EP3756787A1 - Feeder insert with sleeve - Google Patents

Feeder insert with sleeve Download PDF

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Publication number
EP3756787A1
EP3756787A1 EP19182035.6A EP19182035A EP3756787A1 EP 3756787 A1 EP3756787 A1 EP 3756787A1 EP 19182035 A EP19182035 A EP 19182035A EP 3756787 A1 EP3756787 A1 EP 3756787A1
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EP
European Patent Office
Prior art keywords
feeder
outer contour
casing
opening
cavity
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19182035.6A
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German (de)
French (fr)
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EP3756787B1 (en
Inventor
Thomas Baginski
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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Priority to EP19182035.6A priority Critical patent/EP3756787B1/en
Publication of EP3756787A1 publication Critical patent/EP3756787A1/en
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Publication of EP3756787B1 publication Critical patent/EP3756787B1/en
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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
    • B22C9/084—Breaker cores

Definitions

  • the present invention relates to a feeder insert for insertion into a casting mold used in the casting of metals, comprising a feeder body consisting of an insulating and / or exothermic feeder material, the feeder body having a circumferential and outwardly directed outer contour, one at least limited by the side wall Feeder cavity for receiving liquid metal and a feeder opening for connecting the feeder cavity to a mold cavity of the casting mold during the casting process.
  • the feeder opening is generally formed in a bottom area of the feeder body, the feeder cavity being delimited by a cover area on the side opposite the bottom area, with a further opening being able to be formed in the cover area.
  • the feeder inserts In foundry technology, it is often necessary to arrange additional feeder inserts in the casting molds, the feeder body of which fills with the liquid metal when the casting is poured and compensates for any volume deficits that occur during the solidification of the casting, in order to prevent voids in the casting.
  • the feeder inserts must be designed in such a way that the liquid metal fed into them solidifies later than the casting so that material can be transported to the casting during the solidification process, which tightly feeds the casting.
  • the so-called Module of the feeder insert must be larger than the module of the respective node point of the casting to be cast.
  • the feeder inserts have the feeder cavity delimited by the feeder body for receiving liquid metal and a feeder opening for connecting the feeder cavity to the mold cavity of the casting mold during the casting process.
  • the feeder cavity consists of an exothermic and / or insulating feeder material.
  • the exothermic material should comprise an oxidizable metal and an oxidizing agent, which can produce an exothermic reaction, it has also already been proposed to add constituents of an insulating refractory material to the material mixture, so that an exothermic-insulating material mixture results.
  • the heat balance of pure insulating feeders is worse due to the lack of an active heat supply during the solidification process.
  • feeder bodies made of exothermic / insulating granular feeder material In contrast to feeder bodies made of exothermic / insulating granular feeder material, feeder bodies made of a pure metal body are also known. Such a dimensionally stable, metallic feeder is for example in EP 1 864 729 A2 described. Since there is no exothermic reaction with these feeder inserts, only the insulating effect is taken into account. Since the dimensionally stable metal body must not melt, it requires a corresponding wall that removes heat from the liquid metal when it is touched, which can lead to the formation of edge shells on the metal feeder residue. In addition, gases generated during the casting process cannot be discharged and so-called gas defects or gas explosions can occur inside the feeder.
  • EP 2 489 449 B1 known to enclose a feeder body made of exothermic feeder material with a shell made of insulating refractory material.
  • the manufacture of such a shell made of refractory material is relatively expensive.
  • a feeder insert is known with an exothermic feeder body, in which the side wall of the feeder body extends convexly outwards starting from the upper wall part and merges at the lower end into a passage part also known as the feeder neck, the side wall having several ribs protruding into the interior, which at the ends merge into the upper wall or the passage part.
  • the feeder body can either be assembled from several separately manufactured parts or manufactured in one piece using a lost core. However, the use of a lost core in production is expensive.
  • the object of the present invention is to provide a feeder insert that can be used in an alternative way provides a higher module with the same feeder mass and the same feeder cavity volume.
  • the object is achieved in particular by a feeder insert with the features mentioned at the beginning, the feeder insert comprising a casing in addition to the feeder body, the casing at least partially surrounding the outer contour and at least one cavity being formed between the casing and the outer contour.
  • the basic idea of the invention therefore provides that the feeder body made of a granular and / or fiber-like feeder material is surrounded by a casing at least along a longitudinal section in the circumferential direction, with air between at least one section of the inside of the casing and a section of the outer contour filled cavity is formed.
  • the feeder insert thus has insulation formed by the at least one cavity, which during the casting process reduces the amount of heat that is given off from the feeder body to the molding material surrounding the feeder insert.
  • With a corresponding dimensioning of the feeder insert it has either a higher module with the same weight or the same volume of the feeder body or the same module with a lower weight or smaller volume of the feeder body compared to conventional feeder inserts (without casing).
  • the cavity is also delimited by the casing in the axial longitudinal direction of the feeder body.
  • the at least one cavity can be closed by the feeder body itself at, for example, its upper end facing the cover area. It is preferred that the at least one cavity is delimited by the shell on one side in the axial longitudinal direction, in particular in the direction of the bottom area.
  • the casing can in particular be designed in the shape of a pot, the casing having at least one base section which may have an opening and which rests against an end face, in particular the base region of the feeder body.
  • the sleeve and the feeder body are therefore two different components of the feeder insert.
  • the shell is formed in particular from a dimensionally stable body, for example from a metal sheet or a suitable plastic, wherein the shell can in particular have a wall thickness of a maximum of 2 mm [millimeters], particularly preferably a maximum of 1 mm.
  • the shell consisting of sheet metal is produced in a deep-drawing process.
  • the casing can be connected to the feeder body in particular in the base area and / or cover area, in particular in a materially bonded manner, for example by means of adhesive, or in a non-positive manner.
  • a large number (at least three, preferably at least five or more) be provided by spacers, which counteract a radial deformation of the shell in the direction of the outer contour of the feeder body.
  • spacers can in principle be arranged and fastened as independent components between the inside of the casing and the outer contour of the feeder body.
  • the spacers are formed in one piece with the casing or with the feeder body.
  • the outer contour of the feeder body can have a plurality of outer contour projections against which the inside of the casing rests.
  • the shell for example made of sheet metal, can, however, have, for example, embossments, beads, projections or the like as spacers.
  • the casing could, for example, have a wave-shaped or zigzag-shaped design, with the corresponding low points being able to lie against the outer contour of the feeder body as spacers.
  • the spacers are in particular arranged regularly distributed over the outer contour of the feeder body.
  • the spacers are punctiform, a single coherent cavity can be formed between the casing and the outer contour of the feeder body.
  • the spacers it is also possible for the spacers to extend over the length or over the entire circumference of the outer contour, so that a plurality of cavities separated from one another are formed.
  • the casing surrounding the feeder body radially on the outside in the circumferential direction preferably extends from the bottom region over at least half the length of the feeder body.
  • the casing surrounding the feeder body in the circumferential direction preferably extends over two thirds of the length of the feeder body or even over the entire length of the feeder body.
  • the casing has a base section which extends over the end face of the feeder body in the base area of the feeder body and in particular is in contact with the base area of the feeder body at least in sections, the casing having an opening assigned to the feeder opening of the feeder body in the base section , the opening of the shell being smaller than the feeder opening.
  • a (metallic) breaker core is simultaneously provided by the shell, which constricts the connection between the feeder opening and the casting and thus defines a predetermined breaking point for the metal feeder residue located in the feeder cavity after the casting process.
  • the bottom section of the shell can be designed in such a way that, starting from the feeder opening of the feeder body, it tapers to its opening facing the casting.
  • the casing of the casing surrounding the feeder body in the circumferential direction and the bottom section of the casing forming the breaker core can thus be manufactured in one piece.
  • the casing can thus be attached to the in particular one-piece feeder body in a second process step after it has been produced.
  • the outer contour preferably has a large number (at least three, preferably at least five or particularly preferably at least ten) of outer contour projections and / or outer contour recesses.
  • a large number at least three, preferably at least five or particularly preferably at least ten
  • the feeder body is made in particular of granular and / or fibrous feeder material and is preferably made of exothermic material, thus comprises at least one oxidizable material, for example an oxidizable metal, an oxidizing agent, possibly fillers and / or fibers and a binding agent.
  • oxidizable material for example an oxidizable metal, an oxidizing agent, possibly fillers and / or fibers and a binding agent.
  • the external contour projections and / or external contour recesses can have any shape.
  • the outer contour projections / outer contour recesses can, for example, be cube-shaped, cuboid, dome-shaped, pyramidal or trapezoidal in section, with the edges being able to be rounded.
  • the outwardly directed surface of the outer contour projection can be curved in the circumferential direction in accordance with the radius of the feeder body at the corresponding point.
  • the outer contour projections and / or the outer contour recesses have a height or a depth that is in particular at least 5%, preferably at least 10% and at most 45%, preferably at most 20% of the maximum outer diameter of the feeder body.
  • the outer contour projections and / or outer contour recesses preferably extend elongated in one direction and in particular along a longitudinal axis defined by the feeder opening of the feeder body.
  • the elongated external contour projections / external contour recesses extend, in particular, starting from the base area or the cover area.
  • the cross-sectional design of the elongated external contour projections and / or external contour recesses can be arbitrary, but is preferably rectangular or triangular, optionally with rounded edges.
  • the outwardly directed surface of the elongated outer contour projection is also curved in the circumferential direction corresponding to the radius of the feeder body at the corresponding point.
  • the outer contour projections and / or outer contour recesses each extend along the entire side wall of the feeder body.
  • the elongated outer contour projections and / or outer contour recesses are preferably arranged uniformly one behind the other in the circumferential direction, with a total of at most 9, preferably at most 6, outer contour projections and / or outer contour recesses being able to be provided.
  • the outer contour of the feeder body has a lamellar shape.
  • a corresponding core box for producing a feeder body can have elongated recesses / projections corresponding to the outer contour projections and / or outer contour recesses on its inner surface which defines the outer contour.
  • a width of the outer contour projections and / or the outer contour recesses and / or a distance between adjacent outer contour projections / outer contour recesses changes along their length, in particular along the longitudinal axis of the feeder body.
  • an inner contour of the feeder body facing the feeder cavity tapers in its cross-sectional configuration, starting from the base area having the feeder opening, to the opposite cover area.
  • the inner contour therefore does not have a concave shape.
  • the feeder body can thus be manufactured in one piece in a single process step without a lost core.
  • the outer contour projections extending along the longitudinal axis of the feeder body are designed in particular so that they are arranged directly adjacent to one another in the circumferential direction of the feeder body, the feet of the projections (in their cross-sectional configuration) merging directly into one another.
  • a feeder body produced in a corresponding core box can thus be removed from the core box in the direction of the longitudinal axis after its production.
  • the core box accordingly has, on its inside, which defines the outer contour of the feeder body, projections or recesses that taper in one direction and extend in a straight line.
  • the outer contour projections have a bevel on their (front) side facing the feeder opening, wherein in particular projections adjacent in the circumferential direction can have different angles of the bevel.
  • the projections of the outer contour can be pointed or rounded.
  • the figures show a feeder body 1 which has a circumferential side wall 2 which extends from a base area 11 along a longitudinal axis 7 to a cover area 12.
  • the side wall 2 delimits a feeder cavity 4 with an inner contour 14.
  • a feeder opening 5 adjoins the feeder cavity 4, via which the feeder cavity 4 is connected to the mold cavity of the casting mold during the casting process.
  • the side wall 2 has on its outside an outer contour 3 with a plurality of outer contour projections 6 extending along the longitudinal axis 7, which are arranged one behind the other in the circumferential direction of the feeder body 1 and, starting from the bottom area 13, extend over approximately three quarters of the length of the feeder body 1 .
  • the feeder body 1 thus has a lamellar outer contour in the lower area.
  • the outer contour projections 6 have a width 8 which increases along the longitudinal axis 7 from the base area 11 to the cover area 12, so that the width of a cavity 10 between two adjacent outer contour projections 6 decreases.
  • the feeder insert shown in the figures has, in addition to the feeder body 1, a sleeve 9 which surrounds the lower area of the feeder body 1 in the area of the outer contour projections 6 in the circumferential direction.
  • the inside of the casing 9 lies against the outside of the outer contour projections 6 in the area of the side wall 2.
  • the casing 9 also covers the bottom area 11 of the feeder body 1, an opening 13 of the casing 9 being smaller than the feeder opening 5.
  • the sleeve 9 prevents molding material from getting between the outer contour projections 6 during the molding process, so that air-filled cavities 10 are formed which are delimited by adjacent outer contour projections 6 and the sleeve 9 and at their upper ends by the feeder body 1 itself. These cavities 10 provide insulation during the casting process.

