WO2016087237A1 - Procédé de fabrication d'un noyau de coulée perdu, noyau de coulée perdu et piston à conduit de refroidissement fabriqué à l'aide d'un tel noyau de coulée - Google Patents

Procédé de fabrication d'un noyau de coulée perdu, noyau de coulée perdu et piston à conduit de refroidissement fabriqué à l'aide d'un tel noyau de coulée Download PDF

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Publication number
WO2016087237A1
WO2016087237A1 PCT/EP2015/077253 EP2015077253W WO2016087237A1 WO 2016087237 A1 WO2016087237 A1 WO 2016087237A1 EP 2015077253 W EP2015077253 W EP 2015077253W WO 2016087237 A1 WO2016087237 A1 WO 2016087237A1
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WO
WIPO (PCT)
Prior art keywords
core
cooling channel
casting core
casting
insert
Prior art date
Application number
PCT/EP2015/077253
Other languages
German (de)
English (en)
Inventor
Wolfgang Issler
Original Assignee
Mahle International Gmbh
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.)
Filing date
Publication date
Application filed by Mahle International Gmbh filed Critical Mahle International Gmbh
Publication of WO2016087237A1 publication Critical patent/WO2016087237A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or 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

Definitions

  • the present invention relates to a method for producing a lost casting core, to such a casting core and to a cooling channel piston produced using such a casting core.
  • Sand cores and salt cores are known in particular in the prior art. Sand cores are used in particular for the production of large cast workpieces. Sand cores and salt cores find a variety of applications, in particular for the production of cast pistons with closed cooling channel. After casting the cast workpiece, the casting core is removed from the cast workpiece in a manner known per se by dissolving, for example, rinsing.
  • Salt cores are usually prepared on the basis of sodium chloride, which is optionally provided with additives known in the art.
  • a green compact is produced by cold pressing of the material, which has a shape similar to the cooling channel to be produced and this sintered at about 800 ° C usually. If necessary, the resulting sintered component can be brought into the final shape corresponding to the cooling channel to be produced by mechanical post-processing.
  • the resulting salt core generally has a surface roughness RZ of 30 ⁇ to 60 ⁇ .
  • RZ surface roughness
  • the object of the present invention is to provide a method for producing a piston and a piston, which ensures a particularly effective heat transfer between the piston material and the cooling oil circulating in the cooling channel.
  • the solution consists in a method comprising the steps of: a) providing a mold with a cavity enclosed by at least two mold halves for forming a core blank; b) at least partially lining at least one mold half with at least one apertured insert; c) forming a core blank of a core material by inserting the at least one insert into the surface of the core blank; d) removing the core blank with the embedded in its surface at least one insert from the mold; e) removing the at least one insert from the surface of the core blank so as to result in a finished core having a textured surface.
  • the present invention further provides a casting core producible by such a method and a cooling channel piston produced using such a casting core.
  • the method according to the invention is characterized in that a casting core with a specifically structured surface can be produced in a particularly simple manner, wherein the parameters of the method according to the invention are obtained. numbering, cross-sectional shape, length, width and in particular the depth.
  • the cooling channel piston according to the invention accordingly has a closed circumferential cooling channel, the surface of which is correspondingly structured specifically, ie provided with local elevations which correspond to the depressions in the surface of the casting core.
  • the surface of the cooling channel itself is increased, so that the heat transfer from the piston material to the circulating in the cooling channel oil in engine operation is significantly improved.
  • the turbulence of the cooling oil is improved in the cooling channel by an increased turbulence and thus an improved heat transfer from the piston material are produced to the cooling oil.
  • the cooling of the cooling channel piston is significantly improved and its temperature in engine operation thus lowered more than in the prior art.
  • the inventive method is technically easy to implement and can be easily integrated into existing production lines.
  • the process according to the invention is particularly suitable for use in all known pressing or casting processes for casting cores.
  • step b) an insert made of a metallic material is used, which is in particular pressure and temperature resistant. But it is also conceivable to use a corresponding pressure and temperature-resistant polymer material.
  • the at least one insert used in step b) preferably has the form of a fabric, a grid, a mesh, a mesh, a screen, a perforated sheet or a perforated plate and can then be produced in a particularly simple manner from corresponding semi-finished products.
  • an insert is used, which is made of wire with a diameter of 0.01 mm to 0.3 mm and is therefore suitable for numerous piston sizes with appropriately sized cooling channels.
