EP2251139A2 - Polishing machine with a polishing belt and contact pressure element - Google Patents

Polishing machine with a polishing belt and contact pressure element Download PDF

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Publication number
EP2251139A2
EP2251139A2 EP10156897A EP10156897A EP2251139A2 EP 2251139 A2 EP2251139 A2 EP 2251139A2 EP 10156897 A EP10156897 A EP 10156897A EP 10156897 A EP10156897 A EP 10156897A EP 2251139 A2 EP2251139 A2 EP 2251139A2
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EP
European Patent Office
Prior art keywords
polishing
belt
machine according
portal
workpiece
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.)
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Application number
EP10156897A
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German (de)
French (fr)
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EP2251139A3 (en
Inventor
Ralf Sundermeier
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.)
Bauerrichter Maschinen- und Technischer Grosshandel & Co KG GmbH
Original Assignee
Bauerrichter Maschinen- und Technischer Grosshandel & Co KG GmbH
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Publication of EP2251139A2 publication Critical patent/EP2251139A2/en
Publication of EP2251139A3 publication Critical patent/EP2251139A3/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/005—Portal grinding machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/10—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a rigid member, e.g. pressure bar, table, pressing or supporting the belt over substantially its whole span
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant

Definitions

  • the invention relates to a polishing machine for polishing workpieces having a flat surface, comprising a workpiece carrier, a polishing portal arranged above the workpiece carrier, which is linearly movable relative to the workpiece carrier, and a drive for generating a relative movement between polishing portal and workpiece carrier.
  • the polishing portal includes a cross rotatable about a vertical axis, the arms of each carrying a rotating polishing brush, so that can be varied by rotation of the cross in the direction in which the polishing brushes paint over the workpiece surface.
  • the object of the invention is to provide a polishing machine with which the abrasion produced during polishing can be controlled more sensitively.
  • the polishing portal has an endless revolving polishing belt which extends in a direction which forms an angle with the direction of the relative movement over the entire width of the workpiece and the lower Trumm by a pressure device against the surface of the workpiece is pressable.
  • polishing machine Unlike conventional polishing machines in which the bristles of the polishing brushes each beat locally on the surface of the workpiece, can be in the polishing machine according to the invention by the pressure device and by a suitable choice of the height of the polishing portal on the entire surface uniform contact pressure of the polishing belt and thus a achieve even wear on the entire width of the workpiece.
  • Another advantage is that the polishing paste and the resulting abrasion due to the centrifugal forces at the deflection of the polishing belt are thrown only in a defined direction, so that even at higher running speeds of the polishing belt can better control the pollution of the environment.
  • the workpieces to be polished are previously sanded in a grinding machine, resulting in the surface of the sanding marks that run in a uniform direction.
  • a polishing belt that moves only in a single direction over the workpiece surface in these cases, a uniformly polished surface, provided that it is ensured that the direction of the polishing belt is not parallel to the grinding marks.
  • This can be achieved, for example, by suitable clamping of the workpiece on the workpiece carrier or by suitable adjustment of the running direction of the polishing belt or possibly also by suitable choice of the speed of movement of the polishing portal relative to the workpiece carrier.
  • a workpiece carrier 10 is shown, on the upper surface of which a plate-shaped workpiece 12 can be clamped so that its upper surface can be polished.
  • a polishing portal 14 is arranged, which is linear with the aid of a drive 16, in the direction perpendicular to the plane in Fig. 1 , can move relative to the workpiece carrier 10 and the workpiece 12.
  • the polishing portal 14 is formed by arranged on both sides of the workpiece carrier 10 vertical columns 18 and these connecting trusses 20 and receives a polishing unit 22, which is held adjustable in height in the polishing portal.
  • the polishing unit 22 has at least one endless polishing belt 24, which rotates about deflection rollers 26 and whose lower run 28 is pressed by a pressure device 30 over its entire length against the surface of the workpiece 12.
  • One of the deflection rollers 26 is driven by a motor 34 and an associated gear.
  • the motor 34, the deflection rollers 26 and the pressure device 30 are held on brackets 36, which in turn are attached to vertical screen plates 38.
  • the shield plates 38 terminate the polishing unit 22 on both sides and are connected by traverses 40 so as to form a frame.
  • This frame is by means of ball bushings or spindle nuts 42 and associated spindles 44 ( Fig. 2 ) held in the polishing portal 14.
  • the columns 18 of the polishing portal which are located on the same side of the workpiece carrier 10 (and of which therefore in Fig. 1 only one can be seen) at the upper ends by bridges 46 and at the lower ends by foot plates 48 connected to each other. Furthermore one recognizes in Fig. 2 in that the polishing unit 22 has two parallel polishing belts 28, each with associated drive and pressure devices.
  • the spindles 44 are respectively mounted in the bridge 46 and in a drive unit 50 held on the base plate 48. Between the bridge 46 and the foot plate 48 run In addition, on each side two guide rods 52 on which the screen plates 38 are guided with guide bushes 54. By rotationally driving the spindles 44, the height of the polishing unit 22 can thus be adapted precisely to the respective thickness of the workpiece 12.
