EP0086321B1 - Method of deflashing cores produced by a grained material - Google Patents

Method of deflashing cores produced by a grained material Download PDF

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Publication number
EP0086321B1
EP0086321B1 EP83100035A EP83100035A EP0086321B1 EP 0086321 B1 EP0086321 B1 EP 0086321B1 EP 83100035 A EP83100035 A EP 83100035A EP 83100035 A EP83100035 A EP 83100035A EP 0086321 B1 EP0086321 B1 EP 0086321B1
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EP
European Patent Office
Prior art keywords
bodies
medium
grinding
sand cores
rigid foam
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Expired
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EP83100035A
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German (de)
French (fr)
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EP0086321A1 (en
Inventor
Karl Frech
Hans Tölle
Hartmut Lüdke
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Theodor Heimeier Metallwerk KG
Theodor Heimeier Metallwerk GmbH
Carl Kurt Walther GmbH and Co KG
Original Assignee
Theodor Heimeier Metallwerk KG
Theodor Heimeier Metallwerk GmbH
Carl Kurt Walther GmbH and Co KG
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Application filed by Theodor Heimeier Metallwerk KG, Theodor Heimeier Metallwerk GmbH, Carl Kurt Walther GmbH and Co KG filed Critical Theodor Heimeier Metallwerk KG
Priority to AT83100035T priority Critical patent/ATE13985T1/en
Publication of EP0086321A1 publication Critical patent/EP0086321A1/en
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Publication of EP0086321B1 publication Critical patent/EP0086321B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/18—Finishing

