EP2991804B1 - Rotary grinding tool - Google Patents

Rotary grinding tool Download PDF

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Publication number
EP2991804B1
EP2991804B1 EP14716859.5A EP14716859A EP2991804B1 EP 2991804 B1 EP2991804 B1 EP 2991804B1 EP 14716859 A EP14716859 A EP 14716859A EP 2991804 B1 EP2991804 B1 EP 2991804B1
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EP
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Prior art keywords
sanding
grinding
tool
openings
sanding body
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EP14716859.5A
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German (de)
French (fr)
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EP2991804A1 (en
Inventor
Nathanael Sutter
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/02—Wheels in one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with cooling provisions, e.g. with radial slots

Definitions

  • the invention relates to a grinding tool with a grinding body that can be rotated about an axis of rotation and in which openings are arranged in such a way that a user or a grinder can look through the rotating grinding body during the grinding work.
  • the invention relates to a cylindrical grinding wheel in which the grinder can see through the rotating cylindrical grinding wheel when grinding.
  • Grinding or polishing bodies are known in the prior art for different applications.
  • grinding and polishing bodies for cylindrical grinding machines are known, in which more or less rigid disks or cylinders are known, which are subjected to abrasive grain on their grinding surface.
  • grinding or polishing bodies for example also used together with an abrasive or polishing compound.
  • different designs of grinding bodies are known for various grinding purposes.
  • flexible grinding bodies such as discs, strips, belts or lamellae are used, which carry abrasive grains on a paper, fabric, fiber or fleece backing. From the DE 27 43 585 For example, an abrasive article for cylindrical grinding machines is disclosed which is dedicated to improving the life of flexible abrasive sheets and the uniformity of grinding performance.
  • the grinding result when grinding does not only depend on the grinding equipment.
  • the abrasive grain and the grinding machines there is a need to regularly monitor the grinding work.
  • the grinder has to interrupt his work regularly, but cannot determine with certainty from the shading whether he has already removed one or more additional bond planes. For example, if the relative orientation of the shading changes from level to level, from a longitudinal shading to a transverse shading, it may be that two or more additional levels have already been removed during the grinding. Based on the orientation of the shading, the grinder can only see that he has removed at least one compound level. However, the abrasion during grinding cannot be reliably observed from bond level to bond level.
  • the object of the present invention is to provide a grinding tool that overcomes the aforementioned disadvantages and enables the grinder to monitor the grinding result during the grinding process and thereby control the machining depth.
  • the object is achieved with the features according to claim 1.
  • the basic idea of the present invention is therefore a grinding tool with a grinding wheel that can be rotated about an axis of rotation, in which the number and position of suitable openings or openings or recesses are provided, which are arranged on diametrically opposite sides of the lateral surface of the grinding wheel with respect to the axis of rotation in such a way that the grinder when grinding through the can see through the rotating grinding wheel.
  • the invention which relates to a grinding wheel with openings provided in the grinding surface, eliminates the aforementioned disadvantages in that the size, position and relative location of the openings in the form of slots, slots, recesses or the like can be selected in that the The workpiece covered by the grinding device can be observed by the grinder through the grinding tool.
  • radial slots or elongated holes can be provided as openings, which preferably have the same or different lengths in order to obtain a view of the grinding surface that is as constant as possible.
  • a grinding tool is therefore provided with a grinding body that can be rotated about an axis of rotation, wherein the lateral surface of the grinding body is designed as a grinding surface and wherein the grinding body has at least two openings passing through the grinding body on diametrically opposite sides of the lateral surface with respect to the axis of rotation, which are arranged in such a way that the processor can see through the rotating grinding wheel while grinding.
  • the suitable, in particular diametrically opposite, arrangement of openings in the grinding wheel ensures that the diametrically opposite openings in each case release the view (optical path) of the surface to be ground or processed and the viewer due to sufficiently fast rotation, i.e. depending on the rotational speed the laziness of the eye obtains an "apparently continuous image" of the grinding surface. Consequently, the viewer sees a chronological sequence of Images of the grinding surface, which enable him to constantly monitor and observe the grinding result without stopping the grinding tool or lifting it off the surface to be processed.
  • the grinding body is designed as a cylindrical grinding body that can be rotated about the cylinder axis.
  • the grinding body can also be designed as a conical grinding body that can be rotated about the longitudinal axis of the cone.
  • the grinding body can be designed as a hollow-cylindrical grinding body, so that a recess is formed in the interior of the grinding body.
  • a grinding tool is provided which has good air-cooling properties and in which, as a result of air turbulence, the abraded material can be easily sucked off, which is not the case with a grinding wheel, for example, where the abraded material is between the grinding surface and the area to be processed .
  • a recess is arranged in the grinding wheel between pairs of diametrically opposite openings in such a way that a view through the grinding wheel (optical path) is created between the opposite openings.
  • the grinding tool is designed as a hollow-cylindrical grinding body, the interior of the grinding body already forms the aforementioned recess.
  • the grinding tool can also be designed as a solid cylinder, so that pairs of opposite openings must be arranged by means of a recess connecting the openings, so that the possibility of looking through the grinding body is achieved.
  • grinding bodies that are not designed as hollow bodies can also be provided with the openings according to the invention, so that the grinder can pass through the rotating grinding body, i.e.
  • the openings in the form of elongated holes. It is particularly preferred to orient the elongated holes transversely to the axis of rotation. In a particularly preferred embodiment, the elongated holes extend in the transverse direction to the axis of rotation over an arc of approximately 50° to approximately 100°, particularly preferably between 80° and 90°. This ensures that over a relatively long turning path, namely when turning by the corresponding radian measure between 50° and 100°, there is a possibility of looking through even at slow turning speeds. If the number and arrangement of the openings relative to one another is suitably selected, such an embodiment equally provides a maximum effective grinding surface with good visibility at the same time.
