiner Außenseite von einer aus einem isolierenden feuerfesten Material bestehenden Schale umschlossen, wobei das isolierende feuerfeste Material beispielsweise aus Quarzsand als dem feuerfesten Material mit einem beigegebenen Anteil an Aluminiumsilikatmikrohohlkugeln als isolierendem Material bestehen kann. Bei dem bekannten Speiser ist zwischen dem Speiserkorpus und der äußeren Schale ein Zwischenraum als Isolierhohlraum belassen. Soweit bei dem bekannten Speiser weiterhin zwischen dem Speiserkorpus und dem Gießmodell ein aus einem feuerfesten Material, wie Quarzsand, bestehender Brechkern angeordnet ist, erstreckt sich der Brochkern über die gesamte Bodenfläche des aus Speiserkorpus und der diesen umschließenden Schale gebildeten Speisers.A feeder with the aforementioned features is in the DE 10 2007 012 117 A1 described. In order for the liquid metal entering the feeder cavity during casting to solidify later than the metal of the casting, the so-called modulus of the feeder, defined as the ratio of the volume of the feeder cavity to the surface of the feeder, should be greater than the modulus of the casting to be cast. In order to ensure the subsequent solidification of the entering into the feeder cavity liquid metal, the feeder body consists of an exothermic material, such as an aluminothermic Mixture. Such a material is ignited by the liquid metal entering the riser cavity, and therefore an exothermic reaction occurs following the rise of the liquid metal into the riser cavity through which heat is supplied to the metal in the riser cavity. This remains due to the heat longer liquid than the pending in the mold cavity of the mold metal and is thus usable for the return feed into the mold cavity. In addition, the feeder body made of the exothermic material is enclosed on its outside by a shell made of an insulating refractory material, and the insulating refractory material may be made of, for example, quartz sand as the refractory material with an added amount of aluminum silicate microbubbles as the insulating material. In the known feeder, a gap is left between the feeder body and the outer shell as Isolierhohlraum. As far as in the known feeder continues between the feeder body and the casting model of a refractory material, such as quartz sand, existing breaker core is arranged, the Brochkern extends over the entire bottom surface of the feeder body and this enclosing shell formed feeder.

Mit dem bekannten Speiser ist der Nachteil verbunden, dass beim Gießvorgang im Bereich des Brechkerns noch ein nicht-unerheblicher Wärmeabfluss eintreten kann, so dass insbesondere in der letzten Phase des Speisevorganges das Rückfließen von flüssigem Metall aus dem Speiserhohlraum in den Formhohlraum der Gießform nicht in ausreichendem Maße erfolgen kann.With the known feeder has the disadvantage that during the casting process in the region of the breaker core still a significant heat loss may occur, so that in particular in the last phase of the feeding process, the backflow of liquid metal from the feeder cavity into the mold cavity of the mold in sufficient Measurements can be made.

Aus der WO 00/27560 A1 ist weiterhin ein Speiser bekannt, dessen aus einem exothermen Material bestehender Speiserkorpus von einer aus einem isolierenden Material bestehenden Hülle umschlossen ist, die an dem Speiserkorpus anliegt. Ein Brechkern ist bei dem insoweit bekannten Speiser nicht vorhanden. Ein Speiser mit einem vergleichbaren Aufbau ergibt sich ebenfalls aus der FR 2 648 373 A1 ; soweit bei diesem Speiser ein Brechkern vorgesehen ist, dichtet dieser in Übereinstimmung mit dem Stand der Technik nach der DE 10 2007 012 117 A1 die gesamte Unterseite des aus exothermem Material bestehenden Speiserkorpus und der diesen umschließenden, aus einem isolierenden Material bestehenden Schale ab.From the WO 00/27560 A1 Furthermore, a feeder is known whose existing of an exothermic material feeder body is enclosed by an existing of an insulating material sheath, which bears against the feeder body. A breaker core is not present in the far known feeder. A feeder with a comparable structure also results from the FR 2 648 373 A1 ; As far as this feeder a breaker core is provided, this seals in accordance with the prior art according to the DE 10 2007 012 117 A1 the entire bottom of the existing exothermic material feeder body and enclosing this, consisting of an insulating material shell.

