EP3444071A1 - Dressing tool with solid elements in tracks - Google Patents

Abstract

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 occupied by hard material elements, wherein grooves are provided, wherein in each groove a plurality of hard material elements soldered with solder. Also, the invention relates to a dressing tool in which depressions are arranged in a regular pattern and in each well a single hard material element is soldered with solder.

Description

Dressing tools are known from the prior art in which diamonds scattered by a galvanic process are fixed to a base body by means of galvanically deposited nickel. Depending on the grain size of the diamonds, different densities of diamonds arise on the surface. The arrangement of the diamonds results from the scattering of the diamond grains, which lie against each other during the scattering on the surface of the base body.

Next is from the DE 29819006 U1 a diamond dressing disc known in which diamonds are inserted in substantially radially extending grooves in the region of the end face of the dressing wheel.

The WO 2017/042395 A1 further discloses a dressing tool in which hard grains are bound in a layer and in addition in the layer distributed integral platelets or rod-shaped dressing elements of a hard material are connected to the carrier. Object of the present invention is to provide a dressing tool in which a dressing surface or a dressing edge is created by means of a plurality of diamonds, so that the stocking density can be adjusted in a controlled manner. It may also be desirable to create a controlled chip space.

The problem is solved with a dressing tool according to claim 1.

Exemplary embodiments are given in the subclaims.

The hard material elements may be diamonds or may consist of or comprise cubic boron nitride (CBN). In the following description of the description, reference will be made, by way of example only to diamonds, but CBN elements may also be provided instead of the diamonds. In principle, all references to diamonds are to be understood as exemplary in the following description. Alternatively, it is also possible to use all other hard material elements which are mentioned by way of example below. Suitable materials that make up or comprise the hard material elements are also MKD, CVD, PCD (polycrystalline diamonds) and, in particular, natural diamonds and, in particular, synthetic diamonds. Furthermore, cubic boron-carbon nitride (cBC2N) can be used as a material.

To fasten a plurality of diamonds, grooves are provided in a (metal) base body of the dressing tool, and in each of these grooves are a plurality of diamonds soldered with a solder. By specifying corresponding grooves, the stocking density can be adjusted in a controlled manner with diamonds and at the same time the area or shape suitable for a soldering process can be created. In each track, a plurality of diamonds are arranged so that there is the greatest possible flexibility in terms of the shape of the grooves. Furthermore, a groove can be sufficiently filled with diamonds.

The main body itself may consist of or comprise a metallic material, for example steel. In some embodiments, the body can also be made of or include a non-rusting material such as stainless steel. The base body can also be produced by means of a cutting process from an arbitrarily shaped "blank". Cutting processes are all processes in which the body to be produced is manufactured from a "blank" by stock removal from "excess" material. The excess material is thus mechanically removed from the blank - in the form of chips - until the body to be produced is present.

The grooves can also be formed in the main body by a machining process. This can be done either simultaneously with the shaping of the base body by means of a cutting process or following the production of the base body. Here, based on the machining process (see above), the base body without grooves represents the "blank", the base body with grooves the body to be produced.

The grooves have a length which is significantly greater than the width. This results in traces in which diamonds can be well placed to fill a surface and the stocking density is simultaneously controlled adjustable with diamonds. For example, the length of the groove may be more than 10 or 20 or 30 times the width of a groove.

Between the diamonds in the grooves, it is possible to create a chip space by removing removed material in a dressing process can be.

Especially with dressing tools, which are fixed with a galvanic process or a sintering process diamonds on a body, it may happen when using a dressing tool that no chip space is available and thus the dressing tool can only work with a high contact pressure.

The grooves are formed for example by a depression in a dressing surface or in a side surface which is arranged next to a dressing edge. Diamonds and the solder can fill in the grooves and they can also stick out of the grooves. In a cross section of the Groove, the cross section may also be completely filled with diamonds and solder in some or all places of the groove.

To create a dressing surface, it is advantageous if the grooves on the dressing surface spiral from the inside to the outside. This makes it possible to provide an equal stocking density on an inner as well as on a more remote part of the dressing surface.

For example, the stocking density of the diamonds from the inside to the outside in a region of the dressing surface is constant at least in a part of the dressing surface.