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

Abstract

Die vorliegende Erfindung betrifft einen Speisereinsatz zum Einsetzen in eine beim Gießen von Metallen verwendete Gießform, umfassend einen aus einem isolierenden und/oder exothermen Speisermaterial bestehenden Speiserkorpus (1), aufweisend- eine umlaufende Seitenwand (2), wobei die Seitenwand (2) eine nach außen gerichtete Außenkontur (3),- einen zumindest von der Seitenwand (2) begrenzten Speiserhohlraum (4) zur Aufnahme von flüssigem Metall und- eine Speiseröffnung (5) zum Verbinden des Speiserhohlraums (4) mit einem Formhohlraum der Gießform während des Gießvorganges.The present invention relates to a feeder insert for insertion into a casting mold used in the casting of metals, comprising a feeder body (1) consisting of an insulating and / or exothermic feeder material, having a circumferential side wall (2), the side wall (2) having an after outwardly directed outer contour (3), - a feeder cavity (4) bounded at least by the side wall (2) for receiving liquid metal and - a feeder opening (5) for connecting the feeder cavity (4) to a mold cavity of the casting mold during the casting process.

Description

Die vorliegende Erfindung betrifft einen Speisereinsatz zum Einsetzen in eine beim Gießen von Metallen verwendete Gießform, umfassend einen aus einem isolierenden und/oder exothermen Speisermaterial bestehenden Speiserkorpus, wobei der Speiserkorpus eine umlaufende und eine nach außen gerichtete Außenkontur aufweisende Seitenwand, einen zumindest von der Seitenwand begrenzten Speiserhohlraum zur Aufnahme von flüssigem Metall und eine Speiseröffnung zum Verbinden des Speiserhohlraums mit einem Formhohlraum der Gießform während des Gießvorganges. Die Speiseröffnung ist in der Regel in einem Bodenbereich des Speiserkorpus ausgebildet, wobei der Speiserhohlraum auf der dem Bodenbereich gegenüberliegenden Seite von einem Deckelbereich begrenzt ist, wobei in dem Deckelbereich eine weitere Öffnung ausgebildet sein kann.The present invention relates to a feeder insert for insertion into a casting mold used in the casting of metals, comprising a feeder body consisting of an insulating and / or exothermic feeder material, the feeder body having a circumferential and outwardly directed outer contour, one at least limited by the side wall Feeder cavity for receiving liquid metal and a feeder opening for connecting the feeder cavity to a mold cavity of the casting mold during the casting process. The feeder opening is generally formed in a bottom area of the feeder body, the feeder cavity being delimited by a cover area on the side opposite the bottom area, with a further opening being able to be formed in the cover area.

