EP0249890A1 - Sanding machine, in particular profile sanding machine - Google Patents

Sanding machine, in particular profile sanding machine Download PDF

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Publication number
EP0249890A1
EP0249890A1 EP87108438A EP87108438A EP0249890A1 EP 0249890 A1 EP0249890 A1 EP 0249890A1 EP 87108438 A EP87108438 A EP 87108438A EP 87108438 A EP87108438 A EP 87108438A EP 0249890 A1 EP0249890 A1 EP 0249890A1
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European Patent Office
Prior art keywords
rollers
belt
grinding
roller
rotation
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EP87108438A
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German (de)
French (fr)
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Michael Braun
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Individual
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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
    • 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
    • B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
    • B24B21/14—Contact wheels; Contact rollers; Belt supporting rolls
    • 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
    • B24B21/18—Accessories

Definitions

  • the invention relates to a grinding machine, in particular a profile grinding machine, with a grinding belt which preferably rotates endlessly around roller arrangements, which is preferably profiled by means of a profiled grinding shoe which rests on the back of the grinding belt in accordance with the shape of the workpiece to be ground, with at least one roller arrangement at least two essentially transverse to the direction of travel the abrasive belt has adjacent, rotatable rollers on which the abrasive belt rests over a large part of its width.
  • Profile grinding machines of this type often have cylindrical deflection and drive disks with parallel axes, against which the mostly textile abrasive belt rests with its rear side.
  • a problem arises here in profiling the sanding belt from its flat shape (in contact with the deflection or drive disks) with each revolution in accordance with the profile of the sanding shoe, so that it lies snugly against the profiled sanding shoe.
  • it has already been proposed to suck in the grinding belt on the grinding shoe by means of negative pressure or to use deflection and drive disks profiled according to the profile of the grinding shoe.
  • Such profiled washers contact washers
  • profiled deflection and drive disks are used, it is disadvantageous, among other things, that these disks are used for grinding shoes with a different profile or for grinding work with a different profile pieces have to be replaced in order to always proliferate according to the profile of the grinding shoe or workpiece being used.
  • the grinding belt or its mostly textile base is weakened rapidly during operation due to the permanent changes in shape of the grinding belt .
  • the grinding belt flutters and, especially at high belt speeds, the grinding belt is thrown over and tangled, which makes further grinding with this bench impossible.
  • the object of the invention is to provide a grinding machine of the type mentioned at the outset, in which a tight fit of the grinding belt on the profiled grinding shoe or the contact disk and a perfect guidance without throwing and entangling the same is ensured over a large number of cycles. This should also be ensured if the base of the grinding belt has already been weakened by the permanent changes in shape, especially in the area of the grinding shoe or the contact disk. According to the invention, this is achieved in that the axes of rotation of the adjacent rollers belonging to a respective roller arrangement are inclined relative to one another.
  • roller arrangements lying on both sides of the grinding shoe will advantageously be designed according to the invention.
  • the abrasive belt lying on the roller arrangement according to the invention over a certain deflection angle range undergoes a continuous profile change due to the mutually inclined axes of rotation of the adjacent rollers.
  • the grinding is running just taped onto the roller arrangement according to the invention, the rollers forming a flat profile at the point of impact and at least over a large part of the sanding belt width lie flat against the sanding belt, and leaves the roller arrangement with an approximately convex profile. It is essential that during the entire continuous change in the profile of the grinding belt on the roller arrangement, this abuts the rollers over a large part of its width. A continuous pulling apart of the grinding belt transversely to its running direction or a smoothing of the belt is thus achieved. Throw-overs and entanglements of the sanding belt are successfully prevented even with a weakened base and high belt speeds.
  • a smoothing effect can also be achieved by pre-profiling the grinding belt similar to the profiling of a grinding shoe or a profiled contact disk.
  • roller arrangement according to the invention can be used instead of the previous deflection or drive pulleys.
  • the angle that the axes of rotation of the rollers of the roller arrangement enclose is adjustable.
  • Another preferred embodiment of the subject matter of the invention serves the same purpose, which consists in the fact that the axes of rotation of the outer rollers of the roller arrangement extend beyond them and are each articulated on a machine-fixed holder, the entire roller arrangement being one of the two Bearing points of the axes of rotation on the bracket connecting imaginary axis is pivotable.
  • the angle of the axes of rotation of the rollers that is to say the roller arrangement as such, can remain fixed, and the entire roller arrangement can be rotated relative to the holder, which results in a different effective profiling of the entire roller arrangement due to the inclined axes of rotation.
  • a favorable embodiment in which a simple adjustment of the roller arrangement relative to the holder is possible, consists in that the axis of rotation of at least one roller of the roller arrangement is guided through a rotationally symmetrical bore of the holder, with an axis of rotation, spherical layer-shaped on the inner edge of the bore facing the rollers Surface rests and a nut with a spherical layer-shaped facing the bore Surface is provided which can be screwed onto a thread of the axis of rotation against the outer edge of the bore. If the nut is loose, the roller assembly can be pivoted against the bracket by hand. The nut is then tightened, as a result of which the spherical-layer-shaped surfaces abut firmly on the outer and inner edge of the bore and the position of the axes of rotation with the holder is thus fixed.
  • a roller arrangement with three rollers has proven itself, the width of the two outer rollers preferably being at least three times the width of the central rollers and the central roller being essentially symmetrical to the two outer rollers. It is advantageous if the outer rollers of the roller arrangement are conical with an outwardly decreasing diameter and the central roller is essentially cylindrical, preferably slightly cambered, the contact surface of the central roller radially at least partially over the imaginary connecting surface between the contact surfaces of the outer rollers survives. The middle role takes over a guiding function for the sanding belt, which is always looking for the highest (radially largest) role point.
  • the slots between the rollers resulting from inclined axes of rotation can be restricted to a minimum width.
  • FIG. 1 shows a highly schematic plan view of a profile grinding machine according to the invention and
  • FIG. 2 shows a sectional view of a roller arrangement according to the invention.
  • a textile grinding belt 10 has a large cylindrical drive disc 1, five roller arrangements 2, 3, 4, 5 and 6 according to the invention, as are shown in more detail in FIG. 2, and a profiled grinding shoe 7 in a substantially horizontal plane.
  • the workpiece to be ground (not shown) is guided past the profiled grinding shoe 7 on the grinding table 8.
  • the textile grinding belt 10 experiences a maximum deflection of approximately 70 ° per roller arrangement. With each revolution, the grinding belt 10 lies flat against the cylindrical drive pulley 1 (ie without profiling transversely to the belt running direction) and abuts against the grinding shoe 7 about half a revolution later according to the profile of the grinding shoe 7.
  • roller arrangement 2 to 6 which will be described in more detail below with reference to FIG. 2, continuously pull the sanding belt apart transversely to the belt running direction and thus prevent the weakened textile sanding belt 10 from being thrown over and tangled even at high belt speeds.
  • these roller assemblies 2 to 6 help to protect the sanding belt by continuously changing the profiling of the sanding belt 10 on the roller assemblies 2 to 6 under continuous, full contact over a large part of its width, so that the sanding belt 10 is weakened less from the outset than with conventional tape guides.
  • FIG. 2 shows a roller arrangement according to the invention with three rotatable rollers 11, 12 and 13 made of aluminum lying next to one another transversely to the running direction of the grinding belt (not shown here), the axes of rotation 11a, 12a and 13a of which are inclined to one another.
  • an abrasive belt resting on these rollers 11, 12 and 13 has a different profile, as a result of which its profile changes continuously along the contact surface in the direction of the belt run.
  • the axes of rotation 11a and 12a of the external, conical rollers 11 and 12 are extended outwards beyond them and are each articulated on a holder 14 which is fixed during operation.
  • the three rollers 11, 12 and 13 can be pivoted as a whole without changing their mutual rotational axis position about an imaginary axis 17 connecting the two bearing points 15, 16, and thus the effective profiling resting on the grinding belt can be adjusted.
  • the axis of rotation 12a is guided through a cylindrical bore 18 in the holder 14. At the inner edge of this bore 18 there is a surface 19 which is fixed in the form of a spherical axis and is fixed to the axis of rotation.
  • a nut 20 can be screwed from the outside with its also spherical layer-shaped surface 21 on a thread of the axis of rotation 12a against the outer edge of the bore 18 and thus the position of the roller arrangement relative to the holder 14 can be adjusted.
  • An adaptation to different types of bands and profiles of the exchangeable grinding shoe 7 is thus easily possible.
  • the rollers 11 and 12 are slightly conical and touch the small, middle roller 13, which as Serves as a leading role. As in the exemplary embodiment shown, this can be cylindrical. However, it is also possible that the central roller 13 is slightly cambered and partially protrudes radially beyond the imaginary connecting surface between the contact surfaces of the outer rollers 11, 12, with the result that better tape guidance can be achieved.
  • the rollers of a roller assembly can also be adjusted by adjusting the angle between the individual axes of rotation.
  • the rollers themselves can be profiled or cylindrical and can be made of materials other than aluminum, in particular plastic. It is also conceivable to at least partially drive the rollers of the roller arrangement according to the invention. In principle, it is also possible for the rollers to rest on the grinding side of the grinding belt in certain applications. The number of rolls per roll arrangement can also be different from three.

