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EP0272471A2 - Process and mould for manufacturing a cast iron object, and object thus produced - Google Patents

Process and mould for manufacturing a cast iron object, and object thus produced Download PDF

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Publication number
EP0272471A2
EP0272471A2 EP87117268A EP87117268A EP0272471A2 EP 0272471 A2 EP0272471 A2 EP 0272471A2 EP 87117268 A EP87117268 A EP 87117268A EP 87117268 A EP87117268 A EP 87117268A EP 0272471 A2 EP0272471 A2 EP 0272471A2
Authority
EP
European Patent Office
Prior art keywords
glass
cast iron
mold core
casting
mold
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
EP87117268A
Other languages
German (de)
French (fr)
Other versions
EP0272471A3 (en
EP0272471B1 (en
Inventor
Rudi Hass
Georg Dipl.-Ing. Jansen
Wilhelm Kallen
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.)
EISENGIESSERIE MONFORTS GMBH & CO
Original Assignee
A Monforts GmbH and Co
Eisengiesserei Monforts GmbH and Co
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
Family has litigation
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Application filed by A Monforts GmbH and Co, Eisengiesserei Monforts GmbH and Co filed Critical A Monforts GmbH and Co
Priority to AT87117268T priority Critical patent/ATE79064T1/en
Publication of EP0272471A2 publication Critical patent/EP0272471A2/en
Publication of EP0272471A3 publication Critical patent/EP0272471A3/en
Application granted granted Critical
Publication of EP0272471B1 publication Critical patent/EP0272471B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • 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
    • B22C9/101—Permanent cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B22C1/12—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for manufacturing permanent moulds or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/064—Locating means for cores
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
    • Y10T428/1317—Multilayer [continuous layer]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/232—Encased layer derived from inorganic settable ingredient
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/239—Complete cover or casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
    • Y10T428/2996—Glass particles or spheres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams

