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WO2018114223A1 - Procédé de fabrication par forgage d'un piston monobloc pour moteur à combustion interne et piston ainsi fabriqué - Google Patents

Procédé de fabrication par forgage d'un piston monobloc pour moteur à combustion interne et piston ainsi fabriqué Download PDF

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Publication number
WO2018114223A1
WO2018114223A1 PCT/EP2017/080383 EP2017080383W WO2018114223A1 WO 2018114223 A1 WO2018114223 A1 WO 2018114223A1 EP 2017080383 W EP2017080383 W EP 2017080383W WO 2018114223 A1 WO2018114223 A1 WO 2018114223A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
cooling channel
section
opening
forged
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.)
Ceased
Application number
PCT/EP2017/080383
Other languages
German (de)
English (en)
Inventor
Timo Linke
Rainer Scharp
Matthias Seifried
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
Publication of WO2018114223A1 publication Critical patent/WO2018114223A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/18—Making machine elements pistons or plungers
    • B21K1/185—Making machine elements pistons or plungers with cooling channels
    • 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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • 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 method of manufacturing a one-piece piston for an internal combustion engine by forging.
  • the invention also relates to a piston produced by this method.
  • Steel pistons can be produced, for example, by forging, wherein after completion of the forging process a circumferential cooling channel is introduced by a machining from below.
  • this machining not only increases the cycle time, but also the cycle time
  • the present invention therefore addresses the problem of providing a method for producing a one-piece piston for an internal combustion engine by means of forging, which no longer has the disadvantages known from the prior art.
  • the present invention is based on the general idea, for the first time in a forged, one-piece piston to forge a cooling channel at least in some areas, whereby the previously required for the production of such a piston rotation process for introducing the cooling channel omitted, or at least can be greatly reduced.
  • the piston produced by the method according to the invention has a
  • Piston head with a ring section and an integrally formed with the piston head piston skirt.
  • a piston channel is provided in the piston head, that is, usually open towards the bottom and at least partially encircling cooling channel.
  • at least two pockets interrupted in the circumferential direction by an at least equal number of webs and open toward the piston skirt are then forged, which form the later cooling channel.
  • the individual bags are in
  • Made bags which eliminates the hitherto required machining and the entire manufacturing process can be significantly streamlined and reduced in terms of its cost.
  • at least two pockets are formed during forging, resulting in two webs interrupting the respective pockets in the circumferential direction.
  • a bag forming or forming the later cooling channel is produced by a punch pressed in from below while forging. As this is in the area of Box walls, for example, is not possible, usually webs are arranged there. It is thus possible for the first time with the method according to the invention
  • Methods are forged at least four in the circumferential direction by an at least equal number of webs interrupted and open towards the piston skirt pockets that form the later cooling channel. At four in
  • the cooling channel is reworked exclusively in the area of the support surface, but otherwise remains unprocessed.
  • Combustion chamber or the piston head pointing towards the area of the cooling channel thus remains completely unprocessed and thereby has compared to a machining production of the cooling channel a forging own and greater surface roughness in the region of the cooling channel, whereby a larger surface is available for heat exchange and thus a piston produced by the process according to the invention can additionally effect a better cooling of the heavily loaded areas, such as, for example, a combustion chamber trough and a top land.
  • a piston produced by the process according to the invention can additionally effect a better cooling of the heavily loaded areas, such as, for example, a combustion chamber trough and a top land.
  • At least one cooling channel cover is attached, wherein the breakthrough is made in at least one web such that a remaining there between the piston and the cooling channel cover cross-section at least half as large as a cross section of an inlet opening in the
  • Cooling channel In this way, a sufficient flow of the cooling medium, for example. Oil, between two adjacent pockets and thus ensuring a cooling capacity can be guaranteed.
  • the present invention is further based on the general idea of a one-piece forged piston according to the method described above
  • an axial height of at least one aperture is at least 10% of an axial height of the cooling channel at its highest point.
  • the cooling channel at least partially extends up to a second annular groove.
  • the cooling channel is thus pulled so far upwards in terms of its axial height, that the temperature-critical areas of the piston, such as, for example, land, ring and / or
  • Combustion bowl can be cooled reliably. A sufficient amount
  • Cooling of the aforementioned, temperature-critical regions of the piston is essential for a high functional reliability of the piston and a long life thereof.
  • Fig. 1 is a sectional view through a means of a
  • Fig. 2 is a sectional view taken along the section plane B-B through the
  • Fig. 3 is a sectional view through the according to the invention
  • FIGS. 1 and 3 one according to the invention
  • piston 1 illustrated in FIGS. 1 to 3 is now produced as follows: First, a piston blank is inserted into a corresponding one
  • Forged tool (not shown) inserted and then made the piston 1 by forging. At the same time at least two in
  • Circumferential direction 6 (see Fig. 2) interrupted by an at least equal number of webs 7 and the piston shaft 4 out, that is in the present case according to FIGS. 1 and 3 downwardly open pockets 9 forged, which form the later cooling channel 8 ,
  • a chisel an at least partially encircling support surface 1 1 for a cooling channel cover 12th
  • At least two pockets 9 are introduced by forging, but it is also conceivable that at an increased required rigidity of the piston 1, a web 7, z. For example, behind so located radially inward, can remain to a tread 14 (see left pockets 9 and web 7 in FIG.
  • Secondary movement can be influenced.
  • a cross section of the opening 13 is at least half as large as a cross section of an inlet opening.
  • An axial height h of at least one opening 13 amounts to at least 10% of an axial height H of the cooling channel 8 at its highest point, as shown for example in FIG. 1. This is also to ensure that that the cross section of the opening 13 is so large that a reliable circulation of cooling medium, for example. Oil, in the cooling channel 8 between two
  • the axial height H of the cooling channel 8 extends at least partially up to a second annular groove 16a to both the ring section 3 and the combustion bowl 5 of the piston 1, that is, the temperature-critical areas of the piston 1 to be able to cool reliably.
  • a forged piston 1 can be produced inexpensively and with relatively low cycle time, since the cooling channel 8 in the form of at least two interrupted in the circumferential direction by webs 7 pockets 9 already forged and therefore not subsequently introduced by a machining operation got to.
  • the piston 1 according to the invention can thus be offered more cost-effectively as a forged piston 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne un procédé de fabrication par forgeage d'un piston monobloc (1) destiné à un moteur à combustion interne, comprenant un arbre de piston (4) formé d'une seule pièce avec une tête de piston (2). Dans la tête de piston (2) est prévu un canal de refroidissement (8) au moins partiellement périphérique, qui est ouvert en direction de l'arbre de piston (4) et dans lequel sont formées par forgeage au moins deux poches (9) ouvertes en direction de l'arbre de piston (4) et interrompues dans la direction circonférentielle (6) par au moins un même nombre de nervures (7), lesquelles poches forment le canal de refroidissement ultérieur (8), puis est ménagée une surface d'appui (11) au moins partiellement périphérique destinée à un capot de canal de refroidissement (12). Un passage (13) est ménagé dans au moins une nervure (7) et ainsi une liaison fluidique est établie entre au moins deux poches adjacentes (9). L'invention concerne également un piston forgé monobloc ainsi réalisé.
PCT/EP2017/080383 2016-12-20 2017-11-24 Procédé de fabrication par forgage d'un piston monobloc pour moteur à combustion interne et piston ainsi fabriqué Ceased WO2018114223A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016225637.8 2016-12-20
DE102016225637.8A DE102016225637A1 (de) 2016-12-20 2016-12-20 Verfahren zum Herstellen eines einteiligen Kolbens für einen Verbrennungsmotor durch Schmieden

