EP2313219A1 - Device for carrying cores - Google Patents

Device for carrying cores

Info

Publication number
EP2313219A1
EP2313219A1 EP09780067A EP09780067A EP2313219A1 EP 2313219 A1 EP2313219 A1 EP 2313219A1 EP 09780067 A EP09780067 A EP 09780067A EP 09780067 A EP09780067 A EP 09780067A EP 2313219 A1 EP2313219 A1 EP 2313219A1
Authority
EP
European Patent Office
Prior art keywords
core
holding tube
holding
tube
cores
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
EP09780067A
Other languages
German (de)
French (fr)
Other versions
EP2313219B1 (en
Inventor
Dirk Thiemann
Gudrun Schiller
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.)
Emil Mueller GmbH
Original Assignee
Emil Mueller GmbH
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 Emil Mueller GmbH filed Critical Emil Mueller GmbH
Priority to PL09780067T priority Critical patent/PL2313219T3/en
Publication of EP2313219A1 publication Critical patent/EP2313219A1/en
Application granted granted Critical
Publication of EP2313219B1 publication Critical patent/EP2313219B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B22C21/12—Accessories
    • B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars

Definitions

  • the invention relates to a device for the self-supporting arrangement of a liquid solvent-soluble core in the form of a casting apparatus.
  • the object of the invention is to present a structurally simple mechanical device for the cantilevered arrangement of a liquid solvent-soluble core in the form of a casting device.
  • a device according to the invention for the self-supporting arrangement of a liquid solvent-soluble core in the form of a casting device are specially designed holding tubes.
  • these holding tubes one end is inserted into the core and the other end into the mold wall or into another part of the mold, for example a further core.
  • the core is then held by one or more holding tubes.
  • the holding tube has a smaller cross-section at the end inserted in the core than the end with which it is inserted into other parts of the casting mold.
  • the device in the form of a holding tube has the advantage that it can be used in particular for cores which have a small cross-section.
  • cores are, for example, the annular cores, as they are used for shaping of cooling channels in pistons, in particular in pistons of internal combustion engines.
  • the dimensions of the holding tubes according to the invention depend on the size of the core they are to carry.
  • the holding tubes can a Overall length, which is between 10 mm and 30 mm, the length of the stepped portion is between 3 mm and 7 mm.
  • the maximum diameter of the holding tube may depend on the diameter of the supply and discharge lines to the intended cavity in the casting and be between 3 mm and 20 mm.
  • the holding tubes have a diameter between 2 mm and 5 mm in the offset cylindrical part.
  • the wall thickness is between 0.1 mm and 0.6 mm.
  • the holding tubes may have a longitudinal slot or two opposite longitudinal slots which, adapted to the length and diameter, may have a length of between 1, 5 mm and 4 mm and a width of between 1 mm and 1, 5 mm.
  • the material of the holding tube depends on the material of the melt, with which it should not react as possible that the holding function is impaired.
  • the material of the holding tube can be made of V2A steel, for example.
  • the holding tubes are usually plugged onto another tube or inserted into an opening of a part of the mold.
  • the tube or the opening provides access to the core, so that after casting or spraying, when the workpiece is solidified, through this pipe or opening
  • Retaining tube is drilled to provide access to the core. Through this opening, the liquid dissolving the core is then fed and flushed the dissolved core.
  • a negative pressure can be applied to the holding tubes, whereby a degassing of the core during the casting or spraying process can be supported.
  • the negative pressure is matched to the core composition. In the case of salt cores, for example, the negative pressure is 0.2 bar.
  • Figure 1 is a side view of a salt core for an annular cooling channel with the view of its cross section with a holding tube
  • Figure 2 is a plan view of the approach of the salt core with the holding tube
  • Figure 3 is a side view of a holding tube, partially cut.
  • the exemplary embodiment shows the device for the cantilevered arrangement of an annular salt core, as it is used for shaping of cooling channels in pistons, in particular in pistons of internal combustion engines.
  • the annular cores are supported on its underside.
  • cup-shaped projections can be formed, in which the holding tubes are inserted.
  • the approaches mark at the same time the inflow and outflow openings of the cooling channels. Because of the piston wall thickness, these approaches must not extend much beyond the cross section of the cooling channel. On the other hand, the wall thickness of the approaches must be so large that they provide the holding tube the necessary support and the walls, especially on insertion, do not peel off. Hard cores are particularly sensitive.
  • An annular cooling passage in a piston may have, for example, an outer diameter of 75 mm and an oval cross section of 9 mm in height and 4 mm in width.
  • Figure 1 shows an annular core 1, in the present case a salt core, for a cooling channel of a piston with the view of its cross-section 2 with an inserted holding tube 3. The section passes through a cup-shaped projection 4, in which the holding tube 3 with its remote cylindrical Part 5 is stuck and the core 1 holds.
  • the approach 4 of the core 1 marks an inlet or outlet opening of the annular channel in the piston and is the point at which the cavity of the annular channel to be formed for the removal of the core 1 is drilled through the retaining tube 3. It extends a few millimeters beyond the bottom of the core 3.
  • the adjoining the stepped cylindrical part 5, undeformed part 6 of the holding tube 3 can be stuck with its end, not shown here, in another tube or the wall of a mold or in another core.
  • the stepped cylindrical part 5 of the holding tube 3 has two longitudinal and parallel slots 7. They increase the cross-sectional area of the discharge opening 8 in the case of possibly provided degassing of the core 1.
  • Figure 2 shows a plan view of the approach 4 with the inserted holding tube 3. It can be clearly seen that due to the reduced cross-section of the holding tube 3 in its remote cylindrical part 5 of the projection 4 does not extend substantially beyond the outer periphery of the core 1 and thus the Wall of the piston in the region of its cooling channel is not weakened.
  • FIG. 3 shows an example of a holding tube 3 according to the invention in a side view, partly in section. Its total length 9 is 18 mm, the length of the stepped part 10 is 6 mm and the length 11 of the stepped cylindrical part 5 inserted in the core is 4 mm long. In between is a conical part 12 of 2 mm in length. In the stepped cylindrical part 5, two parallel slots 7 are arranged with a length 13 of 2.5 mm and a width 14 of 1, 5 mm.
  • the undeformed part 6 of the holding tube 3 has a diameter 15 of 4 mm, the diameter 16 of the stepped cylindrical Part 5 is 3 mm.
  • the wall thickness 17 is 0.6 mm.
  • the material of the holding tube 3 is V2A steel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Coating Apparatus (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

