WO2013004214A1 - Method for producing a piston for an internal combustion engine - Google Patents

Method for producing a piston for an internal combustion engine Download PDF

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Publication number
WO2013004214A1
WO2013004214A1 PCT/DE2012/000669 DE2012000669W WO2013004214A1 WO 2013004214 A1 WO2013004214 A1 WO 2013004214A1 DE 2012000669 W DE2012000669 W DE 2012000669W WO 2013004214 A1 WO2013004214 A1 WO 2013004214A1
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WO
WIPO (PCT)
Prior art keywords
salt core
ring carrier
piston
blank
core
Prior art date
Application number
PCT/DE2012/000669
Other languages
German (de)
French (fr)
Inventor
Helmut Kollotzek
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 WO2013004214A1 publication Critical patent/WO2013004214A1/en

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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
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B22C21/12—Accessories
    • B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/18—Finishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B22D19/0027—Cylinders, pistons 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 
    • F02F3/16—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

Definitions

  • the invention relates to a method for producing a piston for an internal combustion engine according to the preamble of claim 1.
  • a piston with a ring carrier and a cooling channel arranged radially inside the ring carrier, wherein the cooling channel is produced using a soluble core is known from German Patent DE 102 18 999.
  • the melt must overcome a large flow resistance during casting of the piston to flow through the space between the core and ring carrier, which involves the risk that the ring carrier is not completely encircled, and thus an intact ring carrier bond is no longer guaranteed.
  • the salt core for producing the cooling channel radially outside spacer ribs, which is held despite possible casting tolerances of the salt core in the mold of the salt core always at a distance from the ring carrier, so that between the salt core and the ring carrier always a sufficiently large distributed over the circumference Gap results, through which the melt flow during the casting of the piston without resistance and thus can flow around the ring carrier.
  • FIG. 1 shows a section through the head of a piston blank with a ring carrier and a salt core
  • Fig. 3 is a pressed salt core blank
  • FIG. 1 shows a section through the head of a blank of a piston 1 for an internal combustion engine, which has the blank of a ring carrier 3 in the radial direction near the bottom of the piston 2.
  • a salt core 4 is arranged, which is connected in the blank of the piston 1 with the sleeves 5 and 5 ', via which the salt core 4 is fixed in the mold for the piston 1.
  • the gap 7 'forming in this case has a size of at least 0.1 mm and is shown enlarged in FIGS. 1 and 2.
  • the aim is to secure the salt core in the mold so that between all spacer ribs 6a to 6e (Fig. 2) and the ring carrier 3, the gap 7 'is the same size.
  • the spacer rib 6 in question has the task of keeping the salt core 4 at a distance from the ring carrier 3, which results in a circumferentially distributed, sufficiently large gap 7, which ensures that during casting of the piston 1, the melt unhindered between ring carrier 3 and salt core 4 can pass, so that even in the area in which a spacer rib 6 the ring carrier 3 tan- giert, a sufficiently large gap 7 of at least 2.5 mm remains, which ensures that even in this critical area of the ring carrier 3 is surrounded.
  • the piston can be cast from aluminum or steel.
  • a dashed ring groove 8 is screwed into the ring carrier 3, the sleeves 5, 5 'are removed from the piston blank and is washed out of the piston 1 via the resulting channels 9, 9' of the salt core 4, so that instead of the salt core 4, a closed cooling channel 10 results.
  • oil is fed into and out of the cooling channel 10 via the channels 9, 9 '.
  • Fig. 2 shows the ring carrier blank 3 and the salt core 4 in plan view, as they are arranged in the mold, with spacer ribs 6a to 6e, which are evenly distributed over the circumference, are kept at a distance from the ring carrier 3 and thereby ensure that as well at critical mounting conditions, the gap 7 between ring carrier 3 and salt core 4 has a sufficient width over the circumference.
  • the gap 7 has a width of 2 to 3 mm. This ensures that the melt flows freely between ring carrier 3 and salt core 4 and the ring carrier
  • all spacer ribs 6a to 6e are arranged at a distance from the ring carrier 3. Because of Piniolen 5, 5 'for holding the salt core
  • the spacer ribs 6a to 6e for fixing the salt core 4 are not required.
  • the spacer ribs 6a to 6e ensure only that the gap 7 between ring carrier 3 and salt core 4 is sufficiently large over the circumference and not less than 2.5 mm, when the salt core 4 is moved in one direction.
  • Fig. 3 shows a blank of the salt core 4 with the spacer ribs 6a to 6e, which is produced by pressing.
  • the spacer ribs 6a to 6e production due to the same axial length as the salt core blank.
  • the salt core 4 shown in Fig. 4 results after the reduction of the axial length of the salt core 4 and in particular after the reduction of the axial length of the spacer ribs 6a to 6e.
  • This finishing of the salt core is done by turning, wherein the thereby machined surfaces 12, 12 'in Fig. 4 are drawn in black.

