EP0890020A1 - Process for producing cylinder heads for internal combustion engines - Google Patents

Process for producing cylinder heads for internal combustion engines

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Publication number
EP0890020A1
EP0890020A1 EP97916394A EP97916394A EP0890020A1 EP 0890020 A1 EP0890020 A1 EP 0890020A1 EP 97916394 A EP97916394 A EP 97916394A EP 97916394 A EP97916394 A EP 97916394A EP 0890020 A1 EP0890020 A1 EP 0890020A1
Authority
EP
European Patent Office
Prior art keywords
valve
cylinder head
valve seat
mold
guides
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
EP97916394A
Other languages
German (de)
French (fr)
Other versions
EP0890020B1 (en
Inventor
Gerd Krüger
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.)
Bleistahl Produktions-GmbH and Co KG
Original Assignee
Bleistahl Produktions-GmbH and Co KG
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Publication of EP0890020A1 publication Critical patent/EP0890020A1/en
Application granted granted Critical
Publication of EP0890020B1 publication Critical patent/EP0890020B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats

Definitions

  • the invention relates to a method for producing cylinder heads for internal combustion engines according to the preamble of patent claim 1.
  • valve seat ring The known method of pulling in valve seats or hollow cylindrical valve guides requires considerable manufacturing outlay, e.g. B. machining of valve seat ring, Vent i If ⁇ h tion and cylinder head in order to comply with the necessary installation tolerances, and also correct positioning before installing the rings or valve guides in the cylinder head.
  • manufacturing outlay e.g. B. machining of valve seat ring, Vent i If ⁇ h tion and cylinder head in order to comply with the necessary installation tolerances, and also correct positioning before installing the rings or valve guides in the cylinder head.
  • a surface treatment e.g. B. by Läserumschme or alloy, considerable amounts of energy are required, which makes this method appear very uneconomical with an efficiency of 3%.
  • ASSEMBLY COPY Pour high density into the cylinder heads, however, there is no intimate connection between the cylinder head material and the valve seat ring (DE 39 37 402 A1). Essentially, the ring in the cylinder head only holds by mechanical clamping, as a result of which there is no intimate contact with the cylinder head and there is therefore a risk of the rings falling out.
  • This solution also has the disadvantage of an oxidized transition from the valve seat ring to the cylinder head; the resulting layer has an insulating effect and prevents a high conductive heat transfer.
  • the invention will remedy these disadvantages.
  • the object of the invention is accordingly to develop a solution for the design of cylinder heads in which by direct pouring of valve seats and valve guides the manufacturing outlay can be reduced and yet an intimate connection of the vent can be achieved and the valve guides on the cylinder head material, thus increasing the thermal conductivity.
  • Valve seat rings and valve guides with an open Pore volumes of 5 to 15% are used.
  • liquid aluminum penetrates into the pores of the tempered Venti seat rings and Venti l guides and fills them. This creates an intimate connection between the two materials.
  • the thermal conductivity of the materials increases by the proportion of infiltrated aluminum.
  • an insulating intermediate layer in the area of the cylinder head and valve seat or valve guide is avoided, as a result of which the heat conduction from the above-mentioned component to the cooling circuit in the cylinder head is increased. Machining steps, both in cylinder head machining and in the manufacture of valve seat rings or valve guides, can be dispensed with.
  • the invention also offers the possibility of using ceramic materials based on iron or copper instead of conventional seat ring and guide materials, which are specifically designed for infiltration through liquid light metals.
  • Liquid aluminum can be poured into the mold either under gravity or under pressure, optionally with variable pressure ratios.
  • valve seat rings and valve guides it is advisable to heat valve seat rings and valve guides before pouring. This can be done either after inserting it with the mold or before inserting it into the mold. According to an advantageous further education, it is possible to adjust the pore volume of valve seat rings and valve guides in a graded manner, ie that the area with high thermal and mechanical loads has a smaller pore volume, eg. B. of ⁇ 2%, while the areas towards the cylinder head have a pore volume in the above-described limit range.
  • valve seats and / or valve guides can be generated during a repressing process.
  • Fig. 1 a tendon at the i c ht of a cylinder head in
  • Fig is a schematic diagram for the production of graded porosity.
  • the drawing shows a section of a section in the area of an intake or exhaust port of a cylinder head after the casting process.
  • the casting core 2 with stepped sections has not yet been removed from the solidified aluminum melt 1.
  • the casting core 2 contains an upper cylindrical section 3 and below it a second cylindrical section 4 with a larger diameter.
  • the transition between the two sections 3, 4 forms a flat annular shoulder 5, while the second section 4 connects at its lower end via an annular shoulder 6 to the outer lateral surface of the cylindrical casting core 2.
  • a prefabricated valve guide 7 is placed on the upper section 3 and a prefabricated valve seat ring 8 is placed on the lower section 4.
  • a prefabricated valve guide 7 is placed on the upper section 3 and a prefabricated valve seat ring 8 is placed on the lower section 4.
  • the corner region between the cylindrical section 4 and the annular shoulder 6 is designed in accordance with the contour of the valve seat ring 8.
  • valve 8 and the valve guide 7 are manufactured with an open pore volume of 5 to 15% and preheated before insertion.
  • liquid aluminum penetrates into the pores of the temperature-controlled valve rings and guides 8, 7 and fills them. What is important here is the even distribution of the filled pores and sufficient basic strength of the components to be poured in.
  • the pore volume of the valve components in a graded manner, ie. that is, the area with the high thermal and mechanical stress has a pore volume of ⁇ 2%, while the area towards the cylinder head has a pore volume in the limit range described above. This can be achieved by different degrees of compression during a subsequent pressing process, which is explained below with reference to the schematic representation in FIG. 2.
  • a powder mixture consisting of a mixture specially composed for valve seat rings Egg-based alloying is pressed in a mold 9 to a density of, for example, 6.4 to 6.8 g / cm 3 in accordance with stage 1 of FIG. 2 with a stamp 10 to form a body 11 with an inclined surface.
  • This green body is then sintered in a stage 2 at a temperature between 900 and 1200 ° C.
  • the sintered blank is obtained in a stage 3 with the aid of a stamp 12, after which only a geometrically predetermined area of the ring is deformed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

