EP0089547B1 - Method and device for compacting foundry moulding sand - Google Patents
Method and device for compacting foundry moulding sand Download PDFInfo
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- EP0089547B1 EP0089547B1 EP83102255A EP83102255A EP0089547B1 EP 0089547 B1 EP0089547 B1 EP 0089547B1 EP 83102255 A EP83102255 A EP 83102255A EP 83102255 A EP83102255 A EP 83102255A EP 0089547 B1 EP0089547 B1 EP 0089547B1
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- gas
- mass
- mold
- pattern
- molding material
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000004576 sand Substances 0.000 title abstract 2
- 238000000465 moulding Methods 0.000 title description 12
- 239000000463 material Substances 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 12
- 238000005056 compaction Methods 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 14
- 239000004744 fabric Substances 0.000 claims description 4
- 239000002923 metal particle Substances 0.000 claims description 3
- 239000003110 molding sand Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims 1
- 238000004880 explosion Methods 0.000 abstract description 4
- 239000012778 molding material Substances 0.000 description 38
- 238000007906 compression Methods 0.000 description 20
- 230000006835 compression Effects 0.000 description 16
- 238000005243 fluidization Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
Definitions
- the invention relates to a method and a device for compacting foundry molding material, in particular wet molding sand, by the sudden action of gas pressure on the molding material heaped over the model.
- Compression methods of this type are known in several embodiments (e.g. DE-B-1 961 234, DE-A-29 49 340) and have recently gained increasing economic importance. They differ essentially in the way in which the pressure wave is generated. For example, either a high-pressure gas contained in a pre-pressure space is suddenly released (DE-B-1 961 234) or the gas pressure is generated directly above the molding space by the explosion of a combustible gas mixture. In addition to these two basic methods, a large number of variants are known, which need not be discussed here, since they do not affect the invention. In all embodiments, the pressure wave generated hits the molding material surface and then leads to compression of the molding material.
- the degree of compression depends not only on the parameters (pressure, speed) of the gas pressure wave, but also on the height of the molding material filling.
- the mold material coverage of the model below which a satisfactory degree of compaction can no longer be achieved.
- the molding material coverage above which the mold back in particular no longer has sufficient compression. It is therefore usually worked with an excess of molding material, which in the former case leads to an unnecessary height of the mold, in the second case to an unnecessary excess of molding material which must be stripped off after compression.
- the invention is based on the object of proposing a method and a device with the aid of which uniform compaction over the mold height can be achieved with a minimal requirement for molding material.
- This object is achieved in that a gas-permeable, freely movable additional mass is loosely placed on the free molding material surface and that the gas pressure is brought into effect on the free surface of the additional mass.
- the invention also differs from other known proposals, according to which a cover is placed on the surface of the molding material. This acts, even if it is made of elastic material (US-A-2 830 339), practically like a compression piston, without the compression gas being able to penetrate into the molding material bed.
- a cover is placed on the surface of the molding material. This acts, even if it is made of elastic material (US-A-2 830 339), practically like a compression piston, without the compression gas being able to penetrate into the molding material bed.
- DE-A-29 49 340 in which the molding surface is completely or partially provided with a gas-impermeable cover in the course of an explosion compression. This is said to either prevent the molding material from crumbling at the back of the mold or to provide less densely compressed areas at the covered areas.
- the molding surface is approximately uniformly flat, which cannot be achieved with the previously known methods. Due to the optimization of the molding material mass, the molding material supernatant, which is necessary in many cases, can be better regulated and, above all, set at a lower height.
- the gas energy ie the gas pressure and / or the gas volume, can be reduced compared to the known methods with the additional mass, so that in particular there is a reduction in the gas requirement.
- the fiction can Carry out appropriate procedures regardless of whether the molding material is compressed from above or from below.
- the additional mass consists of several individual masses which are movable in the direction perpendicular to the molding material surface, it is ensured that each individual mass can move in accordance with the impulse force communicated by the pressure wave and pass it on to the molding material particles.
- the additional mass has a distribution of the individual mass adapted to the contour of the model in such a way that the mass is lower over high model contours than over deep contours.
- the invention is based on a device with a mold box closed on one side by a model plate with the model, a filling frame that continues this, and a device for generating or storing gas at high pressure, which suddenly has an effect on the molding material in the filling frame brought.
