Abrading flap disk and abrading tool

Abstract

The invention relates to an abrading flap disk (1) which can be rotationally driven about an axis of rotation (6a), wherein: the abrading flap disk (1) comprises a carrier plate (2) and abrading strips (3); the carrier plate (2) has a front side (8a) and a rear side (8b); the abrading strips (3) are connected to the carrier plate (2) by an integral bond (5), in particular an adhesive bond, on the front side (8a); on the front side, the carrier plate (2) has a delimiting contour (4) between the axis of rotation (6a) and the integral bond (5); the delimiting contour (4) extends at least as far in a positive direction as the integral bond (5); and the positive direction (7) corresponds to a direction from the rear side (8b) to the front side (8a) along the axis of rotation (6a).

Description

[0001] Flap disc and grinding tool

[0002] Description

[0003] The invention relates to a flap disc that can be driven rotationally about a rotational axis. The flap disc comprises a backing plate and abrasive flaps, the backing plate having a front and a back surface. The abrasive flaps are connected to the backing plate on the front surface by means of a material-bonded connection, in particular an adhesive bond. The invention further relates to an abrasive tool.

[0004] The publication EP 1 142 673 A2 discloses a grinding wheel for a grinding tool, wherein the grinding wheel comprises a carrier plate and grinding elements attached to the carrier plate. The grinding flaps extend over part of the circumference around the axis of rotation and are arranged overlapping like roof tiles on the annular carrier section. The grinding flaps form an annular coating on the carrier section, with the individual grinding flaps being attached by means of an adhesive.

[0005] A disadvantage of conventional grinding wheels is that the abrasive elements can detach from the backing plate during operation of the grinding tool due to high centrifugal forces. This can render the grinding wheel partially unusable or cause injuries. Therefore, the secure attachment of the abrasive elements to the backing plate is of paramount importance for safety. In particular, when using a metallurgical bond between the abrasive elements and the backing plate, a considerable amount of adhesive is used to ensure a sufficiently strong connection. However, this results in excessive adhesive consumption.The object of the present invention is to provide a flap disc which is characterized in particular by a reliable, material-bonded connection of the abrasive elements to the backing plate and / or reduces the amount of adhesive required to form the material-bonded connection. A further object is to provide an abrasive tool with such a flap disc.

[0006] The problem concerning the flap grinding wheel is solved by a flap grinding wheel having the features of claim 1. Advantageous embodiments are described in the dependent claims.

[0007] According to the invention, the flap disc is rotatably driven about an axis of rotation, comprising a backing plate and abrasive flaps, the backing plate having a front and a back, and the abrasive flaps being connected to the backing plate on the front by means of a material-bonded connection, in particular an adhesive bond. The backing plate has a boundary contour on the front, which is arranged between the axis of rotation and the material-bonded connection, the boundary contour extending at least as far in a positive direction as the material-bonded connection, and the positive direction corresponding to a direction from the back to the front along the axis of rotation.Without the boundary contour according to the invention, an adhesive for the bond could be distributed uncontrollably during the formation of the bond, due to the pressing action of the carrier plate against the abrasive flaps. In other words, the boundary contour prevents an adhesive for the bond from extending into an area of ​​the carrier plate during the bond formation where the adhesive cannot be used to form the bond.In other words, the boundary contour ensures that the adhesive of the bonded joint or adhesive bond only accumulates or is located in an area or at points on the backing plate where the bonded joint between the abrasive flaps and the backing plate is formed and / or is intended to be formed, and / or where it can contribute to the strength of the bonded joint. By extending at least as far in the positive direction as the bonded joint, the boundary contour can act as a barrier for the adhesive of the bonded joint or adhesive bond.In this way, a particularly strong, secure, and reliable bond, especially an adhesive bond, is formed between the abrasive flaps and the backing plate, since the defined contour ensures that most, almost all, or all of the adhesive used is available for forming the bond. At the same time, this significantly reduces the amount of adhesive used, as it is used extremely efficiently to form the bond, since no adhesive reaches areas where it cannot contribute to the strength of the bond.

[0008] In principle, it is preferred if the material-bonded connection is an adhesive bond. It is particularly preferred if the adhesive bond is formed by means of an adhesive or a binder. Such an adhesive or binder is preferably liquid or viscous during application and then hardens, thereby forming the material-bonded connection.

[0009] Within the scope of the disclosure of the invention, all embodiments relating to materially bonded connections preferably also relate to adhesive bonds. Furthermore, descriptions of adhesives also relate in particular to the binder.

