EP0578705B1 - Procede de moulage d'une piece de moteur en alliage d'aluminium, en particulier d'une culasse de cylindre - Google Patents

Procede de moulage d'une piece de moteur en alliage d'aluminium, en particulier d'une culasse de cylindre Download PDF

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Publication number
EP0578705B1
EP0578705B1 EP92907886A EP92907886A EP0578705B1 EP 0578705 B1 EP0578705 B1 EP 0578705B1 EP 92907886 A EP92907886 A EP 92907886A EP 92907886 A EP92907886 A EP 92907886A EP 0578705 B1 EP0578705 B1 EP 0578705B1
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EP
European Patent Office
Prior art keywords
casting
core
parts
die
mould
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
Application number
EP92907886A
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German (de)
English (en)
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EP0578705A1 (fr
Inventor
Herbert Schilling
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.)
VAW Motor GmbH
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VAW Motor GmbH
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Filing date
Publication date
Application filed by VAW Motor GmbH filed Critical VAW Motor GmbH
Publication of EP0578705A1 publication Critical patent/EP0578705A1/fr
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    • 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 invention relates to a method for casting an engine part, in particular a cylinder head, from aluminum alloy by means of a casting mold composed of several parts, the core parts of the casting mold consisting of a non-metallic molding material, components to be firmly connected to the engine part to be cast from another, higher-melting components Material as the aluminum alloy when the parts are assembled to form the complete casting mold are inserted into these at predetermined fixing points and then the casting takes place.
  • valve seat rings In the case of engine parts which are made from aluminum alloy, it is necessary to use components made of a different material at mechanically highly stressed points, for example on the valve seats of cylinder heads, which can withstand the stresses required here.
  • the arrangement of such valve seat rings has so far been carried out in such a way that a corresponding recess has been machined into the cylinder head at this point after the casting.
  • the valve seat rings to be used were strongly cooled, for example with liquid nitrogen, and then inserted into the recess, so that the valve seat ring, due to its expansion as a result of the heating in the form of a "shrink connection", is frictionally stuck in the recess in the cylinder head.
  • EP 0 268 656 A1 discloses a process for the production of molds for foundry purposes, in which individual core parts each remain in one of their mold parts after molding in individual molding machines and these are then combined with the core parts located therein. Inserting metallic components is not intended.
  • valve seat ring which has undercuts on its outside and which is to be cast as a blank to be reworked directly into the cylinder head.
  • undercuts on its outside and which is to be cast as a blank to be reworked directly into the cylinder head.
  • the invention is based on the object in the manufacture of engine parts, in particular cylinder heads made of aluminum alloy, to simplify the introduction of components made of materials other than the base material of the engine part and to improve the precision.
  • This object is achieved in a method according to the preamble of claim 1 in that each time after the molding process of the individual core parts, their shape is opened so that the core part remains connected to a molded part, that the components are inserted into an exposed core part and that the individual core parts to be joined together with their molded parts are joined together by defined relative movements of the molded parts.
  • This procedure takes advantage of the fact that such casting molds can today be manufactured with great precision in the so-called core molding technology.
  • the actual casting mold is made like a core from a flowable, hardenable molding material, the mold being composed of a total of several parts.
  • the individual core parts each consist of at least two molded parts
  • Core mold are formed by themselves, that each time after the molding process of the individual core parts, their shape is opened so that the core part remains connected to a molded part and then the individual core parts to be joined together with their molded parts are joined together by defined relative movements of the molded parts.
  • the core is composed of more than two core parts, so that the molded part for a core part defined as a base core part remains connected to the latter as a support and centering element until all subsequent ones Joining operations are completed, in which the other core parts are placed on the base core part with the help of their molded parts.
  • the complete core i.e. the complete casting mold, ejected from the carrier element. Since in this method the geometric assignment required for the joining and the resulting relative movement of the core parts to be joined to one another takes place through the corresponding alignment and movement of the molded parts relative to one another and no longer through the core parts themselves, the joining process can be carried out with great precision Carry out, since the core parts held in their molded part show a spatial orientation that can never be achieved after a complete molding.
  • the molded parts of the individual molding machines have practically the same temperature and so there are no dimensional deviations of the individual molded parts to each other due to thermal expansion.
  • the components are heated before being inserted into the casting mold. This avoids excessive temperature differences, which can have a negative effect on the structure of the aluminum alloy surrounding them.
  • This method is already possible because the entire joining process for the production of the casting mold is mechanized, so that it is also possible here to insert preheated components, in particular preheated valve seat rings, into the corresponding core part via a manipulator integrated in the course of the joining operations. Since the casting mold is made of a non-metallic molding material, there is only a relatively small outflow of heat until the start of casting.
  • the components are electro-inductively heated after being placed in the casting mold. This simplifies the insertion process, for example for the valve seat rings, since these can be handled at room temperature, whereas the heating process only takes place in a further station when the valve seat rings have already been inserted.
  • the electro-inductive heating of the components in the casting mold is possible because the casting mold as a whole does not consist of metal but only of mineral molding material or core sand, so that the components, in particular the valve seat rings, in the fully or partially assembled casting mold are the only metallic component represent. This also makes it possible to carry out the heating without contact, preferably immediately before the start of the casting process.
  • the components are provided with the mold fully assembled to be heated electro-inductively from the outside. This ensures that the temperature influences of the casting mold which are possible via the heat flow out of the heated component only take place when the casting mold is completely assembled and thus no shape changes can occur here.
  • This also enables a further advantageous embodiment of the method according to the invention, which consists in flushing the mold cavity of the casting mold with a protective gas before starting the heating.
  • Another advantage of heating when the mold is fully assembled is that, depending on the position of the component to be cast in the mold, especially in the case of molds above, casting can still be started during the heating phase, so that the desired final temperature for the component to be heated in the moment when contact with the melt occurs.
  • a mold made from core molding sand for a cylinder head must be assembled from several core parts because of the many undercuts and channels.
  • the individual core parts are manufactured using separate core molding machines and then assembled.
  • the flow diagram acc. 1 shows the process sequence in a simplified representation for a casting mold composed of only two core parts.
  • a core molding machine I which has a mold box formed from two mold parts 1 and 2
  • a first core part 3 is produced in a conventional manner, for example by the cold box process, from a corresponding molding sand.
  • the associated core part 4 which together with the core part 3 forms the complete casting mold, is produced in a second core molding machine II, which has a core mold composed of a molded part 5 and an associated molded part 6.
  • the core molds open, the core part 3 remaining in the mold part 1 in the core molding machine I and being moved into a first joining station III.
  • a component 7 to be cast in, for example a valve seat ring, is now placed on the exposed core part 3 with the aid of a manipulator.
  • the associated core part 4 which is still connected to the molded part 5, is now positioned by the core molding machine II and then lowered onto the core part 3 or that Core part 3 raised so that both core parts 3 and 4 are joined together to form the finished casting mold.
  • the molded part 5 is then detached from the core part 4 and in a further station V the finished casting mold 3-4, which now also encloses the inserted valve seat ring 7, is removed from the molded part 1, which has served as centering and guiding means during the entire process, and for Move casting station VI and cast there. After cooling, the casting mold is destroyed and the molding sand is reprocessed.
  • the valve seat ring 7 is expedient in the process sequence shown here first heated and then placed over the manipulator. Since the casting mold is made of a non-metallic material and the joining operation and the continuation of the complete casting mold up to the casting station VI take place in a short time, the temperature loss until the time the valve seat ring comes into contact with the melt is from of minor importance.
  • valve seat rings to be cast in since cylinder heads represent relatively flat components which allow electro-inductive heating without excessive energy expenditure, i.e. from the outside, i.e. when the mold is already fully assembled and in contact with the casting device.
  • the valve seat ring 7 is placed on a core mark 8 of the core part 3, so that when the casting mold 3-4 is closed, as shown in FIG. 1 for the station V, with an associated part 9 of the core part 4 the valve channel is kept clear and at the same time the valve seat blank is fixed in the casting mold.
  • the outer surface of the valve seat ring 7 is conical, so that after removal of the casting mold as shown in FIG. 3, it is held in a form-fitting manner in the finished casting 10.
  • the core part 3 has a downwardly open recess 11 into which a water-cooled induction coil 12 can be inserted, which in its, the valve seat ring to be heated directly facing end area is provided with an iron core 13.
  • a protective gas for example nitrogen
  • valve seat rings can be heated up in a few seconds so that casting can begin while the heating process is still running, so that the heating up phase at the desired end temperature only ends when the melt entering the mold comes into contact with the components to be poured, here the valve seat rings 7, comes into contact. Due to this overlap in time of the end of the heating phase on the one hand and the beginning of the casting phase on the other hand, a time reduction of the casting process which is desirable for series production can be achieved overall.
  • FIGS. 2 and 3 The embodiment of a cylinder head for an engine with four valves per cylinder, shown schematically in FIGS. 2 and 3, shows the considerable manufacturing advantage of the method. Since the valve blanks 7 are cast geometrically precisely in the desired assignment, the subsequent finishing is simplified.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (6)