  • a preferred embodiment is seen in the fact that two diametrically opposite oblong holes are arranged parallel to one another (in the axial height direction) in the abrasive body, with a grinding surface being arranged on the lateral surface above and below the oblong holes.
  • the grinding body also has a grinding surface between the elongated holes. Since there is also a grinding surface next to the elongated holes in the direction of rotation, it is ensured that a section with a grinding surface is distributed over the entire height of the lateral surface of the grinding element.
  • a grinding tool is provided that forms a plurality of hole pairs of diametrically opposite openings 4a, 4b in the height direction H and in the circumferential direction offset to one another in the grinding body 2.
  • two diametrically opposite openings in the abrasive body can be offset in the radial direction by 90° and in the height direction H compared to the oblong holes described above, which are arranged parallel to one another.
  • the elongated holes are arranged approximately by a radian of 90° along the outer circumference of the lateral surface of the abrasive body, this ensures that there is a sufficiently good view of the to be machined essentially for the entire turning process, even at low turning speeds surface is given, so that the grinder can see the grinding point and, for example, the change in the shading in the glass fiber reinforced plastic with increasing removal during the entire grinding process.
  • the further object is to improve the tool to the effect that there is a good possibility of looking through the tool under different lighting conditions.
  • a shiny metallic tool surface reflects incident light more than, for example, a matt composite material to be processed, the scattered light intensity due to the reflection is greater than the intensity of the light that is reflected back from the material surface through the openings into the eye of the observer.
  • the grinding tool is therefore made from a metallic material with a surface having a high degree of light absorption LA W in the wavelength range of visible light, in particular in the wavelength range ⁇ between 380-780 nm.
  • This ensures that the degree of light reflection LR W and thus the reflection of scattered light from the tool surface is low. Consequently, the quotient of the degree of light reflection LR M of the material surface to be processed to the degree of light reflection LR w of the tool surface increases as the degree of light absorption LA w increases and is therefore better for the processor, since that depends on the surface to be processed reflected light has a relatively higher intensity compared to a highly reflective tool surface.
  • the abrasive body has a surface that is designed with a high degree of light absorption above 80% in the wavelength range ⁇ between 380-780 nm, so that the surface appears dark to black and reflects only little scattered light.
  • the abrasive body has a black surface which is formed with a high degree of light absorption of almost 100% in the wavelength range ⁇ between 380-780 nm. It is advantageous here to provide the abrasive body with a black surface coating, preferably a matt black surface coating, such as a black lacquer.
  • the surface coating is a heat-resistant coating that thermally withstands the temperatures to be expected during the grinding process.
  • the surface of the grinding wheel can be coated with a heat-resistant matt black paint.
  • a grinding tool 1 with a grinding body 2 rotatable about an axis of rotation 3 is shown.
  • the axis of rotation 3 runs through the central cylinder axis of the grinding body 2.
  • the grinding body 2 is connected to a shaft 10 which can be coupled to a drive, such as a rotary drive, in order to set the grinding tool 1 in rotary motion.
  • the grinding wheel 2 is designed as a hollow-cylindrical grinding wheel.
  • the cylindrical grinding body 2 has a casing 7 with a lateral surface 6.
  • the lateral surface 6 forms the grinding surface of the grinding body 2 and extends in the vertical direction H, which is oriented parallel to the axis of rotation 3 of the grinding tool 1.
  • Diametrically opposite openings 4a, 4b, specifically elongated holes, are arranged in the grinding body 2 with respect to the axis of rotation 3.
  • the elongated holes 4a, 4b extend with their longitudinal extent transversely to the axis of rotation or transversely to the height direction H in the circumferential direction. It can also be seen that two elongated holes 4a are arranged parallel to one another and have a length corresponding to radians of 70°-80° in the jacket 7 and represent window-like openings in the jacket 7 . This allows the grinder during grinding through the openings in the lateral surface 6 and in the jacket 7 of the grinding body 2 through two pairs of opposing Openings 4a, 4b look through.
  • two further diametrically opposite openings 4a, 4b are offset by approximately 90° in the circumferential direction to the openings 4a, 4b described above.
  • the length of the elongated holes 4a, 4b is in accordance with the embodiment shown here 1 roughly identical. However, slots of different lengths can also be arranged in the casing 7 of the grinding body 2 .
  • the cylindrical grinding body 2 could also be designed as a solid cylinder.
  • the respectively opposite openings 4a, 4b would have to be connected to one another by means of a cutout connecting the openings through the cylindrical abrasive body in such a way that a view-through possibility is provided.
  • the recess 5 can be used as an alternative to the 1 shown cylindrical shape can also be designed differently, provided it is ensured that two diametrically opposite openings 4a, 4b are connected to each other so that a view through the abrasive body 2 is obtained.
  • FIG 2 shows an alternative exemplary embodiment of a grinding tool 1 according to the invention with a hollow-cylindrical grinding body 2 and openings 4a, 4b arranged therein and running parallel to the vertical direction H, with two diametrically opposite openings 4a, 4b being arranged in such a way that the possibility of looking through the grinding body 2 is obtained .
  • the surface of the grinding wheel is in the versions of the 1 and 2 preferably matt black and heat resistant coated.
  • FIG 3 a further exemplary embodiment of a grinding tool 1 according to the invention with a hollow-cylindrical grinding body 2 is shown.
  • the Grinding body 2 is designed to run particularly smoothly and has a particularly good view-through option due to the effectively large openings 4a, 4b.
  • the openings are formed in a triangular shape with rounded corners 9 .
  • the openings 4a, 4b are shaped in such a way that the webs 8 of the grinding wheel 2 arranged between them run diagonally (with respect to the axis of rotation 3).
  • the openings 4a, 4b are formed with rounded corners 9.
  • the shape and in particular the diagonal arrangement of the webs 8 has the effect that, unlike webs 8 oriented parallel to the axis of rotation 3, the effective engagement of a diagonal web 8 with the surface to be machined during the rotation does not take place simultaneously over the entire web section, but instead gradually along the web 8 begins. This improves the smooth running of the grinding tool 1.
  • the grinding tool 1 is designed with a conical grinding body 2 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Description