[0010] A preferred embodiment is characterized in that the demarcation contour extends at least as far in a positive direction as a material-bonded connection directly adjacent to the demarcation contour.

[0011] Furthermore, it is generally preferred if the material-bonded connection is a fastening. In other words, it is preferred if the abrasive flaps are attached to the backing plate and / or the boundary contour by means of a material-bonded connection. The abrasive flaps are preferably flaps for grinding wood, stone, and / or metal. The flap disc is preferably also suitable or designed for this purpose.

[0012] The term "extension of the boundary contour in the positive direction" preferably means that the boundary contour extends in a direction from the back to the front of the backing plate, parallel to the axis of rotation of the flap disc. In other words, it can be understood that the bonded joint, viewed from a point on the axis of rotation, is completely or partially, or at least partially, obscured by the boundary contour, and that this point, in particular, is located on the axis of rotation at a positive distance from the backing plate and / or the boundary contour. In other words, a straight line from this point, directed towards the bonded joint, would intersect or penetrate the boundary contour. Such a straight line preferably runs at an angle of less than 80°, 70°, 60°, 50°, or 45° to the axis of rotation.This provides a particularly secure barrier for the adhesive during the production of the material-bonded connection, thanks to the demarcation contour.

[0013] Another embodiment of the invention is preferably characterized in that the material-bonded connection of the abrasive flaps to the backing plate is formed by a material-bonded connection, preferably an adhesive bond, between the abrasive flaps and the boundary contour. This preferably means that the abrasive flaps are at least connected to or attached to the boundary contour. In other words, they can also be additionally connected to other areas of the backing plate by means of the material-bonded connection. This results in a particularly secure connection or attachment of the abrasive flaps to the backing plate.

[0014] It is particularly preferred if the boundary contour extends at least as far as, or further than, the abrasive flaps in the positive direction when the flap disc or backing plate is arranged with its front facing upwards, i.e., against the direction of gravity, and the flap disc is not in operation. This ensures that the positive-locking connection between the boundary contour and the abrasive flaps is subjected to tensile stress only by centrifugal forces during operation of the flap disc. Regardless of this, it is preferred if the boundary contour, the material bond, and the abrasive flaps are dimensioned and / or arranged relative to each other such that the material bond is subjected predominantly, largely, or exclusively to tensile stress.This preferably means that the abrasive flaps in the operation of the flap disc pull on the material bond due to the rotation and the resulting centrifugal forces, which can ensure a higher strength of the material bond compared to other types of stress.

[0015] Another embodiment of the invention is preferably characterized in that the boundary contour extends further in the positive direction than the bonded joint. This increases the reliability with which it is prevented that the adhesive of the bonded joint overcomes the barrier formed by the boundary contour during the bonding process. Preferably, the boundary contour extends further in the positive direction than a region of the bonded joint that directly borders the boundary contour.

[0016] Another embodiment of the invention is preferably characterized in that the boundary contour and / or the bonded joint extends in the direction of rotation of the flap disc. In other words, the boundary contour and the bonded joint extend along a circular path such that the boundary contour forms a barrier for the adhesive of the bonded joint during the formation of the bonded joint along the entire circular path, in particular 360° around the axis of rotation of the flap disc. In this way, it is ensured that no such adhesive can enter an area of ​​the backing plate where the adhesive cannot contribute to the strength of the bonded joint.

[0017] Another embodiment of the invention is preferably characterized in that the material-bonded connection extends along the boundary contour only on one side of the boundary contour facing away from the axis of rotation. In this way, the adhesive of the material-bonded connection is used extremely efficiently. Furthermore, it is particularly preferred if the material-bonded connection borders the boundary contour and / or is bounded by the boundary contour. Preferably, this boundary is in the direction of the axis of rotation of the flap disc.

[0018] Another embodiment of the invention is preferably characterized in that the abrasive flaps form an overlapping area facing the boundary contour and extending along the side of the boundary contour that faces away from the axis of rotation. In this way, the overlapping abrasive flaps can be connected or fastened to the carrier plate and / or the boundary contour via the overlapping area by means of a material-bonded connection. This increases the strength of the material-bonded connection.

[0019] Another embodiment of the invention is preferably characterized in that the boundary contour is formed integrally with the carrier plate. Preferably, the boundary contour is formed by the deep-drawing manufacturing process, which greatly simplifies production. Production is further simplified if the basic shape or the overall shape of the carrier plate is formed simultaneously with the formation of the boundary contour, particularly by deep drawing. In this way, additional manufacturing steps, especially for forming the boundary contour, can be eliminated.

