EP3429777B1 - Method for producing a feeder with a mesh-like fabric covering over the feeder opening thereof - Google Patents

Method for producing a feeder with a mesh-like fabric covering over the feeder opening thereof Download PDF

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Publication number
EP3429777B1
EP3429777B1 EP17709972.8A EP17709972A EP3429777B1 EP 3429777 B1 EP3429777 B1 EP 3429777B1 EP 17709972 A EP17709972 A EP 17709972A EP 3429777 B1 EP3429777 B1 EP 3429777B1
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EP
European Patent Office
Prior art keywords
feeder
fabric
region
feeder body
positioning pins
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EP17709972.8A
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German (de)
French (fr)
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EP3429777A1 (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
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes
    • 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
    • B22C9/084—Breaker cores

Definitions

  • the invention relates to a method for producing a feeder intended for insertion into a casting mold used in the casting of metals with a feeder body enclosing an inner cavity as feeder volume and consisting of an exothermic and / or insulating material, which has at least one lateral wall area and one in the Mold region facing the mold cavity with a feed opening arranged therein for connecting the inner cavity of the feeder body to the mold cavity of the casting mold during the casting process and having a mesh-like fabric that spans its feed opening and consists of a refractory material, in the course of the manufacture of the feeder in one Core shooter a piece of tissue of the net-like fabric is positioned in a model device that forms the shape of the feeder in a core box of the core shooter such that an edge region of the body en area of the later feeder positioned piece of fabric is at least partially bent towards the side wall area of the feeder body and the raised edge area when shooting the feeder is surrounded by the injected material and anchored in the material of the finished feeder body.
  • FIG DE 20 2015 104 554 U1 The structure of a feeder to be produced using the method according to the invention is shown in FIG DE 20 2015 104 554 U1 described.
  • the feeder known therefrom has the shape of a so-called head feeder, there is a mesh-like fabric on the feeder that spans its feed opening arranged in the base region and consists of a refractory material arranged. This is to ensure that when the feeder is used in a casting mold, due to the hot metal being washed around the network structure during the casting process, a metal layer penetrated by the fabric forms after the casting has solidified. This creates a defined material weakening in the bottom area of the feeder, so that the metallic feeder residue that remains after the casting has solidified is knocked off exactly in the course of this fabric layer.
  • To fix the net-like fabric on the feeder body is according to the DE 20 2015 104 554 U1 provided that the net-like fabric is stretched and fixed in a separate frame, the frame being attached to the feeder body in a suitable manner, preferably being
  • the production of a feeder having a network structure arranged in its base area has the disadvantage of complex production, since in addition to the conventional shooting of the feeder body in a core shooter, the separate frame with the network-like fabric stretched therein is also produced and in an additional assembly step on the ready shot feeder body must be attached.
  • a method with the features mentioned at the outset for producing a feeder is out DE 24 46 554 A1 known.
  • Other manufacturing processes are out DE 10 2014 115 848 A1 and DE 20 2015 104 553 U1 known.
  • the invention is therefore based on the object of simplifying the method for producing a feeder having a mesh-like fabric spanning its feed opening. This object is achieved, including advantageous refinements and developments of the invention, from the content of the patent claims, which follow this description.
  • the basic idea of the invention provides that the piece of fabric is pressed between positioning pins which are arranged on a base plate of the model device which defines the base area of the feeder body and which protrudes into the lateral wall area of the later feeder body, so that the edge area of the piece of fabric projecting beyond the surface enclosed by the positioning pins is bent up
  • the invention has the advantage that the mesh-like fabric that spans the feed opening is shot in during the manufacture of the feeder body in one process step, so that a separate frame for fixing the mesh-like fabric is dispensed with.
  • all that is required is an addition to the model device which is to be provided anyway for the production of the feeder body in the core shooter.
  • At least three positioning pins are arranged distributed over the circumference of the base region of the feeder body. It is expedient to arrange four positioning pins at a circumferential distance of 90 degrees each.
  • the feeder body specified by the model device is formed with an opening opposite its bottom region, which is closed by means of a stopper inserted in the opening and forming a lid region of the feeder body.
  • the model device comprises the base plate with the positioning pins arranged thereon and a model part detachably placed thereon for shaping the inner cavity of the finished shot feeder body, the model part for positioning the piece of fabric from the base is removed.