In metallic components used in mechanical engineering design, particularly in motors, pumps, compressors or power plant systems, and which are manufactured using known casting and injection molding methods, it is frequently required that cavities be provided in cast or injection molded parts, for example channels for cooling media or lubricants. Furthermore, the shaping of a cast or injection molded part by undercutting can be hindered. In both cases, soluble cores are particularly suitable as placeholders of such cavities. As a device for self-supporting placement of a core in the mold of a casting device, said core able to be dissolved by a liquid solvent, the invention proposes that the device is a supporting tube (3), that the at least one supporting tube (3) has a reduced cylindrical part (5) and that this part (5) inserts into the core (1) and holds the core.

Description

Einrichtung zum Tragen von Kernen Device for carrying cores
Die Erfindung betrifft eine Einrichtung zur freitragenden Anordnung eines durch flüssige Lösungsmittel löslichen Kerns in der Form einer Gießvorrichtung.The invention relates to a device for the self-supporting arrangement of a liquid solvent-soluble core in the form of a casting apparatus.
Bei metallischen Bauteilen, die im Maschinenbau insbesondere in Motoren, Pumpen, Kompressoren oder Kraftwerksanlagen zum Einsatz kommen und mit den bekannten Gieß- und Spritzverfahren hergestellt werden, ist es häufig erforderlich, im Guss- oder Spritzteil Hohlräume, beispielsweise Kanäle für Kühloder Schmiermittel, vorzusehen. Weiterhin kann ein Ausformen eines Guss- oder Spritzteils durch Hinterschneidungen behindert werden. In beiden Fällen eignen sich als Platzhalter entsprechender Hohlräume besonders so genannte verlorene Kerne, das sind lösliche Kerne, die sich durch ein flüssiges Lösungsmittel auflösen lassen. Weil diese Kerne auf Grund ihrer Lage im Guss- oder Spritzteil von außen nicht zugänglich sind, werden sie durch dafür geschaffene Öffnungen im Gussoder Spritzteil aus dem vorgesehenen Hohlraum ausgeschwemmt. Besonders bevorzugt sind Kerne aus gebundenem Sand oder Salz, die sich im Wasser auflösen. Solche Kerne können auch beim Spritzen von Teilen aus Kunststoff eingesetzt werden.In the case of metallic components which are used in mechanical engineering, in particular in motors, pumps, compressors or power plants, and which are produced by the known casting and injection methods, it is often necessary to provide cavities, for example channels for coolants or lubricants, in the casting or injection part. Furthermore, a molding of a cast or injection molded part can be hindered by undercuts. In both cases, so-called lost cores, which are soluble cores that can be dissolved by a liquid solvent, are suitable as placeholders for corresponding cavities. Because these cores are not accessible from the outside due to their position in the cast or molded part, they are flushed out of the cavity provided by openings in the cast or molded part. Particularly preferred are cores of bound sand or salt, which dissolve in the water. Such cores can also be used when spraying parts made of plastic.
Bekannt ist beispielsweise die Problematik der Formgebung von Kühlkanälen in Kolben von Brennkraftmaschinen. Dort müssen die für die Formgebung eines ringförmigen Kühlkanals vorgesehenen Kerne frei in einem Raum gehalten werden, der vollständig mit Schmelze ausgefüllt wird.For example, the problem of shaping cooling channels in pistons of internal combustion engines is known. There, the cores provided for the shaping of an annular cooling channel must be kept free in a space which is completely filled with melt.