Definitions

  • the invention relates to a method for deburring sand cores made of granular material, in which the sand cores are freed of their orat by an abrasion process under the action of an abrasive medium.
  • DE-A-2 731 802 It is known from DE-A-2 731 802 to deburr sand cores consisting of core sand and core binders, in particular for foundry purposes, in a drum container containing granular scouring material. As is known, the deburred sand cores then receive a size coating by immersing them in a corresponding suspension. After the dipped sand cores have dried, the coating consisting of the size remains on the surface, as a result of which the large pores of the sand cores are closed.
  • the object of the invention is to provide a method of the type required, by means of which such molded parts can be deburred by machine at short notice and at the same time obtain such a size coating with no drying times.
  • the cores are accordingly supplied at one point of the ring vibrator and discharged at another, preferably using a discharge sieve which allows the abrasive body medium to be fed back into the vibrator.
  • the sand cores are deburred by the abrasive body medium.
  • the abrasive medium containing the sizing agent gives them a uniform sizing coating at all points, which leads to the desired surface effect of the sand cores.
  • Processing is preferably carried out with a large vibration amplitude.
  • the rigid foam bodies are designed in such a way that slight indentation is possible with a fingernail.
  • the abrasive body medium is through continuously metered addition of liquid, for. B. water, to keep at the dust limit and contains, in addition to the approximately 50% proportion of rigid foam bodies, about 15% aluminum pencils, conical grinding wheels and sizing powder.
  • the sand cores get an optimal coating with sizing powder if the sizing agent content is about 10% of the volume of the grinding media.
  • Particularly good embedding of the sand cores in the ring vibrator and optimal deburring are achieved if the hard foam bodies are designed as cylindrical rods and have a size comparable to that of the abrasive bodies and the size of the aluminum pins is only a fraction of the same.
  • the cylindrical rods have a diameter of approximately 8 mm with a total length of approximately 16-20 mm.
  • the end faces should preferably run obliquely to the longitudinal axis of the cylindrical rods.
  • the conical grinding wheels they are those with a base diameter of approx. 12 mm.
  • the aluminum pins on the other hand, have a diameter of 2 mm and are approx. 6 mm long.
  • the device for carrying out the method preferably consists in that a ring vibrator is assigned to the edge of the ring channel a water spray device which takes effect when dust is formed and has nozzles directed towards the ring channel interior.
  • the nozzles are arranged in a uniform distribution, so that the abrasive body medium receives an equal degree of moisture over the entire length of the ring channel near the dust limit.
  • a ring vibrator designated as a whole by 1.
  • This has a resiliently supported against a base frame 2, lying on a horizontal plane annular groove 3.
  • vibrations are transmitted to the annular groove 3, which cause the abrasive medium contained therein to circulate on a helical path.
  • a discharge channel 6, formed by container side walls 4, 5, extends in a secant-like orientation to the ring channel 3.
  • a discharge and separation device is accommodated in the latter.
  • the same has a removable, combined sieve separating box, the separating sieve 7 in the discharge position illustrated in FIG.
  • a water spray device 9 is assigned to the edge of the channel 3. Specifically, this has a tube 11, which is carried by means of holding brackets 10 and is adapted to the course of the ring gutter and is equipped with nozzles 12 directed towards the interior of the gutter.
  • the pipe 11 is connected to a water pipe, not shown.
  • the abrasive body medium located in the ring groove 3 is composed of approx. 50% rigid polypropylene foam bodies 13, approx. 25% conical abrasive bodies 14, approx. 15% aluminum pins 15 and approx. 10% size powder.
  • the polypropylene rigid foam body 13 are cylindrical in shape with a diameter x of approximately 8 mm. Their length y is approximately 16-20 mm.
  • the end faces 16 and 17 extend obliquely to the longitudinal axis of these cylindrical rods at an angle alpha of approximately 30 ° such that the end faces 16, 17 are arranged parallel to one another.
  • the base diameter z is approximately 12 mm.
  • the cone tip is slightly flattened, so that there is a total height h of the conical grinding wheels of approx. 13 mm.
  • the grinding bodies can form a fillet 18.
  • the aluminum pins 15 are also cylindrical. Their diameter u is 2 mm and their length v is approximately 6 mm.
  • the sizing agent is added. It preferably consists of a ground feldspar or mica, ie a potassium aluminum silicate, to which about 10% of powdered stearate has been added.
  • the water spray device 9 receives the impulse to supply water to the container contents via the nozzles 12 until the corresponding degree of moisture at the dust limit is reached.
  • the sand cores 19 do not damage one another because of the cushion formed by the polypropylene rigid foam bodies 13.
  • the sand cores 19 at the same time receive a size coating 20 consisting of sizing agent, which closes the pores of the sand core 19 and gives it a smooth surface.
  • the contents of the container reach the separating sieve 8 via the wall 8.
  • the sand cores 19 are discharged while the abrasive body medium plus sizing agent (insofar as it gets onto the sieve) falls through the separating sieve 7 and is thus fed back into the interior of the annular trough becomes.

Abstract

A process for the deburring of bonded moldings of granular material, for example, casting sand cores, coating them in the same operation with a surface layer. The moldings are circulated within an annular vibrator together with an abrasive body medium which contains a powdered coating agent, the medium being preferably deflocculated by an approximately 50% proportion of hard-foam bodies.

Description

Die Erfindung betrifft ein Verfahren zum Entgraten von aus körnigem Material gefertigten Sandkernen, bei dem die Sandkerne unter der Wikung eines Schleifkörpermediums durch einen Abriebvorgang von ihren Oraten befreit werden.The invention relates to a method for deburring sand cores made of granular material, in which the sand cores are freed of their orat by an abrasion process under the action of an abrasive medium.

Es ist aus der DE-A-2 731 802 bekannt, aus Kernsand und Kernbindemittel bestehende Sandkerne, insbesondere für Gießereizwecke, in ein granulatartiges Scheuergut enthaltenden Trommelbehältern zu entgraten. Einen Schlichteüberzug erhalten anschließend die entgrateten Sandkerne bekannterweise dadurch, daß sie in eine entsprechende Suspension eingetaucht werden. Nach Trocknen der getauchten Sandkerne verbleibt der aus der Schlichte bestehende Überzug an der Oberfläche, wodurch die großen Poren der Sandkerne geschlossen werden.It is known from DE-A-2 731 802 to deburr sand cores consisting of core sand and core binders, in particular for foundry purposes, in a drum container containing granular scouring material. As is known, the deburred sand cores then receive a size coating by immersing them in a corresponding suspension. After the dipped sand cores have dried, the coating consisting of the size remains on the surface, as a result of which the large pores of the sand cores are closed.

