EP0958076A1 - Method and core for moulding an internal combustion engine cylinder head - Google Patents

Method and core for moulding an internal combustion engine cylinder head

Info

Publication number
EP0958076A1
EP0958076A1 EP97932896A EP97932896A EP0958076A1 EP 0958076 A1 EP0958076 A1 EP 0958076A1 EP 97932896 A EP97932896 A EP 97932896A EP 97932896 A EP97932896 A EP 97932896A EP 0958076 A1 EP0958076 A1 EP 0958076A1
Authority
EP
European Patent Office
Prior art keywords
core
cylinder head
internal combustion
combustion engine
molding
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.)
Granted
Application number
EP97932896A
Other languages
German (de)
French (fr)
Other versions
EP0958076B1 (en
Inventor
FrançoisLe Mehnhir BAUDLOT
Patrick Gallard
André LE NEZET
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP0958076A1 publication Critical patent/EP0958076A1/en
Application granted granted Critical
Publication of EP0958076B1 publication Critical patent/EP0958076B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 castings and relates more particularly to a process for casting a cylinder head for an internal combustion engine, as well as a core for the implementation of this process, making it possible to improve the dimensional accuracy of all combustion chambers, intake ducts, exhaust ducts.
  • an internal combustion engine cylinder head is carried out in a mold comprising at least one core for each of the sub-assemblies of combustion chambers, intake ducts and exhaust ducts.
  • the core defining the shapes of the combustion chambers is often produced by an imprint integrated into the sole (metal bottom) of the mold.
  • Such devices have the disadvantage of being sensitive to differences in positioning of the cores relative to each other, these positioning differences arising either from inaccuracies during the positioning of the cores in the mold, or from movements of the cores during the casting of the metal caused by the difference in density between the cores and the cast metal.
  • These differences in positioning of the cores forming the intake and exhaust ducts generally cause a shift between the position of the valve seat linked to the combustion chamber and the end of the intake or exhaust duct which disturbs the air flow and deteriorates engine performance.
  • This disturbance generated by the spoiler is less significant than that previously created by the offset of one end of the conduit with the valve seat but is nevertheless penalizing in the case of conduits and valves of small diameter.
  • the object of the present invention is therefore to propose a method for casting a cylinder head as well as a core making it possible to directly obtain a good location of the valve seats with respect to the intake and exhaust ducts so as to eliminate calibration machining and obtain better gas flow.
  • the carrying out this process and its associated core remaining simple and economical to carry out.
  • the method according to the invention relates to the molding of an internal combustion engine cylinder head, of the type by which a metal alloy is poured into a mold containing non-fusible cores corresponding in particular to the recessed parts of the cylinder head such as the combustion chambers , intake pipes, exhaust pipes and water or oil chambers.
  • the method is characterized in that a single monobloc core integrates the shapes defining both the combustion chambers and the intake ducts.
  • the one-piece core also incorporates the shapes defining the exhaust ducts.
  • valve seats of the cylinder head are produced by rings added and inserted during casting, said rings being supported by the monobloc core.
  • the monobloc core also incorporates the adapted shapes defining the gross reference frame used for machining starts.
  • the invention also relates to a core intended to be used for the implementation of the method defined above and characterized in that it is of the one-piece type and incorporates the shapes defining both the combustion chambers and the ducts of admission.
  • the monobloc core also incorporates the shapes defining the exhaust ducts and supports the rings serving as valve seats.
  • the monobloc core also incorporates the adapted shapes defining the gross reference frame used for the machining starts.
  • said monobloc core is produced in a core box and consists of compressed sand and agglomerated with a binder such as resin.
  • FIG. 1 shows a schematic perspective view of a particular embodiment of a one-piece core used for molding an internal combustion engine cylinder head according to one invention
  • - Figure 2 is a top view of the one-piece core shown in Figure 1, -
  • FIG. 3 is a side view of the one-piece core shown in Figure 1;
  • FIG. 4 is a top view of a molding device used for the implementation of the method, -
  • FIG. 5 shows a cross section along the line V-V of the molding device shown in Figure 4;
  • FIG. 6 represents a partial view in longitudinal section of the molding device along line VI-VI of FIG. 4.
