EP3138642B1 - Feeder comprising a netlike tissue spanning its feeder opening - Google Patents

Feeder comprising a netlike tissue spanning its feeder opening Download PDF

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Publication number
EP3138642B1
EP3138642B1 EP16183481.7A EP16183481A EP3138642B1 EP 3138642 B1 EP3138642 B1 EP 3138642B1 EP 16183481 A EP16183481 A EP 16183481A EP 3138642 B1 EP3138642 B1 EP 3138642B1
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EP
European Patent Office
Prior art keywords
feeder
frame
netlike
feeder body
webbing
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EP16183481.7A
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German (de)
French (fr)
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EP3138642A1 (en
Inventor
Jörg Schäfer
Thomas Schäfer
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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
    • 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

Definitions

  • the invention relates to a feeder in the form of a head feeder for insertion into a casting mold used in the casting of metals, consisting of an inner cavity as a feeder volume enclosing, consisting of an exothermic and / or insulating material feeder body, which in its mold cavity formed in the mold facing bottom surface has a feeder opening for connecting the inner cavity of the feeder body with the mold cavity of the mold during the casting process, wherein on the feeder body is arranged a feeder opening spanning net-like, consisting of a refractory material tissue.
  • the feeders In the foundry industry, it is often necessary to arrange additional feeders in the molds, whose feeder body fills with the casting of the casting with the liquid metal and compensates for volume deficits occurring during the solidification of the casting, in order to prevent voids formation in the casting.
  • the feeders must be such that the liquid metal fed therein solidifies later than the casting, so that during the solidification process, a material transport can take place towards the casting, which tightly feeds the casting.
  • the feeders consist of an exothermic and / or insulating material or are shaped as so-called natural feeders in the mold sand enclosing the casting model.
  • the feeders are arranged with any geometric shape at the point to be fed the later casting on the casting model and molded or formed during the preparation of the mold by compaction of the introduced molding sand.
  • the feeders are arranged as so-called head feeders regularly on the G confusemodellober Structure or on the later Guswin.
  • Such a feeder is for example from the DE 20 2013 104 863 U1 known.
  • the refractive cores usually produced by shooting in a shooting machine are disc-shaped, wherein the passage opening is formed by a constriction formed in the disc-shaped crusher core body, thereby to create a predetermined breaking point for breaking the riser from the surface of the casting.
  • Such an arrangement of the feeder with a breaker core is for example from the WO 2009/103539 A1 known.
  • a head feeder with the aforementioned generic features is known in which a spanning the feeder opening, consisting of a gas-poor refractory material tissue is nailed or glued to the feeder body.
  • a breaker core for feeders of cast aluminum pieces which consists of a grid of intersecting glass fiber bundles, mineral fiber bundles or preferably melt-repellent coated metal wires, which is glued to the feeder body or formed in the manufacture of the feeder to the feeder body.
  • the invention has for its object to improve a feeder with the aforementioned generic features to the effect that the occurrence of remaining after casting on the casting and to be eliminated by cleaning metal residues is further limited.
  • the invention provides for this purpose a feeder with the features mentioned, in which on the feeder body an existing of a heat-resistant material annular frame is fixed with the net-like fabric spanned therein, wherein the frame is arranged on the bottom surface of the feeder body such that the net-like In the case of a feeder formed in the casting mold, tissue is positioned directly on the surface of the casting formed by the casting.
  • the invention has the significant advantage that due to the arrangement of the frame with the net-like tissue held by him the bottom surface of the feeder is the level of the net-like fabric located in the lower, resting on the casting model bottom surface of the feeder, so that the predetermined breaking point formed by the net-like fabric for breaking the feeder remainder is directly displaced to the surface of the casting. Thus, hardly any additional cleaning effort.
  • a further advantage is that the frame with the net-like fabric is easier to produce than a conventional break core with a net arranged therein.
  • the arrangement of the frame allows a corresponding Tension and retention of the net-like fabric in the frame.
