EP0578705A1 - 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.

Info

Publication number
EP0578705A1
EP0578705A1 EP92907886A EP92907886A EP0578705A1 EP 0578705 A1 EP0578705 A1 EP 0578705A1 EP 92907886 A EP92907886 A EP 92907886A EP 92907886 A EP92907886 A EP 92907886A EP 0578705 A1 EP0578705 A1 EP 0578705A1
Authority
EP
European Patent Office
Prior art keywords
casting
mold
casting mold
parts
components
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
EP92907886A
Other languages
German (de)
English (en)
Other versions
EP0578705B1 (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
Original Assignee
EB BRUEHL ALUMINIUMTECHNIK GmbH
BRUEHL ALUMINIUMTECHNIK
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 EB BRUEHL ALUMINIUMTECHNIK GmbH, BRUEHL ALUMINIUMTECHNIK filed Critical EB BRUEHL ALUMINIUMTECHNIK GmbH
Publication of EP0578705A1 publication Critical patent/EP0578705A1/fr
Application granted granted Critical
Publication of EP0578705B1 publication Critical patent/EP0578705B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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

  • Aluminum alloy in particular a cylinder head
  • 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.
  • 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 locations which are subjected to high mechanical stress, 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 expanded due to heating in the form of a "shrink connection" frictionally stuck in the recess of the cylinder head.
  • 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 DE 39 37 402 AI a valve seat ring is also known which has 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 fact that in the manufacture of engine parts, in particular cylinder heads made of aluminum alloy, the introduction of components made of materials that are stronger and different from the base material of the engine part is simplified and the precision is improved.
  • This object is achieved in that the parts of the casting mold consist of a non-metallic material and that components to be firmly connected to the engine part to be cast are made of a different, higher melting material than the aluminum alloy when the parts are joined to form the complete casting mold inserted into these at predetermined fixing points and then the casting takes place.
  • This procedure takes advantage of the fact that such casting molds can today be manufactured with great precision in what is known as 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 high precision is possible in that the individual core parts are each formed in a core mold consisting of at least two molded parts, that after the molding process of the individual core parts has been completed, their shape is opened such that the core part remains connected to a molded part and then the individual core parts to be joined together with their shaped parts are joined together by defined relative movements of the shaped parts.
  • such a casting mold In the manufacture of engine blocks, cylinder heads or the like, such a casting mold, referred to above as the "core”, is composed of more than two core parts, so that the molded part for a core part defined as a basic core part remains connected to this as a carrier and centering element until all subsequent joining operations have been completed, in which the other core parts are placed on the base core part with the aid of their molded parts. Only then is the complete core, i.e. the complete casting mold, ejected from the carrier element.
  • 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 complete molding. It is advantageously used here that in a molding process in which the binder of the molding material or the core sand is activated not by temperature but by chemical-catalytic processes, the moldings of the individual molding machines have practically the same temperature and so there are no dimensional deviations individual moldings to each other due to thermal expansion.
  • valve seat rings with a conical shape of the outer surface.
  • This enables an optimal shape and dimension for the components, in particular for the valve seat rings.
  • these may have a larger outer diameter than previously, with an increase in diameter of only 1 mm already offering considerable advantages. Since such a valve seat ring is held in a form-fitting manner, it remains permanently connected to the cylinder head.
  • 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 possible because the entire joining process for the production of the casting mold is mechanized, so that it is also possible here to preheat components, in particular preheated valve seat rings, into the corresponding core part via a manipulator integrated in the course of the joining operations to insert. 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 the casting.
  • the components are heated electro-inductively after insertion into the casting mold.
  • 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, are wholly or partially assembled mold form the only metallic component. This also makes it possible to carry out the heating without contact, preferably immediately before the start of the casting process.
  • Component is necessary, is provided in a particularly advantageous embodiment of the method according to the invention, the components with a fully assembled mold to be heated electro-inductively from the outside. This ensures that the temperature influences on 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 therefore no changes in shape 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.
  • This has the advantage that, for example, inserted components made of ferrous materials can be heated up to the temperature of the melt to be poured in of about 800 ° C.
  • Another advantage of heating when the casting mold is completely assembled is that, depending on the position of the component to be cast in the casting mold, in particular in the case of molds above, casting can still be started during the heating phase, so that the desired final temperature for the heat to be heated Component is reached at the moment when contact with the melt occurs.
  • Fig. 1 shows the process flow in the form of a
  • Fig. 3 shows the finished cylinder head with a cast-in valve seat ring.
  • Cylinder head must be assembled from several core parts due to the many undercuts and channels.
  • the individual core parts are manufactured using separate core molding machines and then assembled.
  • the flow picture 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 molding box formed from two molded parts 1 and 2
  • a first core part 3 is produced in a customary 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.
  • a component 7 to be cast in, for example a valve seat ring is now placed 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, from the molded part 1, which has served as a centering and guiding means during the entire process , loosened and moved to the casting station VI and poured 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 up and then placed over the manipulator.
  • the temperature loss is up to the point in time when the valve seat ring with the melt is in Contact comes in, of minor importance.
  • valve seat rings to be cast in since cylinder heads represent relatively flat components which enable electro-inductive heating without excessive energy expenditure, i.e. from the outside, i.e. when the casting mold is already fully assembled and is 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. 2 shows, the outer surface of the valve seat ring 7 is conical, so that after removal of the casting mold, as shown schematically 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 , the end region directly facing the valve seat ring to be heated is provided with an iron core 13.
  • This form of heating is possible because the casting mold 3-4 overall, in addition to the inserted components, here the valve seat rings 7, has no metallic parts. Since the mold 3-4 is already completely closed at this point, the mold cavity 14 can first be flushed with a protective gas, for example nitrogen, so that the valve seat rings 7 can then be heated to temperatures up to 800 ° C. without oxidation. Because of the low mass, the valve seat rings can be heated up in a few seconds, so that casting can still be started during the heating process, so that the heating up phase
  • a protective gas for example nitrogen
  • FIGS. 2 and 3 The example of a cylinder head for an engine with four valves per cylinder, which is 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 5 is simplified.

Landscapes

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

Abstract

Dans les pièces de moteur en alliage d'aluminium, il faut fixer solidement des éléments en matériaux hautement résistants, par exemple des sièges de soupape rapportés sur des culasses de cylindre. Un traitement mécanique est long. L'invention propose un procédé pour le moulage d'une pièce de moteur en alliage d'aluminium au moyen d'un moule composé de plusieurs parties. Les éléments à fixer solidement à la pièce de moteur et qui sont constitués d'un autre matériau, dont la température de fusion correspond au moins à la température de fusion du matériau du moteur, en particulier des sièges de soupape rapportés, sont insérés dans le moule avant l'assemblage de ce dernier, en des points indiqués par des repères correspondants, ensuite le moule est assemblé, et seulement ensuite la pièce de moteur est coulée.
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 true EP0578705A1 (fr) 1994-01-19
EP0578705B1 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9218269A1 *

Also Published As

Publication number Publication date
DE59201300D1 (de) 1995-03-09
DE4111676A1 (de) 1992-10-15
EP0578705B1 (fr) 1995-01-25
WO1992018269A1 (fr) 1992-10-29
ATE117607T1 (de) 1995-02-15
JPH07500291A (ja) 1995-01-12

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