EP0006404B1 - Apparatus for deburring of flat workpieces - Google Patents

Apparatus for deburring of flat workpieces Download PDF

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Publication number
EP0006404B1
EP0006404B1 EP78100267A EP78100267A EP0006404B1 EP 0006404 B1 EP0006404 B1 EP 0006404B1 EP 78100267 A EP78100267 A EP 78100267A EP 78100267 A EP78100267 A EP 78100267A EP 0006404 B1 EP0006404 B1 EP 0006404B1
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EP
European Patent Office
Prior art keywords
bristles
workpiece
brush
rollers
brushes
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
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EP78100267A
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German (de)
French (fr)
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EP0006404A1 (en
Inventor
Hans Pörsch
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Siemens AG
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Siemens AG
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Priority to DE7878100267T priority Critical patent/DE2861594D1/en
Priority to EP78100267A priority patent/EP0006404B1/en
Priority to IT23896/79A priority patent/IT1121961B/en
Publication of EP0006404A1 publication Critical patent/EP0006404A1/en
Application granted granted Critical
Publication of EP0006404B1 publication Critical patent/EP0006404B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B35/00Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor

Definitions

  • the invention relates to a device for deburring or rounding the edges of flat workpieces, in which brushes work on the workpieces with alternating brushing directions.
  • DE-AS 10 03 624 discloses a device for the surface treatment of plates or strips by means of brushes which are moved to and fro.
  • each brush holder which is supported by cantilevered leaf springs, is connected by a coupling to an associated eccentric mass, fast rotating shaft which runs in bearings which are guided by a link which can be swung back and forth about a fixed axis.
  • the invention has for its object to provide a device of the type mentioned, with which it is possible to deburr and round flat workpieces in one machining step on all edges.
  • a device which is characterized by a clamping table for holding the flat workpiece, a brush with a flat base surface opposite the clamping table and bristles which are perpendicular to the base surface and point towards the workpiece, the bristles of which stand up on the workpiece surface Ends have a maximum lateral deflection which is less than the deflection of the bristle carrier body caused by the drive of the brush, and a drive for an eccentrically rotating movement of the brush parallel to the workpiece plane.
  • the brush carrying the bristles is not rotated about a fixed rotational axis (the bristles would describe concentric circular movements and grinding marks like the grains of a grinding wheel). Rather, the brush is moved eccentrically like an orbital sander such that each bristle describes a circular movement parallel to the workpiece surface, but each of these circular movements has its own axis of rotation (FIG. 1). As a result, each point of the surface is swept and sanded one after the other in a constantly changing direction.
  • the bristles are elastic, they follow the profile of the workpieces at the edges, thereby removing the edges or defusing them by means of continuous slight shaping.
  • the maximum possible lateral deflection of the bristles standing on the surface must be less than the deflection of the bristle carrier caused by the drive of the brush, so that the free bristle ends describe the desired circular movement on the workpiece.
  • the bristles of normal brushes are flexible and their bristle ends therefore only follow the circular movement very incompletely. It is therefore proposed to use brushes whose bristles are very stiff. This can be done by a suitable bristle material, e.g. Steel.
  • the lateral mobility of the bristle ends can advantageously be limited by the fact that the bristles are packed very densely, e.g. with a packing density of over 30%. Plastic bristles in which abrasives are stored can also be used.
  • the space between the bristles is preferably filled with a filling compound that is plastic or elastic, which is subject to greater abrasion than the bristles themselves.
  • a filling compound that is plastic or elastic, which is subject to greater abrasion than the bristles themselves.
  • the free bristle ends become a depth of one millimeter or slightly more due to the abrasion exposed, so that the free bristle ends can follow the edge profile elastically, but are limited in their lateral movement by the remaining filling compound.
  • An abrasive can advantageously be incorporated into the filling compound, so that additional abrasive material gets onto the surface to be processed when the filling compound is abraded.
  • Fig. 1 shows the trajectories 20 of the individual bristles, which arise during an eccentric movement of the brush and each represent circles about separate axes of rotation 21, are shown schematically.
  • Fig. 2 shows one Device according to the invention.
  • 3 shows a preferred embodiment for holding and transporting the workpiece.
  • 4 to 6 relate to advantageous designs of the brushes that can be used.
  • the device according to the invention consists of a clamping table 1 for holding a workpiece 2.
  • the clamping table 1 can be e.g. be designed as a magnetic clamping table or contain suction cups or mechanical holders for the workpiece.
  • a brush 3 is arranged opposite the table surface, which contains a flat base surface 4 and bristles 5 that are perpendicular to it and directed towards the workpiece.
  • the brush 3 is set in an eccentrically circular movement by a drive motor 6.
  • the eccentric circular movement is caused by the drive shaft 7 driving an eccentric 8 attached to the brush body 3.
  • the eccentric circular movement arises from infinitesimal parallel displacements of the brush, which form a closed circular path.
  • At least a second eccentric 9, which is driven by a second drive shaft 10, is advantageously arranged on the brush for guiding the brush.
  • This second drive shaft 10 is driven synchronously by the drive 6 by means of toothed rings 11 and a toothed belt 12.
  • the eccentricity of the eccentrics 8 and 9 can advantageously be adjusted in order to adapt the amplitude of the eccentric circular movement to the flexibility of the bristles of the tool.
  • the distance between the clamping table 1 and the brush 3 can be adjusted.
  • a rail 14 is used for this purpose.
  • rollers 30 (FIG. 3) can be used, which press the workpiece onto the table 33 for holding and, if a roller drive 31 is provided, transport it.
  • These rollers 30 are advantageously opposed to counter rollers 32 to form pairs of transport rollers.
  • the distance between the pairs of rollers must be smaller than the length of the workpiece, which is why the rollers 30 are advantageously selected in recesses so large that the oscillating circuit movement of the brush is not impeded by the rollers. With sufficiently small roller spacing, both long and short workpieces can be processed on the same device without retrofitting.
  • the relative movement between the bristles and the workpiece surface largely corresponds to an eccentric circular movement.
  • the workpiece shows a good deburring and edge rounding after the treatment.
  • a brush with a flat base, which is constructed according to this principle (Fig. 5), is therefore also suitable.
  • the device according to the invention takes up little space and can therefore also be used in longitudinal cycle machines and production lines in which there would be no space for three roller brushes.
  • the device can be used in conjunction with pre-grinding.
  • the cutting beads resulting from flame cutting are roughly removed with a belt grinding machine, the belt grinding machine being followed by a vibrating brush device which removes the grinding burrs formed and rounds the edges. A high working speed can be achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Entgraten oder Verrunden der Kanten ebener Werkstücke, bei der Bürsten die Werkstücke mit wechselnder Bürstrichtung bearbeiten.The invention relates to a device for deburring or rounding the edges of flat workpieces, in which brushes work on the workpieces with alternating brushing directions.

