EP0257318B1 - Device for accelerating ferromagnetic granular abrasives - Google Patents

Device for accelerating ferromagnetic granular abrasives Download PDF

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Publication number
EP0257318B1
EP0257318B1 EP87110804A EP87110804A EP0257318B1 EP 0257318 B1 EP0257318 B1 EP 0257318B1 EP 87110804 A EP87110804 A EP 87110804A EP 87110804 A EP87110804 A EP 87110804A EP 0257318 B1 EP0257318 B1 EP 0257318B1
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EP
European Patent Office
Prior art keywords
rotor
magnet
blasting medium
area
adjustable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87110804A
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German (de)
French (fr)
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EP0257318A2 (en
EP0257318A3 (en
Inventor
Gerd Prof. Dr.-Ing. Stange
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALFRED GUTMANN GESELLSCHAFT FUER MASCHINENBAU MBH
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Alfred Gutmann Gesellschaft fur Maschinenbau Mbh
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Publication of EP0257318A2 publication Critical patent/EP0257318A2/en
Publication of EP0257318A3 publication Critical patent/EP0257318A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/08—Devices for generating abrasive blasts non-mechanically, e.g. of metallic abrasives by means of a magnetic field or by detonating cords

Definitions

  • the invention relates to a device according to the preamble of patent claim 1.
  • DE-A-2 241 506 a device according to the preamble of claim 1 is known.
  • This device is provided with a permanent magnet inside the rotor, the rotor being made of non-ferromagnetic material.
  • the invention is based on the object of creating a device of the type mentioned at the outset which can also be used in practice, ie ensures a correspondingly high acceleration of the blasting medium and a corresponding influencing and control of the blasting medium beam.
  • the rotor consists essentially of soft magnetic material in order to ensure a correspondingly favorable guidance of the magnetic flux.
  • the formation of harmful eddy currents is prevented by the lamella structure.
  • the intermediate rings made of non-magnetizable material between the lamellae made of soft magnetic material ensure that the magnetic flux from the sharp edges of the soft magnetic material passes into the exterior where it is intended to exert the desired force.
  • the soft magnetic material is roughened on the outside (claim 2). This is advantageously done with a firmly adhering layer of granular material with a particularly high saturation induction (claim 3).
  • This material is e.g. Cobalt steel shot.
  • the roughness of the rotor surface favors the adhesion of the ferromagnetic abrasive in this area of the surface for the correspondingly effective acceleration.
  • the blasting agent which is supplied in known devices only by gravity with the aid of a funnel or the like, can advantageously be pre-accelerated, as stated in claims 4 and 5. This means that the speed difference between the impact speed and the peripheral speed of the rotor and the associated friction losses are reduced.
  • the field gradient generated by the magnetic pre-acceleration points as precisely as possible in the direction of the tangent to the rotor at the point of impact and thus brings about the best possible pre-acceleration.
  • the direction of the tangent in the desired manner can be influenced by the adjustment of the permanent or electromagnet.
  • the device can be constructed as specified in claim 9.
  • the device shown in the drawing consists of a rotor 1 and a magnet arrangement 3 arranged therein, comprising individual sectors 2 made of permanent magnetic material.
  • the magnet arrangement normally extends over an angular range of 90 to 270 °. It lies close to the inner surface of the rotor 1 and generates a corresponding magnetic field. This reaches over the air gap 4 through the rotor surface into the space outside the surface. It is thus able to exert forces on ferromagnetic particles directed perpendicular to the outer surface of the rotor and to bind them to the surface against the action of the centrifugal forces. In order to make good use of the force of the magnetic field, the air gap must be kept as small as possible.
  • the rotor 1 consists of lamellae 5 made of soft magnetic material, which take over the task of guiding the magnetic flux.
  • the lamellar structure prevents the formation of harmful eddy currents.
