EP2734322B1 - Casting core of a casting mould for producing a cylinder - Google Patents

Casting core of a casting mould for producing a cylinder Download PDF

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Publication number
EP2734322B1
EP2734322B1 EP12731009.2A EP12731009A EP2734322B1 EP 2734322 B1 EP2734322 B1 EP 2734322B1 EP 12731009 A EP12731009 A EP 12731009A EP 2734322 B1 EP2734322 B1 EP 2734322B1
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Prior art keywords
core
casting
cylinder
sand
steel
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EP12731009.2A
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German (de)
French (fr)
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EP2734322A1 (en
Inventor
Günther MAYER
Thorsten EIL
Jürgen Schwarz
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Mahle International GmbH
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Mahle International GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/103—Multipart cores

Definitions

  • the present invention relates to a casting core for a casting mold for producing a cylinder of an internal combustion engine according to the preamble of claim 1.
  • the invention also relates to a method for producing a cast cylinder.
  • a generic casting core for casting cast iron cylinders of air cooled internal combustion engines.
  • a core is provided from a compact metal cooling bush provided with bores, which is provided on all sides with a sand cladding.
  • the JP 60 040663 A discloses a casting core of a casting mold for producing a cylinder of an internal combustion engine.
  • the casting core comprises a radially outwardly projecting part and is formed in two parts.
  • the US 4,252,175 discloses the formation of a two-part casting core with a sand core and a steel core.
  • the JP 1 309774 A treats a two-part casting core of sand and a metal bush.
  • the US 4,003,422 discloses a one-piece casting core which may be formed of sand.
  • a socket is formed of metal and thus represents a steel core.
  • the present invention is concerned with the problem of providing for a casting core of the generic type an improved or at least one alternative embodiment, which is characterized in particular by an improved thermal management.
  • the present invention is based on the general idea of forming a casting core of a mold for producing a cylinder of an internal combustion engine, in particular for producing an aluminum cylinder of a two-stroke engine, not one piece of sand as before, but according to the invention of two parts, namely a sand core and a associated steel core.
  • a sand core preferably only the upper part of G mankerns, that is, that region which is later assigned to a combustion chamber of the cylinder, formed of sand, whereas a lower region, that is, the region which is assigned to a later cylinder surface, is formed of steel.
  • the steel core takes in comparison to the sand core significantly more heat and performs this comparatively, making it especially in the cylinder surface to a significantly increased temperature difference between the cylinder surface (surface) and further inside and thereby voids can be avoided or at least reduced , Since such voids are extremely critical, particularly in the area of the later cylinder running surfaces, the steel core is used in this area in particular in order to achieve as rapid / uniform cooling of the cast cylinder as possible, together with the outermost mold and also made of metal. Due to the core made of steel now as rapid cooling in the cylinder running surface inwards as outward to the steel mold, whereby the possibly forming voids are forced into the interior of the cylinder wall and indeed so deep that they no longer at a later processing be opened.
  • the casting core is furthermore formed by a sand core, as a result of which, in particular, difficult casting geometries, in particular also undercuts, can be produced.
  • the essential advantage of the casting core according to the invention is that the voids formation is at least greatly reduced or preferably completely avoided and even when voids appear they are arranged so deeply in the cylinder wall that they can be rotated or honed during a later processing step. can not be opened and thereby adversely affect the cylinder running properties.
  • the sand core engages via a mandrel in a corresponding recess on the steel core.
  • the sand core is preferably positively connected to the steel core, whereby the handling of the From the sand core and the steel core formed G thinkkerns is significantly simplified.
  • the sand core and / or the steel core are each solid. Due to the massive formation of the sand core and / or the steel core, these are relatively robust and therefore ideally suited for use in modern foundries. At the same time allows a massive training, especially the steel core, and a significantly improved heat absorption and thus a significantly improved heat dissipation, whereby a uniform solidification or cooling of the cylinder can be achieved.
  • An inventive casting core 1 of a casting mold not shown otherwise for the production of a likewise not shown cylinder of an internal combustion engine, in particular for producing a cylinder of a two-stroke engine, a sand core 2 and a steel core 3 connected thereto.
  • the casting core 1 is formed in two parts, wherein the sand core 2 at least partially covers an area of a later combustion chamber of the cylinder, whereas the steel core 3 at least partially covers an area of a later cylinder running surface.
  • the occurrence of blowholes is extremely critical, as this can negatively affect the piston running properties. It is therefore essential to avoid such voids.
  • voids are formed in particular by the fact that the cast cylinder solidifies unevenly and with large temperature differences, which was especially the use of hitherto customary and made entirely of sand casting cores on the agenda.
  • sand core 1 of the invention can provide a remedy by being formed in the region of a later cylinder surface of the steel core 3, thereby enabling a comparatively high heat dissipation.
  • the high heat dissipation in particular in the region of the later cylinder running surface causes a small temperature difference of the cooling cylinder between the inner steel core 3 and the outer, not shown mold.
  • the mold forms an outer shape of the casting mold, whereas the casting core 1 represents the inner shape of the casting mold.
  • the steel core 3 urges the forming voids so deeply into the interior of the steel core 3 by a high cooling rate Cylinder wall, that they are not opened even in a later processing.
  • the sand core 2 has a mandrel 4, which engages in a corresponding recess 5 on the steel core 3.
  • a mandrel 4 on the steel core 3 and the corresponding formation of the recess 5 on the sand core 2 is conceivable.
  • a positive connection between the sand core 2 and the steel core 3 can be achieved.
  • / the sand core 2 and / or the steel core 3 are solid, which in particular in the region of the steel core 3, a high and a rapid heat dissipation can be done.
  • Steel has a significantly improved thermal conductivity compared to sand.
  • 3 openings 6 may be provided in the steel core, via which, for example, a vent or cooling can take place.
  • the casting core 1 according to the invention is used for the production of cast cylinders and in this process is surrounded by a mold, not shown.
  • the casting core constitutes the casting mold together with the mold.
  • the material used for casting the cylinder may, for example, be cast steel but also light metal, such as, for example, aluminum.
  • the casting core 1 With the casting core 1 according to the invention, a uniform cooling of the cast cylinder from inside and outside and, associated therewith, a significantly reduced voids formation in the region of the critical regions can be achieved, as a result of which the quality of the cylinders produced in this way can be significantly increased. If, contrary to expectations, cavities or inclusions nevertheless form, they are usually arranged so deeply in the cylinder that they are not exposed during a later processing step, for example when grinding, turning or honing, and are therefore harmless.

