EP0086321A1 - 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
EP0086321A1
EP0086321A1 EP83100035A EP83100035A EP0086321A1 EP 0086321 A1 EP0086321 A1 EP 0086321A1 EP 83100035 A EP83100035 A EP 83100035A EP 83100035 A EP83100035 A EP 83100035A EP 0086321 A1 EP0086321 A1 EP 0086321A1
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EP
European Patent Office
Prior art keywords
abrasive
medium
sand cores
foam body
rigid foam
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83100035A
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German (de)
French (fr)
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EP0086321B1 (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
Application granted granted Critical
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 molded parts made from granular material, in particular sand cores.
  • deburr sand cores consisting of core sand and core binders, in particular for foundry purposes, by hand. They then receive their size coating by immersing them in an appropriate suspension. After the dipped sand cores have dried, the coating consisting of the size remains on the surface, which closes the large pores.
  • 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 grinding wheel medium to be returned to the vibrator.
  • the sand cores are deburred by the abrasive body medium.
  • the abrasive medium containing the sizing agent provides them with a uniform sizing coating at all points, which leads to the desired surface effect of the sand cores.
  • the abrasive body medium has a low specific weight. 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 medium is by continuously metered liquid addition, e.g. B. water to keep at the dust limit.
  • the mixture for carrying out the method preferably contains an abrasive body medium which is composed of approximately 30% of conical abrasive bodies and approximately 15% aluminum pins, loosened up by approximately 55% rigid polypropylene foam bodies.
  • 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.
  • the rigid foam bodies are cylindrical rods are formed and have a size comparable to that of the grinding wheels 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.
  • 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 associated with a water spraying device with nozzles directed towards the inside of the ring channel at the edge of the ring channel.
  • the nozzles are arranged in a uniform distribution, so that the abrasive body medium maintains the same degree of moisture near the dust limit over the entire length of the ring channel.
  • polypropylene as a rigid foam body in the approx. 50% addition to the vibrator abrasive medium proves to be advantageous.
  • a ring vibrator designated as a whole by 1.
  • This has a resiliently supported against a base frame 2, lying on a horizontal plane ring groove 3.
  • vibrations are transmitted to the ring groove 3, which cause the abrasive body medium 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.
  • the abrasive medium contained in the ring groove 3 and containing a sizing powder is composed of approximately 55% polypropylene rigid foam bodies 13, approximately 30% conical abrasive bodies 14 and approximately 15% aluminum pins 15.
  • 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 aforementioned rigid foam body 13 which is designed as a cylindrical rod, has a size comparable to that of the conical abrasive 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.
  • 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, the proportion of which makes up approximately 10% of the volume of the abrasive medium. 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 burrs that are still present on the sand cores 19 and are 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.
  • 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 7 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 annular gutter interior 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 Formteilen, insbesondere Sandkerne.The invention relates to a method for deburring molded parts made from granular material, in particular sand cores.

Es ist bekannt aus Kernsand und Kernbindemittel bestehende Sandkerne, insbesondere für Gießereizwecke, von Hand zu entgraten. Ihren Schlichteüberzug erhalten sie anschließend 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 geschlossen werden.It is known to deburr sand cores consisting of core sand and core binders, in particular for foundry purposes, by hand. They then receive their size coating by immersing them in an appropriate suspension. After the dipped sand cores have dried, the coating consisting of the size remains on the surface, which closes the large pores.

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 Sand kernen 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 Schleifkörpermediums 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. In the approx. 50% of the added hard foam body represents 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 grinding wheel medium to be returned to 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 provides them with 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, the abrasive body medium has a low specific weight. 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 Medium ist durch kontinuierlich dosierte Flüssigkeitszugabe, z. B. Wasser, an der Staubgrenze zu halten. Das Gemisch zur Durchführung des Verfahrens beinhaltet vorzugsweise ein Schleifkörpermedium, das sich zu ca. 30 % aus kegelförmigen Schleifkörpern und ca. 15 % Aluminiumstiften zusammensetzt, aufgelockert durch ca. 55 % Polypropylen-Hartschaumkörper.The medium is by continuously metered liquid addition, e.g. B. water to keep at the dust limit. The mixture for carrying out the method preferably contains an abrasive body medium which is composed of approximately 30% of conical abrasive bodies and approximately 15% aluminum pins, loosened up by approximately 55% rigid polypropylene foam bodies.

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 Schleifkörpermedium über die gesamte Ringrinnenlänge einen gleichen Feuchtigkeitsgrad nahe der Staubgrenze erhält. Schließlich erweist sich die Verwendung von Polypropylen als Hartschaumkörper in der ca. 50 %- igen Zugabe zum Vibrator-Schleifkörpermedium als vorteilhaft.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 can be achieved if the rigid foam bodies are cylindrical rods are formed and have a size comparable to that of the grinding wheels 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 associated with a water spraying device with nozzles directed towards the inside of the ring channel at the edge of the ring channel. The nozzles are arranged in a uniform distribution, so that the abrasive body medium maintains the same degree of moisture near the dust limit over the entire length of the ring channel. Finally, the use of polypropylene as a rigid foam body in the approx. 50% addition to the vibrator abrasive medium proves to be advantageous.

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

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

Bezüglich der 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, 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 ring groove 3. By means of a drive, not shown, vibrations are transmitted to the ring groove 3, which cause the abrasive body medium 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, ein Schlichtepulver enthaltende Schleifkörpermedium setzt sich aus ca. 55 % Polypropylen-Hartschaumkörpern 13, ca. 30 % kegelförmigen Schleifkörpern 14 und ca. 15 % Aluminiumstiften 15 zusammen.The abrasive medium contained in the ring groove 3 and containing a sizing powder is composed of approximately 55% polypropylene rigid foam bodies 13, approximately 30% conical abrasive bodies 14 and approximately 15% aluminum pins 15.

