Lamellar grinding tool and method for producing same

Abstract

The present invention relates to a lamellar grinding tool (1), a method for producing the lamellar grinding tool (1) and a material machining method using the lamellar grinding tool. A shaft (4) of the lamellar grinding tool rotates about an axis of rotation. The lamellar grinding tool (1) has a plurality of grinding flaps (2) which extend radially outwardly from at least one securing core. At least two individual grinding flap segments (3, 3', 3'') arranged axially next to each other are interconnected on an inner actuating end (4i) of the shaft (4). On one side, a free drive end (4a) of the shaft (4) projects out of the grinding flap segments (3, 3', 3'').

Description

[0001] Lamellar grinding tool and method for its manufacture

[0002] TECHNICAL FIELD The present invention relates to a flap grinding tool, in particular a fan grinder, wherein the flap grinding tool has a fastening core in which a driving section, preferably a driving section of a shaft of the flap grinding tool arranged along the rotation axis, is embedded.

[0003] STATE OF THE ART

[0004] Flap grinding tools, for example, flap grinding tools designed symmetrically around a rotational axis, are described in DIN 69184 and ISO 5429, for example, and are used for surface finishing on workpieces. The grinding flaps made of a coated abrasive are arranged radially in a fan shape around the axis of the tool. The flaps can be made of abrasive fleece, for example, a textile fleece, and are coated with abrasive grains. The abrasive grains are bonded to the textile fleece using a binder, so that the abrasive grain is usually embedded in a synthetic resin bond on a tensile-strength, flexible fabric backing. Thanks to their flexibility, flap grinding tools adapt to the contours of the workpiece being machined. The resulting advantages of flap grinding tools are used in particular for fine grinding work on large radii in container, kitchen, and apparatus construction.In addition, flap grinding tools are used to remove coarse.

[0005] They are used to remove uneven surfaces, such as weld seams. With the help of flap grinding tools, homogeneous grinding patterns can be achieved on larger surfaces, or contours can be created manually. Another application is fine grinding as a precursor to high-gloss polishing. Flap grinding tools are also suitable for grinding robots and stationary use.

[0006] Depending on the application, different carrier bodies are used for the grinding flaps. For example, plastics, fiber-reinforced plastics, aluminum, or steel are suitable materials for the carrier body. However, a flap grinding tool is particularly easy to manufacture if the connection device of the flap grinding tool to a drive device is a shaft firmly connected to the carrier body. In this case, the carrier body, as a fastening core, is preferably made of a synthetic resin into which the grinding flaps and the shaft are directly embedded.

[0007] Such flap grinding tools and their manufacture are described in US 4 090 333 A, DE 1 986 971 U1, DE 196 31 341 A1 and DE 298 17 664 U1.

[0008] The subject matter of DE 10 2005 022 221 A1 is a flap grinding tool that is designed symmetrically around a rotational axis and has a fastening core with flaps extending radially outward from this core. Preferably, at least some of the flaps consist of a nonwoven fabric with bonded abrasive grains. The nonwoven fabric or another substrate can be bonded or reinforced with a reinforcing material.

[0009] The reinforcing material bonded to the fleece gives the grinding flaps increased stability and thus extends the service life of the tool. A disadvantage of combining the fleece with a reinforcing material is that the flexibility of the flap grinding tool is reduced. Starting from a known flap grinding tool with a rotational axis and at least one central fastening core through which the rotational axis runs and in or on which a driving section, in particular a driving section of an axial shaft is arranged, wherein the flap grinding tool has a plurality of grinding flaps extending radially outwards from the fastening core, improvements are therefore sought.

[0010] SUMMARY AND ADVANTAGES OF THE INVENTION

[0011] The invention relates to a flap grinding tool according to claim 1, a method according to claim 11 and a material processing method according to claim 20.

[0012] Preferred embodiments are specified in the subclaims, the following description and / or the described figures.

[0013] The lamellar grinding tool according to the invention is characterized by a particularly high degree of flexibility, so that an improved adaptation of the grinding tool to its use and / or to a workpiece to be machined is possible.