  • the use of a frame made of a heat-resistant material for holding the tensioned net-like fabric also has the advantage that the frame is not melted by the hot metal flowing through the breaker core and therefore no harmful for the casting process combustion gases.
  • the frame consists of two mutually juxtaposed and the net-like tissue between them receiving subframe, which can be fixed against each other after application of the required tension of the net-like fabric, the subframe welded to their mutual determination, in particular to individual Points can be spot-welded.
  • the width of the frame corresponds to the material thickness of the feeder body at its bottom surface and the frame is placed on the bottom surface of the feeder body and fixed to the feeder body, this determination being made for example by a clamping connection of frame and feeder body or by gluing can.
  • the frame protrudes at least in regions outwardly beyond the circumference of the feeder body and the projecting portion of the frame is bent up to the outer periphery of the feeder body when placed on the bottom surface frame, so that the bent portion of the frame on the Clamps feeder body. It is not necessary that the frame is jammed on its entire circumference with the feeder body, but it is sufficient if the frame distributed over its circumference a plurality of over the Having feeder body protruding and up to fix the frame to the feeder body tongues.
  • the frame is glued to the bottom surface of the feeder body.
  • the net-like fabric to reduce the flow resistance has a through hole with a smaller dimension than the passage opening of the refractive core.
  • the through hole has an area of 10 to 50 percent of the area enclosed by the frame surface of the passage opening of the refractive core, wherein the network width, that is, the width of the network openings, 1 to 20 millimeters a width of the network structure forming threads of 1 to 15 millimeters.
  • the frame may be made of metal as the refractory material. Since the underside of the frame facing away from the feeder can come into contact with the liquid metal from the side of the casting mold or from its mold cavity, the casting could bond to the frame because of the heat of the liquid metal, which in turn makes separation of the feeder remainder difficult would. Therefore, with the use of metal as the material for the production of the frame is provided that the mold cavity-facing bottom of the frame is provided with a refractory coating. For this purpose, for example, a refractory Kokillenschlichte can be used.
  • the frame may be made of ceramic or a refractory material as each heat-resistant material.
  • the out Fig. 1 apparent feeder 10 has a feeder body 11 which comprises a wall portion 13 enclosing an inner cavity 12 as a so-called feeder volume and an upper lid portion 14.
  • the lid region 14 is opposite to a lower bottom surface 15 in which a feeder opening 16 is formed.
  • the feeder orifice 16 when the feeder 10 is molded into the mold, makes the connection between the inner cavity 12 of the feeder body and the mold cavity formed in the mold such that during the molding process, the liquid metal introduced into the mold cavity enters the inner cavity 12 through the feeder orifice 16 and, if appropriate, can flow back into the mold cavity in ways of "re-sucking".
  • a frame 17 On the lower bottom surface 15 of the feeder 10, a frame 17 is mounted, which holds a net-like fabric 18, which spans the trained in the lower bottom surface 15 feeder opening 16 of the feeder 10.
  • the frame 17 consists of two sub-frames, namely an upper, the feeder body 11 facing sub-frame 19 and a lower, the feeder body 11 facing away from sub-frame 20, wherein the two sub-frames 19, 20 receive the net-like fabric 18 between them. After applying the required tension of the net-like fabric 18, the two sub-frames 19, 20 fixed to each other, preferably welded together. This creates a stable and safe to handle in the manufacture of the feeder component.
  • FIGS. 2 to 4 shows, in its width of the material thickness of the feeder body 11 at its bottom surface 15 corresponding frame 17 distributed over its circumference a plurality of over the circumference of the feeder body 11 protruding tongues 22, wherein in the illustrated embodiment, the tongues 22 only on the upper sub-frame 19 are formed.
  • the tongues 22 are bent up until they reach into a clamping engagement with the outer circumference of the feeder body 11 and thereby define the frame 17 on the feeder body 11.
  • the net-like fabric 18 has at its center for reducing the flow resistance, a through hole 23 with a smaller dimension than the feeder opening 16 of the feeder 10. Furthermore, the points 21 arranged in the region of the tongues 22 can be seen, on which the two subframes 19, 20 are spot-welded in-between after insertion and tensioning of the net-like fabric 18.