For example, the grooves may also extend radially outward and terminate in a dressing edge (radially when viewed along the central axis or a central opening of the dressing tool). In the dressing edge, diamonds are provided on the dressing edge through the grooves in which the diamonds are arranged. For this purpose, the diamonds can be held in grooves which are arranged in a side surface which is provided laterally next to a dressing edge. As a result, even with wear of the dressing tool, in which the circumference is reduced, continue to be created a functional dressing edge.

The radially outwardly extending grooves have a plurality of diamonds, for example at least 10 or 20 diamonds. For spirally outwardly extending grooves that form a dressing surface, for example, at least 40 or 75 or at least 100 diamonds or more are provided so as to achieve a uniform dressing effect over the entire surface.

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

Furthermore, an edge protection can be provided, for example, in the region of the circumference of a dressing tool, which is provided for example by additional diamonds or CBN elements in the region of the peripheral edge or a circumferential surface. The areas of a dressing tool that would eventually wear out first can be reinforced so that a longer tool life can be achieved. In the following, particular attention is paid to the edge protection with diamonds, but instead of the diamonds also CBN elements can be used for the edge protection.

The diamonds (or alternatively the CBN elements, as mentioned earlier) of the edge protector can be in various geometries, such as rods, discs, plates, or as sliced shapes (mold plates).

In principle, embodiments are preferred in which the diamonds are present as mold plates. The molded plates on hard material are usually cut from a larger material plate (for example by means of a laser) elements. These mold plates may, but need not be rod-shaped or plate-shaped. In the following, the mold plates are also used synonymously for "hard materials" and "hard material elements" as well as "diamonds". The mold plates are initially not limited in terms of their shape. As described above, shapes such as plates, sticks, slices and the like can be realized. The thickness of the material plate is usually much smaller than the other dimensions of the material plate and when cutting the mold plates is cut in the direction of the thickness of the material plate (ie through the material plate through). Typically, the thickness of the sheet of material from which the mold sheets are cut is no more than 0.1mm. It is also possible to use material plates whose thickness is not greater than 2 mm, preferably not greater than 1 mm. The cut from such sheets of material mold plates then have at least in one direction of the thickness of the material plate corresponding extent.

The diamonds of the edge protector are, for example, plate-shaped diamonds, which are soldered into grooves in the region of the circumference. The soldering of diamonds into grooves in the area of the circumference allows a particularly good and firm support of the diamonds in the grooves, as large areas are available with which the diamonds can be connected to the insides 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. In this case, two opposite sides of the diamond are connected to the groove. Also, the diamonds may be connected to three sides of a groove by means of solder, with one side lying between two opposite sides. The solder to the connection in each case has direct contact with the surface of a corresponding side of a groove.

The molded plates made of hard material (diamonds, CBN etc.) have in one embodiment (largest) two opposite plane surfaces which are usually parallel to each other. The mold plates may have a rectangular shape (through the remaining boundary surfaces between the two largest outer surfaces) (looking at one of the two largest outer surfaces). The mold plates or diamonds having such an outer geometry may be described as having a "plate shape" or a plate shape. The Molded plates can be considered as "rod-shaped" if the extent of a mold plate in one spatial direction is significantly greater, for example at least twice greater than the extent in the other two spatial directions. Here can be thought of an elongated cuboid with side lengths a, b, c, wherein one of the side lengths, such as a, significantly longer than the side lengths b, c. However, the mold plates may also be trapezoidal. They can also be semicircular or triangular. Also, such a mold plate may have a rectangular or square basic shape, which is followed by a trapezoid or a semicircle or a triangle. As a result, the mold plate or the hard material element has a different shape depending on the application.

It is also possible to provide diamond (or CBN) rods for the edge protection, which are inserted into corresponding holes or grooves in the area of the peripheral edge or peripheral surface.

The diamonds in the grooves are for example diamond chips or granular diamonds. Such diamonds can be well arranged in irregularly shaped grooves and allow the creation of a controlled stocking density of diamonds. Grain-shaped diamonds can z. B. as octahedron, dodecahedron, or as icosahedron or as an irregularly shaped grain. These forms either arise during the production process of the hard materials or, depending on the necessity, can also be subsequently produced by grinding in the case of natural diamonds or synthetic hard materials.

The diamonds can be MKD, CVD or PKD (polycrystalline diamonds) or diamond chips. It can also be ground or unpolished natural diamonds. Likewise, as already mentioned above, instead of diamonds, it is also possible to use boron nitride (CBN) elements or in each case splinters thereof.