[0014] The flap grinding tool according to the invention is constructed from at least two individual grinding blade segments. The individual grinding blade segments are connected to one another by means of a driving section, in particular a driving section of the at least one fastening core and / or by means of the shaft.

[0015] The flap grinding tool is preferably designed symmetrically about a rotational axis. A preferred embodiment of the flap grinding tool has a rotationally symmetrical fastening core formed from a cured adhesive. The driving section of a shaft arranged along the rotational axis is then preferably also embedded in the fastening core.

[0016] Preferably, each segment of the flap grinding tool has a plurality of grinding flaps extending radially outwards from the fastening core and can be assembled individually, segment by segment.

[0017] The slats can be attached to the core with an adhesive for a single segment or can be connected across several segments together via a single potting or foaming process to the shaft, through which the common drive takes place.

[0018] A particularly high level of flexibility is achieved when the flap grinding tool is constructed from two individual grinding blade segments and the grinding blade segments are connected to one another via a single hardened core.

[0019] An advantageous grinding blade segment provides a series of individual grinding blades that are fixed together by means of an adhesive strip, whereby the size or length of the grinding blade segment corresponds to the grinding tool to be produced from it.

[0020] If so-called casting sleeves are used in the manufacture of a fan grinder, whereby a grinding blade strip or fan is inserted into the sleeve in a ring shape, the grinding blade segment is preferably selected and / or dimensioned such that the grinding blades fill the sleeve up to their circumferential wall sufficiently evenly and extend radially outwards, whereby a free area or filling space is created in the middle of the casting sleeve in which the driving section of a shaft for the connection to a drive unit is placed. During manufacture of the flap grinding tool this area is cast or foamed with a fastening agent, preferably a synthetic resin. The components are thus connected to one another and, if synthetic resin is used, fixed in place when it hardens.

[0021] The packing density can advantageously be adjusted in the manufacturing method according to the invention to such an extent that penetration of the fastening means between the lamellae can only be detected in a relatively small or minimal radially inner section.

[0022] The packing density can be advantageously set to be particularly high if a lamella stack is formed with a number of lamellas precisely matched to the selected lamellas and the selected fastening means, lamella by lamella individually glued on the later radially inner side.

[0023] A stack inserted into a sleeve that is actually too narrow advantageously results in a pressure that acts radially inwards everywhere, almost in a contact pressure of lamella against lamella.

[0024] An advantageous embodiment of the invention provides that the shaft is a so-called cord pin, which is intended for connecting the flap grinding tool to a drive device, wherein the driving section of the shaft, with which the shaft is embedded in the fastening core, preferably has a knurled and thus enlarged surface. Due to the enlarged surface of the driving section, the integration into the fastening core is improved and withstands the loads and forces acting on the grinding tool, even under extreme grinding conditions.

[0025] A drill or a stationary drive unit is provided as the drive device for the flap grinding tool, particularly for non-stationary use, whereby the shank of the flap grinding tool can be clamped and fixed in the drill chuck, a quick-action clamping device, or another holding device. A particularly advantageous drive device is a drill combined with a flexible drive shaft, which is preferably used as a stationary drive.

[0026] The construction of the flap grinding tool from at least two grinding flame segments not only has the advantage that the tool is particularly flexible and adapts to the workpiece, but it also results in new design possibilities for the tool that cannot be realized with a single grinding flame segment.

[0027] Thus, according to an advantageous embodiment of the present invention, the flap grinding tool is constructed from different grinding blade segments. The grinding blade segments can optionally differ in the abrasive grains used on the grinding blades and / or the abrasive fleece used and / or also generally in the structure of the grinding blades. This results in a multitude of possible variations.

[0028] It is thus possible to carry out different processing steps with a single flap grinding tool because, in the material processing methods made possible by the invention, the different grinding flap segments can be used specifically for the different processing steps without changing the tool.