  • FIG. 1 shows a particular embodiment of a core 1 for the production by molding of an internal combustion engine cylinder head according to the invention.
  • FIGS. 1 to 3 we see a core 1 of the monobloc type used for molding a cylinder head of internal combustion engine type four cylinders in line and four valves per cylinder.
  • the monobloc core 1 of FIGS. 1 to 3 comprises four identical parts 4 regularly spaced apart, 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 upper part to two arms 2 and to an arm 3 respectively defining the two intake ducts and the two Siamese exhaust ducts of the cylinder head to be molded.
  • rings 7, not shown in FIGS. 1 and 2 are arranged around the intake 2 and exhaust 3 conduits, against the combustion chambers 4 of the monobloc core 1
  • These rings 7 are made of material suitable for the production of a valve seat and allow the valve seats to be inserted during the casting of the cylinder head.
  • the monobloc core 1 comprises a part 5 disposed under the combustion chambers 4. This part 5 extends mainly in the direction of the neighboring combustion chambers 4 to form a base 5 supporting the combustion chambers 4 to a suitable distance.
  • the base 5 also extends transversely to form arms 6, the ends 8 of which define the raw reference frame used for the machining starts.
  • the thickness of the base 5 is chosen according to the rigidity and the strength of the monobloc core 1 desired.
  • the core 1 as shown in Figures 1 to 3 can be produced in a known manner in a core box with compressed sand and agglomerated with a binder.
  • Figures 4 to 6 show a particular embodiment of a molding device using the one-piece core 1 for implementing the method of molding a cylinder head according to
  • FIG. 4 presents more particularly a mold seen from above when only the one-piece core 1 is put in place.
  • This mold comprises four movable lateral mold elements 11, 12, 16 and 17 which can move apart to facilitate demolding of the cylinder head and a lower mold element or sole 10 having a flat surface 15 forming the lower face of the cylinder head to be molded .
  • FIG. 5 shows a section of the mold of FIG. 4 when the various conventional cores necessary for molding the water chamber of the cylinder head are put in place.
  • the mold comprises a movable upper mold element 13, not shown in FIG. 4, closing the mold to define the thickness of the walls of the cylinder head to be molded and the volume of the oil chamber. Filling holes, not shown in the figure, are formed through the upper mold element to allow the casting operation.
  • the movable lateral mold element 11 has a cavity allowing the free end of the arms 2 to hold in position, forming the intake ducts when the mold is closed.
  • the movable lateral mold element 12 has a cavity allowing the free end of the arms 3 making the exhaust ducts to be held in position.
  • the sole 10 has a cavity 14 for receiving the one-piece core 1 before the mold is closed and the casting operation.
  • the shape and volume of the cavity 14 are adapted and adjusted to the base 5 and to the arms 6 of the one-piece core 1 as shown in FIGS. 1 to 3, so that the base 5 and the arms 6 are integrally arranged in the cavity 14 of the sole 10 when the one-piece core 1 is placed in the mold.
  • the method of production by molding of the cylinder head comprises the following operations:
  • the molding process thus produced makes it possible to obtain a cylinder head having an excellent location of the rings 7 forming the valve seats with respect to the intake 2 and exhaust 3 conduits.
  • the latter being molded directly by the monobloc core l and the rings 7, inserted during casting, being supported by this same monobloc core 1, the dimensional accuracy of the combustion chamber, valve seats, intake ducts, exhaust ducts is independent of the location of the different cores present in the mold and depends solely on the quality of production of the monobloc core 1.
  • This molding process using the monobloc core 1 therefore makes it possible to dispense with the calibration machining usually necessary with the conventional cylinder head molding processes using several cores for the conduits and the combustion chamber.
  • the use of the monobloc core 1 also makes it possible to produce a connection between the conduits and the combustion chamber, the aerodynamics of which are optimized so as to offer very little resistance to the flow of air.
  • the monobloc core 1 also defines the raw reference frame used for the machining starts, which makes it possible to eliminate the localization uncertainties linked to the use of different cores and to obtain better localization of all the machining operations.
  • the invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example.
  • the method of using a monobloc core integrating the shapes defining both the combustion chambers, the intake ducts and the exhaust ducts can be used in other types of molds such as pressure casting or squeeze-casting or sand molds (green or self-hardening).