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

Description

Die Erfindung betrifft einen Speiser in Form eines Kopfspeisers zum Einsetzen in eine beim Gießen von Metallen verwendete Gießform, bestehend aus einem einen inneren Hohlraum als Speiservolumen umschließenden, aus einem exothermen und/oder isolierenden Material bestehenden Speiserkorpus, welcher in seiner dem in der Gießform ausgebildeten Formhohlraum zugewandten Bodenfläche eine Speiseröffnung zum Verbinden des inneren Hohlraumes des Speiserkorpus mit dem Formhohlraum der Gießform während des Gießvorganges aufweist, wobei an dem Speiserkorpus ein dessen Speiseröffnung überspannendes netzartiges, aus einem feuerfesten Material bestehendes Gewebe angeordnet ist.The invention relates to a feeder in the form of a head feeder for insertion into a casting mold used in the casting of metals, consisting of an inner cavity as a feeder volume enclosing, consisting of an exothermic and / or insulating material feeder body, which in its mold cavity formed in the mold facing bottom surface has a feeder opening for connecting the inner cavity of the feeder body with the mold cavity of the mold during the casting process, wherein on the feeder body is arranged a feeder opening spanning net-like, consisting of a refractory material tissue.

In der Gießereitechnik ist es häufig notwendig, in den Gießformen zusätzliche Speiser anzuordnen, deren Speiserkorpus sich beim Abguss des Gussstückes mit dem flüssigen Metall füllt und bei der Erstarrung des Gussstücks auftretende Volumendefizite ausgleicht, um eine Lunkerbildung im Gussstück zu verhindern. Dazu müssen die Speiser so beschaffen sein, dass das darin eingespeiste flüssige Metall später als das Gussstück erstarrt, damit während des Erstarrungsvorganges ein Materialtransport zum Gussstück hin stattfinden kann, der das Gussstück dichtspeist. Hierzu bestehen die Speiser aus einem exothermen und/oder isolierenden Material oder werden als sogenannte Naturspeiser in dem das Gießmodell einschließenden Formsand ausgeformt. Im Rahmen von bekannten Verfahren zur Herstellung von mit Speisern zu versehenden Gießformen werden die Speiser mit einer beliebigen geometrischen Form an der zu speisenden Stelle des späteren Gussstücks an dem Gießmodell angeordnet und bei der Erstellung der Gießform durch Verdichtung des eingebrachten Formsandes fest eingeformt beziehungsweise ausgeformt. Bei einem anderen Verfahren werden beim Abformen des Gießmodells mittels des Formsandes Hohlräume geschaffen, in welche einzelne, aus einem exothermen und/oder isolierenden Material bestehende Speiser nachträglich eingesetzt werden und dadurch an den durch das Entformen des Gießmodells in der Gießform geschaffenen Formhohlraum angeschlossen sind. Dabei werden Speiser als sogenannte Kopfspeiser regelmäßig auf der Gießmodelloberfläche beziehungsweise auf dem späteren Gusstück angeordnet. Ein derartiger Speiser ist beispielsweise aus der DE 20 2013 104 863 U1 bekannt.In the foundry industry, it is often necessary to arrange additional feeders in the molds, whose feeder body fills with the casting of the casting with the liquid metal and compensates for volume deficits occurring during the solidification of the casting, in order to prevent voids formation in the casting. For this purpose, the feeders must be such that the liquid metal fed therein solidifies later than the casting, so that during the solidification process, a material transport can take place towards the casting, which tightly feeds the casting. For this purpose, the feeders consist of an exothermic and / or insulating material or are shaped as so-called natural feeders in the mold sand enclosing the casting model. In the context of known processes for the production of feeders to be provided Casting molds, the feeders are arranged with any geometric shape at the point to be fed the later casting on the casting model and molded or formed during the preparation of the mold by compaction of the introduced molding sand. In another method, when molding the casting model by means of the molding sand cavities are created in which individual, consisting of an exothermic and / or insulating material feeders are subsequently used and are thus connected to the mold cavity created by the demolding of the casting mold in the mold. In this case feeders are arranged as so-called head feeders regularly on the Gießmodelloberfläche or on the later Gusstück. Such a feeder is for example from the DE 20 2013 104 863 U1 known.

Beim Einsatz von Speisern besteht generell das Problem, dass nach dem Abguss in dem Speiserkorpus jeweils erstarrtes Gussmaterial in Form von sogenannten Speiserresten verbleibt, die nach dem Entformen des Gussstücks von diesem entfernt werden müssen. Um diese Abtrennung zu erleichtern, ist die Verwendung von sogenannten Brechkernen bekannt, die auf der dem Formhohlraum der Gießform zugewandten Unterseite des Speiserkorpus an dem Speiserkorpus festgelegt werden, aus einem feuerfesten Material bestehen und eine Durchtrittsöffnung aufweisen, über die das aus dem Formhohlraum der Gießform aufsteigende heiße Metall in den inneren Hohlraum des Speiserkorpus beziehungsweise von dort aus wieder zurück in den Formhohlraum strömt. Die in der Regel durch Schießen in einer Schießmaschine hergestellten Brechkerne sind scheibenförmig ausgebildet, wobei die Durchtrittsöffnung von einer im scheibenförmigen Brechkernkörper ausgebildeten Einschnürung gebildet ist, um dadurch eine Sollbruchstelle für das Abbrechen des Speiserrestes von der Oberfläche des Gusstückes zu schaffen. Eine derartige Anordnung des Speisers mit einem Brechkern ist beispielsweise aus der WO 2009/103539 A1 bekannt.When using feeders, there is generally the problem that after casting in the feeder body each solidified casting material remains in the form of so-called food remains, which must be removed after demolding of the casting of this. In order to facilitate this separation, the use of so-called refractive cores is known, which are fixed on the mold cavity of the mold facing bottom of the feeder body to the feeder body, made of a refractory material and having a passage opening over which rising from the mold cavity of the mold hot metal flows into the inner cavity of the feeder body or from there back into the mold cavity. The refractive cores usually produced by shooting in a shooting machine are disc-shaped, wherein the passage opening is formed by a constriction formed in the disc-shaped crusher core body, thereby to create a predetermined breaking point for breaking the riser from the surface of the casting. Such an arrangement of the feeder with a breaker core is for example from the WO 2009/103539 A1 known.