[0029] An advantageous embodiment of the flap grinding tool provides that an intermediate layer is arranged axially between each of the grinding blade segments, wherein the intermediate layer is preferably integrated into the flap grinding tool together with the grinding blade segments via the hardened core. This intermediate layer is particularly advantageous when working with different grinding blade segments which differ, for example, in the grain size of the abrasive grain used or other properties of the grinding blades. For example, the rough machining of a workpiece can be carried out using a first grinding blade segment which has a coarser grain size.When working with this segment, for example, high stock removal rates are aimed for, so that the surface can then be finished with a second grinding flap segment featuring a finer abrasive grain. The presence of a relatively thin intermediate layer, which preferably does not interfere with the grinding process itself, facilitates such grinding operations for the operator, because they can visually distinguish very precisely between the individual grinding flap segments, even at high working speeds, and use them precisely.

[0030] Preferably, the intermediate layer is a relatively thin disc made of a flexible material which is arranged between two different grinding blade segments and which preferably does not have any grinding properties itself.

[0031] The intermediate layer preferably has an axial thickness or width in a range of 2 to 15 percent, preferably 5 to 10 percent, of the axial width of an adjacent grinding blade segment.

[0032] According to an advantageous embodiment, the intermediate layer is designed in such a way that a noise warns if the tool is used incorrectly. For example, the intermediate layer in this embodiment extends only about half as far outwards as the grinding flaps when at rest. When the grinding mob is in operation, a radial pressure of the rotating mob against a workpiece only ensures removal with optimal grinding quality in the result and also efficiency of the grinding and / or polishing at a certain pressure. If the user presses too hard in this special embodiment, the workpiece touches the intermediate layer, which now extends radially to the workpiece and rotates with it, and depending on the material or condition, this layer begins to sing, for example.

[0033] A preferred embodiment of the intermediate layer provides that the layer differs in color, in particular with a clear color contrast, from the grinding lamella segments, so that the intermediate layer is easily recognizable by the surgeon as the boundary to the next grinding lamella segment during the grinding operation.

[0034] Elastomers, rubber, fabric or fleece are preferably used as materials for the intermediate layer.

[0035] Preferably, the radius of the intermediate layer is smaller, preferably 2 to 50 percent or 5 to 20 percent smaller, than the radius of at least one grinding blade segment, in particular one or both adjacent grinding blade segments, so that the intermediate layer during the grinding operation, in which the grinding blades are brought to the core of the

[0036] The intermediate layer preferably comes into no contact with the workpiece, or at most only minimal contact. The radius is measured from the rotational axis. The grinding operation itself is then not hindered or disturbed by the intermediate layer.

[0037] The present invention further relates to a method for producing a flap grinding tool which is formed symmetrically about an axis of rotation and has a rotationally symmetrical core made from a cured adhesive. The driving section of a shaft arranged along the axis of rotation is embedded in the core. The flap grinding tool has a plurality of grinding flaps which extend radially outwards from the core and are preferably attached to the core by adhesive or cast-in. The flap grinding tool is preferably constructed from at least two individual grinding flap segments which are connected to one another via the cured fastening core.

[0038] The method preferably comprises the steps of: a) punching particularly preferably uniformly sized grinding lamellae, b) fixing the grinding lamellae by means of one or more adhesive tracks, c) uniformly inserting a first grinding lamella segment into a first casting sleeve, wherein the grinding lamellae are radially aligned and a filling space is formed in the center of the casting sleeve, d) inserting a shaft into a filling space arranged in a casting plate, for example a bore, wherein the shaft is inserted into the casting plate with its receiving section which can later be accommodated in a chuck for the drive, so that the driving section of the shaft protrudes from the

[0039] Casting plate protrudes, e) placing the first casting sleeve filled with a first grinding lamella segment onto the casting plate, wherein the shaft with its driving section protrudes centrally into the filling space formed by the first grinding lamella segment, f) uniformly inserting a second

[0040] grinding lamella segment into a second casting sleeve, g) placing the second casting sleeve containing the second grinding lamella segment onto the first casting sleeve, h) tapping the second grinding lamella segment onto the first grinding lamella segment in the first casting sleeve, i) filling the free space between the grinding lamella segments and the driving section of the shaft with resin, j) curing the resin in a heating oven to form a solid core and k) cooling the finished

[0041] Lamellar grinding tool constructed from grinding lamella segments.