Description

Die vorliegende Erfindung betrifft einen Gießkern für eine Gussform zur Herstellung eines Zylinders einer Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1. Die Erfindung betrifft außerdem ein Verfahren zur Herstellung eines gegossenen Zylinders.The present invention relates to a casting core for a casting mold for producing a cylinder of an internal combustion engine according to the preamble of claim 1. The invention also relates to a method for producing a cast cylinder.

Aus der DE 35 09 015 A1 ist ein gattungsgemäßer Gießkern zum Gießen von aus Grauguss bestehenden Zylindern von Luft gekühlten Verbrennungsmotoren bekannt. Um dabei insbesondere ein hinsichtlich einer unerwünschten Lunkerbildung ungünstiges Abkühlverhalten optimieren zu können, wird ein Kern vorgesehen aus einer mit Bohrungen versehenen kompakten Metallkühlbüchse, die allseitig mit einer Sandverkleidung versehen ist. Mit diesem Gießkern mit intensiver Wärmeabfuhr wird bei der Erstarrung der in der Gussform befindlichen Graugussschmelze eine gezielte Formierung einer Gasdichte perlitischer Struktur der Zylinderwand, besonders der Fläche der Zylinderbohrung und einer die Wärmeleitung fördernden grauen Struktur in den Kühlrippen ermöglicht, wodurch hohe Qualitätsansprüche an die damit hergestellten Zylinder erfüllt werden sollen.From the DE 35 09 015 A1 For example, a generic casting core is known for casting cast iron cylinders of air cooled internal combustion engines. In order to be able to optimize in particular a cooling behavior unfavorable with regard to undesired voids formation, a core is provided from a compact metal cooling bush provided with bores, which is provided on all sides with a sand cladding. With this casting core with intensive heat dissipation, a specific formation of a gas-tight perlitic structure of the cylinder wall, especially the surface of the cylinder bore and a heat conduction promoting gray structure in the cooling fins is made possible during solidification of the cast iron in the casting mold, whereby high quality demands on the thus produced Cylinder should be met.