Aufgabe der Erfindung ist es, ein Verfahren der vorausgesetzten Art anzugeben, mittels welchem solche Formteile kurzfristig maschinell entgratet werden können und gleichzeitig einen solchen Schlichteüberzug erhalten unter Verzicht auf Trockenzeiten.The object of the invention is to provide a method of the type required, by means of which such molded parts can be deburred by machine at short notice and at the same time obtain such a size coating with no drying times.

Gelöst wird diese Aufgabe durch die im Hauptanspruch angegebene Erfindung. Die Unteransprüche stellen vorteilhafte Weiterbildungen dar.This object is achieved by the invention specified in the main claim. The subclaims represent advantageous developments.

Zufolge derartiger Ausgestaltung ist ein automatisch arbeitendes Verfahren zum Entgraten und Schlichteüberziehen von Formteilen, insbesondere geschossenen Sandkernen gegeben. Nach Fertigung der Kerne werden diese dem das Schlichtepulver und Schleifkörpermedium enthaltenden Vibrator, insbesondere Ringvibrator zugegeben. Dort wird der Behälterinhalt dann auf einer wendelförmigen Bahn umgewälzt. Die in ca. 50 %-igem Anteil beigefügten Hartschaum-Körper stellen ein Polster zwischen den einzelnen empfindlichen Sandkernen dar, so daß die Gefahr einer Beschädigung beseitigt ist. Der Einsatz des Ringvibrators führt zu dem Vorteil, daß während der Bearbeitung der Sandkerne keine Entmischung des Schleifkörpermediums stattfindet und daß demzufolge eine schonende Behandlung gegeben ist. Die Durchlaufzeit entspricht etwa 3-5 Minuten, vorzugsweise als ein einziger Umlauf. An einer Stelle des Ringvibrators werden die Kerne demgemäß zugeführt und an einer anderen ausgetragen, vorzugsweise unter Verwendung eines Austragsiebes, welches es erlaubt, daß das Schleifkörpermedium wieder in den Vibrator zurückgeführt wird. Während des Umlaufes der Sandkerne in dem Ringvibrator findet durch das Schleifkörpermedium eine Entgratung der Sandkerne statt. Gleichzeitig erhalten diese durch das das Schlichtemittel aufweisende Schleifkörpermedium einen an allen Stellen gleichmäßigen Schlichteüberzug, der zu dem angestrebten Oberflächeneffekt der Sandkerne führt. Insbesondere wegen des 50 %-igen Anteils der geschäumten Hartschaum-Körper liegt ein niedriges spezifisches Gewicht des Schleifkörpennedium vor. Vorzugsweise erfolgt die Bearbeitung bei großer Schwingungsamplitude. Die Hartschaum-Körper sind so beschaffen, daß mit einem Fingernagel ein geringes Eindrücken ermöglicht ist.As a result of such a configuration, there is an automatically operating method for deburring and finishing coating molded parts, in particular shot sand cores. After the cores have been produced, they are added to the vibrator, in particular the ring vibrator, containing the sizing powder and abrasive medium. The contents of the container are then circulated on a helical path. The hard foam bodies added in approx. 50% share represent a cushion between the individual sensitive sand cores, so that the risk of damage is eliminated. The use of the ring vibrator has the advantage that there is no separation of the abrasive body medium during the processing of the sand cores and that consequently a gentle treatment is given. The lead time corresponds to about 3-5 minutes, preferably as a single pass. The cores are accordingly supplied at one point of the ring vibrator and discharged at another, preferably using a discharge sieve which allows the abrasive body medium to be fed back into the vibrator. During the circulation of the sand cores in the ring vibrator, the sand cores are deburred by the abrasive body medium. At the same time, the abrasive medium containing the sizing agent gives them a uniform sizing coating at all points, which leads to the desired surface effect of the sand cores. In particular because of the 50% share of the foamed rigid foam body, there is a low specific weight of the abrasive medium. Processing is preferably carried out with a large vibration amplitude. The rigid foam bodies are designed in such a way that slight indentation is possible with a fingernail.

