EP2091678B1 - Moule de coulée pour la coulée d'une pièce et utilisation de ce moule de coulée - Google Patents

Moule de coulée pour la coulée d'une pièce et utilisation de ce moule de coulée Download PDF

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Publication number
EP2091678B1
EP2091678B1 EP07857208.8A EP07857208A EP2091678B1 EP 2091678 B1 EP2091678 B1 EP 2091678B1 EP 07857208 A EP07857208 A EP 07857208A EP 2091678 B1 EP2091678 B1 EP 2091678B1
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EP
European Patent Office
Prior art keywords
casting
mould
mold
core
chill
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
EP07857208.8A
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German (de)
English (en)
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EP2091678A1 (fr
Inventor
Detlef Kube
Marcus Speicher
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.)
Nemak Dillingen GmbH
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Nemak Dillingen GmbH
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Filing date
Publication date
Application filed by Nemak Dillingen GmbH filed Critical Nemak Dillingen GmbH
Priority to PL07857208T priority Critical patent/PL2091678T3/pl
Publication of EP2091678A1 publication Critical patent/EP2091678A1/fr
Application granted granted Critical
Publication of EP2091678B1 publication Critical patent/EP2091678B1/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
    • 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
    • B22C9/101—Permanent cores
    • 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 invention relates to a casting mold for casting a casting, which is composed of moldings and casting cores made of molding sand and has at least one casting core for imaging a space in the casting.
  • Molds of this type are used in particular for casting engine blocks for internal combustion engines.
  • the casting core in the engine block casting forms the respective combustion chamber, while the other molded part depicts the top surface of the engine block on which the cylinder head of the respective internal combustion engine is placed and fastened, if necessary, during assembly as an attachment.
  • the cylinder cavities of the engine block molded by molds inserted into the sand mold, which consist of a brass material.
  • the aluminum solidifies faster than on the surface of the sand mold due to the higher thermal conductivity of the metal of the mold. This creates there up to a sufficient Depth a structure that has a higher resistance to the stresses occurring in practical use on the running surfaces of the cylinder loads.
  • the casting mold is a combination of sand casting and chill casting.
  • the mold forms the outer contour of the casting and serves to preheat for casting the critical with respect to the course of solidification part of the casting mold.
  • the mold can be specifically heated, so that a uniform solidification profile is ensured and as homogeneously distributed mechanical properties of the casting are achieved.
  • the outer contour of the casting determining outer parts are made of metal.
  • existing casting cores are used from molding sand. These are held in place by means of cooling iron.
  • the casting cores define between them a narrow channel, which is filled with casting material during casting.
  • the cores holding the cores are passed through the outer mold halves and thereby isolated from the metal of the outer mold halves, that there takes place the lowest possible heat flow.
  • the cooling iron with its free ends beyond the mold halves, so that there takes place air cooling.
  • the purpose of the arrangement of the cooling irons in the casting cores is to adapt the course of solidification in the region of the narrow channel enclosed by the casting cores to the solidification profile of the metal present in the region between the outer peripheral surface of the cores and the metallic outer forms. Problems such as cracks and the like that might otherwise be caused by uneven shrinkage of the casting material upon solidification should be avoided.
  • the object of the invention was to provide a casting mold which makes it possible in a simple manner to produce castings in which at least one locally narrowly defined section is formed with a structure that is different from the rest of the casting , In addition, an advantageous use of such a mold should be specified.
  • the casting core which depicts the respective space in the casting is divided into at least two sections.
  • the first section is formed by a chill, while the other section consists of sand usually used in the sand casting molding sand.
  • Such molding sands are known to be mixtures of a generally free-flowing molding base material and a binder. This molding sand mixture is formed in a core molding tool to the respective molding or casting core and solidified by a suitable mechanical, chemical and / or thermal treatment so that the obtained part or core has a sufficient dimensional stability for the casting process.
