EP3055088B1 - Moule de coulée et piston fabriqué au moyen de celui-ci - Google Patents

Moule de coulée et piston fabriqué au moyen de celui-ci Download PDF

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Publication number
EP3055088B1
EP3055088B1 EP14780430.6A EP14780430A EP3055088B1 EP 3055088 B1 EP3055088 B1 EP 3055088B1 EP 14780430 A EP14780430 A EP 14780430A EP 3055088 B1 EP3055088 B1 EP 3055088B1
Authority
EP
European Patent Office
Prior art keywords
grooves
casting mould
casting
piston
surface texture
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
EP14780430.6A
Other languages
German (de)
English (en)
Other versions
EP3055088A1 (fr
Inventor
Peter Tilch
Dieter Zarges
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
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
Priority to PL14780430T priority Critical patent/PL3055088T3/pl
Publication of EP3055088A1 publication Critical patent/EP3055088A1/fr
Application granted granted Critical
Publication of EP3055088B1 publication Critical patent/EP3055088B1/fr
Active legal-status Critical Current
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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
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2245—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies having walls provided with means for marking or patterning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • 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
    • B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons

Definitions

  • the present invention relates to a casting mold for casting a piston of an internal combustion engine.
  • the invention also relates to a piston cast in such a mold.
  • a surface texture called a waffle pattern has proved favorable in the art, by means of which not only the flowability of the casting material but also the air removal can be improved.
  • a disadvantage of the known waffle pattern is that it must be introduced in the pulling direction of the casting mold, since a demolding of the cast piston, which is outside the Waffelmusterausformschrägen, generates an undercut and thereby can lead to damage of the cast piston.
  • such surface textures are certainly desirable, not only for improved air removal, but also for indicating the origin of the piston produced with this mold.
  • the present invention therefore deals with the problem of specifying a casting mold, which in particular has a significantly increased flexibility with respect to a demolding direction.
  • the present invention is based on the general idea, in a conventional casting mold for casting a piston of an internal combustion engine
  • the present invention is based on the general idea to provide a surface texture formed by grooves in a known per se for casting a piston of an internal combustion engine now in the region of a later inner surface of a piston skirt, the demolding of the casting blank to approximately 90 ° to the surface texture, that is parallel to the surface texture.
  • the grooves forming the surface texture according to the invention have a depth of 0.2 mm ⁇ t ⁇ 0.5 mm, a width of 0.02 mm ⁇ b ⁇ 0.05 mm and groove walls which are around 0 ° ⁇ ⁇ 10 ° are inclined outwards. The cross section of such a groove is thus trapezoidal.
  • the grooves of the invention are smaller and also steeper than previous surface texture forming grooves and cause the mold during the casting process can be optimally vented, but the casting metal does not penetrate into the grooves and hooked there undercut.
  • the surface texture according to the invention is freely designable, but care must be taken that the individual grooves can be vented.
  • the surface texture can be used with or without protective gas and with or without size or with or without continuous coating and also in combination of permanent coating and size. Of particular advantage in the surface texture according to the invention with the grooves described above is that this creates a surface texture with a design that is difficult to imitate, which can serve as a proof of origin.
  • the grooves form a quadrilateral structure.
  • a quadrilateral structure can be, for example, a rectangular structure or a rhombic structure, which are also referred to in particular as a so-called waffle pattern, and which allow the cast blank to be removed from the casting mold in almost all directions, that is to say almost parallel to the surface.
  • the grooves are introduced by means of a laser.
  • the production of such grooves and indirectly also of such surface textures by means of lasers represents a cost-effective and at the same time high-quality production method.
  • a coating in particular a size, is applied to the surface texture.
  • Such a coating can at least partially narrow the groove at its entrance and thereby make penetration of the casting material more difficult.
  • there is no closing of the individual grooves due to the coating so that the air removal can also be ensured with coating, in particular continuous coating or sizing.
  • coating in particular continuous coating or sizing.
  • FIG. 1 shows a casting mold 1 according to the invention for casting a piston 2 shown only in regions (cf. FIG. 3 ) of an internal combustion engine in the region of a later inner surface 3 of a piston skirt a surface texture 5 formed by grooves 4.
  • the grooves 4 have the following dimensions according to the invention: A depth t, which is between 0.2 mm and 0.5 mm (see FIG. 2 ), a width b which is between 0.02 mm and 0.05 mm and outwardly inclined groove walls 6, wherein an inclination of the Nutennch 6 outwardly between 0 ° ⁇ ⁇ 10 °.
  • the casting mold according to the invention no longer has this disadvantage, since in this case the surface texture 5 is designed such that the casting material can not penetrate into the surface texture 5, that is to say in particular not into the grooves 4 and thereby leaves a great deal of freedom with respect to the demoulding direction no undercuts are generated. Nevertheless, the grooves 4 according to the invention or the surface texture 5 produced thereby also make it possible to improve the flowability and the air removal during the casting process of the piston 2.
  • the grooves 4 form a quadrangular structure, for example a square waffle pattern or else a rhombic structure.
  • a distance a which is between 0.2 mm and 2.0 mm.
  • An introduction of the grooves 4 and thus the surface texture 5 in the mold 1 can be done for example by means of laser, whereby the grooves 4 can be introduced not only extremely accurate, but also relatively inexpensive.
  • a special feature of the surface texture 5 makes it possible to create a mark of origin, whereby the piston 2 cast with the casting mold 1 according to the invention is unequivocally and easily attributable to a particular manufacturer.
  • the casting mold 1 in the area of the surface texture 5 can also have a coating 8, in particular a size.
  • a coating 8 or sizing is generally understood coating materials that are applied, for example, to molds 1, in particular to smooth a porous molding surface.
  • Such a coating 8 or sizing additionally insulates the substrate and protects it against the thermal stress of the molten metal during the casting of the piston 2.
  • the surface texture 5 or the grooves 4 forming these can be introduced, for example, with or without protective gas.
  • the grooves 4 according to the invention are smaller and steeper than grooves of previous surface textures, whereby ingress of the melt during the casting process and thereby the formation of undesirable undercuts can at least be reduced, preferably even avoided, but the ventilation required for optimum casting can be reliably ensured ,