Aus der DE 94 19 461 U1 ist ein Kopfspeiser mit den eingangs genannten gattungsgemäßen Merkmalen bekannt, bei welchem ein die Speiseröffnung überspannendes, aus einem gasarmen feuerfesten Material bestehendes Gewebe auf den Speiserkorpus aufgenagelt oder aufgeklebt ist. Weiterhin ist aus der DE 84 18 690 U1 ein Brechkern für Speiser von Aluminiumgussstücken bekannt, der aus einem Gitternetz aus einander kreuzenden Glasfaserbündeln, Mineralfaserbündeln oder vorzugsweise schmelzeabweisend beschichteten Metalldrähten besteht, welches am Speiserkorpus angeklebt oder bei der Herstellung des Speisers an dem Speiserkorpus eingeformt ist.From the DE 94 19 461 U1 a head feeder with the aforementioned generic features is known in which a spanning the feeder opening, consisting of a gas-poor refractory material tissue is nailed or glued to the feeder body. Furthermore, from the DE 84 18 690 U1 a breaker core for feeders of cast aluminum pieces, which consists of a grid of intersecting glass fiber bundles, mineral fiber bundles or preferably melt-repellent coated metal wires, which is glued to the feeder body or formed in the manufacture of the feeder to the feeder body.

Der Erfindung liegt die Aufgabe zugrunde, einen Speiser mit den eingangs genannten gattungsgemäßen Merkmalen dahingehend zu verbessern, dass das Auftreten von nach dem Abguss an dem Gussstück verbleibenden und durch Putzarbeiten zu beseitigenden Metallresten weiter eingeschränkt ist.The invention has for its object to improve a feeder with the aforementioned generic features to the effect that the occurrence of remaining after casting on the casting and to be eliminated by cleaning metal residues is further limited.

Die Lösung dieser Aufgabe ergibt sich einschließlich vorteilhafter Ausgestaltungen und Weiterbildungen der Erfindung aus dem Inhalt der Patentansprüche, welche dieser Beschreibung nachgestellt sind.The solution to this problem arises, including advantageous refinements and developments of the invention from the content of the claims, which are adjusted to this description.

Die Erfindung sieht hierzu einen Speiser mit den eingangs genannten Merkmalen vor, bei welchem an dem Speiserkorpus ein aus einem hitzebeständigen Material bestehender ringförmiger Rahmen mit dem darin aufgespannten netzartigen Gewebe festgelegt ist, wobei der Rahmen an der Bodenfläche des Speiserkorpus derart angeordnet ist, dass das netzartige Gewebe bei in die Gießform eingeformten Speiser unmittelbar an der Oberfläche des durch das Abgießen gebildeten Gussstücks positioniert ist.The invention provides for this purpose a feeder with the features mentioned, in which on the feeder body an existing of a heat-resistant material annular frame is fixed with the net-like fabric spanned therein, wherein the frame is arranged on the bottom surface of the feeder body such that the net-like In the case of a feeder formed in the casting mold, tissue is positioned directly on the surface of the casting formed by the casting.

Mit der Erfindung ist der wesentliche Vorteil verbunden, dass aufgrund der Anordnung des Rahmens mit dem von ihm gehaltenen netzartigen Gewebe an der Bodenfläche des Speisers die Ebene des netzartigen Gewebes in der unteren, auf dem Gießmodell aufliegenden Bodenfläche des Speisers gelegen ist, sodass die von dem netzartigen Gewebe ausgebildete Sollbruchstelle für das Abbrechen des Speiserrestes unmittelbar an die Oberfläche des Gussstücks verlagert ist. Somit entsteht kaum ein zusätzlicher Putzaufwand. Ein weiterer Vorteil besteht darin, dass der Rahmen mit dem netzartigen Gewebe einfacher herzustellen ist als ein herkömmlicher Brechkern mit einem darin angeordneten Netz. Soweit eine ausreichende Spannung des netzartigen Gewebes im Fließweg zwischen Formhohlraum und Speiser sichergestellt sein muss, damit das Gewebe bei dem Durchströmen mit dem flüssigen Metall während des Abgusses nicht in den Formhohlraum und damit in die Gussstückstruktur hineingezogen wird, ermöglicht die Anordnung des Rahmens eine entsprechende Spannung und Halterung des netzartigen Gewebes in dem Rahmen. Der Einsatz eines aus einem hitzebeständigen Material bestehenden Rahmens zur Halterung des gespannten netzartigen Gewebes bietet zudem den Vorteil, dass der Rahmen nicht durch das den Brechkern durchströmende heiße Metall aufgeschmolzen wird und damit keine für den Gießprozess schädlichen Verbrennungsgase entstehen.The invention has the significant advantage that due to the arrangement of the frame with the net-like tissue held by him the bottom surface of the feeder is the level of the net-like fabric located in the lower, resting on the casting model bottom surface of the feeder, so that the predetermined breaking point formed by the net-like fabric for breaking the feeder remainder is directly displaced to the surface of the casting. Thus, hardly any additional cleaning effort. A further advantage is that the frame with the net-like fabric is easier to produce than a conventional break core with a net arranged therein. As far as sufficient tension of the net-like tissue in the flow path between mold cavity and feeder must be ensured so that the tissue is not drawn into the mold cavity and thus in the casting structure during the flow with the liquid metal during casting, the arrangement of the frame allows a corresponding Tension and retention of the net-like fabric in the frame. The use of a frame made of a heat-resistant material for holding the tensioned net-like fabric also has the advantage that the frame is not melted by the hot metal flowing through the breaker core and therefore no harmful for the casting process combustion gases.