[0020] In principle, it is preferred if the support plate, regardless of the manufacturing process used, comprises metal or preferably consists of metal, particularly at least 90%. It is advantageous if the support plate is made of sheet metal, especially deep-drawn sheet metal.

[0021] In principle, it is advantageous if the support plate has a constant material thickness along its boundary contour, preferably in the direction of the axis of rotation, i.e., transversely to the axis of rotation of the support plate. Regardless of this, it is particularly preferred if the support plate generally has a constant material thickness. In principle, it is preferred if the contour or surface of the front of the support plate, particularly in a plane transverse or perpendicular to the axis of rotation of the support plate, has a continuous profile.

[0022] Another embodiment of the invention is preferably characterized in that the boundary contour is convex in a positive direction in a plane in which the axis of rotation runs. In other words, the convex shape is formed on the front side of the backing plate. Preferably, this convex or outwardly curved shape extends along the direction of rotation of the flap disc, particularly by 360° around the axis of rotation. Furthermore, it is preferred if a positively curved, i.e., concave, contour is formed on the back side of the backing plate along the boundary contour. It is particularly preferred if the backing plate thereby has a constant material thickness along the boundary contour. Regardless of this, it is particularly preferred if the backing plate has a constant material thickness. The backing plate can, regardless of this, be made of or comprise metal.

[0023] Preferably, the boundary contour in a plane in which the axis of rotation runs is convex and / or continuous and / or stepless in the positive direction compared to an immediately adjacent section of the support plate which is arranged facing the axis of rotation as seen from the boundary contour and / or compared to an immediately adjacent section of the support plate which is arranged away from the axis of rotation as seen from the boundary contour.

[0024] Another embodiment of the invention is preferably characterized in that the support plate has a radially outer edge section whose contour on the front side runs at an angle of 0° to 15° to a straight line perpendicular to the axis of rotation, particularly in the same plane, in the plane in which the axis of rotation is arranged. The radially outer edge section is preferably the outermost radial edge section or end section of the support plate, extending in particular 360° around the axis of rotation. The radially outer edge section is preferably designed such that the angle of its contour on the front side is constant relative to the straight line perpendicular to the axis of rotation.The radially outer edge section is preferably designed such that, during operation, particularly grinding operation, the abrasive flaps of the flap disc are supported by this section. In other words, the radially outer edge section can serve to support the abrasive flaps or flap segments arranged on this edge section or to press them towards the workpiece being ground. This ensures extremely high stability during operation of the flap disc.Preferably, the angle, when greater than 0° and at most 15°, is formed between the line perpendicular to the axis of rotation and another line, wherein the line perpendicular to the axis of rotation, the other line, and the axis of rotation are arranged in the same or a common plane, the other line intersecting the axis of rotation at a point spaced in the positive direction from the point where the line perpendicular to the axis of rotation intersects the axis of rotation, and wherein the contour of the radially outer edge section extends along the other line on the front surface. In other words, it is preferred that the radially outer edge section, in the direction of the axis of rotation, has a positive slope on the front surface in a plane in which the axis of rotation lies, when the angle is greater than 0°.In other words, the contour of the radially outer edge section extends in a positive direction with decreasing distance to the axis of rotation if the angle is greater than 0°.

[0025] Alternatively, particularly when dealing with abrasive flaps with a rectangular cross-section, the contour of the backing plate extends on the front surface from a radially outer edge of the backing plate to the boundary contour at a constant angle to a straight line perpendicular to the axis of rotation. Preferably, the material bond between the abrasive flaps, especially those with a rectangular cross-section, and the front surface extends over at least 50%, 70%, 80%, 90%, 95%, or 100% of the common overlap area between the abrasive flaps and the backing plate. This increases the strength of the bond. The material bond preferably extends from the boundary contour towards the radially outer edge of the backing plate.

[0026] Another embodiment of the invention is preferably characterized in that the carrier plate has at least one connecting section that connects the edge section to the boundary contour, that the contour of the at least one connecting section on the front of the carrier plate has a larger angle to the line perpendicular to the axis of rotation in the plane in which the axis of rotation is arranged than the contour of the radially outer edge section, and that, in particular, the carrier plate has a mounting hub on the side of the boundary contour facing the axis of rotation for attaching the flap disc to a grinding tool. A rotary drive movement can, in particular, be transmitted from the drive of the grinding tool to the flap disc by means of the mounting hub.