  • the base plates 48 of the polishing portal are each supported on a support plate 56 adjustable in the in Fig. 2 slidably guided by a double arrow X direction on the workpiece carrier 10.
  • the drive 16 may be any suitable linear drive, in the example shown a belt drive with which the foot plates 56 and thus the entire polishing portal 14 can be moved back and forth in the direction X.
  • the polishing portal 14 could be stationary and instead of the workpiece carrier 10 to be movable. In that case, the workpiece carrier could also be a conveyor on which the workpieces pass in one direction only through the polishing portal.
  • the polishing belts 24 each extend over the entire width of the workpiece 12, that is, the positions of the guide rollers 26 determine the maximum width of the workpieces, which can be clamped onto the workpiece carrier 10. In order to prevent that the edges of the workpiece are ground off too much by the polishing belt, these edges are protected by protective strips 58, which are flush with the workpiece surface at the top.
  • the construction of the pressing device 30 will now be described with reference to FIG Fig. 3 be described in more detail.
  • the upper run of the abrasive belt 24 is guided on a plate 60, followed by a trapezoidal, downwardly open box 62 connects down.
  • a slat belt 64 which is deflected at both ends of the box on pulleys 66 and is accommodated on retractors 68 in the manner of a roller blind.
  • the retractors 68 are driven so that the fin belt 64 in an oscillating movement parallel to the polishing belt 24 is offset.
  • the slat band carries on its underside slats 70, which press on the lower run 28 of the polishing belt.
  • Fig. 4 shows a portion of the fin strip 64 in a view from below and reveals the configuration of the fins 70, here in the form of overlapping angles and for example made of felt.
  • an inflatable air bag 72 is disposed in the box 62, which is supported with its upper side abutments 74 and consequently uniformly presses with its underside over the entire length against the slat band 64 and keeps it in frictional contact with the lower run 28 of the polishing belt ,
  • the pressure in the airbag 70 (optionally also by measuring this pressure and height adjustment of the entire polishing unit), thus, the contact pressure of the fin belt 64 can be precisely controlled.
  • the lamellae 70 pass this contact pressure on the polishing belt 24 and ultimately on the workpiece surface, so that the polishing belt is pressed evenly over its entire length against the surface of the workpiece. Due to the oscillating movement of the lamella belt, local fluctuations in the contact pressure caused by the individual lamellae are blurred.
  • the air bag 72 and the slat belt 64 is still a thin, stationary sheet arranged (not visible in the drawing), which transmits the pressure and protects against friction.
  • Cooling air can be introduced into the box 62 via an air supply 76, which is connected to a blower (not shown) and optionally a cooling unit. This cooling air flows around the airbag 72 and exits at the bottom of the box 62 and thereby cools the fin belt 64 and the polishing belt 24, so that the frictional heat generated during polishing can be effectively dissipated.
  • a polishing paste can be applied to the surface of the workpiece 12. This polishing paste is then rubbed by the polishing belt 24.
  • a nozzle 78 is arranged, with which a liquid can be applied to the polishing belt 24, which is then passed with a doctor blade 80 on the surface of the polishing belt.
  • This liquid serves to dilute the polishing paste and at the same time contributes to the cooling of the polishing belt.
  • the polishing paste diluted by the liquid and the abrasion resulting from the polishing are carried along by the lower run 28 of the polishing belt (to the right in FIG Fig. 3 ) and on the guide roller 26 thrown by centrifugal force. However, the flung-off material is caught by the screen plate 38 of the polishing unit. Since the screen plates 38 are arranged on both sides of the polishing unit, the two can in Fig. 2 optionally shown polishing belts 24 are also driven in opposite directions.
  • Fig. 5 The polishing machine is shown in a schematic plan view, but in a configuration in which the polishing belts 24 are not exactly perpendicular to the direction X of the relative movement between the workpiece carrier 10 and the polishing portal 14, but are made somewhat obliquely, for example at an angle of 7 °. If the workpiece 12 has previously been ground with a grinding machine that has left in the surface to be polished grinding marks that are perpendicular to the direction X, so is ensured by the inclination of the polishing belts 24 that these grinding marks can be blurred in the polishing process. In addition, it facilitates this inclination, the polishing portal on the in Fig. 5 move right and left ends of the workpiece 12 out so that also the end portions of the workpiece can be polished with the same intensity as the central area, without the polishing tapes caught on the edges of the workpiece.
  • a perpendicular orientation of the polishing belts 24 relative to the direction X is possible, for example, in the case that the grinding marks on the workpiece surface in the direction X or in the event that the polishing portal 14 with a compared to the speed of the polishing belts 24 relatively high speed in the direction X is moved, so that a skew of the polishing belts relative to the workpiece 12 results from the superposition of the two movements.
  • the two polishing belts 24 or, more generally, the plurality of polishing belts do not run parallel to one another but form an angle with one another.
  • the angular positions of the individual polishing belts can also be adjusted independently of one another.

Abstract

The polishing machine has a workpiece carrier (10), where a polishing portal (14) is arranged over the workpiece carrier. The polishing portal is movable linearly relative to the workpiece carrier. The polishing portal has a continuously circulating polishing belt (24) which runs over the entire width of a workpiece (12) in a direction. A lower lump (28) of the polishing belt is pressed against a surface area of the workpiece by a pressing device (30).