Es ist bekannt, daß beim Bürsten ebener, flächiger Werkstücke, z.B. gestanzter oder geschnittener Bleche für Platinen, Schrankwände, Frontplatten aus der Blechebene herausstehende Grate abgetragen sowie die Kanten oder Werkstücke verrundet werden. Man verwendet hierzu häufig rotierende Walzenbürsten, wobei es jedoch nötig ist, die Werkstücke in mehreren seitlich oder räumlich getrennten Schritten mit jeweils wechselnder Bürstrichtung zu bearbeiten, um eine gleichmäßige Rundum-Entgratung bzw. Kantenverrundung zu erhalten. Daher sind derartige Anlagen verhältnismäßig aufwendig, sowohl hinsichtlich des Antriebes der einzelnen Walzen und deren Handhabung, wie auch hinsichtlich des Platzbedarfs.It is known that when brushing flat, flat workpieces, e.g. punched or cut sheets for blanks, wall units, front panels, burrs protruding from the sheet level and the edges or workpieces are rounded. Rotating roller brushes are often used for this, but it is necessary to machine the workpieces in several laterally or spatially separated steps, each with a different brushing direction, in order to obtain a uniform all-round deburring or edge rounding. Such systems are therefore relatively complex, both with regard to the drive of the individual rollers and their handling, and also with regard to the space requirement.

Weiterhin ist durch die DE-AS 10 03 624 eine Vorrichtung für die Oberflächenbehandlung von Platten oder Bändern mittels hin-und herbewegten Bürsten bekannt. Bei dieser bekannten Vorrichtung ist jeder von einseitig eingespannten Blattfedern getragene Bürstenträger durch eine Koppel mit einer ihm zugeordneten, exzentrische Massen aufweisenden, schnell umlaufenden Welle verbunden, die in Lagern läuft, die durch einen um eine feststehende Achse hin-und herschwingbaren Lenker geführt sind.Furthermore, DE-AS 10 03 624 discloses a device for the surface treatment of plates or strips by means of brushes which are moved to and fro. In this known device, each brush holder, which is supported by cantilevered leaf springs, is connected by a coupling to an associated eccentric mass, fast rotating shaft which runs in bearings which are guided by a link which can be swung back and forth about a fixed axis.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der genannten Art zu schaffen, mit der es möglich ist, ebene Werkstücke in einem Bearbeitungsschritt an allen Kanten zu entgraten und zu verrunden.The invention has for its object to provide a device of the type mentioned, with which it is possible to deburr and round flat workpieces in one machining step on all edges.