  • the cooling mold used according to the invention as part of the casting core forming the space has according to the invention a much higher thermal conductivity than the molding sand from which the remainder of the casting core is made. Accordingly, in the region of the casting mold in which the melt poured into the casting mold comes into contact with the cooling mold, a locally limited accelerated cooling occurs. By choosing the material and the volume of the chill mold, the speed with which the locally limited cooling takes place and the amount of heat removed from the casting metal can be influenced directly.
  • the expansion of the region over which the purposefully accelerated removal of heat should take place can be adjusted in a simple manner by the shape of the mold by the shaping of the casting mold. If, for example, during the casting of an engine block, the casting material to be imaged in the engine block is purposefully and massively cooled over a specific partial length of the cylinder space, the casting core representing the respective cylinder space is provided with an annular cooling mold whose height taking into account the thermal migration of the selectively cooled partial length of the cylinder chamber corresponds.
  • cooling mold according to the invention used before their use must not be subjected to a special surface treatment or preheated.
  • a mold used according to the invention gives such a good surface quality in the area of the casting material coming into contact with it that the mold can be inserted into the casting mold without a finishing order. Accordingly, in a casting mold according to the invention, the casting material comes into direct contact with the mold, so that a particularly rapid heat removal impeded by any intermediate layer acting as an insulator occurs.
  • the invention thus enables the cost-effective production of castings, in which locally closely bounded zones with a cast structure produced by accelerated cooling are present in the region of a space to be formed in each case in the castings.
  • a particularly advantageous in terms of mass production variant of the invention provides that the chill is made of cast iron. Chill molds made of cast iron can be produced inexpensively and have a favorable thermal conductivity with regard to the processing objective sought here.
  • a casting mold according to the invention is particularly suitable for the production of such castings in which, in the region of a transition between the space to be produced in the casting and a mounting surface, the structure which becomes fair during operation is to be produced.
  • An embodiment of the invention which is important for practical use therefore provides that at least one of the mold parts of a casting mold according to the invention forms a mounting surface on which an attachment can be mounted on the casting after its solidification and the mold core adjoins this molded part, in particular with the cooling mold ,
  • the thermal conductivity of the cooling mold should also be many times higher than the thermal conductivity of the molded part imaging the mounting surface.
  • the correct position assignment of the chill mold and the remaining portion of the space in the casting casting core can be ensured with ease of use that are formed on the chill and the remaining portion of the casting mold form elements over which the chill mold and the remaining portion of the mold core with each other are connected.
  • the cooling mold is used in such a way that it cools a zone of the casting to be produced in the mounting surface, then it is favorable if at least one molding element is formed on the cooling mold and engages in a correspondingly shaped recess of the molding.
  • This form element is preferably formed as a projection engaging in the molding.
  • the cooling mold which engages in the respective molded part projects beyond the mounting surface to be produced on the casting, so that the formation of burrs or comparable shape defects in the area of the opening of the respective cylinder space is reliably prevented.
  • the inner surface of the projection relative to the longitudinal axis of the chill is tapered so that widens the diameter of the opening of the casting core in the direction of the molding, while the demolding of the chill mold from the finished casting can be additionally facilitated.
  • the casting core with the cooling mold is held by a punch extending into the casting core.
  • This stamp can be used on the one hand for exactly positioned holding of the casting core become.
  • such a stamp when it is coupled with a corresponding adjusting device, allows automatic assembly of the casting core itself.