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

Abstract

The sanding machine has a sanding belt (10) which preferably rotates endlessly around roller arrangements (2, 3, 4, 5, 6) and is profiled in accordance with the shape of the work piece to be sanded by means of a profiled sanding shoe (7) bearing against the rear side of the sanding belt. Roller arrangements are provided at least on either side of the sanding shoe (7) in order to guide and deflect the sanding belt (10). The roller arrangements have, for example, in each case three rollers (11, 12, 13) lying next to one another transversely to the running direction of the sanding belt (10). The sanding belt (10) bears on the rollers (11, 12, 13) over a large part of its width. In this arrangement, the rotational axes (11a, 12a, 13a) of the rollers (11, 12, 13) are inclined relative to one another, as a result of which the bearing sanding belt (10) undergoes a continual change in profile when in full contact in the running direction of the belt and at the same time is slightly stretched transversely to the running direction of the belt. <IMAGE>

Description

Die Erfindung betrifft eine Schleifmaschine, insbesondere Profilschleifmaschine, mit einem vorzugsweise endlos um Rollenanordnungen umlaufenden Schleifband, welches vor­zugsweise mittels eines an der Schleifbandrückseite an­liegenden, profilierten Schleifschuhs entsprechend der Form des zu schleifenden Werkstückes profiliert wird, wobei zumindest eine Rollenanordnung wenigstens zwei im wesentlichen quer zur Laufrichtung des Schleifbandes nebeneinanderliegende, drehbare Rollen aufweist, an denen das Schleifband auf einem Großteil seiner Breite anliegt.The invention relates to a grinding machine, in particular a profile grinding machine, with a grinding belt which preferably rotates endlessly around roller arrangements, which is preferably profiled by means of a profiled grinding shoe which rests on the back of the grinding belt in accordance with the shape of the workpiece to be ground, with at least one roller arrangement at least two essentially transverse to the direction of travel the abrasive belt has adjacent, rotatable rollers on which the abrasive belt rests over a large part of its width.