Der EP 0 888 199 B1 sind beispielsweise geeignete Materialmischungen zu entnehmen. Danach soll das exotherme Material ein oxidierbares Metall und ein Oxidationsmittel, welches eine exotherme Reaktion erzeugen kann, beinhalten, wobei auch bereits vorgeschlagen ist, dem exothermen Material Bestandteile eines isolierenden feuerfesten Materials zuzusetzen, so dass sich eine exotherm-isolierende Materialmischung ergibt.Of the EP 0 888 199 B1 For example, suitable material mixtures can be taken. Thereafter, the exothermic material is an oxidizable metal and an oxidizing agent, which can produce an exothermic reaction, including, it is already proposed to add components of an insulating refractory material to the exothermic material, so that there is an exothermic insulating material mixture.

Weiterhin sind gemäß der EP 1 184 104 B1 auch rein isolierende Speiser bekannt, deren Speiserkorpus ausschließlich aus einem isolierenden Material besteht. Im Gegensatz zu aus exothermem Material bestehenden Speisern ist mangels einer aktiven Wärmezufuhr während des Gießprozesses der Wärmehaushalt dieser reinen Isolierspeiser schlechter, und die Einsatzmöglichkeiten derartiger reiner Isolierspeiser sind demzufolge beschränkt.Furthermore, according to the EP 1 184 104 B1 Also known as purely insulating feeders whose feeder body consists exclusively of an insulating material. In contrast to consisting of exothermic material feeders is the absence of active heat during the casting process, the heat balance of these pure Isolierspeiser worse, and the applications of such pure Isolierspeiser are therefore limited.

In der WO 2008/003478 A1 ist vorgeschlagen, die den Speiserhohlraum umschließende Wandung eines im wesentlichen aus exothermem Material bestehenden Speisers mit einer Schicht aus einem isolierenden Material auszukleiden, welche beim Eintreten des flüssigen Metalls in den Speiserhohlraum einen unmittelbaren Kontakt zwischen dem flüssigen Metall und dem exothermem Material und damit eine schockartige Abkühlung des flüssigen Metalls an der Oberfläche des exothermem Materials und somit die Bildung einer dünnen Haut in diesem Bereich verhindert.In the WO 2008/003478 A1 It is proposed to line the cavity surrounding the feeder cavity of a feeder consisting essentially of exothermic material with a layer of an insulating material which, upon entry of the liquid metal into the feeder cavity, provides direct contact between the liquid metal and the exothermic material and thus shock-like cooling the liquid metal on the surface of the exothermic material and thus prevents the formation of a thin skin in this area.

Angesichts des vorstehend dargelegten Standes der Technik liegt der Erfindung der Aufgabe zugrunde, einen Speiser mit den eingangs genannten, gattungsgemäßen Merkmalen im Hinblick auf seine Isolierwirkung noch zu verbessern.In view of the above-described prior art, the present invention seeks to improve a feeder with the aforementioned generic features in terms of its insulating effect yet.

Die Lösung dieser Aufgabe ergibt sich aus dem Anspruch 1; vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.The solution to this problem arises from the claim 1; advantageous embodiments and modifications of the invention are specified in the dependent claims.