The solder used may, for example, be a soft solder or a brazing alloy. The solder can be used in a soldering process such as vacuum brazing or inert gas soldering or the like for fixing the diamonds. The solder may be a nickel-containing solder containing at least 38 weight percent nickel and other metals that lower the melting point from that of nickel.

Fig. 1

eine Frontansicht eines Abrichtwerkzeugs;

Fig. 2

eine Seitenansicht eines Abrichtwerkzeugs;

Fig. 3

eine Schnittansicht eines Abrichtwerkzeugs im Bereich dessen Umfangs;

Fig. 4

eine schematische Darstellung der Anordnung von Diamanten in Nuten;

Fig. 5

eine schematische Darstellung von spiralförmig verlaufenden Nuten;

Fig. 6

eine Vergrößerung der Umfangskante mit Kantenschutzelementen;

Fig. 7, Fig. 8

eine weitere Ausführungsform eines Abrichtwerkzeugs mit einer Abrichtkante;

Fig. 9

eine weitere Ausführungsform der Erfindung.

For example, embodiments are explained in the attached figures. Showing:

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 region of its circumference;

Fig. 4

a schematic representation of the arrangement of diamonds in grooves;

Fig. 5

a schematic representation of spirally extending grooves;

Fig. 6

an enlargement of the peripheral edge with edge protection elements;

Fig. 7, Fig. 8

Another embodiment of a dressing tool with a dressing edge;

Fig. 9

a further embodiment of the invention.

Fig. 1 shows a dressing tool 2 with two dressing surfaces 2 and 3. The dressing surfaces 2 and 3 are cone-shaped, so that they in the front view of Fig. 1 have a straight line in the radial direction on the surface towards the periphery. However, instead of the straight course in the radial direction on the surface toward the periphery, a (slightly) concave or convex shape may also be provided in order, for example, to finish appropriately shaped grinding tools.

Centrally in the dressing tool 1, an opening 6 is provided, which serves to fix the dressing tool on a rotating drive. It can also be provided holes next to the opening for this purpose. The dressing surfaces 2 and 3 are arranged around a central part 5 which surrounds or forms the opening 6.

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

However, two or more dressing surfaces can be provided on the same side of a dressing tool, if this has a corresponding shape. Also, only one dressing surface (in particular so lying on one side of the dressing tool 2) may be provided, depending on the desired use of the dressing tool.

The main body 1 is usually formed by a metallic body. In this metallic body are, as in Fig. 3 to recognize grooves 7 incorporated. These grooves are provided here 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 may also have a triangular semicircular or rounded cross section.

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

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

The grooves 7 are here in cross section (s. Fig. 4a )) completely filled with diamond and solder. Some of the diamond grains or diamond chips 8 protrude out of the grooves 7 and are thus available for a dressing process. Between two grooves and the corresponding protruding from the grooves diamond 8 a chip space 12 is formed. The fact that the diamonds are held in the region of the grooves 7, the chip space 12 can be set arbitrarily by the configuration of the grooves or their distance.

It can be provided that all diamonds stick out of their groove or only a few (50% or less). At least 90% or at least 50% of the diamonds may also stick out of their groove. Whether the diamonds protrude from their groove or not can be adjusted by the grain size and depth of the groove. Thus grooves are possible which have a (small) depth of less than half the average grain size used. As a result, the diamonds are largely free and can wear out with a large portion of their volume and still be available for a dressing process. However, the depth of the grooves can also be more than half or more than 70% of the average grain size, so that the diamonds can be held quite deep in a groove, so that they are held securely against breaking.

In Fig. 4b is shown as in a cross section transverse to the extension of the groove only one diamond is arranged individually. Along the groove, however, a plurality of such diamonds (in cross-section individually) are provided. In Fig. 4c are in cross-section several diamonds provided side by side. Along the groove, there will be a multitude of groups of such diamonds. In Fig. 4b and Fig. 4c The diamonds stick out of the groove. But it can also protrude only a part such as 90% or 50% from the groove.

In Fig. 4d is shown how diamonds in cross-section in a groove can also be superimposed. One diamond is completely buried in the groove and another diamond protrudes out of the groove to some extent. In Fig. 4b and 4c Diamonds are not superimposed. In Fig. 4a the variant is shown, according to the diamonds in cross-section both above and next to each other. Some of the diamonds (eg between 30% and 70%) protrude out of the groove, others not.