Die Erfindung betrifft ein Schleifwerkzeug mit einem, um eine Drehachse drehbaren Schleifkörper, in dem Öffnungen derart angeordnet sind, dass ein Benutzer bzw. ein Schleifer bei den Schleifarbeiten durch den drehenden Schleifkörper hindurchschauen kann. Die Erfindung betrifft insbesondere einen zylinderförmigen Schleifkörper, bei dem der Schleifer beim Schleifen durch den drehenden zylinderförmigen Schleifkörper hindurchschauen kann.The invention relates to a grinding tool with a grinding body that can be rotated about an axis of rotation and in which openings are arranged in such a way that a user or a grinder can look through the rotating grinding body during the grinding work. In particular, the invention relates to a cylindrical grinding wheel in which the grinder can see through the rotating cylindrical grinding wheel when grinding.

Schleif- oder Polierkörper sind für unterschiedliche Anwendungsfälle im Stand der Technik bekannt. So sind beispielsweise Schleif- und Polierkörper für Rundschleifmaschinen bekannt, bei der mehr oder weniger starre Scheiben oder Zylinder, welche an ihrer Schleiffläche mit einem Schleifkorn beaufschlagt sind, bekannt sind. Ferner werden Schleif- oder Polierkörper beispielsweise auch zusammen mit einem Schleif- oder Poliermittel verwendet. Im Stand der Technik sind für diverse Schleifzwecke unterschiedliche Ausführungen von Schleifkörper bekannt. So verwendet man beispielsweise flexible Schleifkörper wie Scheiben, Streifen, Bänder oder Lamellen, die auf einem Träger aus Papier, Gewebe, Fiber oder Vlies Schleifkörner tragen. Aus der DE 27 43 585 ist beispielsweise ein Schleifkörper für Rundschleifmaschinen offenbart, der sich der Aufgabe widmet, die Standzeiten von flexiblen Schleifblättern und die Gleichmäßigkeit der Schleifleistung zu verbessern.Grinding or polishing bodies are known in the prior art for different applications. For example, grinding and polishing bodies for cylindrical grinding machines are known, in which more or less rigid disks or cylinders are known, which are subjected to abrasive grain on their grinding surface. Furthermore, grinding or polishing bodies, for example also used together with an abrasive or polishing compound. In the prior art, different designs of grinding bodies are known for various grinding purposes. For example, flexible grinding bodies such as discs, strips, belts or lamellae are used, which carry abrasive grains on a paper, fabric, fiber or fleece backing. From the DE 27 43 585 For example, an abrasive article for cylindrical grinding machines is disclosed which is dedicated to improving the life of flexible abrasive sheets and the uniformity of grinding performance.

Ferner ist aus der DE 570 805 ein Schleifkopf bekannt, zum Schleifen ebener Flächen. Diese Druckschrift widmet sich dem Arbeiten beim Schleifen ebener Flächen mittels Schleifscheiben, die mit der ebenen Stirnfläche arbeiten und die insbesondere gegenüber der antreibenden Welle abgefedert sind, um dadurch eine allseitige Beweglichkeit, insbesondere mittels eines Kugelgelenkes, zu erzielen. Auf diese Weise kann das Schleifergebnis verbessert werden.Furthermore, from the DE 570 805 a grinding head is known for grinding flat surfaces. This publication is dedicated to working when grinding flat surfaces using grinding wheels that work with the flat end face and are cushioned in particular with respect to the driving shaft in order to achieve mobility in all directions, in particular by means of a ball joint. In this way, the grinding result can be improved.

Die US 3 841 034 A offenbart einen Schleifkopf gemäß dem Oberbegriff von Anspruch 1.the U.S. 3,841,034 A discloses a sanding head according to the preamble of claim 1.

Allerdings hängt das Schleifergebnis beim Schleifen nicht ausschließlich vom Schleif-Equipment ab. Neben den Einflüssen der Ausbildung des Schleifkörpers, des Schleifkorns und der Schleifmaschinen besteht ein Bedürfnis darin, die Schleifarbeit regelmäßig zu überwachen.However, the grinding result when grinding does not only depend on the grinding equipment. In addition to the influences of the design of the abrasive body, the abrasive grain and the grinding machines, there is a need to regularly monitor the grinding work.

Bei den bisher bekannten Schleifkörpern ist es nicht möglich, die Schlifffläche während der Schleifarbeit, das heißt während des Schleifvorgangs, zu beobachten und damit das Schleifergebnis zu überwachen. Es ist daher immer wieder erforderlich, den Schleifvorgang zu unterbrechen. Nach jedem Abheben des Schleifwerkzeugs von der zu bearbeitenden Fläche, zum Beispiel zur Kontrolle der Abtragtiefe, entstehen beim Aufsetzen des Schleifwerkzeuges neue Anschliffflächen und in deren Folgen entstehen ungenaue und unbefriedigende Schleifergebnisse. Darüber hinaus ergeben sich bei der Bearbeitung von Verbundwerkstoffen, speziell von glasfaserverstärkten Kunststoffen, beim Schleifen weitere Probleme, die es zu berücksichtigen gibt. So ist es beispielsweise notwendig eine Staubabsaugung vorzusehen, um den Schleifabtrag kontinuierlich abzuführen. Darüber hinaus verlangt der spezielle Aufbau von Verbundwerkstoffen, wie z.B. von glasfaserverstärkten Kunststoffen, dass die Abtragtiefe, das heißt die Bearbeitungstiefe beim Wegschleifen, während des Schleifvorgangs erkannt und sicher bestimmt werden muss. Durch die unterschiedlichen Schattierungen bzw. die Arten der Schattierungen je nach Bearbeitungstiefe, kann der Schleifer erkennen, wie hoch der Abtrag durch das Schleifen fortgeschritten ist.With the previously known grinding bodies, it is not possible to observe the ground surface during the grinding work, ie during the grinding process, and thus to monitor the grinding result. It is therefore always necessary to interrupt the grinding process. Each time the grinding tool is lifted from the surface to be machined, for example to check the removal depth, new grinding surfaces are created when the grinding tool is put down, which results in imprecise and unsatisfactory grinding results. In addition, when grinding composite materials, especially glass fiber reinforced plastics, there are other problems that need to be taken into account. For example, it is necessary to provide dust extraction to continuously remove the abrasive material to dissipate In addition, the special structure of composite materials, such as glass fiber reinforced plastics, requires that the removal depth, i.e. the processing depth when grinding away, must be recognized and reliably determined during the grinding process. Due to the different shades or the types of shades depending on the processing depth, the grinder can see how much the removal has progressed through the grinding.

Bei den im Stand der Technik bekannten, herkömmlichen Schleifkörpern besteht allerdings der Nachteil darin, dass der Schleifer dazu seine Arbeit regelmäßig unterbrechen muss, aber anhand der Schattierung nicht sicher feststellen kann, ob er bereits eine oder mehrere zusätzliche Verbundebenen abgetragen hat. Wechseln zum Beispiel die Schattierungen in ihrer relativen Orientierung von Ebene zu Ebene von einer Längsschattierung zu einer Querschattierung, so kann es sein, dass beim Schleifen bereits zwei oder mehrere zusätzliche Ebenen abgeschliffen wurden. Der Schleifer kann anhand der Orientierung der Schattierung nur erkennen, dass er mindestens eine Verbundebene abgetragen hat. Die Abtragung beim Schleifen kann aber von Verbundebene zu Verbundebene nicht zuverlässig beobachtet werden.However, with the conventional grinding bodies known in the prior art, there is the disadvantage that the grinder has to interrupt his work regularly, but cannot determine with certainty from the shading whether he has already removed one or more additional bond planes. For example, if the relative orientation of the shading changes from level to level, from a longitudinal shading to a transverse shading, it may be that two or more additional levels have already been removed during the grinding. Based on the orientation of the shading, the grinder can only see that he has removed at least one compound level. However, the abrasion during grinding cannot be reliably observed from bond level to bond level.

