EP0958076B1 - Procede et noyau pour la realisation par moulage d'une culasse de moteur a combustion interne - Google Patents
Procede et noyau pour la realisation par moulage d'une culasse de moteur a combustion interne Download PDFInfo
- Publication number
- EP0958076B1 EP0958076B1 EP97932896A EP97932896A EP0958076B1 EP 0958076 B1 EP0958076 B1 EP 0958076B1 EP 97932896 A EP97932896 A EP 97932896A EP 97932896 A EP97932896 A EP 97932896A EP 0958076 B1 EP0958076 B1 EP 0958076B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder head
- core
- mould core
- combustion engine
- moulding
- 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.)
- Expired - Lifetime
Links
Images
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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
- F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
-
- 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
- B22C9/103—Multipart cores
-
- 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 process for the production of foundry parts and aims more particularly a process for casting a cylinder head for internal combustion engine as well that a nucleus for the implementation of this process, to improve accuracy dimensions of all the bedrooms combustion, intake ducts, ducts exhaust.
- a cylinder head of internal combustion engine is performed in a mold comprising at least one core for each combustion chamber, duct sub-assemblies intake and exhaust pipes.
- the core defining the shapes of the combustion chambers often being produced by an integrated footprint the sole (metal bottom) of the mold.
- Such devices have the disadvantage of being sensitive to deviations from positioning of the nuclei with respect to others, these positioning differences coming from either inaccuracies when installing cores in the mold, or movements of the nuclei during of the metal casting caused by the difference density between the cores and the cast metal.
- This disturbance caused by the spoiler is less important than the one previously created by the offset of the end of the duct with the valve seat but is nevertheless penalizing in the case of weak pipes and valves diameter.
- the object of the present invention is therefore to propose a method for casting a cylinder head as well that a nucleus allowing to directly obtain a good location of the valve seats by relative to intake and exhaust ducts so as to eliminate the calibration machining and get better gas flow.
- the method according to the invention relates to molding of a combustion engine cylinder head internal, of the type by which an alloy is poured metal in a mold containing non-nucleus fuses corresponding in particular to the parts hollowed out from the cylinder head such as the chambers of combustion, intake ducts, ducts exhaust and water or oil chambers.
- the process is characterized in that it comprises a step of placing in the mold of a monobloc core integrating the shapes defining both the chambers of combustion and the intake ducts, and supporting rings making up the valve seats.
- the monobloc core also incorporates the shapes defining the exhaust pipes.
- the cylinder head valve seats are made by added and inserted rings during casting, said rings being supported by the monobloc core.
- the monobloc core also incorporates the adapted forms defining the gross repository used for machining starts.
- the invention also relates to a core intended for be used for the implementation of the process defined above and characterized in that it is monobloc type and integrates the forms defining both the combustion chambers and the ducts of admission, and in that it supports rings serving valve seats.
- the monobloc core integrates also the shapes defining the conduits exhaust and supports the rings serving as valve seat.
- the monobloc core also incorporates the adapted forms defining the gross repository used for machining starts.
- said one-piece core is made in a core box and is made of sand compressed and agglomerated with a binder such as resin.
- Figure 1 shows an embodiment particular of a core 1 for the realization by molding of a combustion engine cylinder head internal according to the invention.
- the monobloc core 1 of FIGS. 1 to 3 has four identical parts 4 regularly spaced, arranged in the same alignment, and defining the four combustion chambers of the cylinder head to be molded.
- Each combustion chamber 4 of the monobloc core 1 is connected in its part greater than two arms 2 and an arm 3 defining the two intake ducts and the two Siamese cylinder head exhaust pipes to mold.
- rings 7, not shown on the Figures 1 and 2 are arranged around the conduits intake 2 and exhaust 3, against combustion chambers 4 of the monobloc core 1. These rings 7 are made of material suitable for the valve seat and allow inserting valve seats when pouring of the cylinder head molding.