[0027] Another embodiment of the invention is preferably characterized in that the edge section is dimensioned such that the abrasive flaps, which are in direct physical contact with the contour of the edge section on the front of the backing plate, project beyond the backing plate by a maximum of 20%, 30%, 40%, or 50% of their radial extension length in a radial direction perpendicular to the axis of rotation. In this way, the supporting effect of the radially outer edge section on the abrasive flaps is further increased. The less the abrasive flaps project beyond the backing plate in the radial direction, the greater the supporting effect.

[0028] Another embodiment is characterized in that the grinding flaps are sickle-shaped flaps or grinding flaps with a rectangular cross-section. The cross-section refers to a top view of the respective grinding flaps and / or to a plane in which the axis of rotation of the backing plate and / or the flap disc extends.

[0029] The crescent-shaped abrasive flaps can have a pointed end circumferentially around the axis of rotation, which is further away from the axis of rotation of the flap disc than the opposite end circumferentially. In particular, the abrasive flaps can be designed as shown in EP 1 142 673 A2. The rectangular abrasive flaps can also be, for example, trapezoidal. Regardless of their shape, the abrasive flaps are arranged overlapping like roof tiles on the backing plate and form a ring of abrasive flaps.

[0030] It is preferred if the material-bonded connection extends in the positive direction by at least 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, or 100% of the extension height of the abrasive flaps extending from the backing plate in the positive direction. In other words, the material-bonded connection, measured from the backing plate, extends in the positive direction by at least 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, or 100%, relative to the extension of the abrasive flaps in the positive direction.

[0031] The problem with regard to the grinding tool is solved by a grinding tool comprising a flap disc according to the invention. The grinding tool is preferably an angle grinder. Regardless of this, it is preferred if the grinding tool has an electric motor drive. The electric motor drive can be supplied with electrical energy by means of an external power source to which the grinding tool can be electrically connected. Alternatively, an internal power source, for example in the form of a rechargeable battery, can be integrated into the grinding tool to supply the electric motor drive with electrical energy. As an alternative to the electric motor drive, it is conceivable to provide a different type of drive. The grinding tool is preferably a grinding tool for grinding wood, stone, and / or metal.The flap disc is preferably detachably connected to the grinding tool, in particular in such a way that after wear of the flap disc, the worn flap disc can be replaced or exchanged with a new flap disc.

[0032] The invention will now be explained in detail using exemplary embodiments and with reference to the drawings. The drawings show:

[0033] Fig. 1 shows an embodiment of the grinding tool according to the invention, Fig. 2 shows an embodiment of a flap disc according to the invention,

[0034] Fig. 3a shows a sectional view AA of the flap disc from Figure 2,

[0035] Fig. 3b shows a sectional view AA of another flap disc according to the invention, and

[0036] Fig. 3b shows a sectional view AA of another flap disc according to the invention.

[0037] Figure 1 shows an embodiment of the grinding tool 15 according to the invention. The grinding tool 15 is an angle grinder comprising an electric motor drive, for example, in the form of a permanent magnet synchronous motor. The electric motor drive is supplied with electrical energy by means of an external electrical energy source 14. Alternatively, the integration of a rechargeable battery into the grinding tool 15 is conceivable. The grinding tool 15 comprises a flap disc 1 according to the invention, which can be driven rotationally by means of the electric motor drive. A workpiece 16, which is made of metal, can be ground using the grinding tool 15 and its flap disc 1. The flap disc 1 is detachably and replaceably connected to the grinding tool 15. This allows worn flap discs 1 to be replaced with new ones.

[0038] Figure 2 shows an embodiment of a flap disc 1 according to the invention. The flap disc 1 is the same as the flap disc 1 from Figure 1, but without the abrasive flaps, so that only the backing plate 2 is shown in a top view. This significantly simplifies the view. On the front face 8a of the backing plate 2 shown in this view, a radially outer edge section 10a of the backing plate 2 is visible, which is bounded radially outside by a circular edge and radially inside the circular edge by a dashed line. Furthermore, the backing plate 2 includes a boundary contour 4, which is indicated by two further dashed lines and extends 360° around a center point 6c. A rotation axis of the backing plate 2 and the flap disc 1 runs through the center point 6c perpendicular to the plane shown here.During operation of the flap disc 1, rotation occurs in the direction of rotation 6b. Of course, rotation in the opposite direction to the depicted rotation 6b is also possible. Furthermore, Figure 2 shows a horizontal cross-sectional view AA through the carrier plate 2.