Insbesondere bei Reparatur- und Instandsetzungsarbeiten von Verbundwerkstoffen, im Speziellen von glasfaserverstärkten Kunststoffen, ist es neben der Überwachung der exakten Bearbeitungstiefe während des Schleifvorgangs ferner von besonderer Wichtigkeit, auch geeignete Staubabsaugungsmöglichkeiten bereitzustellen.In addition to monitoring the exact machining depth during the grinding process, it is also of particular importance to provide suitable dust extraction options, especially when repairing and maintaining composite materials, especially glass fiber reinforced plastics.

Vor diesem Hintergrund ist es Aufgabe der vorliegenden Erfindung, ein Schleifwerkzeug bereitzustellen, welches vorgenannte Nachteile überwindet und es dem Schleifer während des Schleifvorgangs ermöglicht, das Schleifergebnis zu überwachen und dabei die Bearbeitungstiefe zu kontrollieren.Against this background, the object of the present invention is to provide a grinding tool that overcomes the aforementioned disadvantages and enables the grinder to monitor the grinding result during the grinding process and thereby control the machining depth.

Die Aufgabe wird gelöst mit den Merkmalen gemäß dem Patentanspruch 1. Grundgedanke der vorliegenden Erfindung ist es daher, ein Schleifwerkzeug mit einem, um eine Drehachse drehbaren Schleifkörper bereitzustellen, bei dem in der Anzahl und der Lage geeignete Öffnungen bzw. Durchbrüche oder Ausnehmungen vorgesehen werden, die bezüglich der Drehachse an diametral gegenüberliegenden Seiten der Mantelfläche des Schleifkörpers so angeordnet sind, dass der Schleifer beim Schleifen durch den drehenden Schleifkörper hindurchschauen kann.The object is achieved with the features according to claim 1. The basic idea of the present invention is therefore a grinding tool with a grinding wheel that can be rotated about an axis of rotation, in which the number and position of suitable openings or openings or recesses are provided, which are arranged on diametrically opposite sides of the lateral surface of the grinding wheel with respect to the axis of rotation in such a way that the grinder when grinding through the can see through the rotating grinding wheel.

Die Erfindung, die sich auf einen Schleifkörper mit in der Schleiffläche vorgesehenen Öffnungen bezieht, beseitigt die zuvor genannten Nachteile dadurch, dass die Größe, Position und relative Lage der Öffnungen in Form von Schlitzen, Langlöchern, Ausnehmungen oder dergleichen gewählt werden kann dadurch, dass das vom Schleifgerät verdeckte Werkstück vom Schleifer durch das Schleifwerkzeug hindurch beobachtet werden kann. Als Öffnungen können z.B. radiale Schlitze oder Langlöcher vorgesehen werden, die vorzugsweise gleiche oder unterschiedliche Längen aufweisen, um eine möglichst konstante Sicht auf die Schleiffläche zu erhalten.The invention, which relates to a grinding wheel with openings provided in the grinding surface, eliminates the aforementioned disadvantages in that the size, position and relative location of the openings in the form of slots, slots, recesses or the like can be selected in that the The workpiece covered by the grinding device can be observed by the grinder through the grinding tool. For example, radial slots or elongated holes can be provided as openings, which preferably have the same or different lengths in order to obtain a view of the grinding surface that is as constant as possible.

Erfindungsgemäß wird daher ein Schleifwerkzeug mit einem um eine Drehachse drehbaren Schleifkörper bereitgestellt, wobei die Mantelfläche des Schleifkörpers als Schleiffläche ausgebildet ist und wobei der Schleifkörper mindestens zwei durch den Schleifkörper hindurchgehende Öffnungen an bezüglich der Drehachse diametral gegenüberliegenden Seiten der Mantelfläche aufweist, die derart angeordnet sind, dass der Bearbeiter beim Schleifen durch den drehenden Schleifkörper hindurchschauen kann.According to the invention, a grinding tool is therefore provided with a grinding body that can be rotated about an axis of rotation, wherein the lateral surface of the grinding body is designed as a grinding surface and wherein the grinding body has at least two openings passing through the grinding body on diametrically opposite sides of the lateral surface with respect to the axis of rotation, which are arranged in such a way that the processor can see through the rotating grinding wheel while grinding.

Durch die geeignete, insbesondere diametral gegenüberliegende Anordnung von Öffnungen im Schleifkörper wird gewährleistet, dass die jeweils diametral gegenüberliegenden Öffnungen bei ausreichend schneller Drehung d.h. abhängig von der Drehgeschwindigkeit die Sicht (optischer Pfad) auf die zu schleifende bzw. zu bearbeitende Oberfläche freigeben und der Betrachter aufgrund der Trägheit des Auges ein "scheinbar kontinuierliches Bild" von der Schleifoberfläche erhält. Folglich sieht der Betrachter eine zeitliche Aneinanderreihung von Bildern der Schleifoberfläche, die ihm eine permanente Überwachung und Beobachtung des Schleifergebnisses ermöglichen, ohne das Schleifwerkzeug anzuhalten oder von der zu bearbeitenden Fläche abzuheben.The suitable, in particular diametrically opposite, arrangement of openings in the grinding wheel ensures that the diametrically opposite openings in each case release the view (optical path) of the surface to be ground or processed and the viewer due to sufficiently fast rotation, i.e. depending on the rotational speed the laziness of the eye obtains an "apparently continuous image" of the grinding surface. Consequently, the viewer sees a chronological sequence of Images of the grinding surface, which enable him to constantly monitor and observe the grinding result without stopping the grinding tool or lifting it off the surface to be processed.

In einer bevorzugten Ausführungsform ist der Schleifkörper als ein um die Zylinderachse drehbarer, zylinderförmiger Schleifkörper ausgebildet.In a preferred embodiment, the grinding body is designed as a cylindrical grinding body that can be rotated about the cylinder axis.

In einer alternativen Ausführungsform kann der Schleifkörper allerdings auch als kegelförmiger Schleifkörper ausgebildet sein, der sich um die Kegellängsachse drehen lässt.In an alternative embodiment, however, the grinding body can also be designed as a conical grinding body that can be rotated about the longitudinal axis of the cone.

In einer besonders bevorzugten Ausführungsform kann der Schleifkörper als hohlzylinderförmiger Schleifkörper ausgebildet sein, so dass in dem Innenraum des Schleifkörpers eine Aussparung ausgebildet ist. Auf diese Weise wird ein Schleifwerkzeug bereitgestellt, das über gute Luftkühleigenschaften verfügt und bei dem infolge von Luftverwirbelungen der Schleifabtrag gut abgesaugt werden kann, was beispielsweise bei einer Schleifscheibe, bei der sich der Schleifabtrag zwischen der Schleiffläche und der zu bearbeitenden Stelle befindet, nicht gegeben ist.In a particularly preferred embodiment, the grinding body can be designed as a hollow-cylindrical grinding body, so that a recess is formed in the interior of the grinding body. In this way, a grinding tool is provided which has good air-cooling properties and in which, as a result of air turbulence, the abraded material can be easily sucked off, which is not the case with a grinding wheel, for example, where the abraded material is between the grinding surface and the area to be processed .

