EP0067413B1 - Device for producing moulds - Google Patents

Device for producing moulds Download PDF

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Publication number
EP0067413B1
EP0067413B1 EP82105047A EP82105047A EP0067413B1 EP 0067413 B1 EP0067413 B1 EP 0067413B1 EP 82105047 A EP82105047 A EP 82105047A EP 82105047 A EP82105047 A EP 82105047A EP 0067413 B1 EP0067413 B1 EP 0067413B1
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EP
European Patent Office
Prior art keywords
vacuum
mould box
screen surface
backfill material
mould
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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.)
Expired
Application number
EP82105047A
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German (de)
French (fr)
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EP0067413A1 (en
Inventor
Herbert Grolla
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.)
Heinrich Wagner Sinto Maschinenfabrik GmbH
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Heinrich Wagner Sinto Maschinenfabrik GmbH
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Application filed by Heinrich Wagner Sinto Maschinenfabrik GmbH filed Critical Heinrich Wagner Sinto Maschinenfabrik GmbH
Priority to AT82105047T priority Critical patent/ATE10813T1/en
Publication of EP0067413A1 publication Critical patent/EP0067413A1/en
Application granted granted Critical
Publication of EP0067413B1 publication Critical patent/EP0067413B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding

Definitions

  • the invention relates to a device for the vacuum molding process for the production of casting molds from binder-free refractory backfill, which is enclosed between foils and solidified by the negative pressure generated inside the backfill, with a molding box which has a vacuum collecting channel in at least one wall, and at least one in the the vacuum cavity arranged in the mold cavity of the mold box, which is connected to the vacuum collecting duct and has evacuation openings distributed over its circumference.
  • a device of this type is e.g. B. from DE-C3-2 248 968 known.
  • the molding box consists of a frame-shaped structure, in one side wall of which a vacuum collecting duct is arranged with a connection for connection to a vacuum source, e.g. B. a vacuum pump.
  • a vacuum source e.g. B. a vacuum pump.
  • vacuum manifold vacuum lines are firmly connected on one side, which extend through the space receiving the backfill. On their circumference, these vacuum lines have a large number of openings through which the air contained in the backfill can be evacuated. However, these openings are so small that the granular backfill cannot penetrate into the vacuum lines.
  • the invention has for its object to provide a device of the type mentioned in such a way that even if the vacuum lines are damaged, penetration of the backfill and liquid material into the vacuum system of the device is prevented, thus preventing possible damage to the device, the vacuum system and accidents and that the vacuum lines contained in the device can be easily replaced or their arrangement can be changed.
  • the vacuum channel is opened through a screen surface to the mold cavity and that the vacuum line is also provided on at least one end face with a screen surface and is inserted into the mold box in such a way that its screen surface of the screen surface of the mold box in one entry from the backfill permitting distance.
  • a device thus has vacuum lines embedded in the backfill, which have no mechanical connection to the side walls of the device.
  • the vacuum lines themselves are closed on all sides and have sieve surfaces on both their end faces and on their peripheral surfaces, through which the air contained in the backfill can be sucked in.
  • These vacuum lines are placed loosely in the backfill, the screen surfaces of the vacuum lines lying opposite the screen surfaces in the walls of the molding box. Since the vacuum lines are shorter than the distance between opposite screen surfaces, there remains a distance between the screen surfaces of the device and the screen surfaces of the vacuum lines, which is filled with backfill material.
  • the Vacuum lines lying in the backfill are thus coupled to the vacuum system of the device with the interposition of a defined layer of backfill.
  • any vacuum line is damaged, it can simply be removed from the device because there are no mechanical connections.
  • Another advantage is that due to the loose arrangement of the vacuum lines in the device, these can be laid at the most convenient locations in foundry technology. On the other hand, this means that a device according to the invention is suitable for different casting molds.
  • the vacuum lines can be installed in the device without any fastening. However, it is advantageous to place the vacuum lines on supports arranged on the side walls having the screen surfaces, which advantageously have spacer elements, with the aid of which the distance of the end faces of the vacuum lines from the screen surfaces is determined.
  • the vacuum lines are advantageously held on the supports with the aid of quick attachments in the form of resilient tabs.
  • the ends of the vacuum lines are expanded in a trumpet shape, so that the cross section of the front screen surface is larger than the cross section of the other vacuum line.
  • the device 1 according to the invention shown in FIGS. 1 and 2 consists of a rectangular molding box 2, which is open on its lower and upper side, in the side walls of which a circumferential vacuum collecting duct 3 is arranged. To the interior of the device 1, this vacuum collecting duct is opened on two opposite sides 5, 6 via a sieve surface 4. A plurality of supports 7 are attached to the screen surfaces 4 and serve to receive a vacuum line 8. The length of this vacuum line 8 is slightly less than the distance between the two opposite sieve surfaces 4. This means that between each sieve surface 4 and the end face 9 of the vacuum line 8, an intermediate space is formed, which is filled with backfill when filling the backfill 10 into the device 9 is.
  • the supports 7 are of stepped design and form a stop 11 for the vacuum line 8, so that the latter is fixed at a distance from the sieve surfaces 4.
  • a resilient tab 12 which extends over the end of the vacuum line 8 and presses it against the support 7.
  • the vacuum line 8 which has evacuation openings on its entire circumferential surface, is trumpet-shaped at both ends, so that the screen surfaces 13 formed on its end faces have a larger cross section than the cross section of the other vacuum line 8. This results in a better coupling of the vacuum line 8 given the vacuum manifold 3 in the device 1.
  • This vacuum manifold 3 is provided with a connection 14 through which the vacuum channel to a vacuum source, for. B. a vacuum pump can be connected.
  • the device 1 according to the invention is placed on a model plate 16 which carries a model 15.
  • the model plate 16 is in turn provided with a vacuum channel 17, which can be connected via a connection 18 to a vacuum source, not shown.
  • the vacuum channel 17 is connected via holes 19 to the top of the model plate, so that the film 20 placed on the model plate is sucked onto the model plate and the model.
  • 8 backfill agent is then poured in via the still free upper side of the device 1 and, if necessary, pre-compressed by means of a vibrator.
  • a cover film 21 is then placed on the device 1 and the interior of the device is evacuated via the vacuum collecting duct 3 and the evacuation lines 8.
  • the vacuum line 8 is coupled to the vacuum collecting duct 3 via a thin layer of backfill material located between the two screen surfaces 4 and 13 of the device or the vacuum line 8.
  • the thickness of this Backfill mass layer is determined by the distance between the two screen surfaces 4 and by the length of the vacuum line 8.
  • the negative pressure in the negative pressure line 17 of the model plate 16 is released, so that the device 1 can now be lifted off the model plate 16.
  • the other mold half is produced in the same way and the casting takes place after the two mold halves have been assembled into a mold.
  • Damaged vacuum lines 8 are very easy to replace in a device according to the invention, since, if mechanical holders are provided in the device at all, they are only held by simple clamping devices. The vacuum lines can be replaced in just a few simple steps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