  • the distance from wire to wire can be 1 mm to 5 mm.
  • the inventive method is particularly suitable for the production of sand cores and salt cores.
  • preference is given to using a salt material based on NaCl and / or KCl.
  • the core blank obtained in step d) before step e) is subjected to a sintering process known per se.
  • the salt core obtained in step e) may be subjected to a sintering process.
  • the use of at least one insert of a polymer material is advantageous, which decomposes thermally during the sintering process. This eliminates the separate process step of mechanically removing the at least one insert from the surface of the core blank.
  • the resulting casting core has recesses with a depth of preferably 0.05 mm to 0.5 mm on its surface. Accordingly, the surface of the cooling channel of the cooling channel piston according to the invention has elevations with a height of preferably 0.05 mm to 0.5 mm.
  • the inventive method is particularly suitable for producing cooling channel piston made of a material based on aluminum, in particular an aluminum-silicon casting alloy.
  • FIG. 2a shows an embodiment of a semifinished product used to produce an insert provided according to the invention in a plan view
  • Figure 2b is a section along the line IIb - IIb in Figure 2a;
  • FIG. 3 is a sectional view of the cavity of a pressing tool lined with an insert made from the semi-finished product according to FIGS. 2a and 2b;
  • Figure 3 produced salt core blank in section
  • FIG. 5 shows a finished salt core from a salt core blank according to FIG. 4 in FIG.
  • the method according to the invention is described by way of example with reference to the production of a cooling channel piston using a salt core, but is suitable for all production methods for cast workpieces using a casting core.
  • FIG. 1 shows by way of example a one-piece cast cooling channel piston 10.
  • the cooling channel piston 10 has a piston head 1 1 with a piston head 12, in which a combustion bowl 13 is introduced.
  • the piston head 1 1 also has a land 14 and a ring portion 15 with annular grooves for receiving piston rings (not shown).
  • the piston is provided at the level of the ring section 15 with a circumferential closed cooling channel 16.
  • the piston also has, in a manner known per se, a piston shaft 17 with piston hubs 18, which are provided with hub bores 19 for receiving a piston pin (not shown).
  • the piston hubs 18 are connected in a conventional manner via treads 21 with each other.
  • the circumferential cooling channel 16 has a structured surface with elevations 16a whose dimensions, in particular their number and height, are specifically set.
  • Figures 2a and 2b show an embodiment of a semifinished product 30 in the form of a flat perforated plate 31 with openings 32.
  • the perforated plate 31 is in the embodiment of a metallic material, for example. A steel sheet.
  • the semi-finished products can be chosen arbitrarily, if they can be produced from openings having inserts. Examples include fabrics, meshes, meshes, meshes, screens or perforated sheets.
  • FIG 3 shows a section of a pressing tool 40 with two mold halves 40a, 40b, which enclose a cavity 41 for pressing a salt core.
  • Such pressing tools are known per se.
  • each mold half 40a, 40b each lined with an insert 50.
  • Each section 31 a, 31 b is brought in a conventional manner by means of a corresponding punch in a form that corresponds to the inner contour of each mold half 40 a, 40 b substantially, so that the resulting inserts 50 are inserted as possible in a form-fitting manner in the mold halves 40 a, 40 b can.
  • both mold halves 40a, 40b are completely lined with one insert part 50 each.
  • the mold halves depending on the requirements of the case, may be only partially lined with at least one insert.
  • only one mold half 40a, 40b may be wholly or partially lined with at least one insert. In these cases, cores result, the surface of which is partially structured.
  • a salt core blank 60 is pressed by means of the pressing tool 40, in that the cavity 41 lined with the inserts 50 is filled with a salt material which is pressed under pressure with a corresponding pressure to the salt core blank 60.
  • the openings 32 are filled with the salt material.
  • the salt core blank 60 resulting in the exemplary embodiment is shown in FIG.
  • the salt core blank 60 is characterized in that the inserts 50 are embedded in its surface 61. This results as a result of the pressing process and the penetration of the salt material in the openings 32 of the perforated plate 31st Finally, the inserts 50 are removed from the surface 61 of the salt core blank, so that a salt core 70 according to the invention results, which has recesses 72 on its surface 71.
  • the depressions are present in a defined number, length, width, cross-sectional shape and depth.
  • the salt core blank 60 or the salt core 70 can be subjected to a sintering process known per se.
  • the salt core 70 is inserted in a manner known per se into a corresponding casting mold and encapsulated with a metallic material, for example based on aluminum. After completion of the casting process is a piston blank with cast salt core 70 before. The piston blank is finished in a known manner, and the salt core 70 rinsed with water. The result is the cooling channel piston 10 according to FIG. 1.