Abstract

A method is proposed for producing a piston (1) for an internal combustion engine, comprising a ring carrier (3), arranged radially outside near the piston head (2), and comprising a cooling duct (10), arranged radially inside the ring carrier (3), wherein the cooling duct (10) is produced using a salt core (4). This involves producing a blank of the salt core (4') by pressing, wherein at least three spacing ribs (6a to 6e) that are distributed uniformly over the circumference of the salt core (4) are formed onto the radial outer surface of the salt core (4). A blank of the ring carrier (3) and the salt core (4) are fastened in the casting mould by means of mandrels (5, 5') in such a way that the salt core (4) is kept at a distance from the blank of the ring carrier (3) by the spacing ribs (6a to 6e). Subsequently, molten material is poured into the casting mould, and the piston (1) is completed by means of machining operations.

Description

Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor  Method for producing a piston for an internal combustion engine
Die Erfindung betrifft ein Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor nach dem Oberbegriff des Anspruches 1. The invention relates to a method for producing a piston for an internal combustion engine according to the preamble of claim 1.
Ein Kolben mit einem Ringträger und mit einem radial innerhalb des Ringträgers angeordneten Kühlkanal, wobei der Kühlkanal unter Verwendung eines löslichen Kerns hergestellt wird, ist aus dem Deutschen Patent DE 102 18 999 bekannt. Der Kern, womit der Kühlkanal hergestellt wird und damit auch der Kühlkanal weisen hierbei wellenförmige Ausbuchtungen auf, die koaxial an den Ringträger grenzen uns diesen berühren. Beim Gießen des Kolbens unter Verwendung des wellenförmig ausgebildeten Kerns ergibt sich hierbei der Nachteil, dass nur wenig Raum zwischen dem Kern und dem Ringträger bleibt. Hierdurch muss die Schmelze beim Gießen des Kolbens einen großen Fließwiderstand überwinden, um durch den Raum zwischen Kern und Ringträger zu fließen, was die Gefahr mit sich bringt, dass der Ringträger nicht vollständig umgössen wird, und damit eine intakte Ringträgerbindung nicht mehr gewährleistet ist. A piston with a ring carrier and a cooling channel arranged radially inside the ring carrier, wherein the cooling channel is produced using a soluble core, is known from German Patent DE 102 18 999. The core, with which the cooling channel is produced and thus also the cooling channel in this case have wave-shaped bulges, the coaxial with the ring carrier boundaries touch us. When casting the piston using the corrugated core results in this case the disadvantage that only little space between the core and the ring carrier remains. As a result, the melt must overcome a large flow resistance during casting of the piston to flow through the space between the core and ring carrier, which involves the risk that the ring carrier is not completely encircled, and thus an intact ring carrier bond is no longer guaranteed.
Diesen Nachteil des Standes der Technik zu vermeiden ist Aufgabe der vorliegenden Erfindung. To avoid this disadvantage of the prior art is the object of the present invention.