Nach einem Ausführungsbeispiel der Erfindung ist vorgesehen, dass der Rahmen aus zwei gegeneinander gelegten und das netzartige Gewebe zwischen sich aufnehmenden Teilrahmen besteht, die nach Aufbringen der erforderlichen Spannung des netzartigen Gewebes gegeneinander festlegbar sind, wobei die Teilrahmen zu ihrer gegenseitigen Festlegung verschweißt, insbesondere an einzelnen Punkten punktverschweißt sein können.According to one embodiment of the invention, it is provided that the frame consists of two mutually juxtaposed and the net-like tissue between them receiving subframe, which can be fixed against each other after application of the required tension of the net-like fabric, the subframe welded to their mutual determination, in particular to individual Points can be spot-welded.

Erfindungsgemäß kann vorgesehen sein, dass die Breite des Rahmens der Materialstärke des Speiserkorpus an dessen Bodenfläche entspricht und der Rahmen auf die Bodenfläche des Speiserkorpus aufgelegt und an dem Speiserkorpus festgelegt ist, wobei diese Festlegung beispielsweise durch eine Klemmverbindung von Rahmen und Speiserkorpus oder durch Ankleben hergestellt sein kann.According to the invention, it may be provided that the width of the frame corresponds to the material thickness of the feeder body at its bottom surface and the frame is placed on the bottom surface of the feeder body and fixed to the feeder body, this determination being made for example by a clamping connection of frame and feeder body or by gluing can.

Hierzu kann im Einzelnen vorgesehen sein, dass der Rahmen zumindest bereichsweise nach außen über den Umfang des Speiserkorpus übersteht und der überstehende Bereich des Rahmens bei auf die Bodenfläche aufgelegtem Rahmen bis zur Anlage am Außenumfang des Speiserkorpus hochgebogen ist, sodass der hochgebogenen Bereich den Rahmen an dem Speiserkorpus festklemmt. Hierbei ist es nicht erforderlich, dass der Rahmen auf seinem gesamten Umfang mit dem Speiserkorpus verklemmt ist, vielmehr reicht es aus, wenn der Rahmen über seinen Umfang verteilt eine Mehrzahl von über den Speiserkorpus überstehenden und zur Festlegung des Rahmens an dem Speiserkorpus hochzubiegenden Zungen aufweist.For this purpose, it can be provided in detail that the frame protrudes at least in regions outwardly beyond the circumference of the feeder body and the projecting portion of the frame is bent up to the outer periphery of the feeder body when placed on the bottom surface frame, so that the bent portion of the frame on the Clamps feeder body. It is not necessary that the frame is jammed on its entire circumference with the feeder body, but it is sufficient if the frame distributed over its circumference a plurality of over the Having feeder body protruding and up to fix the frame to the feeder body tongues.

Alternativ kann vorgesehen sein, dass der Rahmen mit der Bodenfläche des Speiserkorpus verklebt ist.Alternatively it can be provided that the frame is glued to the bottom surface of the feeder body.

Hinsichtlich der Ausbildung des netzartigen Gewebes kann erfindungsgemäß vorgesehen sein, dass das netzartige Gewebe zur Verringerung des Durchströmungswiderstandes ein Durchgangsloch mit einer geringeren Abmessung als die Durchtrittsöffnung des Brechkerns aufweist. Im Einzelnen kann dabei nach einem Ausführungsbeispiel der Erfindung vorgesehen sein, dass das Durchgangsloch eine Fläche von 10 bis 50 Prozent der von dem Rahmen umschlossenen Fläche der Durchtrittsöffnung des Brechkerns aufweist, wobei die Netzweite, das heißt die Weite der Netzöffnungen, 1 bis 20 Millimeter bei einer Breite der die Netzstruktur bildenden Fäden von 1 bis 15 Millimetern beträgt.With regard to the formation of the net-like fabric can be inventively provided that the net-like fabric to reduce the flow resistance has a through hole with a smaller dimension than the passage opening of the refractive core. Specifically, it may be provided according to an embodiment of the invention that the through hole has an area of 10 to 50 percent of the area enclosed by the frame surface of the passage opening of the refractive core, wherein the network width, that is, the width of the network openings, 1 to 20 millimeters a width of the network structure forming threads of 1 to 15 millimeters.