PCT No. PCT/EP97/01540 Sec. 371 Date Sep. 28, 1998 Sec. 102(e) Date Sep. 28, 1998 PCT Filed Mar. 26, 1997 PCT Pub. No. WO97/37107 PCT Pub. Date Oct. 9, 1997The cylinder head for internal combustion engines is produced by pouring liquid cylinder head material, especially aluminum, into a cylinder head mold containing a mold core having stepped sections in the region of the valve seat ring and the valve guide. The valve seat rings and valve guides are produced from a conventional material based on steel or copper by pressing and sintering in such a way that they have an open pore volume of 5 to 15%, a valve seat and/or a valve guide are laid on the stepped sections of the mold core, whereafter liquid aluminum is poured into the preheated mold and the mold core is removed in the conventional way after the molten aluminum has solidified.

Description

Verfahren zur Herstellung von Zylinderköpfen für VerbrennungsmotorenProcess for the production of cylinder heads for internal combustion engines
Beschrei bungDescription
Die Erfindung betrifft ein Verfahren zur Herstellung von Zy l i nde rköpfen für Verbrennungsmotoren gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for producing cylinder heads for internal combustion engines according to the preamble of patent claim 1.
Bei der Herstellung von Zylinderköpfen ist es zur Zeit bekannt, in den fertig gegossenen Zylinderkopf aus Aluminium oder Grauguß Vent i l s i t z r i nge und Vent i l füh rungen mit einer bestimmten Gebrauchsdichte in entsprechende Bohrungen des Zylinderkopfes einzuziehen. Daneben gibt es Bestrebungen, den Zy l i nderköpfwe rkstoff der Ve rt i l s i t zobe rf l ä ehe zu behandeln, um den hohen motorischen Beanspruchungen gerecht zu werden.In the manufacture of cylinder heads, it is known at the moment to draw valve seats and valve guides with a certain usage density into corresponding bores of the cylinder head into the cast aluminum head or cast iron cylinder head. In addition, there are efforts to treat the cylinder head material of the distribution system in order to meet the high engine stresses.
Die bekannte Methode, Vent i l s i tz ri nge bzw. hohizylindrische Vent i L füh rungen einzuziehen, erfordert einen erheblichen fertigungstechnischen Aufwand, z. B. spanende Bearbeitung von Venti lsitzring, Vent i Ifύh rung und Zylinderkopf, um die notwendigen Einbautoleranzen einzuhalten, und ferner eine lagerichtige Positionierung vor dem Einbau der Ringe bzw. Ventilführungen in den Zylinderkopf. Bei einer Oberflächenbehandlung, z. B. durch Läserumschme lzen oder -legieren, werden erhebliche Mengen an Energie benötigt, die diese Methode bei einem Wirkungsgrad des Lasers von 3 % als sehr unwirtschaftlich erscheinen läßt .The known method of pulling in valve seats or hollow cylindrical valve guides requires considerable manufacturing outlay, e.g. B. machining of valve seat ring, Vent i Ifύh tion and cylinder head in order to comply with the necessary installation tolerances, and also correct positioning before installing the rings or valve guides in the cylinder head. With a surface treatment, e.g. B. by Läserumschme or alloy, considerable amounts of energy are required, which makes this method appear very uneconomical with an efficiency of 3%.
Es hat auch Bestrebungen gegeben, Vent i l s i t z r i nge mitThere have also been efforts to ventilate with
BESfrlGUNGSKOPIE hoher Dichte in Zylinderköpfe einzugießen, hierbei entsteht jedoch zwischen Zy l i nde rkopfmate r i a l und Vent i l s i t z r i ng keine innige Verbindung (DE 39 37 402 A1 ) . Im wesentlichen hält der Ring im Zylinderkopf nur durch mechanische Verklammerung, wodurch kein inniger Kontakt zum Zylinderkopf vorhanden ist und somit die Gefahr besteht, daß die Ringe herausfallen. Auch hat diese Lösung den Nachtei l eines oxydierten Überganges vom Vent i l s i tz ri ng zum Zylinderkopf; die dabei entstehende Schicht wirkt isolierend und verhindert einen hohen leitenden Wä rmeübe rgang .ASSEMBLY COPY Pour high density into the cylinder heads, however, there is no intimate connection between the cylinder head material and the valve seat ring (DE 39 37 402 A1). Essentially, the ring in the cylinder head only holds by mechanical clamping, as a result of which there is no intimate contact with the cylinder head and there is therefore a risk of the rings falling out. This solution also has the disadvantage of an oxidized transition from the valve seat ring to the cylinder head; the resulting layer has an insulating effect and prevents a high conductive heat transfer.
