EP0089547A1 - Method and device for compacting foundry moulding sand - Google Patents
Method and device for compacting foundry moulding sand Download PDFInfo
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- EP0089547A1 EP0089547A1 EP83102255A EP83102255A EP0089547A1 EP 0089547 A1 EP0089547 A1 EP 0089547A1 EP 83102255 A EP83102255 A EP 83102255A EP 83102255 A EP83102255 A EP 83102255A EP 0089547 A1 EP0089547 A1 EP 0089547A1
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- molding material
- additional mass
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- model
- molding
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000000465 moulding Methods 0.000 title description 12
- 239000004576 sand Substances 0.000 title 1
- 239000012778 molding material Substances 0.000 claims abstract description 52
- 238000007906 compression Methods 0.000 claims abstract description 24
- 230000006835 compression Effects 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000003110 molding sand Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 13
- 239000004744 fabric Substances 0.000 claims description 3
- 239000002923 metal particle Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000004880 explosion Methods 0.000 abstract description 4
- 238000005243 fluidization Methods 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000463 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
- 230000005484 gravity Effects 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
- 239000002759 woven fabric Substances 0.000 description 1
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Classifications
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- 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. Device for compacting foundry molding material, in particular wet molding sand, by the sudden action of gas pressure on the molding material poured over the model.
- Compression processes of this type are known in several embodiments (for example DE-AS 1 961 234, DE-OS 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 chamber is suddenly brought to relaxation (DE-AS 1 961 234) or it is immediately above of the mold space the gas pressure is generated 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 a 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 invention is based on the object of proposing a method and a device with the aid of which uniform compression over the mold height can be achieved with a minimum requirement for molding material.
- This object is achieved in that a gas-permeable additional mass is placed on the free surface of the molding material 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 Pat. No. 2,830,339), practically like a compression piston, without the compression gas being able to penetrate into the bed of molding material.
- a cover is placed on the surface of the molding material. This acts, even if it is made of elastic material (US Pat. No. 2,830,339), practically like a compression piston, without the compression gas being able to penetrate into the bed of molding material.
- DE-OS 29 49 340 in which the molding surface is completely or partially provided with a gas-impermeable cover in the context 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 surface of the molding material is approximately uniformly flat, which is the case with the previously. does not achieve known methods. Due to the optimization of the molding material mass, the molding material supernatant that is necessary in many cases can also be better regulated and, above all, set at a lower height. For a given mold size and mold material filling and a certain degree of compression, the gas energy, i.e. reduce the gas pressure and / or the gas volume, so that there is in particular a reduction in the gas requirement. Finally, the method according to the invention can be carried out regardless of whether the molding material is compressed from above or from below.
- Preferred additional measures such that the additional mass consists of several individual masses which are movable in the direction perpendicular to the molding material surface ensure that each individual mass can move in accordance with the impulse force imparted by the pressure wave and pass it on to the molding material particles.
- the additional mass has a distribution of the individual mass which is adapted to the contour of the model, such that the mass is lower over high model contours than over deep contours.
- the additional mass consists of particles of greater specific gravity 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 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 the entire surface of the molding material can be placed on top of it and can be lifted off from it after compression.
- the additional mass is thus added to each working cycle of the device, e.g. a molding machine, placed on the molding material filled in the molding space, then brought the gas pressure wave into effect and after venting the molding space, the additional mass is removed from the compressed mold.
- a working cycle of the device e.g. a molding machine
- the additional mass can consist of a perforated plate, but in a preferred embodiment of the device is formed by a cushion that at least partially covers the molding material surface and that consists of a bed of metal particles and a fabric that encloses them.
- the metal particles can be, for example, granules, shot or the like, while the woven fabric can be made of plastic or - in the case of compression by explosive forces with appropriate 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, on the other hand, can freely follow the forces acting on it.
- 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 7 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 of high specific weight particles, e.g. Metal granules, metal shot or the like ..
- the additional mass 12 is fastened to a lifting device 14 by means of a traction cable 15, by means of which it can be lowered onto the surface of the molding material and later lifted from the compressed form.