Nach einem Ausführungsbeispiel der Erfindung kann der Rahmen aus Metall als dem hitzebeständigen Material bestehen. Da die dem Speiser abgewandte Unterseite des Rahmens von der Seite der Gießform bzw. von deren Formhohlraum her in Kontakt mit dem flüssigen Metall kommen kann, könnte sich wegen der Hitze des flüssigen Metalls das Gussteil mit dem Rahmen verbinden, was wiederum ein Abtrennen des Speiserrestes erschweren würde. Daher ist bei dem Einsatz von Metall als Material für die Herstellung des Rahmens vorgesehen, dass die dem Formhohlraum zugewandte Unterseite des Rahmens mit einer feuerfesten Beschichtung versehen ist. Hierzu kann beispielsweise eine feuerfeste Kokillenschlichte verwendet werden.According to an embodiment of the invention, the frame may be made of metal as the refractory material. Since the underside of the frame facing away from the feeder can come into contact with the liquid metal from the side of the casting mold or from its mold cavity, the casting could bond to the frame because of the heat of the liquid metal, which in turn makes separation of the feeder remainder difficult would. Therefore, with the use of metal as the material for the production of the frame is provided that the mold cavity-facing bottom of the frame is provided with a refractory coating. For this purpose, for example, a refractory Kokillenschlichte can be used.

Alternativ kann der Rahmen aus Keramik oder einem Feuerfestmaterial als jeweils hitzebeständigem Material bestehen.Alternatively, the frame may be made of ceramic or a refractory material as each heat-resistant material.

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

Fig. 1:
Einen Speiser mit einem an dessen Unterseite festgelegten, ein netzartiges Gewebe aufspannenden Rahmen in einem schematisierten Querschnitt,
Fig. 2:
den Rahmen gemäß Fig. 1 in einer Einzeldarstellung in dessen Zustand vor der Befestigung am Speiserkorpus,
Fig. 3:
den Rahmen gemäß Figur 2 in einer Draufsicht,
Fig. 4:
den Rahmen gemäß Fig. 2 in der an dem Speiserkorpus befestigtem Gestalt ohne Darstellung des zugehörigen Speiserkorpus,
Fig. 5:
den Rahmen gemäß Fig. 4 in einer Draufsicht.
In the drawing, an embodiment of the invention is reproduced, which is described below. Show it:
Fig. 1:
A feeder with a fixed on its underside, spanning a net-like fabric frame in a schematic cross section,
Fig. 2:
the frame according to Fig. 1 in a single representation in its state before attachment to the feeder body,
3:
the frame according to FIG. 2 in a plan view,
4:
the frame according to Fig. 2 in the attached to the feeder body shape without representation of the associated feeder body,
Fig. 5:
the frame according to Fig. 4 in a top view.

Der aus Fig. 1 ersichtliche Speiser 10 weist einen Speiserkorpus 11 auf, der einen einen inneren Hohlraum 12 als sogenanntes Speiservolumen umschließenden Wandbereich 13 und einen oberen Deckelbereich 14 umfasst. Dem Deckelbereich 14 liegt eine untere Bodenfläche 15 gegenüber in der eine Speiseröffnung 16 ausgebildet ist. Die Speiseröffnung 16 stellt bei in die Gießform eingeformten Speiser 10 die Verbindung zwischen dem inneren Hohlraum 12 des Speiserkorpus und dem in der Gießform ausgebildeten Formhohlraum her, sodass während des Gießvorganges das in den Formhohlraum eingebrachte flüssige Metall durch die Speiseröffnung 16 in den inneren Hohlraum 12 eintreten und gegebenenfalls in Wege eines "Nachsaugens" wieder in den Formhohlraum zurückfließen kann.The out Fig. 1 apparent feeder 10 has a feeder body 11 which comprises a wall portion 13 enclosing an inner cavity 12 as a so-called feeder volume and an upper lid portion 14. The lid region 14 is opposite to a lower bottom surface 15 in which a feeder opening 16 is formed. The feeder orifice 16, when the feeder 10 is molded into the mold, makes the connection between the inner cavity 12 of the feeder body and the mold cavity formed in the mold such that during the molding process, the liquid metal introduced into the mold cavity enters the inner cavity 12 through the feeder orifice 16 and, if appropriate, can flow back into the mold cavity in ways of "re-sucking".

An der unteren Bodenfläche 15 des Speisers 10 ist ein Rahmen 17 angebracht, der ein netzartiges Gewebe 18 hält, welches die in der unteren Bodenfläche 15 ausgebildete Speiseröffnung 16 des Speiser 10 überspannt.On the lower bottom surface 15 of the feeder 10, a frame 17 is mounted, which holds a net-like fabric 18, which spans the trained in the lower bottom surface 15 feeder opening 16 of the feeder 10.