  • the areas of soft magnetic material covering one pole of the permanent magnetic sectors 2 are separated by intermediate rings 6 made of non-magnetizable material. As a result, the magnetic flux passes from the sharp edges of the soft magnetic material into the outside space where it should develop the desired force.
  • the lamellae 5 are provided on the outside with a rough surface, which can consist of a firmly adhering layer 7 made of granular material with a particularly high saturation induction (eg shot from cobalt steel).
  • a rough surface which can consist of a firmly adhering layer 7 made of granular material with a particularly high saturation induction (eg shot from cobalt steel).
  • the roughness of the rotor surface leads to better adhesion of the ferromagnetic abrasive in this area and thus promotes acceleration.
  • the feed device for the tangential feed of the blasting medium is designated by 8. It consists of a permanent or electromagnet 9 that can be adjusted in two directions and a magnetic yoke 10. This results in a targeted return of the magnetic flux generated by the magnet 9 via the part of the rotor 1 and the air gap 11.
  • the abrasive is pre-accelerated, with the generated field gradient pointing exactly in the direction of the tangent to the rotor at the point of impact. There is an acceleration from the speed V0 to the starting speed of V start , which is in the range of 25 m / s.
  • the magnet arrangement 3 has individual magnetic webs or disks 12 which can be adjusted by rotation relative to the corresponding, adjacent, fixed magnetic webs or disks. This can also be done by group-wise adjustment of the magnetic webs or disks with a specific magnetization direction. In this way, the discharge point for part of the blasting medium is shifted on the circumference and a larger resulting scatter width is obtained for the entire beam, i.e. a fan is created so that a correspondingly large surface can be irradiated. The angle that the fan describes can also be adjusted to adapt to the various workpieces.
  • FIG. 3 shows an embodiment in which two devices according to the invention are connected in series if a particularly high ejection speed is desired or if one device is not sufficient for acceleration for certain design reasons.
  • the permanent magnetic systems 16 each extend over 180 °.
  • the drop point of the first device 13 is the transfer point for the second device 14, ie the entrance area of this device.
  • the two devices are thus complementary to each other.
  • FIG. 4 is particularly advantageous if a wider rotor arrangement (axially longer) with wider soft iron rings is provided. It can be seen that the magnet arrangement 3 from the sectors 2 is constructed differently in the middle region. The middle sector is divided so that two sectors with the same polar direction lie side by side. Each middle sector lies on the edge of the associated lamella 5 made of soft magnetic material.
  • the magnetic flux of the sector 2 located at the very top travels in the shortest possible way via the intermediate ring 6 made of non-magnetizable material into the “divided” sector 2 below.
  • the division of the middle sector into two sectors with the same pole direction is - as I said - only for the middle area. If the rotor arrangement is correspondingly wider, a corresponding number of sectors with alternating pole directions can be provided in a corresponding manner on the outside.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Description

Die Erfindung betrifft eine Vorrichtung nach dem Oberbegriff des Patentanspruches 1.The invention relates to a device according to the preamble of patent claim 1.

Aus der DE-A-2 241 506 ist eine Vorrichtung nach dem Oberbegriff des Patentanspruches 1 bekannt. Diese Vorrichtung ist mit einem Permanentmagneten im Inneren des Rotors versehen, wobei der Rotor aus nicht-ferromagnetischem Material besteht.From DE-A-2 241 506 a device according to the preamble of claim 1 is known. This device is provided with a permanent magnet inside the rotor, the rotor being made of non-ferromagnetic material.

In der Praxis konnten sich derartige Vorrichtungen zur magnetischen Beschleunigung von Strahlmittel bisher nicht durchsetzen, da die Beschleunigung und die Beeinflussung des Strahlmittels für die praktischen Anforderungen nicht ausreichend war.In practice, devices of this type for magnetic acceleration of blasting media have so far not been able to establish themselves, since the acceleration and the influencing of the blasting media were not sufficient for the practical requirements.

