EP1716943B1 - Gesinterte Kernstütze für Gußeisenzylindergehäuse - Google Patents

Gesinterte Kernstütze für Gußeisenzylindergehäuse Download PDF

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Publication number
EP1716943B1
EP1716943B1 EP06300404A EP06300404A EP1716943B1 EP 1716943 B1 EP1716943 B1 EP 1716943B1 EP 06300404 A EP06300404 A EP 06300404A EP 06300404 A EP06300404 A EP 06300404A EP 1716943 B1 EP1716943 B1 EP 1716943B1
Authority
EP
European Patent Office
Prior art keywords
cast iron
ferrous material
core
iron
prop
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.)
Not-in-force
Application number
EP06300404A
Other languages
English (en)
French (fr)
Other versions
EP1716943A1 (de
Inventor
Pierre Mercier
Guy Bonnet
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1716943A1 publication Critical patent/EP1716943A1/de
Application granted granted Critical
Publication of EP1716943B1 publication Critical patent/EP1716943B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0002—Cylinder arrangements
    • F02F7/0007—Crankcases of engines with cylinders in line
    • 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
    • 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

Definitions

  • the present invention relates to a method of manufacturing by molding in a sand mold a crankcase of internal combustion engine cylinders.
  • the internal combustion engine cylinder housings made of cast iron, are entirely molded by a molding process in a sand mold.
  • This sand mold consists of an outer shell or outer core entirely made of sand, as well as a number of inner cores, also entirely made of sand and intended to form hollow internal parts inside the housing. After molding and after solidification of the cast iron which is poured into the mold, the cores are removed by shaking, that is to say by vibration, and shot blasting.
  • the object of the present invention is to provide a means for making props, more convenient and more economical than the means known from the prior art, and which, moreover, allows to better adapt the nature of the material of which are constituted the props to the nature of the molding material.
  • the subject of the invention is a method of manufacturing, by molding in a sand mold, a cast iron part comprising at least one thin chamber, according to which a mold is used comprising at least one inner core intended to constitute the thin chamber of the workpiece, said core comprising a retaining strut which remains embedded in the casting of the piece after molding, and which is made of sintered ferrous material.
  • the sintered ferrous material is a ferrous material without carbon and, for example, iron.
  • the ferrous material may also be an alloy of iron and molybdenum containing between 0.5% and 2.5% molybdenum.
  • the sintered ferrous material has a density of 5.5 to 7.5.
  • the part produced by means of the method is, for example, an internal combustion engine cylinder casing and in that the thin chamber is the water box of said casing.
  • the invention also relates to an internal combustion engine cylinder casing made of cast iron of the type comprising at least one stanchion embedded in the cast iron, consisting of a sintered ferrous material at least partially impregnated with cast iron.
  • the interface between the strut and the body of the housing consists of a dense zone of thickness between 0.1 mm and 0.5 mm having a substantially pearlitic structure.
  • An internal combustion engine cylinder casing is a piece known in itself which, as shown in section at figure 1 , comprises a plurality of cylinders 1 each delimited by drums 2 surrounded by hollow zones 3 used for the circulation of a cooling fluid.
  • a housing is made of cast iron by molding and, as seen on the figure 1 in the areas between two adjacent barrels, metal parts 4 called stanchions are embedded in the cast iron. These struts 4 are parts intended to consolidate the sand mold used for the manufacture of the housing and remain in place after molding.
  • the sand mold has various elements, and in particular a core such as the core shown in FIG. figure 2 , intended to produce the water chamber 3 of the cylinder housing.
  • the core 5 which is sand, has relatively thin walls 6 and whose spacing is imposed by the holding parts 4.
  • stanchions are metal parts intended to be embedded in the melt of the housing and to remain trapped in this melt.
  • This mold structure for making a cast iron cylinder casing by the sand molding process is known in itself generally.
  • the struts 4 are made in a novel way by powder metallurgy using a powder of a metal material which is sintered, so as to form a solid body having the desired shape and a certain porosity.
  • the material of which the stanchion is made is a ferrous material such as pure or substantially pure iron, that is to say iron whose elements other than iron are only impurities resulting from the elaboration.
  • the material may also be alloyed iron with a relatively limited amount of alloying elements such as molybdenum. In particular, the material can be almost pure iron containing up to 1.5% molybdenum.
  • the part obtained has a density that can be adjusted according to the sintering conditions, and this density can vary between 5.5 and 7.5, and preferably between 6 and 7 and better, be of the order of 6.8 .
  • casings with pure iron stanchions having a density of 6 have been made.
  • a micrographic examination has shown that the liquid metal penetrates by capillarity into the pores to the heart of the stanchion and that it resulted in an improvement of the hardness and an increase of the density of the stanchion.
  • this joining layer is essentially formed of metal supplied by the casting, that is to say of cast iron and that its structure is pearlitic (without graphite lamella).
  • the sulphides that were present in the cast iron are found in the thickness of the tie layer.
  • the props are enriched in carbon by migration of carbon from the cast iron to the stanchion, and that this increase of the carbon content is all the more important that the density is low. .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Powder Metallurgy (AREA)
  • Fluid-Damping Devices (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Body Structure For Vehicles (AREA)