Definitions

  • the invention relates to a method for casting a cast iron body with a cavity formed with the aid of a mandrel. It also relates to a method of casting a cast iron camshaft having an elongated cavity for use in an internal combustion engine. The invention also relates to a casting mold with a mold core in the iron foundry and a cast iron body.
  • an elongated cast iron part is to be cast as a hollow body with a correspondingly elongated passage, a core must be made and inserted into the mold into which the molten iron is to be poured.
  • GB-PS 11 91 202 it is proposed to use a steel tube with a steel rod inserted therein and coated with insulating material as the mold core. In this process, liquid iron is poured into the mold and then the steel rod is pulled out of the steel tube that becomes part of the cast body.
  • a major disadvantage of this procedure is that a very hard, difficult-to-drill quench layer is formed at the boundary between the steel and the cast iron. The effort for the steel pipe is considerable.
  • the mandrel consists of a tubular steel core wound with ceramic paper or similar insulating material.
  • the ceramic paper forms an insulating layer between the melt poured into the mold and the much cooler steel tube.
  • the insulating layer is the one that flows in during casting Iron melt used up, e.g. B. burned, so that the inner metal tube can be pulled out of the cast body after it solidifies. It is very troublesome to wrap each mold core with the intended insulating material before it is introduced into the mold, moreover the surface of the winding does not become completely flat, so that the inner surface of the through opening of the cast iron piece to be manufactured has to be reworked.
  • the invention has for its object to provide a method for producing a hollow cast iron body, in particular a hollow cast camshaft, i.e. a cast iron body thin relative to the length, which allows hollow bodies without a casting opening or hollow bodies with very thin, for example, only for oil supply to bearings suitable through openings or blind holes as well as hollow bodies to cast with, for example weight-reducing, relatively thick cylindrical and / or adapted to the outer contour of the workpiece cavity relative to the workpiece outer diameter.
  • the inner surface of the cast part if and insofar as it is attainable or of importance, should correspond to the surface quality of a mechanical bore without substantial reworking, after all a problem-free handling should also be possible in the practice of a foundry.
  • the object underlying the invention is to create a casting mold for the iron foundry with a mold core which, without support from the central region of its length, can also be used with length / diameter ratios of the core of up to 500 mm / 5 mm .
  • a hollow cast workpiece made of cast iron is to be created by the invention.
  • the solution according to the invention for the method for casting a cast iron body with a cavity formed with the aid of a mold core is that a mold core made of glass is completely enclosed in the cast iron body.
  • a casting mold with a mold core in the iron foundry is characterized in that a mold core made of glass is completely enclosed by the cast iron body to be produced.
  • the cast iron body itself is characterized by a cavity which is enclosed on all sides during casting and on the inner contour of which glass, in particular quartz material, bears.
  • the solution according to the invention consists in that a mold core made of glass is used during casting.
  • the mold core provided according to the invention can be a smooth cylindrical or also a have a contoured surface for stability, weight or the like. Improvements and further refinements of the invention are specified in the subclaims.
  • the invention provides a casting method and a casting mold with a rod-like elongated mold core, which allow an elongated workpiece to be cast as a hollow body in the iron foundry, without substantial reworking of the inner contour being necessary and without quenching layers or the like which are difficult to pierce in the workpiece arise.
  • the method and the shape with a glass tube as the mold core are particularly well suited for producing a camshaft, which is known to be relatively thin for its length, but is said to have a partially or completely continuous longitudinal cavity for reasons of weight savings or as an oil supply line.
  • any remaining glass can be left in its passage sack cavity or the like with the simplest means, e.g. B. are known for removing sand cores, in particular by simple drilling, by vibration, blasting media or high pressure water.
  • the mold core itself can be designed as a hollow body or solid. Hollow mold cores are preferred, particularly with regard to mechanical or thermal stability.
  • the mandrel can be longer than the shaft and therefore be supported at least on one of its longitudinal ends outside the outer contour of the camshaft. If the mandrel is only supported at one longitudinal end outside the outer contour of a camshaft, it is within the mold with the help of a core support. e.g. B. position as usual with the help of steel pieces, especially to rule out floating in the initially liquid iron.
  • the mandrel completely protrudes from the mold with its two longitudinal ends, it usually requires no supports up to a diameter / length ratio of only about 1: 100, so that there is a rod-like or rod-like elongated mandrel, with the help of which an appropriately elongated core is provided To produce a continuous hollow cast iron body. Cores that are relatively long are appropriately supported against floating in the middle at the top.
  • the method according to the invention preferably also relates to producing a cast iron body which has a defined cavity without any access to the outside due to the casting.
  • a cavity can also be elongated in a rod-like manner and take into account any value of stability, weight or the like of the workpiece to be produced be specified by its contour.
  • a mandrel for casting a cast iron body having a defined cavity consists of melting a glass tube at both longitudinal ends and using core supports at the longitudinal ends inside the mold in a manner which is sufficiently stable for the casting is positioned.
  • the core supports can preferably consist of an iron ring to be pushed over the mold core, on which support legs are attached, for example at a mutual distance of 120 °.
  • the closed mold core which remains completely within the mold during casting, can have any configuration as a closed glass bulb, but also as a solid glass body.
  • the term “cavity” of the cast iron body is understood according to the invention to mean a through opening with two — possibly axial — entrances, a blind hole or a space that is completely enclosed by the cast iron during casting. While in the presence of an opening leading to the outside due to the casting, the glass remaining inside the cavity or on the walls thereof can be removed after the casting, such a post-treatment is not always necessary or desirable in the cavity enclosed on all sides.
  • a cavity enclosed on all sides is particularly advantageous if only a reduction in weight is desired and / or if the cavity is fully defined should not have blind holes to be produced by casting with sufficient accuracy or should have openings that penetrate into the interior, which can be subsequently created with the aid of a drill, which is not disturbed by any casting hole.
  • blind holes in general - usually already during the design of the cast body - it must be ensured that the drill does not reach or penetrate the glass core, because otherwise it is usually necessary to dispose of the glass completely.
  • through-holes are to be drilled, the interior of the cavity should generally be treated in the same way as in the case of cavities which are cast on one or more sides.
  • Quartz glass is preferred, and quartz material in particular because of the reduced expenditure. Quartz glass is made from crystalline quartz by complete melting and degassing. In contrast, the quartz material which has proven particularly useful in the context of the present invention can already be produced by partially melting or sintering quartz sand. In practice, glasses that have previously been used to draw samples from a steel or iron melt for analysis by pipette type are also favorable. If contoured cores are required, a mold core according to the invention consisting of glass can be combined with glass parts of larger or smaller diameter or with a conventional mold core made of sand. The contoured cores of the type according to the invention can also run through the shape or end on one side or even all around within the shape.
  • the section through a casting mold according to FIG. 1 shows the lower mold 1, the upper mold 2 and a glass tube 3 serving as the mold core.
  • the hatched cavity between the lower mold 1 and the upper mold 2 is filled with the cast iron which later forms the cast iron body 4.
  • the softening point of the glass 3 used to manufacture the glass tube is far below the temperature of the liquid iron, the casting and subsequent cooling of the cast iron body 4 result in a smooth inner surface 5 of the casting 4 corresponding to the surface quality of the glass tube 3.
  • Fig. 2 shows a perspective view of a lower mold 6 and a mandrel 7, by means of which a camshaft can be produced.
  • the lower mold 6 has the recesses 8 corresponding to the outer shape of the cast iron body 4 to be produced.
  • raised zones 9 are provided on the surface of the molded core 7 formed as a glass tube. The material distribution or removal is preferably made such that the cast iron body 4 to be produced has largely the same wall thickness everywhere.
  • Fig. 3 shows a shape in section with the mold core 7 enclosed on all sides between the lower mold 1 and the upper mold 2. This is positioned in the cavity remaining between the lower mold 1 and the upper mold 2 with the aid of three core supports 10 each such that the cast iron piece 4 to be produced has the desired inner contour receives.
  • the core supports 10 are to be dimensioned such that they not only support the mandrel 7 but can also resist its buoyancy in the liquid iron.
  • depressions 8 and raised zones 9 on the lower and upper molds 1, 2 and on the mold core itself can also be provided with an enclosed mold core 7, which correspond to a cam of the cast iron piece 4 to be produced.
  • the mold core 7 to be used in a casting mold according to FIG. 3 can be designed both as a hollow body and as a solid body made of glass, preferably quartz. Since the core is to be built into the cast iron body essentially for the purpose of saving weight, it is of course particularly expedient to use a hollow body made of glass as the mold core. Because of the relatively low specific weight of glass (compared to iron), there is a considerable reduction in the weight of the cast iron body produced, even when using a solid glass body.
  • the mandrel in addition to being a tube that is open on one or both sides, is also — and preferably — designed as a hollow body made of glass.
  • a glass bulb was melted under normal pressure, so there was normal air pressure in the bulb.
  • Such a piston was positioned with the help of core supports between the upper and lower mold so that it had the desired distance from the outer mold everywhere. After casting and cooling the cast iron body, it could be determined by ultrasound that the hollow piston had not changed its position during casting. The further check by sawing the cast body also showed a perfect design and exact position of the cavity enclosed on all sides in the workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

Ein Gußeisenkörper, insbesondere Nockenwelle (4), mit eingegossenem Hohlraum läßt sich mit Hilfe eines Formkerns (3) aus Glas herstellen. Der Formkern kann als langgestrecktes Glasrohr beidseitig offen ganz durch die Form hindurchgehen, einseitig geschlossen in ihr enden oder als geschlossener Glaskolben ganz von der Außenform umschlossen werden.A cast iron body, in particular a camshaft (4), with a cast-in cavity can be made of glass with the aid of a mandrel (3). The mandrel can extend completely through the mold as an elongated glass tube on both sides, end in it closed on one side, or be completely enclosed by the outer shape as a closed glass bulb.

Description

Die Erfindung betrifft ein Verfahren zum Gießen eines Gußeisenkörpers mit einem mit Hilfe eines Formkerns ge­bildeten Hohlraum. Sie betrifft ferner ein Verfahren zum Gießen einer einen langgestreckten Hohlraum aufweisen­den, zur Anwendung in einem Verbrennungsmotor vorgesehe­ner Nockenwelle aus Gußeisen. Die Erfindung betrifft außerdem eine Gießform mit einem Formkern in der Eisen­gießerei und einen Gußeisenkörper.The invention relates to a method for casting a cast iron body with a cavity formed with the aid of a mandrel. It also relates to a method of casting a cast iron camshaft having an elongated cavity for use in an internal combustion engine. The invention also relates to a casting mold with a mold core in the iron foundry and a cast iron body.