Eine Lösung dazu wird in der DE 10131725 B4 vorgestellt. Der Kern wird unter Krafteinwirkung auf einem Gießkern der Gießvorrichtung in vorgegebener Position gehalten, wobei diese Krafteinwirkung durch Vakuum oder Magnetismus aufgebracht wird. Beim Fixieren durch Magnetismus muss dem Kernwerkstoff ein magnetisierbarer Werkstoff beigemischt werden. Dieser muss sich aber rückstandsfrei entfernen lassen und darf nicht mit dem Gusswerkstoff reagieren. Beim Ansaugen mittels Vakuum muss sichergestellt sein, dass keine Schmelze angesaugt werden kann. Aus der DE 4238851 A1 ist eine Einrichtung zur Befestigung eines Salzkerns zur Abformung eines Kühlkanals in einem Kolben bekannt, bei der der Salzkern an der beweglichen Formhälfte der Kokille mittels Haltestifte befestigt ist, die jeweils in eine Pinole einrasten. Diese Lösung ist konstruktiv aufwendig.A solution to this problem is presented in DE 10131725 B4. The core is held in a predetermined position under the action of force on a casting core of the casting device, this force being applied by means of vacuum or magnetism. When fixing by magnetism, a magnetizable material must be added to the core material. However, this must be able to be removed without residue and must not react with the cast material. When sucking by vacuum, it must be ensured that no melt can be sucked in. From DE 4238851 A1 a device for fixing a salt core for molding a cooling channel in a piston is known, in which the salt core is attached to the movable mold half of the mold by means of retaining pins which each engage in a quill. This solution is structurally complex.
Aufgabe der Erfindung ist es, eine konstruktiv einfache mechanische Einrichtung zur freitragenden Anordnung eines durch flüssige Lösungsmittel löslichen Kerns in der Form einer Gießvorrichtung vorzustellen.The object of the invention is to present a structurally simple mechanical device for the cantilevered arrangement of a liquid solvent-soluble core in the form of a casting device.
Die Lösung der Aufgabe erfolgt mit Hilfe der kennzeichnenden Merkmale des ersten Anspruchs. Vorteilhafte Ausgestaltungen der Erfindung werden in den abhängigen Ansprüchen beansprucht.The object is achieved by means of the characterizing features of the first claim. Advantageous embodiments of the invention are claimed in the dependent claims.
Als erfindungsgemäße Einrichtung zur freitragenden Anordnung eines durch flüssige Lösungsmittel löslichen Kerns in der Form einer Gießvorrichtung dienen speziell dafür geformte Halteröhrchen. Von diesen Halteröhrchen wird ein Ende in den Kern eingesetzt und das andere Ende in die Kokillenwand oder in einen anderen Teil der Gießform, beispielsweise einen weiteren Kern. Durch ein oder mehrere Halteröhrchen wird dann der Kern gehalten. Das Halteröhrchen weist erfindungsgemäß an dem im Kern eingesetzten Ende einen geringeren Querschnitt auf als das Ende, mit dem es in andere Teile der Gießform eingesetzt ist. Die Einrichtung in Form eines Halteröhrchens hat den Vorteil, dass sie insbesondere für Kerne einsetzbar ist, die einen geringen Querschnitt haben. Solche Kerne sind beispielsweise die ringförmigen Kerne, wie sie zur Formgebung von Kühlkanälen in Kolben eingesetzt werden, insbesondere in Kolben von Verbrennungskraftmaschinen.As a device according to the invention for the self-supporting arrangement of a liquid solvent-soluble core in the form of a casting device are specially designed holding tubes. Of these holding tubes, one end is inserted into the core and the other end into the mold wall or into another part of the mold, for example a further core. The core is then held by one or more holding tubes. According to the invention, the holding tube has a smaller cross-section at the end inserted in the core than the end with which it is inserted into other parts of the casting mold. The device in the form of a holding tube has the advantage that it can be used in particular for cores which have a small cross-section. Such cores are, for example, the annular cores, as they are used for shaping of cooling channels in pistons, in particular in pistons of internal combustion engines.