Generell besteht bei bekannten Gießverfahren zum Herstellen von gegossenen Zylindern für Brennkraftmaschinen das Problem, dass bei Verwendung eines Sandkernes eine ungleichmäßige Abkühlung des gegossenen Zylinders stattfindet, wodurch hohe Temperaturdifferenzen innerhalb des Zylinders auftreten. Diese vergleichsweise hohen Temperaturdifferenzen können zu einer Lunkerbildung, insbesondere auf einer späteren Zylinderlaufbahn, führen, was unbedingt zu vermeiden ist.In general, in known casting methods for producing cast cylinders for internal combustion engines, there is the problem that when using a sand core uneven cooling of the cast cylinder takes place, whereby high temperature differences occur within the cylinder. These comparatively high temperature differences can lead to a voids formation, in particular on a later cylinder track, which is absolutely to be avoided.

Die JP 60 040663 A offenbart einen Gießkern einer Gussform zur Herstellung eines Zylinders einer Brennkraftmaschine. Der Gießkern umfasst ein radial nach außen vorstehendes Teil und ist zweiteilig ausgebildet.The JP 60 040663 A discloses a casting core of a casting mold for producing a cylinder of an internal combustion engine. The casting core comprises a radially outwardly projecting part and is formed in two parts.

Die US 4,252,175 offenbart die Ausbildung eines zweiteiligen Gießkerns mit einem Sandkern und einem Stahlkern.The US 4,252,175 discloses the formation of a two-part casting core with a sand core and a steel core.

Die JP 1 309774 A behandelt einen zweiteiligen Gießkern aus Sand und mit einer Buchse aus Metall.The JP 1 309774 A treats a two-part casting core of sand and a metal bush.

Die US 4,003,422 offenbart einen einteiligen Gießkern, der aus Sand ausgebildet sein kann. Eine Buchse ist aus Metall ausgebildet und stellt somit einen Stahlkern dar.The US 4,003,422 discloses a one-piece casting core which may be formed of sand. A socket is formed of metal and thus represents a steel core.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, für einen Gießkern der gattungsgemäßen Art eine verbesserte oder zumindest eine alternative Ausführungsform anzugeben, die sich insbesondere durch ein verbessertes Wärmemanagement auszeichnet.The present invention is concerned with the problem of providing for a casting core of the generic type an improved or at least one alternative embodiment, which is characterized in particular by an improved thermal management.

Dieses Problem wird erfindungsgemäß durch die Gegenstände der unabhängigen Ansprüche gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This problem is solved according to the invention by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.