Dies wird gemaß der Erfindung durch eine Vorrichtung gelöst, die gekennzeichnet ist durch einen Spanntisch zum Halten des ebenen Werkstücks, einer Bürste mit ebener, dem Spanntisch gegenüberstehenden Grundfläche und auf der Grundfläche senkrecht stehenden, auf das Werkstück gerichteten Borsten, wobei deren auf der Werkstückoberfläche aufstehende Enden eine maximale seitliche Ablenkung aufweisen die geringer ist als die vom Antrieb der Bürste hervorgerufene Auslenkung des Borstentragkörpers, und einem Antrieb für eine parallel zur Werkstückebene exzentrisch kreisende Bewegung der Bürste.According to the invention, this is achieved by a device which is characterized by a clamping table for holding the flat workpiece, a brush with a flat base surface opposite the clamping table and bristles which are perpendicular to the base surface and point towards the workpiece, the bristles of which stand up on the workpiece surface Ends have a maximum lateral deflection which is less than the deflection of the bristle carrier body caused by the drive of the brush, and a drive for an eccentrically rotating movement of the brush parallel to the workpiece plane.

Bei dieser Vorrichtung wird die die Borsten tragende Bürste nicht um eine raumfeste Rotationsachse gedreht (dabei würden die Borsten konzentrische Kreisbewegungen und Schleifspuren beschreiben wie die Körner einer Schleifscheibe). Vielmehr wird die Bürste wie ein Schwingschleifer derart exzentrisch kreisend bewegt, daß zwar jede Borste eine Kreisbewegung parallel zur Werkstück-Oberfläche beschreibt, aber jede dieser Kreisbewegungen eine eigene Rotationsachse aufweist (Fig. 1). Dadurch wird jeder Punkt der Oberfläche von den Borsten nacheinander in stets wechselnder Richtung überstrichen und abgeschliffen.In this device, the brush carrying the bristles is not rotated about a fixed rotational axis (the bristles would describe concentric circular movements and grinding marks like the grains of a grinding wheel). Rather, the brush is moved eccentrically like an orbital sander such that each bristle describes a circular movement parallel to the workpiece surface, but each of these circular movements has its own axis of rotation (FIG. 1). As a result, each point of the surface is swept and sanded one after the other in a constantly changing direction.

Da die Borsten jedoch elastisch sind, folgen sie an den Kanten dem Profil der Werkstücke und tragen dabei die Kanten ab oder entschärfen sie durch fortwährendes geringes Umformen. Die nacheinander über die Kanten schleifenden ("stolpernden") Borsten wechseln jedoch entsprechend der exzentrischen Kreisbewegung der Bürste ständig ihre Richtung, so daß es zu einer gleichmäßigen Verrundung kommt, bei der Riefen und Schleifspuren praktisch nicht auftreten. Damit die einzelnen Borsten der exzentrischen Kreisbewegung der Bürste folgen, ist es erforderlich, daß die seitliche Beweglichkeit der freien Bürstenenden sehr gering, höchstens wenige Millimeter, ist. So muß die maximal mögliche seitliche Ablenkung der auf der Oberfläche aufstehenden Borsten geringer sein als die vom Antrieb der Bürste hervorgerufene Auslenkung des Borsten-Tragkörpers, damit die freien Borstenenden die angestrebte Kreisbewegung auf dem Werkstück beschreiben. Die Borsten normaler Bürsten sind nachgiebig und deren Borstenenden folgen daher der Kreisbewegung nur sehr unvollständig. Es wird daher vorgeschlagen, Bürsten zu verwenden, deren Borsten sehr steif sind. Dies kann durch ein geeignetes Borstenmaterial, z.B. Stahl, erreicht werden. Vorteilhaft kann die seitliche Beweglichkeit der Borstenenden dadurch beschränkt werden, daß die Borsten sehr dicht gepackt sind, z.B. mit einer Packungsdichte über 30%. Es können auch Borsten aus Kunststoff verwendet werden, in denen Schleifmittel eingelagert sind.However, since the bristles are elastic, they follow the profile of the workpieces at the edges, thereby removing the edges or defusing them by means of continuous slight shaping. The bristles that "rub" one after the other ("stumbling"), however, constantly change their direction in accordance with the eccentric circular movement of the brush, so that there is a uniform rounding with practically no scoring and grinding marks. So that the individual bristles follow the eccentric circular movement of the brush, it is necessary that the lateral mobility of the free brush ends is very little, at most a few millimeters. The maximum possible lateral deflection of the bristles standing on the surface must be less than the deflection of the bristle carrier caused by the drive of the brush, so that the free bristle ends describe the desired circular movement on the workpiece. The bristles of normal brushes are flexible and their bristle ends therefore only follow the circular movement very incompletely. It is therefore proposed to use brushes whose bristles are very stiff. This can be done by a suitable bristle material, e.g. Steel. The lateral mobility of the bristle ends can advantageously be limited by the fact that the bristles are packed very densely, e.g. with a packing density of over 30%. Plastic bristles in which abrasives are stored can also be used.