Die Abmessungen der erfindungsgemäßen Halteröhrchen richten sich nach der Größe des Kerns, den sie tragen sollen. Die Halteröhrchen können eine Gesamtlänge haben, die zwischen 10 mm und 30 mm liegt, wobei die Länge des abgesetzten Teils zwischen 3 mm und 7 mm liegt. Der Maximaldurchmesser des Halteröhrchens kann sich nach dem Durchmesser der Zu- und Ableitungen zum vorgesehenen Hohlraum im Gussteil richten und zwischen 3 mm und 20 mm liegen. Die Halteröhrchen haben im abgesetzten zylindrischen Teil einen Durchmesser zwischen 2 mm und 5 mm. Die Wandstärke liegt zwischen 0,1 mm und 0,6 mm. In ihrem abgesetzten zylindrischen Teil können die Halteröhrchen einen Längsschlitz oder zwei gegenüberliegende Längsschlitze aufweisen, die, angepasst an Länge und Durchmesser, eine Länge zwischen 1 ,5 mm und 4 mm und eine Breite zwischen 1 mm und 1 ,5 mm haben können.The dimensions of the holding tubes according to the invention depend on the size of the core they are to carry. The holding tubes can a Overall length, which is between 10 mm and 30 mm, the length of the stepped portion is between 3 mm and 7 mm. The maximum diameter of the holding tube may depend on the diameter of the supply and discharge lines to the intended cavity in the casting and be between 3 mm and 20 mm. The holding tubes have a diameter between 2 mm and 5 mm in the offset cylindrical part. The wall thickness is between 0.1 mm and 0.6 mm. In their offset cylindrical part, the holding tubes may have a longitudinal slot or two opposite longitudinal slots which, adapted to the length and diameter, may have a length of between 1, 5 mm and 4 mm and a width of between 1 mm and 1, 5 mm.
Der Werkstoff der Halteröhrchen richtet sich nach dem Werkstoff der Schmelze, mit dem er möglichst nicht so reagieren soll, dass die Haltefunktion beeinträchtigt wird. Der Werkstoff der Halteröhrchen kann beispielsweise aus V2A-Stahl sein.The material of the holding tube depends on the material of the melt, with which it should not react as possible that the holding function is impaired. The material of the holding tube can be made of V2A steel, for example.
Die Halteröhrchen werden in der Regel auf ein weiteres Rohr aufgesteckt oder in eine Öffnung eines Teils der Form eingesteckt. In der Regel bietet das Rohr bzw. die Öffnung einen Zugang zum Kern, so dass nach dem Gießen oder Spritzen, wenn das Werkstück erstarrt ist, durch dieses Rohr oder diese Öffnung dasThe holding tubes are usually plugged onto another tube or inserted into an opening of a part of the mold. In general, the tube or the opening provides access to the core, so that after casting or spraying, when the workpiece is solidified, through this pipe or opening
Halteröhrchen aufgebohrt wird, um einen Zugang zum Kern zu verschaffen. Durch diese Öffnung wird dann die den Kern auflösende Flüssigkeit zugeführt und der aufgelöste Kern ausgeschwemmt.Retaining tube is drilled to provide access to the core. Through this opening, the liquid dissolving the core is then fed and flushed the dissolved core.
An die Halteröhrchen kann ein Unterdruck angelegt werden, wodurch eine Entgasung des Kerns während des Gieß- oder Spritzvorgangs unterstützt werden kann. Durch den Schlitz oder die Schlitze im abgesetzten zylindrischen Teil des Halteröhrchens wird die Fläche der Öffnung des Halteröhrchens größer und dadurch die Entgasung unterstützt. Der Unterdruck wird auf die Kernzusammensetzung abgestimmt. Bei Salzkernen beispielsweise beträgt der Unterdruck 0,2 bar. An Hand eines Ausführungsbeispiels wird die Erfindung näher erläutert. Es zeigen, jeweils im vergrößerten Maßstab:A negative pressure can be applied to the holding tubes, whereby a degassing of the core during the casting or spraying process can be supported. Through the slot or slots in the remote cylindrical part of the holding tube, the area of the opening of the holding tube is larger and thereby supports the degassing. The negative pressure is matched to the core composition. In the case of salt cores, for example, the negative pressure is 0.2 bar. With reference to an embodiment of the invention will be explained in more detail. It shows, in each case on an enlarged scale:
Figur 1 die Seitenansicht eines Salzkerns für einen ringförmigen Kühlkanal mit der Ansicht seines Querschnitts mit einem Halteröhrchen, Figur 2 die Aufsicht auf den Ansatz des Salzkerns mit dem Halteröhrchen und Figur 3 die Seitenansicht eines Halteröhrchens, teilweise geschnitten.Figure 1 is a side view of a salt core for an annular cooling channel with the view of its cross section with a holding tube, Figure 2 is a plan view of the approach of the salt core with the holding tube and Figure 3 is a side view of a holding tube, partially cut.
Das Ausführungsbeispiel zeigt die Einrichtung zur freitragenden Anordnung eines ringförmigen Salzkerns, wie er zur Formgebung von Kühlkanälen in Kolben eingesetzt wird, insbesondere in Kolben von Verbrennungskraftmaschinen.The exemplary embodiment shows the device for the cantilevered arrangement of an annular salt core, as it is used for shaping of cooling channels in pistons, in particular in pistons of internal combustion engines.
Weil die Zu- und Abflussöffnungen der Kühlkanäle in der Regel in deren untere Seite münden, werden die ringförmigen Kerne auf ihrer Unterseite abgestützt. An den Kernen können napfförmige Ansätze angeformt sein, in denen die Halteröhrchen eingeschoben werden. Die Ansätze markieren gleichzeitig die Zu- und Abflussöffnungen der Kühlkanäle. Wegen der Kolbenwandstärke dürfen diese Ansätze nicht wesentlich über den Querschnitt des Kühlkanals hinausreichen. Andererseits muss die Wandstärke der Ansätze so groß sein, dass sie den Halteröhrchen den erforderlichen Halt bieten und die Wände, insbesondere beim Einschieben, nicht abplatzen. Empfindlich sind insbesondere harte Kerne.Because the inflow and outflow openings of the cooling channels usually open into the lower side, the annular cores are supported on its underside. On the cores cup-shaped projections can be formed, in which the holding tubes are inserted. The approaches mark at the same time the inflow and outflow openings of the cooling channels. Because of the piston wall thickness, these approaches must not extend much beyond the cross section of the cooling channel. On the other hand, the wall thickness of the approaches must be so large that they provide the holding tube the necessary support and the walls, especially on insertion, do not peel off. Hard cores are particularly sensitive.
Durch ihre abgesetzte Form haben die Halteröhrchen den Vorteil, dass die Ansätze des Kerns nicht wesentlich über seinen Querschnitt hinausreichen müssen und trotzdem genügend Wandstärke verbleibt, um dem Halteröhrchen den erforderlichen Halt zu bieten, damit der Kern abgestützt und gehalten werden kann. Das ist insbesondere bei Salzkernen vorteilhaft. Ein ringförmiger Kühlkanal in einem Kolben kann beispielsweise einen Außendurchmesser von 75 mm und einen ovalen Querschnitt von 9 mm Höhe und 4 mm Breite haben. Figur 1 zeigt einen ringförmigen Kern 1 , im vorliegenden Fall einen Salzkern, für einen Kühlkanal eines Kolbens mit der Ansicht seines Querschnitts 2 mit einem eingesetzten Halteröhrchen 3. Der Schnitt geht mittig durch einen napfförmigen Ansatz 4, in dem das Halteröhrchen 3 mit seinem abgesetzten zylindrischen Teil 5 steckt und den Kern 1 hält. Der Ansatz 4 des Kerns 1 markiert eine Zu- oder Abflussöffnung des Ringkanals im Kolben und ist die Stelle, an der der zu bildende Hohlraum der Ringkanals zur Beseitigung des Kerns 1 durch das Halteröhrchen 3 angebohrt wird. Er reicht wenige Millimeter über die Unterseite des Kerns 3 hinaus.Due to their stepped shape, the holding tubes have the advantage that the lugs of the core do not have to extend much beyond its cross-section and still enough wall thickness