In der Gießereitechnik ist es häufig notwendig, in den Gießformen zusätzliche Speisereinsätze anzuordnen, deren Speiserkorpus sich beim Abguss des Gussstückes mit dem flüssigen Metall füllt und bei der Erstarrung des Gussstückes auftretende Volumendefizite ausgleicht, um eine Lunkerbildung im Gussstück zu verhindern. Dazu müssen die Speisereinsätze 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. Hierbei soll der sogenannte Modul des Speisereinsatzes größer sein als der Modul des jeweiligen Knotenpunktes des abzugießenden Gussstückes. Die Speisereinsätze weisen hierzu den von dem Speiserkorpus begrenzten Speiserhohlraum zur Aufnahme von flüssigem Metall auf sowie eine Speiseröffnung zum Verbinden des Speiserhohlraums mit dem Formhohlraum der Gießform während des Gießvorganges. Um die spätere Erstarrung des in dem Speiserhohlraum eintretenden flüssigen Metalls zu gewährleisten, besteht der Speiserhohlraum aus einem exothermen und/oder isolierenden Speisermaterial.In foundry technology, it is often necessary to arrange additional feeder inserts in the casting molds, the feeder body of which fills with the liquid metal when the casting is poured and compensates for any volume deficits that occur during the solidification of the casting, in order to prevent voids in the casting. For this purpose, the feeder inserts must be designed in such a way that the liquid metal fed into them solidifies later than the casting so that material can be transported to the casting during the solidification process, which tightly feeds the casting. The so-called Module of the feeder insert must be larger than the module of the respective node point of the casting to be cast. For this purpose, the feeder inserts have the feeder cavity delimited by the feeder body for receiving liquid metal and a feeder opening for connecting the feeder cavity to the mold cavity of the casting mold during the casting process. In order to ensure the subsequent solidification of the liquid metal entering the feeder cavity, the feeder cavity consists of an exothermic and / or insulating feeder material.

Aus der EP 0 888 199 B1 sind geeignete Materialmischungen für das Speisermaterial zur Herstellung des Speiserkorpus bekannt. Demnach soll das exotherme Material ein oxidierbares Metall und ein Oxidationsmittel umfassen, welche eine exotherme Reaktion erzeugen können, wobei auch bereits vorgeschlagen ist, der Materialmischung Bestandteile eines isolierenden feuerfesten Materials zuzusetzen, so dass sich eine exotherm-isolierende Materialmischung ergibt. Im Gegensatz zu aus exothermem Material bestehenden Speisern ist mangels einer aktiven Wärmezufuhr während des Erstarrungsvorgangs der Wärmehaushalt reiner Isolierspeiser schlechter.From the EP 0 888 199 B1 Suitable material mixtures for the feeder material for producing the feeder body are known. Accordingly, the exothermic material should comprise an oxidizable metal and an oxidizing agent, which can produce an exothermic reaction, it has also already been proposed to add constituents of an insulating refractory material to the material mixture, so that an exothermic-insulating material mixture results. In contrast to feeders made of exothermic material, the heat balance of pure insulating feeders is worse due to the lack of an active heat supply during the solidification process.

Im Gegensatz zu aus exothermem/isolierendem körnigem Speisermaterial hergestellten Speiserkorpussen sind auch Speiserkorpusse aus einem reinen Metallkörper bekannt. Ein solcher formstabiler, metallischer Speiser ist beispielsweise in EP 1 864 729 A2 beschrieben. Da bei diesen Speisereinsätzen keine exotherme Reaktion stattfindet, wird nur auf die isolierende Wirkung abgestellt. Da der formstabile Metallkörper nicht aufschmelzen darf, benötigt er eine entsprechende Wandung, die dem flüssigen Metall bei Berührung die Wärme entzieht, wobei es dadurch zur Randschalenbildung am metallischen Speiserrest kommen kann. Zudem können beim Gießprozess entstandene Gase nicht abgeführt werden und es kann zu sogenannten Gasfehlern oder Gasexplosionen im Speiserinneren kommen.In contrast to feeder bodies made of exothermic / insulating granular feeder material, feeder bodies made of a pure metal body are also known. Such a dimensionally stable, metallic feeder is for example in EP 1 864 729 A2 described. Since there is no exothermic reaction with these feeder inserts, only the insulating effect is taken into account. Since the dimensionally stable metal body must not melt, it requires a corresponding wall that removes heat from the liquid metal when it is touched, which can lead to the formation of edge shells on the metal feeder residue. In addition, gases generated during the casting process cannot be discharged and so-called gas defects or gas explosions can occur inside the feeder.

Um die Isolierwirkung eines Speisereinsatzes zu erhöhen, ist beispielsweise aus EP 2 489 449 B1 bekannt, einen aus exothermen Speisermaterial bestehenden Speiserkorpus mit einer aus isolierendem feuerfesten Material bestehenden Schale zu umschließen. Das Herstellen einer solchen aus feuerfestem Material bestehenden Schale ist aber relativ kostenintensiv.To increase the insulating effect of a feeder insert, for example, is off EP 2 489 449 B1 known to enclose a feeder body made of exothermic feeder material with a shell made of insulating refractory material. However, the manufacture of such a shell made of refractory material is relatively expensive.

Aus EP 3 009 209 A1 ist es daher bekannt, von dem Speisermaterial vollständig umgebene Lufthohlräume im Inneren des Speiserkorpus als zusätzlicher Isolator anzuordnen. Ein Nachteil einer solchen Ausgestaltung liegt aber darin, dass bei einer exothermen Reaktion des radial außen zu den Lufthohlräumen angeordneten Speisermaterials die entstehende thermische Energie ebenfalls durch die Lufthohlräume isoliert ist, so dass die entstehende Wärme in den den Speisereinsatz umgebenden Formstoff abgegeben wird. Dies ist insbesondere nachteilig, da ein Speisereinsatz bei der exothermen Reaktion von innen nach außen brennt und die für die Nachspeisung erforderliche thermische Energie am Ende des Gießvorganges verloren geht.Out EP 3 009 209 A1 It is therefore known to arrange air cavities completely surrounded by the feeder material in the interior of the feeder body as an additional insulator. However, a disadvantage of such a configuration is that in the event of an exothermic reaction of the feeder material arranged radially on the outside of the air cavities, the resulting thermal energy is also isolated by the air cavities, so that the resulting heat is released into the molding material surrounding the feeder insert. This is particularly disadvantageous since a feeder insert burns from the inside out during the exothermic reaction and the thermal energy required for the make-up is lost at the end of the casting process.