Wenn ein langgestreckten Gußeisenteil als Hohlkörper mit entsprechend langgestrecktem Durchgang gegossen werden soll, muß ein Kern angefertigt und in die Form einge­bracht werden, in die die Eisenschmelze zu gießen ist. In der GB-PS 11 91 202 wird vorgeschlagen, als Formkern ein Stahlrohr mit darin eingesetztem, mit Isolierstoff beschichtetem Stahlstab zu verwenden. Bei diesem Verfah­ren wird flüssiges Eisen in die Form gegossen und an­schließend der Stahlstab aus dem Stahlrohr, das Bestand­teil des Gußkörpers wird, herausgezogen. Ein wesent­licher Nachteil dieser Verfahrensweise besteht darin, daß an der Grenze zwischen dem Stahl und dem Gußeisen eine sehr harte, schwer zu bohrende Abschreckschicht entsteht. Der Aufwand für das Stahlrohr ist erheblich.If an elongated cast iron part is to be cast as a hollow body with a correspondingly elongated passage, a core must be made and inserted into the mold into which the molten iron is to be poured. In GB-PS 11 91 202 it is proposed to use a steel tube with a steel rod inserted therein and coated with insulating material as the mold core. In this process, liquid iron is poured into the mold and then the steel rod is pulled out of the steel tube that becomes part of the cast body. A major disadvantage of this procedure is that a very hard, difficult-to-drill quench layer is formed at the boundary between the steel and the cast iron. The effort for the steel pipe is considerable.

In einem weiteren aus der britischen Patentanmeldung 84 03 355 vom 02. Februar 1984 bekannten Verfahren besteht der Formkern aus einem mit Keramikpapier oder der­gleichen Isolierstoff bewickelten Stahlrohrkern. Das Keramikpapier bildet bei diesem Verfahren eine Isolierschicht zwischen der in die Form gegossenen Schmelze und dem weit kühleren Stahlrohr. Die Isolierschicht wird durch die beim Gießen einfließende Eisenschmelze aufgebraucht, z. B. verbrannt, so daß sich das innen liegende Metallrohr nach dem Erstarren des hergestellten Gußkörpers aus diesem herausziehen läßt. Es ist sehr mühsam, jeden Formkern vor dem Einbringen in die Form mit dem vorgesehenen Isoliermaterial zu um­wickeln außerdem wird die Oberfläche der Wicklung nicht vollständig eben, so daß die Innenfläche der Durchgangs­öffnung des herzustellenden Gußeisenstücks nachzubear­beiten ist.In a further method known from British patent application 84 03 355 from February 02, 1984, the mandrel consists of a tubular steel core wound with ceramic paper or similar insulating material. In this process, the ceramic paper forms an insulating layer between the melt poured into the mold and the much cooler steel tube. The insulating layer is the one that flows in during casting Iron melt used up, e.g. B. burned, so that the inner metal tube can be pulled out of the cast body after it solidifies. It is very troublesome to wrap each mold core with the intended insulating material before it is introduced into the mold, moreover the surface of the winding does not become completely flat, so that the inner surface of the through opening of the cast iron piece to be manufactured has to be reworked.

Relativ ebene Innenflächen von Durchgangsöffnungen lang­gestreckter Gußeisenteile werden erhalten, wenn nach der GB-PS 15 96 442 ein Graphitstab als Formkern verwendet wird. Bei dieser Verfahrensweise ist das Handling außer­ordentlich schwierig und in der Praxis kaum durchführ­bar, da Graphitstäbe sehr bruchempfindlich sind und eine sehr poröse Oberfläche besitzen, so daß beispielsweise durch Hautkontakt aufgebrachte Feuchtigkeit und Fett­reste zu Gießfehlern, wie Blasen, führen können. Außer­dem werden bei einem Graphitkern ähnlich wie bei einem Sandkern Abstützungen auch im mittleren Bereich der Stablänge gebraucht, wenn das Längen/Durchmesser-Ver­hältnis des Kerns einen bestimmten Wert übersteigt.Relatively flat inner surfaces of through openings of elongated cast iron parts are obtained if, according to GB-PS 15 96 442, a graphite rod is used as the mandrel. With this procedure, the handling is extremely difficult and can hardly be carried out in practice, since graphite rods are very sensitive to breakage and have a very porous surface, so that, for example, moisture and fat residues caused by skin contact can lead to casting defects, such as bubbles. In addition, in the case of a graphite core, similar to a sand core, supports are also used in the central region of the rod length if the length / diameter ratio of the core exceeds a certain value.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Herstellen eines hohlgegossenen Gußeisenkörpers, insbesondere einer hohlgegossenen Nockenwelle, also eines relativ zur Länge dünnen Gußeisenkörpers, zu schaffen, das es erlaubt sowohl Hohlkörper ohne Gußöffnung oder Hohlkörper mit sehr dünnen, beispiels­weise lediglich zur Ölversorgung von Lagern geeigneten, Durchgangsöffnungen oder Sacklöchern als auch Hohlkörper mit, beispielsweise gewichtsmindernd, relativ zum Werk­stückaußendurchmesser dickem zylindrischem und/oder der Außenkontur des Werkstücks angepaßtem Hohlraum zu gie­ßen. Die Innenfläche des Gußteils soll, wenn und inso­weit sie überhaupt erreichbar bzw. von Bedeutung ist, ohne wesentliche Nachbearbeitung etwa der Oberflächen­güte einer mechanischen Bohrung entsprechen, schließlich soll ein auch in der Praxis eines Gießereibetriebs pro­blemloses Handling möglich sein. Weiterhin besteht die der Erfindung zugrunde liegende Aufgabe darin, für die Eisengießerei eine Gießform mit einem Formkern zu schaf­fen, der ohne Abstützung von dem mittleren Bereich sei­ner Länge auch bei Längen/Durchmesser-Verhältnissen des Kern von bis zu 500 mm/5 mm einsetzbar sein soll. Schließlich soll durch die Erfindung ein hohlgegossenes Werkstück aus Gußeisen geschaffen werden.The invention has for its object to provide a method for producing a hollow cast iron body, in particular a hollow cast camshaft, i.e. a cast iron body thin relative to the length, which allows hollow bodies without a casting opening or hollow bodies with very thin, for example, only for oil supply to bearings suitable through openings or blind holes as well as hollow bodies to cast with, for example weight-reducing, relatively thick cylindrical and / or adapted to the outer contour of the workpiece cavity relative to the workpiece outer diameter. The inner surface of the cast part, if and insofar as it is attainable or of importance, should correspond to the surface quality of a mechanical bore without substantial reworking, after all a problem-free handling should also be possible in the practice of a foundry. Furthermore, the object underlying the invention is to create a casting mold for the iron foundry with a mold core which, without support from the central region of its length, can also be used with length / diameter ratios of the core of up to 500 mm / 5 mm . Finally, a hollow cast workpiece made of cast iron is to be created by the invention.