In einer besonders vorteilhaften Ausführungsform der Erfindung ist zwischen jeweils paarweise diametral gegenüberliegenden Öffnungen eine Aussparung im Schleifkörper so angeordnet, dass zwischen den gegenüberliegenden Öffnungen eine Durchsichtmöglichkeit (optischer Pfad) durch den Schleifkörper geschaffen wird. Sofern das Schleifwerkzeug als hohlzylinderförmiger Schleifkörper ausgebildet ist, bildet der Innenraum des Schleifkörpers bereits die zuvor genannte Aussparung. Allerdings kann das Schleifwerkzeug auch als Vollzylinder ausgebildet sein, so dass jeweils paarweise gegenüberliegende Öffnungen mittels einer die Öffnungen verbindenden Aussparung angeordnet sein müssen, so dass eine Durchsichtmöglichkeit durch den Schleifkörper erzielt wird. Auf diese Weise können auch nicht als Hohlkörper ausgebildete Schleifkörper mit den erfindungsgemäßen Öffnungen versehen werden, so dass der Schleifer beim Schleifen durch den drehenden Schleifkörper, sprich durch die Öffnungen und Aussparungen, hindurchschauen kann. Bevorzugt ist es, die Öffnungen in der Form von Langlöchern auszubilden. Wobei es besonders bevorzugt ist, die Langlöcher quer zur Drehachse zu orientieren. In einer besonders bevorzugten Ausführungsform erstrecken sich die Langlöcher in Querrichtung zur Drehachse über ein Bogenmaß von etwa 50° bis etwa 100°, besonders bevorzugt zwischen 80° und 90°. Hierdurch wird gewährleistet, dass über einen relativ langen Drehweg, nämlich beim Drehen um das entsprechende Bogenmaß zwischen 50° und 100° eine Durchsichtsmöglichkeit auch bei langsamen Drehgeschwindigkeiten gegeben ist. Sofern die Anzahl und Anordnung der Öffnungen relativ zueinander geeignet gewählt wird, stellt eine solche Ausführung gleichermaßen eine maximal wirksame Schleiffläche bei gleichzeitig guter Durchsicht bereit. Eine bevorzugte Ausführungsform wird darin gesehen, dass je zwei diametral gegenüberliegende Langlöcher zueinander (in axialer Höhenrichtung) parallel orientiert im Schleifkörper angeordnet sind, wobei oberhalb und unterhalb der Langlöcher eine Schleiffläche an der Mantelfläche angeordnet ist. Zwischen den Langlöchern weist der Schleifkörper ebenfalls eine Schleiffläche auf. Da sich neben den Langlöchern in Drehrichtung ebenfalls eine Schleiffläche befindet, wird sichergestellt, dass verteilt über die gesamte Höhe der Mantelfläche des Schleifkörpers jeweils ein Abschnitt mit einer Schleiffläche ausgebildet ist.In a particularly advantageous embodiment of the invention, a recess is arranged in the grinding wheel between pairs of diametrically opposite openings in such a way that a view through the grinding wheel (optical path) is created between the opposite openings. If the grinding tool is designed as a hollow-cylindrical grinding body, the interior of the grinding body already forms the aforementioned recess. However, the grinding tool can also be designed as a solid cylinder, so that pairs of opposite openings must be arranged by means of a recess connecting the openings, so that the possibility of looking through the grinding body is achieved. In this way, grinding bodies that are not designed as hollow bodies can also be provided with the openings according to the invention, so that the grinder can pass through the rotating grinding body, i.e. through the openings, during grinding and recesses, can see through. It is preferred to form the openings in the form of elongated holes. It is particularly preferred to orient the elongated holes transversely to the axis of rotation. In a particularly preferred embodiment, the elongated holes extend in the transverse direction to the axis of rotation over an arc of approximately 50° to approximately 100°, particularly preferably between 80° and 90°. This ensures that over a relatively long turning path, namely when turning by the corresponding radian measure between 50° and 100°, there is a possibility of looking through even at slow turning speeds. If the number and arrangement of the openings relative to one another is suitably selected, such an embodiment equally provides a maximum effective grinding surface with good visibility at the same time. A preferred embodiment is seen in the fact that two diametrically opposite oblong holes are arranged parallel to one another (in the axial height direction) in the abrasive body, with a grinding surface being arranged on the lateral surface above and below the oblong holes. The grinding body also has a grinding surface between the elongated holes. Since there is also a grinding surface next to the elongated holes in the direction of rotation, it is ensured that a section with a grinding surface is distributed over the entire height of the lateral surface of the grinding element.

Erfindungsgemäß wird eine Schleifwerkzeug bereitgestellt, dass mehrere Lochpaarungen diametral gegenüberliegender Öffnungen 4a, 4b in Höhenrichtung H und in Umfangsrichtung zueinander versetzt im Schleifkörper 2 ausbildet. In einer besonders bevorzugten Ausführungsform können z.B. zwei diametral gegenüberliegende Öffnungen im Schleifkörper in Radialrichtung um 90° und in Höhenrichtung H gegenüber den zuvor beschriebenen parallel zueinander angeordneten Langlöcher versetzt angeordnet sein. Sofern die Langlöcher in etwa um ein Bogenmaß von 90° entlang dem Außenumfang der Mantelfläche des Schleifkörpers angeordnet sind, wird hierdurch gewährleistet, dass im Wesentlichen für den gesamten Drehvorgang auch bei geringen Drehgeschwindigkeiten jeweils eine ausreichend gute Durchsichtmöglichkeit auf die zu bearbeitenden Oberfläche gegeben ist, so dass der Schleifer während des gesamten Schleifvorgangs die Schleifstelle und z.B. die Veränderung der Schattierungen im glasfaserverstärkten Kunststoff mit zunehmendem Abtrag erkennen kann.According to the invention, a grinding tool is provided that forms a plurality of hole pairs of diametrically opposite openings 4a, 4b in the height direction H and in the circumferential direction offset to one another in the grinding body 2. In a particularly preferred embodiment, for example, two diametrically opposite openings in the abrasive body can be offset in the radial direction by 90° and in the height direction H compared to the oblong holes described above, which are arranged parallel to one another. If the elongated holes are arranged approximately by a radian of 90° along the outer circumference of the lateral surface of the abrasive body, this ensures that there is a sufficiently good view of the to be machined essentially for the entire turning process, even at low turning speeds surface is given, so that the grinder can see the grinding point and, for example, the change in the shading in the glass fiber reinforced plastic with increasing removal during the entire grinding process.