  • the one from the 3 and 4 Details of the ready-made feeder body 11 of a feeder 10 include a side wall area 12 surrounding an inner cavity 25 as a so-called feeder volume, and a lower floor area 13 in which a feed opening 14 is formed.
  • the one shot in a core shooter, not shown Feeder body 11 initially has an upper opening 15 opposite its bottom area 13 with feed opening 14, which is closed when a feeder 10 is finished by means of a plug 16 inserted therein ( Fig. 4 ).
  • the feed opening 14 is covered or covered by a piece of fabric 21 made of a refractory material, the edge area 22 of which is bent up in the direction of the side wall area 12 is fixed in the exothermic and / or insulating material forming the bottom area 13 of the feeder 10.
  • the shape of the feeder body 10 is characterized by one in one Fig. 1 apparent core box 30 of the core shooting machine with a lower box 31 and an upper box 32 located model device 17.
  • the model device 17 comprises a base plate 18 on which a cylindrical model part 20 rises and projects into a cavity 33 enclosed by the lower box 31 and upper box 32, so that when the material is shot into the core box 30, the inner cavity 25 of the feeder body 11 passes through the model part 20 and the feeder body 11 itself is formed by the free area of the cavity 33.
  • the cross-sectional area at the lower end of the model part 20 also forms the feed opening 14 formed in the bottom region 13 of the feeder body 11.
  • four positioning pins 19 are arranged at regular intervals over the circumference of the model device 17 on the base plate 18. How to do this Fig. 2 results, after the model part 20 has been removed from the base plate 18, a piece of fabric 21 is pressed between the positioning pins 19. Since the area of the piece of fabric 21 is set larger than the area enclosed by the positioning pins 19, the outer edge region of the piece of fabric 21 is bent upward by pressing the piece of fabric 21 between the positioning pins 19, so that it also results from the 3 and 4 resulting curved edge region 22 of the fabric piece 21 is formed.
  • the model part 20 is placed again on the base plate 18 of the model device 17, so that the exothermic and / or insulating material used to produce the feeder 10 can be shot into the core box.
  • the material envelops the standing model part 20 and forms the side wall region 12 of the finished feeder body 11.
  • the model part 20 is first opened through the upper opening 15 of the feeder body ( Figure 3 ) removed, because the feed opening 14 formed in the base area 13 could not slide over a remaining model part 20 due to the fabric piece 21 molded therein for demolding the feeder 10. In this respect, the removal of the model part 20 is necessary.
  • the feeder body 11 can be removed from the core box with the piece of fabric 21 molded into its base region 13. In this case, the positioning pins 19 leave open channels 23 in the base area 13 extending into the side wall area 12.
  • the piece of fabric 21 formed from the net-like fabric has a through hole 26 in its center to reduce the flow resistance with a smaller dimension than the feed opening 14 of the feeder 10.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines zum Einsetzen in eine beim Gießen von Metallen verwendete Gießform vorgesehenen Speisers mit einem einen inneren Hohlraum als Speiservolumen umschließenden, aus einem exothermen und/oder isolierenden Material bestehenden Speiserkorpus, welcher mindestens einen seitlichen Wandbereich sowie einen dem in der Gießform ausgebildeten Formhohlraum zugewandten Bodenbereich mit einer darin angeordneten Speiseröffnung zum Verbinden des inneren Hohlraumes des Speiserkorpus mit dem Formhohlraum der Gießform während des Gießvorganges aufweist und ein seine Speiseröffnung überspannendes, aus einem feuerfesten Material bestehendes netzartiges Gewebe aufweist, wobei im Rahmen der Herstellung des Speisers in einer Kernschießmaschine ein Gewebestück des netzartigen Gewebes in einer die Form des Speisers in einem Kernkasten der Kernschießmaschine ausbildenden Modelleinrichtung derart positioniert wird, dass ein Randbereich des im Bodenbereich des späteren Speisers positionierten Gewebestücks zumindest teilweise in Richtung des seitlichen Wandbereichs des Speiserkorpus hochgebogen wird und der hochgebogene Randbereich beim Schießen des Speisers von dem eingeschossenen Material umgeben und in dem Material des fertig geschossenen Speiserkorpus verankert wird.The invention relates to a method for producing a feeder intended for insertion into a casting mold used in the casting of metals with a feeder body enclosing an inner cavity as feeder volume and consisting of an exothermic and / or insulating material, which has at least one lateral wall area and one in the Mold region facing the mold cavity with a feed opening arranged therein for connecting the inner cavity of the feeder body to the mold cavity of the casting mold during the casting process and having a mesh-like fabric that spans its feed opening and consists of a refractory material, in the course of the manufacture of the feeder in one Core shooter a piece of tissue of the net-like fabric is positioned in a model device that forms the shape of the feeder in a core box of the core shooter such that an edge region of the body en area of the later feeder positioned piece of fabric is at least partially bent towards the side wall area of the feeder body and the raised edge area when shooting the feeder is surrounded by the injected material and anchored in the material of the finished feeder body.