Die Erfindung sieht im Einzelnen einen Speiser mit den gattungsgemäßen Merkmalen vor, bei welchem die den Speiserkorpus umschließende, aus dem isolierenden feuerfesten Material bestehende Schale sich über den aus dem feuerfesten Material bestehenden Brechkern erstreckt und bis an die Aufstandsfläche des Speisers auf dem Gießmodell reicht, so dass der Brechkern und die in ihm ausgebildete Verbindungsöffnung von der zusätzlichen Isolierwirkung der äußeren Schale erfasst sind. Mit der Erfindung ist somit der Vorteil verbunden, dass der aus dem feuerfesten Material bestehende Brechkern in die Isolierwirkung der äußeren Schale einbezogen ist.Specifically, the invention provides a feeder having the generic features in which the shell surrounding the feeder body, consisting of the insulating refractory material, extends over the refracting core consisting of the refractory material and extends as far as the footprint of the feeder on the casting model that the breaker core and the connection opening formed in it are covered by the additional insulating effect of the outer shell. The invention thus has the advantage that the refracting core consisting of the refractory material is included in the insulating effect of the outer shell.

Nach Ausführungsbeispiolen der Erfindung kann eine isolierende Schale beziehungsweise kann die Isolierschale dabei unmittelbar an der Außenfläche des aus exothermen Material bestehenden Speiserkorpus anliegen, oder es kann ein Luftspalt dazwischen ausgebildet sein, der eine zusätzliche Isolierung des aus exothermem Material bestehenden Speiserkorpus bewirkt.According to embodiments of the invention, an insulating shell or the insulating shell can thereby abut directly on the outer surface of the consisting of exothermic material feeder body, or it may be an air gap formed therebetween, which causes additional insulation of the existing exothermic material feeder body.

Nach einem Ausführungsbeispiel der Erfindung kann vorgesehen sein, dass zwischen dem Speiserkorpus und dessen äußerer Schale eine Schicht aus einem wärmereflektierenden Material, vorzugsweise eine Aluminiumfolie, angeordnet ist. Hierdurch wird die Isolationswirkung der äußeren Schale noch verstärkt.According to an exemplary embodiment of the invention, it can be provided that a layer of a heat-reflecting material, preferably an aluminum foil, is arranged between the feeder body and its outer shell. As a result, the insulating effect of the outer shell is reinforced.

Hinsichtlich der geometrischen Ausbildung der aus dem isolierenden Material bestehenden Schale in Bezug auf den aus exotherme Material bestehenden Speiserkorpus kann nach einem Ausführungsbeispiel der Erfindung vorgesehen sein, dass der Speiserkorpus mit seinen Seitenwänden und seinem Deckelbereich vollständig von der Schale umschlossen ist.With regard to the geometric configuration of the existing of the insulating material shell with respect to the consisting of exothermic material feeder body according to an embodiment of the invention can be provided that the feeder body is completely enclosed by its side walls and its lid portion of the shell.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung wiedergegeben, welches nachstehend beschrieben ist. Es zeigen:

Fig. 1
einen nicht der Erfindung entsprechenden, weil einen metallischen Speiserfuß aufweisenden Speiser mit einem aus einem exothermen Material bestehenden Speiserkorpus und einer äußeren, aus isolierendem Material bestehenden Schale in einer schematischen Schnittdarstellung,
Fig. 2
eine erfindungsgemäße Ausführungsform des in Figur 1 dargestellten Speisers mit einem von der äußeren Schale umschlossenen Brechkern.
In the drawing, an embodiment of the invention is reproduced, which is described below. Show it:
Fig. 1
a feeder having a metallic Feiserfuß with a consisting of an exothermic material feeder body and an outer shell made of insulating material in a schematic sectional view, not according to the invention.
Fig. 2
an embodiment of the invention in FIG. 1 shown feeder with an enclosed by the outer shell breaker core.