Die Erfindung wi ll diesen Nachtei len abhelfen. Die Aufgabe der Erfindung besteht dementsprechend darin, für die Gestaltung von Zylinderköpfen eine Lösung zu entwickeln, bei der durch di rektes Eingießen von Vent i l s i tz ri ngen und Vent i l füh rungen der fertigungstechnische Aufwand verringert werden kann und bei der dennoch eine innige Anbindung der Vent i l s i t z r i nge und der Vent i l füh rungen an das Zy l i nde rkopfmate r i a l und damit eine Erhöhung der thermischen Leitfähigkeit erzielbar ist.The invention will remedy these disadvantages. The object of the invention is accordingly to develop a solution for the design of cylinder heads in which by direct pouring of valve seats and valve guides the manufacturing outlay can be reduced and yet an intimate connection of the vent can be achieved and the valve guides on the cylinder head material, thus increasing the thermal conductivity.
Die Lösung dieser Aufgabe besteht erfindungsgemäß in einem Verfahren zur Herstellung von Zylinderköpfen für Verbrennungsmotoren gemäß den Merkmalen im Kennzeichen des Anspruchs 1.This object is achieved, according to the invention, in a method for producing cylinder heads for internal combustion engines according to the features in the characterizing part of claim 1.
Vortei lhafte Weiterbi ldungen ergeben sich aus den Unteransprüchen.Advantageous further training results from the subclaims.
Für das erfindungsgemäße Verfahren werdenFor the method according to the invention
Vent i l s i t z r i nge und Vent i l füh rungen mit einem offenen Porenvolumen von 5 bis 15 % eingesetzt. Während des Gießvorganges des Zy L i nde rkopfes , z. B. durch Niederdruckguß, dringt flüssiges Aluminium in die Poren der temperierten Venti lsitzringe und Venti lführungen und füllt diese aus. Hierbei erfolgt eine innige Verbindung beider Werkstoffe. Wird als Zylinderkopfmaterial Aluminium verwendet, so erhöht sich die Wärmeleitfähigkeit der Werkstoffe um den Antei l des infi ltrierten Aluminiums. Zusätzlich wi rd eine isolierende Zwischenschicht im Bereich Zylinderkopf und Vent i l s i tz r i ng bzw. Vent i l füh rung vermieden, wodurch die Wärmeleitung vom vorgenannten Bautei l zum Küh lk rei s lauf im Zylinderkopf erhöht wi rd. Auf spanende Fertigungsschritte, sowohl bei der Zy l i nderkopfbea rbei tung als auch bei der Herstellung der Vent i l s i tz r i nge bzw. Vent i l füh rungen, kann verzichtet werden.Valve seat rings and valve guides with an open Pore volumes of 5 to 15% are used. During the casting process of the Zy L i nde rkopfes, z. B. by low pressure casting, liquid aluminum penetrates into the pores of the tempered Venti seat rings and Venti l guides and fills them. This creates an intimate connection between the two materials. If aluminum is used as the cylinder head material, the thermal conductivity of the materials increases by the proportion of infiltrated aluminum. In addition, an insulating intermediate layer in the area of the cylinder head and valve seat or valve guide is avoided, as a result of which the heat conduction from the above-mentioned component to the cooling circuit in the cylinder head is increased. Machining steps, both in cylinder head machining and in the manufacture of valve seat rings or valve guides, can be dispensed with.
Die Erfindung bietet auch die Möglichkeit, anstelle konventioneller Sitzring- und Führungswerkstoffe auf der Basis von Eisen bzw. Kupfer keramische Werkstoffe einzusetzen, die speziell für die Infiltration durch flüssige Leichtmetalle konzipiert sind.The invention also offers the possibility of using ceramic materials based on iron or copper instead of conventional seat ring and guide materials, which are specifically designed for infiltration through liquid light metals.