Bevorzugt wird der Zwischenraum zwischen den Borsten mit einer Füllmasse ausgefüllt, die plastisch oder elastisch ist, wobei diese einem höheren Abrieb unterworfen ist als die Borsten selbst. Nach kurzen Betriebsdauern werden dabei durch den Abrieb die freien Borstenenden in einer Tiefe von einem Millimeter oder etwas darüber freigelegt, so daß die freien Borstenenden zwar dem Kantenprofil elastisch folgen können, jedoch durch die verbleibende Füllmasse in ihrer seitlichen Bewegung beschränkt sind. Vorteilhaft kann in die Füllmasse ein Schleifmittel eingelagert sein, so daß beim Abrieb der Füllmasse zusatzliches Schleifmaterial auf die zu bearbeitende Oberfläche gelangt.The space between the bristles is preferably filled with a filling compound that is plastic or elastic, which is subject to greater abrasion than the bristles themselves. After short operating times, the free bristle ends become a depth of one millimeter or slightly more due to the abrasion exposed, so that the free bristle ends can follow the edge profile elastically, but are limited in their lateral movement by the remaining filling compound. An abrasive can advantageously be incorporated into the filling compound, so that additional abrasive material gets onto the surface to be processed when the filling compound is abraded.

Anhand mehrerer Ausführungsbeispiele und Figuren wird die Erfindung näher erläutert.The invention is explained in more detail with reference to several exemplary embodiments and figures.

In Fig. 1 sind die Bewegungsbahnen 20 der einzelnen Borsten, die bei einer exzentrischen Bewegung der Bürste entstehen und jeweils Kreise um getrennte Rotationsachsen 21 darstellen, schematisch dargestellt. Fig. 2 zeigt eine Vorrichtung gemäß der Erfindung. In Fig. 3 ist eine bevorzugte Ausführungsform zum Halten und Transportieren des Werkstückes gezeigt. Die Fig. 4 bis 6 betreffen vorteilhafte Ausführungen der verwendbaren Bürsten.In Fig. 1, the trajectories 20 of the individual bristles, which arise during an eccentric movement of the brush and each represent circles about separate axes of rotation 21, are shown schematically. Fig. 2 shows one Device according to the invention. 3 shows a preferred embodiment for holding and transporting the workpiece. 4 to 6 relate to advantageous designs of the brushes that can be used.

Die Vorrichtung gemäß der Erfindung besteht entsprechend Fig. 2 aus einem Spanntisch 1 zum Halten eines Werkstückes 2. Der Spanntisch 1 kann dabei z.B. als Magnetspanntisch ausgebildet sein oder Saugnäpfe oder mechanische Halterungen für das Werkstück enthalten. Der Tischfläche gegenüber ist eine Bürste 3 angeordnet, die eine ebene Grundfläche 4 und darauf senkrecht stehende, auf das Werkstück gerichtete Borsten 5 enthält. Die Bürste 3 wird von einem Antriebsmotor 6 in eine exzentrisch kreisende Bewegung versetzt.2, the device according to the invention consists of a clamping table 1 for holding a workpiece 2. The clamping table 1 can be e.g. be designed as a magnetic clamping table or contain suction cups or mechanical holders for the workpiece. A brush 3 is arranged opposite the table surface, which contains a flat base surface 4 and bristles 5 that are perpendicular to it and directed towards the workpiece. The brush 3 is set in an eccentrically circular movement by a drive motor 6.

