Patent Application
20250162104
The invention relates to a grinding means according to the preamble of claim 1.
WO 2007/144915 A1 discloses a grinding disc having a grinding element and having a plurality of holes that provide information.
The object of the invention is to improve a grinding means, in particular a grinding disc, by means of simple design measures.
The task is solved with a grinding means, in particular a grinding disc, for grinding a workpiece, having an, in particular flexible, support element, having a plurality of grinding elements for grinding a workpiece, and having a base binder element for arranging the grinding elements on the support element, in particular on a grinding side of the support element.
In particular, the support element may comprise a grinding region and, adjoining the grinding region, a free region. Preferably, the free region is free from the, in particular each, base binder element.
It is proposed that the grinding region forms an information pattern.
By means of the grinding means according to the invention, a user of the grinding means can obtain information in a particularly fast and reliable manner starting from the information pattern. Particularly advantageously, the information can be obtained in a state of the grinding means arranged on a machine tool. By having the information pattern arranged on a grinding side, the grinding means is not required to be removed from the machine tool to be able to obtain the information from the information pattern. In addition, a larger grinding region is thereby achieved by forming the information pattern through the grinding region and, for example, not through ventilation holes in the grinding means, which in turn weaken the grinding means.
In particular, a “grinding means” is understood to mean a means that forms an accessory device of a grinding machine, in particular an eccentric grinding machine, and in operation is directly in contact with the accessory device for removing material.
The grinding means may have a longitudinal extension or—in the case of a disc—a diameter of up to 500 mm, in particular up to 400 mm, preferably up to 300 mm, preferably up to 200 mm, more preferably up to 170 mm, such as 150 mm or even less.
The grinding means may have a thickness of up to 5 mm, in particular up to 3 mm, preferably up to 2 mm, preferably up to 1 mm, particularly preferably up to 0.5 mm, such as 0.4 mm or even less.
In order to compensate for local imperfections and to provide an optimum ground surface, the grinding means can be flexible. “Flexible” is understood to mean, in particular, formed from or containing a pliable material.
The grinding means may have a support element, in particular in the form of a carrier layer, with a grinding side and a retaining side facing away from the grinding side. The grinding side may have a plurality of grinding elements, which are arranged directly or indirectly on the support element and/or connected to the support element, in particular by means of a base binder element. The support element may be formed from a paper, a film, a fabric, a fiber, etc., or from a combination. However, other materials that appear to be advantageous to a person skilled in the art are also conceivable. The grinding elements may form a grinding means layer. The grinding means layer may have a grain.
The retaining side may comprise a fastening means. The fastening means may be provided for an arrangement of the grinding means on a machine tool, in particular a grinding plate of a machine tool. The fastening means may comprise a mechanical connecting element, for example a hook and loop fastener element, a screw fastener element or a clamp locking element. The fastening means may comprise an adhesive connecting element, such as an adhesive locking element.
In this context, a “grinding element” is understood to mean an element that has a deforming and/or abrasive effect on the workpiece to be processed. A grinding element may be formed by a cutting grain, which is made in particular of a mineral and/or ceramic material, such as diamond, corundum, silicon carbide, boron nitride, etc. The cutting grain may be made of a carbide or other material that appears useful to a person skilled in the art. In this case, the cutting grain may have any geometric configuration that appears useful to a person skilled in the art, for example a 2-dimensional or 3-dimensional geometric configuration, for example as a triangle, rectangle or trapezoid, or as a cube, pyramid or cone. A grinding element may be at least partially formed as an edge, corner, or peak of a surface structure causing increased friction and temperature on the workpiece to be processed, which imparts a deforming and/or abrasive effect on or into the workpiece to be processed.
The grinding element or cutting grain may be formed as a broken or a shaped cutting grain.
The base binder element may extend in sections over the support element, in particular dot-by-dot or substantially over the entire surface. The base binder element may comprise or consist of polyurethane, epoxy, latex, acrylate, vinyl acetate, etc. The, in particular each, base binder element may be formed as a discrete dot.
The base binder element may surround or wrap around the grinding element to retain the grinding element to the supporting element in a material, force, and/or form fit.
The base binder elements may be arranged on the support element and may be scattered with grinding elements by means of a scattering device, such as a conventional electrostatic scattering system. The grinding elements may adhere to the regions coated with the base binder element. The, in particular excess, grinding elements, which do not adhere to the base binder element, can be removed from the support element by means of a conveyor device, such as an exhaust device or a vibration of the grinding means.