Die erfindungsgemäße Lösung besteht für das Verfahren zum Gießen eines Gußeisenkörpers mit einem mit Hilfe eines Formkerns gebildeten Hohlraum darin, daß ein aus Glas bestehender Formkern ganz in den Gußeisenkörper eingeschlossen wird. Entsprechend ist eine Gießform mit Formkern in der Eisengießerei, dadurch gekennzeichnet, daß ein aus Glas bestehender Formkern ganz vom herzu­stellenden Gußeisenkörper umschlossen ist. Der Gußeisen­körper selbst ist gekennzeichnet durch einen beim Gießen allseitig umschlossenen Hohlraum, an dessen Innenkontor Glas, insbesondere Quarzgut, anliegt. Für das Verfahren zum Herstellen einer Nockenwelle besteht die erfindungs­gemäße Lösung darin, daß beim Gießen ein Formkern aus Glas verwendet wird. Der erfindungsgemäß vorgesehene Formkern kann eine glatte zylindrische oder auch eine den Erfordernissen nach Stabilität, Gewicht oder der­gleichen konturierte Oberfläche besitzen. Verbesserungen und weitere Ausgestaltungen der Erfindung werden in den Unteransprüchen angegeben.The solution according to the invention for the method for casting a cast iron body with a cavity formed with the aid of a mold core is that a mold core made of glass is completely enclosed in the cast iron body. Correspondingly, a casting mold with a mold core in the iron foundry is characterized in that a mold core made of glass is completely enclosed by the cast iron body to be produced. The cast iron body itself is characterized by a cavity which is enclosed on all sides during casting and on the inner contour of which glass, in particular quartz material, bears. For the method for producing a camshaft, the solution according to the invention consists in that a mold core made of glass is used during casting. The mold core provided according to the invention can be a smooth cylindrical or also a have a contoured surface for stability, weight or the like. Improvements and further refinements of the invention are specified in the subclaims.

Durch die Erfindung werden ein Gießverfahren und eine Gießform mit stabartig langgestrecktem Formkern geschaf­fen, die es in der Eisengießerei erlauben, ein langge­strecktes Werkstück als Hohlkörper zu gießen, ohne daß ein wesentliches Nachbearbeiten der Innenkontur erfor­derlich wäre und ohne daß im Werkstück schwer zu durch­bohrende Abschreckschichten oder dergleichen entständen. Das Verfahren und die Form mit einem Glasrohr als Form­kern sind besonders gut geeignet zum Herstellen einer Nockenwelle, die bekanntlich für ihre Länge relativ dünn ist, aber aus Gründen der Gewichtserspranis oder als Öl­zuführleitung eine teilweise oder ganz durchgehende Längshöhlung haben soll.The invention provides a casting method and a casting mold with a rod-like elongated mold core, which allow an elongated workpiece to be cast as a hollow body in the iron foundry, without substantial reworking of the inner contour being necessary and without quenching layers or the like which are difficult to pierce in the workpiece arise. The method and the shape with a glass tube as the mold core are particularly well suited for producing a camshaft, which is known to be relatively thin for its length, but is said to have a partially or completely continuous longitudinal cavity for reasons of weight savings or as an oil supply line.

Nach dem Gießen und Abkühlen einer erfindungsgemäß wenigstens einseitig offen hergestellten Nockenwelle kann in deren Durchgangssackhöhlung oder dergleichen etwa noch verbliebenes Glas mit einfachsten Mitteln, die z. B. zum Entfernen von Sandkernen bekannt sind, insbesondere durch einfaches Bohren, durch Vibration, Strahlmittel oder Wasserhochdruck, ausgelöst werden.After the casting and cooling of a camshaft according to the invention which is at least open on one side, any remaining glass can be left in its passage sack cavity or the like with the simplest means, e.g. B. are known for removing sand cores, in particular by simple drilling, by vibration, blasting media or high pressure water.

Der erfindungsgemäße Formkern selbst kann als Hohlkörper oder massiv ausgebildet werden. Vor allem im Hinblick auf die mechanische oder thermische Stabilität werden hohle Formkerne bevorzugt. Beim Gießen einer Nockenwelle kann der Formkern länger als die Welle sein und daher wenigstens an einem seiner Längsenden außerhalb der Au­ßenkontur der Nockenwelle abgestützt werden. Wenn der Formkern nur an einem Längsende außerhalb der Außenkon­tur einer Nockenwelle abgestützt wird, ist er innerhalb der Form mit Hilfe einer Kernstütze. z. B. wie üblich mit Hilfe von Stahlstückchen, zu positionieren, insbesondere um ein Aufschwimmen im zunächst flüssigen Eisen auszuschließen. Wenn der Formkern mit seinen bei­den Längsenden ganz aus der Form herausragt, benötigt er in der Regel bis zu einem Durchmesser/Längenverhältnis nur etwa 1:100 keine Abstützungen, so daß ein stangen­artig bzw. stabartig langgestreckter Formkern vorliegt, mit dessen Hilfe ein einen entsprechend langgestreckten, durchgehenden Hohlraum aufweisender Gußeisenkörper her­zustellen ist. Im Verhältnis längere Kerne werden zweck­mäßig etwa in der Mitte oben gegen ein Aufschwimmen ab­gestützt.The mold core itself can be designed as a hollow body or solid. Hollow mold cores are preferred, particularly with regard to mechanical or thermal stability. When casting a camshaft, the mandrel can be longer than the shaft and therefore be supported at least on one of its longitudinal ends outside the outer contour of the camshaft. If the mandrel is only supported at one longitudinal end outside the outer contour of a camshaft, it is within the mold with the help of a core support. e.g. B. position as usual with the help of steel pieces, especially to rule out floating in the initially liquid iron. If the mandrel completely protrudes from the mold with its two longitudinal ends, it usually requires no supports up to a diameter / length ratio of only about 1: 100, so that there is a rod-like or rod-like elongated mandrel, with the help of which an appropriately elongated core is provided To produce a continuous hollow cast iron body. Cores that are relatively long are appropriately supported against floating in the middle at the top.