[0039] Figure 3a shows a sectional view AA, corresponding to the section AA of the flap disc 1 from Figure 2. However, the abrasive flaps 3, which are missing in Figure 2, are shown here. The axis of rotation 6a and a positive direction 7, extending from the rear 8b of the backing plate 2 along the axis of rotation 6a towards the front 8a of the backing plate 2, are visible. The abrasive flaps 3 are attached to the backing plate 2 by means of a material-bonded connection 5 formed by means of an adhesive. To prevent the adhesive from entering an area during the formation of the material-bonded connection 5 where it cannot contribute to the strength of the connection 5, a boundary contour 4 is arranged between the material-bonded connection 5 and the axis of rotation 6a.The boundary contour 4 has a convex shape on its front surface 8a and extends further in the positive direction 7 than the bonded joint 5. In other words, a straight line 12a that intersects the axis of rotation 6a at a point 13 located in the positive direction 7 relative to the carrier plate 2 or the boundary contour 4, and which also intersects or penetrates the bonded joint 5, i.e., is directed towards it, would also have to intersect the boundary contour 4. In other words, the bonded joint is completely or partially obscured by the boundary contour from the perspective of point 13. In this way, the boundary contour 4 forms a barrier for the adhesive of the bonded joint 5, preventing the adhesive from flowing in the direction of the axis of rotation 6a during the formation of the bonded joint.This ensures that the adhesive is used extremely efficiently to form the material-bonded connection 5. This creates a particularly strong material-bonded connection 5 while simultaneously reducing the amount of adhesive required. Furthermore, the flap disc 1 has a mounting hub 11 for connecting to the grinding tool shown in Figure 1. The radially outer edge section 10a is dimensioned such that the abrasive flaps 3, which are in direct physical contact with the contour of the edge section 10a on the front 8a of the backing plate 2, extend beyond the radial outer edge of the backing plate 2 by a maximum of 20% to 30% of their radial extension in a radial direction perpendicular to the axis of rotation 6a.In other words, the length 10b over which the grinding flaps extend along the radially outer edge section is greater than the length 9b of the overhang section 9a, by which the grinding flaps 3 project radially beyond the radial outer edge of the carrier plate 2. Thus, during grinding, the radially outer edge section 10a acts as a support for the grinding flaps 3 and contributes to their stability during the grinding process.

[0040] Figure 3b shows a sectional view AA, corresponding to the section AA of the flap disc 1 from Figure 2, but for a further embodiment of the flap disc 1. The flap disc 1 shown here differs from the flap disc shown in Figure 3a in that the carrier plate 2 shown here is thinner-walled, i.e., has a smaller material thickness. Furthermore, the mounting hub 11 shown here is arranged essentially in one plane with the radially outer edge section 10a. The radially outer edge section 10a has a contour on its front surface 8a that extends along a straight line 12b perpendicular to the axis of rotation. Alternatively, the contour could run at an angle of 0° to 15° to this straight line.In this way, the radially outer edge section 10a acts as a support for the grinding flaps during grinding operation and contributes to their stability during grinding. Furthermore, another difference between the two embodiments is characterized in that the boundary contour 4 of the flap grinding wheel 1 shown here has a shallower rise in the positive direction 7 on the side facing the grinding flaps with decreasing distance to the axis of rotation than in the embodiment of Figure 3a.

[0041] Figure 3c shows a sectional view AA, corresponding to the section AA of the flap disc 1 from Figure 2, but for a further embodiment of the flap disc 1. The flap disc 1 shown here differs from the flap discs in the previous figures by its abrasive flaps 3. While sickle-shaped flaps are shown in the previous figures, these are abrasive flaps 3 with a rectangular cross-section, as seen from a top view of the respective abrasive flap 3 and / or in the illustrated view.

[0042] Furthermore, the material-bonded connection 5 extends at least 20% in the positive direction 7, measured from the carrier plate 2, relative to the extension of the grinding flaps 3 in the positive direction 7. Nevertheless, the boundary contour 4 extends at least as far in the positive direction 7 as the material-bonded connection 5. Moreover, the material-bonded connection extends from the boundary contour to the edge of the carrier plate 2.