In particular, the information pattern is intended to provide information by means of a partially or fully formed pattern. For example, the pattern may depict a number, a letter, a color, an image, a symbol, etc. The information pattern may have an information contour forming information. The information pattern may be formed from a plurality of information elements. The information elements may form the information pattern in a synopsis of the information elements. The information elements may form a composite of the information pattern. The information elements may be spaced apart from one another. The information elements may form an outline that allows the operator of the grinding means to infer information. Furthermore, in this context, an “information pattern” is to be understood to mean in particular an arrangement of information elements. The information pattern may be formed by a grinding region, in particular a contour of the grinding region. The information pattern may be configured as a pattern of the grinding region.
The information pattern may depict a, in particular medium, diameter of grinding elements (grain) arranged on the grinding means. The information pattern may depict a diameter of the grinding means.
The dependent claims specify further advantageous embodiments of the grinding means according to the invention.
It may be advantageous for the grinding region to be formed by a base binder element delimiting the grinding region. The, in particular each, base binder element may delimit the grinding region. Furthermore, it may be advantageous for the grinding region to be formed from a plurality of, in particular spaced apart, base binder elements. The base binder elements may be formed as dots. The base binder elements may be formed in the form of islands, in particular of base binder islands. The base binder elements may have an extension or diameter of less than 3 mm, in particular less than 2 mm, preferably less than 1 mm, for example 0.7 mm. The base binder element may be formed from or consist of a phenolic resin, urea resin, polyurethane resin, polyester resin, optionally also UV-curing, etc. The base binder element may be cured for specific materials or depending upon the base binder element used. The grinding region may be formed from a base binder element and/or from a plurality of base binder elements. The grinding region may be formed from a plurality of spaced apart base binder elements. The base binder elements in the grinding region may be arranged in close proximity to each other. The base binder elements may receive a plurality of grinding elements and hold them, in particular bundled, on the support element. As a result, regions or channels, which are free from a base binder element or grinding elements, are provided in the grinding region between the base binder elements. These regions or channels may be provided for optimum dust transport.
Furthermore, it may be advantageous for the grinding region to be surrounded by the free region. Furthermore, it may be advantageous for the grinding region to surround the free region. In addition, it may be advantageous for the free region to be substantially delimited by a plurality of base binder elements, in particular the grinding region. The grinding region and the free region may have different visual characteristics. The grinding region and the free region, in particular their delimitations to one another, may form a contrast. The contrast may form the information pattern. As a result, information may be provided to the user in a particularly straightforward manner.
Furthermore, it may be advantageous for the grinding means to have an opening, in particular an extraction opening, in particular to remove grinding dust. The opening may be arranged in the free region. The opening may be spaced apart from the grinding region. The opening may extend through the support element, in particular through the entirety of the grinding means. The opening may be configured as a breakthrough.
In this context, an “opening” is to be understood in particular to mean a continuous hole, in particular through the entire material thickness of the grinding means. The opening may be configured as a round hole. However, it is also conceivable for the person skilled in the art to consider other hole shapes to be useful, such as triangles, rectangles, squares, polygons, stars, or combination of these hole shapes. The opening may have a diameter of up to 10 mm, in particular up to 7 mm, preferably up to 5 mm, preferably up to 4 mm, more preferably up to 3 mm, such as 2.4 mm or even less.
It may be advantageous for the opening and the grinding region to delimit the free region. The opening may be surrounded by the free region, in particular entirely, preferably in a plane by 360°. The opening may be delimited by the free region. This can prevent a grinding element from being hit or punched or laser-cut during manufacture of an opening by, for example, a stamping process or a laser cutting method, which can minimize wear during manufacture.
It may further be advantageous for the opening to have an extension and for the free region to have an extension, wherein the, in particular each, extension of the opening is smaller than the, in particular each, extension of the free region. As a result, an opening can be particularly advantageously punched into the free region, provided that the extension of the free region is larger than the opening to be provided.
In addition, it may be advantageous for the free region to comprise at least two openings.