Gelöst wird die Aufgabe mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen. The problem is solved with the features in the characterizing part of the main claim.
Hierbei weist der Salzkern zur Herstellung des Kühlkanals radial außen Distanzrippen auf, wodurch trotz möglicher gießtechnischer Lagetoleranzen des Salzkerns in der Gießform der Salzkern immer auf Abstand zum Ringträger gehalten wird, sodass sich zwischen dem Salzkern und dem Ringträger auch immer ein ausreichend großer über den Umfang verteilter Spalt ergibt, durch den beim Gießen des Kolbens die Schmelze ohne Widerstand fließen und damit den Ringträger umfließen kann. Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnungen beschrieben. Es zeigen Here, the salt core for producing the cooling channel radially outside spacer ribs, which is held despite possible casting tolerances of the salt core in the mold of the salt core always at a distance from the ring carrier, so that between the salt core and the ring carrier always a sufficiently large distributed over the circumference Gap results, through which the melt flow during the casting of the piston without resistance and thus can flow around the ring carrier. An embodiment of the invention will be described below with reference to the drawings. Show it
Fig. 1 einen Schnitt durch den Kopf eines Kolbenrohlings mit einem Ringträger und einem Salzkern, 1 shows a section through the head of a piston blank with a ring carrier and a salt core,
Fig. 2 den Ringträger und den Salzkern in Draufsicht, wie sie in der Gießform angeordnet sind, 2 shows the ring carrier and the salt core in plan view, as they are arranged in the mold,
Fig. 3 einen gepressten Salzkernrohling und Fig. 3 is a pressed salt core blank and
Fig. 4 den Salzkern nach der Fertigbearbeitung. 4 shows the salt core after finishing.
Fig. 1 zeigt einen Schnitt durch den Kopf eines Rohlings eines Kolbens 1 für einen Verbrennungsmotor, der nahe dem Kolbenboden 2 radial außen den Rohling eines Ringträgers 3 aufweist. Radial innerhalb des Ringträgers 3 ist ein Salzkern 4 angeordnet, der im Rohling des Kolbens 1 mit den Pinolen 5 und 5' verbunden ist, über die der Salzkern 4 in der Gießform für den Kolben 1 befestigt ist. 1 shows a section through the head of a blank of a piston 1 for an internal combustion engine, which has the blank of a ring carrier 3 in the radial direction near the bottom of the piston 2. Radially inside the ring carrier 3, a salt core 4 is arranged, which is connected in the blank of the piston 1 with the sleeves 5 and 5 ', via which the salt core 4 is fixed in the mold for the piston 1.
Erkennbar ist in Fig. 1 eine Distanzrippe 6, die radial außen an den Salzkern 4 angeformt ist, und die einen Abstand 7' vom Ringträger 3 aufweist. Der sich hierbei bildende Spalt 7' weist eine Größe von mindestens 0,1 mm auf und ist in Fig. 1 und Fig. 2 vergrößert eingezeichnet. Angestrebt wird, den Salzkern so in der Gießform zu befestigen, dass zwischen allen Distanzrippen 6a bis 6e (Fig. 2) und dem Ringträger 3 der Spalt 7' gleich groß ist. It can be seen in Fig. 1, a spacer rib 6, which is integrally formed radially on the outside of the salt core 4, and which has a distance 7 'from the ring carrier 3. The gap 7 'forming in this case has a size of at least 0.1 mm and is shown enlarged in FIGS. 1 and 2. The aim is to secure the salt core in the mold so that between all spacer ribs 6a to 6e (Fig. 2) and the ring carrier 3, the gap 7 'is the same size.
