EP0881013A1 - Method for connection foundry cores - Google Patents

Method for connection foundry cores Download PDF

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Publication number
EP0881013A1
EP0881013A1 EP98109522A EP98109522A EP0881013A1 EP 0881013 A1 EP0881013 A1 EP 0881013A1 EP 98109522 A EP98109522 A EP 98109522A EP 98109522 A EP98109522 A EP 98109522A EP 0881013 A1 EP0881013 A1 EP 0881013A1
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Prior art keywords
cores
channels
mixture
core
injection
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EP98109522A
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German (de)
French (fr)
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EP0881013B1 (en
Inventor
Erfindernennung liegt noch nicht vor Die
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FRITZ HANSBERG S.P.A.
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Fitz Hansberg SpA
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    • 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
    • B22C9/103—Multipart cores

Definitions

  • the invention relates to a method for connecting several casting cores according to the preamble of the claim 1.
  • the casting cores are made by compressing the molding material, consisting of a mixture of sand and binder in a core formwork or a core box, produced. Thereupon, depending on which binder used to polymerize the binder by means of heating (method with a warm core box) or by applying a suitable one gaseous catalyst (process with cold Core box, gold box process).
  • connection by means of metallic Thread tie rods by means of gluing with cold or Hot gluing and the connection by forming axial connector cores most common.
  • U.S. Patent 4,932,459 relates a process by which a core package with the help of blowing one or more axial connection cores through axial grooves or axial holes with each other be connected in each of the connected Cores are provided. Such a process is based on the effect of a positive connection, the Wedging from the one or more axial connecting cores is formed.
  • connection via anchors or gluing have disadvantages, which are related to technologies for which specific experiences are often missing in a foundry.
  • the present invention is therefore based on the object the disadvantages of the aforementioned methods overcome and a process for connecting casting cores to create that compared to the known Procedure represents a simplification and a larger one Design freedom with regard to the core design consists.
  • the invention sees in an advantageous Show the individual cores together to weld, using a mixture as welding material of sand and binders as in the "process with cold core box "is used.
  • the invention therefore enables the perfect connection of two or more casting cores previously formed and assembled by injection the mixture into suitable channels that were previously on one or both contact surfaces between one and the other core have been provided (This means channels, their course or axis in the Connection level between the cores). The curing the mixture caused by the gas supply then welding the cores together.
  • the core shooter blows with the help of the firing plate the sweat mixture into the channels, the sweat mixture binds intimately to the surrounding core material, namely in the sense of welding and not in Meaning of a bond.
  • the firing plate causes the injection at the injection points of the respective Channels takes place, namely on the outside Outlet openings of the channels.
  • Fig. 1 shows how the individual cores 11 within one not shown are composed, which guarantees mutual correct positioning. Such positioning can be done with the help of Centering and reference devices are achieved, on the contact surfaces 12 between the cores are provided. Alternatively, especially around ultimately the precision of the dimension of the package 14 in the event that the packets are formed from several cores are, the individual cores 11 assembled in facilities that are even without contact among the Core the axis distance between one and the other Determine core 11. This way, smaller ones Tolerances in the dimension of the individual cores balanced be even adding gaps between the cores can be approved.
  • the dimensions and position of the wedge or the wedges are significantly limited by requirements due to the constructive and functional Properties of the cores to be connected (e.g. existence of adhesive channels), ultimately allows the described Process the connection surfaces between to choose the cores with great freedom of design. In this way it is possible to weld the surface by means of a suitable design of the channels to maximize their shape and dimension in simpler Way depending on the specific form of the to be connected Cores can be optimized.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Induction Machinery (AREA)

Abstract

The method concerns joining of two or more casting cores, according to which cores (11) produced beforehand are welded together. Joining is effected using a mixture of sand and a bonding agent which is injected into channels (13). The channels are made beforehand on at least one of their contact surface (12). The method includes the following steps: a) the cores (11) with channels (13) are placed into fixtures which ensure their mutually correct position, and resist forces produced by the injection and gas delivery process; b) injection is carried out using a core shooting machine which has an appropriate shooting plate and a hood for gas delivery.

Description

Die Erfindung betrifft ein Verfahren zum Verbinden von mehreren Gießkernen nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for connecting several casting cores according to the preamble of the claim 1.