- Such a device is characterized in accordance with the invention in that a gas-permeable additional mass which covers this in total can be placed on the free molding material surface and can be removed therefrom after compression.
- the additional mass is thus in each working cycle of the device, for. B. a molding machine, placed on the molding material filled in the mold space, then brought the gas pressure wave to effect and after venting the mold space, the additional mass removed from the compressed mold.
- the additional mass can be formed from a perforated plate, but in a preferred embodiment of the device consists of particles of greater specific weight than the molding material and a gas-permeable and flexible covering enclosing these particles.
- the flow resistance of this additional mass and thus the thrust force generated by it can be influenced by the particle shape and its bulk density, so that regulation of the desired effects is possible not only via the size of the additional mass, but also via the aforementioned parameters.
- the additional mass advantageously consists of a bed of metal particles and a fabric enclosing them.
- the metal particles can be, for example, granules, shot or the like, while the fabric can be made of plastic or - in the case of compression by explosive forces with corresponding temperature development - made of wire.
- the additional mass constructed in this way is, at least to a limited extent, freely suspended or supported, so that it can be placed and removed on the one hand and can follow the forces acting on it unhindered on the other hand.
- a model plate 1 with a model 2 can be seen, which closes a molding box 3 on the underside.
- a filling frame 4 is placed on the molding box 3 and is continued in a gas collecting space 5.
- an end plate 6 can be seen as an integral part of a machine stand, against which the parts of the molding space are pressed before the compression process.
- the devices necessary for the manipulation of the molding box 3, the filling frame 4 and the gas collecting space 5, as well as those for filling the molding space with molding sand, can be of a conventional type and are therefore not shown in detail.
- a container 7 is connected to the gas collecting space 5 via a line 8, in which container either compressed gas is stored or is generated by the explosion of a combustible gas mixture.
- a valve can optionally be arranged which, after opening, allows the pressure wave to pass into the gas collecting space.
- This device also includes an additional mass 10 which is placed on the free molding material surface 11 within the filling frame 4 before the compression process.
- This additional mass 10 consists of an outer shell 12, for example a perforated plate, a fabric or the like. And a filling 13 enclosed by this of particles of high specific weight, for. B. metal granules, metal shot or the like.
- the additional mass is fastened to a lifting device 14 by means of a pull rope 15, by means of which it can be lowered onto the surface of the molding material and later lifted from the compacted form.
- the traction cable 15 gives the additional mass 10 the freedom of movement necessary for the compression stroke in the direction perpendicular to the molding material surface.
- the additional mass can also be mounted on the lifting device 14 via a pawl which engages with a corresponding catch on the additional mass in order to be able to lift it off the finished shape. To apply the additional mass, this latch then only has to be loosened so that it falls on the molding material filling.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Verdichtung von Gießereiformstoff, insbesondere von Naßformsand, durch schlagartige Einwirkung von Gasdruck auf den über dem Modell aufgeschütteterr Formstoff.The invention relates to a method and a device for compacting foundry molding material, in particular wet molding sand, by the sudden action of gas pressure on the molding material heaped over the model.
Verdichtungsverfahren dieser Art sind in mehreren Ausführungsformen bekannt (z. B. DE-B-1 961 234, DE-A-29 49 340) und gewinnen in neuerer Zeit zunehmend an wirtschaftlicher Bedeutung. Sie unterscheiden sich im wesentlichen in der Art der Erzeugung der Druckwelle. So wird entweder ein in einem Vordruckraum enthaltenes, hochgespanntes Gas schlagartig zur Entspannung gebracht (DE-B-1 961 234) oder aber wird unmittelbar oberhalb des Formraums der Gasdruck durch Explosion eines brennbaren Gasgemischs erzeugt. Neben diesen beiden prinzipiellen Verfahren sind eine Vielzahl von Varianten bekannt, auf die hier nicht näher einzugehen ist, da sie die Erfindung nicht berühren. In allen Ausführungsformen läuft die erzeugte Druckwelle auf die Formstoffoberfläche auf und führt dann zu einer Verdichtung des Formstoffs.Compression methods of this type are known in several embodiments (e.g. DE-B-1 961 234, DE-A-29 49 340) and have recently gained increasing economic importance. They differ essentially in the way in which the pressure wave is generated. For example, either a high-pressure gas contained in a pre-pressure space is suddenly released (DE-B-1 961 234) or the gas pressure is generated directly above the molding space by the explosion of a combustible gas mixture. In addition to these two basic methods, a large number of variants are known, which need not be discussed here, since they do not affect the invention. In all embodiments, the pressure wave generated hits the molding material surface and then leads to compression of the molding material.