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  • 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)

Abstract

A method and a core for moulding an internal combustion engine cylinder head, wherein a metal alloy is cast in a mould containing non-meltable cores corresponding, in particular, to the hollow portions of the cylinder head, e.g. the combustion chambers (4), the intake ducts (2), the exhaust ducts (3) and the water or oil chambers, and a single integral core (1) defines both the combustion chambers (4) and the intake ducts (2).

Description

PROCEDE ET NOYAU POUR LA REALISATION PAR MOULAGE D'UNE CULASSE DE MOTEUR A COMBUSTION INTERNE PROCESS AND CORE FOR MOLDING A CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
La présente invention se rapporte à un procédé d'élaboration de pièces de fonderie et vise plus particulièrement un procédé de coulée d'une culasse pour moteur à combustion interne, ainsi qu'un noyau pour la mise en oeuvre de ce procédé, permettant d'améliorer les précisions dimensionnelles de l'ensemble chambres de combustion, conduits d'admission, conduits d' échappement .The present invention relates to a process for the production of castings and relates more particularly to a process for casting a cylinder head for an internal combustion engine, as well as a core for the implementation of this process, making it possible to improve the dimensional accuracy of all combustion chambers, intake ducts, exhaust ducts.
Classiquement la réalisation d'une culasse de moteur à combustion interne est effectuée dans un moule comportant aux moins un noyau pour chacun des sous ensembles chambres de combustion, conduits d'admission et conduits d'échappement. Le noyau définissant les formes des chambres de combustion étant souvent réalisé par une empreinte intégrée à la semelle (fond métallique) du moule.Conventionally, the production of an internal combustion engine cylinder head is carried out in a mold comprising at least one core for each of the sub-assemblies of combustion chambers, intake ducts and exhaust ducts. The core defining the shapes of the combustion chambers is often produced by an imprint integrated into the sole (metal bottom) of the mold.
De tels dispositifs présentent l'inconvénient d'être sensibles aux écarts de positionnement des noyaux les uns par rapport aux autres, ces écarts de positionnement provenant soit d'imprécisions lors de la mise en place des noyaux dans le moule, soit de mouvements des noyaux lors de la coulée du métal provoqués par la différence de densité entre les noyaux et le métal coulé. Ces écarts de positionnement des noyaux réalisant les conduits d'admission et d'échappement provoque généralement un décalage entre la position du siège de soupape lié à la chambre de combustion et l'extrémité du conduit d'admission ou d'échappement qui perturbe l'écoulement de l'air et détériore le rendement du moteur .Such devices have the disadvantage of being sensitive to differences in positioning of the cores relative to each other, these positioning differences arising either from inaccuracies during the positioning of the cores in the mold, or from movements of the cores during the casting of the metal caused by the difference in density between the cores and the cast metal. These differences in positioning of the cores forming the intake and exhaust ducts generally cause a shift between the position of the valve seat linked to the combustion chamber and the end of the intake or exhaust duct which disturbs the air flow and deteriorates engine performance.
Il est connu, pour remédier à cet inconvénient, d'effectuer un usinage de calibrage du raccord entre les conduits et les sièges de soupapes. Cet usinage, réalisé par exemple par fraisage, permet l'alignement du siège de soupape avec le conduit mais entraîne le plus souvent la création d'un becquet, correspondant à une discontinuité de la pente du conduit au niveau de l'intersection de ce dernier avec la trajectoire de la fraise, qui vient perturber l'écoulement de 1 ' air.It is known, to remedy this drawback, to carry out calibration machining of the connection between the conduits and the valve seats. This machining, performed for example by milling, allows the alignment of the valve seat with the conduit but most often results in the creation of a spoiler, corresponding to a discontinuity in the slope of the conduit at the intersection of the latter. with the trajectory of the cutter, which disturbs the flow of air.
Cette perturbation engendrée par le becquet est moins importante que celle précédemment crée par le décalage de 1 ' extrémité du conduit avec le siège de soupape mais est néanmoins pénalisante dans le cas de conduits et de soupapes de faible diamètre .This disturbance generated by the spoiler is less significant than that previously created by the offset of one end of the conduit with the valve seat but is nevertheless penalizing in the case of conduits and valves of small diameter.