Der Rahmen 17 besteht aus zwei Teilrahmen, nämlich einem oberen, dem Speiserkorpus 11 zugewandten Teilrahmen 19 und einem unteren, dem Speiserkorpus 11 abgewandten Teilrahmen 20, wobei die beiden Teilrahmen 19, 20 das netzartige Gewebe 18 zwischen sich aufnehmen. Nach Aufbringen der erforderlichen Spannung des netzartigen Gewebes 18 sind die beiden Teilrahmen 19, 20 aneinander fixiert, vorzugsweise miteinander verschweißt. Somit entsteht ein stabiles und bei der Herstellung des Speisers sicher handhabbares Bauteil.The frame 17 consists of two sub-frames, namely an upper, the feeder body 11 facing sub-frame 19 and a lower, the feeder body 11 facing away from sub-frame 20, wherein the two sub-frames 19, 20 receive the net-like fabric 18 between them. After applying the required tension of the net-like fabric 18, the two sub-frames 19, 20 fixed to each other, preferably welded together. This creates a stable and safe to handle in the manufacture of the feeder component.

Wie sich aus den Figuren 2 bis 4 ergibt, weist der in seiner Breite der Materialstärke des Speiserkorpus 11 an dessen Bodenfläche 15 entsprechende Rahmen 17 über seinen Umfang verteilt eine Mehrzahl von über den Umfang des Speiserkorpus 11 überstehenden Zungen 22 auf, wobei bei dem dargestellten Ausführungsbeispiel die Zungen 22 nur an dem oberen Teilrahmen 19 ausgebildet sind. Nach Auflegen des Rahmens 17 auf die untere Bodenfläche 15 des Speiserkorpus 11 werden die Zungen 22 hochgebogen, bis sie in eine klemmende Anlage an dem äußeren Umfang des Speiserkorpus 11 gelangen und dadurch den Rahmen 17 an dem Speiserkorpus 11 festlegen.As is clear from the FIGS. 2 to 4 shows, in its width of the material thickness of the feeder body 11 at its bottom surface 15 corresponding frame 17 distributed over its circumference a plurality of over the circumference of the feeder body 11 protruding tongues 22, wherein in the illustrated embodiment, the tongues 22 only on the upper sub-frame 19 are formed. After placing the frame 17 on the lower bottom surface 15 of the feeder body 11, the tongues 22 are bent up until they reach into a clamping engagement with the outer circumference of the feeder body 11 and thereby define the frame 17 on the feeder body 11.

Aus den Figuren 3 beziehungsweise 5 ist noch ersichtlich, dass das netzartige Gewebe 18 in seiner Mitte zur Verringerung des Durchströmungswiderstandes ein Durchgangsloch 23 mit einer geringeren Abmessung als die Speiseröffnung 16 des Speisers 10 aufweist. Ferner sind die im Bereich der Zungen 22 angeordneten Punkte 21 erkennbar, an denen die beiden Teilrahmen 19, 20 nach Einlegen und Spannen des netzartigen Gewebes 18 dazwischen punktverschweißt sind.From the Figures 3 5, it can be seen that the net-like fabric 18 has at its center for reducing the flow resistance, a through hole 23 with a smaller dimension than the feeder opening 16 of the feeder 10. Furthermore, the points 21 arranged in the region of the tongues 22 can be seen, on which the two subframes 19, 20 are spot-welded in-between after insertion and tensioning of the net-like fabric 18.

Die in der vorstehenden Beschreibung, den Patentansprüchen, der Zusammenfassung und der Zeichnung offenbarten Merkmale des Gegenstandes dieser Unterlagen können einzeln als auch in beliebigen Kombinationen untereinander für die Verwirklichung der Erfindung in ihren verschiedenen Ausführungsformen wesentlich sein.The features disclosed in the foregoing description, the claims, the abstract and the drawings of the subject matter of these documents may be essential individually as well as in any combination with each other for the realization of the invention in its various embodiments.

Claims (14)