- the Switzerlandsei I 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)
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- Casting Devices For Molds (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Bei einem Verfahren zum Verdichten von Gießereiformstoff, insbesondere von Naßformsand, durch schlagartige Einwirkung von Gasdruck auf die freie Oberfläche des über dem Modell 2 aufgeschütteten Formstoffs wird zur Verbesserung der Verdichtung, zur Regulierung des notwendigen Formstoff-Überstandes auf die freie Formstoff-Oberfläche eine gasdurchlässige Zusatzmasse 10 aufgelegt, die aus mehreren in Richtung senkrecht zur Formstoff-Oberfläche beweglichen Einzelmassen besteht, wobei der Gasdruck auf die freie Oberfläche der Zusatzmasse zur Wirkung gebracht wird. Diese Zusatzmasse 10 findet Anwendung sowohl bei Verdichtungs-verfahren, die mit einer Entspannung von gespeichertem Druckgas oder mit einer durch Explosion erzeugten Druckgaswelle arbeiten.In a process for compacting foundry molding material, in particular wet molding sand, by the sudden action of gas pressure on the free surface of the molding material heaped over the model 2, a gas-permeable additional mass is used to improve the compression and to regulate the necessary molding material excess on the free molding material surface 10 placed, which consists of several individual masses movable in the direction perpendicular to the molding material surface, the gas pressure being brought into effect on the free surface of the additional mass. This additional mass 10 is used both in compression processes that work with an expansion of stored compressed gas or with a pressure gas wave generated by an explosion.
Description
D ie Erfindung betrifft ein Verfahren und eine. Vorrichtung zur Verdichtung von Gießereiformstoff, insbesondere von Naßformsand, durch schlagartige Einwirkung von Gasdruck auf den über dem Modell aufgeschütteten Formstoff.The invention relates to a method and. Device for compacting foundry molding material, in particular wet molding sand, by the sudden action of gas pressure on the molding material poured over the model.
Verdichtungsverfahren dieser Art sind in mehreren Ausführungsformen bekannt (z.B. DE-AS 1 961 234, DE-OS 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-AS 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 Formstoff- oberfläche auf und führt dann zu einer Verdichtung des Formstoffs.Compression processes of this type are known in several embodiments (for example DE-AS 1 961 234, DE-OS 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 chamber is suddenly brought to relaxation (DE-AS 1 961 234) or it is immediately above of the mold space the gas pressure is generated 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 a compression of the molding material.
Über die Ursachen und Wirkungen bei dieser Art der Formstoffverdichtung konnte nochleine endgültige Klarheit erreicht werden. Es ist jedoch so viel bekannt, daß sich die Verdichtung aus dem Zusammenwirken vonFluidisierungs-Effekten einerseits und an den Formstoffpartikeln wirksam werdenden Staukräften andererseits einstellt. Die Fluidisierung führt zu einer Verminderung der Grenzflächenkräfte zwischen den Formstoffpartikeln untereinander wie auch zwischen diesen und dem Modell bzw. dem Formkasten und dem Fül lrahmen, so daß die auf das einzelne Formstoffpartikel von dem Gas oder von benachbarten Partikel n ausgeübten Impulskräfte zu einer dichteren Packung des Formstoffs führen.Final clarity could still be achieved 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 acting on the molding material particles on the other hand. The fluidization leads to a reduction in the interfacial forces between the molding material particles as well as 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 n result in a denser packing of the Lead 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, 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 will therefore usually 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 has to be stripped off after compression.