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

Abstract

La présente invention concerne un procédé de fabrication d'un noyau de coulée perdu (70), caractérisé par les étapes caractéristiques suivantes consistant à : a) produire un un outil de moulage (40) pourvu d'une cavité (41) enfermée par au moins deux moitiés de moule (40a, 40b) et destinée à former une ébauche de noyau (60) ; b) garnir au moins partiellement au moins une moitié de moule (40a, 40b) avec au moins un élément d'insertion (50) pourvu d'orifices ; c) mouler une ébauche de noyau (60) à partir d'une matière de noyau par introduction d'au moins un élément d'insertion (50) dans la surface (61) de l'ébauche de noyau (60) ; d) retirer de l'outil de moulage (40) l'ébauche de noyau (60) conjointement avec l'au moins un élément d'insertion (50) introduit dans sa surface (61) ; e) retirer l'au moins un élément d'insertion (50) de la surface (61) de l'ébauche de noyau (60) de façon à obtenir un noyau de coulée fini (70) pourvu d'une surface structurée (71). La présente invention concerne en outre un tel noyau de coulée (70) et un piston à conduit de refroidissement (10) pouvant être fabriqué à l'aide d'un tel noyau de coulée (10).
PCT/EP2015/077253 2014-12-02 2015-11-20 Procédé de fabrication d'un noyau de coulée perdu, noyau de coulée perdu et piston à conduit de refroidissement fabriqué à l'aide d'un tel noyau de coulée WO2016087237A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014017721.1A DE102014017721A1 (de) 2014-12-02 2014-12-02 Verfahren zum Herstellen eines verlorenen Gießkerns, Gießkern sowie unter Verwendung eines derartigen Gießkerns hergestellter Kühlkanalkolben
DE102014017721.1 2014-12-02

Publications (1)

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WO2016087237A1 true WO2016087237A1 (fr) 2016-06-09

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DE (1) DE102014017721A1 (fr)
WO (1) WO2016087237A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020023411A1 (fr) 2018-07-25 2020-01-30 Novozymes A/S Levure exprimant une enzyme pour la production d'éthanol
WO2020076697A1 (fr) 2018-10-08 2020-04-16 Novozymes A/S Levure exprimant une enzyme pour la production d'éthanol
WO2021025872A1 (fr) 2019-08-06 2021-02-11 Novozymes A/S Protéines de fusion pour une expression enzymatique améliorée
WO2021055395A1 (fr) 2019-09-16 2021-03-25 Novozymes A/S Polypeptides dotés d'une activité bêta-glucanase et polynucléotides codant pour ces polypeptides
WO2021119304A1 (fr) 2019-12-10 2021-06-17 Novozymes A/S Micro-organisme pour une fermentation de pentose améliorée
WO2021163030A2 (fr) 2020-02-10 2021-08-19 Novozymes A/S Polypeptides ayant une activité alpha-amylase et polynucléotides codant pour ces derniers
WO2022049250A1 (fr) 2020-09-04 2022-03-10 Novozymes A/S Organisme de fermentation améliorée de production d'éthanol
WO2022090564A1 (fr) 2020-11-02 2022-05-05 Novozymes A/S Variants de glucoamylase et polynucléotides codant pour ceux-ci
WO2022261003A1 (fr) 2021-06-07 2022-12-15 Novozymes A/S Micro-organisme génétiquement modifié pour une fermentation d'éthanol améliorée
WO2024064901A2 (fr) 2022-09-23 2024-03-28 Novozymes A/S Organisme de fermentation améliorée de production d'éthanol
WO2024137704A2 (fr) 2022-12-19 2024-06-27 Novozymes A/S Procédés de production de produits de fermentation faisant appel à des enzymes de dégradation de fibres avec levure modifiée