- the core monoblock 1 comprises a part 5 arranged under the combustion chambers 4. This part 5 extends mainly towards the rooms of combustion 4 neighbors to form a base 5 supporting the combustion chambers 4 to one adapted distance.
- the base 5 also extends transversely to form arms 6 whose ends 8 define the raw repository used for machining starts.
- the thickness of the base 5 is chosen according to the rigidity and holding the desired monobloc core 1.
- the core 1 as shown in the Figures 1 to 3 can be carried out in a known manner in a core box with compressed sand and agglomerated with a binder.
- Figures 4 to 6 show a mode particular realization of a device molding using the monobloc core 1 for setting in the process of molding a cylinder head according to the invention.
- Figure 4 presents more particularly a mold seen from above when only the core monobloc 1 is put in place.
- This mold has four movable lateral mold elements 11, 12, 16 and 17 can be moved apart to facilitate the demolding of the cylinder head and a mold element lower or sole 10 having a surface plane 15 producing the underside of the cylinder head to mold.
- Figure 5 shows a section of the mold of figure 4 when the different nuclei classics needed to mold the chamber water from the cylinder head are in place.
- the mold comprises a movable upper mold element 13, not shown in Figure 4, closing the mold to define the thickness of the walls of the cylinder head to mold and the volume of the chamber oil. Filling holes, not shown in the figure, are arranged through the upper mold element to allow the casting operation.
- the movable side mold element 11 has a cavity for maintaining position of the free end of the arms 2 realizing the intake ducts when the mold is closed.
- the side mold element 12 mobile has a cavity allowing the holding the free end of the arms in position 3 making the exhaust pipes.
- the sole 10 has a cavity 14 intended to receive the monobloc core 1 before closing the mold and the casting operation.
- the shape and volume of the cavity 14 are adapted and adjusted to base 5 and arms 6 of the monobloc core 1 such that shown in Figures 1 to 3, so that the base 5 and the arms 6 are integrally disposed in the cavity 14 of the sole 10 when the one-piece core 1 is arranged in the mold.
- the molding process thus carried out allows obtain a cylinder head with excellent location of the rings 7 forming the seats of valve in relation to the intake ducts 2 and exhaust 3. Indeed, the latter being molded directly by the monobloc core 1 and the rings 7, inserted during casting, being supported by this same monobloc core 1, the precision dimensional of the whole bedroom combustion, valve seats, ducts intake, exhaust pipes is independent of the location of the different nuclei present in the mold and depends only on the quality of construction of the monobloc core 1.
- This molding process using the core monobloc 1 therefore eliminates machining usually required with the conventional cylinder head molding processes using several cores for the conduits and the chamber combustion.
- the use of the monobloc core 1 allows also to make a connection between the conduits and the combustion chamber including aerodynamics is optimized so as to offer very little resistance to air flow.
- Minimizing pressure losses obtained by this process is particularly important for improving the performance of engine.
- the reduction in pressure losses at the connection between the intake duct and the combustion chamber helps to improve noticeably filling the engine and reducing the pollution resulting from combustion.
- the monobloc core 1 defines also the raw repository used for machining starts which eliminates the location uncertainties related to use of different nuclei and get better location of all machining.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
- la figure 1 représente une vue schématique, en perspective, d'un mode de réalisation particulier d'un noyau monobloc servant au moulage d'une culasse de moteur à combustion interne selon l'invention ;
- la figure 2 est une vue de dessus du noyau monobloc représenté à la figure 1 ;
- la figure 3 est une vue de côté du noyau monobloc représenté sur la figure 1 ;
- la figure 4 est une vue de dessus d'un dispositif de moulage utilisé pour la mise en oeuvre du procédé ;
- la figure 5 représente une section transversale suivant la ligne V-V du dispositif de moulage représenté à la figure 4 ;
- la figure 6 représente une vue partielle en coupe longitudinale du dispositif de moulage suivant la ligne VI-VI de la figure 4.