[0042] Depending on the number of grinding flap segments to be used to construct the flap grinding tool, steps f), g), and h) are repeated for one or more additional grinding flap segments. In this way, highly flexible flap grinding tools can be produced that can be adapted to the workpiece being machined. Several individual grinding flap segments, preferably narrow relative to the segment radius, are arranged one behind the other on the fixed core of the flap grinding tool.

[0043] According to a further advantageous variant of the method described above, after method step e), an intermediate layer in the form of a thin disc is applied to the first or the respective further grinding lamella segment, wherein the intermediate layer has a preferably central opening, for example, produced by a bore or punching, with a diameter that corresponds to the diameter of the filling space for the fastening core. Such an intermediate layer can further separate different grinding lamella segments in order to be able to carry out the desired grinding operations more precisely.

[0044] A further optimization provides that the potting plate has circular depressions with a receiving space arranged centrally in the circular depression, wherein the diameter of the circular depression corresponds to the diameter of the potting sleeve. The first potting sleeve is inserted with the first grinding blade segment after the shaft has been inserted into the receiving space, preferably designed as a circular depression, and is thus fixed to the potting plate. The further method steps f) to k) are then carried out. In this way, slipping of the potting sleeves on the potting plate can be prevented. This improves process reliability.

[0045] The circular recesses also facilitate the application of a label disc to the flap grinding tool. Before or at the same time as inserting the shaft, a label disc is inserted, with its lettering facing down, into the center of the circular recess of the casting plate. The label disc also has a central hole, the diameter of which corresponds to the diameter of the filling space for the resin core.

[0046] A further advantageous embodiment involves the use of casting sleeves that have an outwardly directed stacking shoulder at their lower end. The stacking shoulder guides the second or subsequent casting sleeve during placement onto the previous casting sleeve and fixes it to the previous casting sleeve. DESCRIPTION OF THE DRAWINGS

[0047] The invention is explained in detail below using examples and with the aid of drawings. These examples are in no way to be seen as limitations. They serve merely to explain the basic principle of the present invention. The same reference symbols are used for the same or similar objects. Objects with different designs but comparable functions often bear the same reference symbol, but with an indication of the variant by an index in the top right next to the reference symbol number.

[0048] It shows :

[0049] Figure 1 is a side view of a flap grinding tool together with the side view of a shaft for the flap grinding tool, wherein in

[0050] Figure la the shaft itself has the driving section, as an integral solid material variant, and in

[0051] Figure 1b shows a multi-part variant, the shaft of which is used as a type of adapter for various lamella segment combinations and the driving section of which is manufactured separately segment by segment and designed to be slipped onto the shaft in a rotationally secure manner,

[0052] Figure 2 is a side view of another flap grinding tool,

[0053] Figure 3 shows a section of a casting plate with a casting sleeve with a shaft and an inserted grinding flame segment inserted into a casting mold, Figure 4 shows a section of a casting plate with a first casting sleeve and a second casting sleeve placed thereon with two inserted grinding flame segments, of which only the uppermost one is visible in the perspective view obliquely from above, and

[0054] Figure 5 is a view from below into a casting sleeve with the insert components grinding lamellae and securing end of the driving section drawn in for better understanding, whereby this view is not actually recognizable in the manufacturing process because the shaft is inserted first into the table, then the casting sleeve or a first of the casting sleeves to be stacked, then the driving section and finally the grinding lamellae of this segment.