Das Schleifkörpermedium ist durch kontinuierlich dosierte Flüssigkeitszugabe, z. B. Wasser, an der Staubgrenze zu halten und beinhaltet neben den in ca. 50 %-igem Anteil zugegebenen Hartschaumkörpern ca. 15 % Aluminiumstifte, Kegelförmige Schleifkörper und Schlichtepulver. Einen optimalen Überzug mit Schlichtepulver erhalten die Sandkerne dadurch, wenn der Schlichtemittel-Anteil etwa 10 % des Schleifkörpermedium-Volumens beträgt. Eine besonders gute Einbettung der Sandkerne in dem Ringvibrator und eine optimale Entgratung werden erreicht, wenn die Hartschaumkörper als zylindrische Stäbchen ausgebildet sind und eine gegenüber den Schleifkörpern vergleichbare Größe besitzen und die Größe der Aluminiumstifte nur einen Bruchteil derselben beträgt. In Zahlen ausgedrückt bedeutet dieses bspw., daß die zylindrischen Stäbchen einen Durchmesser von ca. 8 mm aufweisen bei einer Gesamtlänge von etwa 16-20 mm. Vorzugsweise sollen dabei die stirnflächen schräg zur Längsachse der zylindrischen Stäbchen verlaufen. Bezüglich der kegelförmigen Schleifkörper handelt es sich um solche mit einem Basisdurchmesser von ca. 12 mm. Die Aluminiumstifte haben dagegen einen Durchmesser von 2 mm und sind ca. 6 mm lang. Die Vorrichtung zur Durchführung des Verfahrens besteht vorzugsweise darin, daß einem Ringvibrator randseitig der Ringrinne eine bei Staubbildung in Wirkung tretende Wasser-Sprüheinrichtung mit auf den Ringrinnen-Innenraum gerichteten Düsen zugeordnet ist. Die Düsen sind in gleichmäßiger Verteilung angeordnet, so daß das Schleifkörpermedlum über die gesamte Ringrinnenlänge einen gleichen Feuchtigkeitsgrad nahe der Straubgrenze erhält.The abrasive body medium is through continuously metered addition of liquid, for. B. water, to keep at the dust limit and contains, in addition to the approximately 50% proportion of rigid foam bodies, about 15% aluminum pencils, conical grinding wheels and sizing powder. The sand cores get an optimal coating with sizing powder if the sizing agent content is about 10% of the volume of the grinding media. Particularly good embedding of the sand cores in the ring vibrator and optimal deburring are achieved if the hard foam bodies are designed as cylindrical rods and have a size comparable to that of the abrasive bodies and the size of the aluminum pins is only a fraction of the same. Expressed in numbers, this means, for example, that the cylindrical rods have a diameter of approximately 8 mm with a total length of approximately 16-20 mm. The end faces should preferably run obliquely to the longitudinal axis of the cylindrical rods. With regard to the conical grinding wheels, they are those with a base diameter of approx. 12 mm. The aluminum pins, on the other hand, have a diameter of 2 mm and are approx. 6 mm long. The device for carrying out the method preferably consists in that a ring vibrator is assigned to the edge of the ring channel a water spray device which takes effect when dust is formed and has nozzles directed towards the ring channel interior. The nozzles are arranged in a uniform distribution, so that the abrasive body medium receives an equal degree of moisture over the entire length of the ring channel near the dust limit.