Description

Die Erfindung betrifft eine Poliermaschine zum Polieren von Werkstücken mit ebener Oberfläche, mit einem Werkstückträger, einem über dem Werkstückträger angeordneten Polierportal, das linear relativ zu dem Werkstückträger bewegbar ist, und einem Antrieb zum Erzeugen einer Relativbewegung zwischen Polierportal und Werkstückträger.The invention relates to a polishing machine for polishing workpieces having a flat surface, comprising a workpiece carrier, a polishing portal arranged above the workpiece carrier, which is linearly movable relative to the workpiece carrier, and a drive for generating a relative movement between polishing portal and workpiece carrier.

Bei bekannten Poliermaschinen enthält das Polierportal ein um eine vertikale Achse drehbares Kreuz, dessen Arme jeweils eine rotierende Polierbürste tragen, so dass durch Drehung des Kreuzes in die Richtung variiert werden kann, in der die Polierbürsten über die Werkstückoberfläche streichen.In known polishing machines, the polishing portal includes a cross rotatable about a vertical axis, the arms of each carrying a rotating polishing brush, so that can be varied by rotation of the cross in the direction in which the polishing brushes paint over the workpiece surface.

Aufgabe der Erfindung ist es, eine Poliermaschine zu schaffen, mit der sich der beim Polieren entstehende Abrieb feinfühliger kontrollieren lässt.The object of the invention is to provide a polishing machine with which the abrasion produced during polishing can be controlled more sensitively.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Polierportal ein endloses umlaufendes Polierband aufweist, das in einer Richtung, die einen Winkel mit der Richtung der Relativbewegung bildet, über die gesamte Breite des Werkstücks verläuft und dessen unterer Trumm durch eine Andruckeinrichtung gegen die Oberfläche des Werkstücks andrückbar ist.This object is achieved in that the polishing portal has an endless revolving polishing belt which extends in a direction which forms an angle with the direction of the relative movement over the entire width of the workpiece and the lower Trumm by a pressure device against the surface of the workpiece is pressable.

Anders als bei herkömmlichen Poliermaschinen, bei denen die Borsten der Polierbürsten jeweils lokal auf die Oberfläche des Werkstücks schlagen, lässt sich bei der erfindungsgemäßen Poliermaschine durch die Andruckeinrichtung und durch geeignete Wahl der Höhe des Polierportals ein auf der gesamten Oberfläche gleichmäßiger Anpressdruck des Polierbandes und damit ein auf der gesamten Breite des Werkstücks gleichmüßiger Abrieb erreichen. Ein weiterer Vorteil besteht darin, dass die Polierpaste und der entstehende Abrieb aufgrund der Fliehkräfte an den Umlenkstellen des Polierbandes nur in einer definierten Richtung weggeschleudert werden, so dass sich auch bei höheren Laufgeschwindigkeiten des Polierbandes die Verschmutzung der Umgebung besser kontrollieren lässt.Unlike conventional polishing machines in which the bristles of the polishing brushes each beat locally on the surface of the workpiece, can be in the polishing machine according to the invention by the pressure device and by a suitable choice of the height of the polishing portal on the entire surface uniform contact pressure of the polishing belt and thus a achieve even wear on the entire width of the workpiece. Another advantage is that the polishing paste and the resulting abrasion due to the centrifugal forces at the deflection of the polishing belt are thrown only in a defined direction, so that even at higher running speeds of the polishing belt can better control the pollution of the environment.

Zumeist werden die zu polierenden Werkstücke, beispielsweise lackierte Möbelplatten, zuvor in einer Schleifmaschine geschliffen, wodurch in der der Oberfläche Schleifspuren entstehen, die in einer einheitlichen Richtung verlaufen. Wie sich gezeigt hat, lässt sich mit einem Polierband, das sich nur in einer einzigen Richtung über die Werkstückoberfläche bewegt, auch in diesen Fällen eine gleichmäßig polierte Oberfläche erreichen, sofern sichergestellt wird, dass die Laufrichtung des Polierbandes nicht parallel zu den Schleifspuren verläuft. Das lässt sich beispielsweise durch geeignete Einspannung des Werkstücks auf den Werkstückträger oder durch geeignete Einstellung der Laufrichtung des Polierbandes oder gegebenenfalls auch durch geeignete Wahl der Geschwindigkeit der Bewegung des Polierportals relativ zum Werkstückträger erreichen.In most cases, the workpieces to be polished, for example painted furniture panels, are previously sanded in a grinding machine, resulting in the surface of the sanding marks that run in a uniform direction. As has been shown, can be achieved with a polishing belt that moves only in a single direction over the workpiece surface in these cases, a uniformly polished surface, provided that it is ensured that the direction of the polishing belt is not parallel to the grinding marks. This can be achieved, for example, by suitable clamping of the workpiece on the workpiece carrier or by suitable adjustment of the running direction of the polishing belt or possibly also by suitable choice of the speed of movement of the polishing portal relative to the workpiece carrier.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments and further developments of the invention are specified in the subclaims.

