WO2009149567A1 - Lost core having a reinforcing element for the removal thereof - Google Patents

Lost core having a reinforcing element for the removal thereof Download PDF

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Publication number
WO2009149567A1
WO2009149567A1 PCT/CH2009/000097 CH2009000097W WO2009149567A1 WO 2009149567 A1 WO2009149567 A1 WO 2009149567A1 CH 2009000097 W CH2009000097 W CH 2009000097W WO 2009149567 A1 WO2009149567 A1 WO 2009149567A1
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WO
WIPO (PCT)
Prior art keywords
core
reinforcing element
lost
casting
cores
Prior art date
Application number
PCT/CH2009/000097
Other languages
German (de)
French (fr)
Inventor
Bernhard Fritsche
Sascha Padovan
Benjamin Hübsch
Original Assignee
Bühler Druckguss AG
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
Priority claimed from DE102008002376A external-priority patent/DE102008002376A1/en
Application filed by Bühler Druckguss AG filed Critical Bühler Druckguss AG
Publication of WO2009149567A1 publication Critical patent/WO2009149567A1/en

Links

Classifications

    • 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
    • B22C9/106—Vented or reinforced cores
    • 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
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores

Definitions

  • the invention relates to a lost core, in particular for die casting molds and its use in die casting.
  • sliders also reduces productivity because additional movements of the slider must be completed before the casting can be ejected from the mold.
  • Certain components such as Pump housings, tubular bodies and other geometries with pronounced or complex cavities must be manufactured in shell construction.
  • two or more components (shells) of the component are poured, which are then joined together by various joining methods such as gluing, pressing, riveting or welding to the finished component.
  • the molded steels from which permanent molds are made are subject to wear due to temperature changes, cavitation, erosion and corrosion. These wear parts must be replaced at great cost from time to time.
  • cooling and heating channels temperature control channels
  • a medium circulates This is to ensure that, on the one hand, the melt in the gate area remains in the liquid phase as long as possible in order to be able to effectively feed the casting by high pressure in a holding pressure phase.
  • certain parts of the casting should solidify at different speeds as quickly as possible, in order to completely avoid solidification pockets or at least to shift them to areas where they can not adversely affect the function of the casting.
  • lost cores have also been made by using inserts or by casting / sheathing / wrapping these inserts.
  • the insert serves to support the lost core and / or to fix it as a core storage around the lost core in the mold.
  • lost cores such as salt cores to reduce the aforementioned disadvantages.
  • such cores are produced by mixing a granular salt with a phosphate-containing binder and subsequent shaping in a mold.
  • EP-A-1293276 the core is connected to an insert and in USP 5165464 it is disclosed to overmould a metal core with a salt mantle.
  • the invention is based on the object of providing a lost core, in particular for die-casting molds with an extended field of use, and which is also easily removable.
  • the object is solved with the features of claim 1.
  • the lost core is provided with a "reinforcement", which can be pulled out of the core after the casting process and which is also suitable at the same time locally affecting mechanical properties of the core.
  • the core can be mechanically pre-damaged and core removal is thereby at least simplified.
  • the core may be a normal sand or salt core o. The like. And its application is not limited to die casting.
  • Wires or a wire mesh consisting of resistance conductors are introduced into the core.
  • heating wires are introduced into the core.
  • lost cores with inserted heating wires can be used as a "heat treatment device”.
  • the reinforcing wires mechanically damage the core and a heat treatment can be performed with the heat of the cores. It can locally different wall thicknesses and thus the mech. Properties are targeted locally.
  • the heating wires can also be used to achieve the necessary decomposition temperatures in the core.
  • the reinforcement can be inserted (inserted, inserted) in the form of flexible wire nets, wire nets and / or plastic nets, plastic braids, pins or other devices in lost cores.
  • the core can collapse (by means of vibration or introduction of impulses or by leaching (chemically and or physically) the core material) inwards (into the cavity created by pulling out the reinforcement). This makes it easier to remove cores from lost cores, especially in diecasting. For example, this has hitherto not always been possible with media-carrying cavities / channels with a small cross-section
  • the invention will be described below with reference to a drawing.
  • the drawing shows a core according to the invention for imaging a cavity.
  • the core 1 comprises the core material 2 and a wire mesh 3 with a pull tab 4, which protrudes from the core material.
  • the core 1 is inserted into a pressure casting mold, not shown, and after solidification of the casting, the wire mesh 3 can be pulled out of the core 1 by machine or manually. Subsequently, the core space is rinsed to completely wash out the core material 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention relates to a lost core, in particular for die-casting dies, e.g. salt cores or sand cores, wherein the core comprises a core material (2) in which a reinforcing element is embedded.