Ein mit dem erfindungsgemäßen Verfahren herzustellender Speiser ist in seinem Aufbau in der DE 20 2015 104 554 U1 beschrieben. Soweit der daraus bekannte Speiser die Form eines sogenannten Kopfspeisers aufweist, ist an dem Speiser ein seine im Bodenbereich angeordnete Speiseröffnung überspannendes, aus einem feuerfesten Material bestehendes netzartiges Gewebe angeordnet. Damit soll erreicht werden, dass sich beim Einsatz des Speisers in einer Gießform aufgrund des während des Gießvorganges eintretenden Umspülens der Netzstruktur durch das heiße Metall nach dem Erstarren des Gussstücks eine von dem Gewebe durchsetzte Metallschicht ausbildet. Diese schafft im Bodenbereich des Speisers eine definierte Materialschwächung, so dass ein Abschlagen des nach dem Erstarren des Gussstücks verbleibenden, metallischen Speiserrests genau im Verlaufe dieser Gewebeschicht geschieht. Zur Festlegung des netzartigen Gewebes an dem Speiserkorpus ist gemäß der DE 20 2015 104 554 U1 vorgesehen, dass das netzartige Gewebe in einem gesonderten Rahmen aufgespannt und festgelegt ist, wobei der Rahmen an dem Speiserkorpus in geeigneter Weise befestigt, vorzugsweise festgeklemmt ist.The structure of a feeder to be produced using the method according to the invention is shown in FIG DE 20 2015 104 554 U1 described. Insofar as the feeder known therefrom has the shape of a so-called head feeder, there is a mesh-like fabric on the feeder that spans its feed opening arranged in the base region and consists of a refractory material arranged. This is to ensure that when the feeder is used in a casting mold, due to the hot metal being washed around the network structure during the casting process, a metal layer penetrated by the fabric forms after the casting has solidified. This creates a defined material weakening in the bottom area of the feeder, so that the metallic feeder residue that remains after the casting has solidified is knocked off exactly in the course of this fabric layer. To fix the net-like fabric on the feeder body is according to the DE 20 2015 104 554 U1 provided that the net-like fabric is stretched and fixed in a separate frame, the frame being attached to the feeder body in a suitable manner, preferably being clamped.