Der Erfindung liegt nun die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art zu schaffen, die auch in der Praxis einsetzbar ist, d.h. für eine entsprechend hohe Beschleunigung des Strahlmittels und für eine entsprechende Beeinflussung und Steuerung des Strahlmittelstrahles sorgt.The invention is based on the object of creating a device of the type mentioned at the outset which can also be used in practice, ie ensures a correspondingly high acceleration of the blasting medium and a corresponding influencing and control of the blasting medium beam.

Diese Aufgabe wird grundsätzlich durch die Merkmale des Anspruches 1 gelöst.This object is basically achieved by the features of claim 1.

Erfindungsgemäß besteht der Rotor im wesentlichen aus weichmagnetischem Material, um für eine entsprechend günstige Führung des magnetischen Flusses zu sorgen. Durch die Lamellenstruktur wird die Ausbildung schädlicher Wirbelströme verhindert. Die Zwischenringe aus nichtmagnetisierbarem Material zwischen den Lamellen aus weichmagnetischem Material stellen sicher, daß der magnetische Fluß aus den scharfen Kanten des weichmagnetischen Materials dort in den Außenraum übertritt, wo er die gewünschte Kraftwirkung entfalten soll.According to the invention, the rotor consists essentially of soft magnetic material in order to ensure a correspondingly favorable guidance of the magnetic flux. The formation of harmful eddy currents is prevented by the lamella structure. The intermediate rings made of non-magnetizable material between the lamellae made of soft magnetic material ensure that the magnetic flux from the sharp edges of the soft magnetic material passes into the exterior where it is intended to exert the desired force.

Um den für die Kraftwirkung entscheidenden Gradienten des magnetischen Feldes noch weiter zu erhöhen, wird das weichmagnetische Material außen aufgerauht (Anspruch 2). Dieses geschieht in vorteilhafter Weise mit einer festhaftenden Schicht aus körnigem Material mit besonders hoher Sättigungsinduktion (Anspruch 3). Dieses Material ist z.B. Schrot aus Kobaltstahl. Durch die Rauhigkeit der Rotoroberfläche wird die Haftung des ferromagnetischen Strahlmittels in diesem Bereich der Oberfläche zur entsprechend wirksamen Beschleunigung begünstigt.In order to further increase the gradient of the magnetic field, which is decisive for the force effect, the soft magnetic material is roughened on the outside (claim 2). This is advantageously done with a firmly adhering layer of granular material with a particularly high saturation induction (claim 3). This material is e.g. Cobalt steel shot. The roughness of the rotor surface favors the adhesion of the ferromagnetic abrasive in this area of the surface for the correspondingly effective acceleration.

Das Strahlmittel, das bei bekannten Vorrichtungen lediglich durch Schwerkraft mit Hilfe eines Trichters oder dergl. zugeführt wird, kann in vorteilhafter Weise, so wie in den Ansprüchen 4 und 5 angegeben, vorbeschleunigt werden. Das heißt, die Geschwindigkeitsdifferenz zwischen Auftreffgeschwindigkeit und Umfangsgeschwindigkeit des Rotors und die damit verbundenen Reibungsverluste werden vermindert. Der durch die magnetische Vorbeschleunigung erzeugte Feldgradient weist möglichst genau in Richtung der Tangente an dem Rotor im Auftreffpunkt und bewirkt so eine möglichst gute Vorbeschleunigung. Die Richtung der Tangente in der gewünschten Weise kann durch die Verstellung des Permanent-oder Elektromagneten beeinflußt werden.The blasting agent, which is supplied in known devices only by gravity with the aid of a funnel or the like, can advantageously be pre-accelerated, as stated in claims 4 and 5. This means that the speed difference between the impact speed and the peripheral speed of the rotor and the associated friction losses are reduced. The field gradient generated by the magnetic pre-acceleration points as precisely as possible in the direction of the tangent to the rotor at the point of impact and thus brings about the best possible pre-acceleration. The direction of the tangent in the desired manner can be influenced by the adjustment of the permanent or electromagnet.