Der aus Figur 1 ersichtliche Speiser 10 weist einen Speiserkorpus 11 auf, der aus einem an sich bekannten exothermen Material besteht. Der exotherme Speiserkorpus 11 bildet in seinem Inneren einen von einer Seitenwand 13 und einem Deckelbereich 14 umschlossenen Speiserhohlraum 12 aus. In dem Bodenbereich 15 des Speiserkorpus 11 ist eine Speiseröffnung 16 ausgebildet. An dem Bodenbereich 16 ist zusätzlich ein metallischer Speiserfuß 17 angebracht, wie er aus der DE 201 12 425 U1 bekannt ist, wobei dessen Funktion in der vorgenannten Druckschrift beschrieben ist. Seitenwand 13 und Deckelbereich 14 sind bei dem in Figur 1 dargestellten Ausführungsbeispiel von einer aus einem isolierenden Material gebildeten äußeren Schale 18 vollständig umschlossen.The out FIG. 1 apparent feeder 10 has a feeder body 11, which consists of a per se known exothermic material. The exothermic feeder body 11 forms in its interior from a side wall 13 and a lid portion 14 enclosed feeder cavity 12. In the bottom region 15 of the feeder body 11, a feeder opening 16 is formed. At the bottom portion 16, a metallic Feiserfuß 17 is additionally attached, as shown in the DE 201 12 425 U1 is known, the function of which is described in the aforementioned document. Side wall 13 and lid portion 14 are in the in FIG. 1 illustrated embodiment of an outer shell 18 formed of an insulating material completely enclosed.

Ein in Figur 1 dargestellter Speiser wird zur Herstellung der Gießform auf ein Gießmodell aufgesetzt, wobei das Gießmodell einschließlich daran angesetzter Speiser von verdichtet eingebrachtem Formsand umschlossen wird, so dass nach Entnahme des Gießmodells aus der Gießform der beim Gießvorgang mit dem flüssigen Hohlraum auszufüllende Formhohlraum verbleibt. Während des Gießprozesses steigt das in den Formhohlraum der Gießform eingefüllte flüssige Metall über den Speiserfuß 17 und die Speiseröfffnung 16 in den Speiserhohlraum 12 und gelangt hier in Kontakt mit dem aus exothermen Material bestehenden Speiserkorpus 11, so dass es aufgrund der dadurch eintretenden exothermen Reaktion zu einer mindestens teilweisen Verbrennung des Speiserkorpus 11 kommt. Die in dem flüssigen Metall enthaltene und durch die exotherme Reaktion zur Verfügung gestellte Wärme wird durch die äußere, aus Isoliermaterial bestehende Schale 18 gegen einen Wärmeübergang indem den Speiser umschließenden Formsand isoliert, so dass der Wärmehaushalt des Speisers insgesamt für den Speisevorgang verbessert wird. Aufgrund der zusätzlich durch die Anordnung der äußeren Schale vermittelten Isolationswirkung kann der Anteil des exothermen Materials zur Ausbildung des Speiserkorpus 11 im Vergleich mit herkömmlichen, lediglich einen Speiserkorpus aus exothermen Material bestehenden Speisern verringert werden, ohne dass sich der Modul des Speisers bei gleich bleibender Größenabmessung verringert. Werden hingegen die Speiserabmessungen eines lediglich einen aus exothermen Material bestehenden Speiserkorpus aufweisenden Speisers unverändert übernommen, so kann der Modul eines geometrisch unveränderten Speisers durch die Ausbildung des Speisers mit einem aus exothermen Material bestehenden Speiserkorpus und einer aus isolierendem Material bestehenden äußeren Schale 18 vergrößert werden.An in FIG. 1 illustrated feeder is placed on a casting model for the production of the mold, wherein the casting model including attached thereto riser of compacted molded sand is enclosed, so that after removal of the casting model from the mold remains to be filled during the casting process with the liquid cavity mold cavity. During the casting process, the liquid metal introduced into the mold cavity of the mold rises into the feeder cavity 12 via the feeder foot 17 and the feeder orifice 16 and comes into contact with the feeder body 11 made of exothermic material so as to become an exothermic reaction at least partial combustion of the feeder body 11 comes. The heat contained in the liquid metal and provided by the exothermic reaction is isolated by the outer, insulating material shell 18 against heat transfer in the molding sand surrounding the feeder, so that the overall heat balance of the feeder is improved for the feeding process. Due to the additionally provided by the arrangement of the outer shell isolation effect, the proportion of the exothermic material to form the feeder body 11 can be reduced in comparison with conventional, consisting only one feeder body of exothermic material feeders, without reducing the module of the feeder with the same size dimension , If, on the other hand, the feeder dimensions of a feeder having only one feeder body made of exothermic material are taken over unchanged, the module of a geometrically unchanged feeder can be enlarged by forming the feeder with a feeder body consisting of an exothermic material and an outer shell consisting of insulating material.