Die Gießkerne werden durch Verdichtung des Formmaterials, bestehend aus einer Mischung aus Sand und Bindemittel in einer Kernformschalung oder einem Kernkasten, hergestellt. Daraufhin wird je nachdem welche Bindemittel verwendet werden, die Polymerisation des Bindemittels mittels Erhitzung (Verfahren mit warmen Kernkasten) oder mittels der Beaufschlagung mit einem geeigneten gasförmigen Katalysator (Verfahren mit kaltem Kernkasten, Gold box-Verfahren) bewirkt.The casting cores are made by compressing the molding material, consisting of a mixture of sand and binder in a core formwork or a core box, produced. Thereupon, depending on which binder used to polymerize the binder by means of heating (method with a warm core box) or by applying a suitable one gaseous catalyst (process with cold Core box, gold box process).

Gegenwärtig sind verschiedene Systeme bekannt, mittels derer zwei oder mehrere Gießkerne zusammengefügt werden, um ein einziges Paket oder einen einzigen Block zu bilden. Various systems are currently known by means of whose two or more casting cores are put together, to a single package or block form.

Unter den verschiedenen in der Industrie verwendeten Methoden sind die Verbindung mittels metallischer Gewinde-Zuganker, mittels Verklebung mit Kalt- oder Warmklebern und die Verbindung mittels Bildung von axialen Verbindungskernen am meisten verbreitet.Among the various used in the industry Methods are the connection by means of metallic Thread tie rods, by means of gluing with cold or Hot gluing and the connection by forming axial connector cores most common.

Insbesondere bezieht sich das US-Patent 4,932,459 auf ein Verfahren, mit dem ein Kernpaket mit Hilfe des Einblasens einer oder mehrerer axialer Verbindungskerne durch axiale Auskehlungen oder axiale Löcher miteinander verbunden werden, die in jedem der zu verbindenden Kerne vorgesehen sind. Ein solches Verfahren beruht auf den Effekt einer formschlüssigen Verbindung, wobei die Verkeilung aus dem einen oder mehreren axialen Verbindungskernen gebildet ist.In particular, U.S. Patent 4,932,459 relates a process by which a core package with the help of blowing one or more axial connection cores through axial grooves or axial holes with each other be connected in each of the connected Cores are provided. Such a process is based on the effect of a positive connection, the Wedging from the one or more axial connecting cores is formed.

Die beiden zuerst genannten Verbindungsmethoden (Verschraubung über Anker bzw. Verklebung) haben Nachteile, die in Verbindung stehen zu Technologien, für die häufig in einer Gießerei spezifische Erfahrungen fehlen.The first two connection methods mentioned (screw connection via anchors or gluing) have disadvantages, which are related to technologies for which specific experiences are often missing in a foundry.

Die dritte oben erwähnte Methode (formschlüssige Verbindung mit Hilfe axialer Verbindungskerne) weist erhebliche Beschränkungen hinsichtlich der Definition der Dimensionen, der Unterteilungen und der Anordnung des oder der formschlüssigen Kerne.The third method mentioned above (positive connection with the help of axial connecting cores) exhibits considerable Limitations on the definition of Dimensions, the subdivisions and the arrangement of the or the positive cores.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, die Nachteile der vorgenannten Verfahren zu überwinden und ein Verfahren zum Verbinden von Gießkernen zu schaffen, das im Vergleich zu den bekannten Verfahren eine Vereinfachung darstellt und eine größere Gestaltungsfreiheit hinsichtlich der Kerngestaltung besteht. The present invention is therefore based on the object the disadvantages of the aforementioned methods overcome and a process for connecting casting cores to create that compared to the known Procedure represents a simplification and a larger one Design freedom with regard to the core design consists.

Zur Lösung dieser Aufgabe dienen die Merkmale des Anspruchs 1.The features of the claim serve to solve this problem 1.

Zum Erreichen dieses Ziels sieht die Erfindung in vorteilhafter Weise vor, die einzelnen Kerne miteinander zu verschweißen, wobei als Schweißmaterial eine Mischung von Sand und Bindemittel wie es beim "Verfahren mit kaltem Kernkasten" verwendet wird.To achieve this goal, the invention sees in an advantageous Show the individual cores together to weld, using a mixture as welding material of sand and binders as in the "process with cold core box "is used.