Le but de la présente invention est donc de proposer un procédé de coulée d'une culasse ainsi qu'un noyau permettant d'obtenir directement une bonne localisation des sièges de soupape par rapport aux conduits d'admission et d'échappement de façon à supprimer l'usinage de calibrage et obtenir un meilleur écoulement des gaz . La réalisation de ce procédé et de son noyau associé restant simple et économique à réaliser.The object of the present invention is therefore to propose a method for casting a cylinder head as well as a core making it possible to directly obtain a good location of the valve seats with respect to the intake and exhaust ducts so as to eliminate calibration machining and obtain better gas flow. The carrying out this process and its associated core remaining simple and economical to carry out.
Le procédé selon l'invention concerne le moulage d'une culasse de moteur à combustion interne, du type par lequel on coule un alliage métallique dans un moule renfermant des noyaux non fusibles correspondant notamment aux parties évidées de la culasse telles que les chambres de combustion, les conduits d'admission, les conduits d'échappement et les chambres d'eau ou d'huile.The method according to the invention relates to the molding of an internal combustion engine cylinder head, of the type by which a metal alloy is poured into a mold containing non-fusible cores corresponding in particular to the recessed parts of the cylinder head such as the combustion chambers , intake pipes, exhaust pipes and water or oil chambers.
Selon l'invention le procédé est caractérisé en ce qu'un seul noyau monobloc intègre les formes définissant à la fois les chambres de combustion et les conduits d'admission.According to the invention, the method is characterized in that a single monobloc core integrates the shapes defining both the combustion chambers and the intake ducts.
Selon une autre caractéristique du procédé de réalisation par moulage d'une culasse selon l'invention, le noyau monobloc intègre également les formes définissant les conduits d'échappement.According to another characteristic of the process for producing a cylinder head according to the invention, the one-piece core also incorporates the shapes defining the exhaust ducts.
Selon une autre caractéristique du procédé de réalisation par moulage d'une culasse selon l'invention, les sièges de soupapes de la culasse sont réalisés par des bagues rapportées et insérées à la coulée, lesdites bagues étant supportées par le noyau monobloc .According to another characteristic of the method of making a cylinder head by molding according to the invention, the valve seats of the cylinder head are produced by rings added and inserted during casting, said rings being supported by the monobloc core.
Selon une autre caractéristique du procédé de réalisation par moulage d'une culasse selon l'invention, le noyau monobloc intègre également les formes adaptées définissant le référentiel brut utilisé pour les départs d'usinage. L'invention concerne également un noyau destiné à être utilisé pour la mise en oeuvre du procédé définit ci-dessus et caractérisé en ce qu'il est de type monobloc et intègre les formes définissant à la fois les chambres de combustion et les conduits d' admission.According to another characteristic of the process for producing a cylinder head according to the invention, the monobloc core also incorporates the adapted shapes defining the gross reference frame used for machining starts. The invention also relates to a core intended to be used for the implementation of the method defined above and characterized in that it is of the one-piece type and incorporates the shapes defining both the combustion chambers and the ducts of admission.
Avantageusement, le noyau monobloc intègre également les formes définissant les conduits d'échappement et supporte les bagues servant de siège de soupapes.Advantageously, the monobloc core also incorporates the shapes defining the exhaust ducts and supports the rings serving as valve seats.
Selon une autre caractéristique de l'invention, le noyau monobloc intègre également les formes adaptées définissant le référentiel brut utilisé pour les départs d'usinage.According to another characteristic of the invention, the monobloc core also incorporates the adapted shapes defining the gross reference frame used for the machining starts.
Selon encore une autre caractéristique de l'invention, ledit noyau monobloc est réalisé dans une boite à noyau et est constitué de sable comprimé et aggloméré avec un liant tel que de la résine.According to yet another characteristic of the invention, said monobloc core is produced in a core box and consists of compressed sand and agglomerated with a binder such as resin.
On comprendra mieux les buts, aspects et avantages de la présente invention, d'après la description donnée ci-après de différents modes de réalisation de l'invention, présentés à titre d'exemples non limitatifs, en se référant aux dessins annexés, dans lesquels :The objects, aspects and advantages of the present invention will be better understood from the description given below of various embodiments of the invention, presented by way of non-limiting examples, with reference to the accompanying drawings, in which :