Der Erfindung I iegt 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 compression over the mold height can be achieved with a minimum requirement for molding material.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß auf die freie Formstoff-Oberfläche eine gasdurchlässige Zusatzmasse aufgelegt und daß der Gasdruck auf die freie Oberfläche der Zusatzmasse zur Wirkung gebracht wird.This object is achieved in that a gas-permeable additional mass is placed on the free surface of the molding material 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 Formstoffpartikeln, als auch an den gasundurchläs-. sigen Bereichen der Zusatzmasse wirksam, wobei letztere die ihr erteilten Impulskräfte an die Formstoffpartikel weitergibt. Wichtig ist dabei, daß die Zusatzmasse auf der freien Formstoff- Oberfläche aufliegt und nicht etwa freiliegend 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-PS 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-OS 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.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 ram forces responsible for the actual compression are impermeable both on the molding material particles and on the gas. sigen areas of the additional mass effective, the latter passes on the impulses given to the molding material particles. 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 an exposed 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 Pat. No. 2,830,339), practically like a compression piston, without the compression gas being able to penetrate into the bed of molding material. The same applies to another known proposal (DE-OS 29 49 340) in which the molding surface is completely or partially provided with a gas-impermeable cover in the context 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 femer 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 surface of the molding material is approximately uniformly flat, which is the case with the previously. does not achieve known methods. Due to the optimization of the molding material mass, the molding material supernatant that is necessary in many cases can also be better regulated and, above all, set at a lower height. For a given mold size and mold material filling and a certain degree of compression, the gas energy, i.e. reduce the gas pressure and / or the gas volume, so that there is in particular a reduction in the gas requirement. Finally, the method according to the invention can be carried out 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..Preferred additional measures such that the additional mass consists of several individual masses which are movable in the direction perpendicular to the molding material surface ensure that each individual mass can move in accordance with the impulse force imparted 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 tiefen Konturen.According to a further advantageous embodiment, it is provided that the additional mass has a distribution of the individual mass which is adapted to the contour of the model, such that the mass is lower over high model contours than over deep contours.
In bevorzugter Ausführung besteht die Zusatzmasse 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.In a preferred embodiment, the additional mass consists of particles of greater specific gravity 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.
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 diese 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 the entire surface of the molding material can be placed on top of it and can be lifted off from it 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 added to each working cycle of the device, e.g. a molding machine, placed on the molding material filled in the molding space, then brought the gas pressure wave into effect and after venting the molding space, the additional mass is removed from the compressed mold.
Die Zusatzmasse kann im einfachsten Fall von einem Lochblech, ist jedoch bei einer bevorzugten Ausführungsform der Vorrichtung von einem die Formstoff-Oberfläche zumindest teilweise abdeckenden Kissen gebildet, das aus einer Schüttung von Metallpartikeln und einem diese einschließenden Gewebe besteht. Bei den Metallpartikeln kann es sich beispielsweise um Granulat, Schrot od. dgl. handeln, während als Gewebe ein solches aus Kunststoff oder - im Falle einer Verdichtung durch Explosivkräfte mit entsprechender Temperaturentwicktung - aus Draht handeln kann.In the simplest case, the additional mass can consist of a perforated plate, but in a preferred embodiment of the device is formed by a cushion that at least partially covers the molding material surface and that consists of a bed of metal particles and a fabric that encloses them. The metal particles can be, for example, granules, shot or the like, while the woven fabric can be made of plastic or - in the case of compression by explosive forces with appropriate temperature development - made of wire.
Die solchermaßen aufgebaute Zusatzmasse ist zumindest begrenzt frei beweglich aufgehängt bzw. abgestütz, 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, on the other hand, can freely follow the forces acting on it.
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 dieses 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 model plate 1 with a
Beim dargestellten Ausführungsbeispiel ist an den Gassammelraum 5 über eine Leitung 8 ein Behälter 7 angeschlossen, in welchem entweder Druckgas gespeichert oder durch 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 exemplary embodiment shown, 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 hohen spezifischen Gewichtes, z.B. Metallgranulat, Metallschrot od.dgl..This device also includes an
Die Zusatzmasse 12 ist bei dem wiedergegebenen Ausführungsbeispiel über ein 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 Zugsei I 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
Claims (7)
dadurch gekennzeichnet, daß auf die gesamte freie Formstoff-Oberfläche eine gasdurchlässige Zusatzmasse aufgelegt und daß der Gasdruck auf die freie Oberfläche der Zusatzmasse zur Wirkung gebracht wird.1. Process 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,
characterized in that a gas-permeable additional mass is placed on the entire free molding material surface and that the gas pressure is brought into effect on the free surface of the additional mass.
