Dressing tool with solid elements in tracks

Abstract

A dressing tool comprising a base body and one or more dressing surfaces or one or more dressing edges, wherein the dressing surfaces or edges are provided with hard material elements, and wherein grooves are provided, with a plurality of hard material elements being soldered into each groove. The invention also relates to a dressing tool in which recesses are arranged in a regular pattern and a single hard material element is soldered into each recess.

Description

[0001] Dressing tools are known from the prior art in which diamonds scattered using a galvanic process are fixed to a base body using electroplated nickel. Depending on the diamond grain size, different densities of diamonds are formed on the surface. The arrangement of the diamonds results from the scattering of the diamond grains, which lie adjacent to one another during scattering on the surface of the base body.

[0002] Furthermore, from DE 29819006 U1 a diamond dressing wheel is known in which diamonds are inserted in essentially radial grooves in the area of ​​the front side of the dressing wheel.

[0003] Furthermore, WO 91 / 10538 A1, which forms the basis of the preamble of claims 1 and 13, shows a composite material comprising a carrier with a cellular structure and diamonds or other particles within this structure.

[0004] US 6 193 770 B1 describes a diamond tool in which diamonds are chemically bonded using a solder comprising Cr, Mn, SI or Al or mixtures or alloys thereof.

[0005] Furthermore, DE 10 2013 107 266 A1 describes a dressing tool and a method for producing the same. The dressing tool comprises a base section and an extension piece extending therefrom, having at least one brazing area to which grinding particles are connected via a brazed metal connection. To achieve a structurally simple design, it is proposed that the grinding particles be fixed in a carrier containing the grinding particles and be connected to the at least one brazing area of ​​the extension piece by brazing.

[0006] WO 2008 / 101263 A1 shows a dressing tool for surface treatment comprising a base body with one or more dressing surfaces which are at least partially covered with superhard materials and has a series of edge protection elements which are fitted into recesses which are adapted to the shape of the edge protection elements.

[0007] WO 2017 / 042395 A1 further discloses a dressing tool in which hard grains are bonded in a layer and, in addition, integral platelets or rod-shaped dressing elements made of a hard material are distributed throughout the layer and bonded to the carrier. The object of the present invention is to create a dressing tool in which a dressing surface or dressing edge is created using a plurality of diamonds, so that the dressing density can be adjusted in a controlled manner. The creation of a controlled chip space may also be desired.

[0008] The problem is solved with a dressing tool according to claim 1 and claim 13.

[0009] Exemplary embodiments are given in the subclaims.

[0010] The hard material elements can be diamonds or consist of or comprise cubic boron nitride (CBN). In the following description, reference is only made to diamonds as an example, but CBN elements can also be used instead of diamonds. In principle, all references to diamonds in the following description are to be understood as examples. Alternatively, all other hard material elements mentioned below as examples can also be used. The materials from which the hard material elements consist or comprise also include MCD, CVD, PKD (polycrystalline diamonds), as well as in particular natural diamonds and in particular synthetic diamonds. Cubic boron carbon nitride (cBC2N) can also be used as a material.

[0011] To secure a plurality of diamonds, grooves are provided in a (metallic) base body of the dressing tool, and a plurality of diamonds are soldered into each of these grooves using a solder. By specifying appropriate grooves, the diamond loading density can be controlled and, at the same time, the surface or shape suitable for soldering can be created. A plurality of diamonds are arranged in each track, thus providing the greatest possible flexibility with regard to the shape of the grooves. Furthermore, a groove can be sufficiently filled with diamonds.

[0012] The base body itself can consist of or comprise a metallic material, such as steel. In some embodiments, the base body can also consist of or comprise a non-rusting material, such as stainless steel. The base body can also be manufactured from a "blank" of any shape using a machining process. Machining processes are all processes in which the body to be manufactured is produced from a "blank" by removing "excess" material. The excess material is thus mechanically removed from the blank—in the form of chips—until the body to be manufactured is obtained.

[0013] The grooves can also be formed in the base body using a machining process. This can be done either simultaneously with the forming of the base body using a machining process or after the base body has been manufactured. With regard to the machining process (see above), the base body without grooves represents the "blank," while the base body with grooves represents the body to be manufactured.

[0014] The grooves are significantly longer than their width. This creates tracks in which diamonds can be conveniently arranged to fill a surface, while simultaneously allowing the diamond density to be controlled. For example, the length of the groove can be more than 10, 20, or 30 times the width of the groove.