- ouverture du moule par l'écartement des éléments de moule latéraux 11, 12, 16 et 17 et de l'élément de moule supérieur 13;
- mise en place du noyau monobloc 1 sur la semelle 10;
- mise en place des noyaux définissant la chambre d'eau et les passages d'huile;
- fermeture des éléments de moule latéraux 11, 12, 16 et 17 permettant l'immobilisation des noyaux présents dans le moule;
- fermeture de l'élément de moule supérieur 13 et réalisation d'une opération de coulée classique;
- démoulage après un certain temps variable suivant le mode refroidissement choisi.
Claims (8)
- Procédé de réalisation par moulage d'une culasse de moteur à combustion interne, du type par lequel on coule un alliage métallique dans un moule (11,12,13,16,17) renfermant des noyaux non fusibles correspondant notamment aux parties évidées de la culasse telles que les chambres de combustion (4), les conduits d'admission (2), les conduits d'échappement (3) et les chambres d'eau ou d'huile, caractérisé en ce qu'il comprend une étape de mise en place dans le moule d'un noyau monobloc intégrant les formes définissant à la fois les chambres de combustion (4) et les conduits d'admission, et supportant des bagues (7) réalisant les sièges de soupape.
- Procédé de réalisation par moulage d'une culasse de moteur à combustion interne selon la revendication 1, caractérisé en ce que ledit noyau monobloc (1) intègre également les formes définissant les conduits d'échappement (3).
- Procédé de réalisation par moulage d'une culasse de moteur à combustion interne selon l'une quelconque des revendications 1 à 2, caractérisé en ce que les bagues (7) sont insérées à la coulée.
- Procédé de réalisation par moulage d'une culasse de moteur à combustion interne selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ledit noyau monobloc (1) intègre également les formes adaptées définissant le référentiel brut (8) utilisé pour les départs d'usinage.
- Noyau (1) intégrant des formes définissant des cavités particulières d'une culasse de moteur à combustion interne pour le moulage de celle-ci, caractérisé en ce que ledit noyau(1) est monobloc, en ce qu'il intègre les formes définissant à la fois les chambres de combustion (4) et les conduits d'admission (2), et en ce qu'il supporte des bagues (7) servant de sièges de soupape.
- Noyau selon la revendication 5, caractérisé en ce que ledit noyau monobloc (1) intègre également les formes définissant les conduits d'échappement (3).
- Noyau selon la revendication 5 ou 6, caractérisé en ce que ledit noyau monobloc (1) intègre également les formes adaptées (8) définissant le référentiel brut utilisé pour les départs d'usinage.
- Noyau selon revendication 6 ou 7 caractérisé en ce que ledit noyau monobloc (1) est réalisé dans une boite à noyau et est constitué de sable comprimé et aggloméré avec un liant tel que de la résine.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9609071A FR2751251B1 (fr) | 1996-07-19 | 1996-07-19 | Procede et noyau pour la realisation par moulage d'une culasse de moteur a combustion interne |
FR9609071 | 1996-07-19 | ||
PCT/FR1997/001273 WO1998003290A1 (fr) | 1996-07-19 | 1997-07-11 | Procede et noyau pour la realisation par moulage d'une culasse de moteur a combustion interne |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0958076A1 EP0958076A1 (fr) | 1999-11-24 |
EP0958076B1 true EP0958076B1 (fr) | 2003-02-26 |
Family