Über die Ursachen und Wirkungen bei dieser Art der Formstoffverdichtung konnte noch keine endgültige Klarheit erreicht werden. Es ist jedoch so viel bekannt, daß sich die Verdichtung aus dem Zusammenwirken von Fluidisierungs-Effekten einerseits und an den Formstoffpartikeln wirksam werdenden Staukräften andererseits einstellt. Die Fluidisierung führt zu einer Verminderung der Grenzflächenkräfte zwischen den Formstoffpartikein untereinander wie auch zwischen diesen und dem Modell bzw. dem Formkasten und dem Füllrahmen, so daß die auf das einzelne Formstoffpartikel von dem Gas oder von benachbarten Partikeln ausgeübten Impulskräfte zu einer dichteren Packung des Formstoffs führen.No definitive clarity has yet been reached about the causes and effects of this type of molding material compression. However, it is so well known that the compression results from the interaction of fluidization effects on the one hand and the ram forces which become effective on the molding material particles on the other hand. The fluidization leads to a reduction in the interfacial forces between the molding material particles with one another and also between them and the model or the molding box and the filling frame, so that the impulse forces exerted on the individual molding material particles by the gas or by neighboring particles lead to a denser packing of the molding material .
Es ist weiterhin beobachtet worden, daß der Verdichtungsgrad nicht nur von den Parametern (Druck, Geschwindigkeit) der Gasdruckwelle, sondern auch von der Höhe der Formstoff-Füllung abhängig ist. So gibt es eine untere Grenze für die Formstoffüberdeckung des Modells, unterhalb der sich kein befriedigender Verdichtungsgrad mehr erreichen läßt. Andererseits gibt es auch eine obere Grenze für die Formstoffüberdeckung, oberhalb der insbesondere der Formrücken keine ausreichende Verdichtung mehr besitzt. Es wird deshalb in der Regel mit einem Formstoff-Überschuß gearbeitet, der im erstgenannten Fall zu einer an sich unnötigen Formhöhe, im zweiten Fall zu einem unnötigen Formstoff-Überstand führt, der nach dem Verdichten abgestreift werden muß.It has also been observed that the degree of compression depends not only on the parameters (pressure, speed) of the gas pressure wave, but also on the height of the molding material filling. For example, there is a lower limit for the mold material coverage of the model, below which a satisfactory degree of compaction can no longer be achieved. On the other hand, there is also an upper limit for the molding material coverage, above which the mold back in particular no longer has sufficient compression. It is therefore usually worked with an excess of molding material, which in the former case leads to an unnecessary height of the mold, in the second case to an unnecessary excess of molding material which must be stripped off after compression.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung vorzuschlagen, mit deren Hilfe eine gleichmäßige Verdichtung über die Formhöhe bei minimalen Formstoffbedarf erreicht werden kann.The invention is based on the object of proposing a method and a device with the aid of which uniform compaction over the mold height can be achieved with a minimal requirement for molding material.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß auf die freie Formstoff-Oberfläche eine gasdurchlässige, freibewegliche Zusatzmasse lose aufgelegt und daß der Gasdruck auf die freie Oberfläche der Zusatzmasse zur Wirkung gebracht wird.This object is achieved in that a gas-permeable, freely movable additional mass is loosely placed on the free molding material surface and that the gas pressure is brought into effect on the free surface of the additional mass.