Die Erfindung ermöglicht demzufolge die perfekte Verbindung von zwei oder mehreren Gießkernen, die zuvor gebildet und zusammengefügt worden sind, durch Injektion der Mischung in geeignete Kanäle, die zuvor auf einer oder gleichzeitig beiden Kontaktoberflächen zwischen einem und dem anderen Kern vorgesehen worden sind (dies bedeutet, Kanäle, deren Verlauf oder Achse in der Verbindungsebene zwischen den Kernen liegt). Die Aushärtung der Mischung mit Hilfe der Gaszufuhr verursacht dann das Verschweißen der Kerne untereinander.The invention therefore enables the perfect connection of two or more casting cores previously formed and assembled by injection the mixture into suitable channels that were previously on one or both contact surfaces between one and the other core have been provided (This means channels, their course or axis in the Connection level between the cores). The curing the mixture caused by the gas supply then welding the cores together.

Im einzelnen sieht das erfindungsgemäße Verfahren folgende Schritte vor:

  • Vorsehen von geeigneten Kanälen auf mindestens einer oder beiden der sich gegenüberliegenden Oberflächen der Kerne während der Kernbildung,
  • Zusammenfügen der einzelnen Kerne in Einrichtungen, die die korrekte gegenseitige Ausrichtung gewährleisten,
  • Blockade des auf diese Weise erhaltenen Paketes mittels einer Einrichtung, die geeignet ist, eine adäquate Gegenkraft zu den während der Schußphasen und während der Gaszufuhr zu der Schweißmischung erzeugten Kräfte zu sichern, und
  • Injektion der Schweißmischung in das Innere der vorgeformten Kanäle mittels Verwendung einer Kernschießmaschine, die geeigneterweise mit einer Schußplatte und einer Haube zur Gaszufuhr ausgestattet ist, um das Erreichen der Injektionspunkte zu garantieren.
The method according to the invention provides the following steps:
  • Providing suitable channels on at least one or both of the opposing surfaces of the cores during core formation,
  • Assembling the individual cores in facilities that ensure correct mutual alignment,
  • Blocking of the package thus obtained by means of a device capable of ensuring an adequate counterforce to the forces generated during the shooting phases and during the gas supply to the welding mixture, and
  • Injecting the sweat mixture into the interior of the preformed channels using a core shooter suitably equipped with a firing plate and a gas supply hood to ensure that the injection points are reached.

Die Kernschießmaschine bläst mit Hilfe der Schußplatte die Schweißmischung in die Kanäle, wobei die Schweißmischung sich innig mit dem umliegenden Kernmaterial verbindet, nämlich im Sinne eines Schweißens und nicht im Sinne einer Verklebung. Die Schußplatte bewirkt, daß die Injektion an den Injektionspunkten der jeweiligen Kanäle erfolgt, nämlich an den nach außen tretenden Austrittsöffnungen der Kanäle.The core shooter blows with the help of the firing plate the sweat mixture into the channels, the sweat mixture binds intimately to the surrounding core material, namely in the sense of welding and not in Meaning of a bond. The firing plate causes the injection at the injection points of the respective Channels takes place, namely on the outside Outlet openings of the channels.

Die struktualen und funktionalen Eigenschaften und die Vorteile des Verbindungsverfahrens für Gießkerne der vorliegenden Erfindung gehen aus der nachfolgenden Beschreibung unter Bezugnahme auf die schematischen Zeichnungen hervor.The structural and functional properties and the Advantages of the connection process for casting cores present invention will be apparent from the following description with reference to the schematic Drawings.

Es zeigen:

Fig. 1
eine perspektivische Ansicht eines durch das erfindungsgemäße Verfahren erhaltenen Kernpaketes, und
Fig. 2
zwei Kerne des Kernpaketes aus Fig. 1 in einer Explosionsdarstellung, um die anliegenden Oberflächen darzustellen.
Show it:
Fig. 1
a perspective view of a core package obtained by the inventive method, and
Fig. 2
1 in an exploded view to show the adjacent surfaces.

In den Zeichnungen ist ersichtlich, wie einzelne Gießkerne 11 ausgebildet werden, und in dem Beispiel werden einige von ihnen mit Kanälen oder Aushöhlungen 13 auf wenigstens eine Kontaktfläche oder Kontaktoberfläche 12 zwischen einem Kern und dem anderen Kern versehen.In the drawings it can be seen how individual casting cores 11 are formed, and in the example some of them with channels or hollows 13 at least one contact surface or contact surface 12 between one core and the other core.

