EP2340901B1 - Procédé de fabrication d'une pièce en fonte - Google Patents

Procédé de fabrication d'une pièce en fonte Download PDF

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Publication number
EP2340901B1
EP2340901B1 EP10194254.8A EP10194254A EP2340901B1 EP 2340901 B1 EP2340901 B1 EP 2340901B1 EP 10194254 A EP10194254 A EP 10194254A EP 2340901 B1 EP2340901 B1 EP 2340901B1
Authority
EP
European Patent Office
Prior art keywords
feeder
casting
core
engine block
mold
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
EP10194254.8A
Other languages
German (de)
English (en)
Other versions
EP2340901A1 (fr
EP2340901B9 (fr
Inventor
Thomas Schwabl
Richard Schächtl
Josef Gibis
Stefan Schmidberger
Thomas Heller
Andreas Fent
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP2340901A1 publication Critical patent/EP2340901A1/fr
Publication of EP2340901B1 publication Critical patent/EP2340901B1/fr
Application granted granted Critical
Publication of EP2340901B9 publication Critical patent/EP2340901B9/fr
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Classifications

    • 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
    • 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
    • B22C9/108—Installation of cores
    • 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
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product

Definitions

  • the invention relates to a method for producing a casting, in particular an engine block, comprising the steps of: producing a feeder core, inserting the feeder core into a casting mold and filling the casting mold with a liquid metal.
  • crankcases and engine blocks are manufactured in various casting processes known in the art.
  • Highly stressed crankcases or engine blocks used in engines such as diesel engines or turbocharged supercharged engines are manufactured in low pressure, core packaged, or gravity casting. In these methods, the solidification of the liquid material from the cylinder head side to the crank chamber side or from the crank chamber side of the engine block to the cylinder head side.
  • the US 1,670,725 shows a method and apparatus for casting wheel hubs.
  • the JP 57 103 755 shows a method for producing cast components with a feeder core, in which the outlet opening of the feeder is optimized from the feeder core by suitable geometrical measures.
  • crankcase side bearing block or the combustion chamber web on the cylinder head solidifies faster than the respective other, opposite end of the engine block by the described solidification course.
  • the solidification time is significantly involved in achieving favorable material properties of the engine block.
  • engine blocks or crankcases produced by the method according to the prior art are either cylinder headboards or high-strength storage chairs.
  • Another disadvantage of the known methods is that the solidification of the tool from one end region to another end region leads to high solidification times and thus to long process times. Furthermore, high mold temperatures are required, resulting in a particularly high wear of the tool.
  • the present invention has for its object to provide a method with improved properties, which overcomes the above-mentioned disadvantages of the prior art.
  • a method for producing a casting comprises the steps of: producing a feeder core, inserting the feeder core into a casting mold and filling the casting mold with a liquid metal. Furthermore, the method may include the step of positioning the feeder core inside the mold. Such a positioning of the feeder core causes the feeding to take place from a central area during the production of the casting.
  • the method may include the step of: creating a recess in the casting by positioning the feeder core at a predetermined position inside the casting mold. Due to the positioning of the feeder core in the interior of the casting mold and thus also in the interior of the cast part to be produced, the feeder core cools down last and thus maintains as long as possible a high component temperature. This allows the feeder to be kept in a liquid to semi-liquid or doughy state for a long time, thereby ensuring that the casting is fed with liquid metal during solidification. As a predetermined position we have a 21491 total.rtf
  • Area preferred which is arranged centrally in the longitudinal, transverse and vertical direction of the casting and thus corresponds to a central area.
  • the method may be characterized in that, after complete filling of the casting mold with liquid metal, the casting is cooled substantially simultaneously, opposite outer regions to the inner region.