1. Apparatus for the vacuum-forming process for producing casting moulds from refractory backfill material free of binding agent, which is contained between sheets and which is consolidated by vacuum created inside the backfill material, with a mould box (2) which in at least one wall (5, 6) has a vacuum manifold (3) and at least one vacuum duct (8) which is arranged in the mould cavity of the mould box receiving the backfill material (10), which is operatively connected to the vacuum manifold (3) and has evacuation openings spaced apart on its periphery, characterised in that through a screen surface (4) the vacuum manifold (3) is open towards the mould cavity, and in that at at least one end face (9) the vacuum duct (8) is likewise provided with a screen surface (13) and is so disposed in the mould box (2) that its screen surface (13) lies opposite the screen surface (4) of the mould box (2) at a distance which allows the admission of backfill material.

Description

Die Erfindung betrifft eine Vorrichtung für das Vakuumformverfahren zur Herstellung von Gießformen aus bindemittelfreier feuerfester Hinterfüllmasse, die zwischen Folien eingeschlossen und durch im Inneren der Hinterfüllmasse erzeugten Unterdruck verfestigt ist, mit einem Formkasten, der in mindestens einer Wand einen Unterdrucksammelkanal aufweist, und mindestens einer in dem die Hinterfüllmasse aufnehmenden Formhohlraum des Formkastens angeordneten Unterdruckleitung, die an den Unterdrucksammelkanal angeschlossen ist und auf ihrem Umfang verteilte Evakuierungsöffnungen aufweist.The invention relates to a device for the vacuum molding process for the production of casting molds from binder-free refractory backfill, which is enclosed between foils and solidified by the negative pressure generated inside the backfill, with a molding box which has a vacuum collecting channel in at least one wall, and at least one in the the vacuum cavity arranged in the mold cavity of the mold box, which is connected to the vacuum collecting duct and has evacuation openings distributed over its circumference.