  1. Procédé pour mouler une pièce de moteur, en particulier une culasse de cylindre, en alliage d'aluminium au moyen d'un moule constitué par plusieurs parties de noyau, dans lequel les parties de noyau (3, 4) du moule consistent en un matériau de moule non métallique, des éléments constitutifs (7) destinés à être reliés solidement à la pièce de moteur à mouler, en un matériau différent et à plus haut point de fusion que l'alliage d'aluminium, sont insérés en des points de fixation (8) prédéterminés dans les parties lors de l'assemblage de celles-ci en le moule complet, après quoi a lieu le moulage, caractérisé en ce qu'après la fin du processus de moulage des différentes parties de noyau (3, 4), leur moule (1, 2; 5, 6) est ouvert de telle manière que la partie de noyau (3, 4) reste liée à une partie de moule (1 ; 5), en ce que les éléments constitutifs (7) sont insérés dans une partie de noyau ouverte (3) et en ce que les différentes parties de noyau (3, 4) à assembler et leurs parties de moule (1 ; 5) sont assemblées par des mouvements relatifs définis des parties de moule (1 ; 5).
  2. Procédé selon la revendication 1, caractérisé en ce que les éléments constitutifs (7) sont chauffés avant l'insertion dans le moule.
  3. Procédé selon la revendication 1, caractérisé en ce que les éléments constitutifs (7) sont chauffés par induction électrique après l'insertion dans le moule.
  4. Procédé selon les revendications 1 et 3, caractérisé en ce que les éléments constitutifs (7) sont chauffés de l'extérieur par induction électrique tandis que le moule (3-4) est totalement assemblé.
  5. Procédé selon la revendication 4, caractérisé en ce que la cavité (14) du moule (3-4) est balayée par un gaz protecteur avant le début du chauffage.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le moulage commence dès avant la fin de la phase de chauffage.
EP92907886A 1991-04-10 1992-04-03 Procede de moulage d'une piece de moteur en alliage d'aluminium, en particulier d'une culasse de cylindre Expired - Lifetime EP0578705B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4111676 1991-04-10
DE4111676A DE4111676A1 (de) 1991-04-10 1991-04-10 Verfahren zum giessen eines motorblocks aus aluminiumlegierung
PCT/EP1992/000747 WO1992018269A1 (fr) 1991-04-10 1992-04-03 Procede de moulage d'une piece de moteur en alliage d'aluminium, en particulier d'une culasse de cylindre