[0055] Figure 1a shows a side view of a complete flap grinding tool 1 and, separately, a shank 4 provided for the flap grinding tool 1. In the example explained, the shank 4 consists of a driving section 5 and a receiving section 7, which in the present example each make up approximately half of the shank 4. The receiving section 7 is provided for connecting the flap grinding tool 1 to a drive device. Flexible shafts, straight grinders or grinding blocks can be used as drive devices or drive machines, the drive power for the drive machines usually being between 1000 and 1500 watts. The driving section 5 of the shank 4 serves to integrate the shank 4 in the core of the flap grinding tool 1.In the present example, the driving section 5 has a knurled and thus enlarged surface 6 , which improves the integration into the synthetic resin core of the flap grinding tool 1 .

[0056] The one shown in Figure la, two Schlei flamella segments

[0057] 3, 3' comprises a shaft 4, of which only the receiving section 7 is visible in the selected illustration, while the driving section and the core of the flap grinding tool 1 are concealed by the grinding flaps 2. The selected flap grinding tool 1 comprises two grinding flap segments 3, 3', each of which is made up of a plurality of grinding flaps 2 that are arranged fan-shaped radially around the axis of the flap grinding tool 1, wherein the axis of the flap grinding tool 1 is identical to the shaft 4. The two separate grinding flap segments 3, 3' are arranged directly next to one another on the axis of the flap grinding tool 1 and are only connected to one another via the synthetic resin core of the flap grinding tool 1, which, however, cannot be seen in the selected side view.

[0058] The fastening core, the synthetic resin core described here as an advantageous embodiment, preferably has a rather diffuse circumference or diameter. This is not visible in any figure, but results from the fact that when filling the filling chamber 12, a fastener, selectable as required, penetrates into each radially inner space between the visible grinding lamellae 2.

[0059] The invention enables segment-by-segment fine-tuning in order to meet different requirements in each segment.

[0060] Figure 1b shows an alternative embodiment of the flap grinding tool 1'. A shaft 4' of the flap grinding tool 1', designed as a type of bit adapter, rotates about a rotational axis. Here, too, each grinding flap segment 3' has a plurality of grinding flaps 2' extending radially outward from at least one fastening core. Here, too, at least two individual grinding flap segments 3' arranged axially next to one another are connected to one another on an inner driving end 4i' of the shaft 4', wherein the shaft 4' can penetrate into the driving end 4i'. According to this embodiment, the shaft 4' can be used for various grinding flap segments. Individual grinding flap segments, or a pair or set of three grinding flap segments, can be easily changed. The shaft 4' protrudes on one side from the grinding lamella segments 3' with a free drive end 4a' designed as a bit hexagon.In this case, the driving end 4i' has a central plate 16', schematically indicated in Figure 1a, at a closed head end, for securely receiving the shaft 4' with its central slot formed therein. Alternatively, the driving end can also be hexagonal, and the fastening core can be shaped congruently to the hexagon on the inside, thus ensuring the anti-twist protection.

[0061] The subject of Figure 2 is a lamellar grinding tool 1 '' in side view. The lamellar grinding tool 1'' selected here comprises a total of three grinding lamellar segments 3, 3', 3'', which are arranged on the shaft 4'', of which in this case only the receiving section 7'' is visible. In this case, the grinding lamellar segments 3, 3', 3'' are each separated from one another by a relatively thin intermediate layer 8''. This is particularly advantageous when different grinding lamellar segments 3, 3', 3'' are used, since this makes it easier for the surgeon to use a specific grinding lamellar segment 3, 3', 3''.

[0062] The diameter of the intermediate layer 8 '' is preferably smaller than that of the grinding lamella segment 3, 3', 3'', in particular of both axially adjacent grinding lamella segments 3, 3', 3''. The diameter of the intermediate layer 8'' can, however, also be equal to the diameter of the grinding lamella segments 3, 3 ',

[0063] 3 '' be .

[0064] The grinding lamellae 2 '' arranged in a fan shape radially around the axis are pressed together during the grinding operation so that the intermediate layer 8 '' preferably does not come into contact with the tool surface or only comes into slight contact during grinding.

[0065] The intermediate layer 8 '' is advantageously made of a flexible material, such as rubber, elastomer, fabric or fleece, and preferably has no abrasive properties, so that the workpiece cannot be damaged.