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (7)

  1. Moule de coulée (1) servant à couler un piston (2) d'un moteur à combustion interne, dans lequel le moule de coulée (1) présente, dans la zone d'une surface intérieure (3) ultérieure d'une jupe de piston, une texture de surface (5) formée par des rainures (4) et dans lequel les rainures (4) présentent les dimensions qui suivent,
    - une profondeur de 0,2 mm < p < 0,5 mm,
    - une largeur de 0,02 mm < l < 0,05 mm, ainsi que
    - des parois de rainure (6), qui sont inclinées vers l'extérieur à 0° < α < 10°.
  2. Moule de coulée selon la revendication 1,
    caractérisé en ce
    que les rainures (4) forment une structure quadrangulaire.
  3. Moule de coulée selon la revendication 1 ou 2,
    caractérisé en ce
    qu'une distance d'environ 0,2 mm < d < 2,0 mm se situe entre deux rainures (4).
  4. Moule de coulée selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce
    que les rainures (4) sont pratiquées au moyen d'un laser.
  5. Moule de coulée selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce
    qu'un revêtement (8), en particulier un enduit, est appliqué sur la texture de surface (5).
  6. Moule de coulée selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce
    que la texture de surface (5) est réalisée sous la forme d'un motif gaufré carré.
  7. Piston (2) coulé dans un moule de coulée (1) selon l'une quelconque des revendications 1 à 6, avec une texture de surface (5) formée par des rainures (4) dans la zone d'une surface intérieure (3) de la jupe de piston, dans lequel les rainures (4) présentent les dimensions qui suivent,
    - une profondeur de 0,2 mm < p < 0,5 mm,
    - une largeur de 0,02 mm < l < 0,05 mm, ainsi que
    - des parois de rainure (6), qui sont inclinées vers l'extérieur à 0° < α < 10°.
EP14780430.6A 2013-10-08 2014-09-23 Moule de coulée et piston fabriqué au moyen de celui-ci Active EP3055088B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14780430T PL3055088T3 (pl) 2013-10-08 2014-09-23 Forma odlewnicza i wytwarzany w niej tłok