In vielen Anwendungsfällen ist es wünschenswert, im Abwurfbereich des Strahlmittels einen Fächer für das Strahlmittel zu erzeugen, um so eine entsprechend flächige Oberflächenbehandlung zu ermöglichen. Wenn ein solcher Fächer erzeugt wird, ist es wiederum wünschenswert, den Winkel, den der Fächer beschreibt, zur Anpassung an das zu strahlende Werkstück zu verändern. Dieses geschieht in vorteilhafter Weise durch die Vorrichtung nach den Ansprüchen 6 bis 8.In many applications it is desirable to create a fan for the blasting medium in the discharge area of the blasting medium so as to enable a correspondingly flat surface treatment. When such a fan is created, it is again desirable to change the angle described by the fan to match the workpiece to be blasted. This is done advantageously by the device according to claims 6 to 8.

Wenn eine besonders hohe Beschleunigung erwünscht ist oder die Beschleunigung einer Vorrichtung nicht ausreicht, so kann die Vorrichtung so aufgebaut werden, wie in Anspruch 9 angegeben.If a particularly high acceleration is desired or the acceleration of a device is insufficient, the device can be constructed as specified in claim 9.

Im folgenden wird die Erfindung unter Hinweis auf die Zeichnung anhand verschiedener Ausführungsbeispiele näher erläutert.The invention is explained in more detail below with reference to the drawing using various exemplary embodiments.

Es zeigt:

Fig. 1
einen Querschnitt durch die wesentlichen Teile einer Vorrichtung nach der Erfindung;
Fig. 2
einen Schnitt gemäß der Linie A-A der Fig. 1;
Fig. 3
eine schematische Darstellung einer abgewandelten Ausführungsform, und
Fig. 4
einen der Fig. 2 entsprechenden Schnitt, jedoch durch eine andere Ausführungsform.
It shows:
Fig. 1
a cross section through the essential parts of a device according to the invention;
Fig. 2
a section along the line AA of Fig. 1;
Fig. 3
is a schematic representation of a modified embodiment, and
Fig. 4
a section corresponding to FIG. 2, but through another embodiment.

Die in der Zeichnung dargestellte Vorrichtung besteht aus einem Rotor 1 und einer in diesem angeordneten Magnetanordnung 3 aus einzelnen Sektoren 2 aus permanentmagnetischem Material. Die Magnetanordnung erstreckt sich normalerweise über einen Winkelbereich von 90 bis 270 °. Sie liegt nahe an der inneren Oberfläche des Rotors 1 an und erzeugt ein entsprechendes magnetisches Feld. Dieses greift über den Luftspalt 4 durch die Rotoroberfläche in den Raum außerhalb der Oberfläche über. Es ist so in der Lage, senkrecht zur Rotoraußenfläche gerichtete Kräfte auf ferromagnetische Partikel auszuüben, und diese entgegen der Wirkung der Zentrifugalkräfte an die Oberfläche zu binden. Um zu einer guten Ausnutzung der Kraftwirkung des magnetischen Feldes zu gelangen, muß der Luftspalt möglichst klein gehalten werden.The device shown in the drawing consists of a rotor 1 and a magnet arrangement 3 arranged therein, comprising individual sectors 2 made of permanent magnetic material. The magnet arrangement normally extends over an angular range of 90 to 270 °. It lies close to the inner surface of the rotor 1 and generates a corresponding magnetic field. This reaches over the air gap 4 through the rotor surface into the space outside the surface. It is thus able to exert forces on ferromagnetic particles directed perpendicular to the outer surface of the rotor and to bind them to the surface against the action of the centrifugal forces. In order to make good use of the force of the magnetic field, the air gap must be kept as small as possible.