Zur Erhöhung des Moduls eines Speisereinsatzes ist aus EP 0 779 844 B1 ein Speisereinsatz mit einem exothermen Speiserkorpus bekannt, bei dem die Seitenwandung des Speiserkorpus von dem oberen Wandungsteil ausgehend konvex nach außen gebogen verläuft und am unteren Ende in ein auch als Speiserhals bezeichnetes Durchlassteil übergeht, wobei die Seitenwandung mehrere in den Innenraum ragende Spanten aufweist, welche an den Enden in die obere Wandung beziehungsweise das Durchlassteil übergehen. Der Speiserkorpus kann entweder aus mehreren getrennt hergestellten Teilen zusammengesetzt werden oder unter Verwendung eines verlorenen Kerns einteilig hergestellt werden. Allerdings ist die Verwendung eines verlorenen Kerns bei der Herstellung aufwendig.To increase the module of a feeder insert is off EP 0 779 844 B1 a feeder insert is known with an exothermic feeder body, in which the side wall of the feeder body extends convexly outwards starting from the upper wall part and merges at the lower end into a passage part also known as the feeder neck, the side wall having several ribs protruding into the interior, which at the ends merge into the upper wall or the passage part. The feeder body can either be assembled from several separately manufactured parts or manufactured in one piece using a lost core. However, the use of a lost core in production is expensive.

Da die heutigen Gussstücke einerseits aufgrund einer komplexer werdenden Formgebung bezüglich ihrer Speisung während des Gießprozesses immer anspruchsvoller werden und andererseits auch die räumliche Positionierung von Speisereinsätzen in den Gießformen immer schwieriger wird, liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen Speisereinsatz bereitzustellen, der auf alternative Weise bei gleicher Speisermasse und gleichem Speiserhohlraumvolumen ein höheres Modul zur Verfügung stellt.Since today's castings are on the one hand more complex with regard to their feeding during the casting process and on the other hand the spatial positioning of feeder inserts in the casting molds is becoming more and more difficult, the object of the present invention is to provide a feeder insert that can be used in an alternative way provides a higher module with the same feeder mass and the same feeder cavity volume.

Die Aufgabe wird insbesondere durch einen Speisereinsatz mit den eingangs genannten Merkmalen gelöst, wobei der Speisereinsatz zusätzlich zu dem Speiserkorpus eine Hülle umfasst, wobei die Hülle die Außenkontur zumindest abschnittsweise umgibt und zwischen der Hülle und der Außenkontur mindestens ein Hohlraum ausgebildet ist.The object is achieved in particular by a feeder insert with the features mentioned at the beginning, the feeder insert comprising a casing in addition to the feeder body, the casing at least partially surrounding the outer contour and at least one cavity being formed between the casing and the outer contour.

Die Erfindung sieht in ihrem Grundgedanken also vor, dass der aus einem körnigen und/oder faserartigen Speisermaterial hergestellte Speiserkorpus zumindest entlang eines Längsabschnittes in Umfangsrichtung von einer Hülle umgeben ist, wobei zwischen zumindest einem Abschnitt der Innenseite der Hülle und einem Abschnitt der Außenkontur ein mit Luft gefüllter Hohlraum ausgebildet ist. Der Speisereinsatz weist also eine durch den mindestens einen Hohlraum gebildete Isolierung auf, die während des Gießvorgangs die Wärmemenge vermindert, die von dem Speiserkorpus an den den Speisereinsatz umgebenden Formstoff abgegeben wird. Bei einer entsprechenden Dimensionierung des Speisereinsatzes weist dieser im Vergleich zu herkömmlichen Speisereinsätzen (ohne Hülle) entweder ein höheres Modul bei gleichem Gewicht beziehungsweise gleichem Volumen des Speiserkorpus oder einen gleichen Modul bei einem geringeren Gewicht beziehungsweise kleinerem Volumen des Speiserkorpus auf.The basic idea of the invention therefore provides that the feeder body made of a granular and / or fiber-like feeder material is surrounded by a casing at least along a longitudinal section in the circumferential direction, with air between at least one section of the inside of the casing and a section of the outer contour filled cavity is formed. The feeder insert thus has insulation formed by the at least one cavity, which during the casting process reduces the amount of heat that is given off from the feeder body to the molding material surrounding the feeder insert. With a corresponding dimensioning of the feeder insert, it has either a higher module with the same weight or the same volume of the feeder body or the same module with a lower weight or smaller volume of the feeder body compared to conventional feeder inserts (without casing).

Es ist allerdings nicht zwingend erforderlich, dass der Hohlraum auch in axialer Längsrichtung des Speiserkorpus von der Hülle begrenzt ist. Vielmehr kann der mindestens eine Hohlraum an beispielsweise seinem oberen, dem Deckelbereich zugewandten Ende von dem Speiserkorpus selbst verschlossen sein. Bevorzugt ist, dass der mindestens eine Hohlraum an einer Seite in axialer Längsrichtung, insbesondere in Richtung des Bodenbereiches von der Hülle begrenzt ist.However, it is not absolutely necessary that the cavity is also delimited by the casing in the axial longitudinal direction of the feeder body. Rather, the at least one cavity can be closed by the feeder body itself at, for example, its upper end facing the cover area. It is preferred that the at least one cavity is delimited by the shell on one side in the axial longitudinal direction, in particular in the direction of the bottom area.

Die Hülle kann insbesondere topfförmig ausgebildet sein, wobei die Hülle zumindest einen gegebenenfalls eine Öffnung aufweisenden Bodenabschnitt aufweist, der an einer Stirnseite insbesondere des Bodenbereichs des Speiserkorpus anliegt.The casing can in particular be designed in the shape of a pot, the casing having at least one base section which may have an opening and which rests against an end face, in particular the base region of the feeder body.

Die Hülle und der Speiserkorpus sind also zwei unterschiedliche Bauteile des Speisereinsatzes.The sleeve and the feeder body are therefore two different components of the feeder insert.

Die Hülle ist insbesondere aus einem formstabilen Körper gebildet, beispielsweise aus einem metallischen Blech oder einem geeigneten Kunststoff, wobei die Hülle insbesondere eine Wandstärke von maximal 2 mm [Millimeter], besonders bevorzugt von maximal 1 mm aufweisen kann. Insbesondere wird die aus einem Blech bestehende Hülle in einem Tiefziehverfahren hergestellt.The shell is formed in particular from a dimensionally stable body, for example from a metal sheet or a suitable plastic, wherein the shell can in particular have a wall thickness of a maximum of 2 mm [millimeters], particularly preferably a maximum of 1 mm. In particular, the shell consisting of sheet metal is produced in a deep-drawing process.

Die Hülle kann insbesondere im Bodenbereich und/oder Deckelbereich mit dem Speiserkorpus insbesondere stoffschlüssig, beispielsweise durch Klebstoff, oder kraftschlüssig verbunden sein.The casing can be connected to the feeder body in particular in the base area and / or cover area, in particular in a materially bonded manner, for example by means of adhesive, or in a non-positive manner.

Um zu verhindern, dass sich die Hülle während eines Formvorganges einer Gießform ungewollt aufgrund des druckbeaufschlagten Fomstoffes verformt, können eine Vielzahl (mindestens drei, bevorzugt mindestens fünf oder mehr) von Abstandshaltern vorgesehen sein, die einer radialen Verformung der Hülle in Richtung der Außenkontur des Speiserkorpus entgegenwirken. Solche Abstandshalter können prinzipiell als eigenständige Bauteile zwischen der Innenseite der Hülle und der Außenkontur des Speiserkorpus angeordnet und befestigt sein. Bevorzugt ist jedoch, dass die Abstandshalter einteilig mit der Hülle oder mit dem Speiserkorpus ausgebildet sind. Beispielsweise kann die Außenkontur des Speiserkorpus eine Vielzahl von Außenkonturvorsprüngen aufweisen, an denen die Innenseite der Hülle anliegt. Die beispielsweise aus Blech ausgebildete Hülle kann hingegen beispielsweise Prägungen, Sicken, Vorsprünge oder ähnliches als Abstandshalter aufweisen. Alternativ könnte die Hülle beispielsweise wellenförmig oder zickzackförmig ausgebildet sein, wobei die entsprechenden Tiefpunkte als Abstandshalter an der Außenkontur des Speiserkorpus anliegen können.In order to prevent the shell from being inadvertently deformed during a molding process of a casting mold due to the pressurized molding material, a large number (at least three, preferably at least five or more) be provided by spacers, which counteract a radial deformation of the shell in the direction of the outer contour of the feeder body. Such spacers can in principle be arranged and fastened as independent components between the inside of the casing and the outer contour of the feeder body. However, it is preferred that the spacers are formed in one piece with the casing or with the feeder body. For example, the outer contour of the feeder body can have a plurality of outer contour projections against which the inside of the casing rests. The shell, for example made of sheet metal, can, however, have, for example, embossments, beads, projections or the like as spacers. As an alternative, the casing could, for example, have a wave-shaped or zigzag-shaped design, with the corresponding low points being able to lie against the outer contour of the feeder body as spacers.