  • edge regions of the casting which extend from the surface to the component center.
  • the outer regions preferably correspond to an area where a cylinder head is connected, an area where a crankcase is connected to the engine block, or an area where the crankshaft is supported to the engine block.
  • the method may be characterized in that the casting is removable from the mold when a feeder is inside the feeder core after cooling at least in a partially dough-like state.
  • the method may be characterized in that the feeder is arranged in the interior of at least one cylinder of an engine block to be produced, wherein the feeder is connected to a predetermined area on an inner wall of the cylinder.
  • the invention relates to a casting, in particular a motor block with at least one recess, which in the interior of the Casting is arranged and at least one feeder. Furthermore, the feeder can be provided in the interior of the recess.
  • the recess may have an inner wall, wherein the inner wall is connected in at least one predetermined area with the feeder.
  • FIGS. 1 to 3 show a casting 10 according to the invention, which is shown by way of example in the form of a cylinder block.
  • FIG. 1 shows a plan view of a first outer region 12 of the casting 10.
  • This first outer region 12 corresponds to an upper end portion of the cylinder block 10, on which a cylinder head of the engine can be mounted.
  • the upper outer region 12 thus corresponds to the cylinder head web.
  • two recesses 15 are shown by way of example and not by way of limitation. These recesses 15 are cylinders 15 in which the pistons of the engine are later installed. In the casting 10, these recesses 15 may be provided as through openings with a circular, oval or polygonal cross-section. Alternatively, in the casting 10 immediately after removal from a mold, the recesses 15 may be formed as blind holes with round, oval or polygonal cross-sectional shapes. In both the through-hole embodiment and the blind-hole embodiment, the recesses 15 may have a tapered, prismatic, or cylindrical shape from the cylinder head end to a crankshaft end of the engine block.
  • each feeder 13 are shown, which are arranged substantially coaxially in the recesses 15.
  • the feeders 13 are connected to the cylinder block 10 via feed connections 13a.
  • the recesses 15 have an inner wall 15a, which tapers from the cylinder head side to the crankshaft side of the engine block 10 and in this direction has a tapered, circular cross-section.
  • the feeder connections 13a are connected to the inner wall 15a of the recess 15 in a predetermined area 15b.
  • the predetermined area 15b is located in the region of the casting longitudinal axis, which corresponds to the section line AA at the level of two tie rods 17, which are adjacent in the transverse direction of the engine block, as shown FIG. 1 is recognizable.
  • FIG. 2 is a vertical direction of the casting 10 defined by the arrow Z.
  • the above-mentioned predetermined areas of the memory connection 13b are in casting upright Z below water jackets 14, as shown FIG. 2 seen.
  • the feeder connections 13a extend in the engine block longitudinal direction, namely below the deepest region of the water jackets 26.
  • the water jackets form recesses in the engine block, which are used as cooling channels.
  • these predetermined areas may also extend in the transverse direction of the cylinder block, i. in a direction corresponding to the section lines B-B and C-C.
  • the feeder connections 13a extend substantially perpendicular to the longitudinal direction of the engine block 10, between two longitudinally adjacent tie rods 17, and are connected below the water jacket cores 26 to an inner wall 15a of the recess 15. A diagonal orientation of the feeder connections 13a is also conceivable.
  • the tie-rod regions 17 are regions of material accumulation used during the casting process for distributing liquid metal to achieve better filling of the casting mold 20. In these areas, which can thus be used as channels later holes are provided with threads to which the cylinder head of a motor is screwed.
  • the casting mold 20 comprises at least two side parts 21 a and 21 b, a lower part or a base part 22 and a top part 23. These parts are shaping the outer casting contour and are preferably made of steel.
  • a feeder core 24 is provided inside the casting mold 20, as shown FIG. 4 seen.