Derartige Profilschleifmaschinen weisen häufig zylindrische Umlenk- und Antriebsscheiben mit parallelen Achsen auf, an denen das meist textile Schleifband mit seiner Rückseite anliegt. Ein Problem stellt sich dabei, das Schleifband aus seiner ebenen Form (Anlage an den Umlenk- bzw. Antriebsscheiben) bei jedem Umlauf entsprechend dem Profil des Schleifschuhs zu profilieren, sodaß es satt am profilierten Schleifschuh anliegt. Um diese Profilierung am Schleifschuh zu erreichen, wurde bereits vorgeschlagen, das Schleifband am Schleifschuh mittels Unterdruck anzusaugen oder gemäß dem Profil des Schleifschuhs profilierte Umlenk- und Antriebsscheiben zu verwenden. An solchen profilierten Scheiben (Kontakt­scheiben) könnte u.U. direkt ohne Verwendung von profilierten Schleifschuhen geschliffen werden. Weiters ist es bei scharfkantigen Schleifschuhprofilierungen bekannt, ver­stellbare Hilfsrollenpaare zwischen den zylindrischen Umlenk- bzw. Antriebsscheiben einerseits und dem Schleif­schuh andererseits vorzusehen, die auf einem kleinen Teil der Schleifseite des Schleifbandes anliegen und dieses über die Profilierung des Schleifschuhs hinaus zusammen­falten, um dann eine satte Anlage am Schleifschuh zu gewährleisten.Profile grinding machines of this type often have cylindrical deflection and drive disks with parallel axes, against which the mostly textile abrasive belt rests with its rear side. A problem arises here in profiling the sanding belt from its flat shape (in contact with the deflection or drive disks) with each revolution in accordance with the profile of the sanding shoe, so that it lies snugly against the profiled sanding shoe. In order to achieve this profiling on the grinding shoe, it has already been proposed to suck in the grinding belt on the grinding shoe by means of negative pressure or to use deflection and drive disks profiled according to the profile of the grinding shoe. Such profiled washers (contact washers) could possibly can be ground directly without using profiled grinding shoes. Furthermore, in the case of sharp-edged grinding shoe profiles, it is known to provide adjustable pairs of auxiliary rollers between the cylindrical deflection or drive disks on the one hand and the grinding shoe on the other, which rest on a small part of the grinding side of the grinding belt and fold it over the profile of the grinding shoe, in order then to provide a full system to ensure on the grinding shoe.

Bei Verwendung von profilierten Umlenk- und Antriebs­scheiben wirkt es sich unter anderem als nachteilig aus, daß diese Scheiben bei anders profilierten Schleif­schuhen bzw. beim Schleifen anders profilierter Werk­ stücke ausgewechselt werden müssen, um immer gemäß dem Profil des gerade verwendeten Schleifschuhs bzw. des Werkstückes prolifiert zu sein. Bei allen bekannten Ausführungen, insbesondere bei der bekannten Anordnung mit den Hilfsrollen, an denen das Band über die Profilierung des Schleifschuhs hinaus verformt wird, kommt es im Betrieb auf Grund der dauernden Formänderungen des Schleifbandes zu einer raschen Schwächung des Schleifbandes bzw. seiner meist textilen Unterlage. In der Folge kommt es zu einem Flattern des Schleifbandes und vor allem bei großen Bandgeschwindig­keiten zu Überwerfungen und Verwicklungen des Schleif­bandes, was ein weiteres Schleifen mit diesem Bank un­möglich macht.If profiled deflection and drive disks are used, it is disadvantageous, among other things, that these disks are used for grinding shoes with a different profile or for grinding work with a different profile pieces have to be replaced in order to always proliferate according to the profile of the grinding shoe or workpiece being used. In all known designs, in particular in the known arrangement with the auxiliary rollers on which the belt is deformed beyond the profiling of the grinding shoe, the grinding belt or its mostly textile base is weakened rapidly during operation due to the permanent changes in shape of the grinding belt . As a result, the grinding belt flutters and, especially at high belt speeds, the grinding belt is thrown over and tangled, which makes further grinding with this bench impossible.

Die Aufgabe der Erfindung besteht darin, eine Schleif­maschine der eingangs genannten Gattund zu schaffen, bei der ein sattes Anliegen des Schleifbandes am profilierten Schleifschuh bzw. der Kontaktscheibe und eine einwandfreie Führung ohne Überwerfungen und Verwicklungen desselben über eine große Zahl von Umläufen gewährleistet ist. Dies soll auch dann sichertgestellt sein, wenn die Unter­lage des Schleifbandes durch die dauernden, vor allem im Bereich des Schleifschuhs bzw. der Kontaktscheibe statt­findenden Formänderungen bereits geschwächt ist. Erfindungsgemäß wird dies dadurch erreicht, daß die Dreh­achsen der zu jeweils einer Rollenanordnung gehörigen, nebeneinanderliegenden Rollen zueinander schräggestellt sind.The object of the invention is to provide a grinding machine of the type mentioned at the outset, in which a tight fit of the grinding belt on the profiled grinding shoe or the contact disk and a perfect guidance without throwing and entangling the same is ensured over a large number of cycles. This should also be ensured if the base of the grinding belt has already been weakened by the permanent changes in shape, especially in the area of the grinding shoe or the contact disk. According to the invention, this is achieved in that the axes of rotation of the adjacent rollers belonging to a respective roller arrangement are inclined relative to one another.