Praktische Versuche mit einer solchen Zusatzmasse haben gezeigt, daß bei entsprechender Optimierung ein gleichmäßiger Verdichtungsgrad sowohl über den Formquerschnitt, als auch über die Formhöhe erreicht werden kann, wobei die Formstoff-Überdeckung oberhalb der Modellkontur auf das für die Transport- und Abgußfestigkeit der Form erforderliche Maß beschränkt werden kann. Beim Verdichtungsvorgang kann die Gasdruckwelle die Zusatzmasse bei nicht allzu großem Strömungswiderstand durchwandern und in die Formstoffschüttung eindringen. Der Fluidisierungseffekt wird also durch die Zusatzmasse nicht beeinträchtigt. Die für die eigentliche Verdichtung verantwortlichen Staukräfte werden sowohl an den Formstoffpartikein, als auch an den gasundurchlässigen Bereichen der Zusatzmasse wirksam, wobei letztere die ihr erteilten Impulskräfte an die Formstoffpartikel weitergibt.Practical tests with such an additional mass have shown that, with appropriate optimization, a uniform degree of compaction can be achieved both over the mold cross-section and over the mold height, with the molding material overlap above the model contour to the level required for the transport and casting strength of the mold can be limited. During the compression process, the gas pressure wave can pass through the additional mass if the flow resistance is not too great and penetrate into the molding material. The additional mass does not affect the fluidization effect. The dynamic forces responsible for the actual compression are effective both on the molding material particles and on the gas-impermeable areas of the additional mass, the latter passing on the momentum forces imparted to the molding material particles.
Wichtig ist dabei, daß die Zusatzmasse auf der freien Formstoff-Oberfläche aufliegt und nicht etwa freifliegend auf die Formstoff-Oberfläche aufprallt, da hiermit eine unerwünscht vorzeitige Vorverdichtung auf dem Formrücken entstehen würde. Hiermit unterscheidet sich die Erfindung auch von anderen bekannten Vorschlägen, wonach auf die Formstoff-Oberfläche eine Abdeckung aufgelegt wird. Diese wirkt, auch wenn sie aus elastischem Material besteht (US-A-2 830 339), praktisch wie ein Verdichtungskolben, ohne daß das verdichtende Gas in die Formstoffschüttung eindringen kann. Gleiches gilt für einen anderen bekannten Vorschlag (DE-A-29 49 340) bei dem im Rahmen einer Explosionsverdichtung die Formstoffoberfläche ganz oder teilweise mit einer gasundurchlässigen Abdeckung versehen wird. Hiermit soll entweder das Ausbröckeln des Formstoffs am Formrücken vermieden oder aber an den abgedeckten Stellen weniger stark verdichtete Bereiche erhalten werden.It is important that the additional mass rests on the free surface of the molding material and does not hit the surface of the molding material in a free-floating manner, since this would result in undesired premature compression on the back of the mold. The invention also differs from other known proposals, according to which a cover is placed on the surface of the molding material. This acts, even if it is made of elastic material (US-A-2 830 339), practically like a compression piston, without the compression gas being able to penetrate into the molding material bed. The same applies to another known proposal (DE-A-29 49 340) in which the molding surface is completely or partially provided with a gas-impermeable cover in the course of an explosion compression. This is said to either prevent the molding material from crumbling at the back of the mold or to provide less densely compressed areas at the covered areas.
Es hat sich ferner bei dem erfindungsgemäßen Verfahren gezeigt, daß nach dem Verdichtungsvorgang die Formstoff-Oberfläche annähernd gleichmäßig eben ist, was sich mit den bisher bekannten Verfahren nicht erreichen läßt. Aufgrund der Optimierung der Formstoffmasse läßt sich auch der in vielen Fällen notwendige Formstoff-Überstand besser regulieren und vor allem in geringerer Höhe einstellen. Bei gegebener Formgröße und Formstoff-Füllung und einem bestimmten Verdichtungsgrad läßt sich gegenüber den bekannten Verfahren mit der Zusatzmasse die Gasenergie, d. h. der Gasdruck und/ oder das Gasvolumen reduzieren, so daß insbesondere eine Verminderung des Gasbedarfs gegeben ist. Schließlich läßt sich das erfindungsgemäße Verfahren unabhängig davon durchführen, ob die Verdichtung des Formstoffs von oben oder von unten her erfolgt.It has also been shown in the method according to the invention that after the compression process the molding surface is approximately uniformly flat, which cannot be achieved with the previously known methods. Due to the optimization of the molding material mass, the molding material supernatant, which is necessary in many cases, can be better regulated and, above all, set at a lower height. For a given mold size and molding material filling and a certain degree of compression, the gas energy, ie the gas pressure and / or the gas volume, can be reduced compared to the known methods with the additional mass, so that in particular there is a reduction in the gas requirement. Finally, the fiction can Carry out appropriate procedures regardless of whether the molding material is compressed from above or from below.