Der Rotor 1 besteht - wie aus Fig. 2 ersichtlich - aus Iamellen 5 aus weichmagnetischem Material, die die Aufgabe der Führung des magnetischen Flusses übernehmen. Die Lamellenstruktur verhindert die Ausbildung von schädlichen Wirbelströmen. Die jeweils einen Pol der permanentmagnetischen Sektoren 2 überdeckenden Bereiche aus weichmagnetischem Material sind durch Zwischenringe 6 aus nicht magnetisierbarem Material getrennt. Dadurch tritt der magnetische Fluß aus den scharfen Kanten des weichmagnetischen Materials in den Außenraum dort über, wo er die gewünschte Kraft entfalten soll.As can be seen in FIG. 2, the rotor 1 consists of lamellae 5 made of soft magnetic material, which take over the task of guiding the magnetic flux. The lamellar structure prevents the formation of harmful eddy currents. The areas of soft magnetic material covering one pole of the permanent magnetic sectors 2 are separated by intermediate rings 6 made of non-magnetizable material. As a result, the magnetic flux passes from the sharp edges of the soft magnetic material into the outside space where it should develop the desired force.

Um den für die Kraftwirkung entscheidenden Gradienten des magnetischen Feldes noch weiter zu erhöhen, sind die Lamellen 5 außen mit einer rauhen Oberfläche versehen, die aus einer festhaftenden Schicht 7 aus körnigem Material mit besonders hoher Sättigungsinduktion (z.B. Schrot aus Kobaltstahl) bestehen kann. Die Rauhigkeit der Rotoroberfläche bedingt eine bessere Haftung des ferromagnetischen Strahlmittels in diesem Bereich und fördert somit die Beschleunigung.In order to further increase the gradient of the magnetic field, which is decisive for the force effect, the lamellae 5 are provided on the outside with a rough surface, which can consist of a firmly adhering layer 7 made of granular material with a particularly high saturation induction (eg shot from cobalt steel). The roughness of the rotor surface leads to better adhesion of the ferromagnetic abrasive in this area and thus promotes acceleration.

Die Zuführeinrichtung zur tangentialen Zuführung des Strahlmittels ist mit 8 bezeichnet. Sie besteht aus einem in zwei Richtungen einstellbaren Permanent- oder Elektromagneten 9 und einem magnetischen Joch 10. Hierdurch wird eine gezielte Rückführung des von dem Magneten 9 erzeugten magnetischen Flusses über den Teil des Rotors 1 und den Luftspalt 11 erreicht. Es erfolgt eine Vorbeschleunigung des Strahlmittels, wobei der erzeugte Feldgradient genau in Richtung der Tangente an den Rotor im Auftreffpunkt weist. Es erfolgt eine Beschleunigung von der Geschwindigkeit V₀ auf die Startgeschwindigkeit von Vstart, die im Bereich von 25 m/s liegt.The feed device for the tangential feed of the blasting medium is designated by 8. It consists of a permanent or electromagnet 9 that can be adjusted in two directions and a magnetic yoke 10. This results in a targeted return of the magnetic flux generated by the magnet 9 via the part of the rotor 1 and the air gap 11. The abrasive is pre-accelerated, with the generated field gradient pointing exactly in the direction of the tangent to the rotor at the point of impact. There is an acceleration from the speed V₀ to the starting speed of V start , which is in the range of 25 m / s.