It may be advantageous for the grinding means to have an information element, in particular formed as an information coating 28, arranged on the support element. In particular, the information element is configured as an information coating 28. The information element may be configured as an imprint. The information element may be provided or printed on the support element, in particular a grinding side of the support element, by means of a printing method, for example an ink jet printing method, a laser printing method, etc. The information element may be printed directly on the grinding side. The information element may be depicted as a color image. An information element may thereby be particularly simply introduced.
It is proposed that the grinding means has a cover binder element covering the base binder element and the grinding elements. The cover binder element may have an aqueous consistency. The cover binder element may be received by means of a capillary effect between a plurality or a bundle of grinding elements. A plurality of grinding elements may form cavities lying on a substantially dot-shaped base binder element in which the cover binder element, in particular by means of the capillary effect, is received. The cavities between the grinding elements may receive the cover binder element. The cavities may retract the cover binder element between the grinding elements.
Furthermore, it is proposed that the grinding means comprises a further cover binder element that covers the cover binder element. The cover binder element may be provided as a function of a size, in particular a diameter, of the grinding element. For example, if the grinding elements are of fine size, a cover binder element may be omitted. A fine, in particular medium, size of the grinding elements may be achieved at less than 400, in particular less than 300. It is to be understood that a further cover binder element may be provided. The cover binder element or the further cover binder element can be cured for specific materials or as a function of the cover binder element or further cover binder element used. The further cover binder element may be formed or consist of stearate, in particular a fatty acid. The further cover binder element may be provided for a receptacle and/or for gluing grinding dust. The further cover binder element may form a type of fat layer on the cover binder element. The fat layer may be provided as a separation layer, which is intended to avoid or at least reduce clogging or blocking of the grinding side of the grinding means. As a result, a grinding result may be optimized.
It is further proposed that the cover binder element is formed from a non-transparent material. The cover binder may be formed from a non-transparent material that is formed so thinly on the grinding means such that the cover binder is translucent. An element is understood to be “translucent” if something behind the element is recognizable, in particular in a visible spectrum. For example, a translucent material may be translucent to radiation of the visible spectrum. It is understood that a translucent material may be determined by the fact that it is translucent to an operator or a human eye (without use of technical devices). A visible spectrum is to be understood in particular to mean electromagnetic radiation with wavelengths between about 380 nm and 750 nm. The cover binder element may be uncolored. The cover binder element may be at least 30%, in particular at least 50%, preferably at least 60%, preferably at least 70%, further preferably at least 80%, in particular preferably at least 90% transparent.
It is proposed that the cover binder element has a layer thickness of less than 100 μm, particularly less than 50 μm, preferably less than 20 μm, preferably less than 10 μm, further preferably less than 5 μm, more preferably less than 2 μm. The thinner a layer thickness of the cover binder element, the more flexible the grinding means. In particular, the cover binder element may be translucent depending on a layer thickness of the cover binder element.
It is further proposed that the base binder element has an extension, in particular a diameter, preferably a maximum diameter, of less than 10 mm, in particular less than 8 mm, preferably less than 5 mm, preferably less than 3 mm, further preferably less than 1 mm, more preferably less than 0.5 mm.
It is further proposed that the grinding means has a plurality of base binder elements spaced apart from one another, wherein the base binder elements are configured on the information element, in particular the information coating 28.
It is proposed that the grinding elements are formed while avoiding scattering of support elements. “Support elements” are understood to mean a, in particular ordinary, grinding element which is provided, in particular primarily, for supporting the grinding elements. The support element may have a size, in particular an average diameter, which is smaller than the grinding element, in particular by one size, in particular by two sizes smaller. The support elements are provided for preventing or at least avoiding a tilt or an orientation of the grinding elements in a grinding state of the grinding means. Otherwise, the grinding elements would tend to slip. The support element may be attached to the cover binder element. The support element is provided to harden or stiffen the cover binder elements.
It is further proposed that the information element, in particular the coating, is arranged on the support element, in particular on the grinding side of the support element, by means of a printing method, in particular an ink jet printing or a laser printing method.
It is further proposed that the information element forms a colored information element.
Further aspects of the invention relate to the following methods.
A method, in particular for manufacturing a grinding means, comprising the steps of:
A method, in particular for manufacturing a grinding means, comprising the steps of:
The insertion unit may be configured as a punching unit or as a laser cutting unit. An orientation of the insertion unit can be configured as a function of a detection of the free region, in particular a position of the free region.
An arrangement of the grinding elements on the support element, in particular on a grinding side of the support element, can be provided with a dot-shaped or a flat base binder element.