Fig. 1 zeigt wie die einzelnen Kerne 11 innerhalb einer nicht dargestellten Einrichtung zusammengesetzt sind, die eine gegenseitige korrekte Positionierung garantiert. Eine solche Positionierung kann mit Hilfe von Zentrierungen und Referenzeinrichtungen erzielt werden, die auf den Kontaktoberflächen 12 zwischen den Kernen vorgesehen sind. Alternativ können, insbesondere um letztendlich die Präzision der Dimension des Paketes 14 in dem Fall, daß die Pakete aus mehreren Kernen gebildet sind, die einzelnen Kerne 11 in Einrichtungen zusammengesetzt werden, die selbst ohne Kontakt unter den Kernen den Achsenabstand zwischen einem und dem anderen Kern 11 bestimmen. Auf diese Weise können kleinere Toleranzen in der Dimension der Einzelkerne ausgeglichen werden, indem sogar Lücken zwischen den Kernen zugelassen werden können.Fig. 1 shows how the individual cores 11 within one not shown are composed, which guarantees mutual correct positioning. Such positioning can be done with the help of Centering and reference devices are achieved, on the contact surfaces 12 between the cores are provided. Alternatively, especially around ultimately the precision of the dimension of the package 14 in the event that the packets are formed from several cores are, the individual cores 11 assembled in facilities that are even without contact among the Core the axis distance between one and the other Determine core 11. This way, smaller ones Tolerances in the dimension of the individual cores balanced be even adding gaps between the cores can be approved.

Das beschriebene Verfahren hat erhebliche Vorteile im Vergleich zu den derzeitig in der Industrie verwendeten Kernverbindungsverfahren, die einleitend zusammenfassend beschrieben sind.The method described has significant advantages in Comparison to those currently used in the industry Core joining procedures, the introductory summary are described.

Insbesondere kann festgestellt werden, daß das beschriebene Verfahren auf einer Technologie beruht, die analog zu der bereits für die Bildung der untereinander zu verbindenden Kernen benutzten Technologie ist. Insofern vermeidet das Verfahren Ungewissheiten und Uneffizienzen, die normalerweiser bei der Einführung unterschiedlicher Technologien verbunden sind (Verschraubung, Verklebung) die normalerweise sehr lange Einrichtzeiten erfordern. In particular, it can be stated that the described Process based on a technology that analogous to that already for the formation of each other technology used to connect cores. To that extent the process avoids uncertainties and inefficiencies, the usually when introducing different Technologies are connected (screw connection, Bonding) which is usually a very long set-up time require.

Darüber hinaus verwendet das beschriebene Verfahren nicht den Effekt der keilförmigen Verbindung, wie bei dem eingangs erwähnten US-Patent, sondern den Effekt der Verschweißung zwischen homogenen Materialien, das den Zusammenhalt des Paketes letztlich auf andere Weise effektiv bewirkt.It also uses the method described not the effect of the wedge-shaped connection, as with the US patent mentioned above, but the effect the welding between homogeneous materials, the ultimately the cohesion of the package in a different way effectively effects.

Anders als das Verfahren der Verkeilung mit Hilfe axialer Verbindungskerne, in denen die Auswahl der Unterteilungen, der Dimensionen und der Position des Keils oder der Keile erheblich begrenzt wird von Erfordernissen aufgrund der konstruktiven und funktionalen Eigenschaften der zu verbindenden Kerne (z.B. Vorhandensein von Klebekanälen), erlaubt letztlich das beschriebene Verfahren die Verbindungsoberflächen zwischen den Kernen mit großer Gestaltungsfreiheit auszuwählen. Auf diese Weise ist es möglich, die Schweißfläche mittels einer geeigneten Gestaltung der Kanäle zu maximieren, deren Form und Dimension in einfacher Weise in Abhängigkeit der spezifischen Form der zu verbindenden Kerne optimiert werden können.Unlike the method of wedging using axial Connecting cores in which the selection of subdivisions, the dimensions and position of the wedge or the wedges are significantly limited by requirements due to the constructive and functional Properties of the cores to be connected (e.g. existence of adhesive channels), ultimately allows the described Process the connection surfaces between to choose the cores with great freedom of design. In this way it is possible to weld the surface by means of a suitable design of the channels to maximize their shape and dimension in simpler Way depending on the specific form of the to be connected Cores can be optimized.