Die Abstandshalter sind insbesondere regelmäßig über die Außenkontur des Speiserkorpus verteilt angeordnet.The spacers are in particular arranged regularly distributed over the outer contour of the feeder body.

Wenn die Abstandshalter punktförmig ausgebildet sind, so kann ein einziger zusammenhängender Hohlraum zwischen Hülle und Außenkontur des Speiserkorpus ausgebildet werden. Es ist aber auch möglich, dass sich die Abstandshalter über die Länge oder über den gesamten Umfang der Außenkontur erstrecken, so dass mehrere voneinander getrennte Hohlräume ausgebildet werden.If the spacers are punctiform, a single coherent cavity can be formed between the casing and the outer contour of the feeder body. However, it is also possible for the spacers to extend over the length or over the entire circumference of the outer contour, so that a plurality of cavities separated from one another are formed.

Die den Speiserkorpus radial außen in Umfangsrichtung umgebende Hülle erstreckt sich bevorzugt von dem Bodenbereich über mindestens die Hälfte der Länge des Speiserkorpus. Bevorzugt erstreckt sich die den Speiserkorpus in Umfangsrichtung umgebende Hülle über zwei Drittel der Länge des Speiserkorpus oder sogar über die gesamte Länge des Speiserkorpus. Bevorzugt liegt die hülsenförmige oder topfförmige Hülle mit ihrer Innenfläche an den radial äußersten Stellen aller Außenkonturvorsprünge des Speiserkorpus an.The casing surrounding the feeder body radially on the outside in the circumferential direction preferably extends from the bottom region over at least half the length of the feeder body. The casing surrounding the feeder body in the circumferential direction preferably extends over two thirds of the length of the feeder body or even over the entire length of the feeder body. Preferably lies the sleeve-shaped or pot-shaped casing with its inner surface at the radially outermost points of all outer contour projections of the feeder body.

In einer bevorzugten Ausführungsform weist die Hülle einen Bodenabschnitt auf, der sich über die Stirnseite des Speiserkorpus im Bodenbereich des Speiserkorpus erstreckt und insbesondere mit dem Bodenbereich des Speiserkorpus zumindest abschnittsweise in Anlage ist, wobei die Hülle in dem Bodenabschnitt eine der Speiseröffnung des Speiserkorpus zugeordnete Öffnung aufweist, wobei die Öffnung der Hülle kleiner ist als die Speiseröffnung. Auf diese Weise wird durch die Hülle gleichzeitig ein (metallischer) Brechkern zur Verfügung gestellt, der die Verbindung zwischen der Speiseröffnung und dem Gussstück einschnürt und somit eine Sollbruchstelle für den nach dem Gießvorgang im Speiserhohlraum befindlichen metallischen Speiserrest vorgibt. Die Hülle kann in ihrem Bodenabschnitt so ausgebildet sein, dass sie sich ausgehend von der Speiseröffnung des Speiserkorpus zu ihrer dem Gussstück zugewandten Öffnung verjüngt. Der den Speiserkorpus in Umfangsrichtung umgebende Mantel der Hülle und der den Brechkern ausbildende Bodenabschnitt der Hülle können somit einteilig herstellbar sein. Die Hülle kann somit in einem zweiten Prozessschritt nach Herstellung des insbesondere einteiligen Speiserkorpus an diesem angebracht werden.In a preferred embodiment, the casing has a base section which extends over the end face of the feeder body in the base area of the feeder body and in particular is in contact with the base area of the feeder body at least in sections, the casing having an opening assigned to the feeder opening of the feeder body in the base section , the opening of the shell being smaller than the feeder opening. In this way, a (metallic) breaker core is simultaneously provided by the shell, which constricts the connection between the feeder opening and the casting and thus defines a predetermined breaking point for the metal feeder residue located in the feeder cavity after the casting process. The bottom section of the shell can be designed in such a way that, starting from the feeder opening of the feeder body, it tapers to its opening facing the casting. The casing of the casing surrounding the feeder body in the circumferential direction and the bottom section of the casing forming the breaker core can thus be manufactured in one piece. The casing can thus be attached to the in particular one-piece feeder body in a second process step after it has been produced.

Bevorzugt weist die Außenkontur eine Vielzahl (mindestens drei, bevorzugt mindestens fünf oder besonders bevorzugt mindestens zehn) von Außenkonturvorsprüngen und/oder Außenkonturrücksprüngen auf. Bei der Ausbildung von Außenkonturvorsprüngen liegt die Hülle mit ihrer Innenseite an den Außenkonturvorsprüngenan.The outer contour preferably has a large number (at least three, preferably at least five or particularly preferably at least ten) of outer contour projections and / or outer contour recesses. When the outer contour projections are formed, the inside of the casing rests against the outer contour projections.

Es kann also insbesondere vorgesehen sein, dass auf der radial nach außen ausgerichteten Außenseite des Speiserkorpus viele regelmäßig oder unregelmäßig angeordnete, lokal vorspringende Vorsprünge (Erhebungen) und/oder lokal rückspringende Rücksprünge (Vertiefungen) ausgebildet sind. Bei einer entsprechenden Dimensionierung des Speiserkorpus weist dieser im Vergleich zu herkömmlichen Speiserkorpussen (ohne Vorsprünge und Rücksprünge auf der Außenseite) ein höheres Modul bei gleichem Gewicht beziehungsweise gleichem Volumen des Speiserkorpus auf. Die Außenkonturvorsprünge dienen zudem als Auflagepunkte/-fläche für die Hülle.It can therefore be provided in particular that on the radially outwardly oriented outer side of the feeder body many regularly or irregularly arranged, locally protruding projections (elevations) and / or locally recessed recesses (depressions) are formed. With a corresponding dimensioning of the feeder body, it has a higher module compared to conventional feeder bodies (without projections and recesses on the outside) with the same weight or the same volume of the feeder body. The outer contour projections also serve as support points / surfaces for the shell.

Der Speiserkorpus ist insbesondere aus körnigem und/oder faserartigem Speisermaterial hergestellt und bevorzugt aus exothermem Material hergestellt, umfasst also wenigstens ein oxidierbares Material, beispielsweise ein oxidierbares Metall, ein Oxidationsmittel, ggf. Füllstoffe und/oder Fasern sowie ein Bindemittel.The feeder body is made in particular of granular and / or fibrous feeder material and is preferably made of exothermic material, thus comprises at least one oxidizable material, for example an oxidizable metal, an oxidizing agent, possibly fillers and / or fibers and a binding agent.