Ausgehend von den zuvor beschriebenen Ausbildungen des erfindungsgemäßen Schleifkörper, besteht ein weiteres Problem in der geeigneten Materialauswahl. So besteht das Bedürfnis mit dem erfindungsgemäßen Werkzeug unterschiedlichste Werkstoffgeometrien und Werkstoffoberflächen mit z.B. dunklen, matten als auch mit hellen, reflektierenden Oberflächen zu bearbeiten, sowie Materialien unterschiedlichster Härte. Bei der Herstellung von Schleifwerkzeugen werden oftmals metallische Materialien mit hoher Härte verwendet. Jedoch gestaltet sich die Bearbeitung mit metallisch glänzenden Werkzeugen besonders problematisch. Bei einem erfindungsgemäßen Schleifwerkzeug aus Metall besteht demnach die weitere Aufgabe darin, das Werkzeug dahingehend zu verbessern, dass eine gute Durchsichtmöglichkeit durch das Werkzeug bei unterschiedlichen Lichtverhältnissen gegeben ist. Da eine metallisch glänzende Werkzeugoberfläche jedoch einfallendes Licht stärker reflektiert als z.B ein zu bearbeitendes mattes Verbundmaterial, ist damit die Streulichtintensität infolge der Reflexion größer als die Intensität des Lichtes, welches durch die Öffnungen hindurch in das Auge des Betrachters zurück von der Materialoberfläche reflektiert wird.Based on the above-described configurations of the grinding body according to the invention, there is a further problem in the selection of a suitable material. There is a need to use the tool according to the invention to process a wide variety of material geometries and material surfaces with, for example, dark, matt and light, reflective surfaces, as well as materials of the most varied hardness. Metallic materials with high hardness are often used in the manufacture of grinding tools. However, machining with shiny metallic tools is particularly problematic. In the case of a grinding tool made of metal according to the invention, the further object is to improve the tool to the effect that there is a good possibility of looking through the tool under different lighting conditions. However, since a shiny metallic tool surface reflects incident light more than, for example, a matt composite material to be processed, the scattered light intensity due to the reflection is greater than the intensity of the light that is reflected back from the material surface through the openings into the eye of the observer.

In einer weiter bevorzugten Ausführungsform der Erfindung wird daher das Schleifwerkzeug aus einem metallischen Material mit einer Oberfläche mit einem hohem Lichtabsorptionsgrad LAW im Wellenlängenbereich des sichtbaren Lichts, insbesondere im Wellenlängenbereich λ zwischen 380 - 780 nm ausgebildet. Auf diese Weise ist sichergestellt, dass der Lichtreflexionsgrad LRW und damit die Streulichtreflexion von der Werkzeugoberfläche niedrig ist. Folglich wird der Quotient aus dem Lichtreflexionsgrad LRM der zu bearbeitenden Materialoberfläche zu dem Lichtreflexionsgrad LRw der Werkzeugoberfläche mit zunehmender Erhöhung des Lichtabsorptionsgrad LAw größer und damit besser für den Bearbeiter, da das jeweils von der zu bearbeitenden Oberfläche zurück reflektierte Licht eine relativ höhere Intensität hat verglichen zu einer stark reflektierenden Werkzeugoberfläche.In a further preferred embodiment of the invention, the grinding tool is therefore made from a metallic material with a surface having a high degree of light absorption LA W in the wavelength range of visible light, in particular in the wavelength range λ between 380-780 nm. This ensures that the degree of light reflection LR W and thus the reflection of scattered light from the tool surface is low. Consequently, the quotient of the degree of light reflection LR M of the material surface to be processed to the degree of light reflection LR w of the tool surface increases as the degree of light absorption LA w increases and is therefore better for the processor, since that depends on the surface to be processed reflected light has a relatively higher intensity compared to a highly reflective tool surface.

In einer bevorzugten Ausbildung der Erfindung weist der Schleifkörper eine Oberfläche auf, die mit einem hohem Lichtabsorptionsgrad oberhalb von 80% im Wellenlängenbereich λ zwischen 380 - 780 nm ausgebildet ist, so dass die Oberfläche dunkel bis schwarz erscheint und nur geringes Streulicht zurückreflektiert.In a preferred embodiment of the invention, the abrasive body has a surface that is designed with a high degree of light absorption above 80% in the wavelength range λ between 380-780 nm, so that the surface appears dark to black and reflects only little scattered light.

Weiter bevorzugt ist es, wenn der Schleifkörper eine schwarze Oberfläche aufweist, die mit einem hohem Lichtabsorptionsgrad von nahezu 100% im Wellenlängenbereich λ zwischen 380 - 780 nm ausgebildet ist. Vorteilhaft ist es dabei, den Schleifkörper mit einer schwarzen Oberflächenbeschichtung zu versehen, vorzugsweise einer matten schwarzen Oberflächenbeschichtung, wie zum Beispiel einem schwarzen Lack.It is further preferred if the abrasive body has a black surface which is formed with a high degree of light absorption of almost 100% in the wavelength range λ between 380-780 nm. It is advantageous here to provide the abrasive body with a black surface coating, preferably a matt black surface coating, such as a black lacquer.

Weiter bevorzugt ist es, wenn die Oberflächenbeschichtung eine hitzebeständige Beschichtung darstellt, die den zu erwartenden Temperaturen beim Schleifvorgang thermisch standhält. So kann zum Beispiel die Oberfläche des Schleifkörpers mit einem hitzebeständigen mattschwarzen Lack versehen werden.It is further preferred if the surface coating is a heat-resistant coating that thermally withstands the temperatures to be expected during the grinding process. For example, the surface of the grinding wheel can be coated with a heat-resistant matt black paint.

Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben bzw. werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführungsform anhand der Figur näher erläutert.Other advantageous developments of the invention are specified in the dependent claims or are explained in more detail below together with the description of the preferred embodiment with reference to the figure.

Es zeigt:

Fig. 1
ein erfindungsgemäßes Schleifwerkzeug mit einem hohlzylinderförmigen Schleifkörper und darin angebrachten Öffnungen; und
Fig. 2
ein alternatives Ausführungsbeispiel eines erfindungsgemäßes Schleifwerkzeug mit einem hohlzylinderförmigen Schleifkörper und darin angebrachten Öffnungen;
Fig. 3
ein weitere Ausführungsbeispiel eines erfindungsgemäßes Schleifwerkzeug mit einem hohlzylinderförmigen Schleifkörper; und
Fig. 4
eine ähnliche Ausführung zu Fig.3 eines erfindungsgemäßes Schleifwerkzeug mit einem kegelförmigen Schleifkörper und darin angebrachten Öffnungen.
It shows:
1
a grinding tool according to the invention with a hollow-cylindrical grinding body and openings provided therein; and
2
an alternative embodiment of a grinding tool according to the invention with a hollow-cylindrical grinding body and openings therein;
3
a further exemplary embodiment of a grinding tool according to the invention with a hollow-cylindrical grinding body; and
4
a similar execution Fig.3 a grinding tool according to the invention with a conical grinding body and openings provided therein.