Die exzentrische Kreisbewegung wird hervorgerufen, indem die Antriebswelle 7 einen am Bürstenkörper 3 befestigten Exzenter 8 antreibt. Die exzentrische Kreisbewegung entsteht dabei aus infinitesimalen Parallelverschiebungen der Bürste, die sich zu einer geschlossenen Kreisbahn zusammensetzen. Vorteilhaft ist zur Führung der Bürste wenigstens ein zweiter Exzenter 9 an der Bürste angeordnet, der von einer zweiten Antriebswelle 10 angetrieben wird. Diese zweite Antriebswelle 10 wird mittels Zahnkränzen 11 und einem Zahnriemen 12 synchron vom Antrieb 6 angetrieben.The eccentric circular movement is caused by the drive shaft 7 driving an eccentric 8 attached to the brush body 3. The eccentric circular movement arises from infinitesimal parallel displacements of the brush, which form a closed circular path. At least a second eccentric 9, which is driven by a second drive shaft 10, is advantageously arranged on the brush for guiding the brush. This second drive shaft 10 is driven synchronously by the drive 6 by means of toothed rings 11 and a toothed belt 12.

Vorteilhaft ist die Exzentrizität der Exzenter 8 und 9 verstellbar, um die Amplitude der exzentrischen Kreisbewegung der Nachgiebigkeit der Borsten des Werkzeuges anzupassen. Um die Vorrichtung der jeweiligen Werkstückdicke anzupassen und bei Abrieb der Borsten nachzustellen, ist der Abstand zwischen dem Spanntisch 1 und der Bürste 3 verstellbar. Hierzu dient eine Schiene 14.The eccentricity of the eccentrics 8 and 9 can advantageously be adjusted in order to adapt the amplitude of the eccentric circular movement to the flexibility of the bristles of the tool. In order to adapt the device to the respective workpiece thickness and to adjust it when the bristles wear, the distance between the clamping table 1 and the brush 3 can be adjusted. A rail 14 is used for this purpose.

Für lange Werkstücke oder für einen kontinuierlichen Betrieb ist es vorteilhaft, die Vorrichtung als Durchlauf-Bearbeitungsmaschine auszubilden, d.h. das Werkstück wird während der Bearbeitung unter dem Werkzeug (Bürste) verschoben. Hierzu ist eine Transporteinrichtung für das Werkstück nötig. Dazu können Rollen 30 (Fig. 3) dienen, die das Werkstück zum Halten auf den Tisch 33 pressen und, sofern ein Rollenantrieb 31 vorgesehen ist, transportieren. Vorteilhaft stehen diesen Rollen 30 Gegenrollen 32 zur Bildung von Transportrollen-Paaren gegenüber. Der Abstand der Walzenpaare muß kleiner sein als die Werkstücklänge, weshalf die Rollen 30 vorteilhaft in Aussparungen sind dabei so groß gewählt, daß die Schwingkreisbewegung der Bürste durch die Rollen nicht behindert wird. Bei hinreichend geringem Rollenabstand können sowohl lange wie kurze Werkstücke ohne Umrüstung an der gleichen Vorrichtung bearbeitet werden.For long workpieces or for continuous operation, it is advantageous to design the device as a continuous processing machine, i.e. the workpiece is moved under the tool (brush) during machining. This requires a transport device for the workpiece. For this purpose, rollers 30 (FIG. 3) can be used, which press the workpiece onto the table 33 for holding and, if a roller drive 31 is provided, transport it. These rollers 30 are advantageously opposed to counter rollers 32 to form pairs of transport rollers. The distance between the pairs of rollers must be smaller than the length of the workpiece, which is why the rollers 30 are advantageously selected in recesses so large that the oscillating circuit movement of the brush is not impeded by the rollers. With sufficiently small roller spacing, both long and short workpieces can be processed on the same device without retrofitting.