Eine Vorrichtung dieser Art ist z. B. aus der DE-C3-2 248 968 bekannt. Der Formkasten besteht aus einem rahmenförmigen Gebilde, in dessen einer Seitenwand ein Unterdrucksammelkanal angeordnet ist mit einem Anschluß für die Verbindung mit einer Unterdruckquelle, z. B. einer Vakuumpumpe. An diesen Unterdrucksammelkanal sind Unterdruckleitungen einseitig fest angeschlossen, die sich durch den die Hinterfüllmasse aufnehmenden Raum erstrecken. Auf ihrem Umfang weisen diese Unterdruckleitungen eine Vielzahl von Öffnungen auf, über die die in der Hinterfüllmasse enthaltene Luft evakuiert werden kann. Diese Öffnungen sind jedoch so klein, daß die körnige Hinterfüllmasse nicht in die Unterdruckleitungen eindringen kann.A device of this type is e.g. B. from DE-C3-2 248 968 known. The molding box consists of a frame-shaped structure, in one side wall of which a vacuum collecting duct is arranged with a connection for connection to a vacuum source, e.g. B. a vacuum pump. At this vacuum manifold vacuum lines are firmly connected on one side, which extend through the space receiving the backfill. On their circumference, these vacuum lines have a large number of openings through which the air contained in the backfill can be evacuated. However, these openings are so small that the granular backfill cannot penetrate into the vacuum lines.

Diese mit den Wandungen der Vorrichtungen fest verbundenen Unterdruckleitungen bilden somit mit der Vorrichtung ein starres Ganzes, so daß die Anordnung dieser Unterdruckleitungen dem jeweiligen Gußstück angepaßt sein müssen. Dies bedingt, daß in einer Vorrichtung nur ganz bestimmt geformte Gußstücke herstellbar sind, was eine nicht unbeträchtliche Lagerhaltung notwendig macht. Des weiteren hat es sich jedoch in der Praxis herausgestellt, daß die fest mit der Vorrichtung verbundenen Unterdruckleitungen bei der rauhen Betriebsart in den Gießereien häufig beschädigt werden. Dies bedeutet, daß die Siebflächen auf dem Umfang der Unterdruckleitungen beschädigt werden. Diese Beschädigungen haben zur Folge, daß Hinterfüllmasse aus der Gießform abgesaugt wird und über den Unterdrucksammelkanal in die Vakuumpumpe gelangen kann. Die Folge ist, daß nicht nur Beschädigungen im Unterdrucksystem auftreten können, sondern daß die Gießform infolge des mangelnden Unterdrucks in der Hinterfüllmasse ihre Form nicht beibehält, so daß das Gußstück außer Toleranz gerät. Falls die Beschädigungen an den Unterdruckleitungen nicht bemerkt werden, kann es sogar vorkommen, daß flüssiges Metall aus der Gießform abgesaugt wird, was nicht nur zur Beschädigung der Gießform, sondern auch zu schweren Unfällen führen kann. Auch wenn die Beschädigungen der Unterdruckleitungen festgestellt werden, so ist das Auswechseln derselben zeit- und kostenaufwendig.These vacuum lines firmly connected to the walls of the devices thus form a rigid whole with the device, so that the arrangement of these vacuum lines must be adapted to the respective casting. This means that only very definitely shaped castings can be produced in one device, which makes a not inconsiderable storage necessary. In addition, however, it has been found in practice that the vacuum lines fixedly connected to the device are frequently damaged in the rough operating mode in the foundries. This means that the screen surfaces on the circumference of the vacuum lines are damaged. This damage has the consequence that backfill is sucked out of the casting mold and can get into the vacuum pump via the vacuum collecting channel. The result is that not only can damage occur in the vacuum system, but that the casting mold does not maintain its shape due to the lack of vacuum in the backfill, so that the casting becomes out of tolerance. If the damage to the vacuum lines is not noticed, it can even happen that liquid metal is sucked out of the mold, which can lead not only to damage to the mold, but also to serious accidents. Even if the damage to the vacuum lines is found, replacing them is time-consuming and costly.