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013220256.3A DE102013220256A1 (de) 2013-10-08 2013-10-08 Gießform
PCT/EP2014/070166 WO2015051991A1 (fr) 2013-10-08 2014-09-23 Moule de coulée et piston fabriqué au moyen de celui-ci

Publications (2)

Publication Number Publication Date
EP3055088A1 EP3055088A1 (fr) 2016-08-17
EP3055088B1 true EP3055088B1 (fr) 2017-08-30

Family

ID=51659615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14780430.6A Active EP3055088B1 (fr) 2013-10-08 2014-09-23 Moule de coulée et piston fabriqué au moyen de celui-ci

Country Status (8)

Country Link
US (1) US10391552B2 (fr)
EP (1) EP3055088B1 (fr)
JP (1) JP6538034B2 (fr)
CN (1) CN105555434B (fr)
BR (1) BR112016007400B1 (fr)
DE (1) DE102013220256A1 (fr)
PL (1) PL3055088T3 (fr)
WO (1) WO2015051991A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015219895A1 (de) 2015-10-14 2017-04-20 Ford Global Technologies, Llc Direkteinspritzende Brennkraftmaschine mit Kolben und Verfahren zur Herstellung eines Kolbens einer derartigen Brennkraftmaschine
DE102017206922B3 (de) 2017-04-25 2018-08-23 Federal-Mogul Nürnberg GmbH Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor, Kolben, Kolbenrohling sowie Gießform
CN114458715B (zh) * 2022-01-14 2023-03-24 清华大学 基于表面织构的磁流变阻尼器

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GB1342245A (fr) * 1970-05-14 1974-01-03 Hepworth & Grandage Ltd
JPS5232817A (en) * 1975-09-08 1977-03-12 Nippon Steel Corp Molten substance solidifying mold or vessel having notch in molten substance contact surface
US4250950A (en) * 1978-11-03 1981-02-17 Swiss Aluminium Ltd. Mould with roughened surface for casting metals
JPS63256251A (ja) * 1987-04-13 1988-10-24 Toyota Motor Corp ダイカストにおける鋳造欠陥の防止方法
IT1250214B (it) * 1991-11-22 1995-04-03 Rivestimento al nitruro di titanio per conchiglie per pistoni.
JP3388945B2 (ja) * 1995-05-23 2003-03-24 新日本製鐵株式会社 連続鋳造用鋳型の作製方法
US5857440A (en) * 1996-06-07 1999-01-12 Melco Engraving, Inc. Engine piston and method for its manufacture
JPH10137895A (ja) * 1996-11-11 1998-05-26 Nissan Motor Co Ltd 鋳造用金型及び鋳造方法
JP3380412B2 (ja) * 1997-01-07 2003-02-24 新日本製鐵株式会社 溶鋼の連続鋳造用鋳型
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Also Published As

Publication number Publication date
DE102013220256A1 (de) 2015-04-09
JP6538034B2 (ja) 2019-07-03
JP2016535829A (ja) 2016-11-17
CN105555434A (zh) 2016-05-04
BR112016007400B1 (pt) 2020-12-08
CN105555434B (zh) 2017-11-14
BR112016007400A2 (pt) 2017-08-01
US20160236273A1 (en) 2016-08-18
PL3055088T3 (pl) 2018-03-30
EP3055088A1 (fr) 2016-08-17
WO2015051991A1 (fr) 2015-04-16
US10391552B2 (en) 2019-08-27

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