Prinzipiell können die Außenkonturvorsprünge und/oder Außenkonturrücksprünge jede beliebige Gestalt haben. So können die Außenkonturvorsprünge/Außenkonturrücksprünge beispielsweise würfelförmig, quaderförmig, kalottenförmig, pyramidenförmig oder im Schnitt trapezförmig ausgebildet sein, wobei die Kanten abgerundet sein können. Zur Ausbildung einer Auflagefläche für die Hülle kann die nach außen gerichtete Oberfläche des Außenkonturvorsprungs in Umfangrichtung entsprechend dem Radius des Speiserkorpus an der entsprechenden Stelle gekrümmt sein.In principle, the external contour projections and / or external contour recesses can have any shape. Thus, the outer contour projections / outer contour recesses can, for example, be cube-shaped, cuboid, dome-shaped, pyramidal or trapezoidal in section, with the edges being able to be rounded. To form a support surface for the casing, the outwardly directed surface of the outer contour projection can be curved in the circumferential direction in accordance with the radius of the feeder body at the corresponding point.

Die Außenkonturvorsprünge und/oder die Außenkonturrücksprünge haben eine Höhe beziehungsweise eine Tiefe, die insbesondere mindestens 5%, bevorzugt mindestens 10% und höchstens 45%, bevorzugt höchstens 20 % des maximalen Außendurchmessers des Speiserkorpus beträgt.The outer contour projections and / or the outer contour recesses have a height or a depth that is in particular at least 5%, preferably at least 10% and at most 45%, preferably at most 20% of the maximum outer diameter of the feeder body.

Zur einfachen Herstellung erstrecken sich die Außenkonturvorsprünge und/oder Außenkonturrücksprünge bevorzugt länglich in eine Richtung und insbesondere entlang einer durch die Speiseröffnung definierten Längsachse des Speiserkorpus. Die länglichen Außenkonturvorsprünge/Außenkonturrücksprünge erstrecken sich insbesondere ausgehend von dem Bodenbereich oder dem Deckelbereich. Die Querschnittsgestaltung der länglichen Außenkonturvorsprünge und/oder Außenkonturrücksprünge kann beliebig sein, ist aber bevorzugt rechteckförmig oder dreiecksförmig, gegebenenfalls mit abgerundeten Kanten. Insbesondere zur Ausbildung einer Auflagefläche für die Hülle ist die nach außen gerichtete Oberfläche auch des länglichen Außenkonturvorsprungs zudem in Umfangrichtung entsprechend dem Radius des Speiserkorpus an der entsprechenden Stelle gekrümmt.For simple production, the outer contour projections and / or outer contour recesses preferably extend elongated in one direction and in particular along a longitudinal axis defined by the feeder opening of the feeder body. The elongated external contour projections / external contour recesses extend, in particular, starting from the base area or the cover area. The cross-sectional design of the elongated external contour projections and / or external contour recesses can be arbitrary, but is preferably rectangular or triangular, optionally with rounded edges. In particular, to form a support surface for the casing, the outwardly directed surface of the elongated outer contour projection is also curved in the circumferential direction corresponding to the radius of the feeder body at the corresponding point.

In einer Ausführungsform erstrecken sich die Außenkonturvorsprünge und/oder Außenkonturrücksprünge jeweils entlang der gesamten Seitenwand des Speiserkorpus.In one embodiment, the outer contour projections and / or outer contour recesses each extend along the entire side wall of the feeder body.

Bevorzugt sind die länglichen Außenkonturvorsprünge und/oder Außenkonturrücksprünge in Umfangsrichtung gleichmäßig hintereinander angeordnet, wobei insgesamt höchstens 9 bevorzugt höchstens 6 Außenkonturvorsprünge und/oder Außenkonturrücksprünge vorgesehen sein können. Die Außenkontur des Speiserkorpus weist in diesem Fall eine lamellenartige Gestalt auf. Ein solcher Speiserkorpus ist besonders einfach in einem einzigen Prozessschritt herstellbar. So kann ein entsprechender Kernkasten zur Herstellung eines Speiserkorpus auf seiner die Außenkontur vorgebenden Innenfläche den Außenkonturvorsprüngen und/oder Außenkonturrücksprüngen entsprechende längliche Rücksprünge/Vorsprünge aufweisen.The elongated outer contour projections and / or outer contour recesses are preferably arranged uniformly one behind the other in the circumferential direction, with a total of at most 9, preferably at most 6, outer contour projections and / or outer contour recesses being able to be provided. In this case, the outer contour of the feeder body has a lamellar shape. Such a feeder body is particularly easy to manufacture in a single process step. For example, a corresponding core box for producing a feeder body can have elongated recesses / projections corresponding to the outer contour projections and / or outer contour recesses on its inner surface which defines the outer contour.

In diesem Zusammenhang ist es besonders bevorzugt, wenn sich eine Breite der Außenkonturvorsprünge und/oder der Außenkonturrücksprünge und oder ein Abstand zwischen benachbarten Außenkonturvorsprünge/Außenkonturrücksprünge entlang ihrer Länge insbesondere entlang der Längsachse des Speiserkorpus ändert. Insbesondere nimmt ein Abstand zwischen zwei benachbarten Außenkonturvorsprüngen von dem Bodenbereich des Speiserkorpus zu dem Deckelbereich ab. Dies ist insbesondere auch dann vorteilhaft, wenn eine dem Speiserhohlraum zugewandte Innenkontur des Speiserkorpus sich in ihrer Querschnittsgestaltung ausgehend von dem die Speiseröffnung aufweisenden Bodenbereich zu dem gegenüberliegenden Deckelbereich verjüngt. Die Innenkontur weist somit keine konkave Form auf. Somit kann der Speiserkorpus einteilig in einem einzigen Prozessschritt ohne verlorenen Kern hergestellt werden.In this context, it is particularly preferred if a width of the outer contour projections and / or the outer contour recesses and / or a distance between adjacent outer contour projections / outer contour recesses changes along their length, in particular along the longitudinal axis of the feeder body. In particular, there is a distance between two adjacent outer contour projections from the bottom area of the feeder body to the cover area. This is also particularly advantageous if an inner contour of the feeder body facing the feeder cavity tapers in its cross-sectional configuration, starting from the base area having the feeder opening, to the opposite cover area. The inner contour therefore does not have a concave shape. The feeder body can thus be manufactured in one piece in a single process step without a lost core.

Die sich entlang der Längsachse des Speiserkorpus erstreckenden Außenkonturvorsprünge sind insbesondere so ausgebildet, dass sie in Umfangsrichtung des Speiserkorpus unmittelbar benachbart zueinander angeordnet sind, wobei die Füße der Vorsprünge (in ihrer Querschnittsgestaltung) unmittelbar ineinander übergehen.The outer contour projections extending along the longitudinal axis of the feeder body are designed in particular so that they are arranged directly adjacent to one another in the circumferential direction of the feeder body, the feet of the projections (in their cross-sectional configuration) merging directly into one another.

Somit kann ein in einem entsprechenden Kernkasten hergestellter Speiserkorpus in Richtung der Längsachse aus dem Kernkasten nach seiner Herstellung entnommen werden. Der Kernkasten weist dementsprechend auf seiner die Außenkontur des Speiserkorpus vorgebenden Innenseite sich in eine Richtung verjüngende gradlinig erstreckende Vorsprünge beziehungsweise Rücksprünge auf.A feeder body produced in a corresponding core box can thus be removed from the core box in the direction of the longitudinal axis after its production. The core box accordingly has, on its inside, which defines the outer contour of the feeder body, projections or recesses that taper in one direction and extend in a straight line.