A detection of an extension of the free region may be detected by the detection unit.
To optimally position the openings, a computing unit can detect an, in particular each, extension of the free region and can match an, in particular each, extension of the opening to be introduced, in particular by means of a computing unit. This allows the opening to be optimally positioned.
An arrangement of the opening may be made by means of the insertion unit, in particular as a function of the adjustment preferably insofar as the, in particular each, extension of the free region is the same as or greater than the, in particular each, extension of the opening to be introduced.
It may be advantageous for the grinding means to have an edge region, which delimits an, in particular maximum, extension of the grinding means and is free from a base binder element. The edge region may extend circumferentially around the grinding means. The edge region may extend along the entire extension of the grinding means on the grinding side. The edge region of the grinding means can be exposed.
As a result, robust grinding means may be provided. This prevents or at least reduces tearing of the grinding means. In addition, tearing at an edge of the grinding means is prevented or at least reduced by a levering effect.
It may be advantageous for the grinding means to comprise a cover binder element covering the grinding region and the free region. The edge region may be free from the cover binder element.
It may further be advantageous for the edge region to be delimited by the grinding region. It may further be advantageous for the edge region to be delimited by the free region. Starting from a center point of the grinding means, the edge region may be delimited along a longitudinal extension and/or transverse, in particular perpendicular, to a longitudinal extension, by the grinding region on the one hand and by the free region on the other hand.
It may also be advantageous that the edge region is, on one hand, delimited by the maximum extent of the grinding means and, on the other hand, by a distance of less than 5 mm, in particular less than 4 mm, preferably less than 3 mm, preferably less than 2 mm, more preferably less than 1 mm. In particular, the edge region may, on one hand, be delimited by the maximum extension of the grinding means and, on the other hand, by a distance of more than 0.1 mm, in particular more than 0.2 mm, preferably more than 0.4 mm, preferably more than 0.5 mm, more preferably more than 0.8 mm. The edge region may be formed by an edge surface, in particular a diameter difference, preferably a maximum diameter difference, of less than 10 mm, in particular less than 8 mm, preferably less than 5 mm, preferably less than 3 mm, further preferably less than 1 mm. The edge region may be limited by a first extension, in particular a first longitudinal extension, preferably a first diameter. The edge region may be delimited by a second extension, in particular a second longitudinal extension, preferably a second diameter. The first extension may be less than 3%, more particularly less than 2%, preferably less than 1%, relative to the second extension. The edge region may have a distance from the edge of the grinding means used substantially independently of the grinding means or the grinding disc used. The spacing may be substantially equidistant for discs having a diameter of 80 mm, but also of 170 mm.
It is proposed that the grinding means comprises an opening, in particular for an extraction of grinding dust. The edge region is free from the, in particular each, opening. The edge region may be delimited by the opening. The edge region may be configured spaced apart from the, in particular each, opening.
The invention further relates to a hand-held power tool for receiving and operating a grinding means holding device and/or a grinding means.
The invention further relates to a grinding system comprising a hand-held power tool and a grinding means provided for driving the hand-held power tool.
Further advantages follow from the description of the drawings hereinafter. Exemplary embodiments of the invention are shown in the drawing. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will appropriately also consider the features individually and combine them into additional advantageous combinations. Shown are:
In the following drawings, identical components are provided with identical reference signs.
The figures each refer to a grinding means 11 configured as a grinding disc 11 for grinding workpieces. The grinding disc 11 according to the invention is universally usable and is particularly suitable for processing workpieces made of metal, rock, wood, plastic or a composite.
The grinding disc 11 is provided for releasably receiving rotationally driven commercially available machine tools. The grinding disc 11 can be received on a workpiece to be processed with a rotational and/or translational movement in a receiving device of a machine tool, preferably a hand-held machine tool, which is already known to a person skilled in the art and configured to receive the grinding disc 11. In particular, a translational feed is introduced into the tool in which the operator of the machine tool applies a force to the machine tool, in particular a machine tool housing.
The grinding disc 11 is provided for releasably receiving rotationally driven commercially available machine tools. The grinding disc 11 can be received in a receiving device of a machine tool already known to a person skilled in the art and configured to receive the grinding disc 11. However, the grinding disc 11 is detachably connected to the machine tool, in particular to a grinding plate or a support plate of the machine tool, by means of a material connection, such as an adhesive material connection, and/or by means of a hook-and-loop connection.