Wenn der Formkern einseitig innerhalb der Form endet, und - wie gesagt - an diesem Ende mit einer Kernstütze positioniert wird, entsteht bei entsprechend langge­strecktem stabartig dünnem Formkern ein ebenso langge­strecktes dünnes Sackloch in dem fertig gegossenen Werk­stück.If the mandrel ends on one side within the mold and - as I said - is positioned at this end with a core support, a correspondingly elongated thin blind hole is formed in the finished cast workpiece with a correspondingly elongated rod-like thin mandrel.

Das erfindungsgemäße Verfahren bezieht sich bevorzugt auch darauf, einen Gußeisenkörper herzustellen, der ei­nen definierten Hohlraum ohne jeden durch das Gießen be­dingten Zugang nach außen besitzt. Auch ein solcher Hohlraum kann stabartig langgestreckt sein und jeden beliebigen Wert von Stabilität, Gewicht oder dergleichen des herzustellenden Werkstücks unter Berücksichtigung von dessen Kontur vorgegeben werden. Im einfachsten Fall besteht ein Formkern zum Gießen eines einen definierten Hohlraum (ohne einen durch das Gießen bedingten Zugang) aufweisenden Gußeisenkörpers darin, daß ein Glasrohr an beiden Längsenden zugeschmolzen und mit Hilfe von Kern­stützen an den Längsenden innerhalb der Form in für das Gießen ausreichend stabiler Weise positioniert wird. Vorzugsweise können die Kernstützen aus einem über den Formkern zu schiebenden Eisenring bestehen, an dem bei­spielsweise mit 120° gegenseitigem Abstand, Stützbeine angesetzt werden. Im allgemeinen werden jedoch, z. B. drei oder vier, getrennte Stützen verwendet. Grundsätz­lich kann der geschlossene, beim Gießen ganz innerhalb der Form verbleibende Formkern jede beliebige Konfigura­tion als geschlossener Glaskolben aber auch als massiver Glaskörper besitzen.The method according to the invention preferably also relates to producing a cast iron body which has a defined cavity without any access to the outside due to the casting. Such a cavity can also be elongated in a rod-like manner and take into account any value of stability, weight or the like of the workpiece to be produced be specified by its contour. In the simplest case, a mandrel for casting a cast iron body having a defined cavity (without an access due to the casting) consists of melting a glass tube at both longitudinal ends and using core supports at the longitudinal ends inside the mold in a manner which is sufficiently stable for the casting is positioned. The core supports can preferably consist of an iron ring to be pushed over the mold core, on which support legs are attached, for example at a mutual distance of 120 °. In general, however, e.g. B. three or four, separate supports used. In principle, the closed mold core, which remains completely within the mold during casting, can have any configuration as a closed glass bulb, but also as a solid glass body.

Nach dem Vorangehenden wird erfindungsgemäß unter dem Begriff "Hohlraum" des Gußeisenkörpers eine Durchgangs­öffnung mit zwei -gegebenenfalls axialen - Eingängen, ein Sackloch oder ein beim Gießen erzeugter ganz von dem Gußeisen umschlossener Raum verstanden. Während bei Vor­handensein einer durch das Gießen bedingten nach außen führenden Öffnung das innerhalb des Hohlraums bzw. an dessen Wänden verbliebene Glas nach dem Gießen entfernt werden kann, ist eine solche Nachbehandlung bei dem all­seits umschlossenen Hohlraum nicht immer erforderlich oder erwünscht.According to the foregoing, the term “cavity” of the cast iron body is understood according to the invention to mean a through opening with two — possibly axial — entrances, a blind hole or a space that is completely enclosed by the cast iron during casting. While in the presence of an opening leading to the outside due to the casting, the glass remaining inside the cavity or on the walls thereof can be removed after the casting, such a post-treatment is not always necessary or desirable in the cavity enclosed on all sides.

Ein allseitig umschlossener Hohlraum ist dann von beson­derem Vorteil, wenn lediglich eine Gewichtsminderung er­wünscht wird und/oder wenn der Hohlraum ganz definierte durch das Gießen nicht mit ausreichender Genauigkeit herzustellende Sacklöcher oder bis in das Innere durchgehende Öffnungen besitzen soll, die nachträglich mit Hilfe eines - durch kein Gußloch gestörten - Boh­rers zu erzeugen sind. Beim Bohren von Sacklöchern wird im allgemeinen - meist schon bei der Konzeption des Guß­körpers - darauf zu achten sein, daß der Bohrer nicht bis an den Glaskern herankommt oder diesen durchstößt, weil es sonst in der Regel erforderlich wird, das Glas vollständig zu entsorgen. Wenn dagegen durchgehende Boh­rungen hergestellt werden sollen, ist das Innere des Hohlraums im Prinzip meist ebenso zu behandeln, wie im Fall von ein- oder mehrseitig offen gegossenen Hohlräu­men.A cavity enclosed on all sides is particularly advantageous if only a reduction in weight is desired and / or if the cavity is fully defined should not have blind holes to be produced by casting with sufficient accuracy or should have openings that penetrate into the interior, which can be subsequently created with the aid of a drill, which is not disturbed by any casting hole. When drilling blind holes in general - usually already during the design of the cast body - it must be ensured that the drill does not reach or penetrate the glass core, because otherwise it is usually necessary to dispose of the glass completely. If, on the other hand, through-holes are to be drilled, the interior of the cavity should generally be treated in the same way as in the case of cavities which are cast on one or more sides.