Das in Figur 2 dargestellte Ausführungsbeispiel unterscheidet sich von dem zu Figur 1 beschriebenen Ausführungsbeispiel zunächst dadurch, dass anstelle des metallischen Speiserfußes nun ein aus einem feuerfesten Material bestehender Brechkern angeordnet ist, wie er sich als Bestandteil eines Speisers auch aus der gattungsbildenden EP 1 184 104 B1 ergibt. Bei dem in Figur 2 dargestellten Ausführungsbeispiel erstreckt sich die äußere, aus dem isolierenden Material bestehenden Schale 18 bis über den Brechkern 20 hinweg, so dass auch der Brechkern 20 und die in ihm ausgebildete Verbindungsöffnung 21 von der zusätzlichen Isolierwirkung der äußeren Schale 18 erfasst sind. Zwischen dem Speiserkorpus 11 und der äußeren Schale 18 ist eine Aluminiumfolie 25 zur Verbesserung der Isolierwirkung angeordnet. Bei diesem Ausführungsbeispiel ist auf die Einbeziehung des Deckelbereichs 14 des Speiserkorpus 11 in die äußere, isolierende Schale 18 verzichtet, so dass im Deckelbereich 14 ein Kontakt des Speisers 10 mit dem diesen umschließenden Formsand besteht. Je nach der Berechnung des für den Gießvorgang erforderlichen Wärmehaushaltes ist eine solche teilweise Umhüllung des Speiserkorpus 11 mit der äußeren Isolierschale 18 ausreichend, soweit sich aufgrund der nicht vollständigen Befüllung des Speiserhohlraumes 12 mit dem flüssigen Metall im Deckelbereich 14 kaum eine exotherme Reaktion einstellt und daher auch in diesem Bereich eine zusätzliche Isolierung nicht unbedingt erforderlich ist.This in FIG. 2 illustrated embodiment differs from that FIG. 1 described embodiment first in that instead of the metallic Feiserfußes now consisting of a refractory material refractive core is arranged, as it is also part of a feeder from the generic type EP 1 184 104 B1 results. At the in FIG. 2 illustrated embodiment, the outer, consisting of the insulating material shell 18 extends beyond the breaker core 20 away, so that the breaker core 20 and the connection opening 21 formed in it are covered by the additional insulating effect of the outer shell 18. Between the feeder body 11 and the outer shell 18, an aluminum foil 25 is arranged to improve the insulating effect. In this embodiment, the inclusion of the cover region 14 of the feeder body 11 in the outer, insulating shell 18 is dispensed with, so that in the cover region 14 there is a contact of the feeder 10 with the molding sand surrounding it. Depending on the calculation of the heat budget required for the casting process, such a partial enclosure of the feeder body 11 with the outer insulating shell 18 is sufficient, as a result of the incomplete filling of the feeder cavity 12 with the liquid metal in the lid portion 14 hardly sets an exothermic reaction and therefore Additional insulation is not essential in this area.