The support element 13 comprises a grinding region 21 and, adjoining the grinding region 21, a free region 23. The free region 23 is free from one or the, in particular each, base binder element 17. The grinding region 21 forms an information pattern 27.
The grinding disc 11 is disc-shaped and extends circumferentially around an axis of rotation and has a diameter of up to 150 mm. The grinding disc 11 has a thickness of up to 5 mm or even less.
To be flexible, the grinding disc 11 is made of a pliable material.
The support element 13 is configured as a carrier layer and comprises a grinding side 31 and a retaining side 33 facing away from the grinding side 31. The grinding side 31 has a plurality of grinding elements 15, which are arranged indirectly on the support element 13 and connected to the support element 13 by means of a base binder element 17. The support element 13 may be formed from a paper, a film, a fabric, a fiber, etc., or from a combination. The grinding elements 15 form a grinding means layer having a predetermined grain.
The retaining side 33 comprises a fastening means not shown in detail, which is provided for arranging the grinding means 11 on a grinding plate of a machine tool. The fastening means may comprise a mechanical connecting element, for example a hook and loop fastener element, a screw fastener element or a clamp locking element. The fastening means may comprise an adhesive connecting element, such as an adhesive locking element.
The grinding element 15 or cutting grain may be formed as a broken or a shaped cutting grain.
The base binder elements 17 extend in sections dot-by-dot over the support element 13 and are formed as more discrete dots. The base binder elements 17 surround the grinding elements 15 to retain them to the support element 13 in a material, force, and/or form fit manner.
The base binder elements 17 are arranged on the support element 13 and are scattered with grinding elements 15 by means of a conventional electrostatic scattering system. The grinding elements 15 adhere to the regions coated with the base binder element 17. The excess grinding elements 15, which do not adhere to the base binder element 17, are removed from the support element 13 by means of a conveyor device, such as an exhaust device or a vibration of the grinding means 11.
The information pattern 27 provides information by means of a partially or fully formed pattern. The information pattern 27 is described as a number (
The information pattern 27 depicts an average diameter of grinding elements 15 (grain) arranged on the grinding means 11.
The grinding region 21 is formed by a plurality of base binder elements 17 delimiting the grinding region 21. The base binder elements 17 delimit the grinding region 21. The grinding region 21 is formed from a plurality of base binder elements 17 spaced apart from one another. The base binder elements 17 are formed as dots and are configured in the form of base binder islands. The base binder elements 17 have an extension or diameter of less than 1 mm, for example 0.7 mm. The base binder elements 17 may be formed from a phenolic resin, urea resin, polyurethane resin, polyester resin, optionally also UV-curing, etc. The base binder elements 17 can be cured for specific materials or depending upon the base binder element 17 used. The base binder elements 17 in the grinding region 21 are arranged in close proximity to each other. The base binder elements 17 receive a plurality of grinding elements 15 and keep them bundled on the support element 13.
The grinding region 21 is surrounded by the free region 23 and the grinding region 21 surrounds the free region 23. The free region 23 is substantially delimited by a plurality of base binder elements 17 of the grinding region 21. The grinding region 21 and the free region 23 have different visual properties and form a contrast, which segment the regions. The contrast in turn forms the information pattern 27.
In
The grinding disc 11 has an opening 37 configured as an exhaust opening 37 for the extraction of grinding dust. The opening 37 is arranged in the free region 23 and is spaced apart from the grinding region 21. The opening 37 extends through the support element 13 or through the entire grinding disc 11 and is configured as a breakthrough of the entire material thickness of the grinding disc 11. The opening 37 has a circular-round hole shape and has a diameter of up to 3 mm.
The opening 37 and the grinding region 21 delimit the free region 23. The opening 37 is completely surrounded by the free region 23 in a plane by 360°. The opening 37 is delimited by the free region 23.
The opening 37 has an extension and the free region 23 has an extension, wherein each extension of the opening 37 is smaller than each extension of the free region 23.
The free region 23 comprises at least two openings 37.
The grinding means 11 has a cover binder element 39 covering the base binder element 17 and the grinding elements 15. The cover binder element 39 has an aqueous consistency and is received by means of a capillary effect between a plurality or a bundle of grinding elements 15. A plurality of grinding elements 15 forms cavities on a substantially dot-shaped base binder element 17 in which the cover binder element 39 is received by means of the capillary effect. The cavities between the grinding elements 15 receive the cover binder element 39. The cavities retract the cover binder element 39 between the grinding elements 15.