Bei der Verwendung eines profilierten Schleifschuhs werden günstigerweise zumindest die beiderseits des Schleifschuhs liegenden Rollenanordnungen erfindungsgemäß ausgebildet sein.When using a profiled grinding shoe, at least the roller arrangements lying on both sides of the grinding shoe will advantageously be designed according to the invention.

Das über einen bestimmten Umlenkwinkelbereich an der erfindungsgemäßen Rollenanordnung anliegende Schleifband erfährt auf Grund der zueinander schräggestellten Dreh­achsen der nebeneinanderliegenden Rollen eine kontinuier­liche Profiländerung. Beispielsweise läuft das Schleif­ band eben auf die erfindungsgemäß Rollenanordnung auf, wobei die Rollen an der Auftreffstelle insgesamt ein ebenes Profil bilden und zumindest über einen Großteil der Schleifbandbreite eben am Schleifband anliegen, und verläßt die Rollenanordnung etwa konvex profiliert. Wesentlich dabei ist, daß während der ganzen kontinuier­lichen Profilierungsänderung des Schleifbandes an der Rollenanordnung dieses auf einem Großteil seiner Breite an den Rollen anliegt. Man erreicht damit ein kontinuier­liches Auseinanderziehen des Schleifbandes quer zu seiner Laufrichtung bzw. eine Glättung des Bandes. Überwerfungen und Verwicklungen des Schleifbandes werden auch bei geschwächter Unterlage und hohen Bandgeschwindigkeiten erfolgreich verhindert.The abrasive belt lying on the roller arrangement according to the invention over a certain deflection angle range undergoes a continuous profile change due to the mutually inclined axes of rotation of the adjacent rollers. For example, the grinding is running just taped onto the roller arrangement according to the invention, the rollers forming a flat profile at the point of impact and at least over a large part of the sanding belt width lie flat against the sanding belt, and leaves the roller arrangement with an approximately convex profile. It is essential that during the entire continuous change in the profile of the grinding belt on the roller arrangement, this abuts the rollers over a large part of its width. A continuous pulling apart of the grinding belt transversely to its running direction or a smoothing of the belt is thus achieved. Throw-overs and entanglements of the sanding belt are successfully prevented even with a weakened base and high belt speeds.

Zusätzlich zum wesentlichen genannten Auseinanderzieh­bzw. Glätteffekt kann man mit der erfindungsgemäßen Rolleneinheit auch eine der Profilierung eines Schleif­schuhs bzw. einer profilierten Kontaktscheibe ähnliche Vorprofilierung des Schleifbandes erreichen.In addition to the essential pull-apart or. With the roller unit according to the invention, a smoothing effect can also be achieved by pre-profiling the grinding belt similar to the profiling of a grinding shoe or a profiled contact disk.

Die erfindungsgemäße Rollenanordnung kann anstelle der bisherigen Umlenk- bzw. Antriebsscheiben verwendet werden. Es ist aber möglich, die Rollenanordnung der Erfindnung zusätzlich zu herkömmlichen Umlenk- bzw. Antriebsscheiben etwa vor und hinter dem Schleifschuh in den Bandweg einzubauen und an diesen das Schleifband nur wenig umzulenken, jedoch durch Auseinanderziehen quer zur Laufrichtung zu glätten und allenfalls ein wenig vorzuprofilieren.The roller arrangement according to the invention can be used instead of the previous deflection or drive pulleys. However, it is possible to install the roller arrangement of the invention in addition to conventional deflection or drive disks in front of and behind the sanding shoe in the belt path and to deflect the sanding belt only slightly on them, but to smooth them by pulling them apart transversely to the running direction and, if necessary, to profile them a little.

Um die erfindungsgemäße Rollenanordnung einfach und rasch auf die Profilierung des gerade zu schleifenden Werkstückes einstellen zu können, kann gemäß einem bevorzugten Merkmal der Erfindung vorgesehen sein, daß der Winkel, den die Drehachsen der Rollen der Rollen­anordnung einschließen, verstellbar ist.In order to be able to quickly and easily adjust the roller arrangement according to the invention to the profiling of the workpiece to be ground, it can be provided according to a preferred feature of the invention that the angle that the axes of rotation of the rollers of the roller arrangement enclose is adjustable.