Insofern ist mit der Herstellung eines eine in seinem Bodenbereich angeordnete Netzstruktur aufweisenden Speisers der Nachteil einer aufwendigen Herstellung verbunden, da zusätzlich zu dem herkömmlichen Schießen des Speiserkorpus in einer Kernschießmaschine auch der gesonderte Rahmen mit dem darin aufgespannten netzartigen Gewebe hergestellt und in einem zusätzlichen Montageschritt an dem fertig geschossenen Speiserkorpus befestigt werden muss.In this respect, the production of a feeder having a network structure arranged in its base area has the disadvantage of complex production, since in addition to the conventional shooting of the feeder body in a core shooter, the separate frame with the network-like fabric stretched therein is also produced and in an additional assembly step on the ready shot feeder body must be attached.

Ein Verfahren mit den eingangs genannten Merkmalen zur Herstellung eines Speisers ist aus DE 24 46 554 A1 bekannt. Weitere Herstellungsverfahren sind aus DE 10 2014 115 848 A1 und DE 20 2015 104 553 U1 bekannt.A method with the features mentioned at the outset for producing a feeder is out DE 24 46 554 A1 known. Other manufacturing processes are out DE 10 2014 115 848 A1 and DE 20 2015 104 553 U1 known.

Der Erfindung liegt daher die Aufgabe zugrunde, das Verfahren zur Herstellung eines eine seine Speiseröffnung überspannendes netzartiges Gewebe aufweisenden Speisers zu vereinfachen. Die Lösung dieser Aufgabe ergibt sich einschließlich vorteilhafter Ausgestaltungen und Weiterbildungen der Erfindung aus dem Inhalt der Patentansprüche, welche dieser Beschreibung nachgestellt sind.The invention is therefore based on the object of simplifying the method for producing a feeder having a mesh-like fabric spanning its feed opening. This object is achieved, including advantageous refinements and developments of the invention, from the content of the patent claims, which follow this description.

Die Erfindung sieht in ihrem Grundgedanken vor, dass das Gewebestück zwischen an einer den Bodenbereich des Speiserkorpus vorgebenden Grundplatte der Modelleinrichtung angeordnete, in den seitlichen Wandbereich des späteren Speiserkorpus hochstehende Positionierstifte gedrückt wird, sodass der über die von den Positionierstiften umschlossene Fläche überstehende Randbereich des Gewebestücks hochgebogen wird.. Insofern ist mit der Erfindung der Vorteil verbunden, dass das die Speiseröffnung überspannende netzartige Gewebe bei der Herstellung des Speiserkorpus in einem Verfahrensschritt mit eingeschossen wird, so dass auf einen gesonderten Rahmen zur Festlegung des netzartigen Gewebes verzichtet ist. Soweit damit die Positionierung des Gewebestücks an dem Bodenbereich des späteren Speiserkorpus erleichtert ist, ist lediglich eine Ergänzung der für die Herstellung des Speiserkorpus in der Kernschießmaschine ohnehin vorzuhaltenden Modelleinrichtung erforderlich.The basic idea of the invention provides that the piece of fabric is pressed between positioning pins which are arranged on a base plate of the model device which defines the base area of the feeder body and which protrudes into the lateral wall area of the later feeder body, so that the edge area of the piece of fabric projecting beyond the surface enclosed by the positioning pins is bent up In this respect, the invention has the advantage that the mesh-like fabric that spans the feed opening is shot in during the manufacture of the feeder body in one process step, so that a separate frame for fixing the mesh-like fabric is dispensed with. To the extent that the positioning of the piece of fabric on the base area of the later feeder body is facilitated, all that is required is an addition to the model device which is to be provided anyway for the production of the feeder body in the core shooter.

Hierbei kann vorgesehen sein, dass über den Umfang des Bodenbereichs des Speiserkorpus verteilt wenigstens drei Positionierstifte angeordnet sind. Zweckmäßig ist dabei die Anordnung von vier Positionierstiften in einem Umfangsabstand von jeweils 90 Grad.It can be provided here that at least three positioning pins are arranged distributed over the circumference of the base region of the feeder body. It is expedient to arrange four positioning pins at a circumferential distance of 90 degrees each.