Aus DE-U-8 029 438 ist ein Formkasten für das Vakuumformverfahren bekannt, dessen Unterdruckleitungen mit gelochten Metallstreifen abgedeckt und dadurch vor der von der Metallschmelze ausgehenden und über die Hinterfüllmasse übertragenen Hitze besser geschützt sind und daher eine längere Lebensdauer haben. Ein Austausch ist daher weniger oft nötig und wird außerdem dadurch erleichtert, daß jede Unterdruckleitung an einem Ende in einen an der Formkastenwand vorgesehenen Schraubstutzen eingeschraubt und an ihrem anderen Ende in einem Rohrstutzen des Formkastens lose geführt ist. Nach wie vor besteht aber die Gefahr, daß bei einer Beschädigung der Unterdruckleitungen, insbesondere bei einem Durchschmoren des ihre Öffnungen abdeckenden Drahtgeflechts, Hinterfüllmasse in das Unterdrucksystem gesaugt werden kann. Außerdem ist die Anordnung der Unterdruckleitungen im Formkasten durch die fest montierten Schraub- und Rohrstutzen unveränderlich vorgegeben und kann nicht an Größe und Form des jeweiligen Gußstücks angepaßt werden.From DE-U-8 029 438 a molding box for the vacuum molding process is known, the vacuum lines of which are covered with perforated metal strips and are thus better protected from the heat emanating from the metal melt and transferred via the backfill and therefore have a longer service life. An exchange is therefore less often necessary and is also facilitated in that each vacuum line is screwed at one end into a screw socket provided on the wall of the molding box and loosely guided at its other end in a pipe socket of the molding box. However, there is still the risk that if the vacuum lines are damaged, in particular if the wire mesh covering their openings is burned through, the backfilling compound can be sucked into the vacuum system. In addition, the arrangement of the vacuum lines in the molding box is invariably predetermined by the firmly mounted screw and pipe socket and cannot be adapted to the size and shape of the respective casting.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art so auszubilden, daß auch bei Beschädigung der Unterdruckleitungen ein Eindringen von Hinterfüllmasse und flüssigem Material in das Unterdrucksystem der Vorrichtung verhindert ist und somit mögliche Beschädigungen der Vorrichtung, des Vakuumsystems wie auch Unfälle ausgeschlossen sind und daß die in der Vorrichtung enthaltenen Unterdruckleitungen leicht auswechselbar bzw. ihre Anordnung veränderbar ist.The invention has for its object to provide a device of the type mentioned in such a way that even if the vacuum lines are damaged, penetration of the backfill and liquid material into the vacuum system of the device is prevented, thus preventing possible damage to the device, the vacuum system and accidents and that the vacuum lines contained in the device can be easily replaced or their arrangement can be changed.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Unterdruckkanal durch eine Siebfläche zum Formhohlraum hin geöffnet ist und daß die Unterdruckleitung an mindestens einer Stirnseite ebenfalls mit einer Siebfläche versehen und derart in den Formkasten eingelegt ist, daß ihre Siebfläche der Siebfläche des Formkastens in einem den Eintritt von Hinterfüllmasse erlaubenden Abstand gegenübersteht.This object is achieved in that the vacuum channel is opened through a screen surface to the mold cavity and that the vacuum line is also provided on at least one end face with a screen surface and is inserted into the mold box in such a way that its screen surface of the screen surface of the mold box in one entry from the backfill permitting distance.

Eine erfindungsgemäße Vorrichtung hat somit in der Hinterfüllmasse eingebettete Unterdruckleitungen, die keine mechanische Verbindung zu den Seitenwänden der Vorrichtung aufweisen. Die Unterdruckleitungen selber sind allseitig geschlossen und weisen sowohl an ihren Stirnflächen als auch an ihren Umfangsflächen Siebflächen auf, über die die in der Hinterfüllmasse enthaltene Luft eingesogen werden kann. Diese Unterdruckleitungen werden lose in die Hinterfüllmasse eingelegt, wobei die Siebflächen der Unterdruckleitungen den Siebflächen in den Wänden des Formkastens gegenüberliegen. Da die Unterdruckleitungen kürzer sind als der Abstand gegenüberliegender Siebflächen, verbleibt zwischen den Siebflächen der Vorrichtung und den Siebflächen der Unterdruckleitungen ein Abstand, der mit Hinterfüllmasse ausgefüllt wird. Die in der Hinterfüllmasse liegenden Unterdruckleitungen werden somit unter Zwischenschaltung einer definierten Schicht von Hinterfüllmasse an das Unterdrucksystem der Vorrichtung angekoppelt.A device according to the invention thus has vacuum lines embedded in the backfill, which have no mechanical connection to the side walls of the device. The vacuum lines themselves are closed on all sides and have sieve surfaces on both their end faces and on their peripheral surfaces, through which the air contained in the backfill can be sucked in. These vacuum lines are placed loosely in the backfill, the screen surfaces of the vacuum lines lying opposite the screen surfaces in the walls of the molding box. Since the vacuum lines are shorter than the distance between opposite screen surfaces, there remains a distance between the screen surfaces of the device and the screen surfaces of the vacuum lines, which is filled with backfill material. The Vacuum lines lying in the backfill are thus coupled to the vacuum system of the device with the interposition of a defined layer of backfill.