Zum selben Zweck dient eine weitere bevorzugte Aus­führungsform des Erfindungsgegenstandes, die darin besteht, daß die Drehachsen der außen liegenden Rollen der Rollenanordnung über diese hinaus nach außen verlängert und jeweils gelenkig an einer im Betrieb maschinenfesten Halterung gelagert sind, wobei die gesamte Rollenanordnung um eine die beiden Lagerstellen der Drehachsen an der Halterung verbindende, gedachte Achse verschwenkbar ist. Bei dieser Ausführungsform kann der Winkel der Dreh­achsen der Rollen, also die Rollenanordnung als solche, fix bleiben, und die gesamte Rollenanordnung gegenüber der Halterung verdreht werden, wodurch sich auf Grund der schräggestellten Drehachsen jeweils eine andere effektive Profilierung der gesamten Rollenanordnung ergibt. Zum Begriff der effektiven Profilierung der Rollenanordnung im Sinne der Erfindung wird noch folgendes ausgeführt: Durch die Schrägstellung der Rollen zueinander ergeben sich schmale, im Querschnitt keilförmige Schlitze, in die das Schleifband jedoch nicht eindringt. Unter effektiver Profilierung wird im wesentlichen jene von der Umfangslage abhängige Profilierung verstanden, die das über die genannten Schlitze hinweg an den Rollenflächen anliegende Schleif­band erfährt.Another preferred embodiment of the subject matter of the invention serves the same purpose, which consists in the fact that the axes of rotation of the outer rollers of the roller arrangement extend beyond them and are each articulated on a machine-fixed holder, the entire roller arrangement being one of the two Bearing points of the axes of rotation on the bracket connecting imaginary axis is pivotable. In this embodiment, the angle of the axes of rotation of the rollers, that is to say the roller arrangement as such, can remain fixed, and the entire roller arrangement can be rotated relative to the holder, which results in a different effective profiling of the entire roller arrangement due to the inclined axes of rotation. With regard to the concept of the effective profiling of the roller arrangement in the sense of the invention, the following is carried out: The inclined position of the rollers relative to one another results in narrow slots which are wedge-shaped in cross section, but into which the grinding belt does not penetrate. Effective profiling is essentially understood to mean that profiling which is dependent on the circumferential position and which is experienced by the abrasive belt which abuts the roller surfaces over the slots mentioned.

Eine günstige Ausführung, bei der eine einfache Ver­stellung der Rollenanordnung gegenüber der Halterung möglich ist, besteht darin, daß die Drehachse zumindest einer Rolle der Rollenanordnung durch eine rotationssymmetrische Bohrung der Halterung geführt ist, wobei an dem den Rollen zu­gewandten Innenrand der Bohrung eine drehachsenfeste, kugelschichtförmige Fläche anliegt und eine Mutter mit einer zur Bohrung weisenden kugelschichtförmigen Fläche vorgesehen ist, die auf einem Gewinde der Drehachse gegen den Außenrand der Bohrung schraubbar ist. Bei loser Mutter kann die Rollenanordnung von Hand gegen die Halterung verschwenkt werden. Dann wird die Mutter angezogen, wodurch die genannten kugelschicht­förmigen Flächen am Außen- und Innenrand der Bohrung fest anliegen und damit die Lage der Drehachsen zur Halterung fixiert ist.A favorable embodiment, in which a simple adjustment of the roller arrangement relative to the holder is possible, consists in that the axis of rotation of at least one roller of the roller arrangement is guided through a rotationally symmetrical bore of the holder, with an axis of rotation, spherical layer-shaped on the inner edge of the bore facing the rollers Surface rests and a nut with a spherical layer-shaped facing the bore Surface is provided which can be screwed onto a thread of the axis of rotation against the outer edge of the bore. If the nut is loose, the roller assembly can be pivoted against the bracket by hand. The nut is then tightened, as a result of which the spherical-layer-shaped surfaces abut firmly on the outer and inner edge of the bore and the position of the axes of rotation with the holder is thus fixed.

Bei Versuchen hat sich eine Rollenanordnung mit drei Rollen bewährt, wobei die Breite der beiden äußeren Rollen vorzugsweise jeweils mindestens das Dreifache der Breite der mittleren Rollen beträgt und die mittlere Rolle im wesentlichen symmetrisch zu den beiden äußeren liegt. Günstig ist es dabei, wenn die äußeren Rollen der Rollenanordnung mit nach außen abnehmendem Durchmesser konisch sind und die mittlere Rolle im wesentlichen zylindrisch, vorzugsweise leicht bombiert ist, wobei die Anlagefläche der mittleren Rolle radial zumindest teilweise über die gedachte Verbindungsfläche zwischen den Anlageflächen der äußeren Rollen übersteht. Die mittlere Rolle übernimmt hier eine Führungsfunktion für das Schleifband, das immer die höchste (radial größte) Rollenstelle sucht.In tests, a roller arrangement with three rollers has proven itself, the width of the two outer rollers preferably being at least three times the width of the central rollers and the central roller being essentially symmetrical to the two outer rollers. It is advantageous if the outer rollers of the roller arrangement are conical with an outwardly decreasing diameter and the central roller is essentially cylindrical, preferably slightly cambered, the contact surface of the central roller radially at least partially over the imaginary connecting surface between the contact surfaces of the outer rollers survives. The middle role takes over a guiding function for the sanding belt, which is always looking for the highest (radially largest) role point.

Wenn sich benachbarte Rollen einer Rollenanordnung gemäß einer bevorzugten Ausführungsform der Erfindung stellenweise seitlich berühren, können die durch Schrägstellung der Drehachsen entstehenden Schlitze zwischen den Rollen auf eine minimale Breite beschränkt werden.If, in a preferred embodiment of the invention, adjacent rollers of a roller arrangement touch each other in places, the slots between the rollers resulting from inclined axes of rotation can be restricted to a minimum width.