Nachstehend wird das Verfahren und ein Ausführungsbeispiel einer Vorrichtung zur Durchführung des Verfahrens anhand der Fig. 1-8 erläutert. Es zeigt

  • Figur 1 einen bereits entgrateten und mit einem Schlichteüberzug versehenen Sandkern normaler Größe in Ansicht,
  • Figur 2 in stark vergrößerter Darstellung den Schnitt nach der Linie 11-11 in Fig. 1,
  • Figur 3 in natürlicher Größe in Ansicht und Draufsicht einen Polypropylen-Hartschaumkörper, einen kegelförmigen Schleifkörper und einen Aluminiumstift,
  • Figur 4 in stark vergrößerter Darstellung einen Längsschnitt durch einen Polypropylen-Hartschaumkörper,
  • Figur 5 einen kegelförmigen Schleifkörper im Längsschnitt, ebenfalls stark vergrößert,
  • Figur 6 in stark vergrößerter Darstellung einen Längsschnitt durch einen Aluminiumstift,
  • Figur 7 eine Ansicht der Vorrichtung zur Durchführung des Verfahrens, teilweise aufgebrochen und
  • Figur 8 eine Draufsicht auf die Vorrichtung zur Durchführung des Verfahrens.
The method and an exemplary embodiment of an apparatus for carrying out the method are explained below with reference to FIGS. 1-8. It shows
  • FIG. 1 shows a sand core of normal size already deburred and provided with a size coating,
  • FIG. 2 shows the section along the line 11-11 in FIG. 1 in a greatly enlarged illustration,
  • FIG. 3 in natural size in view and top view of a polypropylene rigid foam body, a conical abrasive body and an aluminum pin,
  • FIG. 4 shows a greatly enlarged illustration of a longitudinal section through a polypropylene rigid foam body,
  • FIG. 5 shows a conical grinding body in longitudinal section, likewise greatly enlarged,
  • FIG. 6 shows a greatly enlarged illustration of a longitudinal section through an aluminum pin,
  • Figure 7 is a view of the device for performing the method, partially broken away and
  • Figure 8 is a plan view of the device for performing the method.

Bezüglich der nicht zum Gegenstand der Erfindung gehörenden Vorrichtung zur Durchführung des Verfahrens handelt es sich um einen als Ganzes mit 1 bezeichneten Ringvibrator. Dieser besitzt eine gegenüber einem Fußgestell 2 federnd abgestützte, auf einer horizontalen Ebene liegende Ringrinne 3. Mittels eines nicht dargestellten Antriebes werden Vibrationen auf die Ringrinne 3 übertragen, die bewirken, daß das darin befindliche Schleifkörpermedium sich auf einer wendelförmigen Bahn umwälzt. In sekantenartiger Ausrichtung zur Ringrinne 3 erstreckt sich ein von Behälter-Seitenwänden 4, 5 gebildeter Austragskanal 6. In letzterem ist eine Austrags- und Trenneinrichtung untergebracht. Dieselbe besitzt einen herausnehmbaren, kombinierten Siebtrennkasten, dessen Trennsieb 7 in der in Fig. 7 veranschaulichten Austragsstellung mit einer abgewinkelten, der Förderrichtung W zugekehrten Auflauffläche 7' auf einen vom Rinnenboden ausgehenden Wall 8 aufsetzt. Der Ringrinne 3 ist randseitig eine Wasser-Sprüheinrichtung 9 zugeordnet. Im einzelnen weist diese ein mittels Haltewinkeln 10 getragenes, dem Ringrinnenverlauf angepaßtes Rohr 11 auf, welches mit auf den Ringrinnen-Innenraum gerichteten Düsen 12 ausgestattet ist. Das Rohr 11 ist an eine nicht dargestellte Wasserleitung angeschlossen.With regard to the device for carrying out the method, which is not part of the subject matter of the invention, it is a ring vibrator designated as a whole by 1. This has a resiliently supported against a base frame 2, lying on a horizontal plane annular groove 3. By means of a drive, not shown, vibrations are transmitted to the annular groove 3, which cause the abrasive medium contained therein to circulate on a helical path. A discharge channel 6, formed by container side walls 4, 5, extends in a secant-like orientation to the ring channel 3. A discharge and separation device is accommodated in the latter. The same has a removable, combined sieve separating box, the separating sieve 7 in the discharge position illustrated in FIG. 7 with an angled, facing the conveying direction W contact surface 7 'on a wall 8 starting from the channel bottom. A water spray device 9 is assigned to the edge of the channel 3. Specifically, this has a tube 11, which is carried by means of holding brackets 10 and is adapted to the course of the ring gutter and is equipped with nozzles 12 directed towards the interior of the gutter. The pipe 11 is connected to a water pipe, not shown.