Es kann aber wegen gießtechnisch bedingter Lagetoleranzen des Gießkerns 4 in der Gießform dazu kommen, dass eine Distanzrippe 6 in Kontakt mit dem Ringträger 3 kommt. In so einem Fall hat die betreffende Distanzrippe 6 die Aufgabe, den Salzkern 4 auf Distanz zum Ringträger 3 zu halten, wobei sich ein über den Umfang verteilter, ausreichend großer Spalt 7 ergibt, der dafür sorgt, dass beim Gießen des Kolbens 1 die Schmelze ungehindert zwischen Ringträger 3 und Salzkern 4 gelangen kann, sodass auch in dem Bereich, in dem eine Distanzrippe 6 den Ringträger 3 tan- giert, ein ausreichend großer Spalt 7 von mindestens 2,5 mm bleibt, der gewährleistet, dass auch in diesem kritischen Bereich der Ringträger 3 umgössen wird. Hierbei kann der Kolben aus Aluminium oder aus Stahl gegossen werden. However, because of casting-related positional tolerances of the casting core 4 in the casting mold, it may happen that a spacer rib 6 comes into contact with the ring carrier 3. In such a case, the spacer rib 6 in question has the task of keeping the salt core 4 at a distance from the ring carrier 3, which results in a circumferentially distributed, sufficiently large gap 7, which ensures that during casting of the piston 1, the melt unhindered between ring carrier 3 and salt core 4 can pass, so that even in the area in which a spacer rib 6 the ring carrier 3 tan- giert, a sufficiently large gap 7 of at least 2.5 mm remains, which ensures that even in this critical area of the ring carrier 3 is surrounded. Here, the piston can be cast from aluminum or steel.
Im Rahmen der Fertigstellung des Kolbens 1 wird in den Ringträger 3 eine gestrichelt eingezeichnete Ringnut 8 eingedreht, werden die Pinolen 5, 5' aus dem Kolbenrohling entfernt und wird über die dabei entstehenden Kanäle 9, 9' der Salzkern 4 aus dem Kolben 1 ausgewaschen, sodass sich anstelle des Salzkern 4 ein geschlossenes Kühlkanal 10 ergibt. Im Motorbetrieb wird über die Kanäle 9, 9' Öl in den Kühlkanal 10 ein- und wieder ausgeleitet. As part of the completion of the piston 1, a dashed ring groove 8 is screwed into the ring carrier 3, the sleeves 5, 5 'are removed from the piston blank and is washed out of the piston 1 via the resulting channels 9, 9' of the salt core 4, so that instead of the salt core 4, a closed cooling channel 10 results. When the engine is running, oil is fed into and out of the cooling channel 10 via the channels 9, 9 '.