[0015] Between the diamonds in the grooves it is possible to create a chip space in which removed material can be removed during a dressing process.

[0016] Especially with dressing tools where diamonds are fixed to a base body using a galvanic or sintering process, it can happen that no chip space is available when using a dressing tool and the dressing tool can therefore only work with a high contact pressure.

[0017] The grooves are formed, for example, by a recess in a dressing surface or in a side surface located next to a dressing edge. Diamonds and the solder can fill the grooves or protrude from them. In a cross-section of the groove, the cross-section can also be completely filled with diamonds and solder at some or all points of the groove.

[0018] To create a dressing surface, it is advantageous if the grooves on the dressing surface run spirally from the inside to the outside. This makes it possible to create the same filler density on an inner and a more outer part of the dressing surface.

[0019] For example, the diamond density from the inside to the outside in an area of ​​the dressing surface is constant in at least part of the dressing surface.

[0020] The grooves can, for example, also run radially outward and end in a dressing edge (radial when viewed along the central axis or a central opening of the dressing tool). In the dressing edge, diamonds are provided at the dressing edge by the grooves in which the diamonds are arranged. For this purpose, the diamonds can be held in grooves arranged in a side surface provided to the side of a dressing edge. This allows a functional dressing edge to continue to be created even when the dressing tool wears and its circumference decreases.

[0021] For radially outward-running grooves, a plurality of diamonds is provided, for example, at least 10 or 20 diamonds. For spirally outward-running grooves that form a dressing surface, at least 40, 75, or at least 100 diamonds or even more are provided to achieve a uniform dressing effect across the entire surface.

[0022] The dressing tool can, for example, have one or exactly two dressing surfaces, wherein the two dressing surfaces are provided on opposite side surfaces of a base body.

[0023] Furthermore, edge protection can be provided, for example, in the circumference area of ​​a dressing tool, which is provided, for example, by additional diamonds or CBN elements in the area of ​​the peripheral edge or a peripheral surface. The areas of a dressing tool that would wear first can thus be reinforced, thus achieving a longer tool service life. The following section focuses on edge protection with diamonds, but CBN elements can also be used for edge protection instead of diamonds.

[0024] The diamonds (or, as already mentioned, alternatively the CBN elements) of the edge protection can be present in various geometries, such as rods, discs, plates or as shapes cut from plates (shaped plates).

[0025] In principle, embodiments in which the diamonds are present as shaped plates are preferred. Shaped plates on hard material are usually elements cut from a larger material plate (for example, using a laser). These shaped plates can, but do not have to, be rod-shaped or plate-shaped. Shaped plates are also used synonymously below for "hard materials" and "hard material elements," as well as "diamonds." The shaped plates are not initially restricted in terms of their shape. As described above, shapes such as plates, rods, discs, and the like can be realized. The thickness of the material plate is usually significantly smaller than the other dimensions of the material plate, and when cutting the shaped plates, the cut is made in the direction of the thickness of the material plate (i.e., through the material plate). Typically, the thickness of the material plate from which the shaped plates are cut is no more than 0.1 mm.Material sheets with a thickness of no more than 2 mm, preferably no more than 1 mm, can also be used. The molded sheets cut from such material sheets will then have an extension corresponding to the thickness of the material sheet, at least in one direction.

[0026] The diamonds of the edge protection, for example, are plate-shaped diamonds that are soldered into grooves around the circumference. Soldering diamonds into grooves around the circumference enables the diamonds to be held particularly well and securely in the grooves, as large surfaces are available with which the diamonds can be connected to the inside of the grooves. The diamonds and the solder, for example, completely fill the grooves. The diamonds are connected to at least two opposite sides of the groove. Two opposite sides of the diamond are also connected to the groove. The diamonds can also be connected to three sides of a groove using solder, with one side lying between two opposite sides. The solder for the connection is in direct contact with the surface of a corresponding side of a groove.

[0027] In one embodiment, the mold plates made of hard material (diamonds, CBN, etc.) have (exactly) two opposite flat surfaces as their largest outer surfaces, which generally run parallel to each other. The mold plates can have a rectangular shape (when viewed from one of the two largest outer surfaces) due to the remaining boundary surfaces located between the two largest outer surfaces. The mold plates or diamonds with such an external geometry can be described as "plate-shaped" or having a plate shape. The mold plates can be considered "rod-shaped" if the extension of a mold plate in one spatial direction is significantly larger, for example, at least twice as large as the extension in the two remaining spatial directions. This can be considered an elongated cuboid with side lengths a, b, c, where one of the side lengths, for example, a, is significantly longer than the side lengths b, c.However, the mold plates can also be trapezoidal. They can also be semicircular or triangular. Such a mold plate can also have a rectangular or square base shape, followed by a trapezoid, a semicircle, or a triangle. This gives the mold plate or the hard material element a different external shape depending on the application.