Description

VERLORENER KERN MIT ARMIERUNGSELEMENT ZU DESSEN ENTFERNUNG LOST CORE WITH ARMING ELEMENT AT THEIR DISTANCE
Die Erfindung betrifft einen verlorenen Kern, insbesondere für Druckgiessformen und dessen Verwendung beim Druckgiessen.The invention relates to a lost core, in particular for die casting molds and its use in die casting.
Im Druckguss werden Dauerformen aus Stahl verwendet, um Schmelze von meist niedrig schmelzenden Legierungen in den Formholraum, der durch die Dauerform abgebildet wird, einzuspritzen. Dieser Formhohlraum bildet somit die dreidimensionale Geometrie des zu giessenden Bauteiles ab. Hierbei können Bauteilhohlräume und Hinterschnitte nur zum Teil und / oder mit Hilfe von Schiebern verwirklicht werden.In die casting, permanent molds made of steel are used to inject melt of mostly low-melting alloys into the mold cavity, which is imaged by the permanent mold. This mold cavity thus forms the three-dimensional geometry of the component to be cast. In this case, component cavities and undercuts can be realized only partially and / or with the aid of slides.
Der Einsatz von Schiebern vermindert zudem die Produktivität da zusätzliche Fahrbewegungen der Schieber erst beendet werden müssen, bevor das Gussteil aus der Form ausgestossen werden kann.The use of sliders also reduces productivity because additional movements of the slider must be completed before the casting can be ejected from the mold.
Mittels eines Schiebers können lediglich konzentrische Querschnitte in Kanälen oder Hohlräumen dargestellt werden. Um Schieber sicher ziehen zu können, müssen Kernpartien eine Ausformschräge aufweisen, so dass zylindrische oder parallele Kanäle noch eine, sich anschliessende mechanische Bearbeitung (z. B. durch Bohren oder Fräsen) erfordern.By means of a slider only concentric cross sections in channels or cavities can be displayed. In order to be able to pull slides reliably, core parts must have a shaping bevel, so that cylindrical or parallel channels still require a subsequent mechanical processing (eg by drilling or milling).
Gewisse Bauteile, wie z.B. Pumpengehäuse, Rohrkörper und andere Geometrien mit stark ausgeprägten oder komplexen Hohlräumen, müssen in Schalenbauweise hergestellt werden. Hierbei werden zwei oder mehrere Komponenten (Schalen) des Bauteiles gegossen, die dann durch verschiedene Fügeverfahren wie Kleben, Pressen, Nieten oder Schweissen zu dem fertigen Bauteil zusammengefügt werden.Certain components, such as Pump housings, tubular bodies and other geometries with pronounced or complex cavities must be manufactured in shell construction. Here, two or more components (shells) of the component are poured, which are then joined together by various joining methods such as gluing, pressing, riveting or welding to the finished component.
Zudem sind die Formstähle, aus denen Dauerformen hergestellt werden, einem Ver- schleiss durch Temperaturwechsel, Kavitation, Erosion und Korrosion ausgesetzt, Diese Verschleissteile müssen von Zeit zu Zeit kostenintensiv ersetzt werden. Um die Temperatur über die Wärmeabfuhr von Schmelzen in Dauerformen aus Stahl zu kontrollieren, werden in die Form Kühl- und Heizkanäle (Temperierkanäle) eingebracht, durch die ein Medium zirkuliert. Hiermit soll erreicht werden, dass einerseits die Schmelze im Anschnittbereich so lange wie möglich in der flüssigen Phase bleibt um effektiv durch hohen Druck in einer Nachdruckphase das Gussteil nachspeisen zu können. Andererseits sollen, je nach Bedarf, gewisse Partien am Gussteil unterschiedlich schnell erstarren um Erstarrungslunker ganz zu vermeiden oder diese zumindest in Bereiche zu verlagern, in denen sie die Funktion des Gussteiles nicht negativ beeinflussen können.In addition, the molded steels from which permanent molds are made are subject to wear due to temperature changes, cavitation, erosion and corrosion. These wear parts must be replaced at great cost from time to time. In order to control the temperature via the heat dissipation of melts in permanent molds made of steel, cooling and heating channels (temperature control channels) are introduced into the mold, through which a medium circulates. This is to ensure that, on the one hand, the melt in the gate area remains in the liquid phase as long as possible in order to be able to effectively feed the casting by high pressure in a holding pressure phase. On the other hand, certain parts of the casting should solidify at different speeds as quickly as possible, in order to completely avoid solidification pockets or at least to shift them to areas where they can not adversely affect the function of the casting.