Das Eingießen von flüssigem Aluminium in die Form kann entweder unter Schwerkraft oder unter Druck, gegebenenfalls mit variablen Druckverhältnissen vorgenommen werden.Liquid aluminum can be poured into the mold either under gravity or under pressure, optionally with variable pressure ratios.
Es ist zweckmäßig, Venti lsitzringe und Venti lführungen vor dem Eingießen zu erwärmen. Dies kann entweder nach dem Einlegen zusammen mit der Gußform oder vor dem Einlegen in die Gußform vorgenommen werden. Gemäß einer vortei lhaften Weiterbi ldung besteht die Möglichkeit, das Porenvolumen von Vent i l s i t z r i ngen und Vent i l füh rungen gradiert einzustellen, d. h., daß der Bereich mit hohen thermischen und mechanischen Belastungen ein geringeres Porenvolumen, z. B. von < 2 % aufweist, während die Bereiche zum Zylinderkopf hin ein Porenvolumen im vorstehend beschriebenen Grenzbereich besitzen.It is advisable to heat valve seat rings and valve guides before pouring. This can be done either after inserting it with the mold or before inserting it into the mold. According to an advantageous further education, it is possible to adjust the pore volume of valve seat rings and valve guides in a graded manner, ie that the area with high thermal and mechanical loads has a smaller pore volume, eg. B. of <2%, while the areas towards the cylinder head have a pore volume in the above-described limit range.
Gemäß einer anderen vortei lhaften Weiterbi ldung können unterschiedliche Verdichtungsgrade in den Vent i l s i tz r i ngen und/oder Vent i l füh rungen während eines Nachpreßvo rganges erzeugt werden.According to another advantageous further development, different degrees of compression in the valve seats and / or valve guides can be generated during a repressing process.
Die Erfindung wird nachfolgend an einem in der Zeichnung dargestellten Ausführungsbeispiel näher er läutert . Es zeigt:The invention is explained in more detail using an exemplary embodiment shown in the drawing. It shows:
Fig. 1 eine Sehn i tt ans i c ht eines Zy l i nde rkopfes imFig. 1 a tendon at the i c ht of a cylinder head in
Bereich einer Vent i l füh rung mit Vent i l s i t z r i ng und Vent i l füh rung undArea of a valve guide with valve system and valve guide and
Fig eine Prinzipskizze zur Herstellung gradierter Porosität.Fig is a schematic diagram for the production of graded porosity.
Die Zeichnung zeigt als Ausschnitt einen Schnitt im Bereich eines Einlaß- oder Auslaßkanals eines Zylinderkopfes nach dem Gießvorgang. Aus der erstarrten Aluminiumschmelze 1 ist der Gießkern 2 mit abgestuften Abschnitten noch nicht entfernt. Der Gießkern 2 enthält einen oberen zylindrischen Abschnitt 3 und darunter einen zweiten zylindrischen Abschnitt 4 mit größerem Durchmesser. Den Übergang zwischen den beiden Abschnitten 3, 4 bi ldet eine ebene Ringschulter 5, während der zweite Abschnitt 4 an seinem unteren Ende über eine Ringschulter 6 an die äußere Mantelfläche des zylindrischen Gießkernes 2 anschließt.The drawing shows a section of a section in the area of an intake or exhaust port of a cylinder head after the casting process. The casting core 2 with stepped sections has not yet been removed from the solidified aluminum melt 1. The casting core 2 contains an upper cylindrical section 3 and below it a second cylindrical section 4 with a larger diameter. The transition between the two sections 3, 4 forms a flat annular shoulder 5, while the second section 4 connects at its lower end via an annular shoulder 6 to the outer lateral surface of the cylindrical casting core 2.
Vor dem Gießvorgang wird auf den oberen Abschnitt 3 eine vorgefertigte Vent i l füh rung 7 und auf den unteren Abschnitt 4 ein vorgefertigter Venti ls itzring 8 aufgelegt. Wie die Zeichnung zeigt, ist der Eckbereich zwischen dem zylindrischen Abschnitt 4 und der Ringschulter 6 entsprechend der Kontur des Venti lsitzringes 8 ausgebi ldet.Before the casting process, a prefabricated valve guide 7 is placed on the upper section 3 and a prefabricated valve seat ring 8 is placed on the lower section 4. As the drawing shows, the corner region between the cylindrical section 4 and the annular shoulder 6 is designed in accordance with the contour of the valve seat ring 8.