- 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 1 ' invention ; - la figure 2 est une vue de dessus du noyau monobloc représenté à la figure 1 , -- Figure 1 shows a schematic perspective view of a particular embodiment of a one-piece core used for molding an internal combustion engine cylinder head according to one invention; - Figure 2 is a top view of the one-piece core shown in Figure 1, -
- la figure 3 est une vue de côté du noyau monobloc représenté sur la figure 1 ;- Figure 3 is a side view of the one-piece core shown in Figure 1;
- la figure 4 est une vue de dessus d'un dispositif de moulage utilisé pour la mise en oeuvre du procédé , -- Figure 4 is a top view of a molding device used for the implementation of the method, -
- la figure 5 représente une section transversale suivant la ligne V-V du dispositif de moulage représenté à la figure 4 ;- Figure 5 shows a cross section along the line V-V of the molding device shown in 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.FIG. 6 represents a partial view in longitudinal section of the molding device along line VI-VI of FIG. 4.
Pour faciliter la lecture des dessins, les mêmes pièces portent les mêmes références d'une figure à l'autre. Par ailleurs, seuls les éléments nécessaires à la compréhension de 1 ' invention ont été figurés.To make the drawings easier to read, the same parts have the same references from one figure to another. Furthermore, only the elements necessary for understanding the invention have been shown.
La figure 1 présente un mode de réalisation particulier d'un noyau 1 pour la réalisation par moulage d'une culasse de moteur à combustion interne selon l'invention.FIG. 1 shows a particular embodiment of a core 1 for the production by molding of an internal combustion engine cylinder head according to the invention.
En se reportant aux figures 1 à 3, on voit un noyau 1 de type monobloc utilisé pour le moulage d'une culasse de moteur à combustion interne de type à quatre cylindres en ligne et quatre soupapes par cylindre. Le noyau monobloc 1 des figures 1 à 3 comporte quatre parties identiques 4 régulièrement espacées, disposées dans un même alignement, et définissant les quatre chambres de combustion de la culasse à mouler. Chaque chambre de combustion 4 du noyau monobloc 1 est reliée dans sa partie supérieure à deux bras 2 et à un bras 3 définissant respectivement les deux conduits d'admission et les deux conduits d'échappement siamoises de la culasse à mouler .Referring to Figures 1 to 3, we see a core 1 of the monobloc type used for molding a cylinder head of internal combustion engine type four cylinders in line and four valves per cylinder. The monobloc core 1 of FIGS. 1 to 3 comprises four identical parts 4 regularly spaced apart, 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 upper part to two arms 2 and to an arm 3 respectively defining the two intake ducts and the two Siamese exhaust ducts of the cylinder head to be molded.
Comme on peut le voir plus précisément sur la figure 3, des bagues 7, non représentées sur les figures 1 et 2, sont disposées autour des conduits d'admission 2 et d'échappement 3, contre les chambres de combustion 4 du noyau monobloc 1. Ces bagues 7 sont en matériau adapté pour la réalisation d'un siège de soupape et permettent 1 ' insertion à la coulée des sièges de soupape lors du moulage de la culasse .As can be seen more precisely in FIG. 3, rings 7, not shown in FIGS. 1 and 2, are arranged around the intake 2 and exhaust 3 conduits, against the combustion chambers 4 of the monobloc core 1 These rings 7 are made of material suitable for the production of a valve seat and allow the valve seats to be inserted during the casting of the cylinder head.
Conformément aux figures 1 à 3, le noyau monobloc 1 comporte une partie 5 disposée sous les chambres de combustion 4. Cette partie 5 s'étend principalement en direction des chambres de combustion 4 voisines pour former un socle 5 supportant les chambres de combustion 4 à une distance adaptée.In accordance with FIGS. 1 to 3, the monobloc core 1 comprises a part 5 disposed under the combustion chambers 4. This part 5 extends mainly in the direction of the neighboring combustion chambers 4 to form a base 5 supporting the combustion chambers 4 to a suitable distance.
Le socle 5 se prolonge également transversalement pour former des bras 6 dont les extrémités 8 définissent le référentiel brut utilisé pour les départs d'usinage. L'épaisseur du socle 5 est choisie en fonction de la rigidité et de la tenue du noyau monobloc 1 souhaitée.The base 5 also extends transversely to form arms 6, the ends 8 of which define the raw reference frame used for the machining starts. The thickness of the base 5 is chosen according to the rigidity and the strength of the monobloc core 1 desired.
Le noyau 1 tel que représenté sur les figures 1 à 3 peut être réalisé de façon connue dans une boite à noyau avec du sable comprimé et aggloméré avec un liant.The core 1 as shown in Figures 1 to 3 can be produced in a known manner in a core box with compressed sand and agglomerated with a binder.