Durch die relativ langsame Wärmeleitung durch den Stahl zu den Temperierkanälen hin ist dieses System allerdings zu träge, was eine effektive Beeinflussung der Wärmeableitung erschwert.However, due to the relatively slow heat conduction through the steel to the tempering channels, this system is too sluggish, which makes effective control of the heat dissipation more difficult.
Seit längerem werden verlorene Kerne auch durch die Verwendung von Einlagen oder durch Umgiessen/Umschiessen/Umhüllen dieser Einlagen hergestellt. Hierbei dient die Einlage dazu, den verlorenen Kern zu stützen und/oder als Kernlager um den verlorenen Kern in der Giessform zu fixieren.For a long time, lost cores have also been made by using inserts or by casting / sheathing / wrapping these inserts. Here, the insert serves to support the lost core and / or to fix it as a core storage around the lost core in the mold.
Bekannt sind weiterhin verlorene Kerne, wie zum Beispiel Salzkerne um die vorgenannten Nachteile zu verringern. Gemäss DE-A-102004006600 werden derartige Kerne durch mischen eines körnigen Salzes mit einem phosphathaltigen Binder und nachfolgende Formgebung in einem Formwerkzeug hergestellt. Nach EP-A-1293276 ist der Kern mit einem Einlegeteil verbunden und in der USP 5165464 ist offenbart, einen metallischen Kern mit einem Salzmantel zu umgiessen.Also known are lost cores, such as salt cores to reduce the aforementioned disadvantages. According to DE-A-102004006600, such cores are produced by mixing a granular salt with a phosphate-containing binder and subsequent shaping in a mold. According to EP-A-1293276 the core is connected to an insert and in USP 5165464 it is disclosed to overmould a metal core with a salt mantle.
Der Erfindung liegt nun die Aufgabe zugrunde, einen verlorenen Kern, insbesondere für Druckgiessformen mit erweitertem Einsatzbereich zu schaffen und der auch einfach entfernbar ist. Die Aufgabe ist mit den Merkmalen des Patentanspruchs 1 gelöst.The invention is based on the object of providing a lost core, in particular for die-casting molds with an extended field of use, and which is also easily removable. The object is solved with the features of claim 1.
Erfindungsgemäss ist der verlorene Kern mit einer „Armierung" versehen, die nach dem Giessvorgang aus dem Kern gezogen werden kann und die zugleich geeignet ist, die mechanischen Eigenschaften des Kernes örtlich zu beeinflussen. Der Kern kann mechanisch vorgeschädigt werden und das entkernen wird dadurch zumindest vereinfacht. Der Kern kann ein normaler Sand- oder Salzkern o. dgl. sein und dessen Anwendung ist nicht auf das Druckgiessen begrenzt.According to the invention, the lost core is provided with a "reinforcement", which can be pulled out of the core after the casting process and which is also suitable at the same time locally affecting mechanical properties of the core. The core can be mechanically pre-damaged and core removal is thereby at least simplified. The core may be a normal sand or salt core o. The like. And its application is not limited to die casting.
Drähte oder ein Drahtgeflecht, die aus Widerstandsleitern (Heizdrähten) bestehen, werden in den Kern eingebracht. Somit werden verlorene Kerne mit eingelegten Heizdrähten als „Wärmehandlungseinrichtung" nutzbar.Wires or a wire mesh consisting of resistance conductors (heating wires) are introduced into the core. Thus lost cores with inserted heating wires can be used as a "heat treatment device".
Die Armierungsdrähte schädigen den Kern mechanisch vor und eine Wärmebehandlung kann mit der Hitze der Kerne durchgeführt werden. Es können örtlich unterschiedliche Wandstärken und damit die einzustellenden mech. Eigenschaften gezielter örtlich beeinflusst werden.The reinforcing wires mechanically damage the core and a heat treatment can be performed with the heat of the cores. It can locally different wall thicknesses and thus the mech. Properties are targeted locally.
Mit den Heizdrähten können zudem im Kern die notwendigen Zerfallstemperaturen erreicht werden.The heating wires can also be used to achieve the necessary decomposition temperatures in the core.
Bevorzugte Ausführungsformen sind in den Unteransprüchen offenbart.Preferred embodiments are disclosed in the subclaims.