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 true EP0089547A1 (en) | 1983-09-28 |
| EP0089547B1 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) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3417701A1 (en) * | 1983-06-02 | 1984-12-13 | Georg Fischer AG, Schaffhausen, CH, Niederlassung: Georg Fischer AG, 7700 Singen | Method and apparatus for compacting granular moulding materials |
| EP0131723A1 (en) * | 1983-06-18 | 1985-01-23 | BMD Badische Maschinenfabrik Durlach GmbH | Device for compacting foundry mould material by means of pressurized gas |
| EP0128336B1 (en) * | 1983-05-11 | 1988-03-30 | BMD Badische Maschinenfabrik Durlach GmbH | Device for compacting foundry sand |
| US5808336A (en) * | 1994-05-13 | 1998-09-15 | Canon Kabushiki Kaisha | Storage device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3659642A (en) * | 1969-12-05 | 1972-05-02 | Lev Fedorovich Vasilkovsky | Apparatus for compacting a moulding mixture |
| FR2443891A1 (en) * | 1978-12-15 | 1980-07-11 | Fischer Ag Georg | PROCESS FOR COMPACTING GRANULAR MATERIALS |
| GB2079654A (en) * | 1980-07-09 | 1982-01-27 | Sintokogio Ltd | Moulding method and apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JPS5722848A (en) * | 1980-07-12 | 1982-02-05 | Sintokogio Ltd | Method for making mold |
-
1983
- 1983-03-08 AT AT83102255T patent/ATE19973T1/en active
- 1983-03-08 EP EP83102255A patent/EP0089547B1/en not_active Expired
- 1983-03-08 DE DE8383102255T patent/DE3363683D1/en not_active Expired
- 1983-03-16 US US06/475,725 patent/US4538664A/en not_active Expired - Fee Related
- 1983-03-22 JP JP58046104A patent/JPS58173056A/en active Pending
- 1983-03-22 PL PL24113383A patent/PL241133A1/en unknown
- 1983-03-22 DD DD83249056A patent/DD207343A5/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3659642A (en) * | 1969-12-05 | 1972-05-02 | Lev Fedorovich Vasilkovsky | Apparatus for compacting a moulding mixture |
| FR2443891A1 (en) * | 1978-12-15 | 1980-07-11 | Fischer Ag Georg | PROCESS FOR COMPACTING GRANULAR MATERIALS |
| GB2079654A (en) * | 1980-07-09 | 1982-01-27 | Sintokogio Ltd | Moulding method and apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0128336B1 (en) * | 1983-05-11 | 1988-03-30 | BMD Badische Maschinenfabrik Durlach GmbH | Device for compacting foundry sand |
| DE3417701A1 (en) * | 1983-06-02 | 1984-12-13 | Georg Fischer AG, Schaffhausen, CH, Niederlassung: Georg Fischer AG, 7700 Singen | Method and apparatus for compacting granular moulding materials |
| EP0131723A1 (en) * | 1983-06-18 | 1985-01-23 | BMD Badische Maschinenfabrik Durlach GmbH | Device for compacting foundry mould material by means of pressurized gas |
| US5808336A (en) * | 1994-05-13 | 1998-09-15 | Canon Kabushiki Kaisha | Storage device |
| US6324101B1 (en) | 1994-05-13 | 2001-11-27 | Canon Kabushiki Kaisha | Storage method involving change of resistance state |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE19973T1 (en) | 1986-06-15 |
| US4538664A (en) | 1985-09-03 |
| JPS58173056A (en) | 1983-10-11 |
| DE3363683D1 (en) | 1986-07-03 |
| PL241133A1 (en) | 1984-01-02 |
| EP0089547B1 (en) | 1986-05-28 |
| DD207343A5 (en) | 1984-02-29 |
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