  • the FIG. 4 represents a sectional view through a mold along the line BB of the casting 10 from FIG. 1 In other words, one would make the mold 20 for the production of the casting 10 from FIG. 1 Cut along the section BB, so you would make the presentation FIG. 4 receive.
  • the same applies to the presentation FIG. 5 with the difference that the FIG.
  • FIG. 5 a sectional view along the interface CC FIG. 1 equivalent.
  • the tool part is cut in a region between two cylinders adjacent to one another in the longitudinal direction of the engine block.
  • the casting mold 20 has feeds 16 in the lower region. These inlets represent sprues 16, via which the liquid metal is introduced into the mold 20 during the casting process.
  • FIG. 6 shows a sectional view along the section line AA FIG. 1 through the casting mold 20.
  • the feeder cores 24 are arranged centrally in an inner region of the engine block, ie in the transverse direction, and are clamped between the upper part 23 and the lower part 22.
  • the feeder cores 24 have passages 25 through which the liquid metal can flow into a cavity 27.
  • the feeders 13 are formed during the casting process and the feed connections 13a are formed in the passages 25.
  • the feeder core 24 is produced. This has a quill shape, with an inner cavity 27 and is preferably formed of sand.
  • the mold 20 is assembled, wherein the side parts 21 a, 21 b, the lower part 22 and the upper part 23 are aligned and fixed in a predetermined arrangement to each other.
  • the feeder cores 24 are attached at predetermined positions in the mold 20.
  • Water jacket cores 26 are produced in parallel and likewise introduced into the casting mold 20.
  • the water jacket cores 26 are, as well as the feeder cores, formed of sand and serve to hold in the later casting 10 openings that are used as cooling channels. These cooling channels are then flushed in the running engine with a fluid, preferably a cooling liquid or a cooling gas to keep the running engine at operating temperature.
  • the casting mold 20 is filled with liquid metal in the subsequent step.
  • the liquid metal enters the interior via the sprues 16, i. in the inner cavities of the mold 20 and is distributed in the mold 20, where it flows through the passages 25 into the cavity 27 of the feeder cores 24 and forms the feeder 13.
  • the cooling takes place.
  • the casting mold 20 is cooled substantially simultaneously from the upper outer region 12 and from the lower outer region 11.
  • the cylinder head land area 12 and the bearing seat area 11 cool rapidly and thus obtain particularly high strength characteristics. Consequently, in the casting 10, a solidification direction or a course of solidification results, which runs from the cylinder head region 12 and the bearing block region 11, or the region at which the crankcase is screwed, to the center of the casting 10.
  • the feeder 13 acts as a thermal heat storage and solidifies as the last portion of the casting.
  • the casting 10 can also be removed more quickly from the casting mold 20. Since the surface or the outer edge regions are already cooled when the casting 10 is removed, the risk of cracking during removal from the mold 20 is reduced. The complete cooling of the casting 10, or the residual cooling of the feeder 13, can then take place in the ambient air.
  • the method according to the invention provides a significantly shorter demolding time and thus a much shorter cycle time compared to the methods known from the prior art.
  • the positioning of the feeders in a central region of the mold further results in the advantage that smaller feeders can be used so that the circulation material is reduced.
  • the loop material is the material that must be removed from the casting immediately after the casting process, such as sprues, feeders, or machining allowances. These are usually melted down and reused. The smaller the feeders, the lower the circulation material in the process chain, which reduces the energy requirement of the process.
  • the feeder core 24 and the water jacket cores 26 are removed and the feeder 13 and the feeder connections 13a are cut away. Even though reference has been made above to a feeder 13 and a feeder core 24, the same applies to embodiments in which a plurality of feeder cores are used.
  • AlSi7, AlSi8, gray cast iron or any other metal is particularly suitable as material for the engine block or crankcase produced according to the invention.
  • the casting process preferably takes place in the down process, wherein for the filling of the mold 20, in particular the furnace filling level, the component height of the casting mold and the relative arrangement of component and furnace are essential factors.