In einer weiteren Ausführungsform kann zudem vorgesehen sein, dass die Außenkonturvorsprünge auf ihrer der Speiseröffnung zugewandten (Stirn-)Seite eine Fase aufweisen, wobei insbesondere in Umfangsrichtung benachbarte Vorsprünge unterschiedliche Winkel der Fase aufweisen können.In a further embodiment it can also be provided that the outer contour projections have a bevel on their (front) side facing the feeder opening, wherein in particular projections adjacent in the circumferential direction can have different angles of the bevel.

In radialer Richtung können die Vorsprünge der Außenkontur spitz oder abgerundet zulaufen.In the radial direction, the projections of the outer contour can be pointed or rounded.

Die Erfindung sowie das technische Umfeld werden nachfolgend anhand der Figuren erläutert, wobei die Figuren bevorzugte Ausführungsformen der Erfindung zeigen. Es zeigen schematisch

Figur 1:
eine Längsschnittansicht durch einen Speiserkorpus mit einer Hülle und
Figur 2:
eine Draufsicht auf den Speiserkorpus mit Hülle gemäß Figur 1.
The invention and the technical environment are explained below with reference to the figures, the figures showing preferred embodiments of the invention. It show schematically
Figure 1:
a longitudinal sectional view through a feeder body with a shell and
Figure 2:
a plan view of the feeder body with casing according to Figure 1 .

In den Figuren ist ein Speiserkorpus 1 dargestellt, der eine umlaufende Seitenwand 2 aufweist, die sich von einem Bodenbereich 11 entlang einer Längsachse 7 zu einem Deckelbereich 12 erstreckt. Die Seitenwand 2 begrenzt mit einer Innenkontur 14 einen Speiserhohlraum 4. An den Speiserhohlraum 4 schließt sich eine Speiseröffnung 5 an, über die der Speiserhohlraum 4 während des Gießvorganges mit dem Formhohlraum der Gießform verbunden ist.The figures show a feeder body 1 which has a circumferential side wall 2 which extends from a base area 11 along a longitudinal axis 7 to a cover area 12. The side wall 2 delimits a feeder cavity 4 with an inner contour 14. A feeder opening 5 adjoins the feeder cavity 4, via which the feeder cavity 4 is connected to the mold cavity of the casting mold during the casting process.

Die Seitenwand 2 weist auf ihrer Außenseite eine Außenkontur 3 mit einer Vielzahl von sich entlang der Längsachse 7 erstreckenden Außenkonturvorsprüngen 6 auf, die in Umfangsrichtung des Speiserkorpus 1 hintereinander angeordnet sind und sich ausgehend von dem Bodenbereich 13 über etwa drei Viertel der Länge des Speiserkorpus 1 erstrecken. Der Speiserkorpus 1 weist somit im unteren Bereich eine lamellenförmige Außenkontur auf.The side wall 2 has on its outside an outer contour 3 with a plurality of outer contour projections 6 extending along the longitudinal axis 7, which are arranged one behind the other in the circumferential direction of the feeder body 1 and, starting from the bottom area 13, extend over approximately three quarters of the length of the feeder body 1 . The feeder body 1 thus has a lamellar outer contour in the lower area.

Wie insbesondere aus Figur 2 hervorgeht, weisen die Außenkonturvorsprünge 6 eine Breite 8 auf, die entlang der Längsachse 7 von dem Bodenbereich 11 zum Deckelbereich 12 zunimmt, so dass die Breite eines Hohlraumes 10 zwischen zwei benachbarten Außenkonturvorsprüngen 6 abnimmt.Like in particular from Figure 2 As can be seen, the outer contour projections 6 have a width 8 which increases along the longitudinal axis 7 from the base area 11 to the cover area 12, so that the width of a cavity 10 between two adjacent outer contour projections 6 decreases.

Es ist zu erkennen, dass sich die Querschnittsgestaltung der Innenkontur 14, ausgehend von dem die Speiseröffnung 5 aufweisenden Bodenbereich 11 entlang der Längsachse 7 hin zum Deckelbereich 12 verjüngt. Es ist somit möglich, den Speiserkorpus 1 in einem einzigen Prozessschritt ohne verlorenen Kern in einem Kernkasten herzustellen.It can be seen that the cross-sectional configuration of the inner contour 14, starting from the bottom area 11 having the feeder opening 5, extends the longitudinal axis 7 tapers towards the cover area 12. It is thus possible to manufacture the feeder body 1 in a single process step without a lost core in a core box.

Der in den Figuren dargestellte Speisereinsatz weist zusätzlich zu dem Speiserkorpus 1 eine Hülle 9 auf, die den unteren Bereich des Speiserkorpus 1 im Bereich der Außenkonturvorsprünge 6 in Umfangsrichtung umgibt. Die Innenseite der Hülle 9 liegt dabei im Bereich der Seitenwand 2 an den Außenseiten der Außenkonturvorsprünge 6 an. Die Hülle 9 überdeckt zudem den Bodenbereich 11 des Speiserkorpus 1, wobei eine Öffnung 13 der Hülle 9 kleiner ist als die Speiseröffnung 5.The feeder insert shown in the figures has, in addition to the feeder body 1, a sleeve 9 which surrounds the lower area of the feeder body 1 in the area of the outer contour projections 6 in the circumferential direction. The inside of the casing 9 lies against the outside of the outer contour projections 6 in the area of the side wall 2. The casing 9 also covers the bottom area 11 of the feeder body 1, an opening 13 of the casing 9 being smaller than the feeder opening 5.

Die Hülle 9 verhindert, dass während des Formvorganges Formstoff zwischen die Außenkonturvorsprünge 6 gelangt, so dass mit Luft gefüllte Hohlräume 10 ausgebildet werden, die von benachbarten Außenkonturvorsprüngen 6 und der Hülle 9 sowie an ihren oberen Enden vom Speiserkorpus 1 selbst begrenzt sind. Diese Hohlräume 10 sorgen für eine Isolierung während des Gießvorganges.The sleeve 9 prevents molding material from getting between the outer contour projections 6 during the molding process, so that air-filled cavities 10 are formed which are delimited by adjacent outer contour projections 6 and the sleeve 9 and at their upper ends by the feeder body 1 itself. These cavities 10 provide insulation during the casting process.

BezugszeichenlisteList of reference symbols

11
SpeiserkorpusFeeder body
22
SeitenwandSide wall
33
AußenkonturOuter contour
44th
SpeiserhohlraumFeeder cavity
55
SpeiseröffnungFeeder opening
66th
AußenkonturvorsprungOuter contour protrusion
77th
LängsachseLongitudinal axis
88th
Breitewidth
99
HülleShell
1010
Hohlraumcavity
1111
BodenbereichFloor area
1212th
DeckelbereichLid area
1313
Öffnungopening
1414th
InnenkonturInner contour

Claims (10)