Vent i L s i t z r i ng 8 und Vent i l füh rung 7 werden mit einem offenen Porenvolumen von 5 bis 15 % hergestellt und vor dem Einlegen vorgewärmt. Während des Gießvorganges des Zy l i nde rkopfes dringt flüssiges Aluminium in die Poren der temperierten Vent i l s i t z ri nge und -führungen 8, 7 und füllt diese aus. Wichtig ist dabei die gleichmäßige Vertei lung der gefüllten Poren sowie eine ausreichende Grundfestigkeit der einzugießenden Bautei le.The valve 8 and the valve guide 7 are manufactured with an open pore volume of 5 to 15% and preheated before insertion. During the casting process of the cylinder head, liquid aluminum penetrates into the pores of the temperature-controlled valve rings and guides 8, 7 and fills them. What is important here is the even distribution of the filled pores and sufficient basic strength of the components to be poured in.
Bei Bedarf besteht die Möglichkeit, das Porenvolumen der Vent i lt ri ebskomponenten gradiert einzustellen, d. h., daß der Bereich mit der hohen thermischen und mechanischen Beanspruchung ein Porenvolumen von < 2 % aufweist, während der Bereich zum Zylinderkopf hin ein Porenvolumen im vorstehend beschriebenen Grenzbereich besitzt. Dies kann erreicht werden durch unterschiedliche Verdichtungsgrade während eines Na chpreßvo rganges, der nachfolgend anhand der schematischen Darstellung in Fig. 2 erläutert wird.If necessary, it is possible to adjust the pore volume of the valve components in a graded manner, ie. that is, the area with the high thermal and mechanical stress has a pore volume of <2%, while the area towards the cylinder head has a pore volume in the limit range described above. This can be achieved by different degrees of compression during a subsequent pressing process, which is explained below with reference to the schematic representation in FIG. 2.
Eine Pulvermischung, bestehend aus einer für Vent i l s i t z r i nge speziell zusammengesetzten Ei senbasi s Leg i erung , wird in einer Form 9 auf eine Dichte von beispielsweise 6,4 bis 6,8 g/cm3 entsprechend Stufe 1 der Fig. 2 mit einem Stempel 10 zu einem Körper 11 mit geneigter Oberfläche vorgepreßt. Anschließend wird dieser Grünling in einer Stufe 2 bei einer Temperatur zwischen 900 und 1200 °C gesintert. Der gesinterte Rohling erhält in einer Stufe 3 mit Hi lfe eines Stempels 12 eine Na chverdi chtung , wobei nur ein geometrisch vorbestimmter Bereich des Ringes verformt wird. Damit ergibt sich bei entsprechenden Preßdrücken ein Körper 13 mit einem Dichtegradienten vom unverformten Bereich (Dichte 6,4 bis 6,8 g/cm3 ) zum verformten Bereich (Dichte > 7,2 g/cm3) . Der Bereich mit der niedrigen Dichte, d. h. der radial äußere Bereich eines Vent i l s i t z r i nges, bi ldet die spätere Kontaktf läehe mit dem Zylinderkopf, wahrend der radial innere Bereich des Vent i l s i t z r i nges mit der hohen Dichte die spätere Funktionsfläche darstellt. A powder mixture consisting of a mixture specially composed for valve seat rings Egg-based alloying, is pressed in a mold 9 to a density of, for example, 6.4 to 6.8 g / cm 3 in accordance with stage 1 of FIG. 2 with a stamp 10 to form a body 11 with an inclined surface. This green body is then sintered in a stage 2 at a temperature between 900 and 1200 ° C. The sintered blank is obtained in a stage 3 with the aid of a stamp 12, after which only a geometrically predetermined area of the ring is deformed. With corresponding pressing pressures, this results in a body 13 with a density gradient from the undeformed area (density 6.4 to 6.8 g / cm 3 ) to the deformed area (density> 7.2 g / cm 3 ). The area with the low density, ie the radially outer area of a valve seat ring, forms the later contact surface with the cylinder head, while the radially inner area of the valve seat ring with the high density represents the later functional surface.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung von Zy l i nde rköpfen für Verbrennungsmotoren durch Vergießen des flüssigen1. Process for producing cylinder heads for internal combustion engines by pouring the liquid