Das in der Ringrinne 3 befindliche Schleifkörpermedium setzt sich aus ca. 50 % Polypropylen-Hartschaumkörpern 13, ca. 25 % kegelförmigen Schleifkörpern 14, ca. 15 % Aluminiumstiften 15 und ca. 10% Schlichtepulver zusammen.The abrasive body medium located in the ring groove 3 is composed of approx. 50% rigid polypropylene foam bodies 13, approx. 25% conical abrasive bodies 14, approx. 15% aluminum pins 15 and approx. 10% size powder.

Die Polypropylen-Hartschaumkörper 13 sind zylindrisch geformt mit einem Durchmesser x von ca. 8 mm. Deren Länge y beträgt etwa 16-20 mm. Die Stirnflächen 16 und 17 verlaufen dabei schräg gerichtet zur Längsachse dieser zylindrischen Stäbchen unter einem Winkel alpha von ca. 30° derart, daß die Stirnflächen 16, 17 parallel zueinander angeordnet sind.The polypropylene rigid foam body 13 are cylindrical in shape with a diameter x of approximately 8 mm. Their length y is approximately 16-20 mm. The end faces 16 and 17 extend obliquely to the longitudinal axis of these cylindrical rods at an angle alpha of approximately 30 ° such that the end faces 16, 17 are arranged parallel to one another.

Vorgenannte, als zylindrische Stäbchen ausgebildete Hartschaumkörper 13 weisen eine gegenüber den kegelförmigen Schteifkörpern 14 vergleichbare Größe auf. Der Basisdurchmesser z derselben beträgt ca. 12 mm. Die Kegelspitze ist leicht abgeflacht, so daß eine Gesamthöhe h der kegelförmigen Schleifkörper von ca. 13 mm vorliegt. Basisseitig können die Schleifkörper eine Hohlkehle 18 ausbilden.The aforementioned rigid foam bodies 13, which are designed as cylindrical rods, have a size that is comparable to that of the conical shaving bodies 14. The base diameter z is approximately 12 mm. The cone tip is slightly flattened, so that there is a total height h of the conical grinding wheels of approx. 13 mm. On the base side, the grinding bodies can form a fillet 18.

Die Aluminiumstifte 15 sind ebenfalls zylindrisch gestaltet. Deren Durchmesser u beträgt 2 mm und deren Länge v ca. 6 mm.The aluminum pins 15 are also cylindrical. Their diameter u is 2 mm and their length v is approximately 6 mm.

Nach Füllen der Ringrinne 3 mit dem Schleifkörpermedium erfolgt die Zugabe des Schlichtemittels. Es besteht vorzugsweise aus einem gemahlenen Feldspat oder auch Glimmer, also einem Kaliumaluminiumsilikat, dem etwa 10 % pulverisiertes Stearat zugemischt ist.After the ring channel 3 has been filled with the abrasive medium, the sizing agent is added. It preferably consists of a ground feldspar or mica, ie a potassium aluminum silicate, to which about 10% of powdered stearate has been added.

Ist nun die Ringrinne 3 gefüllt und in Schwingungen versetzt, wälzt sich der Behälterinhalt auf einer wendelförmigen Bahn in Richtung w der Ringrinne um. Über ein nicht dargestelltes Gerät erhält die Wasser-Sprüheinrichtung 9 den Impuls, über die Düsen 12 dem Behälterinhalt Wasser zuzuführen, bis der entsprechende an der Staubgrenze liegende Feuchtigkeitsgrad erreicht ist.If the ring trough 3 is now filled and vibrated, the contents of the container roll on a helical path in the direction w of the ring trough. Via a device, not shown, the water spray device 9 receives the impulse to supply water to the container contents via the nozzles 12 until the corresponding degree of moisture at the dust limit is reached.