Les figures 4 à 6 présentent un mode particulier de réalisation d'un dispositif de moulage utilisant le noyau monobloc 1 pour la mise en oeuvre du procédé de moulage d'une culasse selonFigures 4 to 6 show a particular embodiment of a molding device using the one-piece core 1 for implementing the method of molding a cylinder head according to
1 ' invention.1 invention.
La figure 4 présente plus particulièrement un moule vue de dessus lorsque seul le noyau monobloc 1 est mis en place. Ce moule comporte quatre éléments de moule latéraux mobiles il, 12, 16 et 17 pouvant s'écarter pour faciliter le démoulage de la culasse et un élément de moule inférieur ou semelle 10 comportant une surface plane 15 réalisant la face inférieure de la culasse à mouler.FIG. 4 presents more particularly a mold seen from above when only the one-piece core 1 is put in place. This mold comprises four movable lateral mold elements 11, 12, 16 and 17 which can move apart to facilitate demolding of the cylinder head and a lower mold element or sole 10 having a flat surface 15 forming the lower face of the cylinder head to be molded .
La figure 5 présente une section du moule de la figure 4 lorsque les différents noyaux classiques nécessaires au moulage de la chambre d'eau de la culasse sont mis en place. Le moule comporte un élément de moule supérieur 13 mobile, non représenté sur la figure 4, venant fermer le moule pour définir l'épaisseur des parois de la culasse à mouler et le volume de la chambre d'huile. Des orifices de remplissage, non représentés sur la figure, sont ménagés à travers l'élément de moule supérieur pour permettre 1 * opération de coulée .FIG. 5 shows a section of the mold of FIG. 4 when the various conventional cores necessary for molding the water chamber of the cylinder head are put in place. The mold comprises a movable upper mold element 13, not shown in FIG. 4, closing the mold to define the thickness of the walls of the cylinder head to be molded and the volume of the oil chamber. Filling holes, not shown in the figure, are formed through the upper mold element to allow the casting operation.
L'élément de moule latéral 11 mobile comporte une cavité permettant le maintien en position de l'extrémité libre des bras 2 réalisant les conduits d'admission lorsque le moule est fermé. De la même façon, l'élément de moule latéral 12 mobile comporte une cavité permettant le maintien en position de l'extrémité libre des bras 3 réalisant les conduits d'échappement.The movable lateral mold element 11 has a cavity allowing the free end of the arms 2 to hold in position, forming the intake ducts when the mold is closed. Likewise, the movable lateral mold element 12 has a cavity allowing the free end of the arms 3 making the exhaust ducts to be held in position.
Comme on peut le voir sur les figures 5 et 6, la semelle 10 comporte une cavité 14 destinée à recevoir le noyau monobloc 1 avant la fermeture du moule et l'opération de coulée. La forme et le volume de la cavité 14 sont adaptés et ajustés au socle 5 et aux bras 6 du noyau monobloc 1 tel que représenté sur les figures 1 à 3, de façon à ce que le socle 5 et les bras 6 soient intégralement disposés dans la cavité 14 de la semelle 10 lorsque le noyau monobloc 1 est disposé dans le moule.As can be seen in Figures 5 and 6, the sole 10 has a cavity 14 for receiving the one-piece core 1 before the mold is closed and the casting operation. The shape and volume of the cavity 14 are adapted and adjusted to the base 5 and to the arms 6 of the one-piece core 1 as shown in FIGS. 1 to 3, so that the base 5 and the arms 6 are integrally arranged in the cavity 14 of the sole 10 when the one-piece core 1 is placed in the mold.
Ainsi, seuls les éléments du noyau monobloc 1 définissant des cavités particulières de la culasse à mouler tels que les conduits d'admission 2, les conduits d'échappement 3, les chambres de combustion 4 et les extrémités 8 des bras 6 sont disposés au dessus de la surface plane 15 de la semelle 10 définissant la face inférieure de la culasse .Thus, only the elements of the monobloc core 1 defining particular cavities of the cylinder head to be molded such as the intake conduits 2, the exhaust conduits 3, the combustion chambers 4 and the ends 8 of the arms 6 are arranged above. of the flat surface 15 of the sole 10 defining the underside of the cylinder head.
Conformément à la description qui précède et aux figures 4 à 6, le procédé de réalisation par moulage de la culasse comporte les opérations suivantes :In accordance with the above description and in FIGS. 4 to 6, the method of production by molding of the cylinder head comprises the following operations:
- ouverture du moule par 1 ' écartement des éléments de moule latéraux 11, 12, 16 et 17 et de l'élément de moule supérieur 13;- opening of the mold by spacing the side mold elements 11, 12, 16 and 17 and the upper mold element 13;
- mise en place du noyau monobloc 1 sur la semelle 10;- Installation of the one-piece core 1 on the sole 10;
- mise en place des noyaux définissant la chambre d'eau et les passages d'huile;- installation of cores defining the water chamber and the oil passages;