Zy l i nderkopfmateri a ls, insbesondere Aluminium, in eine Zylinderkopfform, die einen Gießkern enthält, der abgestufte Abschnitte im Bereich des Vent i l s i t z ri nge s und der Vent i l füh rung aufweist, dadurch gekennzeichnet, daß Venti lsitzringe (8) und Vent i l füh rungen (7) aus einem für deren Herstellung üblichen Werkstoff auf Eisen- oder Kupfer-Basis durch Pressen und Sintern derart hergestellt werden, daß sie ein offenes Porenvolumen von 5 bis 15 '/. aufweisen, daß je ein Venti lsitzring (8) und/oder je eine Venti lführung (7) auf die abgestuften Abschnitte (4, 3) des Gießkernes (2) aufgelegt werden, daß anschließend flüssiges Aluminium in die vorgewärmte Gußform eingegossen wird und daß nach dem Erstarren der Aluminiumschmelze (1) der Gießkern (2) in üblicher Weise entfernt wird.Cylinder head material, in particular aluminum, into a cylinder head shape which contains a casting core which has stepped sections in the region of the valve seat rings and the valve guide, characterized in that valve seat rings (8 ) and valve guide stanchions (7) from a common material for their production of iron or copper based by pressing and sintering such that they have an open pore volume of 5 to 15 '/. have that a Venti lsitzring (8) and / or a Venti lführung (7) are placed on the stepped portions (4, 3) of the casting core (2), that liquid aluminum is then poured into the preheated mold and that after the solidification of the aluminum melt (1) the casting core (2) is removed in the usual way.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß flüssiges Aluminium unter Schwerkraft oder Druck in die Form eingegossen wird.2. The method according to claim 1, characterized in that liquid aluminum is poured into the mold under gravity or pressure.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Eingießen des flüssigen Aluminiums unter variablen D ruckve rhä ltni ssen vorgenommen wird.3. The method according to claim 1 or 2, characterized in that the pouring of the liquid aluminum is carried out under variable pressure rhä ltni ssen.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Gußform einschließlich Vent i lsi tz ri nge (8) und Vent i l füh rungen (7) vor dem Gießen erwärmt wird. 4. The method according to any one of claims 1 to 3, characterized in that the mold including Vent i lsi tz ri nge ( 8 ) and Vent il guides (7) is heated before casting.
5. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Venti lsitzringe (8) und5. The method according to any one of claims 1 to 3, characterized in that the valve seat rings (8) and
Vent i l füh rungen (7) vor dem Einlegen in die Gußform e rwä rmt we rden .Valve guides (7) must be warmed up before inserting them into the mold.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß bei der Herstellung der6. The method according to any one of claims 1 to 5, characterized in that in the manufacture of the
Vent i l s i tz r i nge (8) und/oder Vent i l füh rungen (7) durch unterschiedliche Verdichtungsgrade in Bereichen mit hohen thermischen und mechanischen Belastungen ein Porenvolumen von < 2 % erzeugt wi rd.Valve rings (8) and / or valve guides (7) a pore volume of <2% is generated by different degrees of compression in areas with high thermal and mechanical loads.
7. Verfahren nach Anspruch 6, dadurch gekennzei chnet, daß während eines Na chp reßvo rgange s unterschiedliche Verdichtungsgrade in den Vent i l s i t z r i ngen (8) und/oder Vent i l füh rungen (7) erzeugt werden. 7. The method according to claim 6, characterized gekennzei chnet that different degrees of compression in the Vent i l s i t z r i ngen (8) and / or Vent i l guides (7) are generated during a Na chp reßvo rgange s.
EP97916394A 1996-03-29 1997-03-26 Process for producing cylinder heads for internal combustion engines Expired - Lifetime EP0890020B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19612500 1996-03-29
DE19612500A DE19612500A1 (en) 1996-03-29 1996-03-29 Process for the production of cylinder heads for internal combustion engines
PCT/EP1997/001540 WO1997037107A1 (en) 1996-03-29 1997-03-26 Process for producing cylinder heads for internal combustion engines