Fig. 2 zeigt den Ringträgerrohling 3 und den Salzkern 4 in Draufsicht, wie sie in der Gießform angeordnet sind, mit Distanzrippen 6a bis 6e, die gleichmäßig über den Umfang verteilt sind, auf Abstand zum Ringträger 3 gehalten sind und dadurch dafür sorgen, dass auch bei kritischen Montagebedingungen der Spalt 7 zwischen Ringträger 3 und Salzkern 4 über den Umfang eine ausreichende Breite hat. Der Spalt 7 hat eine Breite von 2 bis 3 mm. Hierdurch ist gewährleistet, dass die Schmelze ungehindert zwischen Ringträger 3 und Salzkern 4 hindurchfließen und den RingträgerFig. 2 shows the ring carrier blank 3 and the salt core 4 in plan view, as they are arranged in the mold, with spacer ribs 6a to 6e, which are evenly distributed over the circumference, are kept at a distance from the ring carrier 3 and thereby ensure that as well at critical mounting conditions, the gap 7 between ring carrier 3 and salt core 4 has a sufficient width over the circumference. The gap 7 has a width of 2 to 3 mm. This ensures that the melt flows freely between ring carrier 3 and salt core 4 and the ring carrier
3 umgießen kann. 3 can transfuse.
Im vorliegenden Ausführungsbeispiel sind alle Distanzrippen 6a bis 6e auf Abstand zum Ringträger 3 angeordnet. Wegen der Piniolen 5, 5' zur Halterung des SalzkernsIn the present embodiment, all spacer ribs 6a to 6e are arranged at a distance from the ring carrier 3. Because of Piniolen 5, 5 'for holding the salt core
4 in der Gießform sind die Distanzrippen 6a bis 6e zur Fixierung des Salzkerns 4 nicht erforderlich. Die Distanzrippen 6a bis 6e sorgen ausschließlich dafür, dass der Spalt 7 zwischen Ringträger 3 und Salzkern 4 über den Umfang ausreichend groß ist und nicht kleiner als 2,5 mm wird, wenn der Salzkern 4 in eine Richtung verschoben wird. 4 in the mold, the spacer ribs 6a to 6e for fixing the salt core 4 are not required. The spacer ribs 6a to 6e ensure only that the gap 7 between ring carrier 3 and salt core 4 is sufficiently large over the circumference and not less than 2.5 mm, when the salt core 4 is moved in one direction.
Fig. 3 zeigt einen Rohling des Salzkerns 4 mit den Distanzrippen 6a bis 6e, der durch Pressen hergestellt wird. Hierbei haben die Distanzrippen 6a bis 6e fertigungsbedingt die gleiche axiale Länge wie der Salzkernrohling 4. Der in Fig. 4 dargestellte Salzkern 4 ergibt sich nach der Reduzierung der axialen Länge des Salzkerns 4 und insbesondere nach der Verringerung der axialen Länge der Distanzrippen 6a bis 6e. Diese Fertigbearbeitung des Salzkerns erfolgt durch Drehen, wobei die hierdurch bearbeiteten Flächen 12, 12' in Fig. 4 schwarz gezeichnet sind. Fig. 3 shows a blank of the salt core 4 with the spacer ribs 6a to 6e, which is produced by pressing. Here, the spacer ribs 6a to 6e production due to the same axial length as the salt core blank. 4 The salt core 4 shown in Fig. 4 results after the reduction of the axial length of the salt core 4 and in particular after the reduction of the axial length of the spacer ribs 6a to 6e. This finishing of the salt core is done by turning, wherein the thereby machined surfaces 12, 12 'in Fig. 4 are drawn in black.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Kolben 1 piston
2 Kolbenboden  2 piston bottom
3 Ringträger  3 ring bearers
4 Salzkern  4 salt core
5, 5' Pinole  5, 5 'quill
6a bis 6e Distanzrippe  6a to 6e spacer rib
7, 7' Spalt  7, 7 'gap
8 Ringnut  8 ring groove
9, 9' Kanal  9, 9 'channel
10 Kühlkanal  10 cooling channel
12, 12' Fläche des Salzkerns 4  12, 12 'area of the salt core 4