Die Erfindung wird im folgenden durch ein Ausführungs­beispiel anhand der Zeichnungen näher erläutert. Es zeigen Fig. 1 eine stark schematisierte Draufsicht auf eine erfindungsgemäße Profilschleifmaschine und Fig. 2 eine Schnittansicht einer Rollenanordnung gemäß der Erfindung.The invention is explained in more detail below using an exemplary embodiment with reference to the drawings. 1 shows a highly schematic plan view of a profile grinding machine according to the invention and FIG. 2 shows a sectional view of a roller arrangement according to the invention.

Bei der in Fig. 1 gezeigten Profilschleifmaschine ist ein textiles Schleifband 10 über eine große zylindrische Antriebsscheibe 1, über fünf erfindungsgemäße Rollen­anordnungen 2,3,4,5 und 6, wie sie in Fig. 2 genauer dargestellt sind, und einen profilierten Schleifschuh 7 in einer im wesentlichen horizontalen Ebene geführt. Das zu schleifende Werkstück (nicht dargestellt) wird auf dem Schleiftisch 8 unter Anlage am profilierten Schleifschuh 7 vorbeigeführt. An den erfindungsgemäßen Rollenanordnungen 2 bis 6 erfährt das textile Schleif­band 10 eine maximale Umlenkung von ca. 70° pro Rollen­anordnung. Bei jedem Umlauf liegt das Schleifband 10 einmal eben (d.h. ohne Profilierung quer zur Bandlauf­richtung) an der zylindrischen Antriebsscheibe 1 an und etwa einen halben Umlauf später gemäß dem Profil des Schleifschuhs 7 an diesem an. Durch diese dauernden Profiländerungen wird die textile Unterlage des Schleifbandes 10 geschwächt. Die erfindungsgemäßen Rollenanordnung 2 bis 6, die im folgenden anhand der Fig. 2 näher beschrieben werden, ziehen das Schleif­band laufend quer zur Bandlaufrichtung auseinander und verhindern somit auch bei hohen Bandgeschwindig­keiten ein Überwerfen und Verwickeln des geschwächten textilen Schleifbandes 10 an. Außerdem tragen diese Rollenanordnungen 2 bis 6 dazu bei, das Schleifband zu schonen, indem die Profilierungsänderungen des Schleifbandes 10 an den Rollenanordnungen 2 bis 6 kontinuierlich und unter dauernder, satter Anlage über einen Großteil seiner Breite erfolgt, sodaß das Schleifband 10 schon von vornherein weniger geschwächt wird, als bei herkömmlichen Bandführungen.In the profile grinding machine shown in FIG. 1, a textile grinding belt 10 has a large cylindrical drive disc 1, five roller arrangements 2, 3, 4, 5 and 6 according to the invention, as are shown in more detail in FIG. 2, and a profiled grinding shoe 7 in a substantially horizontal plane. The workpiece to be ground (not shown) is guided past the profiled grinding shoe 7 on the grinding table 8. On the roller arrangements 2 to 6 according to the invention, the textile grinding belt 10 experiences a maximum deflection of approximately 70 ° per roller arrangement. With each revolution, the grinding belt 10 lies flat against the cylindrical drive pulley 1 (ie without profiling transversely to the belt running direction) and abuts against the grinding shoe 7 about half a revolution later according to the profile of the grinding shoe 7. These constant profile changes weaken the textile base of the grinding belt 10. The roller arrangement 2 to 6 according to the invention, which will be described in more detail below with reference to FIG. 2, continuously pull the sanding belt apart transversely to the belt running direction and thus prevent the weakened textile sanding belt 10 from being thrown over and tangled even at high belt speeds. In addition, these roller assemblies 2 to 6 help to protect the sanding belt by continuously changing the profiling of the sanding belt 10 on the roller assemblies 2 to 6 under continuous, full contact over a large part of its width, so that the sanding belt 10 is weakened less from the outset than with conventional tape guides.

In Fig. 2 ist eine erfindungsgemäße Rollenanordnung mit drei quer zur Laufrichtung des hier nicht dargestellten Schleifbandes nebeneinanderliegenden drehbaren Rollen 11, 12 und 13 aus Aluminium gezeigt, deren Drehachsen 11a,12a und 13a zueinander schräggestellt sind. Je nach Umfangs­lage erfährt ein an diesen Rollen 11,12 und 13 anliegendes Schleifband eine unterschiedliche Profilierung, wodurch sich seine Profilierung entlang der Anlagefläche in Bandlaufrichtung kontinuierlich ändert.2 shows a roller arrangement according to the invention with three rotatable rollers 11, 12 and 13 made of aluminum lying next to one another transversely to the running direction of the grinding belt (not shown here), the axes of rotation 11a, 12a and 13a of which are inclined to one another. Depending on the circumferential position, an abrasive belt resting on these rollers 11, 12 and 13 has a different profile, as a result of which its profile changes continuously along the contact surface in the direction of the belt run.

Bei der gezeigten Rollenanordnung sind die Drehachsen 11a und 12a der außenliegenden, konischen Rollen 11 und 12 über diese hinaus nach außen verlängert und jeweils gelenkig an einer im Betrieb maschinenfesten Halterung 14 gelagert. Die drei Rollen 11,12 und 13 sind als Ganzes, ohne Veränderung ihrer gegenseitigen Drehachsen­lage um eine die beiden Lagerstellen 15,16 verbindende gedachte Achse 17 verschwenkbar und damit ist die effektive, am Schleifband anliegende Profilierung einstellbar.In the roller arrangement shown, the axes of rotation 11a and 12a of the external, conical rollers 11 and 12 are extended outwards beyond them and are each articulated on a holder 14 which is fixed during operation. The three rollers 11, 12 and 13 can be pivoted as a whole without changing their mutual rotational axis position about an imaginary axis 17 connecting the two bearing points 15, 16, and thus the effective profiling resting on the grinding belt can be adjusted.