[0028] For edge protection, diamond (or CBN) rods can also be used, which are inserted into corresponding holes or grooves in the area of ​​the peripheral edge or the peripheral surface.

[0029] The diamonds in the grooves are, for example, diamond chips or grain-shaped diamonds. Such diamonds can be easily arranged in irregularly shaped grooves and allow for the creation of a controlled diamond density. Grain-shaped diamonds can be, for example, octahedrons, dodecahedra, icosahedrons, or irregularly shaped grains. These shapes either arise during the manufacturing process of the hard materials or, depending on the requirements, can be subsequently created by grinding in the case of natural diamonds or synthetic hard materials.

[0030] The diamonds can be MCD, CVD, or PCD (polycrystalline diamonds), or diamond chips. They can also be cut or uncut natural diamonds. Likewise, as mentioned above, boron nitride (CBN) elements or chips thereof can be used instead of diamonds.

[0031] The solder used can be a soft solder or a hard solder, for example. The solder can be used to attach the diamonds using a soldering process such as vacuum soldering, inert gas soldering, or similar. The solder can be a nickel-containing solder containing at least 38 percent nickel by weight, as well as other metals that lower the melting point compared to nickel.

[0032] Examples of embodiments are illustrated in the accompanying figures. Herein: Fig. 1 a front view of a dressing tool; Fig. 2 a side view of a dressing tool; Fig. 3 a sectional view of a dressing tool in the area of ​​its circumference; Fig. 4 a schematic representation of the arrangement of diamonds in grooves; Fig. 5 a schematic representation of spiral grooves; Fig. 6 an enlargement of the peripheral edge with edge protection elements; Fig. 7, Fig. 8 a further embodiment of a dressing tool with a dressing edge; Fig. 9 a further embodiment of the invention.

[0033] Fig. 1 shows a dressing tool 2 with two dressing surfaces 2 and 3. The dressing surfaces 2 and 3 are conical in shape, so that in the front view of Fig. 1have a straight line in the radial direction on the surface toward the circumference. However, instead of the straight line in the radial direction on the surface toward the circumference, a (slightly) concave or convex shape can also be provided, for example, to dress correspondingly shaped grinding tools.

[0034] An opening 6 is provided centrally in the dressing tool 1, which serves to secure the dressing tool to a rotating drive. Additional holes may also be provided next to the opening for this purpose. The dressing surfaces 2 and 3 are arranged around a central part 5 that encloses or forms the opening 6.

[0035] The dressing surfaces 2 and 3 are separated by a dressing edge 4, which runs along the circumference of the dressing tool 2. The dressing surfaces 2 and 3 are arranged on opposite sides of the dressing tool 2.

[0036] However, two or more dressing surfaces can be provided on the same side of a dressing tool, provided the tool has a corresponding shape. Only one dressing surface (in particular, located on one side of the dressing tool 2) can also be provided, depending on the desired use of the dressing tool.

[0037] The base body 1 is usually formed by a metallic base body. In this metallic base body, as shown in Fig. 3 As can be seen, grooves 7 are machined. These grooves are provided in the area of ​​the dressing surfaces 2 and 3. The grooves 7 have a rectangular cross-section (as in Fig. 3 shown). However, they can also have a triangular, semicircular, or rounded cross-section.

[0038] As in Fig. 4a ), diamond grains or diamond chips 8 are held in the grooves 7 by means of a solder 9.

[0039] It should be expressly pointed out again at this point that fundamental hard material elements can be used in all embodiments described here. Of these hard material elements, diamond, in particular diamond chips and diamond grains, as mentioned in the previous paragraph, is only an example and should not be understood as limiting. Instead of the diamond grains or chips 8, any other hard material elements, such as CNB elements, MCD, CVD, PCD (polycrystalline diamond), as well as in particular natural diamonds and in particular synthetic diamonds, can be used. Furthermore, cubic boron carbon nitride (cBC2N) can be used as a material.

[0040] The grooves 7 are in cross section (see Fig. 4a)) completely filled with diamond and solder. Some of the diamond grains or diamond chips 8 protrude from the grooves 7 and are thus available for a dressing process. A chip space 12 is formed between two grooves and the corresponding diamonds 8 protruding from the grooves. Because the diamonds are held in the area of ​​the grooves 7, the chip space 12 can be adjusted as desired by configuring the grooves and their spacing.