Publications (2)

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EP0890020A1 true EP0890020A1 (en) 1999-01-13
EP0890020B1 EP0890020B1 (en) 2000-01-05

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US (1) US6112803A (en)
EP (1) EP0890020B1 (en)
JP (1) JP2000507504A (en)
KR (1) KR20000005112A (en)
AT (1) ATE188537T1 (en)
DE (2) DE19612500A1 (en)
ES (1) ES2144312T3 (en)
PT (1) PT890020E (en)
WO (1) WO1997037107A1 (en)

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US6622775B2 (en) 2000-05-10 2003-09-23 Consolidated Engineering Company, Inc. Method and apparatus for assisting removal of sand moldings from castings
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AU2001280541A1 (en) 2000-07-17 2002-01-30 Consolidated Engineering Company, Inc. Methods and apparatus for utilization of chills for castings
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Also Published As

Publication number Publication date
EP0890020B1 (en) 2000-01-05
JP2000507504A (en) 2000-06-20
ES2144312T3 (en) 2000-06-01
PT890020E (en) 2000-06-30
DE19612500A1 (en) 1997-10-02
KR20000005112A (en) 2000-01-25
DE59700975D1 (en) 2000-02-10
ATE188537T1 (en) 2000-01-15
WO1997037107A1 (en) 1997-10-09
US6112803A (en) 2000-09-05

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