Claims

Patentanspruch claim
1. Verfahren zur Herstellung eines Kolbens (1) für einen Verbrennungsmotor mit einem nahe dem Kolbenboden (2) radial außen angeordneten Ringträger (3) und mit einem radial innerhalb des Ringträgers (3) angeordneten Kühlkanal (10), wobei der Kühlkanal (10) unter Verwendung eines Salzkerns (4) hergestellt wird, gekennzeichnet durch die folgenden Verfahrensschritte: 1. A method for producing a piston (1) for an internal combustion engine with a near the piston head (2) radially outwardly arranged ring carrier (3) and with a radially inside the ring carrier (3) arranged cooling channel (10), wherein the cooling channel (10) using a salt core (4), characterized by the following process steps:
- Herstellen eines Rohlings des Salzkerns (4) durch Pressen, wobei an die radiale Außenfläche des Salzkerns (4) mindestens drei, gleichmäßig über den Umfang des Salzkerns (4) verteilte Distanzrippen (6a bis 6e) angeformt werden,  - Producing a blank of the salt core (4) by pressing, wherein on the radial outer surface of the salt core (4) at least three, uniformly over the circumference of the salt core (4) distributed spacer ribs (6a to 6e) are formed,
- Fertigstellen des Salzkerns (4) durch Drehen, wobei die axiale Länge des Salzkerns (4) und der Distanzrippen (6a bis 6e) verringert werden,  - Finishing of the salt core (4) by turning, wherein the axial length of the salt core (4) and the spacer ribs (6a to 6e) are reduced,
- Befestigung eines Rohlings des Ringträgers (3) in einer Gießform für den Kolben (1),  - Fixing a blank of the ring carrier (3) in a mold for the piston (1),
- Befestigung des Salzkerns (4) in der Gießform mittels Pinolen (5, 5') derart, dass zwischen allen Distanzrippen (6a bis 6e) und dem Ringträger (3) ein Abstand von mindestens 0,1 mm eingehalten wird, und dass sich dabei ein Spalt (7) von 2 bis 3 mm, mindestens jedoch von 1 mm zwischen dem Salzkern (4) und dem Rohling des Ringträgers (3) ergibt,  - Attachment of the salt core (4) in the mold by means of sleeves (5, 5 ') such that between all spacer ribs (6a to 6e) and the ring carrier (3) a distance of at least 0.1 mm is maintained, and that thereby a gap (7) of 2 to 3 mm, but at least 1 mm between the salt core (4) and the blank of the ring carrier (3),
- Gießen von Schmelze in die Gießform, wobei der Spalt (7) mit Schmelze ausgefüllt wird,  Pouring melt into the casting mold, wherein the gap (7) is filled with melt,
- Eindrehen einer Ringnut (8) in den Rohling des Ringträgers (3),  - Screwing an annular groove (8) in the blank of the ring carrier (3),
- Entfernen der Pinolen (5, 5') aus der Gießform zur Bildung von Kanälen (9, 9') zwischen dem Salzkern (4) und der axial unteren Außenfläche des Kolbenrohlings,  Removing the sleeves (5, 5 ') from the casting mold to form channels (9, 9') between the salt core (4) and the axially lower outer surface of the piston blank,
- Auswaschen des Salzkerns (4) über die Kanäle (9, 9') zur Bildung eines Kühlkanals (10),  Washing out the salt core (4) via the channels (9, 9 ') to form a cooling channel (10),
- Fertigstellen des Kolbens (1) durch spanende Fertigungsverfahren.  - Completion of the piston (1) by machining manufacturing process.
PCT/DE2012/000669 2011-07-05 2012-07-04 Method for producing a piston for an internal combustion engine WO2013004214A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110106655 DE102011106655A1 (en) 2011-07-05 2011-07-05 Method for producing a piston for an internal combustion engine
DE102011106655.5 2011-07-05

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WO2013004214A1 true WO2013004214A1 (en) 2013-01-10

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WO (1) WO2013004214A1 (en)

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CN103418752B (en) * 2013-09-03 2015-07-29 宁夏共享集团有限责任公司 A kind of ultrahigh circular sand core localization method
DE102015220256A1 (en) 2015-10-19 2017-04-20 Mahle International Gmbh Method for producing a piston
JP7011561B2 (en) * 2018-09-21 2022-01-26 日立Astemo株式会社 Manufacturing method of piston of internal combustion engine
CN112264585B (en) * 2020-10-26 2022-05-31 湖南江滨机器（集团）有限责任公司 Application method of coaxial salt core positioner

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DE10218999A1 (en) 2002-04-27 2003-11-13 Ks Kolbenschmidt Gmbh Ring holder and profiled cooling channel for piston incorporates groove formed by casting or turning and cooling channel with thickened portions on outside of otherwise circular channel
WO2008131738A1 (en) * 2007-04-30 2008-11-06 Mahle International Gmbh Piston for an internal combustion engine, method for the production thereof, and ring carrier therefor

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