Im folgenden wird ein Ausführungsbeispiel anhand der Zeichnungen näher erläutert.In the following an embodiment will be explained in more detail with reference to the drawings.

Es zeigen:

Fig. 1
eine Stirnansicht einer erfindungsgemäßen Poliermaschine;
Fig. 2
eine Seitenansicht der Poliermaschine nach Fig. 1,
Fig. 3
eine Detailansicht eines Polierbandes und einer zugehörigen An- druckeinrichtung;
Fig. 4
einen Grundriss eines Teils eines zu der Andruckeinrichtung gehö- renden Lamellenbandes; und
Fig. 5
einen schematischen Grundriss der Poliermaschine nach Fig. 1 und 2.
Show it:
Fig. 1
an end view of a polishing machine according to the invention;
Fig. 2
a side view of the polishing machine after Fig. 1 .
Fig. 3
a detailed view of a polishing belt and an associated pressure device;
Fig. 4
a plan view of a part of belonging to the pressure device lamella strip; and
Fig. 5
a schematic plan of the polishing machine after Fig. 1 and 2 ,

In Fig. 1 ist ein Werkstückträger 10 gezeigt, auf dessen oberer Oberfläche sich ein plattenförmiges Werkstück 12 aufspannen lässt, so dass dessen Ebene obere Oberfläche poliert werden kann. Über dem Werkstückträger 10 ist ein Polierportal 14 angeordnet, das sich mit Hilfe eines Antriebs 16 linear, in der Richtung senkrecht zur Zeichenebene in Fig. 1, relativ zu dem Werkstückträger 10 und dem Werkstück 12 bewegen lässt.In Fig. 1 a workpiece carrier 10 is shown, on the upper surface of which a plate-shaped workpiece 12 can be clamped so that its upper surface can be polished. Above the workpiece carrier 10, a polishing portal 14 is arranged, which is linear with the aid of a drive 16, in the direction perpendicular to the plane in Fig. 1 , can move relative to the workpiece carrier 10 and the workpiece 12.

Das Polierportal 14 wird durch beiderseits des Werkstückträgers 10 angeordnete vertikale Säulen 18 und diese verbindende Traversen 20 gebildet und nimmt eine Poliereinheit 22 auf, die in der Höhe verstellbar in dem Polierportal gehalten ist. Die Poliereinheit 22 weist mindestens ein endloses Polierband 24 auf, das über Umlenkrollen 26 umläuft und dessen unterer Trumm 28 durch eine Andruckeinrichtung 30 auf ganzer Länge gegen die Oberfläche des Werkstücks 12 andrückbar ist.The polishing portal 14 is formed by arranged on both sides of the workpiece carrier 10 vertical columns 18 and these connecting trusses 20 and receives a polishing unit 22, which is held adjustable in height in the polishing portal. The polishing unit 22 has at least one endless polishing belt 24, which rotates about deflection rollers 26 and whose lower run 28 is pressed by a pressure device 30 over its entire length against the surface of the workpiece 12.

Eine der Umlenkrollen 26 ist durch einen Motor 34 und ein zugehöriges Getriebe angetrieben. Der Motor 34, die Umlenkrollen 26 und die Andruckeinrichtung 30 sind an Konsolen 36 gehalten, die ihrerseits an vertikalen Schirmplatten 38 befestigt sind. Die Schirmplatten 38 schließen die Poliereinheit 22 auf beiden Seiten ab und sind durch Traversen 40 verbunden, so dass sie ein Gestell bilden. Dieses Gestell ist mit Hilfe von Kugelbuchsen oder Spindelmuttern 42 und zugehörigen Spindeln 44 (Fig. 2) in dem Polierportal 14 gehalten.One of the deflection rollers 26 is driven by a motor 34 and an associated gear. The motor 34, the deflection rollers 26 and the pressure device 30 are held on brackets 36, which in turn are attached to vertical screen plates 38. The shield plates 38 terminate the polishing unit 22 on both sides and are connected by traverses 40 so as to form a frame. This frame is by means of ball bushings or spindle nuts 42 and associated spindles 44 ( Fig. 2 ) held in the polishing portal 14.

Wie deutlicher in Fig. 2 zu erkennen ist, sind die Säulen 18 des Polierportals, die sich auf derselben Seite des Werkstückträgers 10 befinden (und von denen deshalb in Fig. 1 jeweils nur eine zu erkennen ist) an den oberen Enden durch Brücken 46 und an den unteren Enden durch Fußplatten 48 miteinander verbunden. Weiterhin erkennt man in Fig. 2, dass die Poliereinheit 22 zwei parallele Polierbänder 28 mit jeweils zugehörigen Antriebs- und Andruckeinrichtungen aufweist.How clearer in Fig. 2 can be seen, the columns 18 of the polishing portal, which are located on the same side of the workpiece carrier 10 (and of which therefore in Fig. 1 only one can be seen) at the upper ends by bridges 46 and at the lower ends by foot plates 48 connected to each other. Furthermore one recognizes in Fig. 2 in that the polishing unit 22 has two parallel polishing belts 28, each with associated drive and pressure devices.