Publications (2)

Publication Number Publication Date
EP0578705A1 EP0578705A1 (fr) 1994-01-19
EP0578705B1 true EP0578705B1 (fr) 1995-01-25

Family

ID=6429275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92907886A Expired - Lifetime EP0578705B1 (fr) 1991-04-10 1992-04-03 Procede de moulage d'une piece de moteur en alliage d'aluminium, en particulier d'une culasse de cylindre

Country Status (5)

Country Link
EP (1) EP0578705B1 (fr)
JP (1) JPH07500291A (fr)
AT (1) ATE117607T1 (fr)
DE (2) DE4111676A1 (fr)
WO (1) WO1992018269A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19612500A1 (de) * 1996-03-29 1997-10-02 Bleistahl Prod Gmbh & Co Kg Verfahren zur Herstellung von Zylinderköpfen für Verbrennungsmotoren
DE19703399A1 (de) * 1997-01-30 1998-08-06 Itt Mfg Enterprises Inc Verfahren zur Herstellung eines Gehäuseblocks für ein Hydraulikaggregat
DE19746167A1 (de) * 1997-10-18 1999-04-22 Volkswagen Ag Leichtmetallbauteil, Verfahren zu seiner Herstellung und Verwendung desselben
DE19852595A1 (de) * 1998-11-14 2000-05-18 Georg Fischer Disa Ag Verfahren und Anlage zur Herstellung von Gußstücken aus Aluminium mit Einlagen
DE10211053A1 (de) * 2002-03-13 2003-10-09 Vaw Ver Aluminium Werke Ag Verfahren zum Gießen von Zylinderkurbelgehäusen und Kernpaket für das Gießen von Zylinderkurbelgehäusen, Kernkasten und Kernpaket

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH251502A (fr) * 1944-03-18 1947-10-31 Mecanique Du Centre Societe An Procédé de fabrication d'une culasse de moteur en alliage léger, et culasse de moteur obtenue par ce procédé.
FR1238335A (fr) * 1959-06-29 1960-08-12 Hispano Suiza Sa Perfectionnements apportés aux pièces en métal léger, notamment aux culasses de moteur, devant comporter des inclusions métalliques, et aux procédés pour leur élaboration
JPS57115964A (en) * 1981-01-08 1982-07-19 Kubota Ltd Insert casting method for steel core
US4691754A (en) * 1985-12-31 1987-09-08 Deere & Company Method for forming castings having inserts
JPS6415262A (en) * 1987-07-09 1989-01-19 Nissan Motor Method for casting cylinder block inserting cylinder liner as cast-in

Also Published As

Publication number Publication date
EP0578705A1 (fr) 1994-01-19
DE4111676A1 (de) 1992-10-15
WO1992018269A1 (fr) 1992-10-29
JPH07500291A (ja) 1995-01-12
DE59201300D1 (de) 1995-03-09
ATE117607T1 (de) 1995-02-15

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