Die Magnetanordnung 3 weist - wie der Fig. 2 zu entnehmen -einzelne Magnetstege oder -scheiben 12 auf, die durch Verdrehung gegenüber der entsprechenden, benachbarten, feststehenden Magnetstegen oder -scheiben verstellbar sind. Dieses kann auch durch gruppenweise Verstellung der Magnet stege oder -scheiben mit einer bestimmten Magnetisierungsrichtung geschehen. Auf diese Weise wird der Abwurfpunkt für einen Teil des Strahlmittels auf dem Umfang verschoben und man erhält eine größere resultierende Streubreite für den gesamten Strahl, d.h. es entsteht ein Fächer, so daß eine entsprechende große Oberfläche bestrahlt werden kann. Der Winkel, den der Fächer beschreibt, ist hierdurch zur Anpassung an die verschiedenen Werkstücke ebenfalls einstellbar.As can be seen in FIG. 2, the magnet arrangement 3 has individual magnetic webs or disks 12 which can be adjusted by rotation relative to the corresponding, adjacent, fixed magnetic webs or disks. This can also be done by group-wise adjustment of the magnetic webs or disks with a specific magnetization direction. In this way, the discharge point for part of the blasting medium is shifted on the circumference and a larger resulting scatter width is obtained for the entire beam, i.e. a fan is created so that a correspondingly large surface can be irradiated. The angle that the fan describes can also be adjusted to adapt to the various workpieces.

In Fig. 3 ist eine Ausführungsform dargestellt, bei der zwei Vorrichtungen nach der Erfindung hintereinandergeschaltet sind, wenn eine besonders hohe Abwurfgeschwindigkeit erwünscht wird oder aber eine Vorrichtung aus bestimmten konstruktiven Gründen zur Beschleunigung nicht ausreicht.3 shows an embodiment in which two devices according to the invention are connected in series if a particularly high ejection speed is desired or if one device is not sufficient for acceleration for certain design reasons.

Bei der dargestellten Ausführungsform erstrecken sich die permanentmagnetischen Systeme 16 über jeweils 180 °. Der Abwurfpunkt der ersten Vorrichtung 13 ist die Übergabestelle für die zweite Vorrichtung 14, d.h. der Eingangsbereich dieser Vorrichtung. Die beiden Vorrichtungen sind also komplementär zu einander angeordnet.In the embodiment shown, the permanent magnetic systems 16 each extend over 180 °. The drop point of the first device 13 is the transfer point for the second device 14, ie the entrance area of this device. The two devices are thus complementary to each other.

Die in Fig. 4 dargestellte Ausführungsform ist insbesondere dann von Vorteil, wenn eine breitere Rotoranordnung (axial länger) mit breiteren Weicheisenringen vorgesehen ist. Es ist erkennbar, daß die Magnetanordnung 3 aus den Sektoren 2 im mittleren Bereich anders aufgebaut ist. Der mittlere Sektor ist aufgeteilt, so daß zwei Sektoren mit gleicher Polrichtung nebeneinander liegen. Jeder mittlere Sektor liegt am Rand der zugeordneten Lamelle 5 aus weichmagnetischem Material.The embodiment shown in FIG. 4 is particularly advantageous if a wider rotor arrangement (axially longer) with wider soft iron rings is provided. It can be seen that the magnet arrangement 3 from the sectors 2 is constructed differently in the middle region. The middle sector is divided so that two sectors with the same polar direction lie side by side. Each middle sector lies on the edge of the associated lamella 5 made of soft magnetic material.

Hierdurch gelangt der magnetische Fluß des ganz oben gelegenen Sektors 2 aus permanentmagnetischem Material auf kürzestem Wege über den Zwischenring 6 aus nicht magnetisierbarem Material in den darunter befindlichen "geteilten" Sektor 2. Für die untere Hälfte gilt aus Symmetriegründen entsprechendes. Die Aufteilung des mittleren Sektors in zwei Sektoren mit gleicher Polrichtung wird - wie gesagt -nur für den mittleren Bereich gewählt. Ist die Rotoranordnung entsprechend breiter, so können außen eine entsprechende Anzahl von Sektoren mit abwechselnder Polrichtung in entsprechender Weise vorgesehen sein.As a result, the magnetic flux of the sector 2 located at the very top, made of permanent magnetic material, travels in the shortest possible way via the intermediate ring 6 made of non-magnetizable material into the “divided” sector 2 below. The same applies to the lower half for reasons of symmetry. The division of the middle sector into two sectors with the same pole direction is - as I said - only for the middle area. If the rotor arrangement is correspondingly wider, a corresponding number of sectors with alternating pole directions can be provided in a corresponding manner on the outside.