remains to provide the holding tube the necessary support so that the core can be supported and held. This is particularly advantageous with salt cores. An annular cooling passage in a piston may have, for example, an outer diameter of 75 mm and an oval cross section of 9 mm in height and 4 mm in width. Figure 1 shows an annular core 1, in the present case a salt core, for a cooling channel of a piston with the view of its cross-section 2 with an inserted holding tube 3. The section passes through a cup-shaped projection 4, in which the holding tube 3 with its remote cylindrical Part 5 is stuck and the core 1 holds. The approach 4 of the core 1 marks an inlet or outlet opening of the annular channel in the piston and is the point at which the cavity of the annular channel to be formed for the removal of the core 1 is drilled through the retaining tube 3. It extends a few millimeters beyond the bottom of the core 3.
Der sich an dem abgesetzten zylindrischen Teil 5 anschließende, nicht verformte Teil 6 des Halteröhrchens 3 kann mit seinem Ende, wie hier nicht dargestellt, in einem weiteren Rohr oder der Wand einer Kokille oder in einem weiteren Kern stecken. Der abgesetzte zylindrische Teil 5 des Halteröhrchens 3 weist zwei längs und parallel verlaufende Schlitze 7 auf. Sie vergrößern die Querschnittsfläche der Abzugsöffnung 8 bei einem eventuell vorgesehenen Entgasen des Kerns 1.The adjoining the stepped cylindrical part 5, undeformed part 6 of the holding tube 3 can be stuck with its end, not shown here, in another tube or the wall of a mold or in another core. The stepped cylindrical part 5 of the holding tube 3 has two longitudinal and parallel slots 7. They increase the cross-sectional area of the discharge opening 8 in the case of possibly provided degassing of the core 1.
Figur 2 zeigt eine Aufsicht auf den Ansatz 4 mit dem eingesteckten Halteröhrchen 3. Deutlich zu sehen ist, dass auf Grund des verringerten Querschnitts des Halteröhrchens 3 in seinem abgesetzten zylindrischen Teil 5 der Ansatz 4 nicht wesentlich über den Außenumfang des Kerns 1 hinausreicht und damit die Wand des Kolbens im Bereich seines Kühlkanals nicht geschwächt wird.Figure 2 shows a plan view of the approach 4 with the inserted holding tube 3. It can be clearly seen that due to the reduced cross-section of the holding tube 3 in its remote cylindrical part 5 of the projection 4 does not extend substantially beyond the outer periphery of the core 1 and thus the Wall of the piston in the region of its cooling channel is not weakened.
Figur 3 zeigt ein Beispiel für ein erfindungsgemäßes Halteröhrchen 3 in der Seitenansicht, teilweise geschnitten. Seine Gesamtlänge 9 beträgt 18 mm, die Länge des abgesetzten Teils 10 ist 6 mm und davon die Länge 11 des abgesetzten zylindrischen Teils 5, der in dem Kern steckt, 4 mm lang. Dazwischen liegt ein konischer Teil 12 von 2 mm Länge. Im abgesetzten zylindrischen Teil 5 sind zwei parallele Schlitze 7 mit einer Länge 13 von 2,5 mm und einer Breite 14 von 1 ,5 mm angeordnet. Der unverformte Teil 6 des Halteröhrchens 3 hat einen Durchmesser 15 von 4 mm, der Durchmesser 16 des abgesetzten zylindrischen Teils 5 beträgt 3 mm. Die Wandstärke 17 beträgt 0,6 mm. Der Werkstoff des Halteröhrchens 3 ist V2A-Stahl. FIG. 3 shows an example of a holding tube 3 according to the invention in a side view, partly in section. Its total length 9 is 18 mm, the length of the stepped part 10 is 6 mm and the length 11 of the stepped cylindrical part 5 inserted in the core is 4 mm long. In between is a conical part 12 of 2 mm in length. In the stepped cylindrical part 5, two parallel slots 7 are arranged with a length 13 of 2.5 mm and a width 14 of 1, 5 mm. The undeformed part 6 of the holding tube 3 has a diameter 15 of 4 mm, the diameter 16 of the stepped cylindrical Part 5 is 3 mm. The wall thickness 17 is 0.6 mm. The material of the holding tube 3 is V2A steel.