ID=9494239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97932896A Expired - Lifetime EP0958076B1 (fr) | 1996-07-19 | 1997-07-11 | Procede et noyau pour la realisation par moulage d'une culasse de moteur a combustion interne |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0958076B1 (fr) |
JP (1) | JP2000514898A (fr) |
BR (1) | BR9710505A (fr) |
DE (1) | DE69719375T2 (fr) |
ES (1) | ES2192689T3 (fr) |
FR (1) | FR2751251B1 (fr) |
WO (1) | WO1998003290A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2792858B1 (fr) * | 1999-04-30 | 2001-05-25 | Renault | Procede, dispositif et noyau pour la realisation par moulage d'une culasse de moteur a combustion interne |
FR2793174B1 (fr) * | 1999-05-07 | 2001-06-29 | Renault | Procede et dispositif pour la realisation par moulage d'une culasse de moteur a combustion interne |
FR2823141B1 (fr) * | 2001-04-09 | 2003-06-27 | Renault Sas | Procede de moulage d'une culasse |
FR2848245B1 (fr) | 2002-12-10 | 2007-03-09 | Renault Sa | Siege de soupape pour culasse de moteur a combustion interne |
DE10339653A1 (de) * | 2003-08-28 | 2005-03-24 | Deutz Ag | Gießkernminimierter Zylinderkopf |
US7168529B2 (en) * | 2003-09-24 | 2007-01-30 | Kelsey-Hayes Company | Brake caliper for disc brake assembly and method and apparatus for producing same |
US8997945B1 (en) | 2003-09-24 | 2015-04-07 | Kelsey-Hayes Company | Brake caliper for disc brake assembly and method and apparatus for producing same |
KR101163692B1 (ko) | 2006-11-14 | 2012-07-09 | 현대자동차주식회사 | 실린더 헤드용 연소실 인서트 금형 |
DE102012015328A1 (de) * | 2012-08-01 | 2014-02-06 | GM Global Technology Operations, LLC (n.d. Ges. d. Staates Delaware) | Gießkern und Gießvorrichtung |
DE102014204859A1 (de) * | 2014-03-17 | 2015-09-17 | Volkswagen Aktiengesellschaft | Zylinderkopfbauteil und Verfahren zur Herstellung eines solchen |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4077458A (en) * | 1975-08-08 | 1978-03-07 | Nissan Motor Company, Limited | Core and method for casting cylinder head with exhaust port |
US4969504A (en) * | 1989-07-21 | 1990-11-13 | Brunswick Corporation | Evaporable foam pattern for use in casting an exhaust manifold |
EP0486463B2 (fr) * | 1990-11-16 | 1998-08-05 | AVL List GmbH | Moule de fonderie pour bloc cylindre d'un moteur à combustion à cylindres en V |
US5251683A (en) * | 1991-03-11 | 1993-10-12 | General Motors Corporation | Method of making a cylinder head or other article with cast in-situ ceramic tubes |
US5239956A (en) * | 1991-06-07 | 1993-08-31 | Detroit Diesel Corporation | Internal combustion engine cylinder heads and similar articles of manufacture and methods of manufacturing same |
-
1996
- 1996-07-19 FR FR9609071A patent/FR2751251B1/fr not_active Expired - Fee Related
-
1997
- 1997-07-11 ES ES97932896T patent/ES2192689T3/es not_active Expired - Lifetime
- 1997-07-11 DE DE69719375T patent/DE69719375T2/de not_active Expired - Lifetime
- 1997-07-11 JP JP10506624A patent/JP2000514898A/ja active Pending
- 1997-07-11 WO PCT/FR1997/001273 patent/WO1998003290A1/fr active IP Right Grant
- 1997-07-11 EP EP97932896A patent/EP0958076B1/fr not_active Expired - Lifetime
- 1997-07-11 BR BR9710505A patent/BR9710505A/pt not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE69719375T2 (de) | 2003-12-24 |
EP0958076A1 (fr) | 1999-11-24 |
BR9710505A (pt) | 1999-08-17 |
ES2192689T3 (es) | 2003-10-16 |
WO1998003290A1 (fr) | 1998-01-29 |
FR2751251B1 (fr) | 1998-08-21 |
JP2000514898A (ja) | 2000-11-07 |
FR2751251A1 (fr) | 1998-01-23 |
DE69719375D1 (de) | 2003-04-03 |
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