Die Spindeln 44 sind jeweils in der Brücke 46 und in einer auf der Fußplatte 48 gehaltenen Antriebseinheit 50 gelagert. Zwischen der Brücke 46 und der Fußplatte 48 verlaufen außerdem auf jeder Seite zwei Führungsstangen 52, an denen die Schirmplatten 38 mit Führungsbuchsen 54 geführt sind. Durch Drehantrieb der Spindeln 44 lässt sich somit die Höhe der Poliereinheit 22 präzise an die jeweilige Dicke des Werkstücks 12 anpassen.The spindles 44 are respectively mounted in the bridge 46 and in a drive unit 50 held on the base plate 48. Between the bridge 46 and the foot plate 48 run In addition, on each side two guide rods 52 on which the screen plates 38 are guided with guide bushes 54. By rotationally driving the spindles 44, the height of the polishing unit 22 can thus be adapted precisely to the respective thickness of the workpiece 12.

Die Fußplatten 48 des Polierportals stützen sich jeweils verstellbar auf einer Trägerplatte 56 ab, die in der in Fig. 2 durch einen Doppelpfeil X angegebenen Richtung verschiebbar an dem Werkstückträger 10 geführt ist. Bei dem Antrieb 16 kann es sich um irgendeinen geeigneten Linearantrieb handeln, im gezeigten Beispiel einen Riementrieb, mit dem sich die Fußplatten 56 und damit das gesamte Polierportal 14 hin- und hergehend in der Richtung X bewegen lässt. In einer alternativen Ausführungsform könnte auch das Polierportal 14 stationär und statt dessen der Werkstückträger 10 beweglich sein. In dem Fall könnte der Werkstückträger auch ein Förderer sein, auf dem die Werkstücke nur in einer Richtung durch das Polierportal hindurch laufen.The base plates 48 of the polishing portal are each supported on a support plate 56 adjustable in the in Fig. 2 slidably guided by a double arrow X direction on the workpiece carrier 10. The drive 16 may be any suitable linear drive, in the example shown a belt drive with which the foot plates 56 and thus the entire polishing portal 14 can be moved back and forth in the direction X. In an alternative embodiment, the polishing portal 14 could be stationary and instead of the workpiece carrier 10 to be movable. In that case, the workpiece carrier could also be a conveyor on which the workpieces pass in one direction only through the polishing portal.

Wie in Fig. 1 zu erkennen ist, erstrecken sich die Polierbänder 24 jeweils über die gesamte Breite des Werkstücks 12, d. h. die Positionen der Umlenkrollen 26 bestimmen die maximale Breite der Werkstücke, die auf den Werkstückträger 10 aufgespannt werden können. Um zu verhindern, dass die Kanten des Werkstücks durch das Polierband zu stark abgeschliffen werden, sind diese Kanten durch Schutzleisten 58 geschützt, die an der Oberseite mit der Werkstückoberfläche bündig sind.As in Fig. 1 can be seen, the polishing belts 24 each extend over the entire width of the workpiece 12, that is, the positions of the guide rollers 26 determine the maximum width of the workpieces, which can be clamped onto the workpiece carrier 10. In order to prevent that the edges of the workpiece are ground off too much by the polishing belt, these edges are protected by protective strips 58, which are flush with the workpiece surface at the top.

Der Aufbau der Andruckeinrichtung 30 soll nun mit Bezug auf Fig. 3 näher beschrieben werden. Der obere Trumm des Schleifbandes 24 ist auf einer Platte 60 geführt, an die sich nach unten ein trapezförmiger, nach unten offener Kasten 62 anschließt. An der Unterseite dieses Kastens verläuft parallel zu dem unteren Trumm 28 des Polierbandes 24 ein Lamellenband 64, das an beiden Enden des Kastens an Umlenkrollen 66 umgelenkt wird und nach Art eines Rollos auf Aufrolleinrichtungen 68 aufgenommen ist. Mit Hilfe eines nicht gezeigten Antriebs werden die Aufrolleinrichtungen 68 so angetrieben, dass das Lamellenband 64 in eine oszillierende Bewegung parallel zu dem Polierband 24 versetzt wird. Das Lamellenband trägt an seiner Unterseite Lamellen 70, die auf den unteren Trumm 28 des Polierbandes drücken. Fig. 4 zeigt einen Abschnitt des Lamellenbandes 64 in einer Ansicht von unten und lässt die Konfiguration der Lamellen 70 erkennen, die hier die Form von einander überlappenden Winkeln haben und beispielsweise aus Filz bestehen.The construction of the pressing device 30 will now be described with reference to FIG Fig. 3 be described in more detail. The upper run of the abrasive belt 24 is guided on a plate 60, followed by a trapezoidal, downwardly open box 62 connects down. At the bottom of this box runs parallel to the lower run 28 of the polishing belt 24, a slat belt 64, which is deflected at both ends of the box on pulleys 66 and is accommodated on retractors 68 in the manner of a roller blind. By means of a drive, not shown, the retractors 68 are driven so that the fin belt 64 in an oscillating movement parallel to the polishing belt 24 is offset. The slat band carries on its underside slats 70, which press on the lower run 28 of the polishing belt. Fig. 4 shows a portion of the fin strip 64 in a view from below and reveals the configuration of the fins 70, here in the form of overlapping angles and for example made of felt.