Der Vorteil dieser Maßnahme besteht zum einen darin, daß auch bei Beschädigung der Unterdruckleitungen keine Hinterfüllmasse in das Unterdrucksystem der Vorrichtung eindringen kann. Das gleiche gilt für die flüssige Schmelze. Es kann somit schlimmstenfalls nur eintreten, daß eine beschädigte Unterdruckleitung durch die eindringende Hinterfüllmasse oder gegebenenfalls auch durch die Schmelze ausgefüllt wird und damit ihre Funktion verliert. Durch die lose Ankoppelung der Unterdruckleitung an das Unterdrucksystem der Vorrichtung ist in jedem Fall weitergehender Schaden verhindert.The advantage of this measure is, on the one hand, that even if the vacuum lines are damaged, no backfill can penetrate into the vacuum system of the device. The same applies to the liquid melt. In the worst case, it can only happen that a damaged vacuum line is filled by the penetrating backfill or, if necessary, also by the melt and thus loses its function. Loose coupling of the vacuum line to the vacuum system of the device prevents further damage in any case.

Sollte irgendeine Unterdruckleitung beschädigt sein, so kann diese, da keine mechanischen Anschlüsse vorhanden sind, einfach aus der Vorrichtung herausgenommen werden. Ein weiterer Vorteil besteht darin, daß durch die lose Anordnung der Unterdruckleitungen in der Vorrichtung diese an den aus gießereitechnisch zweckmäßigsten Stellen verlegt werden können. Dies bedeutet andererseits, daß eine erfindungsgemäße Vorrichtung für unterschiedliche Gießformen geeignet ist.If any vacuum line is damaged, it can simply be removed from the device because there are no mechanical connections. Another advantage is that due to the loose arrangement of the vacuum lines in the device, these can be laid at the most convenient locations in foundry technology. On the other hand, this means that a device according to the invention is suitable for different casting molds.

Die Unterdruckleitungen können ohne jegliche Befestigung in der Vorrichtung verlegt werden. Vorteilhaft ist es jedoch, die Unterdruckleitungen auf an den die Siebflächen aufweisenden Seitenwänden angeordneten Auflagern abzulegen, die vorteilhaft Abstandselemente aufweisen, mit deren Hilfe der Abstand der Stirnflächen der Unterdruckleitungen von den Siebflächen bestimmt ist. Vorteilhaft werden die Unterdruckleitungen auf den Auflagern mit Hilfe von Schnellbefestigungen in Form von federnden Laschen gehalten.The vacuum lines can be installed in the device without any fastening. However, it is advantageous to place the vacuum lines on supports arranged on the side walls having the screen surfaces, which advantageously have spacer elements, with the aid of which the distance of the end faces of the vacuum lines from the screen surfaces is determined. The vacuum lines are advantageously held on the supports with the aid of quick attachments in the form of resilient tabs.

Für eine optimale Ankoppelung der Unterdruckleitungen an die Unterdruckkanäle im Inneren der Seitenwände der Vorrichtung sind die Enden der Unterdruckleitungen trompetenförmig aufgeweitet, so daß der Querschnitt der stirnseitigen Siebfläche größer ist als der Querschnitt der sonstigen Unterdruckleitung.For an optimal coupling of the vacuum lines to the vacuum channels inside the side walls of the device, the ends of the vacuum lines are expanded in a trumpet shape, so that the cross section of the front screen surface is larger than the cross section of the other vacuum line.

Weitere vorteilhafte Ausgestaltungen der Erfindung gehen aus den Ansprüchen in Verbindung mit Beschreibung und Zeichnung hervor.Further advantageous embodiments of the invention emerge from the claims in conjunction with the description and drawing.

Ein Ausführungsbeispiel der Erfindung ist im folgenden anhand der Zeichnung näher beschrieben, in dieser zeigen :

  • Figur 1 einen Querschnitt durch eine erfindungsgemäße Vorrichtung, aufgesetzt auf ein Modell und
  • Figur 2 einen Längsschnitt durch die in Fig. 1 gezeigte Vorrichtung.
An embodiment of the invention is described in more detail below with reference to the drawing, in which:
  • 1 shows a cross section through a device according to the invention, placed on a model and
  • Figure 2 shows a longitudinal section through the device shown in Fig. 1.