Zur Erprobung geeigneter Bürsten wurden zunächst unter dem Namen "Feilbürsten" handelsübliche Stahldrahtbürsten verwendet, deren Borsten etwa 0,2mm Durchmesser und etwa 5mm freie Borstenlänge bei einer Besatzdichte von etwa 2% besitzen. Derartige Bürsten zeigen zwar bereits eine erhebliche Entgratung und Umformung der Kanten gestanzter Bleche, jedoch weisen die Kanten Riefen auf. Das Arbeitsergebnis kann verbessert werden, wenn die Packung der Stahlborsten erheblich dichter gewählt wird, z.B. zu 60% Besatzdichte. Man kan aber aus den genannten handelsüblichen Bürsten auch dadurch geeignete Bürsten herstellen, daß die Zwischenräume mit einer Elastomermasse ausgegossen werden. Beim Betrieb wird die Elastomermasse an der Oberfläche ausgerieben und es entsteht die in Fig. 4 gezeigte Struktur, bei der die Drähte 40, die mittels eines Tragkörpers 41 an Bürstenrücken 42 befestigt sind, etwa einen Millimeter aus der Elastomerschicht 43 herausragen.To test suitable brushes, commercially available steel wire brushes were first used under the name "filing brushes", the bristles of which have a diameter of about 0.2 mm and a free length of about 5 mm with a stocking density of about 2%. Such brushes already show considerable deburring and shaping of the edges of stamped sheets, but the edges have grooves. The work result can be improved if the packing of the steel bristles is chosen to be considerably closer, e.g. 60% stocking density. However, suitable brushes can also be produced from the above-mentioned commercial brushes by pouring the gaps with an elastomer compound. During operation, the elastomer mass is rubbed out on the surface and the structure shown in FIG. 4 is formed, in which the wires 40, which are fastened to the back of the brush 42 by means of a supporting body 41, protrude approximately one millimeter from the elastomer layer 43.

Mit einer durch einen derartigen Elastomer-Verguß stabilisierte Stahldrahtbürste (Grundfläche 6x6cm), deren Borsten eine Dicke von etwa 0,08mm und eine Länge von ca. 15mm bei einer Besatzdichte von etwa 7% besitzen, wurden gestanzte Tiefziehbleche 8x8cm mit künstlichen Graten verschiedener Stärke als Prüfkörper behandelt. Dazu wurde die Bürste als "Schleifschuh" auf einen Schwingschleifer (Frequenz etwa 50 Hz, Amplitude etwa 4mm) gespannt. Nach einer kurzen Einlaufzeit betrug die Länge der frei aus dem Elastomer-Verguß herausstehenden Drahtborstenenden etwa 1 mm. An den Kanten wurde eine Materialabtragung von etwa 0,1 mm innerhalb 30 sec. erzielt. Die Oberfläche der Kanten war praktisch riefenfrei. Ferner wurden Borsten verwendet, wie sie bei sogenannten "flexiblen Schleifahlen" verwendet werden. Derartige Bürsten sind bisher nur in Flaschenbürsten-Form erhältlich (Fig. 5). Sie besitzen z.B. Borsten 50 aus Polyamid mit etwa 1 mm Durchmesser und einer freien Borstenlänge von etwa 10mm. An ihrem Ende sind Schleifkugeln 51 mit etwa 4mm Durchmesser befestigt, die aus einem' Siliziumkarbid der Körnung 320, das mit Kunstharz gebunden ist, bestehen. Die Besatzdichte beträgt etwa 30%. Eine derartige Walzenbürste wurde fest eingespannt und das Werkstück zur Simulierung des Arbeitsvorganges auf einen Schwingschleifer befestigt. Die Relativbewegung zwischen den Borsten und der Werkstückoberfläche entspricht dabei weitgehend einer exzentrischen Kreisbewegung. Das Werkstück zeigt nach der Behandlung eine gute Entgratung und Kantenverrundung. Eine Bürste mit ebener Grundfläche, die nach diesem Prinzip aufgebaut ist (Fig. 5), ist daher ebenfalls geeignet.With a steel wire brush stabilized by such an elastomer encapsulation (base area 6x6cm), the bristles of which have a thickness of approximately 0.08mm and a length of approximately 15mm with a stocking density of approximately 7%, stamped thermoformed sheets 8x8cm with artificial burrs of different thickness were used Test specimen treated. For this purpose, the brush was clamped as an "abrasive shoe" on an orbital sander (frequency about 50 Hz, amplitude about 4mm). After a short running-in period, the length of the wire bristle ends protruding freely from the elastomer potting was approximately 1 mm. At the edges, a material removal of approximately 0.1 mm was achieved within 30 seconds. The surface of the edges was practically free of marks. Furthermore, bristles were used, as are used in so-called "flexible grinding tools". Such brushes have so far only been available in bottle brush form (FIG. 5). You have e.g. Bristles 50 made of polyamide with a diameter of approximately 1 mm and a free bristle length of approximately 10 mm. At its end, grinding balls 51 with a diameter of approximately 4 mm are attached, which consist of a 'silicon carbide of grain size 320, which is bonded with synthetic resin. The stocking density is about 30%. Such a roller brush was firmly clamped and the workpiece was attached to an orbital sander to simulate the work process. The relative movement between the bristles and the workpiece surface largely corresponds to an eccentric circular movement. The workpiece shows a good deburring and edge rounding after the treatment. A brush with a flat base, which is constructed according to this principle (Fig. 5), is therefore also suitable.