Die vorliegende Erfindung beruht auf dem allgemeinen Gedanken, einen Gießkern einer Gussform zur Herstellung eines Zylinders einer Brennkraftmaschine, insbesondere zur Herstellung eines Aluminium-Zylinders eines Zweitaktmotors, nicht wie bisher einteilig aus Sand auszubilden, sondern erfindungsgemäß aus zwei Teilen, nämlich aus einem Sandkern und einem damit verbundenen Stahlkern. Hierbei wird vorzugsweise lediglich der obere Teil des Gießkerns, also derjenige Bereich, der später einem Brennraum des Zylinders zugeordnet ist, aus Sand ausgebildet, wogegen ein unterer Bereich, also derjenige Bereich, der einer späteren Zylinderlauffläche zugeordnet ist, aus Stahl ausgebildet wird. Der Stahlkern nimmt dabei im Vergleich zum Sandkern deutlich mehr Wärme auf und führt diese vergleichsweise ab, wodurch es insbesondere im Bereich der Zylinderlauffläche zu einer deutlich erhöhten Temperaturdifferenz zwischen der Zylinderlauffläche (Oberfläche) und weiter innen kommt und dadurch Lunker vermieden bzw. zumindest reduziert werden können. Da derartige Lunker insbesondere im Bereich der späteren Zylinderlaufflächen äußerst kritisch sind, wird in besonders diesem Bereich der Stahlkern eingesetzt, um zusammen mit der außenliegenden und ebenfalls aus Metall ausgebildeten Kokille eine möglichst rasche/gleichmäßige Abkühlung des gegossenen Zylinders zu erreichen. Durch den aus Stahl ausgebildeten Kern erfolgt nun im Bereich der Zylinderlauffläche eine ebenso rasche Abkühlung nach innen wie nach außen zur Stahlkokille, wodurch die sich unter Umständen bildenden Lunker ins Innere der Zylinderwand gedrängt werden und zwar so tief, dass diese bei einer späteren Bearbeitung nicht mehr geöffnet werden. Im Bereich des späteren Brennraums hingegen ist der Gießkern weiterhin durch einen Sandkern gebildet, wodurch insbesondere schwierige Gießgeometrien, insbesondere auch Hinterschnitte, herstellbar sind. Der wesentliche Vorteil des erfindungsgemäßen Gießkerns liegt darin, dass die Lunkerbildung zumindest stark reduziert oder vorzugweise gänzlich vermieden wird und selbst beim Auftreten von Lunkern diese so tief in der Zylinderwand angeordnet sind, dass sie bei einem späteren Bearbeitungsschritt, bspw. bei einem Drehen oder Honen, nicht geöffnet werden und dadurch die Zylinderlaufeigenschaften nicht negativ beeinträchtigen. Erfindungsgemäß greift der Sandkern über einen Dorn in eine entsprechende Ausnehmung am Stahlkern ein. Der Sandkern ist dabei vorzugsweise formschlüssig mit dem Stahlkern verbunden, wodurch die Handhabbarkeit des aus dem Sandkern und dem Stahlkern gebildeten Gießkerns deutlich vereinfacht wird.The present invention is based on the general idea of forming a casting core of a mold for producing a cylinder of an internal combustion engine, in particular for producing an aluminum cylinder of a two-stroke engine, not one piece of sand as before, but according to the invention of two parts, namely a sand core and a associated steel core. In this case, preferably only the upper part of Gießkerns, that is, that region which is later assigned to a combustion chamber of the cylinder, formed of sand, whereas a lower region, that is, the region which is assigned to a later cylinder surface, is formed of steel. The steel core takes in comparison to the sand core significantly more heat and performs this comparatively, making it especially in the cylinder surface to a significantly increased temperature difference between the cylinder surface (surface) and further inside and thereby voids can be avoided or at least reduced , Since such voids are extremely critical, particularly in the area of the later cylinder running surfaces, the steel core is used in this area in particular in order to achieve as rapid / uniform cooling of the cast cylinder as possible, together with the outermost mold and also made of metal. Due to the core made of steel now as rapid cooling in the cylinder running surface inwards as outward to the steel mold, whereby the possibly forming voids are forced into the interior of the cylinder wall and indeed so deep that they no longer at a later processing be opened. In the region of the later combustion chamber, by contrast, the casting core is furthermore formed by a sand core, as a result of which, in particular, difficult casting geometries, in particular also undercuts, can be produced. The essential advantage of the casting core according to the invention is that the voids formation is at least greatly reduced or preferably completely avoided and even when voids appear they are arranged so deeply in the cylinder wall that they can be rotated or honed during a later processing step. can not be opened and thereby adversely affect the cylinder running properties. According to the invention, the sand core engages via a mandrel in a corresponding recess on the steel core. The sand core is preferably positively connected to the steel core, whereby the handling of the From the sand core and the steel core formed Gießkerns is significantly simplified.