In der Fig. 1 ist ein Schleifwerkzeug 1 mit einem um eine Drehachse 3 drehbaren Schleifkörper 2 gezeigt. Die Drehachse 3 verläuft durch die Zylindermittelachse des Schleifkörpers 2. Der Schleifkörper 2 ist mit einer Welle 10 verbunden, die mit einem Antrieb, wie zum Beispiel einem Drehantrieb, gekoppelt werden kann, um das Schleifwerkzeug 1 in Drehbewegung zu versetzen. Der Schleifkörper 2 ist als ein hohlzylinderförmiger Schleifkörper ausgebildet. Der zylinderförmige Schleifkörper 2 weist einen Mantel 7 auf mit einer Mantelfläche 6. Die Mantelfläche 6 bildet die Schleiffläche des Schleifkörpers 2 und erstreckt sich in Höhenrichtung H, die parallel zur Drehachse 3 des Schleifwerkzeugs 1 orientiert ist.In the 1 a grinding tool 1 with a grinding body 2 rotatable about an axis of rotation 3 is shown. The axis of rotation 3 runs through the central cylinder axis of the grinding body 2. The grinding body 2 is connected to a shaft 10 which can be coupled to a drive, such as a rotary drive, in order to set the grinding tool 1 in rotary motion. The grinding wheel 2 is designed as a hollow-cylindrical grinding wheel. The cylindrical grinding body 2 has a casing 7 with a lateral surface 6. The lateral surface 6 forms the grinding surface of the grinding body 2 and extends in the vertical direction H, which is oriented parallel to the axis of rotation 3 of the grinding tool 1.

Im Schleifkörper 2 sind bezüglich der Drehachse 3 diametral gegenüberliegende Öffnungen 4a, 4b und zwar Langlöcher angeordnet.Diametrically opposite openings 4a, 4b, specifically elongated holes, are arranged in the grinding body 2 with respect to the axis of rotation 3.

Die Langlöcher 4a, 4b erstrecken sich mit ihrer Längserstreckung quer zur Drehachse bzw. quer zur Höhenrichtung H in Umfangsrichtung. Es ist ferner zu erkennen, dass zwei Langlöcher 4a parallel zueinander angeordnet sind und eine Länge entsprechend dem Bogenmaß von 70° - 80° im Mantel 7 aufweisen und fensterartigen Öffnungen im Mantel 7 darstellen. Hierdurch kann der Schleifer beim Schleifen durch die Öffnungen in der Mantelfläche 6 bzw. im Mantel 7 des Schleifkörpers 2 durch jeweils zwei paarweise gegenüberliegende Öffnungen 4a, 4b hindurchschauen.The elongated holes 4a, 4b extend with their longitudinal extent transversely to the axis of rotation or transversely to the height direction H in the circumferential direction. It can also be seen that two elongated holes 4a are arranged parallel to one another and have a length corresponding to radians of 70°-80° in the jacket 7 and represent window-like openings in the jacket 7 . This allows the grinder during grinding through the openings in the lateral surface 6 and in the jacket 7 of the grinding body 2 through two pairs of opposing Openings 4a, 4b look through.

Es ist ferner ersichtlich, dass zwei weitere, sich diametral gegenüberliegende Öffnungen 4a, 4b um ca. 90° in Umfangrichtung zu den zuvor beschriebenen Öffnungen 4a, 4b versetzt angeordnet sind. Die Länge der Langlöcher 4a, 4b ist in dem hier gezeigten Ausführungsbeispiel gemäß Fig. 1 in etwa identisch. Allerdings können auch unterschiedliche Längen von Langlöchern im Mantel 7 des Schleifkörpers 2 angeordnet werden.It can also be seen that two further diametrically opposite openings 4a, 4b are offset by approximately 90° in the circumferential direction to the openings 4a, 4b described above. The length of the elongated holes 4a, 4b is in accordance with the embodiment shown here 1 roughly identical. However, slots of different lengths can also be arranged in the casing 7 of the grinding body 2 .

In einem hier nicht dargestellten Ausführungsbeispiel könnte der zylinderförmige Schleifkörper 2 auch als Vollzylinder ausgebildet sein. In einer solchen Ausführungsform müssten die jeweils gegenüberliegenden Öffnungen 4a, 4b mittels einer die Öffnungen verbindenden Aussparung durch den zylinderförmigen Schleifkörper hindurch miteinander so verbunden sein, dass eine Durchsichtmöglichkeit gegeben ist.In an exemplary embodiment not shown here, the cylindrical grinding body 2 could also be designed as a solid cylinder. In such an embodiment, the respectively opposite openings 4a, 4b would have to be connected to one another by means of a cutout connecting the openings through the cylindrical abrasive body in such a way that a view-through possibility is provided.

Insofern kann die Aussparung 5 alternativ zu der in Fig. 1 gezeigten zylinderförmigen Form auch anders ausgebildet sein, sofern sichergestellt ist, dass jeweils zwei diametral gegenüberliegende Öffnungen 4a, 4b miteinander so verbunden sind, dass eine Durchsichtsmöglichkeit durch den Schleifkörper 2 erhalten wird.In this respect, the recess 5 can be used as an alternative to the 1 shown cylindrical shape can also be designed differently, provided it is ensured that two diametrically opposite openings 4a, 4b are connected to each other so that a view through the abrasive body 2 is obtained.

In Fig. 2 ist ein alternatives Ausführungsbeispiel eines erfindungsgemäßes Schleifwerkzeug 1 mit einem hohlzylinderförmigen Schleifkörper 2 und darin angebrachten, parallel zur Höhenrichtung H verlaufende Öffnungen 4a, 4b gezeigt, wobei jeweils zwei diametral gegenüberliegende Öffnungen 4a, 4b so angeordnet sind, dass eine Durchsichtmöglichkeit durch den Schleifkörper 2 erhalten wird. Die Oberfläche der Schleifkörper ist in den Ausführungen der Fig. 1 und Fig. 2 bevorzugt mattschwarz und hitzebeständig beschichtet.In 2 shows an alternative exemplary embodiment of a grinding tool 1 according to the invention with a hollow-cylindrical grinding body 2 and openings 4a, 4b arranged therein and running parallel to the vertical direction H, with two diametrically opposite openings 4a, 4b being arranged in such a way that the possibility of looking through the grinding body 2 is obtained . The surface of the grinding wheel is in the versions of the 1 and 2 preferably matt black and heat resistant coated.