- fermeture des éléments de moule latéraux 11, 12, 16 et 17 permettant l'immobilisation des noyaux présents dans le moule ;- closing of the lateral mold elements 11, 12, 16 and 17 allowing the immobilization of the cores present in the mold;
- fermeture de l'élément de moule supérieur 13 et réalisation d'une opération de coulée classique;- Closing the upper mold element 13 and carrying out a conventional casting operation;
- démoulage après un certain temps variable suivant le mode refroidissement choisi.- demoulding after a certain variable time depending on the cooling mode chosen.
Le procédé de moulage ainsi réalisé permet d'obtenir une culasse possédant une excellente localisation des bagues 7 formant les sièges de soupape par rapport aux conduits d'admission 2 et d'échappement 3. En effet, ces derniers étant moulés directement par le noyau monobloc l et les bagues 7, insérées à la coulée, étant supportées par ce même noyau monobloc 1, la précision dim ensionnelle de 1 ' ensemble chambre de combustion, sièges de soupape, conduits d'admission, conduits d'échappement est indépendante de l'emplacement des différents noyaux présents dans le moule et dépend uniquement de la qualité de réalisation du noyau monobloc 1.The molding process thus produced makes it possible to obtain a cylinder head having an excellent location of the rings 7 forming the valve seats with respect to the intake 2 and exhaust 3 conduits. In fact, the latter being molded directly by the monobloc core l and the rings 7, inserted during casting, being supported by this same monobloc core 1, the dimensional accuracy of the combustion chamber, valve seats, intake ducts, exhaust ducts is independent of the location of the different cores present in the mold and depends solely on the quality of production of the monobloc core 1.
Ce procédé de moulage utilisant le noyau monobloc 1 permet donc de s'affranchir de l'usinage de calibrage habituellement nécessaire avec les procédés de moulage de culasse classique utilisant plusieurs noyaux pour les conduits et la chambre de combustion.This molding process using the monobloc core 1 therefore makes it possible to dispense with the calibration machining usually necessary with the conventional cylinder head molding processes using several cores for the conduits and the combustion chamber.
L'utilisation du noyau monobloc 1 permet également de réaliser un raccord entre les conduits et la chambre de combustion dont 1 ' aérodynamique est optimisée de façon à n'offrir que très peu de résistance au flux d'air.The use of the monobloc core 1 also makes it possible to produce a connection between the conduits and the combustion chamber, the aerodynamics of which are optimized so as to offer very little resistance to the flow of air.
La minimisation des pertes de charges obtenue par ce procédé est particulièrement importante pour l'amélioration des performances du moteur. Ainsi, la diminution des pertes de charge au niveau du raccord entre le conduit d'admission et la chambre de combustion contribue à améliorer nettement le remplissage du moteur et à diminuer la pollution résultant de la combustion.The minimization of pressure drops obtained by this process is particularly important for improving engine performance. Thus, the reduction in pressure losses at the connection between the intake duct and the combustion chamber contributes to significantly improving the filling of the engine and to reducing the pollution resulting from combustion.
Par ailleurs, le noyau monobloc 1 définit également le référentiel brut utilisé pour les départs d'usinage ce qui permet de supprimer les incertitudes de localisation liées à l'utilisation de noyaux différents et d'obtenir une meilleure localisation de tous les usinages. Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple.Furthermore, the monobloc core 1 also defines the raw reference frame used for the machining starts, which makes it possible to eliminate the localization uncertainties linked to the use of different cores and to obtain better localization of all the machining operations. Of course, the invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example.
Au contraire, l'invention comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont effectuées suivant son esprit .On the contrary, the invention includes all the technical equivalents of the means described and their combinations if these are carried out according to the spirit.
Ainsi, le procédé d'utilisation d'un noyau monobloc intégrant les formes définissant à la fois les chambres de combustion, les conduits d'admission et les conduits d'échappement peut être utilisé dans d'autres types de moules tels que des moules à coulée sous pression ou squeeze-casting ou des moules sable (à vert ou autodurcissant) . Thus, the method of using a monobloc core integrating the shapes defining both the combustion chambers, the intake ducts and the exhaust ducts can be used in other types of molds such as pressure casting or squeeze-casting or sand molds (green or self-hardening).