Auch mit Borsten aus Polyamid und darin eingebettetem Siliziumkarbid-Schleifkörnern der Körnung 120, wie sie bei handelsüblichen Walzen-Schleifbürsten verwendet werden, kann durch entsprechend hohe Besatzdichte ein gutes Arbeitsergebnis erzeugt werden. Zur Erprobung wurde loses Borstenmaterial derartiger Schleifbürsten mit einer Borstenlänge von etwa 1 cm auf einer 6x6cm großen Fläche zu einer Packungsdichte von 6096 dicht gepackt und mit einem Tragkörper verklebt. Fig. 6 zeigt die Struktur, bei der auf dem Tragkörper 60 die Borsten 61 mittels einer Schicht 62 aus geschmolzenem Borstenmaterial befestigt sind. Diese Art der Befestigung, bei der auf Haltebänder verzichtet wird, ermöglicht die angestrebte hohe Packung. Bei der Behandlung der erwähnten Probekörper aus gestanzten Tiefziehblechen mit einer derartigen Bürste wurde nachgewiesen, daß bereits nach 30 sec. die feinsten Stanzgrate und messerscharfen Kanten soweit entschärft sind, daß die Schnittverletzungsgefahr beseitigt ist.Even with bristles made of polyamide and silicon carbide abrasive grains of grain size 120 embedded in them, such as are used in commercially available roller abrasive brushes, a good work result can be produced by a correspondingly high stocking density. For testing, loose bristle material of such abrasive brushes with a bristle length of about 1 cm was combined into a 6x6cm area Packing density of 6096 packed tightly and glued to a support body. FIG. 6 shows the structure in which the bristles 61 are fastened on the support body 60 by means of a layer 62 made of molten bristle material. This type of attachment, in which there are no straps, enables the desired high packing. When treating the test specimens made from stamped deep-drawn sheet metal with such a brush, it was demonstrated that the finest stamped burrs and razor-sharp edges are defused after 30 seconds to the extent that the risk of cuts is eliminated.

Um das gleiche Arbeitsergebnis mit einer Vorrichtung, die vier schnell rotierende Bürsten enthält, zu erzielen, muß das Werkstück zwar nur eine erheblich kürzere (etwa um den Faktor 10 kleinere) Zeit bearbeitet werden als bei der Vorrichtung gemäß der Erfindung. Während nämlich bei der Vorrichtung nach der Erfindung die Borsten die Kanten abreiben, schlagen die Borsten rotierender Walzenbürsten gegen die Kanten. Jedoch sind hierbei vier Bearbeitungsschritte (vier nacheinander angeordnete, um verschiedene Rotationsachsen rotierende Bürsten) anstelle eines einzigen Bearbeitungsschrittes nötig. Die hohe Leistungsfähigkeit von Bürstmaschinen mit rotierenden Walzenbürsten kann jedoch häufig nicht genutzt werden, so daß eine einfachere und kostengünstigere "Schwingbürstmaschine" gemäß der Erfindung in den meisten Fällen wirtschaftlicher ist. Außerdem benötigt die Vorrichtung nach der Erfindung nur wenig Platz und kann daher auch in Längstaktmaschine und Fertigungsstraßen eingesetzt werden, in denen für drei Walzenbürsten kein Platz vorhanden wäre. Insbesondere kann die Vorrichtung in Verbindung mit einem Vorschleifen angewendet werden. So können z.B. die bei einem Brennschneiden entstehenden Schneidwülste mit einer Bandschleifmaschine grob entfernt werden, wobei der Bandschleifmaschine eine Schwingbürst-Vorrichtung nachgeschaltet ist, die die entstehenden Schleifgrate entfernt und die Kanten verrundet. Dabei kann eine hohe Arbeitsgeschwindigkeit erreicht werden.In order to achieve the same work result with a device which contains four rapidly rotating brushes, the workpiece only has to be machined for a considerably shorter (approximately 10 times smaller) time than with the device according to the invention. Namely, while the bristles rub the edges in the device according to the invention, the bristles of rotating roller brushes hit the edges. However, four processing steps (four brushes arranged one after the other, rotating about different axes of rotation) are required instead of a single processing step. However, the high performance of brushing machines with rotating roller brushes can often not be used, so that a simpler and cheaper "vibrating brushing machine" according to the invention is in most cases more economical. In addition, the device according to the invention takes up little space and can therefore also be used in longitudinal cycle machines and production lines in which there would be no space for three roller brushes. In particular, the device can be used in conjunction with pre-grinding. For example, the cutting beads resulting from flame cutting are roughly removed with a belt grinding machine, the belt grinding machine being followed by a vibrating brush device which removes the grinding burrs formed and rounds the edges. A high working speed can be achieved.