[0041] It can be provided that all diamonds protrude from their groove or only some (50% or less). It can also be that at least 90% or at least 50% of the diamonds protrude from their groove. Whether the diamonds protrude from their groove or not can be adjusted by the grain size and the depth of the groove. According to the invention, the grooves have a depth of less than half the average grain size used for the hard material elements. This leaves the diamonds largely exposed and can wear away with a large portion of their volume while still being available for a dressing process.

[0042] In Fig. 4b It is shown how in a cross-section transverse to the extent of the groove only one diamond is arranged individually. However, along the groove, a plurality of such diamonds are provided (individually in the cross-section). Fig. 4cSeveral diamonds are arranged next to each other in the cross-section. Along the groove there will be a large number of groups of such diamonds. Fig. 4b and Fig. 4c All of the diamonds protrude from the groove. However, only a portion, such as 90% or 50%, may protrude from the groove.

[0043] In Fig. 4d shows how diamonds can lie on top of each other in a groove in cross-section. One diamond is completely sunk into the groove and another diamond partially protrudes from the groove. Fig. 4b and 4c diamonds do not lie on top of each other. In Fig. 4a The variant shown is one in which diamonds are arranged both on top of each other and next to each other in cross-section. Some of the diamonds (e.g., between 30% and 70%) protrude from the groove, others do not.

[0044] The diamond density, i.e., the number of diamonds available per unit area for a dressing process, can also be freely selected over a wide range by varying the width of the grooves 7 and the spacing of the grooves 7. This represents a major advantage over the electroplating process, in which the diamonds are fixed to a base body from a scattering and have a diamond density determined by the grain size.

[0045] The grooves 7 can have a depth that is smaller than the width of the grooves. However, they can also have a depth of less than half the width of the grooves.

[0046] The grooves can be spaced apart at a distance equal to or greater than the respective width of the two grooves at a given location. However, the spacing can also be greater than twice or three times the respective width of the grooves at the respective locations of the two grooves between which the spacing is determined. This reduces the chip density but increases the chip space between the grooves.

[0047] The areas between the grooves can also be smaller than the width of the grooves, resulting in a relatively high diamond density.

[0048] In Fig. 5 an advantageous embodiment is shown with regard to the geometry of the grooves 7, which, as in Fig. 5shown, extend spirally outwards. The distance 11 between two grooves at an inner end of the dressing surface 3 is the same as the distance 11 at an outer end of the dressing surface 3. To achieve this, the grooves are designed so that they are arranged curvilinearly on the dressing surface 3 in a side view. The distance 11 is measured here transversely to the respective groove. The grooves 7 therefore run, for example, spirally from the central part 5 to the peripheral edge 4.

[0049] Furthermore, with the spiral geometry it is possible to make the setting density, which results for example in the area 10a and in the area 10b, the same, ie that an equal number of diamonds is provided in the respective surfaces 10a and 10b, wherein the surfaces 10a and 10b have the same size and, however, the surface 10a is arranged radially further inwards than the surface 10b.

[0050] In Fig. 6a variant of a dressing tool is shown in more detail, in which edge reinforcements 15 are also provided in the peripheral edge 4. The edge reinforcements 15 are provided in grooves arranged in the region of the peripheral edge 4. The edge reinforcements 15 are formed by diamonds, preferably in the form of the shaped plates described above in plate form or in rod form. The grooves are, for example, radially aligned and extend, particularly in a dressing tool with two dressing surfaces on opposite sides of the dressing tool separated from one another by the peripheral edge, from one side surface (dressing surface 3) through the base body to the opposite side surface (here dressing surface 2).

[0051] As an alternative to the grooves for attaching the edge reinforcements 15, particularly in the case of dressing tools that have one or more dressing surfaces on only one side, pockets can also be arranged on the side of the dressing tool provided with a dressing surface, in which the edge reinforcements 15 are provided. These pockets do not extend completely from one side surface to the other side surface of the base body, which are separated by the peripheral edge. Rather, the pockets are recesses on only one side and, if necessary, along the peripheral edge 4.

[0052] Such a pocket can have a constant depth (measured perpendicular to a surface defined by the side face of the dressing tool) of, for example, 1 mm, 2 mm, or 3 mm, or it can have a varying depth. For example, the pocket can be deeper toward the center of the dressing tool than directly at the peripheral edge. In the following, the term "grooves" in connection with edge reinforcements is used synonymously for the grooves and the pockets in which the edge reinforcements may be provided.