Claims

REVENDICATIONS
[1] 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 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'un seul noyau monobloc (1) intègre les formes définissant à la fois les chambres de combustion[1] Process for producing by molding an internal combustion engine cylinder head, of the type by which a metal alloy is poured into a mold containing non-fusible cores corresponding in particular to the hollowed-out parts of the cylinder head such as the combustion chambers ( 4), the intake conduits (2), the exhaust conduits (3) and the water or oil chambers, characterized in that a single one-piece core (1) integrates the shapes defining both the combustion chambers
(4) et les conduits d'admission (2).(4) and the intake ducts (2).
[ 2 ] 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).[2] Method for producing by molding an internal combustion engine cylinder head according to claim 1, characterized in that said one-piece core (1) also integrates the shapes defining the exhaust ducts (3).
[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 . sièges de soupapes de la culasse sont réalisés par des bagues (7) rapportées et insérées à la coulée, lesditeε bagues (7) étant supportées par ledit noyau monobloc (1) .[3] Method for producing by molding an internal combustion engine cylinder head according to any one of claims 1 to 2, characterized in that the. valve seats of the cylinder head are made by rings (7) attached and inserted into the casting, said rings (7) being supported by said one-piece core (1).
[4] 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. [4] Method for producing by molding an internal combustion engine cylinder head according to any one of claims 1 to 3, characterized in that said one-piece core (1) also integrates the adapted shapes defining the raw reference frame (8) used for machining starts.
[5] Noyau pour la réalisation par moulage d'une culasse de moteur à combustion interne, caractérisé en ce que ledit noyau est de type monobloc (l) et intègre les formes définissant à la fois les chambres de combustion (4) et les conduits d' admission (2) .[5] Core for producing by molding an internal combustion engine cylinder head, characterized in that said core is of the monobloc type (l) and integrates the shapes defining both the combustion chambers (4) and the conduits admission (2).
[6] Noyau selon la revendication 5, caractérisé en ce que ledit noyau monobloc (1) intègre également les formes définissant les conduits d'échappement (3).[6] Core according to claim 5, characterized in that said one-piece core (1) also integrates the shapes defining the exhaust ducts (3).
[7] Noyau selon l'une quelconque des revendications 5 à 6, caractérisé en ce que ledit noyau monobloc (1) supporte des bagues (7) servant de siège de soupapes.[7] Core according to any one of claims 5 to 6, characterized in that said one-piece core (1) supports rings (7) serving as valve seats.
[8] Noyau selon l'une quelconque des revendications 5 à 7, caractérisé en ce que ledit noyau monobloc (1) intègre également les formes adaptées (8) définissant le réfèrentiel brut utilisé pour les départs d'usinage.[8] Core according to any one of claims 5 to 7, characterized in that said one-piece core (1) also integrates the adapted shapes (8) defining the raw reference used for machining starts.
[9] Noyau selon l'une quelconque des revendications 5 à 8, 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. [9] Core according to any one of claims 5 to 8, characterized in that said one-piece core (1) is produced in a core box and is made up of compressed sand and agglomerated with a binder such as resin.
EP97932896A 1996-07-19 1997-07-11 Method and core for moulding an internal combustion engine cylinder head Expired - Lifetime EP0958076B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9609071 1996-07-19
FR9609071A FR2751251B1 (en) 1996-07-19 1996-07-19 PROCESS AND CORE FOR MOLDING A CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
PCT/FR1997/001273 WO1998003290A1 (en) 1996-07-19 1997-07-11 Method and core for moulding an internal combustion engine cylinder head

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EP0958076A1 true EP0958076A1 (en) 1999-11-24
EP0958076B1 EP0958076B1 (en) 2003-02-26

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EP (1) EP0958076B1 (en)
JP (1) JP2000514898A (en)
BR (1) BR9710505A (en)
DE (1) DE69719375T2 (en)
ES (1) ES2192689T3 (en)
FR (1) FR2751251B1 (en)
WO (1) WO1998003290A1 (en)

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Publication number Priority date Publication date Assignee Title
FR2792858B1 (en) * 1999-04-30 2001-05-25 Renault METHOD, DEVICE AND CORE FOR THE MOLDING OF A CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
FR2793174B1 (en) * 1999-05-07 2001-06-29 Renault METHOD AND DEVICE FOR MOLDING A CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
FR2823141B1 (en) * 2001-04-09 2003-06-27 Renault Sas PROCESS FOR MOLDING A HEAD
FR2848245B1 (en) 2002-12-10 2007-03-09 Renault Sa VALVE SEAT FOR INTERNAL COMBUSTION ENGINE CYLINDER HEAD
DE10339653A1 (en) * 2003-08-28 2005-03-24 Deutz Ag Casting core minimized cylinder head
US8997945B1 (en) 2003-09-24 2015-04-07 Kelsey-Hayes Company Brake caliper for disc brake assembly and method and apparatus for producing same
US7168529B2 (en) * 2003-09-24 2007-01-30 Kelsey-Hayes Company Brake caliper for disc brake assembly and method and apparatus for producing same
KR101163692B1 (en) 2006-11-14 2012-07-09 현대자동차주식회사 A combustion chamber insert mold of cylinder head
DE102012015328A1 (en) * 2012-08-01 2014-02-06 GM Global Technology Operations, LLC (n.d. Ges. d. Staates Delaware) Core, useful for casting device for casting component e.g. cylinder head of motor vehicle, comprises core elements, and fixing device that comprises first and second fixing units forming undercut in to the relative movement direction
DE102014204859A1 (en) * 2014-03-17 2015-09-17 Volkswagen Aktiengesellschaft Cylinder head component and method for producing such

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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 (en) * 1990-11-16 1998-08-05 AVL List GmbH Casting mold for cylinder block of a V-type internal combustion engine
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

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EP0958076B1 (en) 2003-02-26
FR2751251A1 (en) 1998-01-23
WO1998003290A1 (en) 1998-01-29
DE69719375D1 (en) 2003-04-03
BR9710505A (en) 1999-08-17
FR2751251B1 (en) 1998-08-21
JP2000514898A (en) 2000-11-07
DE69719375T2 (en) 2003-12-24
ES2192689T3 (en) 2003-10-16

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