Claims

Patentansprüche claims
1. Einrichtung zur freitragenden Anordnung eines durch flüssige Lösungsmittel löslichen Kerns in der Form einer Gießvorrichtung, dadurch gekennzeichnet, dass die Einrichtung mindestens ein Halteröhrchen 3 ist, dass das Halteröhrchen 3 einen abgesetzten zylindrischen Teil 5 hat und dass dieser abgesetzte zylindrische Teil 5 in dem zu haltenden Kern 1 steckt und den Kern hält.1. A device for the cantilevered arrangement of a liquid solvent-soluble core in the form of a casting apparatus, characterized in that the device is at least one holding tube 3, that the holding tube 3 has a stepped cylindrical portion 5 and that this offset cylindrical portion 5 in the holding core 1 and holding the core.
2. Einrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der abgesetzte zylindrische Teil 5 des Halteröhrchens 3 auf die Abmessung des Kerns abgestimmt ist.2. Device according to claim 1, characterized in that the stepped cylindrical part 5 of the holding tube 3 is matched to the dimension of the core.
3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Halteröhrchen 3 in einem Ansatz 4 des zu haltenden Kerns 1 steckt.3. Device according to claim 1 or 2, characterized in that the holding tube 3 is inserted in a neck 4 of the core 1 to be held.
4. Einrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Halteröhrchen 3 einen Zugang zu dem durch den Kern 1 zu bildenden Hohlraum markiert.4. Device according to one of claims 1 to 3, characterized in that the holding tube 3 marks an access to the cavity 1 to be formed by the core.
5. Einrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Halteröhrchen 3 die Öffnung markiert, durch die der aufgelöste Kern ausschwemmbar ist.5. Device according to one of claims 1 to 4, characterized in that the holding tube 3 marks the opening through which the dissolved core is ausschwemmbar.
6. Einrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Halteröhrchen 3 unterhalb des Kerns 1 angeordnet ist.6. Device according to one of claims 1 to 5, characterized in that the holding tube 3 is arranged below the core 1.
7. Einrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der abgesetzte zylindrische Teil 5 des Halteröhrchens 3 mindestens einen Schlitz aufweist. 7. Device according to one of claims 1 to 6, characterized in that the offset cylindrical portion 5 of the holding tube 3 has at least one slot.
8. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, dass der abgesetzte zylindrische Teil 5 des Halteröhrchens 3 zwei parallel und längs angeordnete Schlitze 7 aufweist.8. A device according to claim 7, characterized in that the offset cylindrical portion 5 of the holding tube 3 has two parallel and longitudinally arranged slots 7.
9. Einrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Halteröhrchen 3 eine Gesamtlänge 9 hat, die zwischen 10 mm und9. Device according to one of claims 1 to 8, characterized in that the holding tube 3 has an overall length 9, between 10 mm and
30 mm liegt, dass die Länge des abgesetzten Teils 10 zwischen 3 mm und 7 mm liegt, dass der Durchmesser 15 des nicht verformten Teils 6 zwischen 3 mm und 20 mm und der Durchmesser 16 des abgesetzten zylindrischen Teils 5 zwischen 2 mm und 5 mm liegt und dass die Wandstärke zwischen 0,1 mm und 0,6 mm liegt.30 mm, that the length of the stepped portion 10 is between 3 mm and 7 mm, that the diameter 15 of the undeformed portion 6 is between 3 mm and 20 mm and the diameter 16 of the stepped cylindrical portion 5 is between 2 mm and 5 mm and that the wall thickness is between 0.1 mm and 0.6 mm.
10. Einrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass der mindestens eine Schlitz 7 in dem abgesetzten zylindrischen Teil 5 des Halteröhrchens 3 eine Länge zwischen 1 ,5 mm und 4 mm und eine Breite zwischen 0,5 mm und 1 ,5 mm hat.10. Device according to one of claims 7 to 9, characterized in that the at least one slot 7 in the remote cylindrical part 5 of the holding tube 3 has a length between 1, 5 mm and 4 mm and a width between 0.5 mm and 1, 5 mm.
11. Einrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass das Halteröhrchen 3 in einen ringförmigen Kern 1 einsetzbar ist.11. Device according to one of claims 1 to 10, characterized in that the holding tube 3 can be inserted into an annular core 1.
12. Einrichtung nach einem der Ansprüche 1 bis 11 , dadurch gekennzeichnet, dass das Halteröhrchen 3 in einen Salzkern 1 einsetzbar ist. 12. Device according to one of claims 1 to 11, characterized in that the holding tube 3 can be inserted into a salt core 1.
EP09780067.6A 2008-07-17 2009-07-01 Device for carrying cores Not-in-force EP2313219B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09780067T PL2313219T3 (en) 2008-07-17 2009-07-01 Device for carrying cores