  • liners are, for example, made of cast iron prefabricated tubular components whose inner diameter corresponds to the inner diameter of the cylindrical space to be imaged in the engine block and whose inner surfaces in the finished engine block form the running surfaces along which the pistons of the internal combustion engine move during operation. Even with a casting mold according to the invention, liners can be poured into the casting to be produced while simultaneously exploiting the advantages of the invention if the casting core carries on its outer surface a liner to be cast into the casting.
  • the single figure shows schematically a mold G for casting an engine block for a in-line four-cylinder internal combustion engine.
  • the casting mold 1 is composed of various molded parts 1, 2, 3, 3 and casting cores 4, 5, 6, 7 each consisting of molding sand prefabricated section 8 and a cooling mold 9 are formed.
  • shaped part 1 shown in the figure above is a so-called “sole core”, which on the engine block to be cast the mounting surface 10, also called “top DeckFläche” maps, at the in the course of assembly of the engine one not here shown cylinder head is attached.
  • the opposite to the molded part 1 arranged molding 2 represents the so-called “crank chamber core”, which images the crankcase on the engine block to be cast.
  • the casting cores 4,5,6,7 are each held by a stamp 11,12,13,14.
  • the punches 11-14 are coupled to an adjusting device (not shown here), which move them from an assembly position in which the casting cores 4, 5, 6, 7, 7 are mounted on them into the position shown in the figure.
  • the front projecting into the respective casting core 4-7 section 15 of the punches 11-14 is formed over the entire height of the cores 4-7 tapered in the direction of the free punch end to the punch 11-14 after completion of the casting process unhindered from the Casting cores 4-7 to be able to pull.
  • the molded sand section 8 of the casting cores 4-7 has a cup-like shape, wherein the surrounding of its interior is adapted to the shape of the front portion 15 of the punches 11-14, that the relevant section 15 is positively seated in the interior.
  • a respective centrally disposed on the front side of the casting cores 4-7 projection 16 is formed, which in a corresponding shaped recess 17 of the molding 2 engages and is also held positively held therein.
  • the monolithic block made of gray iron made of cooling mold 9 associated edge, the section 8 of the cores 4-7 each have a circumferential shoulder 18, in which an annular circumferential, to the section 8 associated front edge of the mold 9 molded projection 19 attacks.
  • the cooling molds 9 of the casting cores 4-7 are positively coupled to the section 8 of the respective casting core 4-7 made of molding sand.
  • the cooling molds 9 themselves have an annular shape.
  • the interior surrounded by them is adapted to the shape of the front, each associated with them portion 15 of the punches 11-14 has, so that the cooling molds 9 are also held positively and substantially free of play on their respective associated punch 11-14 ,
  • a circumferential projection 20 is likewise integrally formed on the cooling molds 9, the outer peripheral surface of which, as in the case of the projection 19, merges without failure into the peripheral surface 21 of the main section of the respective cooling mold 9.
  • the cooling molds 9 in this case have a tapering in the direction of the free end of its projection 19, slightly conical shape.
  • the inner surface of the cooling molds 9 is inclined.
  • the conical outer shape of the chill molds 9 facilitates the demoulding of the chill molds 9 from a liner 22, which is held in a form-fitting manner by the respective casting core 4-7 and, after completion of the solidification, remains in the engine block to be cast in the casting mold G.
  • the liners 22 surround the cylinder spaces imaged by the casting cores 4-7 in the engine block.
  • the height of the projections 20 of the chill molds 9 is dimensioned so that they grip in each case a correspondingly shaped recess 23 of the molded part 1 with casting cores 4-7 and molded parts 1-3 positioned completely in the casting mold G beyond the mounting surface 10. In this way, a degree of formation in the region of the opening of the cylinder chambers of the engine block to be cast is reliably prevented.
  • feeders and filling channels are formed in a manner known per se, via which aluminum melt poured into the casting mold G flows into the mold cavity 24 surrounded by the casting mold G.
  • the thereby reaching into the cooling molds 9 adjacent areas 25 of the mold cavity 24 melt is extracted over the liner 22 and the respective cooling mold 9 accelerated heat so that it solidifies faster than the present in the other zones of the mold cavity 24 melt.
  • a directional, finer-grained microstructure is created, so that the section of the area adjacent to the mounting area 10 which is particularly stressed in this area Engine block safely withstand the occurring in practical operation thermal and mechanical loads.