Zum Herstellen des erfindungsgemäßen Formkerns kommen verschiedene Gläser infrage. Bevorzugt werden Quarzglas und wegen des verminderten Aufwands vor allem Quarzgut. Quarzglas wird aus kristallinem Quarz durch vollständi­ges Schmelzen und Entgasen hergestellt. Demgegenüber kann das im Zusammenhang und der vorliegenden Erfindung ganz besonders bewährte Quarzgut bereits durch teilwei­ses Schmelzen bzw. Sintern von Quarzsand erzeugt werden. In der Praxis günstig sind auch Gläser, die schon bisher dazu verwendet wurden, aus einer Stahl- oder Eisen­schmelze Proben für Analysen nach Pipettenart zu ziehen. Wenn konturierte Kerne benötigt werden, kann ein erfin­dungsgemäßer, aus Glas bestehender Formkern mit Glastei­len größeren oder kleineren Durchmessers oder mit einem üblichen Formkern aus Sand kombiniert werden. Auch die konturierten Kerne des erfindungsgemäßen Typs können durch die Form durchgehen oder einseitig bzw. sogar rundum innerhalb der Form enden.Various glasses can be used to produce the mold core according to the invention. Quartz glass is preferred, and quartz material in particular because of the reduced expenditure. Quartz glass is made from crystalline quartz by complete melting and degassing. In contrast, the quartz material which has proven particularly useful in the context of the present invention can already be produced by partially melting or sintering quartz sand. In practice, glasses that have previously been used to draw samples from a steel or iron melt for analysis by pipette type are also favorable. If contoured cores are required, a mold core according to the invention consisting of glass can be combined with glass parts of larger or smaller diameter or with a conventional mold core made of sand. The contoured cores of the type according to the invention can also run through the shape or end on one side or even all around within the shape.

Anhand der schematischen Darstellung von Ausführungsbei­spielen werden Einzelheiten der Erfindung erläutert. Es zeigen:

  • Fig. 1 eine Gießform im Schnitt quer zur Längsrichtung eines langgestreckten Form­kerns;
  • Fig. 2 eine untere Halbschale einer Gießform und einen als Glasrohr ausgebildeten Formkern; und
  • Fig. 4 eine Form im Schnitt mit einem allseitig eingeschlossenen Formkern.
Details of the invention are explained on the basis of the schematic representation of exemplary embodiments. Show it:
  • 1 shows a casting mold in section transverse to the longitudinal direction of an elongated mold core.
  • 2 shows a lower half-shell of a casting mold and a mold core designed as a glass tube; and
  • Fig. 4 shows a shape in section with a mold core enclosed on all sides.

Der Schnitt durch eine Gießform nach Fig. 1 zeigt die Unterform 1, die Oberform 2 und ein als Formkern dienen­des Glasrohr 3. Beim Gießen wird der schraffierte Hohl­raum zwischen Unterform 1 und Oberform 2 mit dem den späteren Gußeisenkörper 4 bildenden Eisenguß ausgefüllt. Obwohl der Erweichungspunkt des zum Herstellen des Glas­rohrs verwendeten Glases 3 weit unterhalb der Temperatur des flüssigen Eisens liegt, entsteht beim Gießen und an­schließenden Abkühlen des Gußeisenkörpers 4 eine der Oberflächenqualität des Glasrohrs 3 entsprechend glatte Innenfläche 5 des Gußkörpers 4.The section through a casting mold according to FIG. 1 shows the lower mold 1, the upper mold 2 and a glass tube 3 serving as the mold core. During the casting, the hatched cavity between the lower mold 1 and the upper mold 2 is filled with the cast iron which later forms the cast iron body 4. Although the softening point of the glass 3 used to manufacture the glass tube is far below the temperature of the liquid iron, the casting and subsequent cooling of the cast iron body 4 result in a smooth inner surface 5 of the casting 4 corresponding to the surface quality of the glass tube 3.

Fig. 2 zeigt eine perspektivische Darstellung einer Un­terform 6 und eines Formkerns 7, mit deren Hilfe eine Nockenwelle herzustellen ist. Die Unterform 6 weist der Außenform des herzustellenden Gußeisenkörpers 4 ent­sprechende Vertiefungen 8 auf. Diesen Vertiefungen 8 entsprechend werden auf der Oberfläche des als Glasrohr ausgebildeten Formkerns 7 erhabene Zonen 9 vorgesehen. Die Materialverteilung bzw. Wegnahme wird vorzugsweise so getroffen, daß der herzustellende Gußeisenkörper 4 überall weitgehend gleiche Wandstärke erhält.Fig. 2 shows a perspective view of a lower mold 6 and a mandrel 7, by means of which a camshaft can be produced. The lower mold 6 has the recesses 8 corresponding to the outer shape of the cast iron body 4 to be produced. Corresponding to these depressions 8, raised zones 9 are provided on the surface of the molded core 7 formed as a glass tube. The material distribution or removal is preferably made such that the cast iron body 4 to be produced has largely the same wall thickness everywhere.

Fig. 3 zeigt eine Form im Schnitt mit allseitig zwischen Unterform 1 und Oberform 2 eingeschlossenem Formkern 7. Dieser wird in dem zwischen Unterform 1 und Oberform 2 verbleibenden Hohlraum mit Hilfe von je drei Kernstützen 10 so positioniert, daß das herzustellende Gußeisenstück 4 die gewünschte Innenkontur erhält. die Kernstützen 10 sollen so dimensioniert werden, daß sie den Formkern 7 nicht nur tragen sondern auch seinem Auftrieb im flüssi­gen Eisen widerstehen können.Fig. 3 shows a shape in section with the mold core 7 enclosed on all sides between the lower mold 1 and the upper mold 2. This is positioned in the cavity remaining between the lower mold 1 and the upper mold 2 with the aid of three core supports 10 each such that the cast iron piece 4 to be produced has the desired inner contour receives. the core supports 10 are to be dimensioned such that they not only support the mandrel 7 but can also resist its buoyancy in the liquid iron.

Gemäß Fig. 3 können auch bei einem eingeschlossenen Formkern 7 Vertiefungen 8 und erhabene Zonen 9 an Unter- ­und Oberform 1, 2 bzw. am Formkern selbst vorgesehen werden, die einem Nocken des herzustellenden Gußeisenstücks 4 entsprechen.According to FIG. 3, depressions 8 and raised zones 9 on the lower and upper molds 1, 2 and on the mold core itself can also be provided with an enclosed mold core 7, which correspond to a cam of the cast iron piece 4 to be produced.