Die Armierung kann in Form von flexiblen Drahtnetzen, Drahtgeflechten und/oder Kunststoff netzen, Kunststoffgeflechten, Stiften oder anderen Einrichtungen in verlorene Kerne eingelegt (eingefügt, eingebracht) sein.The reinforcement can be inserted (inserted, inserted) in the form of flexible wire nets, wire nets and / or plastic nets, plastic braids, pins or other devices in lost cores.
Derartige Armierungen sind zwar grundsätzlich bekannt, z. B. im Bauwesen, doch soll in jedem Fall die Festigkeit des jeweiligen Bauteiles erhöht werden, eine Entfernung der Armierung oder gar eine Zerstörung des armierten Bauteiles ist dabei weder vorgesehen noch erwünscht, so dass dieser Stand der Technik auch keinerlei Anregungen für die erfindungsgemässe Lösung liefern kann.Although such reinforcements are known in principle, for. As in construction, but in any case, the strength of the respective component to be increased, a removal of the reinforcement or even a destruction of the armored component is neither provided nor desired, so that this prior art also provide any suggestions for the inventive solution can.
Durch die beim Druckguss vorherrschenden Bedingungen - hohe Drücke und hohe Fliessgeschwindigkeiten der Schmelze - müssen verlorene Kerne besonders robust sein. Dies erschwert nach dem Giessen die Entfernung eben dieser Kerne. Durch das Einlegen eines oder mehrerer Drahtnetze/Drahtgeflechte und/oder Kunststoffnetze/Kunststoffgeflechte, Stiften o. dgl. in einen verlorenen Kern kann durch das mechanische Ziehen eben dieser durch mechanische Zerstörung des Kernes erreicht werden, dassDue to the prevailing conditions in die casting - high pressures and high flow velocities of the melt - lost cores must be particularly robust. This complicates the removal of these cores after casting. By inserting one or more wire nets / wire mesh and / or plastic nets / plastic braids, pins o. The like. In a lost core can be achieved by the mechanical pulling just this by mechanical destruction of the core, that
> durch die so entstehenden Hohlräume in Druckgussteilen kann der Kern (mittels Vibration oder Einbringen von Impulsen oder durch Herauslösen (chemisch und oder physikalisch) des Kernmaterials) nach innen (in den Hohlraum, der durch das Herausziehen der Armierung entsteht) kollabieren. So wird eine leichtere Entkern- barkeit von verlorenen Kernen, insbesondere im Druckguss erreicht. Dies ist zum Beispiel bei medienführenden Hohlräumen/Kanälen mit geringem Querschnitt bis anhin nicht immer möglich gewesen> Through the resulting voids in die-cast parts, the core can collapse (by means of vibration or introduction of impulses or by leaching (chemically and or physically) the core material) inwards (into the cavity created by pulling out the reinforcement). This makes it easier to remove cores from lost cores, especially in diecasting. For example, this has hitherto not always been possible with media-carrying cavities / channels with a small cross-section
> bei Druckgussteilen, bei denen bestimmungsgemäss nicht eine restlose Entfernung des verlorenen Kernes notwendig ist, kann so eine ausreichende Entkernung durch mechanische Zerstörung des Kernes und anschliessendes Ausleeren der Kernreste erreicht werden.> In the case of die-cast parts which do not require complete removal of the lost core as intended, adequate gutting can be achieved by mechanical destruction of the core and subsequent emptying of the core remnants.
Die Erfindung wird nachfolgend anhand einer Zeichnung näher beschrieben. Die Zeichnung zeigt einen erfindungsgemässen Kern zur Abbildung eines Hohlraumes.The invention will be described below with reference to a drawing. The drawing shows a core according to the invention for imaging a cavity.
Der Kern 1 umfasst das Kernmaterial 2 und ein Drahtgeflecht 3 mit einer Zuglasche 4, die aus dem Kernmaterial herausragt. Der Kern 1 wird in eine nicht dargestellte Druck- giessform eingesetzt und nach Erstarrung des Gussteiles kann das Drahtgeflecht 3 maschinell oder manuell aus dem Kern 1 gezogen werden. Anschliessend wird der Kernraum gespült um das Kernmaterial 2 vollständig auszuwaschen. The core 1 comprises the core material 2 and a wire mesh 3 with a pull tab 4, which protrudes from the core material. The core 1 is inserted into a pressure casting mold, not shown, and after solidification of the casting, the wire mesh 3 can be pulled out of the core 1 by machine or manually. Subsequently, the core space is rinsed to completely wash out the core material 2.