Publications (1)

Publication Number Publication Date
WO2018114223A1 true WO2018114223A1 (fr) 2018-06-28

Family

ID=60888353

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/080383 Ceased WO2018114223A1 (fr) 2016-12-20 2017-11-24 Procédé de fabrication par forgage d'un piston monobloc pour moteur à combustion interne et piston ainsi fabriqué

Country Status (2)

Country Link
DE (1) DE102016225637A1 (fr)
WO (1) WO2018114223A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018209267A1 (de) * 2018-06-11 2019-12-12 Federal-Mogul Nürnberg GmbH Kolben für Verbrennungsmotoren und Verwendung eines Kolbens für Verbrennungsmotoren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996020340A1 (fr) * 1994-12-24 1996-07-04 Mahle Gmbh Procede de production d'un piston monobloc a canal de refroidissements
DE102006027810A1 (de) * 2006-06-16 2007-12-20 Mahle International Gmbh Verfahren zur Herstellung eines einteiligen Kolbens sowie damit hergestellter Kolben
DE102006045728A1 (de) 2006-09-27 2008-04-03 Mahle International Gmbh Einteiliger Kolben für einen Verbrennungsmotor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013395C1 (de) * 2000-03-17 2001-08-02 Ks Kolbenschmidt Gmbh Verfahren zur Herstellung eines einteiligen Kühlkanalkolbens, insbesondere für einen Dieselmotor, sowie ein danach hergestellter einteiliger Kühlkanalkolben
DE10244513A1 (de) * 2002-09-25 2004-04-08 Mahle Gmbh Mehrteiliger gekühlter Kolben für einen Verbrennungsmotor und Verfahren zu dessen Herstellung
DE10244510A1 (de) * 2002-09-25 2004-04-08 Mahle Gmbh Einteiliger Kühlkanalkolben für einen Verbrennungsmotor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996020340A1 (fr) * 1994-12-24 1996-07-04 Mahle Gmbh Procede de production d'un piston monobloc a canal de refroidissements
DE102006027810A1 (de) * 2006-06-16 2007-12-20 Mahle International Gmbh Verfahren zur Herstellung eines einteiligen Kolbens sowie damit hergestellter Kolben
DE102006045728A1 (de) 2006-09-27 2008-04-03 Mahle International Gmbh Einteiliger Kolben für einen Verbrennungsmotor

Also Published As

Publication number Publication date
DE102016225637A1 (de) 2018-06-21

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