Hinsichtlich der Ausbildung des Speisers kann vorgesehen sein, dass der von der Modelleinrichtung vorgegebene Speiserkorpus mit einer seinem Bodenbereich gegenüberliegenden Öffnung ausgebildet wird, die mittels eines in die Öffnung eingesetzten, einen Deckelbereich des Speiserkorpus ausbildenden Stopfens verschlossen wird.With regard to the design of the feeder, it can be provided that the feeder body specified by the model device is formed with an opening opposite its bottom region, which is closed by means of a stopper inserted in the opening and forming a lid region of the feeder body.

Hinsichtlich eines zur Herstellung des Speisers geeigneten Verfahrens kann weiterhin vorgesehen sein, dass die Modelleinrichtung die Grundplatte mit den daran angeordneten Positionierstiften und einen darauf lösbar aufgesetzten Modellteil zur Ausformung des inneren Hohlraums des fertig geschossenen Speiserkorpus umfasst, wobei der Modellteil zum Positionieren des Gewebestücks von dem Sockel abgenommen wird.With regard to a method suitable for producing the feeder, it can further be provided that the model device comprises the base plate with the positioning pins arranged thereon and a model part detachably placed thereon for shaping the inner cavity of the finished shot feeder body, the model part for positioning the piece of fabric from the base is removed.

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

Fig. 1:
einen Kernkasten einer für die Herstellung eines Speisers eingerichteten Kernschießmaschine mit einer darin befindlichen Modelleinrichtung,
Fig. 2:
in einer Einzeldarstellung die Grundplatte der Modelleinrichtung gemäß Fig. 1 einschließlich der daran angeordneten Positionierstifte mit einem dazwischen eingedrückten Gewebestück bei weggenommenem, das Speiservolumen ausbildenden Modellteil, in einer Draufsicht,
Fig. 3:
den fertig geschossenen Speiserkorpus mit dem in seinem Bodenbereich verankerten Gewebestück im Schnitt,
Fig. 4:
den Speiserkorpus gemäß Fig. 3 nach Einsetzen eines einen Deckelbereich ausbildenden Stopfens.
In the drawing, an embodiment of the invention is shown, which is described below. Show it:
Fig. 1:
a core box of a core shooter set up for the production of a feeder with a model device located therein,
Fig. 2:
in a single representation the base plate of the model device according to Fig. 1 including the positioning pins arranged thereon with a piece of fabric pressed in between, with the model part which forms the feeder volume removed, in a plan view,
Fig. 3:
the finished shot of the feeder body with the piece of fabric anchored in its bottom area,
Fig. 4:
according to the feeder body Fig. 3 after inserting a stopper forming a lid area.

Der aus den Fig. 3 und 4 im Einzelnen ersichtliche, fertig geschossene Speiserkorpus 11 eines Speisers 10 umfasst einen einen inneren Hohlraum 25 als sogenanntes Speiservolumen umschließenden seitlichen Wandbereich 12 sowie einen unteren Bodenbereich 13, in welchem eine Speiseröffnung 14 ausgebildet ist. Der in einer nicht dargestellten Kernschießmaschine fertig geschossene Speiserkorpus 11 weist zunächst eine seinem Bodenbereich 13 mit Speiseröffnung 14 gegenüberliegende obere Öffnung 15 auf, die im Rahmen einer Fertigstellung des Speisers 10 mittels eines darin eingesteckten Stopfens 16 verschlossen ist (Fig. 4). Die Speiseröffnung 14 wird von einem aus einem feuerfesten Material bestehenden Gewebestück 21 überspannt bzw. abgedeckt, dessen in Richtung des seitlichen Wandbereichs 12 hochgebogener Randbereich 22 in dem den Bodenbereich 13 des Speisers 10 ausbildenden exothermen und/oder isolierenden Material festgelegt ist.The one from the 3 and 4 Details of the ready-made feeder body 11 of a feeder 10 include a side wall area 12 surrounding an inner cavity 25 as a so-called feeder volume, and a lower floor area 13 in which a feed opening 14 is formed. The one shot in a core shooter, not shown Feeder body 11 initially has an upper opening 15 opposite its bottom area 13 with feed opening 14, which is closed when a feeder 10 is finished by means of a plug 16 inserted therein ( Fig. 4 ). The feed opening 14 is covered or covered by a piece of fabric 21 made of a refractory material, the edge area 22 of which is bent up in the direction of the side wall area 12 is fixed in the exothermic and / or insulating material forming the bottom area 13 of the feeder 10.