Durch bevorzugte weitere Maßnahmen, daß die Zusatzmasse aus mehreren in Richtung senkrecht zur Formstoff-Oberfläche beweglichen Einzelmassen besteht, ist gewährleistet, daß sich jede Einzelmasse entsprechend der ihr von der Druckwelle mitgeteilten Impulskraft bewegen und diese an die Formstoffpartikel weitergeben kann.By means of preferred further measures that the additional mass consists of several individual masses which are movable in the direction perpendicular to the molding material surface, it is ensured that each individual mass can move in accordance with the impulse force communicated by the pressure wave and pass it on to the molding material particles.
Gemäß einer weiteren vorteilhaften Ausführung ist vorgesehen, daß die Zusatzmasse eine der Kontur des Modells angepaßte Verteilung der Einzelmasse aufweist derart, daß die Masse über hohen Modellkonturen geringer ist als über tiefe Konturen.According to a further advantageous embodiment it is provided that the additional mass has a distribution of the individual mass adapted to the contour of the model in such a way that the mass is lower over high model contours than over deep contours.
Zur Durchführung des vorgenannten Verfahrens geht die Erfindung von einer Vorrichtung mit einem einseitig von einer Modellplatte mit dem Modell abgeschlossenen Formkasten, einem diesen fortsetzenden Füllrahmen, und einer Einrichtung zum Erzeugen oder Speichern von Gas hohen Drucks aus, das auf den Formstoff im Füllrahmen schlagartig zur Wirkung gebracht wird.To carry out the aforementioned method, the invention is based on a device with a mold box closed on one side by a model plate with the model, a filling frame that continues this, and a device for generating or storing gas at high pressure, which suddenly has an effect on the molding material in the filling frame brought.
Eine solche Vorrichtung zeichnet sich erfindungsgemäß dadurch aus, daß auf die freie Formstoff-Oberfläche eine dies insgesamt abdeckende, gasdurchlässige Zusatzmasse auflegbar und von dieser nach der Verdichtung abhebbar ist.Such a device is characterized in accordance with the invention in that a gas-permeable additional mass which covers this in total can be placed on the free molding material surface and can be removed therefrom after compression.
Die Zusatzmasse wird also bei jedem Arbeitszyklus der Vorrichtung, z. B. einer Formmaschine, auf den in den Formraum eingefüllten Formstoff aufgelegt, anschließend die Gasdruckwelle zur Wirkung gebracht und nach dem Entlüften des Formraums die Zusatzmasse von der verdichteten Form wieder abgenommen.The additional mass is thus in each working cycle of the device, for. B. a molding machine, placed on the molding material filled in the mold space, then brought the gas pressure wave to effect and after venting the mold space, the additional mass removed from the compressed mold.
Die Zusatzmasse kann im einfachsten Fall von einem Lochblech gebildet sein, besteht jedoch bei einer bevorzugten Ausführungsform der Vorrichtung aus Partikeln größeren spezifischen Gewichtes als der Formstoff und einer diese Partikel einschließenden, gasdurchlässigen und flexiblen Umhüllung. Der Strömungswiderstand dieser Zusatzmasse und damit die von ihr erzeugte Schubkraft läßt sich durch die Partikelform und ihre Schüttdichte beeinflussen, so daß nicht nur über die Größe der Zusatzmasse, sondern auch über die vorgenannten Parameter eine Regulierung der gewünschten Effekte möglich ist. Mit Vorteil besteht die Zusatzmasse aus einer Schüttung von Metallpartikeln und einem diese einschließenden Gewebe. Bei den Metallpartikeln kann es sich beispielsweise um Granulat, Schrot od. dgl. handeln, während das Gewebe ein solches aus Kunststoff oder - im Falle einer Verdichtung durch Explosivkräfte mit entsprechender Temperaturentwicklung - aus Draht sein kann.In the simplest case, the additional mass can be formed from a perforated plate, but in a preferred embodiment of the device consists of particles of greater specific weight than the molding material and a gas-permeable and flexible covering enclosing these particles. The flow resistance of this additional mass and thus the thrust force generated by it can be influenced by the particle shape and its bulk density, so that regulation of the desired effects is possible not only via the size of the additional mass, but also via the aforementioned parameters. The additional mass advantageously consists of a bed of metal particles and a fabric enclosing them. The metal particles can be, for example, granules, shot or the like, while the fabric can be made of plastic or - in the case of compression by explosive forces with corresponding temperature development - made of wire.