Claims (11)

1. Apparatus for deburring or rounding off the edges of flat workpieces, in which the workpieces are treated with brushes in alternating brushing directions, characterised by a clamping table (1) which serves to hold the flat workpiece (2), a brush (3) having a flat base (4) which is arranged opposite the clamping block (1), and provided with bristles (5) which are mounted vertically on the base (4) and are directed towards the workpiece, wherein the ends of the bristles contacting the workpiece surface have a maximum lateral deflection which is smaller than the deflection of the body carrying the bristles caused by the drive, and a drive (6) for effecting an eccentrically circular movement of the brush parallel to the plane of the workpiece.
2. Apparatus as claimed in Claim 1, characterised in that the lateral movement of the free ends of the bristles is limited by a dense packing of the bristles (5).
3. Apparatus as claimed in Claim 1 or 2, characterised in that the bristles are made of steel.
4. Apparatus as claimed in Claim 1 or 2, characterised in that the bristles are made of synthetic resin with abrasives embedded therein.
5. Apparatus as claimed in one of Claims 1 to 4, characterised in that the space between the bristles (40) is filled by a plastic or elastic filling compound (43).
6. Apparatus as claimed in Claim 5, characterised in that abrasives are embedded in the filling compound (43).
7. Apparatus as claimed in one of Claims 1 to 6, characterised in that the spacing between the brush (3) and the clamping block (1) is adjustable.
8. Apparatus as claimed in one of Claims 1 to 7, characterised in that the workpiece is held on the clamping block (33) by means of rollers (30).
9. Apparatus as claimed in Claim 8, characterised in that the rollers (30) are arranged in recesses (34) in the brush (35).
10. Apparatus as claimed in Claim 8 or 9, characterised in that the workpiece is transported by the rollers (30) and oppositely located counter-rollers (32).
11. Apparatus as claimed in one of Claims 1 to 10, characterised in that the drive (6) contains a plurality of synchronously actuated eccentrics (8, 9).
EP78100267A 1978-06-28 1978-06-28 Apparatus for deburring of flat workpieces Expired EP0006404B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE7878100267T DE2861594D1 (en) 1978-06-28 1978-06-28 Apparatus for deburring of flat workpieces
EP78100267A EP0006404B1 (en) 1978-06-28 1978-06-28 Apparatus for deburring of flat workpieces
IT23896/79A IT1121961B (en) 1978-06-28 1979-06-27 PROCEDURE FOR DEBURRING FLAT WORKPIECES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP78100267A EP0006404B1 (en) 1978-06-28 1978-06-28 Apparatus for deburring of flat workpieces

Publications (2)

Publication Number Publication Date
EP0006404A1 EP0006404A1 (en) 1980-01-09
EP0006404B1 true EP0006404B1 (en) 1982-02-03

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ID=8185900

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EP78100267A Expired EP0006404B1 (en) 1978-06-28 1978-06-28 Apparatus for deburring of flat workpieces

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EP (1) EP0006404B1 (en)
DE (1) DE2861594D1 (en)
IT (1) IT1121961B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993023202A1 (en) * 1992-05-14 1993-11-25 Bodilsen Hodling A/S Apparatus for the buffing of edges on an elongated item
JP2990069B2 (en) * 1996-06-25 1999-12-13 株式会社守屋鉄工所 Burr smoothing device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1003624B (en) * 1953-07-25 1957-02-28 Achenbach Soehne Ges Mit Besch Device for surface treatment of plates or tapes using brushes
GB1461570A (en) * 1973-04-13 1977-01-13 Hawker Siddeley Aviation Ltd Deburring of workpieces
US4078905A (en) * 1976-12-03 1978-03-14 Mitsubishi Jukogyo Kabushiki Kaisha Edge-rounding method and apparatus therefor

Also Published As

Publication number Publication date
IT7923896A0 (en) 1979-06-27
DE2861594D1 (en) 1982-03-11
IT1121961B (en) 1986-04-23
EP0006404A1 (en) 1980-01-09

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