Die mittels geeigneter Maschinen geschossenen, aus Kernsand S und Kernbindemittel bestehenden Sandkerne 19 können nun im dem Trennsieb benachbarten Bereich der Ringrinne dem Schleifkörpermedium zugegeben werden, so daß die Sandkerne 19 zusammen mit dem Schleifkörpermedium auf der wendelförmigen Bahn sich umwälzen. Dabei werden die an den Sand kernen 19 noch vorhandenen, nicht dargestellten Grate abgetragen. Der Abtrag erweist sich nicht als schädlich. Die Sandkerne 19 beschädigen sich wegen des von den Polypropylen-Hartschaumkörpern 13 gebildeten Polsters gegenseitig nicht. Während dieser Umwälzbewegung erhalten die Sandkerne 19 gleichzeitig einen aus Schlichtemittel bestehenden Schlichteüberzug 20, der die Poren des Sandkerns 19 schließt und diesem eine glatte Oberfläche verleiht.The sand cores 19, which are shot by means of suitable machines and consist of core sand S and core binder, can now be added to the abrasive body medium in the region of the ring groove adjacent to the separating sieve, so that the sand cores 19 circulate on the helical path together with the abrasive body medium. The burrs still present on the sand cores 19, not shown, are removed. The removal does not prove to be harmful. The sand cores 19 do not damage one another because of the cushion formed by the polypropylene rigid foam bodies 13. During this circulation movement, the sand cores 19 at the same time receive a size coating 20 consisting of sizing agent, which closes the pores of the sand core 19 and gives it a smooth surface.

Nach Umlauf innerhalb der Ringrinne 3 gelangt der Behälterinhalt über den Wall 8 auf das Trennsieb 8. Die Sandkerne 19 werden ausgetragen, während das Schleifkörpermedium plus Schlichtemittel (soweit es auf das Sieb gelangt) durch das Trennsieb 7 fällt und so dem Ringrinnen-Innenraum wieder zugeführt wird.After circulation within the ring trough 3, the contents of the container reach the separating sieve 8 via the wall 8. The sand cores 19 are discharged while the abrasive body medium plus sizing agent (insofar as it gets onto the sieve) falls through the separating sieve 7 and is thus fed back into the interior of the annular trough becomes.

Es braucht sich nicht um Sandkerne für die Gießereitechnik zu handeln, sondern es können z. B. auch gebundene Formteile aus Porzellan entgratet und gleichzeitig mit einem als Pulver zugegebenen Lack überzogen werden.It does not need to be sand cores for foundry technology, but it can e.g. B. also deburred bound molded parts made of porcelain and at the same time coated with a powder added paint.

Claims (11)

1. A method of deburring sand cores manufactured from granular material, in which the sand cores are freed of their burrs under the action of a grinding-bodies medium by a process of abrasion, characterized in that the process of abrasion is performed in a vibratory grinder (1) known in itself in which the sand cores (19) get rolled round along a helical path and that to the grinding-bodies medium is added a powdery coating- medium, in particular a sizing-medium, mixed with a binder.
2. A method as in Claim 1, characterized in that the grinding-bodies medium is loosened up by rigid foam bodies (13).
3. A method as in Claim 2, characterized in that the proportion of rigid foam bodies (13) to the grinding-bodies medium amounts to about 50 %.
4. A method as in one of the preceding Claims, characterized in that the rigid foam bodies (13) are made as little cylindrical rods.
5. A method as in one of the preceding Claims, characterized in that part of the grinding-bodies medium consists of aluminium pins (15).
6. A method as in Claim 5, characterized in that the proportion of aluminium pins (15) to the grinding-bodies medium amounts to about 15 %.
7. A method as in one of the preceding Claims, characterized in that the rigid foam bodies (13) made as little cylindrical rods consist of polypropylene and have a size comparable with the grinding-bodies (14), whilst the size of the aluminium pins (15) amounts to only a fraction of that of the grinding-bodies.
8. A method as in one of the preceding Claims, characterized in that a powdery sizing medium like, e.g., graphite, talcum or aluminium silicate is employed and that as binder a fatty substance is employed.
9. A method as in Claim 8, characterized in that the fatty binder is added as a liquid substance, e.g., oil.
10. A method as in Claim 8, characterized in that the fatty binder is added as a pasty substance, e.g., wax.
11. A method as in Claim 1, characterized in that the grinding-bodies medium is kept at the dust boundary by the continuous addition of moisture in measured quantities.
EP83100035A 1982-01-18 1983-01-04 Method of deflashing cores produced by a grained material Expired EP0086321B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100035T ATE13985T1 (en) 1982-01-18 1983-01-04 PROCESS FOR DEBURRING SAND CORE MADE FROM GRANULAR MATERIAL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3201284 1982-01-18
DE19823201284 DE3201284A1 (en) 1982-01-18 1982-01-18 METHOD FOR DEBURRING AND SURFACE COVERING OF CLOSED CASTING CORES