Oberhalb des Lamellenbandes 64 ist in dem Kasten 62 ein aufblasbarer Luftsack 72 angeordnet, der sich mit seiner Oberseite an Widerlagern 74 abstützt und folglich mit seiner Unterseite auf ganzer Länge gleichmäßig gegen das Lamellenband 64 andrückt und dieses mit dem unteren Trumm 28 des Polierbandes in Reibberührung hält. Durch Regelung des Druckes in dem Luftsack 70 (wahlweise auch durch Messung dieses Druckes und Höhenverstellung der gesamten Poliereinheit) kann somit der Anpressdruck des Lamellenbandes 64 präzise kontrolliert werden. Die Lamellen 70 geben diesen Anpressdruck auf das Polierband 24 und letztlich auf die Werkstückoberfläche weiter, so dass das Polierband auf ganzer Länge gleichmäßig gegen die Oberfläche des Werkstücks angedrückt wird. Durch die oszillierende Bewegung des Lamellenbandes werden dabei lokale Schwankungen des Anpressdruckes verwischt, die durch die einzelnen Lamellen hervorgerufen werden.Above the lamellar band 64, an inflatable air bag 72 is disposed in the box 62, which is supported with its upper side abutments 74 and consequently uniformly presses with its underside over the entire length against the slat band 64 and keeps it in frictional contact with the lower run 28 of the polishing belt , By controlling the pressure in the airbag 70 (optionally also by measuring this pressure and height adjustment of the entire polishing unit), thus, the contact pressure of the fin belt 64 can be precisely controlled. The lamellae 70 pass this contact pressure on the polishing belt 24 and ultimately on the workpiece surface, so that the polishing belt is pressed evenly over its entire length against the surface of the workpiece. Due to the oscillating movement of the lamella belt, local fluctuations in the contact pressure caused by the individual lamellae are blurred.

Bevorzugt ist zwischen dem Luftsack 72 und dem Lamellenband 64 noch ein dünnes, stationäres Blech angeordnet (in der Zeichnung nicht sichtbar), das den Druck überträgt und gegen Reibung schützt.Preferably, between the air bag 72 and the slat belt 64 is still a thin, stationary sheet arranged (not visible in the drawing), which transmits the pressure and protects against friction.

Über eine Luftzuführung 76, die an ein nicht gezeigtes Gebläse und gegebenenfalls ein Kühlaggregat anschlossen ist, kann Kühlluft in den Kasten 62 eingeleitet werden. Diese Kühlluft umströmt den Luftsack 72 und tritt an der Unterseite aus dem Kasten 62 aus und kühlt dabei das Lamellenband 64 und das Polierband 24, so dass die beim Polieren entstehende Reibungswärme wirksam abgeführt werden kann.Cooling air can be introduced into the box 62 via an air supply 76, which is connected to a blower (not shown) and optionally a cooling unit. This cooling air flows around the airbag 72 and exits at the bottom of the box 62 and thereby cools the fin belt 64 and the polishing belt 24, so that the frictional heat generated during polishing can be effectively dissipated.

Zum Polieren kann wie üblich eine Polierpaste auf die Oberfläche des Werkstücks 12 aufgetragen werden. Diese Polierpaste wird dann durch das Polierband 24 verrieben. Im gezeigten Beispiel ist über dem oberen Trumm des Polierbandes 24 eine Düse 78 angeordnet, mit der eine Flüssigkeit auf das Polierband 24 aufgebracht werden kann, die dann mit einer Rakel 80 auf der Oberfläche des Polierbandes verstrichen wird. Diese Flüssigkeit dient zur Verdünnung der Polierpaste und trägt zugleich zur Kühlung des Polierbandes bei. Die durch die Flüssigkeit verdünnte Polierpaste und der beim Polieren entstehende Abrieb werden durch den unteren Trumm 28 des Polierbandes mitgenommen (nach rechts in Fig. 3) und an der Umlenkrolle 26 durch Fliehkraftwirkung weggeschleudert. Das weggeschleuderte Material wird jedoch durch die Schirmplatte 38 der Poliereinheit aufgefangen. Da die Schirmplatten 38 auf beiden Seiten der Poliereinheit angeordnet sind, können die beiden in Fig. 2 gezeigten Polierbänder 24 wahlweise auch gegensinnig angetrieben werden.For polishing, as usual, a polishing paste can be applied to the surface of the workpiece 12. This polishing paste is then rubbed by the polishing belt 24. In the example shown above the upper run of the polishing belt 24, a nozzle 78 is arranged, with which a liquid can be applied to the polishing belt 24, which is then passed with a doctor blade 80 on the surface of the polishing belt. This liquid serves to dilute the polishing paste and at the same time contributes to the cooling of the polishing belt. The polishing paste diluted by the liquid and the abrasion resulting from the polishing are carried along by the lower run 28 of the polishing belt (to the right in FIG Fig. 3 ) and on the guide roller 26 thrown by centrifugal force. However, the flung-off material is caught by the screen plate 38 of the polishing unit. Since the screen plates 38 are arranged on both sides of the polishing unit, the two can in Fig. 2 optionally shown polishing belts 24 are also driven in opposite directions.

