EP2734322B1 - Noyau de coulée d'un moule pour la fabrication d'un cylindre - Google Patents

Noyau de coulée d'un moule pour la fabrication d'un cylindre 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
Authority
EP
European Patent Office
Prior art keywords
core
casting
cylinder
sand
steel
Prior art date
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.)
Active
Application number
EP12731009.2A
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German (de)
English (en)
Other versions
EP2734322A1 (fr
Inventor
Günther MAYER
Thorsten EIL
Jürgen Schwarz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
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Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2734322A1 publication Critical patent/EP2734322A1/fr
Application granted granted Critical
Publication of EP2734322B1 publication Critical patent/EP2734322B1/fr
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Classifications

    • 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.

Landscapes

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

Claims (6)

  1. Noyau de coulée (1) d'un moule pour la fabrication d'un cylindre d'un moteur à combustion interne, en particulier d'un moteur à deux temps, dans lequel le noyau de coulée (1) est réalisé en deux parties, à savoir un noyau en sable (2) et un noyau en acier (3) assemblé au noyau en sable, caractérisé en ce que le noyau en sable (3) s'engage par l'intermédiaire d'un mandrin dans un évidement correspondant (5) au niveau du noyau en acier (2).
  2. Noyau de coulée selon la revendication 1,
    caractérisé en ce que
    le noyau en sable (2) recouvre au moins partiellement une zone de la future chambre de combustion du cylindre tandis que le noyau en acier (3) recouvre au moins partiellement une zone d'une future surface de glissement de cylindre.
  3. Noyau de coulée selon la revendication 1 ou 2,
    caractérisé en ce que
    le noyau en sable (2) est assemblé au noyau en acier (3) par concordance de forme.
  4. Noyau de coulée selon l'une des revendications 1 à 3,
    caractérisé en ce que
    le noyau en sable (2) et/ou le noyau en acier (3) sont réalisés massifs.
  5. Procédé de fabrication d'un cylindre coulé, dans lequel une coquille est utilisée comme moule extérieur et un noyau de coulée (1) selon l'une des revendications 1 à 5 est utilisé comme moule intérieur.
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    l'espace vide restant entre le moule extérieur et le moule intérieur est rempli par coulée de métal, en particulier d'aluminium.
EP12731009.2A 2011-07-18 2012-07-04 Noyau de coulée d'un moule pour la fabrication d'un cylindre Active EP2734322B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011079356A DE102011079356A1 (de) 2011-07-18 2011-07-18 Gießkern einer Gussform zur Herstellung eines Zylinders
PCT/EP2012/063048 WO2013010798A1 (fr) 2011-07-18 2012-07-04 Noyau de coulée d'un moule pour la fabrication d'un cylindre

Publications (2)

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

Family

ID=46420236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12731009.2A Active EP2734322B1 (fr) 2011-07-18 2012-07-04 Noyau de coulée d'un moule pour la fabrication d'un cylindre

Country Status (5)

Country Link
EP (1) EP2734322B1 (fr)
CN (1) CN103648681B (fr)
BR (1) BR112014001061A2 (fr)
DE (1) DE102011079356A1 (fr)
WO (1) WO2013010798A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015225588A1 (de) 2015-12-17 2017-06-22 Volkswagen Aktiengesellschaft Gießverfahren und Kühleinsatz zur Herstellung eines Gussteiles
US11654476B2 (en) 2020-09-28 2023-05-23 GM Global Technology Operations LLC Hybrid core for manufacturing of castings
CN114406201B (zh) * 2022-01-26 2023-11-14 阜新力达钢铁铸造有限公司 导轨无孔立柱的铸造方法及系统

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DE719454C (de) * 1940-06-30 1942-04-09 Metallgussgesellschaft M B H Verfahren und Vorrichtung zum Festhalten der Kuehleisen in Kern- oder Formkaesten
CH300083A (de) * 1942-11-20 1954-07-15 Daimler Benz Ag Giessform mit Kernen zur Herstellung von Kurbelgehäusen von Brennkraftmaschinen.
GB1465486A (en) * 1973-04-18 1977-02-23 Aeroplane Motor Alu Cast Method and apparatus for forming a curved passage in a casting and a casting so formed
US4003422A (en) * 1975-04-21 1977-01-18 Schramm Buford J Process for making a composite cylinder head assembly
US4252175A (en) * 1979-05-25 1981-02-24 Outboard Marine Corporation Cylinder block having a cast-in core unit and process for manufacturing same
CH640160A5 (de) * 1979-07-05 1983-12-30 Fischer Ag Georg Kokille mit kernzug.
JPS6040663A (ja) * 1983-08-11 1985-03-04 Kawasaki Heavy Ind Ltd シリンダブロツクの製造方法
YU43348B (en) 1984-03-13 1989-06-30 Tam Combined kernel for casting cylinders of grey cast iron for air cooled internal combustion motors
JPH03283Y2 (fr) * 1986-07-24 1991-01-08
US4986942A (en) * 1988-03-22 1991-01-22 Outboard Marine Corporation Method for forming ported cylinder sleeve liner foam pattern
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EP0872295B1 (fr) * 1997-04-15 2002-06-12 Wärtsilä Schweiz AG Moule de coulage et procédé de fabrication de pièces coulées creuses et pièces coulées creuses
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US6478073B1 (en) * 2001-04-12 2002-11-12 Brunswick Corporation Composite core for casting metallic objects
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Also Published As

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

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