In der Figur 3 ist ein weiteres Ausführungsbeispiel eines erfindungsgemäßes Schleifwerkzeug 1 mit einem hohlzylinderförmigen Schleifkörper 2 gezeigt. Der Schleifkörper 2 ist besonders laufruhig ausgebildet und weist eine besonders gute Durchsichtmöglichkeit aufgrund der effektiv großen Öffnungen 4a, 4b auf. Die Öffnungen sind in einer Dreiecksform mit abgerundeten Ecken 9 ausgebildet. Zum einen sind die Öffnungen 4a, 4b so geformt, dass die dazwischen angeordneten Stege 8 des Schleifkörpers 2 (in Bezug auf die Drehachse 3) diagonal verlaufen. Zum anderen sind die Öffnungen 4a, 4b mit abgerundeten Ecken 9 ausgebildet. Durch die Form und insbesondere die diagonale Anordnung der Stege 8 wird bewirkt, dass anders als bei parallel zur Drehachse 3 orientieren Stegen 8, der wirksame Eingriff eines diagonalen Stegs 8 mit der zu bearbeitenden Oberfläche während der Drehung nicht gleichzeitig über den gesamten Stegabschnitt erfolgt, sondern allmählich entlang des Steges 8 einsetzt. Dies verbessert die Laufruhe des Schleifwerkzeuges 1.In the figure 3 a further exemplary embodiment of a grinding tool 1 according to the invention with a hollow-cylindrical grinding body 2 is shown. the Grinding body 2 is designed to run particularly smoothly and has a particularly good view-through option due to the effectively large openings 4a, 4b. The openings are formed in a triangular shape with rounded corners 9 . On the one hand, the openings 4a, 4b are shaped in such a way that the webs 8 of the grinding wheel 2 arranged between them run diagonally (with respect to the axis of rotation 3). On the other hand, the openings 4a, 4b are formed with rounded corners 9. The shape and in particular the diagonal arrangement of the webs 8 has the effect that, unlike webs 8 oriented parallel to the axis of rotation 3, the effective engagement of a diagonal web 8 with the surface to be machined during the rotation does not take place simultaneously over the entire web section, but instead gradually along the web 8 begins. This improves the smooth running of the grinding tool 1.

Weiter ist in der Figur 4 eine, zu der Ausführung in Figur 3, ähnliche Ausführung dargestellt bei der ebenfalls die Öffnungen 4a, 4b in einer Dreiecksform mit abgerundeten Ecken ausgebildet sind, wobei die zwischen je zwei Öffnungen liegenden Stege 8 als diagonale Stege ausgebildet sind. Hierbei ist das Schleifwerkzeug 1 allerdings mit einem kegelförmigen Schleifkörper 2 ausgebildet.Next is in the figure 4 one, to run in figure 3 , Similar embodiment shown in which the openings 4a, 4b are also formed in a triangular shape with rounded corners, the webs 8 lying between each two openings being formed as diagonal webs. In this case, however, the grinding tool 1 is designed with a conical grinding body 2 .

Claims (12)

  1. Sanding tool (1) having a sanding body (2) that is rotatable about an axis of rotation (3), wherein the lateral surface (6) of the sanding body (2) is configured as intended as a sanding surface for sanding, characterized in that the sanding body (2) has at least two openings (4a, 4b), passing through the sanding body (2), on diametrically opposite sides of the lateral surface (3) with respect to the axis of rotation (3), said openings (4a, 4b) being arranged such that a sander can see through the rotating sanding body (2) while sanding, wherein, for this purpose, several pairs of diametrically opposite openings (4a, 4b) are arranged in the sanding body (2) so as to be offset in a vertical direction H and in a circumferential direction from one another and the openings (4a, 4b) are optionally in the form of slots which are oriented along or transversely to the axis of rotation (3) or are in the form of triangles with rounded corners (9) in the sanding body (2) .
  2. Sanding tool (1) according to Claim 1, characterized in that the sanding body (2) is in the form of a cylindrical sanding body (2) that is rotatable about the cylinder axis.
  3. Sanding tool (1) according to Claim 1, characterized in that the sanding body (2) is in the form of a conical sanding body (2) that is rotatable about the cone longitudinal axis.
  4. Sanding tool (1) according to Claim 1 or 2, characterized in that the sanding body (2) is in the form of the hollow-cylindrical sanding body and the interior space of the sanding body (2) forms a recess (5).
  5. Sanding tool (1) according to one of the preceding claims, characterized in that a recess (5) is formed in the sanding body (2) between respective pairs of diametrically opposite openings (4a, 4b), such that it is possible to see through the sanding body (2) between two opposite openings (4a, 4b).
  6. Sanding tool (1) according to Claim 1 having transversely extending slots (4a, 4b), characterized in that the slots (4a, 4b) extend in a transverse direction with respect to the axis of rotation through an arc measure of about 50° to 100°, preferably between 80° and 90° degrees.
  7. Sanding tool (1) according to one of the preceding claims, characterized in that in each case two diametrically opposite openings (4a, 4b) are arranged in the sanding body (2) so as to be oriented parallel to one another in the axial height direction H.
  8. Sanding tool (1) according to one of the preceding claims, characterized in that the sanding body (2) consists of a metal material and the surface of the sanding body (2) is formed with a high degree of light absorption in the wavelength range of visible light, in particular in the wavelength range λ between 380-780 nm.
  9. Sanding tool (1) according to one of the preceding claims, characterized in that the sanding body (2) has a surface which is formed with a high degree of light absorption above 80% in the wavelength range λ between 380-780 nm.
  10. Sanding tool (1) according to one of the preceding claims, characterized in that the sanding body (2) has a black surface which is formed with a high degree of light absorption of virtually 100% in the wavelength range λ between 380-780 nm.
  11. Sanding tool (1) according to one of the preceding claims, characterized in that the sanding body (2) is provided with a black surface coating, preferably a matt, heat-resistant black surface coating.
  12. Sanding tool (1) according to one of the preceding claims having openings (4a, 4b) in the form of triangles with rounded corners (9), which have been formed in the sanding body (2) such that a web (8) oriented diagonally to the axis of rotation (3) is formed between in each case two adjacent openings (4a, 4b).
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DE102013218233.3A DE102013218233A1 (en) 2013-05-02 2013-09-11 Rotating grinding tool
PCT/EP2014/057509 WO2014177374A1 (en) 2013-05-02 2014-04-14 Rotary grinding tool

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US3841034A (en) * 1972-11-10 1974-10-15 G Held Tread grinding wheel

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EP2991804A1 (en) 2016-03-09
DE102013218233A1 (en) 2014-11-06

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