Claims (8)

  1. Herstellungsverfahren zum Formen in einer Form aus Sand eines Gußteils, der mindestens eine dünnwandige Kammer (3) aufweist, gemäß welchem man eine Form verwendet, die mindestens einen Innenkern (5) aufweist, der dazu bestimmt ist, die dünnwandige Kammer (3) des Gußteils zu bilden, wobei der Kern einen Haltepfosten (4) aufweist, der in dem Guss des Teils nach dem Formen eingelassen bleibt, dadurch gekennzeichnet, dass der Pfosten aus gesintertem eisenhaltigem Werkstoff besteht.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der gesinterte eisenhaltige Werkstoff ein eisenhaltiger Werkstoff ohne Kohlenstoff ist.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der eisenhaltige Werkstoff ohne Kohlenstoff Eisen ist.
  4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der eisenhaltige Werkstoff eine Legierung aus Eisen und Molybdän, die zwischen 0,5 % und 2,5 % Molybdän enthält, ist.
  5. Verfahren nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass der gesinterte eisenhaltige Werkstoff eine Dichte zwischen 5,5 und 7,5 hat.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Werkstück ein Zylinderkurbelgehäuse eines Verbrennungsmotors ist, und dass die dünnwandige Kammer (3) der Wasserkasten des Gehäuses ist.
  7. Zylinderkurbelgehäuse für Verbrennungsmotor aus Guss des Typs, der mindestens einen Pfeiler (4) aufweist, der in dem Guss eingelassen ist, dadurch gekennzeichnet, dass der Pfeiler aus einem gesinterten eisenhaltigen Werkstoff besteht, der mindestens teilweise mit Guss imprägniert ist.
  8. Zylinderkurbelgehäuse für Verbrennungsmotor nach Anspruch 7, dadurch gekennzeichnet, dass die Verbindungszone zwischen dem Pfeiler (4) und dem Körper des Gehäuses eine Stärke zwischen 0,1 mm und 0,5 mm hat.
EP06300404A 2005-04-29 2006-04-25 Gesinterte Kernstütze für Gußeisenzylindergehäuse Not-in-force EP1716943B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0504430A FR2885061B1 (fr) 2005-04-29 2005-04-29 Etancon fritte pour carter cylindre fonte

Publications (2)

Publication Number Publication Date
EP1716943A1 EP1716943A1 (de) 2006-11-02
EP1716943B1 true EP1716943B1 (de) 2010-08-18

Family

ID=35414607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06300404A Not-in-force EP1716943B1 (de) 2005-04-29 2006-04-25 Gesinterte Kernstütze für Gußeisenzylindergehäuse

Country Status (4)

Country Link
EP (1) EP1716943B1 (de)
AT (1) ATE477869T1 (de)
DE (1) DE602006016192D1 (de)
FR (1) FR2885061B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012110592A1 (de) * 2012-11-06 2014-05-08 Martinrea Honsel Germany Gmbh Verfahren zum Herstellen eines Zylinderkurbelgehäuses und Gießformanordnung für ein Zylinderkurbelgehäuse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013101942B3 (de) * 2013-02-27 2014-07-31 Ks Aluminium-Technologie Gmbh Kühlmittelmantelkern sowie Verfahren zur Herstellung eines Kühlmittelmantelkerns

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446906A (en) * 1980-11-13 1984-05-08 Ford Motor Company Method of making a cast aluminum based engine block
JPS61182848A (ja) * 1985-02-08 1986-08-15 Honda Motor Co Ltd ケレン
AT388319B (de) * 1987-08-20 1989-06-12 Avl Verbrennungskraft Messtech Giesskern fuer den wassermantel eines zylinderblockes einer mehrzylinder-hubkolben-brennkraftmaschine
DE19832718A1 (de) * 1998-07-21 2000-01-27 Vaw Alucast Gmbh Verfahren zum Erzeugen eines kleinen Hohlraumes in einem Gußstück

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012110592A1 (de) * 2012-11-06 2014-05-08 Martinrea Honsel Germany Gmbh Verfahren zum Herstellen eines Zylinderkurbelgehäuses und Gießformanordnung für ein Zylinderkurbelgehäuse

Also Published As

Publication number Publication date
EP1716943A1 (de) 2006-11-02
FR2885061B1 (fr) 2007-07-27
FR2885061A1 (fr) 2006-11-03
ATE477869T1 (de) 2010-09-15
DE602006016192D1 (de) 2010-09-30

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