[0053] The edge reinforcements 15 are also fixed in the grooves with solder. The edge reinforcements 15 are connected, for example, to at least two opposite sides of a groove.

[0054] The grooves (or pockets) of the edge reinforcements have a depth (measured from the peripheral edge toward the center of the dressing tool) 17 that can be 0.5 mm to 10 mm, or 3 mm to 10 mm. The distance 16 between two grooves, each with an edge reinforcement, measured on the outside of the circumference, can be 0.5 mm to 10 mm.

[0055] The edge reinforcements can also be made of other hard materials such as CBN. The edge reinforcements can also be formed from rods, discs, or shapes cut from plates. Embodiments of the diamonds in the form of the described shaped plates are preferred here. These can, as described above, be particularly plate-shaped or rod-shaped. These edge reinforcements are inserted into the (metallic) base body in the region of the peripheral edge or the peripheral surface and held there, for example by soldering. For this purpose, grooves, bores, slots, or similar features can be provided in the (metallic) base body in the region of the peripheral edge or the peripheral surface.

[0056] However, the edge reinforcements 15 are optional and can also be used with the tools as in Fig. 1, 2 and 3 shown are omitted.

[0057] Fig. 7 and Fig. 8shows an embodiment of the invention in which the grooves 25 are arranged in a radial direction and end in a dressing edge 21. The grooves 25 are provided in a side surface 24 of the dressing tool, which adjoins the dressing edge 21. The dressing tool 20 also has a metallic base body in which an opening 22 is provided for receiving the dressing tool 20 on a rotating drive. The dressing tool 20 can have a recess 23 on a side on which the dressing edge 21 is provided, so that the dressing edge 21 can be brought laterally very close to an object or article to be dressed.

[0058] Instead of a radial alignment of the grooves up to the dressing edge, the grooves can also run obliquely to the radial direction toward the dressing edge. For example, the grooves can have an angle of up to 30° or 45° with a radial direction when viewed along the opening 22 (or along the central axis).

[0059] The Fig. 8 The grooves 25 shown extend radially to the edge 21 (or they extend obliquely to the radial direction; not shown). The grooves 25 are formed in a metallic material of the base body. The spacing of the grooves 25 and the width of the grooves 25 can define the diamond loading density along the dressing edge 21. The arrangement of the diamonds in the grooves allows work to continue even when the dressing tool wears, with the dressing edge 21 shifting radially inward, until the area of ​​the grooves 25 is completely used up.

[0060] The grooves 25 can, as in Fig. 8 shown, have a rectangular cross-section. However, they can also have a triangular, semicircular, or rounded cross-section.

[0061] The diamonds can be used in these grooves as in Fig. 4 shown and described there.

[0062] For straight grooves, it is also conceivable to arrange rod- or plate-shaped diamonds, or, as mentioned above, CBN elements, in them. Shapes cut from larger plates can also be inserted into the grooves. Diamond designs as shaped plates are preferred in this case.

[0063] Furthermore, the grooves can be Fig. 8As shown, the grooves can have a greater width or even the same width as the areas between the grooves that space them apart. This results in a very high, yet controlled, diamond setting density. The areas between the grooves can also be even smaller than the width of the grooves, resulting in an even higher setting density.

[0064] In the Figures 9a to 9cA further embodiment of the invention is shown. The dressing tool 30 has a dressing surface 31 formed by individual diamonds 38 spaced apart from one another. According to the invention, the diamonds 38 are each soldered into an individual recess 32. The solder 39 therefor and the diamond 38 completely fill the recess 32. However, the solder 39 also extends beyond the recess 32 and also covers part of the surface of the metallic base body adjacent to the recess 32. The solder 39 also covers part of the surface of the diamonds 38.

[0065] On the Figure 9a A further dressing surface can be provided on the rear side of the dressing tool 30. This is provided on the opposite side of the dressing tool 30 from the aforementioned dressing surface 31. These two dressing surfaces are separated from each other by a peripheral edge 35.

[0066] As in Figures 9a and 9bAs can be seen particularly well, the depressions 32 are arranged on tracks 34, which in turn have a spiral course from the inside to the outside. The spiral course of the tracks results in a constant density of diamonds 38 on the dressing surface 31. Neighboring tracks 34 can, for example, have a constant distance along their track. In a spiral track 34, for example, at least 10, 15 or 20 or even more depressions 32, each with a diamond 38, are provided. The depressions are as in Figures 9a and 9b arranged in a regular pattern. However, other regular patterns than the one in Figures 9a and 9b shown possible.