Publications (2)

Publication Number Publication Date
EP0086321A1 EP0086321A1 (en) 1983-08-24
EP0086321B1 true EP0086321B1 (en) 1985-06-26

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Family Applications (1)

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EP83100035A Expired EP0086321B1 (en) 1982-01-18 1983-01-04 Method of deflashing cores produced by a grained material

Country Status (6)

Country Link
US (1) US4560586A (en)
EP (1) EP0086321B1 (en)
JP (1) JPS58209444A (en)
AT (1) ATE13985T1 (en)
DE (2) DE3201284A1 (en)
ES (1) ES8308729A1 (en)

Cited By (2)

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DE4005824C1 (en) * 1990-02-23 1991-03-07 Theodor Heimeier Metallwerk Kg, 4782 Erwitte, De Method of deburring foundry cores - has cores placed in ring vibrator and grinding bodies added to these
DE4019433C1 (en) * 1990-06-19 1991-08-29 Theodor Heimeier Metallwerk Kg, 4782 Erwitte, De Removal of flash and application of wash coating to foundry cores - comprising circulating cores in ring vibrator to which grinding medium contg. two types of grinding body is added

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DE3322567C2 (en) * 1983-06-23 1985-05-23 Georg Fischer GmbH, 4020 Mettmann Device for deburring workpieces designed as foundry cores or the like
CA1214916A (en) * 1983-09-06 1986-12-09 Udo Kuehn Method and apparatus for removing excess material from sand cores
US4681600A (en) * 1984-09-05 1987-07-21 Extrude Hone Corporation Cutting tool fabrication process
JPH0421626Y2 (en) * 1987-02-06 1992-05-18
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US4956200A (en) * 1988-11-21 1990-09-11 The Burns & Russell Company Texturing a mold surface
US5814161A (en) * 1992-11-30 1998-09-29 Massachusetts Institute Of Technology Ceramic mold finishing techniques for removing powder
CN104550711A (en) * 2014-12-17 2015-04-29 江苏凌特精密机械有限公司 Process for manufacturing vibrating ring
CN112756561B (en) * 2020-11-25 2022-10-04 昆山中超自动化有限公司 Beat sand core unhairing limit equipment

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Publication number Priority date Publication date Assignee Title
DE4005824C1 (en) * 1990-02-23 1991-03-07 Theodor Heimeier Metallwerk Kg, 4782 Erwitte, De Method of deburring foundry cores - has cores placed in ring vibrator and grinding bodies added to these
DE4019433C1 (en) * 1990-06-19 1991-08-29 Theodor Heimeier Metallwerk Kg, 4782 Erwitte, De Removal of flash and application of wash coating to foundry cores - comprising circulating cores in ring vibrator to which grinding medium contg. two types of grinding body is added

Also Published As

Publication number Publication date
DE3360306D1 (en) 1985-08-01
JPS58209444A (en) 1983-12-06
EP0086321A1 (en) 1983-08-24
ATE13985T1 (en) 1985-07-15
DE3201284A1 (en) 1983-08-04
US4560586A (en) 1985-12-24
ES519074A0 (en) 1983-10-16
ES8308729A1 (en) 1983-10-16

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