Zur genannten Einstellung ist die Drehachse 12a durch eine zylindrische Bohrung 18 der Halterung 14 geführt. Am Innenrand dieser Bohrung 18 liegt eine drehachsen­feste, kugelschichtförmige Fläche 19 an. Eine Mutter 20 kann von außen mit ihrer ebenfalls kugel­schichtförmigen Fläche 21 auf einem Gewinde der Dreh­achse 12a gegen den Außenrand der Bohrung 18 geschraubt und so die Lage der Rollenanordnung gegenüber der Halterung 14 eingestellt werden. Eine Anpassung an ver­schiedene Bandsorten und Profilierungen des auschwechsel­baren Schleifschuhs 7 ist damit leicht möglich.For the setting mentioned, the axis of rotation 12a is guided through a cylindrical bore 18 in the holder 14. At the inner edge of this bore 18 there is a surface 19 which is fixed in the form of a spherical axis and is fixed to the axis of rotation. A nut 20 can be screwed from the outside with its also spherical layer-shaped surface 21 on a thread of the axis of rotation 12a against the outer edge of the bore 18 and thus the position of the roller arrangement relative to the holder 14 can be adjusted. An adaptation to different types of bands and profiles of the exchangeable grinding shoe 7 is thus easily possible.

Die Rollen 11 und 12 sind leicht konisch und berühren stellenweise die kleinere,mittlere Rolle 13, welche als Führungsrolle dient. Diese kann wie im gezeigten Aus­führungsbeispiel zylindrisch sein. Es ist aber auch möglich, daß die mittlere Rolle 13 leicht bombiert ist und radial teilweise éber die gedachte Verbindungsfläche zwischen den Anlageflächen der äußeren Rollen 11,12 übersteht, womit eine bessere Bandführung erreichbar ist.The rollers 11 and 12 are slightly conical and touch the small, middle roller 13, which as Serves as a leading role. As in the exemplary embodiment shown, this can be cylindrical. However, it is also possible that the central roller 13 is slightly cambered and partially protrudes radially beyond the imaginary connecting surface between the contact surfaces of the outer rollers 11, 12, with the result that better tape guidance can be achieved.

Die Erfindung ist nicht auf das gezeigte Ausführungsbei­spiel beschränkt. Beispielsweise kann die Einstellung der Rollen einer Rollenanordnung auch dadurch erfolgen, daß der Winkel zwischen den einzelnen Drehachsen ver­stellbar ist. Die Rollen selbst können für sich profiliert oder zylindrisch sein und aus anderen Materialien als Aluminium, insbesondere aus Kunststoff bestehen. Auch ist es denkbar, die Rollen der erfindungsgemäßen Rollen­anordnung zumindest teilweise anzutreiben. Prinzipiell ist es weiters möglich, daß die Rollen in bestimmten Anwendungsfällen auf der Schleifseite des Schleifbandes anliegen. Auch kann die Zahl der Rollen pro Rollen­anordnung verschieden von drei sein.The invention is not restricted to the exemplary embodiment shown. For example, the rollers of a roller assembly can also be adjusted by adjusting the angle between the individual axes of rotation. The rollers themselves can be profiled or cylindrical and can be made of materials other than aluminum, in particular plastic. It is also conceivable to at least partially drive the rollers of the roller arrangement according to the invention. In principle, it is also possible for the rollers to rest on the grinding side of the grinding belt in certain applications. The number of rolls per roll arrangement can also be different from three.

Claims (7)