[0066] In an embodiment not shown, the diameter of the intermediate layer 8" can alternatively be selected to be larger than the diameter of the tool, which is otherwise slimmer in the lamella section. This can be advantageous during production if the fastening core is to be attached to the shaft using a different fastening means or a separate fastening core for other reasons.

[0067] According to further preferred embodiments, the intermediate layer 8 '' is completely or partially removable or replaceable after production or for different use.

[0068] The individual disk packs can also have partially or individually different outer and / or inner (core) diameters. The invention thus allows for maximum flexibility.

[0069] The manufacturing process for the described flap grinding tools will be explained with the help of Figures 3 and 4. Figure 3 shows a section of a casting plate 9 which has a large number of circular recesses 10, in the middle of which a receiving space 11 is arranged. The receiving space 11 is provided for receiving the receiving section 7 of the shaft 4, wherein the shaft 4 is inserted into the receiving space 11 far enough that the driving section 5 of the shaft 4 protrudes vertically from the casting plate 9. The diameter of the circular recess 10 is selected such that the casting sleeve 13 can be placed precisely in the recess 10 on the casting plate 9, which is shown in the middle of the section shown, where a casting sleeve 13 with an inserted grinding flap segment 3 can be seen.The shaft 4 can also be seen, which projects vertically from the casting plate 9 and is arranged in the filling space 12 which is formed in the middle of the casting sleeve 13 by the inserted grinding blade segment 3, 3'. The filling space 12 is formed because the depth of the grinding blade segment 3, 3', which lies radially against the inner wall of the casting sleeve 13, is smaller than the radius of the casting sleeve 13. In Figure 3, the method steps a) to e) from the description are thus summarized and reproduced.

[0070] Figure 4 shows the result of method steps f) to h) using the same section of the potting plate 9 from Figure 3, although in this case a second potting sleeve 13 with an inserted second grinding flame segment 3' is placed on the first potting sleeve 13. In this illustration, only the filling space 12 can be seen, which is formed by the inserted grinding flame segment 3'. The driving section 5 of the shaft 4, which is arranged in the lower region of the filling space 12, does not protrude far enough from the plane of the potting plate 9 to be visible from the selected perspective. In the following process steps i) to k), the filling chamber 12 is filled with synthetic resin, the casting plate 9 is pushed into a heating furnace to harden the synthetic resin and then the resulting flap grinding tool 1 is placed outside the

[0071] Heating furnace cooled. Figure 5 shows a schematic, perspective view obliquely from below 17 ' into a casting sleeve with grinding fins drawn in for better understanding. A securing end 15 ' of a driving section 5 ' can be seen centrally. In deviation from the illustration in Figure 1b, the shaft 4 ' must have laterally positively projecting securing elements facing the hexagonal drive end, which penetrate into the slots as anti-twist device 16 ' of the securing end 15 ' according to Figure 5. This view in Figure 5 is not actually visible in the production process because the shaft 4 ' is inserted into the table with its drive end first. Then the casting sleeve or a first of the casting sleeves to be stacked is inserted into a suitable table recess according to Figure 4. The driving section 5 ' is pushed onto the shaft protruding centrally from the casting sleeve.Finally, the grinding blades of this segment are inserted into the casting sleeve so as to be distributed around the driving section 5'. The grinding blades rest with their lower edges 19 on the casting plate 9, as does the casting sleeve with its underside 17'. The filling space 12' for adhesive resin is formed between the outer wall 23' of the driving section 5' and the inner edges 20 of the grinding blades. The shaft and the inner wall 22' of the driving section 5' are sufficiently sealed against one another so that no adhesive can penetrate between them.