Die solchermaßen aufgebaute Zusatzmasse ist zumindest begrenzt frei beweglich aufgehängt bzw. abgestützt, so daß sie einerseits aufgelegt und abgenommen, andererseits den auf sie wirkenden Kräften ungehindert folgen kann.The additional mass constructed in this way is, at least to a limited extent, freely suspended or supported, so that it can be placed and removed on the one hand and can follow the forces acting on it unhindered on the other hand.
Nachstehend ist die Erfindung anhand eines in der Zeichnung im Längsschnitt gezeigten Ausführungsbeispiels einer Vorrichtung beschrieben.The invention is described below with reference to an embodiment of a device shown in longitudinal section in the drawing.
In der Zeichnung ist eine Modellplatte 1 mit einem Modell 2 erkennbar, die einen Formkasten 3 unterseitig abschließt. Auf den Formkasten 3 ist ein Füllrahmen 4 aufgesetzt, der seine Fortsetzung in einem Gassammelraum 5 findet. Oberhalb diese eigentlichen Formraums ist eine Abschlußplatte 6 als fester Bestandteil eines Maschinenständers erkennbar, gegen den die Teile des Formraums vor dem Verdichtungsvorgang angepreßt werden. Die im übrigen für die Manipulation des Formkastens 3, des Füllrahmens 4 und des Gassammelraums 5 notwendigen Einrichtungen, wie auch die zur Füllung des Formraums mit Formsand können von üblicher Art sein und sind deshalb nicht näher dargestellt.In the drawing, a
Beim dargestellten Ausführungsbeispiel ist an den Gassammelraum 5 über eine Leitung 8 ein Behälter 7 angeschlossen, in welchem entweder Druckgas gespeichert oder durch die Explosion eines brennbaren Gasgemisches erzeugt wird. In der Verbindungsleitung 8 kann gegebenenfalls ein Ventil angeordnet sein, das nach Öffnen die Druckwelle in den Gassammelraum übertreten läßt.In the illustrated embodiment, a
Zu dieser Vorrichtung gehört ferner eine Zusatzmasse 10, die auf die freie Formstoffoberfläche 11 innerhalb des Füllrahmens 4 vor dem Verdichtungsvorgang aufgelegt wird. Diese Zusatzmasse 10 besteht aus einer äußeren Hülle 12, beispielsweise einem Lochblech, einem Gewebe od. dgl. und einer von dieser eingeschlossenen Füllung 13 aus Partikeln hohne spezifischen Gewichtes, z. B. Metallgranulat, Metallschrot od. dgl.This device also includes an
Die Zusatzmasse ist bei dem wiedergegebenen Ausführungsbeispiel über eine Zugseil 15 an einer Hubvorrichtung 14 befestigt, mittels der sie auf die Formstoff-Oberfläche abgesenkt und später von der verdichteten Form abgehoben werden kann. Das Zugseil 15 gibt dabei der Zusatzmasse 10 die beim Verdichtungshub notwendige Bewegungsfreiheit in Richtung senkrecht zur Formstoff-Oberfläche. Statt einer solchen Aufhängung kann die Zusatzmasse an der Hubvorrichtung 14 auch über eine Klinke gelagert sein, die an einer entsprechenden Raste an der Zusatzmasse eingreift, um diese von der fertigen Form abheben zu können. Zum Auflegen der Zusatzmasse braucht dann diese Klinke lediglich gelöst werden, so daß sie auf die Formstoff-Füllung fällt.In the exemplary embodiment shown, the additional mass is fastened to a lifting device 14 by means of a
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT83102255T ATE19973T1 (en) | 1982-03-23 | 1983-03-08 | METHOD AND DEVICE FOR COMPRESSING FOUNDRY MOLDING MATERIAL. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3210504 | 1982-03-23 | ||