Claims (6)

  1. Procédé de fabrication d'un bloc moteur (10) comprenant des étapes consistant à :
    - fabriquer un noyau de masselottage (24),
    - introduire ce noyau de masselottage (24) dans un moule de coulée (20),
    - remplir le moule (20) d'un métal liquide,
    caractérisé en ce que
    - le noyau de masselottage (24) est positionné à la partie interne du moule de coulée (20), une masselotte (13) étant prévue dans le noyau de masselottage (24) et cette masselotte (13) étant située à la partie interne d'au moins un cylindre (15) du bloc moteur (10), et étant reliée à une zone prédéfinie de la paroi interne (15a) du cylindre (10), le noyau de masselottage (24) étant en forme d'un fourreau avec une cavité interne (27), et le raccordement de la masselotte (13a) avec le bloc moteur (10) étant prévue à la hauteur du tirant (17).
  2. Procédé de fabrication d'un bloc moteur (10) comprenant des étapes consistant à :
    - fabriquer un noyau de masselottage (24),
    - introduire ce noyau de masselottage (24) dans un moule de coulée (20),
    - remplir ce moule (20) d'un métal liquide,
    caractérisé en ce que
    - le noyau de masselottage (24) est positionné à la partie interne du moule de coulée (20), une masselotte (13) étant prévue dans le noyau de masselotte (24) étant montée à la partie interne d'au moins un cylindre (15) du bloc moteur (10), et étant reliée à une zone prédéterminée de la paroi interne (15a) du cylindre (10), le noyau de masselottage (24) ayant la forme d'un fourreau avec une cavité interne (27) et le raccordement de la masselotte (13b) s'effectuant au dessous d'une enveloppe d'eau (14).
  3. Procédé conforme à la revendication 1,
    caractérisé en ce que
    le raccordement de la masselotte (13a) est situé entre deux tirants d'ancrage (17) voisins.
  4. Procédé conforme à la revendication 1 ou 2,
    caractérisé en ce que
    l'on fabrique un évidement dans le bloc moteur (10) par le positionnement du noyau de masselottage (24) dans une position prédéfinie à la partie interne du moule de coulée (20).
  5. Procédé conforme à l'une des revendications précédentes,
    caractérisé en ce qu'
    après le remplissage total du moule de coulée (24) avec du métal liquide, le bloc moteur est refroidi essentiellement simultanément à partir de zones externes (11, 12) situées à l'opposé vers la zone interne.
  6. Procédé conforme à l'une des revendications précédentes,
    caractérisé en ce que
    le bloc moteur (10) peut être extrait du moule de coulée (20) lorsqu'une masselotte (13) située à la partie interne du noyau de masselottage (24) est après le refroidissement, dans un étant au moins partiellement pâteux.
EP10194254.8A 2009-12-17 2010-12-09 Procédé de fabrication d'une pièce en fonte Active EP2340901B9 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009058730.6A DE102009058730B8 (de) 2009-12-17 2009-12-17 Verfahren zur Herstellung eines Motorblocks

Publications (3)

Publication Number Publication Date
EP2340901A1 EP2340901A1 (fr) 2011-07-06
EP2340901B1 true EP2340901B1 (fr) 2017-03-15
EP2340901B9 EP2340901B9 (fr) 2017-11-01

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Application Number Title Priority Date Filing Date
EP10194254.8A Active EP2340901B9 (fr) 2009-12-17 2010-12-09 Procédé de fabrication d'une pièce en fonte

Country Status (4)

Country Link
EP (1) EP2340901B9 (fr)
DE (1) DE102009058730B8 (fr)
HU (1) HUE034264T2 (fr)
PL (1) PL2340901T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103212669A (zh) * 2012-01-20 2013-07-24 天津市瑞普天晟汽车零部件制造有限公司 一种发动机汽缸体的消失模铸件模型及其铸造方法
DE102012101887B4 (de) 2012-03-06 2018-04-19 Ks Huayu Alutech Gmbh Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses in V-Bauform
CN103521716B (zh) * 2013-10-11 2015-09-23 黄石新兴管业有限公司 一种高质量船用中速系列柴油机前端箱体的铸造方法
NO2756167T3 (fr) 2014-01-29 2018-06-16

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1498197A1 (fr) * 2003-07-18 2005-01-19 Man Nutzfahrzeuge Ag Procédé de coulée de bloc moteur à combustion à pistons alternatifs

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1670725A (en) * 1926-05-28 1928-05-22 Wanner Malleable Castings Comp Method and apparatus for forming castings
JPS57103755A (en) * 1980-12-18 1982-06-28 Hitachi Metals Ltd Mold
DE19803866A1 (de) * 1998-01-31 1999-08-05 Volkswagen Ag Gießform und Verfahren zum Herstellen von Gußstücken
US7438117B2 (en) * 2006-01-19 2008-10-21 Gm Global Technology Operations, Inc. Cylinder block casting bulkhead window formation
DE102008019200A1 (de) * 2008-04-17 2009-10-22 Honsel Ag Verfahren und Anordnung zum Gießen von Leichtmetall-Zylindergehäusen sowie Gießform

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1498197A1 (fr) * 2003-07-18 2005-01-19 Man Nutzfahrzeuge Ag Procédé de coulée de bloc moteur à combustion à pistons alternatifs

Also Published As

Publication number Publication date
DE102009058730B8 (de) 2021-05-20
DE102009058730B4 (de) 2021-03-25
PL2340901T3 (pl) 2017-09-29
DE102009058730A1 (de) 2011-06-22
HUE034264T2 (hu) 2018-02-28
EP2340901A1 (fr) 2011-07-06
EP2340901B9 (fr) 2017-11-01

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