[0043] Reference symbol list

[0044] 1 flap disc

[0045] 2 carrier plates

[0046] 3 grinding flaps

[0047] 4. Demarcation contour

[0048] 5. material-bonded connection

[0049] 6 Rotation axis

[0050] 6b Direction of rotation

[0051] 6c Center

[0052] 7 positive direction

[0053] 8a Front

[0054] 8b reverse

[0055] 9a Overpass section

[0056] 9b length

[0057] 10a radial outer edge section

[0058] 10b length

[0059] 11 Mounting hub

[0060] 12a Straight

[0061] 12b Straight

[0062] 13th place

[0063] 14 electrical energy source

[0064] 15 grinding tools

[0065] 16 workpieces

Claims

Claims 1. Flap grinding disc (1) which can be rotated about a rotation axis (6a), wherein the flap grinding disc (1) has a carrier plate (2) and grinding flaps (3) comprising, wherein the carrier plate (2) comprises a front (8a) and a back (8b), and wherein the abrasive flaps (3) are connected to the carrier plate (2) on the front (8a) by means of a material-bonded connection (5), in particular an adhesive connection, characterized in that the carrier plate (2) has a demarcation contour (4) on the front, which is arranged between the axis of rotation (6a) and the material-bonded connection (5), that the demarcation contour (4) extends at least as far in a positive direction as the material-bonded connection (5), and that the positive direction (7) corresponds to a direction from the back (8b) to the front (8a) along the axis of rotation (6a).

2. Flap disc (1 ) according to claim 1 , characterized in that the carrier plate has a constant material thickness along the boundary contour.

3. Flap grinding disc (1) according to claim 1 or 2, characterized in that the boundary contour extends at least further in the positive direction than the grinding flaps extend.

4. Flap disc (1 ) according to one of the preceding claims, characterized in that the material-bonded connection (5) of the abrasive flaps (3) with the carrier plate (2) is formed by a material-bonded connection (5), preferably an adhesive connection, of the abrasive flaps (3) with the boundary contour (4).

5. Flap grinding disc (1 ) according to one of the preceding claims, characterized in that the demarcation contour (4) extends further in the positive direction than the material-bonded connection (5).

6. Flap grinding disc (1 ) according to one of the preceding claims, characterized in that the boundary contour (4) and / or the material-bonded connection (5) extends in the direction of rotation (6b) of the flap grinding disc (1 ).

7. Flap grinding disc (1 ) according to one of the preceding claims, characterized in that the material-bonded connection (5) extends along the boundary contour (4) only on one side of the boundary contour (4) facing away from the axis of rotation (6a).

8. Flap grinding disc (1 ) according to one of the preceding claims, characterized in that the grinding flaps (3) form an overlap area among themselves which faces the boundary contour (4) and extends along the side of the boundary contour (4) which faces away from the axis of rotation (6a).

9. Flap grinding disc (1 ) according to one of the preceding claims, characterized in that the demarcation contour (4) is formed integrally with the carrier plate (2).

10. Flap grinding wheel (1) according to one of the preceding claims, wherein ge- indicates that the boundary contour (4) is convex in the positive direction (7) in a plane in which the axis of rotation (6a) runs.

11. Flap disc (1) according to one of the preceding claims, characterized in that the carrier plate (2) has a radially outer edge section (10a) whose contour on the front side (8a) extends in a plane in which the axis of rotation (6a) is arranged at an angle of 0° to 15° to a straight line (12b) perpendicular to the axis of rotation (6a).

12. Flap disc (1 ) according to claim 11 , characterized in that the carrier plate (2) has at least one connecting section which connects the edge section (10a) with the boundary contour (4 ), that the contour of the at least one connecting section on the front side (8a) of the carrier plate (2) has a larger angle to the line (12b) perpendicular to the axis of rotation (6a) in the plane in which the axis of rotation (6a) is arranged than the contour of the edge section (10a ), and that in particular the carrier plate (2) has a mounting hub (11 ) on the side of the boundary contour (4) facing the axis of rotation (6a) for attaching the flap disc (1 ) to a grinding tool (15 ).

13. Flap grinding disc (1 ) according to claim 11 or 12, characterized in that the edge section is dimensioned such that the grinding flaps (3) which are in direct physical contact with the contour of the edge section (10a) on the front (8a) of the carrier plate (2) extend beyond the carrier plate (2) by a maximum of 20%, 30%, 40% or 50% of their radial extension length in a radial direction perpendicular to the axis of rotation (6a).

14. Grinding tool (15) comprising a flap grinding wheel (1 ) according to one of the preceding claims.

Images