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 Schleifkörpern 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 body 13, which is designed as a cylindrical rod, has a size comparable to that of the conical abrasive 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, dessen Anteil etwa 10 % des Schleifkörpermedium-Volumens ausmacht. 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, the proportion of which makes up approximately 10% of the volume of the abrasive medium. 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 Sandkernen 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 that are still present on the sand cores 19 and are 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 7. 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 gutter 3, the contents of the container reach the separating sieve 7 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 annular gutter interior 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 the 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.

Alle in der Beschreibung erwähnten und in der Zeichnung dargestellten neuen Merkmale sind erfindungswesentlich, auch soweit sie in den Ansprüchen nicht ausdrücklich beansprucht sind.All the new features mentioned in the description and shown in the drawing are essential to the invention, even if they are not expressly claimed in the claims.

Claims (12)

1. Verfahren zum Entgraten von aus körnigem Material gefertigten Formteilen, insbesondere Sandkerne, dadurch gekennzeichnet, daß die Sandkerne (19) in einem an sich bekannten Gleitschliffvibrator (1) durch Umwälzen auf einer wendelförmigen Bahn entgratet werden und dem Schleifkörpermedium ein mit Bindemittel versetztes, pulverförmiges Überzugsmittel, insbesondere Schlichtungsmittel zugegeben ist.1. A process for deburring molded parts made of granular material, in particular sand cores, characterized in that the sand cores (19) are deburred by circulation on a helical path in a known vibratory grinding vibrator (1) and the abrasive body medium is mixed with a powdered binder Coating agent, especially sizing agent is added. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Schleifkörpermedium durch Hartschaumkörper (13) aufgelockert ist.2. The method according to claim 1, characterized in that the abrasive body medium is loosened by rigid foam body (13). 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der Anteil der Hartschaumkörper (13) am Schleifkörpermedium ca. 50 % beträgt.3. The method according to claim 2, characterized in that the proportion of hard foam body (13) in the abrasive medium is about 50%. 4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Hartschaumkörper -(13) als zylindrische Stäbchen ausgebildet sind.4. The method according to any one of the preceding claims, characterized in that the hard foam body - (13) are designed as cylindrical rods. 5. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß ein Teil des Schleifkörpermediums aus Aluminiumstiften (15) besteht.5. The method according to any one of the preceding claims, characterized in that a part of the abrasive body medium consists of aluminum pins (15). 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß der Anteil der Aluminiumstifte (15) an dem Schleifkörpermedium ca. 15 % beträgt.6. The method according to claim 5, characterized in that the proportion of aluminum pins (15) in the abrasive medium is approximately 15%. 7. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die als zylindrische Stäbchen ausgebildeten Polypropylen-Hartschaumkörper (13) eine gegenüber den Schleifkörpern (14) vergleichbare Größe besitzen, während die Größe der Aluminiumstifte (15) nur einen Bruchteil derselben beträgt.7. The method according to any one of the preceding claims, characterized in that the polypropylene rigid foam body (13) formed as a cylindrical rod have a size comparable to that of the abrasive bodies (14), while the size of the aluminum pins (15) is only a fraction thereof. 8. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß als Schlichtungsmittel eines der üblichen pulverförmigen Schlichtungsmittel, wie z. B. Graphit, Talkum, Aluminiumsilikat, und als Bindemittel ein fetthaltiger Stoff verwendet wird.8. The method according to any one of the preceding claims, characterized in that one of the usual powdered sizing agents, such as. As graphite, talc, aluminum silicate, and a fatty substance is used as a binder. 9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß das fetthaltige Bindemittel als flüssiger Stoff, z. B. Öl, zugegeben wird.9. The method according to claim 8, characterized in that the fat-containing binder as a liquid substance, for. B. oil is added. 10. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß das fetthaltige Bindemittel als pastöser Stoff, z. B. Wachs, zugegeben wird.10. The method according to claim 8, characterized in that the fatty binder as a pasty substance, for. B. wax, is added. 11. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Schleifkörpermedium durch kontinuierlich dosierte Zugabe von Feuchtigkeit an der Staubgrenze gehalten ist.11. The method according to claim 1, characterized in that the abrasive body medium is kept at the dust limit by continuously metered addition of moisture. 12. Verwendung eines Schlichtemittels als ca. 10 %-ige und Polypropylen-Hartschaumkörper als ca. 50 % Zugabe zu einem Vibrator-Schleifkörpermedium beim Entgraten von Sandkernen (19).12. Use of a sizing agent as an approx. 10% and polypropylene rigid foam body as an approx. 50% addition to a vibrator abrasive medium when deburring sand cores (19).
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)

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

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

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

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EP0140511A1 (en) * 1983-09-06 1985-05-08 B & U Corporation Method and apparatus for removing excess material from sand cores

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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
US4681600A (en) * 1984-09-05 1987-07-21 Extrude Hone Corporation Cutting tool fabrication process
JPH0421626Y2 (en) * 1987-02-06 1992-05-18
JPH0539804Y2 (en) * 1988-07-20 1993-10-08
US4956200A (en) * 1988-11-21 1990-09-11 The Burns & Russell Company Texturing a mold surface
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
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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Also Published As

Publication number Publication date
DE3360306D1 (en) 1985-08-01
JPS58209444A (en) 1983-12-06
ATE13985T1 (en) 1985-07-15
EP0086321B1 (en) 1985-06-26
DE3201284A1 (en) 1983-08-04
US4560586A (en) 1985-12-24
ES519074A0 (en) 1983-10-16
ES8308729A1 (en) 1983-10-16

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