| DE3210504 | 1982-03-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0089547A1 EP0089547A1 (en) | 1983-09-28 |
| EP0089547B1 true EP0089547B1 (en) | 1986-05-28 |
Family
ID=6158983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83102255A Expired EP0089547B1 (en) | 1982-03-23 | 1983-03-08 | Method and device for compacting foundry moulding sand |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4538664A (en) |
| EP (1) | EP0089547B1 (en) |
| JP (1) | JPS58173056A (en) |
| AT (1) | ATE19973T1 (en) |
| DD (1) | DD207343A5 (en) |
| DE (1) | DE3363683D1 (en) |
| PL (1) | PL241133A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3317196A1 (en) * | 1983-05-11 | 1984-11-22 | BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe | DEVICE FOR COMPRESSING FOUNDRY SAND |
| CH659782A5 (en) * | 1983-06-02 | 1987-02-27 | Fischer Ag Georg | METHOD AND DEVICE FOR COMPRESSING GRAINY MOLDS. |
| DE3321955A1 (en) * | 1983-06-18 | 1984-12-20 | BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe | DEVICE FOR COMPRESSING FOUNDRY MOLD BY PRESSURE GAS |
| CH666426A5 (en) * | 1984-06-25 | 1988-07-29 | Fischer Ag Georg | MOLDING PLANT. |
| US5535809A (en) * | 1993-11-24 | 1996-07-16 | Grand Haven Brass Foundry | Method and apparatus for packing a granular material for foundry use |
| JP3273582B2 (en) * | 1994-05-13 | 2002-04-08 | キヤノン株式会社 | Storage device |
| ES2131433B1 (en) * | 1996-01-18 | 2000-03-01 | Loramendi Sa | HIGH COMPACTION DEVICE FOR MOLDING MACHINES OF SAND BOXES BY AIR IMPACT. |
| WO1998045070A1 (en) * | 1997-04-08 | 1998-10-15 | Loramendi, S.A. | High compaction device for sand box molding machines using air impact |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1961234C3 (en) * | 1969-12-05 | 1975-02-06 | Kramatorskij Nautschno-Issledowatel' Skij I Projektno-Technologitscheskij Institut Maschinostrojenija, Kramatorsk (Sowjetunion) | Method and device for compacting casting molding compounds |
| JPS6047030B2 (en) * | 1977-09-01 | 1985-10-19 | 新東工業株式会社 | mold making machine |
| JPS5581041A (en) * | 1978-12-12 | 1980-06-18 | Sintokogio Ltd | Mold molding method |
| AT381877B (en) * | 1978-12-15 | 1986-12-10 | Fischer Ag Georg | METHOD AND DEVICE FOR COMPRESSING GRANULAR SUBSTANCES, IN PARTICULAR FOUNDRY MOLD |
| GB2079654B (en) * | 1980-07-09 | 1984-04-26 | Sintokogio Ltd | Moulding method and apparatus |
| JPS5722848A (en) * | 1980-07-12 | 1982-02-05 | Sintokogio Ltd | Method for making mold |
-
1983
- 1983-03-08 EP EP83102255A patent/EP0089547B1/en not_active Expired
- 1983-03-08 DE DE8383102255T patent/DE3363683D1/en not_active Expired
- 1983-03-08 AT AT83102255T patent/ATE19973T1/en active
- 1983-03-16 US US06/475,725 patent/US4538664A/en not_active Expired - Fee Related
- 1983-03-22 PL PL24113383A patent/PL241133A1/en unknown
- 1983-03-22 JP JP58046104A patent/JPS58173056A/en active Pending
- 1983-03-22 DD DD83249056A patent/DD207343A5/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DD207343A5 (en) | 1984-02-29 |
| JPS58173056A (en) | 1983-10-11 |
| PL241133A1 (en) | 1984-01-02 |
| DE3363683D1 (en) | 1986-07-03 |
| US4538664A (en) | 1985-09-03 |
| ATE19973T1 (en) | 1986-06-15 |
| EP0089547A1 (en) | 1983-09-28 |
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