The grinding means 11 may comprise a further cover binder element 39, which covers the cover binder element 39. The cover binder element 39 may be provided as a function of a diameter of the grinding element 15. For example, if the grinding elements 15 are of fine size, a cover binder element 39 may be omitted. A fine or medium size of the grinding elements 15 may be achieved at less than 400, in particular less than 300. It is to be understood that a further cover binder element 39 may be provided. The cover binder element 39 or the further cover binder element 39 can be cured for specific materials or as a function of the cover binder element 39 or further cover binder element 39 used. The further cover binder element 39 may be formed from or consist of stearate, in particular a fatty acid. The further cover binder element 39 may be provided for a receptacle and/or for gluing grinding dust. The further cover binder element 39 may form a type of fat layer on the cover binder element 39. The fat layer may be provided as a separation layer, which is intended to avoid or at least reduce clogging or blocking of the grinding side 31 of the grinding means 11.
The cover binder element 39 is formed from a non-transparent material. The cover binder element 39 is formed from a non-transparent material that is formed so thinly on the grinding means 11 such that the cover binder element 39 is translucent. The cover binder element 39 is uncolored. The cover binder element 39 is at least 60% transparent.
The cover binder element 39 has a maximum layer thickness D at the free region 23 of less than 10 μm. Preferably, the cover binder element 39 has this maximum layer thickness D between two base binder elements 17n adjacent to each other. The thinner a layer thickness of the cover binder element 39, the more flexible the grinding means 11. The cover binder element 39 may be translucent depending on a layer thickness of the cover binder element 39.
The, in particular each, base binder element 17 has a maximum diameter of less than 1 mm. The base binder elements 17 are spaced apart from one another and formed on the information coating 28. The base binder elements 17 are applied to the information coating 28.
The information coating 28 may be arranged on the support element 13, in particular on the grinding side 31 of the support element 13 by means of a conventional printing method, in particular an ink jet printing or a laser printing method. Accordingly, the information coating 28 may be colored.
Further aspects of the invention relate to the following methods.
A method, in particular for manufacturing a grinding means 11, comprising the steps of:
A method, in particular for manufacturing a grinding means 11, comprising the steps of:
The insertion unit is configured as a laser cutting unit. An orientation of the insertion unit is provided as a function of a detection of a position of the free region 23. An arrangement of the grinding elements 15 on a grinding side 31 of the support element 13 is provided with a dot-shaped or a flat base binder element 17. A detection of an extension of the free region 23 may be detected by the detection unit. To optimally position the openings 37, a computing unit detects each extension of the free region 23 and adjusts each extension of the opening 37 to be introduced by means of the computing unit, whereby the opening 37 can be optimally positioned.
An arrangement of the opening 37 is provided by means of the insertion unit as a function of the adjustment, insofar as each extension of the free region 23 is the same or greater than each extension of the opening 37 to be introduced.
The grinding disc 11 has an edge region 41, which delimits the maximum diameter of the grinding disc 11 and is free from base binder elements 17 (
The grinding disc 11 comprises a cover binder element 39, which covers the grinding region 21 and the free region 23. The edge region 41 is free from the cover binder element 39.
The edge region 41 is delimited by the grinding region 21 and by the free region 23. Starting from a center point or a center axis of the grinding disc 11, the edge region 41 is delimited in the radial direction by the grinding region 21 on the one hand and by the free region 23 on the other hand.
The edge region 41 is delimited by a maximum diameter D1 of the grinding disc 11 and by a distance to the diameter of less than 3 mm. The edge region 41 is configured as an edge surface, which is formed by a diameter difference (D1−D2) of less than 8 mm, for example 6 mm. The edge region 41 has a distance to the edge of the grinding means 11 substantially independent of the grinding disc 11 used, which is substantially equidistant for grinding discs 11 having a diameter of 80 mm, but also of 170 mm.
The grinding disc 11 has an opening 37 for the extraction of grinding dust. The edge region 41 is free from each opening 37. The edge region 41 is formed spaced apart from each opening 37.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2021 215 122.1 | Dec 2021 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2022/087206 | 12/21/2022 | WO |