Claims

Patentansprüche claims
1. Verlorener Kern, insbesondre für Druckgiessformen, ein Salzkern oder Sandkern oder dergleichen, dadurch gekennzeichnet, dass er ein Kernmaterial (2) umfasst, in das ein Armierungselement eingebettet ist.Lost core, in particular for diecasting, a salt core or sand core or the like, characterized in that it comprises a core material (2), in which a reinforcing element is embedded.
2. Verlorener Kern nach Anspruch 1 , dadurch gekennzeichnet, dass das Armierungselement ein flexibles Drahtnetz/Drahtgeflecht und/oder Kunststoffnetz/Kunststoffgeflecht, Stift(e) o. dgl. umfasst.2. Lost core according to claim 1, characterized in that the reinforcing element comprises a flexible wire mesh / wire mesh and / or plastic mesh / plastic mesh, pin (s) o. The like.
3. Verlorener Kern nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Armierungselement ein Widerstandsleiter ist.3. Lost core according to claim 1 or 2, characterized in that the reinforcing element is a resistance conductor.
4. Verwendung eines Kerns nach einem der Ansprüche 1 bis 3 zur Abbildung mindestens eines Hohlraumes, eines Hinterschnittes oder eines Gewindes in einem Gussteil.4. Use of a core according to one of claims 1 to 3 for imaging at least one cavity, an undercut or a thread in a casting.
5. Verwendung eines Kerns mit einem Armierungselement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass beim entfernen des Armierungselementes der Kern (1 ) beschädigt oder zerstört wird um ein entkernen zu ermöglichen.5. Use of a core with a reinforcing element according to one of claims 1 to 3, characterized in that when removing the reinforcing element of the core (1) is damaged or destroyed to allow cores to core.
6. Verfahren zur Entfernung eines verlorenen Kernes aus einem Gussteil, insbesondere beim Druckgiessen in metallischen Formen, in deren Formhohlraum mindestens ein verlorener Kern angeordnet wird, dadurch gekennzeichnet, dass in einem Kernmaterial (2) des Kernes (1 ) ein Armierungselement angeordnet wird, das nach der Erstarrung des Gussteiles aus dem Kern (1 ) gezogen wird und erst danach das Kernmaterial (2) entfernt wird. 6. A method for removing a lost core from a casting, in particular during die casting in metallic molds, in the mold cavity at least one lost core is arranged, characterized in that in a core material (2) of the core (1) a reinforcing element is arranged, the after solidification of the casting is pulled out of the core (1) and only then the core material (2) is removed.
PCT/CH2009/000097 2008-06-12 2009-03-18 Lost core having a reinforcing element for the removal thereof WO2009149567A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008002376A DE102008002376A1 (en) 2008-02-22 2008-06-12 Disposable core such as salt core or sand core for die casting molds, comprises a core material, in which a reinforcing element is embedded
DE102008002376.0 2008-06-12

Publications (1)

Publication Number Publication Date
WO2009149567A1 true WO2009149567A1 (en) 2009-12-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101987347A (en) * 2010-09-29 2011-03-23 西安交通大学 Manufacturing method of core for casting engine exhaust manifold

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5597844A (en) * 1979-01-17 1980-07-25 Honda Motor Co Ltd Forming method of cast-out hole
DE3144958A1 (en) * 1981-11-12 1983-05-19 Honsel-Werke Ag, 5778 Meschede Core for the production of narrow channels in castings
JPS63256262A (en) * 1987-04-13 1988-10-24 Toyota Motor Corp Method for removing core sand of casting
FR2707901A1 (en) * 1993-07-23 1995-01-27 Peugeot Method for disintegrating a moulding-sand core
US20050247428A1 (en) * 2004-04-20 2005-11-10 Tenedora Nemak, S.A. De C.V. Method and apparatus for casting aluminum engine blocks with cooling liquid passage in ultra thin interliner webs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5597844A (en) * 1979-01-17 1980-07-25 Honda Motor Co Ltd Forming method of cast-out hole
DE3144958A1 (en) * 1981-11-12 1983-05-19 Honsel-Werke Ag, 5778 Meschede Core for the production of narrow channels in castings
JPS63256262A (en) * 1987-04-13 1988-10-24 Toyota Motor Corp Method for removing core sand of casting
FR2707901A1 (en) * 1993-07-23 1995-01-27 Peugeot Method for disintegrating a moulding-sand core
US20050247428A1 (en) * 2004-04-20 2005-11-10 Tenedora Nemak, S.A. De C.V. Method and apparatus for casting aluminum engine blocks with cooling liquid passage in ultra thin interliner webs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101987347A (en) * 2010-09-29 2011-03-23 西安交通大学 Manufacturing method of core for casting engine exhaust manifold
CN101987347B (en) * 2010-09-29 2012-07-25 西安交通大学 Manufacturing method of core for casting engine exhaust manifold

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