Claims (12)

  1. Moule de coulée pour la coulée d'une pièce moulée, qui est composé de pièces de moule (1, 2, 3), fabriquées en sable de coulée, et de noyaux de coulée (4,5,6,7) et qui est doté d'au moins un noyau de coulée (4,5,6,7) destiné à former une enceinte dans la pièce moulée,
    c a r a c t é r i s é e n c e q u' une zone du noyau de coulée (4,5,6,7), prévu pour le réalisation de l'enceinte dans la pièce moulée, est formée par une coquille de refroidissement (9), qui est fabriquée en matériau dont la conductivité thermique est supérieure d'un multiple à la conductivité thermique du reste (8) du noyau de coulée (4,5,6,7) fabriqué en sable de coulée.
  2. Moule de coulée selon la revendication 1,
    caractérisé en ce que la coquille de refroidissement (9) est fabriquée en fonte de fer.
  3. Moule de coulée selon revendication 1 ou 2,
    caractérisé en ce qu'au moins l'une des pièces (1) du moule de coulée (G) forme, sur la pièce moulée, une surface de montage (10) sur laquelle un accessoire peut être monté après solidification, et que le noyau de coulée (4,5,6,7) est adjacent à cette pièce de moule (1).
  4. Moule de coulée selon la revendication 3,
    caractérisé en ce que la conductivité thermique de la coquille de refroidissement (9) est supérieure d'un multiple à la conductivité thermique de la pièce de moule (1) qui réalise la surface de montage (10).
  5. Moule de coulée selon l'une des revendications précédentes,
    caractérisé en ce que, sur la coquille de refroidissement (9) et sur le reste (8) du noyau de coulée (4,5,6,7), est formé au moins un élément (19) par l'intermédiaire duquel la coquille de refroidissement (9) et le reste (8) du noyau de coulée (4,5,6,7) sont reliés ensemble par emboîtement.
  6. Moule de coulée selon l'une des revendications précédentes,
    caractérisé en ce que, sur la coquille de refroidissement (9) est formé au moins un élément (20), qui s'emboîte dans un évidement (23) de la pièce de moule (1) qui est configuré de manière correspondante.
  7. Moule de coulée selon la revendication 6,
    caractérisé en ce que l'élément est réalisé en forme de saillie (20) qui s'engage dans la pièce de moule (1).
  8. Moule de coulée selon la revendication 7,
    caractérisé en ce que la face intérieure de la saillie (20) est oblique par rapport à l'axe longitudinal (L) de la coquille de refroidissement (9).
  9. Moule de coulée selon revendication 7 ou 8,
    caractérisé en ce que la saillie s'engage dans la pièce de moule (1) au-delà de la surface de montage (10).
  10. Moule de coulée selon l'une des revendications précédentes,
    caractérisé en ce que le noyau de coulée (4,5,6,7) est maintenu avec la coquille de refroidissement (9) par un poinçon (11,12,13,14) qui parvient jusque dans le noyau de coulee (4,5,6,7).
  11. Moule de coulée selon l'une des revendications précédentes,
    caractérisé en ce que le noyau de coulée (4,5,6,7) porte sur sa face extérieure un liner (22) qui, dans la pièce moulée finie, forme la paroi intérieure de l'enceinte devant être réalisée par le noyau de coulée (4,5,6,7).
  12. Utilisation d'un moule de coulée (G) réalisé selon l'une des revendications 1 à 11 pour la coulée d'un bloc moteur pour un moteur à combustion.
EP07857208.8A 2006-11-10 2007-11-09 Moule de coulée pour la coulée d'une pièce et utilisation de ce moule de coulée Active EP2091678B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07857208T PL2091678T3 (pl) 2006-11-10 2007-11-09 Forma odlewnicza do odlewania odlewu i zastosowanie takiej formy odlewniczej

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006053404A DE102006053404A1 (de) 2006-11-10 2006-11-10 Gießform zum Gießen eines Gussteils und Verwendung einer solchen Gießform
PCT/EP2007/062131 WO2008055973A1 (fr) 2006-11-10 2007-11-09 Moule de coulée pour la coulée d'une pièce et utilisation de ce moule de coulée

Publications (2)