Claims (9)

  1. Apparatus for accelerating ferromagnetic, granular blasting medium for the surface treatment with a rotor constructed as a drum, in whose interior is arranged a magnet arrangement extending over an angular range of at least 90°, as well as with a device for the tangential supply of the blasting medium in the area of the start of the magnet, characterized in that the rotor (1) comprises lamellar rings (5) made from soft magnetic material between which are arranged intermediate rings (6) made from a non-magnetizable material.
  2. Apparatus according to claim 1, characterized in that the lamellar rings of soft magnetic material have a rough surface on their outer circumference.
  3. Apparatus according to claim 2, characterized in that the rough surface is formed by a layer (7) of granular material having a high saturation induction, e.g. cobalt steel.
  4. Apparatus according to claims 1 or 2, characterized in that the device (8) for supplying the blasting medium has a magnetic preaccelerator, which comprises a permanent magnet or electromagnet (9) and a magnetic yoke (10).
  5. Apparatus according to claim 4, characterized in that the permanent magnet or electromagnet (9) is adjustable.
  6. Apparatus according to one or more of the preceding claims, characterized in that the magnet arrangement (3) provided in the interior of the rotor (1) is adjustable, particularly in the area of the discharge point of the blasting medium.
  7. Apparatus according to claim 6, characterized in that the magnet arrangement is formed by magnet webs or disks (12), which are adjustable relative to one another.
  8. Apparatus according to claim 7, characterized in that the adjustment of the magnet webs or disks (12) takes place by rotation.
  9. Apparatus according to one or more of the preceding claims, characterized in that two such apparatuses are connected in series, the discharge point of the first apparatus forming the capture area of the second apparatus and the rotor of the second apparatus rotates at a higher angular velocity than the rotor of the first apparatus.
EP87110804A 1986-08-12 1987-07-25 Device for accelerating ferromagnetic granular abrasives Expired - Lifetime EP0257318B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3627339 1986-08-12
DE3627339A DE3627339C1 (en) 1986-08-12 1986-08-12 Device for accelerating ferromagnetic, granular abrasive

Publications (3)

Publication Number Publication Date
EP0257318A2 EP0257318A2 (en) 1988-03-02
EP0257318A3 EP0257318A3 (en) 1989-01-18
EP0257318B1 true EP0257318B1 (en) 1992-09-23

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EP87110804A Expired - Lifetime EP0257318B1 (en) 1986-08-12 1987-07-25 Device for accelerating ferromagnetic granular abrasives

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DE (2) DE3627339C1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016008970B4 (en) 2016-07-22 2018-09-20 Matthias Reuter Device for accelerating steel particles
DE102018005780A1 (en) 2018-07-23 2020-01-23 Matthias Reuter Device for accelerating steel particles
JP2021534006A (en) * 2018-08-13 2021-12-09 スリーエム イノベイティブ プロパティズ カンパニー Structured polished articles and methods for manufacturing them

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1008322A (en) * 1948-02-09 1952-05-16 Process and machine for pickling and sandblasting of foundry parts
DE2241506A1 (en) * 1972-08-23 1974-03-07 Schlick Kg Heinrich METHOD AND DEVICE FOR ACCELERATING FERROMAGNETIC GRAIN MATERIAL
SU764953A1 (en) * 1977-10-31 1980-09-23 Донецкий научно-исследовательский институт черной металлургии Apparatus for accelerating ferromagnetic shot

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Publication number Publication date
EP0257318A2 (en) 1988-03-02
EP0257318A3 (en) 1989-01-18
DE3627339C1 (en) 1987-07-02
DE3781850D1 (en) 1992-10-29

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