  1. A feeder (10) in the form of a head feeder for use in a casting mold used for casting metals, comprising a feeder body (11) made from an exothermic and/or insulating material, the feeder body surrounding an inner cavity (1) as a feeder volume, the feeder body having a bottom surface (15) facing a mold cavity formed in the casting mold, the bottom surface (15) having a feeder opening (16) for connection of the inner cavity (12) of the feeder body (1) with the mold cavity of the casting mold during a casting process, wherein a netlike webbing is arranged on the feeder body, the netlike webbing spanning the feeder opening (16) of the feeder body (11) and being made of a fire-resistant material, characterized in that a ring-shaped frame (17) made of a heat-resistant material is secured to the feeder body (11), the netlike webbing (18) being spanned by the ring-shaped frame (17) in a tensioned manner, wherein the frame (17) is arranged on the surface (15) of the feeder body (11), such that the netlike webbing (18) is positioned with the feeder (10) formed in the casting mold directly on a surface of a casting piece to be formed during casting.
  2. The feeder (10) according to claim 1, wherein the frame (17) comprises two frame parts (19, 20) positioned against one another and receive the netlike webbing (18) therebetween, wherein the frame parts are securable to one another after application of a required tensioning force on the netlike webbing (18).
  3. The feeder (10) according to claim 2, wherein the frame parts (19, 20) are secured to one another via welding, in particular via spot welding.
  4. The feeder (10) according to one of claims 1 to 3, characterized in that a width of the frame (17) corresponds to a material thickness of the feeder body (11) on the bottom surface (15), and wherein the frame (17) is disposed on the bottom surface (15) of the feeder body (11) and attached to the feeder body (11).
  5. The feeder (10) according one of claims 1 to 4, characterized in that the frame (17) projects outwardly at least in one area over a periphery of the feeder body (11), wherein the at least one area the frame (17) that projects over said periphery of the feeder body (11) is bent up when the frame is positioned on the bottom surface (15) until contacting an outer periphery of the feeder body (11), so that the at least one area of the frame (17) that is bent up fixedly clamps onto the feeder body (11).
  6. The feeder (10) according to claim 5, characterized in that the frame (17) has a plurality of tongues (22) configured to be bent upwardly, wherein said tongues are positioned about a circumference of the frame (17), wherein said tongues (22) are configured for attachment of the frame (17) to the feeder body (11).
  7. The feeder (10) according to one of claims 1 to 4, characterized in that the frame (17) is glued with the bottom surface (15) of the feeder body (11).
  8. The feeder (10) according to one of claims 1 to 7, wherein the frame (17) is made from metal.
  9. The feeder (10) according to claim 8, wherein an underside of the frame (17) that faces toward the mold cavity of the casting mold is provided with a fire-resistant coating.
  10. The feeder (10) according to one of claims 1 to 7, wherein the frame is made of a ceramic material.
  11. The feeder (10) according to one of claims 1 to 7, wherein the frame (17) is made from a fire-resistant material.
  12. The feeder according to one of claims 1 to 11, wherein the netlike webbing (18) has a through-hole (23), wherein said through-hole (23) is smaller than the feeder opening (16) of the feeder (10).
  13. The feeder (10) according to claim 13, wherein the through-hole (23) has a surface of 10% to 50% of the surface of the netlike webbing (18) enclosed by the frame (17).
  14. The feeder (10) according to claim 12 or 13, wherein a width of the a net opening in the netlike webbing (18) is 1 mm to 20 mm, wherein the netlike webbing (18) is formed of fibers, each of said fibers having a width of 1 mm to 15 mm.
EP16183481.7A 2015-08-27 2016-08-10 Feeder comprising a netlike tissue spanning its feeder opening Active EP3138642B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202015104554.9U DE202015104554U1 (en) 2015-08-27 2015-08-27 Feeder with a mesh-like tissue spanning its mouth opening

Publications (2)

Publication Number Publication Date
EP3138642A1 EP3138642A1 (en) 2017-03-08
EP3138642B1 true EP3138642B1 (en) 2018-12-26

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US (1) US9981307B2 (en)
EP (1) EP3138642B1 (en)
DE (1) DE202015104554U1 (en)
TR (1) TR201901380T4 (en)

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Publication number Priority date Publication date Assignee Title
EP3919203A1 (en) 2020-06-03 2021-12-08 GTP Schäfer Gießtechnische Produkte GmbH Method and permanent mould for making a casting and net

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DE202015104553U1 (en) * 2015-08-27 2015-09-15 GTP Schäfer Gießtechnische Produkte GmbH Breaking core with a through the passage opening penetrating reticulated fabric
ES2769203T3 (en) 2016-03-18 2020-06-25 Gtp Schaefer Giesstechnische Produkte Gmbh Procedure for the manufacture of a feeder with a fabric as a network that covers the feeder opening thereof
CN107214302A (en) * 2017-05-18 2017-09-29 西峡县众德汽车部件有限公司 A kind of new casting pouring method
CN111299514A (en) * 2020-03-19 2020-06-19 山东春秋新材料股份有限公司 Low-gas-evolution combined heating riser
CN113547080B (en) * 2021-07-01 2023-04-25 宁波日月精华精密制造有限公司 Fiber riser easy-cutting net and preparation method and application thereof

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DE8418690U1 (en) * 1984-06-18 1985-10-03 Chemex GmbH, 5802 Wetter Breaker core for feeders of aluminum castings
DE9419461U1 (en) * 1994-12-05 1996-04-04 Metallgießerei Karl Scherb GmbH, 89165 Dietenheim Thermal riser sleeves or caps with vent hole and nailed (patted) or glued-on glass fiber crushing sieve for aluminum sand casting
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EP3919203A1 (en) 2020-06-03 2021-12-08 GTP Schäfer Gießtechnische Produkte GmbH Method and permanent mould for making a casting and net

Also Published As

Publication number Publication date
US20170056964A1 (en) 2017-03-02
DE202015104554U1 (en) 2015-09-15
US9981307B2 (en) 2018-05-29
EP3138642A1 (en) 2017-03-08
TR201901380T4 (en) 2019-02-21

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