Die in den Fig. 1 und 2 dargestellte erfindungsgemäße Vorrichtung 1 besteht aus einem rechteckigen, an seiner Unter- und Oberseite offenen Formkasten 2, in dessen Seitenwänden ein umlaufender Unterdrucksammelkanal 3 angeordnet ist. Zum Inneren der Vorrichtung 1 ist dieser Unterdrucksammelkanal an zwei gegenüberliegenden Seiten 5, 6 über eine Siebfläche 4 geöffnet. An den Siebflächen 4 sind mehrere Auflager 7 angebracht, die zur Aufnahme einer Unterdruckleitung 8 dienen. Die Länge dieser Unterdruckleitung 8 ist etwas geringer als der Abstand der beiden gegenüberliegenden Siebflächen 4. Dies bedeutet, daß zwischen jeder Siebfläche 4 und der Stirnseite 9 der Unterdruckleitung 8 sich ein Zwischenraum ausbildet, der beim Einfüllen von Hinterfüllmasse 10 in die Vorrichtung 9 mit Hinterfüllmasse ausgefüllt ist.The device 1 according to the invention shown in FIGS. 1 and 2 consists of a rectangular molding box 2, which is open on its lower and upper side, in the side walls of which a circumferential vacuum collecting duct 3 is arranged. To the interior of the device 1, this vacuum collecting duct is opened on two opposite sides 5, 6 via a sieve surface 4. A plurality of supports 7 are attached to the screen surfaces 4 and serve to receive a vacuum line 8. The length of this vacuum line 8 is slightly less than the distance between the two opposite sieve surfaces 4. This means that between each sieve surface 4 and the end face 9 of the vacuum line 8, an intermediate space is formed, which is filled with backfill when filling the backfill 10 into the device 9 is.

Zur Einstellung eines definierten Abstandes zwischen den Stirnflächen 9 der Unterdruckleitung 8 und den Siebflächen 4 der Seitenwände 5, 6 sind die Auflager 7 stufenförmig ausgebildet und bilden einen Anschlag 11 für die Unterdruckleitung 8, so daß diese in ihrem Abstand zu den Siebflächen 4 fixiert ist. Oberhalb jedes Auflagers 7 ist eine federnde Lasche 12 angeordnet, die über das Ende der Unterdruckleitung 8 greift und diese gegen das Auflager 7 preßt. Hierdurch ist die Unterdruckleitung 8 in der Vorrichtung 1 auch in lotrechter Richtung fixiert, so daß auch Rüttelbewegungen zur Verdichtung der Hinterfüllmasse 10 diese nicht innerhalb der Vorrichtung 1 verschieben.In order to set a defined distance between the end faces 9 of the vacuum line 8 and the sieve surfaces 4 of the side walls 5, 6, the supports 7 are of stepped design and form a stop 11 for the vacuum line 8, so that the latter is fixed at a distance from the sieve surfaces 4. Above each support 7 there is a resilient tab 12 which extends over the end of the vacuum line 8 and presses it against the support 7. As a result, the vacuum line 8 is also fixed in the vertical direction in the device 1, so that shaking movements for compressing the backfill material 10 do not displace it within the device 1.

Die Unterdruckleitung 8, die auf ihrer gesamten Umfangsfläche Evakuierungsöffnungen aufweist, ist an ihren beiden Enden trompetenförmig ausgebildet, so daß die an ihren Stirnflächen ausgebildeten Siebflächen 13 einen größeren Querschnitt aufweisen als der Querschnitt der übrigen Unterdruckleitung 8. Hierdurch ist eine bessere Ankoppelung der Unterdruckleitung 8 an den Unterdrucksammelkanal 3 in der Vorrichtung 1 gegeben. Dieser Unterdrucksammelkanal 3 ist mit einem Anschluß 14 versehen, über den der Unterdruckkanal an eine Unterdruckquelle, z. B. eine Vakuumpumpe, anschließbar ist.The vacuum line 8, which has evacuation openings on its entire circumferential surface, is trumpet-shaped at both ends, so that the screen surfaces 13 formed on its end faces have a larger cross section than the cross section of the other vacuum line 8. This results in a better coupling of the vacuum line 8 given the vacuum manifold 3 in the device 1. This vacuum manifold 3 is provided with a connection 14 through which the vacuum channel to a vacuum source, for. B. a vacuum pump can be connected.