Publication Number Publication Date
EP2091678A1 EP2091678A1 (fr) 2009-08-26
EP2091678B1 true EP2091678B1 (fr) 2015-05-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07857208.8A Active EP2091678B1 (fr) 2006-11-10 2007-11-09 Moule de coulée pour la coulée d'une pièce et utilisation de ce moule de coulée

Country Status (10)

Country Link
US (1) US20100139884A1 (fr)
EP (1) EP2091678B1 (fr)
JP (1) JP2010509070A (fr)
KR (1) KR20090077949A (fr)
CN (1) CN101547760B (fr)
DE (2) DE102006053404A1 (fr)
MX (1) MX2009004733A (fr)
PL (1) PL2091678T3 (fr)
RU (1) RU2432223C2 (fr)
WO (1) WO2008055973A1 (fr)

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KR101224988B1 (ko) * 2011-07-29 2013-01-22 현대제철 주식회사 열간압연롤 주조용 몰드
KR101224990B1 (ko) * 2011-08-30 2013-01-22 현대제철 주식회사 열간압연롤 주조용 몰드의 제조방법
CN102380581B (zh) * 2011-10-28 2013-04-24 刘天平 一种壳体铸件芯撑间隔层叠多组芯工艺方法
CN102921897B (zh) * 2012-09-27 2015-01-07 贺秉祥 一种用于汽车发动机铸件组合型芯的浇注生产工艺
KR101340890B1 (ko) * 2013-07-02 2013-12-13 (주) 캐스텍코리아 주형 및 이를 이용한 주조방법
DE102014109598A1 (de) 2014-07-09 2016-01-14 Tenedora Nemak, S.A. De C.V. Gießkern, Verwendung eines Gießkerns und Verfahren zur Herstellung eines Gießkerns
CN104826986A (zh) * 2015-04-20 2015-08-12 鞍山千钢机械制造有限公司 防止砂型铸造铸件粘砂的方法及砂型预制件
DE102015225588A1 (de) 2015-12-17 2017-06-22 Volkswagen Aktiengesellschaft Gießverfahren und Kühleinsatz zur Herstellung eines Gussteiles
CN108326264A (zh) * 2018-03-06 2018-07-27 溧阳市联华机械制造有限公司 一种冷芯盒制作石墨成型冷铁的方法
CN108262449A (zh) * 2018-03-06 2018-07-10 溧阳市联华机械制造有限公司 一种热芯盒制作石墨成型冷铁的方法
DE102019110580A1 (de) * 2019-04-24 2020-10-29 Nemak, S.A.B. De C.V. Vorrichtung und Verfahren zur Entnahme mindestens eines Kühlelementes aus einem wenigstens teilweise entformten Gussteil, Verfahren zur Einbringung mindestens eines Kühlelementes in einen Formkern einer Gussteilform, Kühlelement sowie Gussteil
US11654476B2 (en) * 2020-09-28 2023-05-23 GM Global Technology Operations LLC Hybrid core for manufacturing of castings
US11554413B2 (en) * 2021-02-01 2023-01-17 GM Global Technology Operations LLC Hybrid cam bore sand core with metal chills for cast aluminum block
US20220241847A1 (en) * 2021-02-01 2022-08-04 GM Global Technology Operations LLC Profile chill for forming a cast device
KR102609755B1 (ko) 2023-02-06 2023-12-05 주식회사 한국귀금속보석 중량 조절이 가능한 주물틀

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Also Published As

Publication number Publication date
RU2432223C2 (ru) 2011-10-27
RU2009122220A (ru) 2010-12-20
JP2010509070A (ja) 2010-03-25
WO2008055973A1 (fr) 2008-05-15
DE102006053404A1 (de) 2008-05-15
CN101547760A (zh) 2009-09-30
MX2009004733A (es) 2009-06-22
US20100139884A1 (en) 2010-06-10
PL2091678T3 (pl) 2015-10-30
DE202007018797U1 (de) 2009-04-23
EP2091678A1 (fr) 2009-08-26
CN101547760B (zh) 2013-04-10
KR20090077949A (ko) 2009-07-16

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