Bei einer vorteilhaften Weiterbildung der erfindungsgemäßen Lösung sind/ist der Sandkern und/oder der Stahlkern jeweils massiv ausgebildet. Durch die massive Ausbildung des Sandkerns und/oder des Stahlkerns sind diese vergleichsweise robust und dadurch bestens geeignet für den Einsatz in modernen Gießereien. Zugleich ermöglicht eine massive Ausbildung, insbesondere des Stahlkerns, auch eine deutlich verbesserte Wärmeaufnahme und damit eine deutlich verbesserte Wärmeabfuhr, wodurch ein gleichmäßiges Erstarren bzw. Erkalten des Zylinders erreicht werden kann.In an advantageous development of the solution according to the invention, the sand core and / or the steel core are each solid. Due to the massive formation of the sand core and / or the steel core, these are relatively robust and therefore ideally suited for use in modern foundries. At the same time allows a massive training, especially the steel core, and a significantly improved heat absorption and thus a significantly improved heat dissipation, whereby a uniform solidification or cooling of the cylinder can be achieved.

Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen.Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Dabei zeigen, jeweils schematisch,

Fig. 1
einen erfindungsgemäßen Gießkern in einer Ansicht,
Fig. 2
eine Schnittdarstellung durch den erfindungsgemäßen Gießkern entlang der Schnittebene A-A.
Show, in each case schematically,
Fig. 1
a casting core according to the invention in a view,
Fig. 2
a sectional view through the casting core according to the invention along the sectional plane AA.

Entsprechend den Fig. 1 und 2, weist ein erfindungsgemäßer Gießkern 1 einer im übrigen nicht dargestellten Gussform zur Herstellung eines ebenfalls nicht dargestellten Zylinders einer Brennkraftmaschine, insbesondere zur Herstellung eines Zylinders eines Zweitaktmotors, einen Sandkern 2 sowie einen damit verbundenen Stahlkern 3 auf. Demzufolge ist der Gießkern 1 zweiteilig ausgebildet, wobei der Sandkern 2 einen Bereich eines späteren Brennraums des Zylinders zumindest teilweise abdeckt, wogegen der Stahlkern 3 einen Bereich einer späteren Zylinderlauffläche zumindest teilweise abdeckt. Insbesondere im Bereich der späteren Zylinderlauffläche ist das Auftreten von Lunkern äußerst kritisch, da dadurch die Kolbenlaufeigenschaften negativ beeinträchtigt werden können. Es gilt demzufolge derartige Lunker unbedingt zu vermeiden. Solche Lunker entstehen insbesondere dadurch, dass der gegossene Zylinder ungleichmäßig und mit großen Temperaturdifferenzen erstarrt, was insbesondere bei der Verwendung von bisher üblichen und ganz aus Sand ausgebildeten Gießkernen an der Tagesordnung war. Hier kann der erfindungsgemäße Sandkern 1 Abhilfe schaffen, indem er im Bereich einer späteren Zylinderlauffläche aus dem Stahlkern 3 gebildet ist und dadurch eine vergleichsweise hohe Wärmeabfuhr ermöglicht. Die hohe Wärmeabfuhr insbesondere im Bereich der späteren Zylinderlauffläche bewirkt eine geringe Temperaturdifferenz des erkaltenden Zylinders zwischen dem innenliegenden Stahlkern 3 und der außenliegenden, nicht gezeigten Kokille. Die Kokille bildet dabei eine Außenform der Gussform, wogegen der Gießkern 1 die Innenform der Gussform darstellt. Gleichzeit drängt der Stahlkern 3 durch eine hohe Abkühlgeschwindigkeit die sich bildenden Lunker so tief ins Innere der Zylinderwand, dass sie auch bei einer späteren Bearbeitung nicht mehr geöffnet werden.According to the Fig. 1 and 2 , An inventive casting core 1 of a casting mold, not shown otherwise for the production of a likewise not shown cylinder of an internal combustion engine, in particular for producing a cylinder of a two-stroke engine, a sand core 2 and a steel core 3 connected thereto. Accordingly, the casting core 1 is formed in two parts, wherein the sand core 2 at least partially covers an area of a later combustion chamber of the cylinder, whereas the steel core 3 at least partially covers an area of a later cylinder running surface. Particularly in the area of the later cylinder surface, the occurrence of blowholes is extremely critical, as this can negatively affect the piston running properties. It is therefore essential to avoid such voids. Such voids are formed in particular by the fact that the cast cylinder solidifies unevenly and with large temperature differences, which was especially the use of hitherto customary and made entirely of sand casting cores on the agenda. Here sand core 1 of the invention can provide a remedy by being formed in the region of a later cylinder surface of the steel core 3, thereby enabling a comparatively high heat dissipation. The high heat dissipation, in particular in the region of the later cylinder running surface causes a small temperature difference of the cooling cylinder between the inner steel core 3 and the outer, not shown mold. The mold forms an outer shape of the casting mold, whereas the casting core 1 represents the inner shape of the casting mold. At the same time, the steel core 3 urges the forming voids so deeply into the interior of the steel core 3 by a high cooling rate Cylinder wall, that they are not opened even in a later processing.