In Fig. 1 ist die erfindungsgemäße Vorrichtung 1 auf eine Modellplatte 16 aufgesetzt, die ein Modell 15 trägt. Die Modellplatte 16 ist wiederum mit einem Unterdruckkanal 17 versehen, der über einen Anschluß 18 an eine nicht weiter dargestellte Unterdruckquelle anschließbar ist. Der Unterdruckkanal 17 ist über Bohrungen 19 mit der Oberseite der Modellplatte verbunden, so daß die auf die Modellplatte aufgelegte Folie 20 an die Modellplatte und das Modell angesogen wird. Zur weiteren Herstellung einer Gießform wird anschließend bei eingesetzten Unterdruckleitungen 8 Hinterfüllmittel über die noch freie Oberseite der Vorrichtung 1 eingefüllt und gegebenenfalls mittels eines Rüttlers vorverdichtet. Anschließend wird eine Deckfolie 21 auf die Vorrichtung 1 aufgelegt und der Innenraum der Vorrichtung über den Unterdrucksammelkanal 3 und die Evakuierungsleitungen 8 evakuiert. Die Ankopplung der Unterdruckleitung 8 an den Unterdrucksammelkanal 3 erfolgt über eine zwischen den beiden Siebflächen 4 und 13 der Vorrichtung bzw. der Unterdruckleitung 8 befindliche dünne Schicht aus Hinterfüllmasse. Die Dicke dieser Hinterfüllmasseschicht wird durch den Abstand der beiden Siebflächen 4 und durch die Länge der Unterdruckleitung 8 bestimmt.In Fig. 1, the device 1 according to the invention is placed on a model plate 16 which carries a model 15. The model plate 16 is in turn provided with a vacuum channel 17, which can be connected via a connection 18 to a vacuum source, not shown. The vacuum channel 17 is connected via holes 19 to the top of the model plate, so that the film 20 placed on the model plate is sucked onto the model plate and the model. For the further production of a casting mold, 8 backfill agent is then poured in via the still free upper side of the device 1 and, if necessary, pre-compressed by means of a vibrator. A cover film 21 is then placed on the device 1 and the interior of the device is evacuated via the vacuum collecting duct 3 and the evacuation lines 8. The vacuum line 8 is coupled to the vacuum collecting duct 3 via a thin layer of backfill material located between the two screen surfaces 4 and 13 of the device or the vacuum line 8. The thickness of this Backfill mass layer is determined by the distance between the two screen surfaces 4 and by the length of the vacuum line 8.

Nach dem Verfestigen der Hinterfüllmasse 10 wird der Unterdruck in der Unterdruckleitung 17 der Modellplatte 16 aufgehoben, so daß nunmehr die Vorrichtung 1 von der Modellplatte 16 abgehoben werden kann. Die andere Gießformhälfte wird in gleicher Weise hergestellt und der Abguß erfolgt nach Zusammensetzen der beiden Gießformhälften zu einer Gießform.After the backfill mass 10 has solidified, the negative pressure in the negative pressure line 17 of the model plate 16 is released, so that the device 1 can now be lifted off the model plate 16. The other mold half is produced in the same way and the casting takes place after the two mold halves have been assembled into a mold.

Tritt bei einer erfindungsgemäßen Vorrichtung ein Defekt an der Unterdruckleitung 8 auf, so daß Hinterfüllmittel 10 oder aber auch flüssige Schmelze in die Unterdruckleitung 8 eindringen kann, so ist als maximaler Schaden zu erwarten, daß die betreffende Unterdruckleitung den entsprechenden Bereich der Gießform nicht mehr evakuieren kann. Dies ist in der Regel nicht von wesentlicher Bedeutung, denn die benachbarten Unterdruckleitungen 8 oder aber die stirnseitigen Siebflächen 4 können die Aufgabe der ausgefallenen Unterdruckleitung 8 zumindest überwiegend übernehmen. Wenn im Gegensatz hierzu bei einer konventionellen Vorrichtung Hinterfüllmittel oder aber auch Schmelze in die Unterdruckleitung 8 eingedrungen wäre, so hätte dies zur Folge gehabt, daß auch der Unterdrucksammelkanal 3 mit Hinterfüllmasse oder mit Schmelze ausgefüllt worden wäre, so daß der gesamte Unterdruck in der Hinterfüllmasse aufgehoben worden wäre. Die Folge wäre ein großer Schaden und die Gefahr eines Unfalls.If a defect occurs in the vacuum line 8 in a device according to the invention, so that backfill 10 or else liquid melt can penetrate into the vacuum line 8, the maximum damage that can be expected is that the vacuum line in question can no longer evacuate the corresponding area of the casting mold . This is generally not essential, because the adjacent vacuum lines 8 or the front screen surfaces 4 can at least predominantly take over the task of the failed vacuum line 8. In contrast, if in a conventional device backfill or melt had penetrated into the vacuum line 8, this would have had the consequence that the vacuum manifold 3 would have been filled with backfill or melt, so that the entire vacuum in the backfill was released would have been. The consequence would be great damage and the risk of an accident.