Soweit die Herstellung eines in seinem Aufbau vorstehend beschriebenen Speisers 10 in einer bekannten Weise durch Schießen in einer Kernschießmaschine erfolgt, wird die Gestalt des Speiserkorpus 10 durch eine in einem aus Fig. 1 ersichtlichen Kernkasten 30 der Kernschießmaschine mit einem Unterkasten 31 und einem Oberkasten 32 befindliche Modelleinrichtung 17 ausgebildet. Die Modelleinrichtung 17 umfasst eine Grundplatte 18, auf welcher sich ein zylinderförmiger Modellteil 20 erhebt und in einen von Unterkasten 31 und Oberkasten 32 umschlossenen Hohlraum 33 ragt, so dass beim Einschießen des Materials in den Kernkasten 30 der innere Hohlraum 25 des Speiserkorpus 11 durch den Modellteil 20 und der Speiserkorpus 11 selbst durch den freien Bereich des Hohlraums 33 ausgebildet wird.Insofar as the manufacture of a feeder 10 described above in its construction takes place in a known manner by shooting in a core shooting machine, the shape of the feeder body 10 is characterized by one in one Fig. 1 apparent core box 30 of the core shooting machine with a lower box 31 and an upper box 32 located model device 17. The model device 17 comprises a base plate 18 on which a cylindrical model part 20 rises and projects into a cavity 33 enclosed by the lower box 31 and upper box 32, so that when the material is shot into the core box 30, the inner cavity 25 of the feeder body 11 passes through the model part 20 and the feeder body 11 itself is formed by the free area of the cavity 33.