Claims (1)

Verfahren zum Verbinden von zwei oder mehreren Gießkernen, durch das einzelne, zuvor geformte Kerne (11) mittels einer Injektion einer Mischung aus Sand und Bindemittel in Kanäle (13), die zuvor auf mindestens einer der Kontaktoberflächen (12) zwischen den Kernen (11) vorgesehen werden, untereinander verschweißt werden, bestehend aus folgenden Schritten: Vorsehen von geeigneten Kanälen (13) auf mindestens einer der sich gegenüberliegenden Oberflächen (12) der Kerne (11) während der Kernbildung, Zusammenstellen der einzelnen Kerne (11) in Einrichtungen, die die korrekte gegenseitige Positionierung gewährleisten, Blockade des auf diese Weise erhaltenen Paketes (14) mittels einer Einrichtung, die geeignet ist, eine adäquate Gegenkraft zu den während der Schußphasen und während der Gaszufuhr zu der Schweißmischung erzeugten Kräfte zu sichern, und Injektion der Schweißmischung in das Innere der vorgeformten Kanäle (13) mittels Verwendung einer Kernschießmaschine, die geeigneterweise mit einer Schußplatte und einer Haube zur Gaszufuhr ausgestattet ist, um das Erreichen der Injektionspunkte zu garantieren. Method for connecting two or more casting cores, through which individual, previously shaped cores (11) by means of an injection of a mixture of sand and binding agent into channels (13), which previously had on at least one of the contact surfaces (12) between the cores (11) be provided, welded together, consisting of the following steps: Providing suitable channels (13) on at least one of the opposing surfaces (12) of the cores (11) during the core formation, Assembling the individual cores (11) in devices that ensure correct mutual positioning, Blocking the package (14) thus obtained by means of a device capable of ensuring an adequate counterforce to the forces generated during the shooting phases and during the gas supply to the welding mixture, and Injecting the sweat mixture into the interior of the preformed channels (13) using a core shooter suitably equipped with a firing plate and a gas supply hood to ensure that the injection points are reached.
EP98109522A 1997-05-27 1998-05-26 Method for connection foundry cores Expired - Lifetime EP0881013B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI971238 1997-05-27
IT97MI001238A IT1292008B1 (en) 1997-05-27 1997-05-27 FOUNDRY SOULS UNION METHOD

Publications (2)

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EP0881013A1 true EP0881013A1 (en) 1998-12-02
EP0881013B1 EP0881013B1 (en) 2001-05-30

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EP98109522A Expired - Lifetime EP0881013B1 (en) 1997-05-27 1998-05-26 Method for connection foundry cores

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DE (1) DE59800778D1 (en)
ES (1) ES2159414T3 (en)
IT (1) IT1292008B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000013819A1 (en) * 1998-09-03 2000-03-16 Foundry Automation S.A.S. Composite cores for foundry casting
WO2002051567A2 (en) * 2000-12-22 2002-07-04 International Engine Intellectual Property Company, Llc. Core assembly method for cylinder head castings

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932459A (en) * 1987-10-22 1990-06-12 Erana Augustin A Formation of foundry core blocks
EP0796682A1 (en) * 1996-02-23 1997-09-24 Sintokogio, Ltd. Cores and method for connecting cores by charging connecting sand into them

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932459A (en) * 1987-10-22 1990-06-12 Erana Augustin A Formation of foundry core blocks
US4932459B1 (en) * 1987-10-22 1996-05-14 Augustin A Erana Formation of foundry core blocks
EP0796682A1 (en) * 1996-02-23 1997-09-24 Sintokogio, Ltd. Cores and method for connecting cores by charging connecting sand into them

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000013819A1 (en) * 1998-09-03 2000-03-16 Foundry Automation S.A.S. Composite cores for foundry casting
WO2002051567A2 (en) * 2000-12-22 2002-07-04 International Engine Intellectual Property Company, Llc. Core assembly method for cylinder head castings
WO2002051567A3 (en) * 2000-12-22 2003-08-21 Int Engine Intellectual Prop Core assembly method for cylinder head castings

Also Published As

Publication number Publication date
ITMI971238A1 (en) 1998-11-27
ITMI971238A0 (en) 1997-05-27
DE59800778D1 (en) 2001-07-05
IT1292008B1 (en) 1999-01-25
ES2159414T3 (en) 2001-10-01
EP0881013B1 (en) 2001-05-30

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