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016216916A1 (de) 2016-09-07 2018-03-08 Volkswagen Aktiengesellschaft Gussform, insbesondere Hohlgussform für ein Schwerkraftkokillengussverfahren und Verfahren zur Herstellung einer Gussform
DE102017205804A1 (de) * 2017-04-05 2018-10-11 Mahle International Gmbh Kolben einer Brennkraftmaschine
DE102022200902A1 (de) * 2022-01-27 2023-07-27 Volkswagen Aktiengesellschaft Gießform zum Kokillengießen

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US20050205229A1 (en) * 2004-03-17 2005-09-22 Jiaren Jiang Surface modification of castings
EP1854568A1 (fr) * 2006-05-09 2007-11-14 K1 GmbH Procédé de prise d'empreinte de surfaces de forme libre en trois dimensions dotées de surfaces microstructurées
GB2438337A (en) * 2005-02-23 2007-11-21 Sekisui Plastics Process for producing forming metal mold and forming metal mold
DE102008028197A1 (de) * 2008-06-12 2009-12-17 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung

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DE102009015984A1 (de) 2009-04-02 2010-10-07 Daimler Ag Verfahren zur Herstellung eines Salzkerns für Metallgussverfahren

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Publication number Priority date Publication date Assignee Title
US20050205229A1 (en) * 2004-03-17 2005-09-22 Jiaren Jiang Surface modification of castings
GB2438337A (en) * 2005-02-23 2007-11-21 Sekisui Plastics Process for producing forming metal mold and forming metal mold
EP1854568A1 (fr) * 2006-05-09 2007-11-14 K1 GmbH Procédé de prise d'empreinte de surfaces de forme libre en trois dimensions dotées de surfaces microstructurées
DE102008028197A1 (de) * 2008-06-12 2009-12-17 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020023411A1 (fr) 2018-07-25 2020-01-30 Novozymes A/S Levure exprimant une enzyme pour la production d'éthanol
WO2020076697A1 (fr) 2018-10-08 2020-04-16 Novozymes A/S Levure exprimant une enzyme pour la production d'éthanol
WO2021025872A1 (fr) 2019-08-06 2021-02-11 Novozymes A/S Protéines de fusion pour une expression enzymatique améliorée
WO2021055395A1 (fr) 2019-09-16 2021-03-25 Novozymes A/S Polypeptides dotés d'une activité bêta-glucanase et polynucléotides codant pour ces polypeptides
WO2021119304A1 (fr) 2019-12-10 2021-06-17 Novozymes A/S Micro-organisme pour une fermentation de pentose améliorée
WO2021163030A2 (fr) 2020-02-10 2021-08-19 Novozymes A/S Polypeptides ayant une activité alpha-amylase et polynucléotides codant pour ces derniers
WO2022049250A1 (fr) 2020-09-04 2022-03-10 Novozymes A/S Organisme de fermentation améliorée de production d'éthanol
WO2022090564A1 (fr) 2020-11-02 2022-05-05 Novozymes A/S Variants de glucoamylase et polynucléotides codant pour ceux-ci
WO2022261003A1 (fr) 2021-06-07 2022-12-15 Novozymes A/S Micro-organisme génétiquement modifié pour une fermentation d'éthanol améliorée
WO2024064901A2 (fr) 2022-09-23 2024-03-28 Novozymes A/S Organisme de fermentation améliorée de production d'éthanol
WO2024137704A2 (fr) 2022-12-19 2024-06-27 Novozymes A/S Procédés de production de produits de fermentation faisant appel à des enzymes de dégradation de fibres avec levure modifiée

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