Der in einer Gießform entsprechend Fig. 3 zu verwendende Formkern 7 kann sowohl als Hohlkörper als auch als Mas­sivkörper aus Glas, vorzugsweise Quarzgut, ausgebildet werden. Da der Kern im wesentlichen aus Gründen der Ge­wichtsersparnis in den Gußeisenkörper eingebautwerden soll, ist es natürlich besonders günstig, als Formkern einen Hohlkörper aus Glas zu verwenden. Wegen des rela­tiv (gegenüber Eisen) geringen spezifischen Gewichts von Glas ergibt sich aber auch bei Einsatz eines massiven Glaskörpers eine erhebliche Gewichtsverminderung des hergestellten Gußeisenkörpers.The mold core 7 to be used in a casting mold according to FIG. 3 can be designed both as a hollow body and as a solid body made of glass, preferably quartz. Since the core is to be built into the cast iron body essentially for the purpose of saving weight, it is of course particularly expedient to use a hollow body made of glass as the mold core. Because of the relatively low specific weight of glass (compared to iron), there is a considerable reduction in the weight of the cast iron body produced, even when using a solid glass body.

Ohne Verletzung des fertigen Gußeisenkörpers kann man nicht ohne weiteres feststellen, ob der eingegossene Hohlraum die vorgesehene Position hat, ob also die Dicke der Wand um den Hohlraum herum, überall die gleiche ge­wünschte Stärke besitzt. Die entsprechende Qualitätsprü­fung kann jedoch beispielsweise mit Hilfe von Ultra­schall-Meßverfahren vorgenommen werden. Die Gießerei ist daher in der Lage, dem Abnehmer eine gleichbleibende Qualität zu garantieren.Without damaging the finished cast iron body, it cannot be readily determined whether the cast cavity has the intended position, that is, whether the thickness of the wall around the cavity has the same desired thickness everywhere. The corresponding quality check can, however, be carried out, for example, with the aid of ultrasound measuring methods. The foundry is therefore able to guarantee the customer a constant quality.

Versuche haben ergeben, daß der Formkern außer als ein- ­oder beiseitig offenes Rohr auch - und bevorzugt - als Hohlkörper aus Glas auszubilden ist. Bei Versuchen wurde ein Glaskolben unter Normaldruck zugeschmolzen, in dem Kolben herrschte also normaler Luftdruck. ein solcher kolben wurde mit Hilfe von Kernstützen zwischen Ober- ­und Unterform so positioniert, daß er überall den gewünschten Abstand von der Außenform besaß. Nach dem Gießen und Abkühlen des Gußeisenkörpers konnte durch Ul­traschall festgestellt werden, daß der Hohlkolben seine Position beim Gießen nicht verändert hat. Die weitere Überprüfung durch Aufsägen des Gußkörpers ergab eben­falls eine einwandfreie Ausbildung und exakte Position des in dem Werkstück herzustellenden allseits einge­schlossenen Hohlraums.Tests have shown that the mandrel, in addition to being a tube that is open on one or both sides, is also — and preferably — designed as a hollow body made of glass. In experiments, a glass bulb was melted under normal pressure, so there was normal air pressure in the bulb. Such a piston was positioned with the help of core supports between the upper and lower mold so that it had the desired distance from the outer mold everywhere. After casting and cooling the cast iron body, it could be determined by ultrasound that the hollow piston had not changed its position during casting. The further check by sawing the cast body also showed a perfect design and exact position of the cavity enclosed on all sides in the workpiece.

Claims (10)

1. Verfahren zum Gießen eines Gußeisenkörpers mit einem mit Hilfe eines Formkerns gebildeten Hohlraum,
dadurch gekennzeichnet,
daß ein aus Glas bestehender Formkern (7) ganz in den Gußeisenkörper (4) eingeschlossen wird.1. Method for casting a cast iron body with a cavity formed with the help of a mold core,
characterized,
that a glass core (7) is completely enclosed in the cast iron body (4). 2. Verfahren zum Gießen einer einen langgestreckten Hohlraum aufweisenden, zur Anwendung in einem Verbrennungsmotor vorgesehenen Nockenwelle aus Gußeisen,
dadurch gekennzeichnet,
daß beim Gießen ein Formkern (7) aus Glas verwendet wird.2. A method of casting a cast iron camshaft having an elongated cavity for use in an internal combustion engine.
characterized,
that a mold core (7) made of glass is used during casting. 3. Verfahren nach Anspruch 2,
dadurch gekennzeichnet,
daß ein der Länge nach durch die Nockenwelle hindurch­reichendes Glasrohr als Formkern (7) eingesetzt wird.3. The method according to claim 2,
characterized,
that a glass tube extending lengthways through the camshaft is used as the mandrel (7). 4. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß ein allseits vom Gußeisen zu umschließender, hohler Glaskörper, insbesondere ein geschlossener Glaskolben, als Formkern (7) eingesetzt wird.4. The method according to claim 1 or 2,
characterized,
that a hollow glass body to be enclosed on all sides by the cast iron, in particular a closed glass bulb, is used as the mold core (7). 5. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß ein massiver, vorzugsweise innerhalb des Gußeisens verbleibender, Glaskörper als Formkern (7) eingesetzt wird.5. The method according to claim 1 or 2,
characterized,
that a solid glass body, preferably remaining inside the cast iron, is used as the mold core (7). 6. Verfahren nach einem oder mehreren der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß der Formkern (7) mit Hilfe von, insbesondere aus einem über den Formkern (7) zu schiebenden Ring mit dar­an angesetzten Stützbeinen bestehenden, Kernstützen (10) positioniert wird.6. The method according to one or more of claims 1 to 5,
characterized,
that the mold core (7) is positioned with the aid of core supports (10), in particular consisting of a ring to be pushed over the mold core (7) with supporting legs attached to it. 7. Verfahren nach einem oder mehreren der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß der Formkern (7) aus einem Werkstoff nach Art des Materials eines zum Ziehen von Proben aus einer Stahl- ­oder Eisenschmelze geeigneten Glasrohrs, insbesondere aus Quarzglas hergestellt wird.7. The method according to one or more of claims 1 to 6,
characterized,
that the mandrel (7) is made of a material according to the type of material of a glass tube suitable for taking samples from a steel or iron melt, in particular quartz glass. 8. Verfahren nach einem oder mehreren der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß der Formkern (7) aus Quarzgut hergestellt wird.8. The method according to one or more of claims 1 to 6,
characterized,
that the mandrel (7) is made of quartz. 9. Gießform mit, insbesondere stabartig langgestrecktem, Formkern in der Eisengießerei,
dadurch gekennzeichnet,
daß ein aus Glas bestehender Formkern (7) ganz vom her­zustellenden Gußeisenkörper (4) umschlossen ist.9. casting mold with, in particular rod-like elongated, mold core in the iron foundry,
characterized,
that a glass mold core (7) is completely enclosed by the cast iron body (4) to be produced. 10. Gußeisenkörper (4)
gekennzeichnet durch
einen beim Gießen allseitig umschlossenen Hohlraum, an dessen Innenkontur Glas, insbesondere Quarzgut, anliegt.10. Cast iron body (4)
marked by
a cavity enclosed on all sides during casting, on the inner contour of which glass, in particular quartz material, bears.
EP87117268A 1986-12-15 1987-11-24 Process and mould for manufacturing a cast iron object, and object thus produced Expired - Lifetime EP0272471B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87117268T ATE79064T1 (en) 1986-12-15 1987-11-24 METHOD AND MOLD FOR MAKING A CAST IRON BODY AND CAST IRON BODY MANUFACTURED THEREFORE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3642750 1986-12-15
DE3642750 1986-12-15
DE19873712609 DE3712609A1 (en) 1986-12-15 1987-04-14 METHOD AND CAST FORM FOR PRODUCING A CAST IRON BODY AND THAN MANUFACTURED CAST IRON BODY
DE3712609 1987-04-14