Durch die Ausbildung des Gießkerns 1 im Bereich des späteren Brennraums des Zylinders aus Sand bzw. aus dem erfindungsgemäßen Sandkern 2 ist es möglich, selbst komplizierte Geometrien in diesem Bereich, insbesondere auch Hinterschnitten, gießen zu können.As a result of the formation of the casting core 1 in the region of the later combustion chamber of the cylinder made of sand or of the sand core 2 according to the invention, it is possible to cast even complicated geometries in this region, in particular also undercuts.

Betrachtet man die Fig. 2, so kann man erkennen, dass der Sandkern 2 einen Dorn 4 aufweist, der in eine entsprechende Ausnehmung 5 am Stahlkern 3 eingreift. Selbstverständlich ist auch die Ausbildung eines derartigen Dorns 4 am Stahlkern 3 und die entsprechende Ausbildung der Ausnehmung 5 am Sandkern 2 denkbar. Über den Dorn 4 und die zugehörige Ausnehmung 5 kann eine formschlüssige Verbindung zwischen dem Sandkern 2 und dem Stahlkern 3 erreicht werden.Looking at the Fig. 2 , it can be seen that the sand core 2 has a mandrel 4, which engages in a corresponding recess 5 on the steel core 3. Of course, the formation of such a mandrel 4 on the steel core 3 and the corresponding formation of the recess 5 on the sand core 2 is conceivable. About the mandrel 4 and the associated recess 5, a positive connection between the sand core 2 and the steel core 3 can be achieved.

Wie der Fig. 2 weiter zu entnehmen ist, sind/ist der Sandkern 2 und/oder der Stahlkern 3 massiv ausgebildet, wodurch insbesondere im Bereich des Stahlkerns 3 eine hohe und eine rasche Wärmeabfuhr erfolgen kann. Stahl besitzt dabei gegenüber Sand eine deutlich verbesserte Wärmeleitfähigkeit. Zusätzlich können im Stahlkern 3 Öffnungen 6 vorgesehen sein, über welche bspw. eine Entlüftung oder Kühlen erfolgen kann.Again Fig. 2 can be seen further, / the sand core 2 and / or the steel core 3 are solid, which in particular in the region of the steel core 3, a high and a rapid heat dissipation can be done. Steel has a significantly improved thermal conductivity compared to sand. In addition, 3 openings 6 may be provided in the steel core, via which, for example, a vent or cooling can take place.

Der erfindungsgemäße Gießkern 1 wird zum Herstellen von gegossenen Zylindern benutzt und bei diesem Verfahren von einer nicht gezeigten Kokille umgeben. Zusammen mit der Kokille stellt der Gießkern die Gussform dar. Das zum Gießen des Zylinders verwendete Material kann bspw. Stahlguss aber auch Leichtmetall, wie bspw. Aluminium sein.The casting core 1 according to the invention is used for the production of cast cylinders and in this process is surrounded by a mold, not shown. The casting core constitutes the casting mold together with the mold. The material used for casting the cylinder may, for example, be cast steel but also light metal, such as, for example, aluminum.