Beschädigte Unterdruckleitungen 8 sind bei einer erfindungsgemäßen Vorrichtung sehr einfach auszuwechseln, da diese, sofern überhaupt mechanische Halterungen in der Vorrichtung vorgesehen sind, lediglich durch einfache Klemmvorrichtungen gehalten sind. Das Auswechseln der Unterdruckleitungen ist somit mit wenigen Handgriffen möglich.Damaged vacuum lines 8 are very easy to replace in a device according to the invention, since, if mechanical holders are provided in the device at all, they are only held by simple clamping devices. The vacuum lines can be replaced in just a few simple steps.

Claims (7)

1. Apparatus for the vacuum-forming process for producing casting moulds from refractory backfill material free of binding agent, which is contained between sheets and which is consolidated by vacuum created inside the backfill material, with a mould box (2) which in at least one wall (5, 6) has a vacuum manifold (3) and at least one vacuum duct (8) which is arranged in the mould cavity of the mould box receiving the backfill material (10), which is operatively connected to the vacuum manifold (3) and has evacuation openings spaced apart on its periphery, characterised in that through a screen surface (4) the vacuum manifold (3) is open towards the mould cavity, and in that at at least one end face (9) the vacuum duct (8) is likewise provided with a screen surface (13) and is so disposed in the mould box (2) that its screen surface (13) lies opposite the screen surface (4) of the mould box (2) at a distance which allows the admission of backfill material.
2. Apparatus according to Claim 1, characterised in that in at least two opposing side walls the mould box (2) has vacuum manifolds (3) which are open towards the interior of the mould box (2) via a respective screen surface (4), and in that between two respective opposing screen surfaces (4) there are disposed vacuum ducts (8), the length of each of which is slightly less than the distance apart of the opposing screen surfaces and which are closed at their two end faces (9) via a respective screen surface (13).
3. Apparatus according to Claim 1 or 2, characterised in that the ends of the vacuum ducts (8) are flared in trumpet-like manner.
4. Apparatus according to one of Claims 1 to 3, characterised in that supports (7) for the vacuum ducts (8) are arranged on the inner walls of the mould box (2) having the screen surfaces (4).
5. Apparatus according to Claim 4, characterised in that the supports (7) have abutments (11) acting as spacing elements for the setting of a definite distance between the screen surfaces (4) of the mould box (2) and the screen surfaces (13) of each vacuum duct (8).
6. Apparatus according to one of Claims 1 to 5, characterised in that securing elements (12) for the vacuum ducts (8) are provided above the supports (7).
7. Apparatus according to Claim 6, characterised in that the securing elements comprise resilient tongues (12).
EP82105047A 1981-06-12 1982-06-09 Device for producing moulds Expired EP0067413B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105047T ATE10813T1 (en) 1981-06-12 1982-06-09 DEVICE FOR THE MANUFACTURE OF MOLDS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3123363A DE3123363C1 (en) 1981-06-12 1981-06-12 Device for the production of molds
DE3123363 1981-06-12

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EP0067413A1 EP0067413A1 (en) 1982-12-22
EP0067413B1 true EP0067413B1 (en) 1984-12-19

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EP (1) EP0067413B1 (en)
AT (1) ATE10813T1 (en)
DE (1) DE3123363C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102189231A (en) * 2010-03-10 2011-09-21 新东工业株式会社 Section box for decompressing and modelling

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
DE3318702C1 (en) * 1983-05-21 1984-03-29 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Molding box for the vacuum molding process
FR2649916A1 (en) * 1989-07-18 1991-01-25 Ferrer Erick Universal mould with adaptable moulding surfaces for moulding plastic, ceramic or other materials
CN101954448A (en) * 2010-11-12 2011-01-26 侯松发 Sealed air chamber model used in vacuum molding process
CN103567395A (en) * 2013-09-30 2014-02-12 张家港万富安化工设备铸件装备有限公司 Vacuumizing device for foundry casting

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Publication number Priority date Publication date Assignee Title
DE1536795A1 (en) * 1967-04-20 1969-10-30 Ferch & Nabben Filter element
BE789785A (en) * 1971-10-08 1973-02-01 Akita Kk MOLD PRODUCTION APPARATUS
US3825058A (en) * 1972-04-15 1974-07-23 Sintokogio Ltd Mold prepared by vacuum sealed molding process
DE8029438U1 (en) * 1980-11-05 1981-03-19 Passavant-Werke Michelbacher Hütte, 6209 Aarbergen MOLDING BOX FOR THE VACUUM FORMING PROCESS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102189231A (en) * 2010-03-10 2011-09-21 新东工业株式会社 Section box for decompressing and modelling

Also Published As

Publication number Publication date
EP0067413A1 (en) 1982-12-22
ATE10813T1 (en) 1985-01-15
DE3123363C1 (en) 1982-11-04

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