In Fig. 5 ist die Poliermaschine in einem schematischen Grundriss gezeigt, jedoch in einer Konfiguration, in der die Polierbänder 24 nicht genau rechtwinklig zu der Richtung X der Relativbewegung zwischen dem Werkstückträger 10 und dem Polierportal 14 verlaufen, sondern etwas schräg angestellt sind, beispielsweise unter einem Winkel von 7°. Wenn das Werkstück 12 zuvor mit einer Schleifmaschine geschliffen wurde, die in der zu polierenden Oberfläche Schleifspuren hinterlassen hat, die rechtwinklig zu der Richtung X verlaufen, so wird durch die Schrägstellung der Polierbänder 24 sichergestellt, dass diese Schleifspuren im Polierprozess verwischt werden können. Außerdem erleichtert es diese Schrägstellung, das Polierportal über die in Fig. 5 rechten und linken Enden des Werkstücks 12 hinaus zu bewegen, so dass auch die Endbereiche des Werkstücks mit gleicher Intensität poliert werden können wie der zentrale Bereich, ohne dass sich die Polierbänder an den Kanten des Werkstücks verfangen.In Fig. 5 The polishing machine is shown in a schematic plan view, but in a configuration in which the polishing belts 24 are not exactly perpendicular to the direction X of the relative movement between the workpiece carrier 10 and the polishing portal 14, but are made somewhat obliquely, for example at an angle of 7 °. If the workpiece 12 has previously been ground with a grinding machine that has left in the surface to be polished grinding marks that are perpendicular to the direction X, so is ensured by the inclination of the polishing belts 24 that these grinding marks can be blurred in the polishing process. In addition, it facilitates this inclination, the polishing portal on the in Fig. 5 move right and left ends of the workpiece 12 out so that also the end portions of the workpiece can be polished with the same intensity as the central area, without the polishing tapes caught on the edges of the workpiece.

Weiterhin erkennt man in Fig. 5, dass die Fußplatten 48 des Schleifportals mit Stiften 82 fixiert sind, die in entsprechende Löcher 84 der Trägerplatten 56 eingreifen. Da jedoch in den Trägerplatten 56 mehrere Sätze von Löchern 84 angeordnet sind, lässt sich der Anstellwinkel der Polierbänder 24 relativ zum Werkstück 12 nach Bedarf variieren. Unter anderem ist auch eine rechtwinklige Ausrichtung der Polierbänder 24 relativ zu der Richtung X möglich, beispielsweise für den Fall, dass die Schleifspuren auf der Werkstückoberfläche in der Richtung X verlaufen oder für den Fall, dass das Polierportal 14 mit einer im Vergleich zur Geschwindigkeit der Polierbänder 24 relativ hohen Geschwindigkeit in der Richtung X bewegt wird, so dass sich ein Schräglauf der Polierbänder relativ zum Werkstück 12 durch die Überlagerung der beiden Bewegungen ergibt.Furthermore one recognizes in Fig. 5 in that the foot plates 48 of the sanding portal are fixed with pins 82 which engage in corresponding holes 84 of the support plates 56. However, since a plurality of sets of holes 84 are arranged in the support plates 56, can be the angle of attack of the polishing belts 24 relative to the workpiece 12 may vary as needed. Among other things, a perpendicular orientation of the polishing belts 24 relative to the direction X is possible, for example, in the case that the grinding marks on the workpiece surface in the direction X or in the event that the polishing portal 14 with a compared to the speed of the polishing belts 24 relatively high speed in the direction X is moved, so that a skew of the polishing belts relative to the workpiece 12 results from the superposition of the two movements.

In einer modifizierten Ausführungsform ist es auch möglich, dass die beiden Polierbänder 24 oder, allgemeiner, die mehreren Polierbänder, nicht parallel zueinander verlaufen, sondern einen Winkel miteinander bilden. Gegebenenfalls können die Winkelstellungen der einzelnen Polierbänder auch unabhängig voneinander einstellbar sein.In a modified embodiment, it is also possible that the two polishing belts 24 or, more generally, the plurality of polishing belts, do not run parallel to one another but form an angle with one another. Optionally, the angular positions of the individual polishing belts can also be adjusted independently of one another.