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008040507A DE102008040507A1 (en) 2008-07-17 2008-07-17 Device for carrying cores
PCT/EP2009/058276 WO2010006925A1 (en) 2008-07-17 2009-07-01 Device for carrying cores

Publications (2)

Publication Number Publication Date
EP2313219A1 true EP2313219A1 (en) 2011-04-27
EP2313219B1 EP2313219B1 (en) 2013-09-25

Family

ID=41131761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09780067.6A Not-in-force EP2313219B1 (en) 2008-07-17 2009-07-01 Device for carrying cores

Country Status (8)

Country Link
EP (1) EP2313219B1 (en)
CN (1) CN102159343B (en)
BR (1) BRPI0915999A2 (en)
DE (1) DE102008040507A1 (en)
MX (1) MX2011000504A (en)
PL (1) PL2313219T3 (en)
RU (1) RU2502580C2 (en)
WO (1) WO2010006925A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010002999A1 (en) * 2010-03-18 2011-09-22 Maxicore Gmbh Producing casting piece with cavity, comprises producing core soluble by liquid solvent with hole to receive retaining pin, fastening first end of the pin into the hole, and fastening second end of the pin to casting mold of casting device
DE102011086411A1 (en) * 2011-11-15 2013-05-16 Mahle International Gmbh Mold for a piston
CN102728789A (en) * 2012-07-24 2012-10-17 湖南江滨机器（集团）有限责任公司 Hot molding method and preheating method for piston mold
GB202113798D0 (en) 2021-09-27 2021-11-10 Univ Tartu Microfluidics method

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DE1250605B (en) * 1964-10-14 1967-09-21 Karl Schmidt Ges Mit Beschraen Device for the self-supporting fastening of core parts pressed from sand or salt
DE4238851A1 (en) 1992-11-18 1994-05-19 Kolbenschmidt Ag Salt core for aluminium@ alloy piston mould - fixed in position by mounting pins locating in movable mould half
CN1106324A (en) * 1994-02-07 1995-08-09 北京粉末冶金研究所 injection moulding method for metal chamber type products
RU2098229C1 (en) * 1995-06-29 1997-12-10 Георгий Петрович Савин Plunger chill mould
JP3548369B2 (en) * 1997-02-17 2004-07-28 株式会社日立ユニシアオートモティブ Internal combustion engine piston
DE10131725B4 (en) 2001-06-29 2004-02-12 Ks Kolbenschmidt Gmbh Salt core held under force in the casting device
JP4068918B2 (en) * 2002-08-01 2008-03-26 本田技研工業株式会社 Keren used on the core
JP2006102750A (en) * 2004-09-30 2006-04-20 Mazda Motor Corp Chaplet and structure for fitting chaplet to core

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Also Published As

Publication number Publication date
WO2010006925A1 (en) 2010-01-21
CN102159343B (en) 2015-03-25
PL2313219T3 (en) 2014-04-30
EP2313219B1 (en) 2013-09-25
BRPI0915999A2 (en) 2019-04-09
DE102008040507A1 (en) 2010-01-21
RU2011105722A (en) 2012-08-27
CN102159343A (en) 2011-08-17
MX2011000504A (en) 2011-04-21
RU2502580C2 (en) 2013-12-27

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