Mit dem erfindungsgemäßen Gießkern 1 sind eine gleichmäßige Abkühlung des gegossenen Zylinders von innen und außen und damit verbunden eine deutlich reduzierte Lunkerbildung im Bereich der kritischen Bereiche zu erreichen, wodurch die Qualität der so hergestellten Zylinder deutlich gesteigert werden kann. Bilden sich wider Erwarten trotzdem Lunker bzw. Einschlüsse, so sind diese üblicherweise so tief im Zylinder angeordnet, dass sie bei einem späteren Bearbeitungsschritt, bspw. bei einem Schleifen, Drehen oder Honen, nicht offengelegt werden und dadurch unschädlich sind.With the casting core 1 according to the invention, a uniform cooling of the cast cylinder from inside and outside and, associated therewith, a significantly reduced voids formation in the region of the critical regions can be achieved, as a result of which the quality of the cylinders produced in this way can be significantly increased. If, contrary to expectations, cavities or inclusions nevertheless form, they are usually arranged so deeply in the cylinder that they are not exposed during a later processing step, for example when grinding, turning or honing, and are therefore harmless.

Claims (6)

  1. Casting core (1) of a casting mould for producing a cylinder of an internal combustion engine, in particular of a two-stroke engine,
    wherein the casting core (1) is configured in two parts, namely a sand core (2) and a steel core (3) connected thereto,
    characterised in that
    the sand core (3) engages by means of a rod in a corresponding recess (5) on the steel core (2).
  2. Casting core according to claim 1,
    characterised in that
    the sand core (2) at least partially covers a region of the future combustion space of the cylinder, whereas the steel core (3) at least partially covers a region of the future cylinder running surface.
  3. Casting core according to claim 1 or 2,
    characterised in that
    the sand core (2) is connected to the steel core (3) with a form fit.
  4. Casting core according to one of claims 1 to 3,
    characterised in that
    the sand core (2) and/or the steel core (3) are solidly configured.
  5. Method for producing a cast cylinder, in which a shell is used as an outer mould and a casting core (1) according to one of claims 1 to 5 is used as an inner mould.
  6. Method according to claim 5,
    characterised in that
    a metal, in particular aluminium, is cast into the cavity remaining between the outer mould and the inner mould.
EP12731009.2A 2011-07-18 2012-07-04 Casting core of a casting mould for producing a cylinder Active EP2734322B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011079356A DE102011079356A1 (en) 2011-07-18 2011-07-18 Casting core of a casting mold for producing a cylinder
PCT/EP2012/063048 WO2013010798A1 (en) 2011-07-18 2012-07-04 Casting core of a casting mould for producing a cylinder

Publications (2)

Publication Number Publication Date
EP2734322A1 EP2734322A1 (en) 2014-05-28
EP2734322B1 true EP2734322B1 (en) 2017-09-06

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EP12731009.2A Active EP2734322B1 (en) 2011-07-18 2012-07-04 Casting core of a casting mould for producing a cylinder

Country Status (5)

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EP (1) EP2734322B1 (en)
CN (1) CN103648681B (en)
BR (1) BR112014001061A2 (en)
DE (1) DE102011079356A1 (en)
WO (1) WO2013010798A1 (en)

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DE102015225588A1 (en) 2015-12-17 2017-06-22 Volkswagen Aktiengesellschaft Casting and cooling insert for the production of a casting
US11654476B2 (en) 2020-09-28 2023-05-23 GM Global Technology Operations LLC Hybrid core for manufacturing of castings
CN114406201B (en) * 2022-01-26 2023-11-14 阜新力达钢铁铸造有限公司 Casting method and system for guide rail non-porous upright post

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Also Published As

Publication number Publication date
DE102011079356A1 (en) 2013-01-24
CN103648681A (en) 2014-03-19
EP2734322A1 (en) 2014-05-28
BR112014001061A2 (en) 2017-02-21
WO2013010798A1 (en) 2013-01-24
CN103648681B (en) 2016-07-13

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