1. Schleifmaschine, insbesondere Profilschleifmaschine mit einem vorzugsweise endlos um Rollenanordnungen umlaufenden Schleifband, welches vorzugsweise mittels eines an der Schleifbandrückseite anliegenden, profilierten Schleifschuhs entsprechend der Form des zu schleifenden Werkstückes profiliert wird, wobei zumindest eine Rollenanordnung wenigstens zwei im wesentlichen quer zur Laufrich­tung des Schleifbandes nebeneinanderliegende, drehbare Rollen aufweist, an denen das Schleifband auf einem Großteil seiner Breite anliegt, dadurch gekennzeichnet, daß die Drehachsen (11a, 12a, 13a) der zu jeweils einer Rollenanordnung gehörigen, neben­einanderliegenden Rollen (11, 12, 13) zueinander schräggestellt sind.1. Grinding machine, in particular profile grinding machine with a preferably continuously rotating grinding belt, which is preferably profiled by means of a profiled grinding shoe lying on the back of the grinding belt in accordance with the shape of the workpiece to be ground, at least one roller arrangement of at least two juxtaposed essentially transverse to the running direction of the grinding belt , has rotatable rollers against which the grinding belt lies over a large part of its width, characterized in that the axes of rotation (11a, 12a, 13a) of the adjacent rollers (11, 12, 13) belonging to a respective roller arrangement are inclined to one another. 2. Schleifmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der Winkel, den die Drehachsen (11a, 12a, 13a) der Rollen (12, 13) der Rollenanordnung einschließen, verstellbar ist.2. Grinding machine according to claim 1, characterized in that the angle which the axes of rotation (11a, 12a, 13a) of the rollers (12, 13) of the roller assembly include, is adjustable. 3. Schleifmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Drehachsen (11a, 12a) der außen liegenden Rollen (11, 12) der Rollenanordnung (3, 4, 5, 6) über diese hinaus nach außen verlängert und jeweils gelenkig an einer im Betrieb maschinen­festen Halterung (14) gelagert sind, wobei die gesamte Rollen­anordnung um eine die beiden Lagerstellen (15, 16) der Drehachsen (11a, 12a) an der Halterung (12) verbindende, gedachte Achse (17) verschwenkbar ist.3. Grinding machine according to claim 1 or 2, characterized in that the axes of rotation (11a, 12a) of the external rollers (11, 12) of the roller assembly (3, 4, 5, 6) extends beyond this to the outside and each articulated to a mounting (14) which is fixed to the machine during operation, the entire roller arrangement being pivotable about an imaginary axis (17) connecting the two bearing points (15, 16) of the axes of rotation (11a, 12a) on the mounting (12). 4. Schleifmaschine nach Anspruch 3, dadurch gekennzeichnet, daß die Drehachse (12a) zumindest einer Rolle (12) der Rollenanordnung (3, 4, 5, 6) durch eine rotationssymmetrische Bohrung (18) der Halterung (14) geführt ist, wobei an dem den Rollen (11, 12, 13) zugewandten Innenrand der Bohrung (18) eine drehachsenfeste, kugelschichtförmige Fläche (19) anliegt und eine Mutter (20) mit einer zur Bohrung (18) weisenden kugelschichtförmigen Fläche (21) vorgesehen ist, die auf einem Gewinde der Drehachse (12a) gegen den Außerand der Bohrung (18) schraubbar ist.4. Grinding machine according to claim 3, characterized in that the axis of rotation (12a) of at least one roller (12) of the roller arrangement (3, 4, 5, 6) is guided through a rotationally symmetrical bore (18) of the holder (14), wherein the inner edge of the bore (18) facing the rollers (11, 12, 13) bears a surface (19) which is fixed in the form of a spherical layer and a nut (20) a spherical layer surface (21) facing the bore (18) is provided, which can be screwed onto a thread of the axis of rotation (12a) against the outside of the bore (18). 5. Schleifmaschine nach einem der Ansprüche 1 bis 4, dadurch gekenn­zeichnet, daß sich benachbarte Rollen (11, 12, 13) einer Rollen­anordnung stellenweise seitlich berühren.5. Grinding machine according to one of claims 1 to 4, characterized in that adjacent rollers (11, 12, 13) of a roller arrangement touch in places laterally. 6. Schleifmaschine nach einem der Ansprüche 1 bis 5, dadurch gekenn­zeichnet, daß wenigstens eine Rollenanordnung (3, 4) drei Rollen aufweist, wobei die Breite der beiden äußeren Rollen vorzugsweise jeweils mindestens das Dreifache der Breite der mittleren Rollen (13) beträgt und die mittlere Rolle (13) im wesentlichen symmetrisch zu den beiden äußeren (11, 12) liegt.6. Grinding machine according to one of claims 1 to 5, characterized in that at least one roller arrangement (3, 4) has three rollers, the width of the two outer rollers preferably being at least three times the width of the central rollers (13) and the middle roller (13) is substantially symmetrical to the two outer (11, 12). 7. Schleifmaschine nach Anspruch 6, dadurch gekennzeichnet, daß die äußeren Rollen (11, 12) der Rollenanordnung (3, 4, 5, 6) mit nach außen abnehmendem Durchmesser konisch sind und die mittlere Rolle (13) im wesentlichen zylindrisch, vorzugsweise leicht bombiert ist, wobei Anlagefläche der mittleren Rolle (13) radial zumindest teilweise über die gedachte Verbindungsfläche zwischen den Anlageflächen der äußeren Rollen (11, 12) übersteht.7. Grinding machine according to claim 6, characterized in that the outer rollers (11, 12) of the roller arrangement (3, 4, 5, 6) are conical with an outwardly decreasing diameter and the central roller (13) is substantially cylindrical, preferably light is cambered, the contact surface of the central roller (13) projecting radially at least partially beyond the imaginary connecting surface between the contact surfaces of the outer rollers (11, 12).
EP87108438A 1986-06-16 1987-06-11 Sanding machine, in particular profile sanding machine Withdrawn EP0249890A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT162086A AT386372B (en) 1986-06-16 1986-06-16 GRINDING MACHINE, ESPECIALLY PROFILE GRINDING MACHINE
AT1620/86 1986-06-16

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EP0249890A1 true EP0249890A1 (en) 1987-12-23

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EP (1) EP0249890A1 (en)
AT (1) AT386372B (en)

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CN114871912A (en) * 2022-03-31 2022-08-09 重庆山朕科技发展有限公司 Grinding method of abrasive belt type projection welding electrode grinding device

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CN110977721A (en) * 2019-12-31 2020-04-10 奥美森智能装备股份有限公司 Full-automatic grinding mechanism
CN114871912A (en) * 2022-03-31 2022-08-09 重庆山朕科技发展有限公司 Grinding method of abrasive belt type projection welding electrode grinding device

Also Published As

Publication number Publication date
AT386372B (en) 1988-08-10
ATA162086A (en) 1988-01-15

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