Gleichzeitig bildet die Querschnittsfläche am unteren Ende des Modellteils 20 auch die im Bodenbereich 13 des Speiserkorpus 11 ausgebildete Speiseröffnung 14 aus. Zur Fixierung des Gewebestücks 21 beim Schießvorgang des Speisers 10 sind über den Umfang der Modelleinrichtung 17 an der Grundplatte 18 in regelmäßigem Abstand verteilt vier Positionierstifte 19 angeordnet. Wie sich dazu aus Fig. 2 ergibt, wird nach zwischenzeitlichem Abnehmen des Modellteils 20 von der Grundplatte 18 ein Gewebestück 21 zwischen die Positionierstifte 19 gedrückt. Da die Fläche des Gewebestücks 21 größer festgelegt ist als der von den Positionierstiften 19 umschlossene Flächenbereich, wird durch das Eindrücken des Gewebestücks 21 zwischen die Positionierstifte 19 der äußere Randbereich des Gewebestücks 21 hochgebogen, so dass der sich auch aus den Fig. 3 und 4 ergebende hochgebogene Randbereich 22 des Gewebestücks 21 entsteht. Nach Eindrücken des Gewebestücks 21 wird der Modellteil 20 wieder auf die Grundplatte 18 der Modelleinrichtung 17 aufgesetzt, so dass das der Herstellung des Speisers 10 dienende exotherme und/oder isolierende Material in den Kernkasten eingeschossen werden kann. Dabei umhüllt das Material den stehenden Modellteil 20 und bildet dabei den seitlichen Wandbereich 12 des fertig geschossenen Speiserkorpus 11 aus. Zum Entformen des Speiserkorpus wird zunächst der Modellteil 20 über die zunächst offen gelassene obere Öffnung 15 des Speiserkorpus (Figur 3) entfernt, da die im Bodenbereich 13 ausgebildete Speiseröffnung 14 aufgrund des darin eingeformten Gewebestücks 21 zum Entformen des Speisers 10 eben nicht über einen verbleibenden Modellteil 20 gleiten könnte. Insofern ist die Entnahme des Modellteils 20 erforderlich. Danach kann der Speiserkorpus 11 mit in dessen Bodenbereich 13 eingeformten Gewebestück 21 aus dem Kernkasten entnommen werden. Dabei hinterlassen die Positionierstifte 19 im Bodenbereich 13 bis in den seitlichen Wandbereich 12 hineinreichende offene Kanäle 23.At the same time, the cross-sectional area at the lower end of the model part 20 also forms the feed opening 14 formed in the bottom region 13 of the feeder body 11. To fix the piece of fabric 21 during the shooting process of the feeder 10, four positioning pins 19 are arranged at regular intervals over the circumference of the model device 17 on the base plate 18. How to do this Fig. 2 results, after the model part 20 has been removed from the base plate 18, a piece of fabric 21 is pressed between the positioning pins 19. Since the area of the piece of fabric 21 is set larger than the area enclosed by the positioning pins 19, the outer edge region of the piece of fabric 21 is bent upward by pressing the piece of fabric 21 between the positioning pins 19, so that it also results from the 3 and 4 resulting curved edge region 22 of the fabric piece 21 is formed. After the fabric piece 21 has been pressed in, the model part 20 is placed again on the base plate 18 of the model device 17, so that the exothermic and / or insulating material used to produce the feeder 10 can be shot into the core box. The material envelops the standing model part 20 and forms the side wall region 12 of the finished feeder body 11. To demold the feeder body, the model part 20 is first opened through the upper opening 15 of the feeder body ( Figure 3 ) removed, because the feed opening 14 formed in the base area 13 could not slide over a remaining model part 20 due to the fabric piece 21 molded therein for demolding the feeder 10. In this respect, the removal of the model part 20 is necessary. Thereafter, the feeder body 11 can be removed from the core box with the piece of fabric 21 molded into its base region 13. In this case, the positioning pins 19 leave open channels 23 in the base area 13 extending into the side wall area 12.

Aus Fig. 2 sind zudem in der Grundplatte 18 ausgebildete Entlüftungsdüsen 34 ersichtlich.Out Fig. 2 ventilation nozzles 34 formed in the base plate 18 can also be seen.

Wie bereits in der DE 20 2015 104 554 U1 beschrieben, weist das aus dem netzartigen Gewebe gebildete Gewebestück 21 in seiner Mitte zur Verringerung des Strömungswiderstandes ein Durchgangsloch 26 mit einer geringeren Abmessung als die Speiseröffnung 14 des Speisers 10 auf.As already in the DE 20 2015 104 554 U1 described, the piece of fabric 21 formed from the net-like fabric has a through hole 26 in its center to reduce the flow resistance with a smaller dimension than the feed opening 14 of the feeder 10.

Claims (5)