[0067] The diamonds 38, for example, have a granular shape. Such shapes are particularly well suited for use in recesses 32. The diamonds can also have a regular shape, such as a cube. This results in a uniformly shaped dressing surface 31 for evenly shaped recesses.

[0068] The recesses 32 can be produced, for example, by graining with a suitable grainer. The recesses have, for example, inclined side surfaces that meet at the deepest point of the recess.

[0069] Grooves 33 for receiving edge reinforcements can be provided in the peripheral edge 35 of the dressing tool 30. The edge reinforcements are plate-shaped or rod-shaped diamonds (or CBN elements) (e.g., rods, disks, plates, or shapes cut from plates, in particular mold plates) that are secured in the grooves 33 by soldering. Such diamonds or CBN elements of an edge reinforcement are each directly connected to three or four inner sides of a groove 33 using a solder.

[0070] The dressing tool 30 has an opening 36 in its center, which can be used to attach the dressing tool to the rotating drive. Depending on the arrangement of the grooves 7 and their geometry relative to the direction of rotation in which the dressing tool is used, co-rotating or counter-rotating dressing processes with infeed can be implemented.

Claims

1. Dressing tool (1) comprising a base body and one or more dressing surfaces (2, 3) or one or more dressing edges (21), wherein the dressing surfaces or edges are covered with hard material elements such as diamonds or CBN elements (8), characterized in that slots (7) are provided, wherein in each slot (7) a plurality of hard material elements (8) is soldered with solder (9), wherein the hard material elements stand out from the slot and the depth of the slot is smaller than half of the used average grain size of the hard material elements.

2. Dressing tool according to claim 1, characterized in that the slots (7) are formed by a indentation in the dressing surface (2, 3) or in a side surface (24) arranged next to a dressing edge (21) and the hard material elements and the solder fill out the slots.

3. Dressing tool according to one of claims 1 or 2, characterized in that the slots (7) run spirally from inside to outside.

4. Dressing tool according to one of claims 1 to 3, characterized in that the stocking density of hard material elements (8) remains constant from inside to outside in a region of a dressing surface (2, 3) in at least a part of the dressing surface (2, 3).

5. Dressing tool according to one of claims 1 to 3, characterized in that the slots (7) run radially or slanted to the radial direction to the outside to a dressing edge (21), such as in a side surface (24) arranged next to a dressing edge (21).

6. Dressing tool according to one of claims 1 to 5, characterized in that in a slot at least 5 or 10 or 40 or 50 or 100 hard material elements (8) are arranged.

7. Dressing tool according to one of claims 1 to 6, characterized in that the dressing tool comprises one or two dressing surfaces (2, 3).

8. Dressing tool according to one of claims 1 to 7, characterized in that the dressing tool (1) comprises a dressing edge (21) arranged at the perimeter.

9. Dressing tool according to one of claims 1 to 8, characterized in that the dressing tool (1) comprises an edge protection (15) in form of additional hard material elements in the region of the perimeter edge (4) or the perimeter surface.

10. Dressing tool according to claim 9, characterized in that the additional hard material elements of the edge protection (15) are plate-shaped, rod-shaped or hard material elements cut out of plates, which are soldered into slots, drilled holes, slits or indentations in the region of the perimeter edge or the perimeter surface.

11. Dressing tool according to one of claims 1 to 10, characterized in that the hard material elements in the slots are hard element splitter, such as diamond splitter or CBN splitter or grain-shaped, rod-shaped, plate-shaped or hard material elements (8) cut out of larger plates.

12. Dressing tool according to one of claims 1 to 11, characterized in that the length of the slots (7) is, for instance, more than 10 times or 20 times or 30 times the width of the respective slot (7).

13. Dressing tool (30) comprising a base body and one or more dressing surfaces (31), wherein the dressing surfaces are covered with hard material elements (38), characterized in that indentations (32) are arranged in a regular pattern in the dressing surfaces (31) and in each indentation (32) a single hard material element (38) is soldered with solder, wherein the solder and the hard material element completely fill out the indentation and that solder protrudes beyond the indentation and covers a part of the surface of the metallic base body next to the indentation, wherein the solder also covers a part of the surface of the hard material element.

14. Dressing tool according to claim 13, characterized in that the indentations (32) lie in traces (34), which run spirally in a dressing surface (31) of the dressing tool (3) from inside to outside.

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