Speisereinsatz zum Einsetzen in eine beim Gießen von Metallen verwendete Gießform, umfassend einen aus einem isolierenden und/oder exothermen Speisermaterial bestehenden Speiserkorpus (1), aufweisend - eine umlaufende Seitenwand (2), wobei die Seitenwand (2) eine nach außen gerichtete Außenkontur (3) aufweist, - einen zumindest von der Seitenwand (2) begrenzten Speiserhohlraum (4) zur Aufnahme von flüssigem Metall und - eine Speiseröffnung (5) zum Verbinden des Speiserhohlraums (4) mit einem Formhohlraum der Gießform während des Gießvorganges, dadurch gekennzeichnet, dass der Speisereinsatz zusätzlich zu dem Speiserkorpus (1) eine Hülle (9) umfasst, wobei die Hülle (9) die Außenkontur (3) zumindest abschnittsweise umgibt und zwischen der Hülle (9) und der Außenkontur (3) mindestens ein Hohlraum (10) ausgebildet ist.A feeder insert for insertion into a casting mold used in the casting of metals, comprising a feeder body (1) consisting of an insulating and / or exothermic feeder material - A circumferential side wall (2), the side wall (2) having an outwardly directed outer contour (3), - One at least by the side wall (2) delimited feeder cavity (4) for receiving liquid metal and - A feeder opening (5) for connecting the feeder cavity (4) to a mold cavity of the casting mold during the casting process, characterized in that the feeder insert comprises a casing (9) in addition to the feeder body (1), the casing (9) at least partially surrounding the outer contour (3) and at least one cavity (10) being formed between the casing (9) and the outer contour (3) is. Speisereinsatz nach Anspruch 1, wobei die Hülle (9) aus einem formstabilen Körper wie metallischem Blech gebildet ist.Feeder insert according to Claim 1, the casing (9) being formed from a dimensionally stable body such as sheet metal. Speisereinsatz nach Anspruch 1 oder 2, wobei eine Vielzahl von Abstandshaltern vorgesehen sind, wobei die Abstandshalter einer radialen Verformung der Hülle entgegenwirken.Feeder insert according to claim 1 or 2, wherein a plurality of spacers are provided, the spacers counteracting a radial deformation of the casing. Speisereinsatz nach Anspruch 3, wobei die Abstandshalter einteilig mit der Hülle oder mit dem Speiserkorpus ausgebildet sind.Feeder insert according to claim 3, wherein the spacers are formed in one piece with the casing or with the feeder body. Speisereinsatz nach einem der vorhergehenden Ansprüche, wobei die Hülle (9) sich über einen die Speiseröffnung (5) aufweisenden Bodenbereich (11) des Speiserkorpus (1) erstreckt und eine der Speiseröffnung (5) des Speiserkorpus (1) zugeordnete Öffnung (13) aufweist, wobei die Öffnung (13) der Hülle (9) kleiner ist als die Speiseröffnung (5).Feeder insert according to one of the preceding claims, wherein the casing (9) extends over a bottom area (11) of the feeder body (1) having the feeder opening (5) and has an opening (13) assigned to the feeder opening (5) of the feeder body (1) , wherein the opening (13) of the casing (9) is smaller than the feeder opening (5). Speisereinsatz nach einem der vorhergehenden Ansprüche, wobei die Außenkontur (3) eine Vielzahl von Außenkonturvorsprüngen (6) und/oder Außenkonturrücksprüngen aufweist.Feeder insert according to one of the preceding claims, wherein the outer contour (3) has a plurality of outer contour projections (6) and / or outer contour recesses. Speisereinsatz nach Anspruch 6, wobei sich zumindest einige Außenkonturvorsprünge (6) und/oder Außenkonturrücksprünge jeweils entlang einer durch die Speiseröffnung (5) definierten Längsachse des Speiserkorpus (1) erstrecken.Feeder insert according to Claim 6, at least some external contour projections (6) and / or external contour recesses each extending along a longitudinal axis of the feeder body (1) defined by the feeder opening (5). Speisereinsatz nach einem der vorhergehenden Ansprüche 6 bis 7, wobei sich eine Breite der Außenkonturvorsprünge (6) und/oder der Außenkonturrücksprünge entlang ihrer Länge ändert.Feeder insert according to one of the preceding claims 6 to 7, wherein a width of the outer contour projections (6) and / or the outer contour recesses changes along their length. Speisereinsatz nach einem der vorhergehenden Ansprüche, wobei sich eine Querschnittsgestaltung einer Innenkontur (14) ausgehend von der Speiseröffnung (5) entlang der Längsachse (7) verjüngt.Feeder insert according to one of the preceding claims, wherein a cross-sectional configuration of an inner contour (14) tapers starting from the feeder opening (5) along the longitudinal axis (7). Speisereinsatz nach einem der vorhergehenden Ansprüche, wobei der Speiserkorpus (1) einteilig ausgebildet ist.Feeder insert according to one of the preceding claims, wherein the feeder body (1) is constructed in one piece.
EP19182035.6A 2019-06-24 2019-06-24 Feeder insert with sleeve Active EP3756787B1 (en)

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EP19182035.6A EP3756787B1 (en) 2019-06-24 2019-06-24 Feeder insert with sleeve

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113369442A (en) * 2021-05-25 2021-09-10 庆铃汽车（集团）有限公司 Injection riser and riser device for improving internal defects of castings
CN114535510A (en) * 2022-02-28 2022-05-27 无锡市蠡湖铸业有限公司 Feeder head of volute casing casting and machining method of volute casing casting

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EP0779844A1 (en) 1995-06-28 1997-06-25 Chemex Gmbh Feeder for use in casting molten metal
EP0888199A1 (en) 1996-03-25 1999-01-07 Ashland Inc. Sleeves, their preparation, and use
US20010026036A1 (en) * 1999-12-06 2001-10-04 Midea Anthony C. Refractory article for molten metal handling
DE10156571C1 (en) * 2001-11-20 2003-01-16 Gtp Schaefer Giestechnische Pr Feeder, used for inserting into a casting mold for casting metals, comprises a hat-like cap enclosing the outer wall of a feeder body forming an insulating gap and fixed against the body
EP1864729A2 (en) 2006-06-08 2007-12-12 GTP-Schäfer Giesstechnische Produkte GmbH Metal feeder
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
EP2489449A1 (en) 2011-02-18 2012-08-22 GTP-Schäfer Giesstechnische Produkte GmbH Feeder with exothermic feeder body and external insulation jacket
JP2013215799A (en) * 2012-04-11 2013-10-24 Foundry Tech Consulting:Kk Structure of feeder head
EP3009209A1 (en) 2014-10-16 2016-04-20 GTP-Schäfer Giesstechnische Produkte GmbH Process for manufacturing a riser with cavities in its wall

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779844A1 (en) 1995-06-28 1997-06-25 Chemex Gmbh Feeder for use in casting molten metal
EP0888199A1 (en) 1996-03-25 1999-01-07 Ashland Inc. Sleeves, their preparation, and use
US20010026036A1 (en) * 1999-12-06 2001-10-04 Midea Anthony C. Refractory article for molten metal handling
DE10156571C1 (en) * 2001-11-20 2003-01-16 Gtp Schaefer Giestechnische Pr Feeder, used for inserting into a casting mold for casting metals, comprises a hat-like cap enclosing the outer wall of a feeder body forming an insulating gap and fixed against the body
EP1864729A2 (en) 2006-06-08 2007-12-12 GTP-Schäfer Giesstechnische Produkte GmbH Metal feeder
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
EP2489449A1 (en) 2011-02-18 2012-08-22 GTP-Schäfer Giesstechnische Produkte GmbH Feeder with exothermic feeder body and external insulation jacket
JP2013215799A (en) * 2012-04-11 2013-10-24 Foundry Tech Consulting:Kk Structure of feeder head
EP3009209A1 (en) 2014-10-16 2016-04-20 GTP-Schäfer Giesstechnische Produkte GmbH Process for manufacturing a riser with cavities in its wall

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113369442A (en) * 2021-05-25 2021-09-10 庆铃汽车（集团）有限公司 Injection riser and riser device for improving internal defects of castings
CN114535510A (en) * 2022-02-28 2022-05-27 无锡市蠡湖铸业有限公司 Feeder head of volute casing casting and machining method of volute casing casting

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