[0072] LIST OF REFERENCE SYMBOLS

[0073] 1 flap grinding tool (fan grinder)

[0074] 1' flap grinding tool (fan grinder)

[0075] 2 grinding lamellas

[0076] 2 ' grinding lamellas

[0077] 3 grinding flap segments

[0078] 3' grinding flap segment

[0079] 3'' grinding flap segment

[0080] 4 shaft (cord pin)

[0081] 4 ' shaft

[0082] 5 Takeaway section

[0083] 5 ' takeaway section

[0084] 6 Knurled surface

[0085] 6' Knurled surface

[0086] 7 Mounting section (for the drive)

[0087] 7' receiving section (for the drive)

[0088] 8 Intermediate layer

[0089] 8 ' intermediate layer

[0090] 9 Casting plate (mold table plate)

[0091] 10 circular recess

[0092] 11 Recording room

[0093] 12 filling chamber

[0094] 13 sleeve

[0095] 15' securing end

[0096] 16 Anti-twist device

[0097] 16' central plate

[0098] 17 Subpage

[0099] 18 Top

[0100] 19 bottom edge

[0101] 20 inner edge

[0102] 21 Outer edge

[0103] 22 ' interior wall

[0104] 23' exterior wall

Claims

Patents 1. Lamellar grinding tool (1) with an axial shaft (4) through which a rotational axis runs, and with at least one central fastening core through which the rotational axis also runs and in or on which a driving section (5), in particular the driving section (5) of the shaft (4), is arranged or which comprises such a driving section (5), wherein the lamellar grinding tool (1) has a plurality of grinding flaps (2) extending radially outwards from the fastening core, in particular from the driving section (5), wherein the lamellar grinding tool (1) has at least two individual grinding flap segments (3, 3', 3'') arranged axially next to one another with radially outwards extending grinding flaps (2), and wherein the individual grinding flap segments (3, 3',3' ') on an inner driving end (4i) of the shaft (4) are connected to each other by means of the driving section (5) and the shaft (4) protrudes on one side with a free drive end (4a) from the grinding flap segments., 2. Lamellar grinding tool (1) according to claim 1, wherein the lamellar grinding tool (1) is constructed from at least two or three different grinding lamella segments (3, 3', 3''), wherein the grinding lamella segments (3, 3', 3'') differ: (a) by an abrasive grain used for the respective abrasive lamella segment (3, 3', 3'') and / or its bonding material; and / or (b) by a backing or abrasive fleece or abrasive felt used for the respective abrasive lamella segment (3, 3', 3''); and / or (c) by the structure of the respective grinding lamella segment (3, 3', 3''), in particular by the material of a fastening core section associated with the respective grinding lamella segment (3, 3', 3''); and / or (d) by the angle at which the grinding lamellae are connected to the driving section (5) in an internally aligned manner to the axis of rotation, particularly preferably in the case of two segments with opposite angles, so that in the radial side view of the free lamella ends the lamella ends enclose an obtuse angle.

3. Lamellar grinding tool according to one of claims 1 or 2, wherein a radially extending intermediate layer (8) is arranged at least between two or three of the grinding lamellar segments (3, 3', 3'') arranged axially next to one another, wherein the intermediate layer (8) is preferably integrated into or fastened to the lamellar grinding tool (1) together with the grinding lamellar segments (3, 3', 3'') by means of the fastening core or the driving section (5).

4. Lamellar grinding tool according to one of the preceding claims, characterized in that the grinding lamellae are glued or cast radially inwardly over their entire axial length with the driving section, preferably with one driving section each.

5. Lamellar grinding tool according to claim 3, wherein the intermediate layer (8) is preferably reversibly fastened to the fastening core, to the driving section (5) and / or to the shaft (4).

6. Lamellar grinding tool according to at least one of the preceding claims, wherein the driving section (5) has a knurled surface (6).

7. Lamellar grinding tool according to at least one of the preceding claims, wherein (a) the intermediate layer (8) has a smaller outer diameter than the grinding lamellae (1) of at least one of its axially adjacent grinding lamella segments (3, 3', 3''); and / or wherein (b) the intermediate layer (8) consists of a sealing material or has a sealing surface on one or both sides axially surrounding the axis of rotation and extending radially from the fastening core or the driving section (5) to the outer diameter of the intermediate layer (8); and / or wherein (c) the intermediate layer (8) is designed to be pushed onto the shaft (4) or the driving section (5) in a sealing manner relative to the shaft (4) or the driving section (5).