Publications (3)

Publication Number Publication Date
EP0272471A2 true EP0272471A2 (en) 1988-06-29
EP0272471A3 EP0272471A3 (en) 1990-01-17
EP0272471B1 EP0272471B1 (en) 1992-08-05

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EP87117268A Expired - Lifetime EP0272471B1 (en) 1986-12-15 1987-11-24 Process and mould for manufacturing a cast iron object, and object thus produced

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US (2) US4832107A (en)
EP (1) EP0272471B1 (en)
KR (1) KR960003708B1 (en)
BR (1) BR8706792A (en)
CA (1) CA1285741C (en)
DE (2) DE3712609A1 (en)
ES (1) ES2033776T3 (en)

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WO1995027579A1 (en) * 1994-04-06 1995-10-19 Georg Fischer Ag Method of producing a casting having an elongate cavity, in particular a camshaft

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JP3008759B2 (en) * 1992-12-18 2000-02-14 株式会社リケンキャステック Hollow camshaft with oil hole in chill surface and its manufacturing method
US5479981A (en) * 1993-12-29 1996-01-02 Hyundai Motor Company Method for casting a hollow camshaft for internal combustion engine
AT405916B (en) * 1995-02-16 1999-12-27 Miba Sintermetall Ag METHOD FOR PRODUCING A CAM FOR A JOINTED CAMSHAFT
JPH0970644A (en) * 1995-09-05 1997-03-18 Toyota Motor Corp Resin core
US5725586A (en) * 1995-09-29 1998-03-10 Johnson & Johnson Professional, Inc. Hollow bone prosthesis with tailored flexibility
DE19645112A1 (en) 1996-11-01 1998-05-14 Roland Klaar Built camshaft
US5911267A (en) * 1996-11-13 1999-06-15 Georg Fischer Disa, Inc. Cope with bore for gassing cores
US5885427A (en) * 1997-06-12 1999-03-23 Corrpro Companies, Inc. Cast iron anode and method of making
DE19925512B4 (en) * 1999-06-02 2009-02-05 Nemak Dillingen Gmbh mold
US7629292B2 (en) * 2000-10-19 2009-12-08 Battelle Energy Alliance, Llc Composite media for ion processing
DE10061173A1 (en) * 2000-12-07 2002-06-27 Winter Fritz Eisengiesserei Method, device and cast iron alloy for producing a camshaft and camshaft with cast-on cams
KR20030069656A (en) * 2002-02-22 2003-08-27 최창옥 Casting method of a small diameter hollow cast-iron product using quartz glass core
DE10333872B4 (en) * 2003-07-17 2015-01-22 Mahle International Gmbh Use of a soluble glass composition as a casting core
DE102004009488B4 (en) * 2004-02-27 2007-10-11 Mahle Ventiltrieb Gmbh Core support and casting mold with at least one such core support
DE102006030699B4 (en) * 2006-06-30 2014-10-02 Daimler Ag Cast steel piston for internal combustion engines
US8418366B2 (en) * 2007-11-27 2013-04-16 Namiki Seimitsu Houseki Kabushiki Kaisha Internal gear manufacturing method and metallic glass internal gear manufactured thereby
US8533946B2 (en) * 2011-12-14 2013-09-17 GM Global Technology Operations LLC Method of manufacturing a crankshaft
CN104353791B (en) * 2014-11-13 2016-09-21 四川南车共享铸造有限公司 A kind of oil pipe foundry sand cored structure and preparation method thereof, application
CN106238689A (en) * 2016-08-31 2016-12-21 广西玉柴机器股份有限公司 The process of casting engine oil channel elongated hole
CN107442743A (en) * 2017-08-21 2017-12-08 安徽省含山县兴建铸造厂 A kind of Al-alloy products shell moulded casting method

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DE1259511B (en) * 1964-08-12 1968-01-25 Karl Heinz Toennes Use of hollow glass cores
GB1191202A (en) * 1967-04-01 1970-05-13 Nippon Piston Ring Co Ltd Method of Producing Cam Shafts and Cam Shafts Produced by Such Method
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995027579A1 (en) * 1994-04-06 1995-10-19 Georg Fischer Ag Method of producing a casting having an elongate cavity, in particular a camshaft

Also Published As

Publication number Publication date
KR880007151A (en) 1988-08-26
KR960003708B1 (en) 1996-03-21
DE3712609A1 (en) 1988-06-23
CA1285741C (en) 1991-07-09
DE3780926D1 (en) 1992-09-10
EP0272471A3 (en) 1990-01-17
US4927688A (en) 1990-05-22
BR8706792A (en) 1988-07-05
US4832107A (en) 1989-05-23
EP0272471B1 (en) 1992-08-05
ES2033776T3 (en) 1993-04-01

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