Claims (6)

  1. A feeder (10) for insertion into a mould used for casting metals, having a feeder body (11) enclosing a feeder cavity (12), consisting of a circumferential side wall (13), a top region (14) as well as a base region (15) comprising a feeder opening (16) acting as the connection with the mould cavity, wherein the feeder body (11) consists of an exothermic material which incinerates to produce heat in contact with the hot metal rising in the feeder cavity (12) during the casting process and the outside of which is enclosed by a sleeve (18) consisting of an insulating refractory material, wherein a breaker core (20) consisting of a refractory material is disposed at the base region (15) of the feeder (10), characterized in that the sleeve (18) consisting of the insulating refractory material enclosing the feeder body (11) extends over the breaker core (20) consisting of the refractory material and reaches up to the contact surface of the feeder (10) on a casting pattern forming the mould so that the additional insulating action of the outer sleeve (18) extends to cover the breaker core (20) and the connecting opening (21) formed therein.
  2. The feeder as claimed in claim 1, characterized in that the sleeve (18) is placed directly on the outer surface of the feeder body (11) consisting of exothermic material.
  3. The feeder as claimed in claim 1, characterized in that an air gap is left between the outer surface of the feeder body (11) consisting of exothermic material and the sleeve (18) around the outside thereof.
  4. The feeder as claimed in claim 1, characterized in that a layer formed from a heat-reflective material is disposed between the feeder body (11) and the sleeve (18).
  5. The feeder as claimed in claim 4, characterized in that an aluminium foil (25) is disposed between the feeder body (11) and the sleeve (18).
  6. The feeder as claimed in one of claims 1 to 5, characterized in that the mixture of Materials of the feeder body (11) consisting of exothermic material does not contain any proportions of insulating material.
EP11001338.0A 2011-02-18 2011-02-18 Feeder with exothermic feeder body and external insulation jacket Active EP2489449B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11001338.0A EP2489449B1 (en) 2011-02-18 2011-02-18 Feeder with exothermic feeder body and external insulation jacket

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11001338.0A EP2489449B1 (en) 2011-02-18 2011-02-18 Feeder with exothermic feeder body and external insulation jacket

Publications (2)

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EP2489449A1 EP2489449A1 (en) 2012-08-22
EP2489449B1 true EP2489449B1 (en) 2015-12-02

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2925466B1 (en) 2012-11-29 2018-03-14 GTP-Schäfer Giesstechnische Produkte GmbH Method for producing a feeder having an exothermic feeder body and an insulating external shell
DE102015103593B3 (en) * 2015-03-11 2016-05-12 GTP Schäfer Gießtechnische Produkte GmbH Process for producing a feeder insert having both exothermic and insulating regions
CN105382241A (en) * 2015-12-30 2016-03-09 上海爱仕达汽车零部件有限公司 Casting process of oil separator box body
EP3756787B1 (en) 2019-06-24 2022-05-04 GTP Schäfer Gießtechnische Produkte GmbH Feeder insert with sleeve
EP3756788A1 (en) 2019-06-24 2020-12-30 GTP Schäfer Gießtechnische Produkte GmbH Feeder insert with outer contour having recesses and protrusions

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2648373B1 (en) * 1989-06-14 1994-04-01 Daussan Cie FOUNDRY POT
BR9601454C1 (en) 1996-03-25 2000-01-18 Paulo Roberto Menon Process for the production of exothermic and insulating gloves.
AU1472400A (en) * 1998-11-10 2000-05-29 Ashland Inc. Multiple layered sleeves and their uses
DE10039519B4 (en) 2000-08-08 2007-05-31 Chemex Gmbh feeder sleeve
DE20112425U1 (en) 2001-07-27 2001-10-18 GTP Schäfer Gießtechnische Produkte GmbH, 41515 Grevenbroich Feeder insert with metallic feeder foot
DE102006030875A1 (en) 2006-07-04 2008-01-10 AS Lüngen GmbH & Co. KG Feeder with insulating insert
DE102007012117A1 (en) * 2007-03-13 2008-09-18 AS Lüngen GmbH Feeder for producing cast metal pieces in a foundry comprises a feeder head having an insulating hollow chamber arranged around the periphery of an equalizing hollow chamber

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EP2489449A1 (en) 2012-08-22

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