  1. Method for producing a feeder (10) that is intended for use in a casting mold used for the casting of metals and that comprises a feeder body (11), which encloses an inner cavity (25) as a feeder volume, consists of an exothermic and/or insulating material, has at least one lateral wall region (12) and a bottom region (13) with a feeder opening (14) arranged therein for connecting the inner cavity (25) of the feeder body (11) to the mold cavity of the casting mold during the casting operation and has a mesh-like fabric consisting of a refractory material covering over the feeder opening (14) therein, wherein in the course of the production of the feeder in a core shooter, a fabric piece (21) of the mesh-like fabric is positioned in a pattern device (17) forming the shape of the feeder (10) in a core box (30) of the core shooter, in such a way that the peripheral region (22) of the fabric piece (21) positioned in the bottom region (13) of the later feeder (10) is at least partially bent up in the direction of the lateral wall region (13) of the feeder body (11) and, during the shooting of the feeder (10), the bent-up peripheral region (22) is surrounded by the material shot in and is anchored in the material of the finished shot feeder (10), characterized in that the fabric piece (21) is pressed between positioning pins which are arranged on a base plate of the model device predetermining the bottom region of the feeder body, and which positioning pins project into the lateral wall region of the subsequently produced feeder body, so that the peripheral region (22) of the fabric piece (21) projecting over the area surrounded by the positioning pins (19) is bent up.
  2. Method according to claim 1, in which at least three positioning pins (19) are spaced about the periphery of the bottom region (13) of the feeder body (11).
  3. Method according to claim 1, in which at least four positioning pins (19) are spaced about the periphery of the bottom region (13).
  4. Method according to one of claims 1 through 3, in which the feeder body (11), which is predetermined in its shape by the pattern device (17), is formed with an upper opening (15) positioned opposite to its bottom region (13), the upper opening being closed by means of a plug inserted into the opening (15) and forming a cover region of the feeder body (10).
  5. Method according to one of claims 1 through 4, in which the pattern device (17) encompasses the base plate (18) with the positioning pins (19) arranged thereon and a pattern part (20) releasably positioned thereon for forming of the inner cavity (25) of the shot feeder body (11), wherein the pattern part (20) is removed from the base plate (18) for positioning of the fabric piece (21).
EP17709972.8A 2016-03-18 2017-03-10 Method for producing a feeder with a mesh-like fabric covering over the feeder opening thereof Active EP3429777B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016105106 2016-03-18
PCT/EP2017/055663 WO2017157788A1 (en) 2016-03-18 2017-03-10 Method for producing a feeder with a mesh-like fabric covering over the feeder opening thereof

Publications (2)

Publication Number Publication Date
EP3429777A1 EP3429777A1 (en) 2019-01-23
EP3429777B1 true EP3429777B1 (en) 2019-12-18

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Application Number Title Priority Date Filing Date
EP17709972.8A Active EP3429777B1 (en) 2016-03-18 2017-03-10 Method for producing a feeder with a mesh-like fabric covering over the feeder opening thereof

Country Status (4)

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US (1) US10525526B2 (en)
EP (1) EP3429777B1 (en)
ES (1) ES2769203T3 (en)
WO (1) WO2017157788A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017157788A1 (en) 2016-03-18 2017-09-21 Gtp Schäfer Giesstechnische Produkte Gmbh Method for producing a feeder with a mesh-like fabric covering over the feeder opening thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7411720L (en) * 1973-09-28 1975-04-01 Namco Aikoh Ltd
FR2588768B1 (en) 1985-10-19 1989-12-22 Kubota Ltd HIGH MELTING MOLTEN METAL FILTER AND PROCESS FOR PRODUCING THE SAME
US9573188B2 (en) * 2012-11-29 2017-02-21 Gtp Schäfer Giesstechnische Produkte Gmbh Method for producing a feeder having an exothermic feeder body, and a feeder having an insulating external shell
DE202013104863U1 (en) * 2013-10-30 2013-11-15 GTP Schäfer Gießtechnische Produkte GmbH Feeder insert with a stopper arranged in its lid area
DE202015104554U1 (en) 2015-08-27 2015-09-15 GTP Schäfer Gießtechnische Produkte GmbH Feeder with a mesh-like tissue spanning its mouth opening
DE202015104553U1 (en) * 2015-08-27 2015-09-15 GTP Schäfer Gießtechnische Produkte GmbH Breaking core with a through the passage opening penetrating reticulated fabric
WO2017157788A1 (en) 2016-03-18 2017-09-21 Gtp Schäfer Giesstechnische Produkte Gmbh Method for producing a feeder with a mesh-like fabric covering over the feeder opening thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2017157788A1 (en) 2017-09-21
US20190105706A1 (en) 2019-04-11
EP3429777A1 (en) 2019-01-23
US10525526B2 (en) 2020-01-07
ES2769203T3 (en) 2020-06-25
ES2769203T8 (en) 2020-08-06

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