8. Lamellar grinding tool according to at least one of the preceding claims, wherein the intermediate layer (8) is a flexible disc, in particular a relatively thin flexible disc, which is arranged axially between grinding lamellar segments (3, 3', 3'').

9. Lamellar grinding tool according to at least one of the preceding claims, wherein the material of the intermediate layer (8) is a paper, a relatively strong plastic, an elastomer, rubber, a fabric, a felt and / or a fleece.

10. Lamellar grinding tool according to at least one of the preceding claims, wherein at least two or three of the grinding lamella segments (3, 3', 3'') arranged axially next to one another are arranged at a distance from one another.

11. A method for producing a grinding tool (1) with a central fastening core and grinding lamellae (2) ending freely radially outwards, the method comprising at least the steps: (a) introducing, in particular adjusting, a plurality of grinding lamellae (2) to form a first grinding lamella segment (3, 3', 3'') into a first sleeve (13), wherein the grinding lamellae (2) are introduced or aligned at least roughly radially around at least one filling space (12) formed radially inward, so that the grinding lamellae (2) abut one another with, in particular, relatively short edge sections radially inward, forming the circumference of the filling space; (b) introducing a driving section (5) into the at least one filling space (12) or into a plurality of axially adjacent filling spaces (12); (c) introducing grinding lamellae (2) of a second grinding lamella segment (3, 3', 3'') into the first sleeve (13) or into a further sleeve (13); (d) filling the filling space (12) formed in the first sleeve (13) or the filling spaces (12) formed in the first and the further sleeve (13) with at least one Fasteners .

12. The method according to claim 11, wherein the central fastening core is connected to at least one shaft (4) or has a shaft (4) and / or wherein the driving section (5) is part of the shaft (4) or is formed as part of the shaft (4), and wherein a receiving section (7) of the shaft (4) is arranged as a free central drive end outside the at least one filling space (12).

13. The method according to claim 11 or 12, wherein a segmented flap grinding tool (1) is produced according to at least one of claims 1 to 9.

14. Method according to at least one of claims 11 to 13, wherein for each grinding lamella segment (3, 3', 3'') a sleeve (13) completely filled with grinding lamellas (2) is Shell towers are stacked on top of each other to preferably prepare a single common filling process.

15. Method according to at least one of claims 11 to 14, wherein before the introduction of the grinding lamellae (2) into the sleeve (13) the grinding lamellae (2) are stacked, wherein in the respective area of ​​the adjacent, in particular radially relatively short edge sections, an auxiliary means is applied as a track on the grinding lamella (2) stacked next, until a stack height corresponding to the later circumference of the filling space (12) is reached.

16. Method according to at least one of claims 11 to 15, wherein an intermediate layer (8) extending in the radial direction is arranged at least between two grinding lamella segments (3, 3', 3''), and wherein the intermediate layer (8) is preferably inserted with a central opening aligned coaxially with the diameter of the filling space (12).

17. Method according to at least one of claims 11 to 16, wherein the filling space of several lamella segments is poured or foamed in a single filling process, or wherein the filling is carried out segment by segment.

18. Method according to at least one of claims 11 to 17, wherein a casting plate (9) has circular recesses (10) for receiving the sleeve (13), each with a receiving space (11) arranged centrally in the circular recess (10), wherein the diameter of the circular recess (10) corresponds to the diameter of the casting sleeve (13), so that at least the first casting sleeve (13) with the first grinding lamella segment (3, 3', 3'') after the shaft (4) has been inserted into the receiving space (11) in the circular recess (10) inserted and thus fixed to the casting plate (9).

19. The method according to claim 18, characterized in that the casting plate (9) is mounted rotatably about an axis parallel to the axis of rotation.

20. Material processing method with a Lamellar grinding tool according to one of claims 1 to 10.

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