Claims (14)

Poliermaschine zum Polieren von Werkstücken (12) mit ebener Oberfläche, mit einem Werkstückträger (10), einem über dem Werkstückträger angeordneten Polierportal (14), das linear relativ zu dem Werkstückträger (10) bewegbar ist, und einem Antrieb (16) zum Erzeugen einer Relativbewegung zwischen dem Polierportal und dem Werkstückträger, dadurch gekennzeichnet, dass das Polierportal (14) ein endlos umlaufendes Polierband (24) aufweist, das in einer Richtung, die einen Winkel mit der Richtung (X) der Relativbewegung bildet, über die gesamte Breite des Werkstückes (12) verläuft und dessen unterer Trumm (28) durch eine Andruckeinrichtung (30) gegen die Oberfläche des Werkstücks (12) andrückbar ist.Polishing machine for polishing workpieces (12) with a flat surface, comprising a workpiece carrier (10), a polishing portal (14) arranged above the workpiece carrier, which is linearly movable relative to the workpiece carrier (10), and a drive (16) for producing a Relative movement between the polishing portal and the workpiece carrier, characterized in that the polishing portal (14) has an endlessly circulating polishing belt (24) which in a direction which forms an angle with the direction (X) of the relative movement over the entire width of the workpiece (12) and whose lower run (28) can be pressed by a pressure device (30) against the surface of the workpiece (12). Poliermaschine nach Anspruch 1, bei der sämtliche Polierorgane des Polierportals (14) durch ein oder mehrere Polierbänder (24) gebildet werden.A polishing machine according to claim 1, wherein all the polishing members of the polishing gantry (14) are formed by one or more polishing belts (24). Poliermaschine nach Anspruch 1 oder 2, bei der die Andruckeinrichtung (30) ein parallel zum unteren Trumm (28) des Polierbandes (24) verlaufendes Lamellenband (64) aufweist, das mit gegen die Oberfläche des Polierbandes andrückenden Lamellen (70) bestückt ist.A polishing machine according to claim 1 or 2, wherein the pressing means (30) comprises a lamellar band (64) extending parallel to the lower run (28) of the polishing belt (24) and fitted with louvers (70) pressing against the surface of the polishing belt. Poliermaschine nach Anspruch 3, bei der das Lamellenband (64) oszillierend antreibbar ist.Polishing machine according to claim 3, wherein the lamellar belt (64) is driven to oscillate. Poliermaschine nach Anspruch 4, bei der das Lamellenband (64) an beiden Enden des unteren Trumms (28) des Polierbandes auf Aufrolleinrichtungen (68) aufrollbar ist.A polishing machine according to claim 4, wherein the fin strip (64) is rollable on retractors (68) at both ends of the lower run (28) of the polishing belt. Poliermaschine nach einem der vorstehenden Ansprüche, bei der die Andruckeinrichtung (30) einen aufblasbaren Luftsack (72) aufweist, der mittelbar oder unmittelbar gegen den unteren Trumm (28) des Polierbandes (24) drückt.A polishing machine as claimed in any one of the preceding claims, wherein the pressure means (30) comprises an inflatable air bag (72) which presses directly or indirectly against the lower run (28) of the polishing belt (24). Poliermaschine nach einem der vorstehenden Ansprüche, mit einer Kühleinrichtung (76) zum Kühlen des Polierbandes (24).A polishing machine according to any one of the preceding claims, including cooling means (76) for cooling the polishing belt (24). Poliermaschine nach Anspruch 7, bei der die Kühleinrichtung eine Luftzuführung (76) zum Zuführen von Kühlluft zu dem unteren Trumm (28) des Polierbandes (24) aufweist.A polishing machine according to claim 7, wherein the cooling means comprises an air supply (76) for supplying cooling air to the lower run (28) of the polishing belt (24). Poliermaschine nach einem der vorstehenden Ansprüche, bei der das Polierband (24) schräg zu der Richtung (X) der Relativbewegung zwischen Werkstückträger (10) und Polierportal (14) verläuft.A polishing machine according to any one of the preceding claims, wherein the polishing belt (24) extends obliquely to the direction (X) of relative movement between the workpiece carrier (10) and the polishing portal (14). Poliermaschine nach Anspruch 9, bei der der Anstellwinkel des Polierbandes (24) einstellbar ist,A polishing machine according to claim 9, wherein the angle of attack of the polishing belt (24) is adjustable, Poliermaschine nach einem der vorstehenden Ansprüche, bei der das Polierband (24) in einer Poliereinheit (22) gehalten ist, die höhenverstellbar in dem Polierportal (14) gehalten ist,A polishing machine according to any one of the preceding claims, wherein the polishing belt (24) is held in a polishing unit (22) which is height-adjustably held in the polishing portal (14), Poliermaschine nach Anspruch 11, bei der die Poliereinheit (22) oder das Polierportal (14) an mindestens einem Ende des Polierbandes (24) durch eine Schirmplatte (38) abgeschlossen ist.A polishing machine according to claim 11, wherein the polishing unit (22) or the polishing portal (14) is terminated at at least one end of the polishing belt (24) by a screen plate (38). Poliermaschine nach Anspruch 11 oder 12, mit einem Spindelantrieb (44, 50) zur Höhenverstellung der Poliereinheit (22) relativ zu dem Polierportal (14).Polishing machine according to claim 11 or 12, having a spindle drive (44, 50) for adjusting the height of the polishing unit (22) relative to the polishing portal (14). Poliermaschine nach einem der vorstehenden Ansprüche, mit einer Düse (78) zum Auftragen einer Flüssigkeit oder Paste auf das Polierband (24).A polishing machine according to any one of the preceding claims, including a nozzle (78) for applying a liquid or paste to the polishing belt (24).
EP10156897A 2009-05-13 2010-03-18 Polishing machine with a polishing belt and contact pressure element Withdrawn EP2251139A3 (en)

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