Also, the stocking density, so the number of diamonds that are available per unit area for a dressing, can be selected arbitrarily by the width of the grooves 7 and by the distance of the grooves 7 in large areas. This represents a great advantage over the galvanic process, in which the diamonds are fixed out of a scattering on a base body and have a set by the grain size stocking density.

The grooves 7 may in this case have a depth which is smaller than the width of the grooves. But they can also have a depth of less than half the width of the grooves.

The grooves may have a distance to each other which is equal to or greater than the respective width of the two grooves at a respective location. The distance may 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 distance is determined. This reduces the stocking density, but the chip space between the grooves is increased.

Also, the areas between the grooves may be smaller than the width of the grooves, resulting in a relatively high stocking density with diamonds.

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

Furthermore, with the helical geometry, it is possible to make the stocking density which results, for example, in the area 10a and in the area 10b the same, that is to say that an equal number of diamonds are provided in the respective areas 10a and 10b Surfaces 10a and 10b have the same size and, however, the surface 10a is arranged radially further inward than the surface 10b.

In Fig. 6 a variant of a dressing tool is shown in more detail, in which in the peripheral edge 4 edge reinforcements 15 are still provided. The edge reinforcements 15 are provided in grooves which are arranged in the region of the peripheral edge 4. The edge reinforcements 15 are formed by diamonds preferably in the form of the plate-shaped or rod-shaped mold plates described above. The grooves are, for example, aligned radially and extend, in particular in the case of 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) ).

As an alternative to the grooves for attaching the edge reinforcements 15, in particular in dressing tools that have only one side of one or more dressing surfaces, pockets may also be arranged on the provided with a dressing surface side of the dressing tool, 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 main body, which are separated by the peripheral edge. Rather, the pockets are depressions only on one side and optionally along the peripheral edge 4.

Such a pocket may have a constant depth (measured perpendicular to a surface defined by the side surface of the dressing tool) of, for example, 1 mm, 2 mm, or 3 mm, or may have a varying depth. For example, the pocket may be deeper towards the center of the dressing tool than directly at the peripheral edge. In the following, the term "grooves" in the context of edge reinforcements will be used synonymously for the grooves and the pockets in which the edge reinforcement may be provided.

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.

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

The edge reinforcements may also be made of other hard material such as CBN. Also, the edge reinforcements may be formed from rods, discs, or sliced shapes. Here, embodiments of the diamonds in the form of the described mold plates are preferred. These can, as described above, in particular be plate-shaped or rod-shaped. These edge reinforcements are used in the region of the peripheral edge or the circumferential surface in the (metallic) body and held there, for example by soldering. For this purpose, grooves, bores, slots or the like may be provided in the region of the peripheral edge or the circumferential surface in the (metal) base body.

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

Fig. 7 and Fig. 8 shows an embodiment of the invention, in which the grooves 25 are arranged in the radial direction and terminate 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 for receiving the dressing tool 20 is provided on a rotating drive. The dressing tool 20 may have a recess 23 on a side on which the dressing edge 21 is provided, so that the dressing edge 21 can laterally be brought very close to an object or object to be dressed.

Instead of a radial alignment of the grooves up to the dressing edge, the grooves may also extend obliquely to the radial direction to the dressing edge. For example, as viewed along the opening 22 (or along the central axis), the grooves may have an angle of up to 30 ° or 45 ° with a radial direction.

In the Fig. 8 shown grooves 25 extend radially to the edge 21 (or they are oblique to the radial direction, not shown). The grooves 25 are formed in a metallic material of the main body. By the spacings of the grooves 25 and the width of the grooves 25, the stocking density with diamonds along the dressing edge 21 can be defined. Due to the arrangement of the diamonds in the grooves, even when the dressing tool is worn, in which the dressing edge 21 is displaced radially inward, work continues until the area of the grooves 25 is completely consumed.

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

The diamonds can be found in these grooves as in Fig. 4 represented and arranged there described.

It is also conceivable for straight grooves to arrange CBN elements in these rod-shaped or plate-shaped diamonds or as mentioned above. Also, shapes cut out of larger plates can be inserted into the grooves. Here, embodiments of the diamonds are preferred as mold plates.

Furthermore, the grooves, as in Fig. 8 shown, have a greater width or a same width, as the areas between the grooves, which spaced the grooves from each other. This results in a very high but controlled stocking density with diamonds. Also, the areas between the grooves can be even smaller so the width of the grooves, so that there is an even higher stocking density.

In FIG. 9 a further embodiment of the invention is shown. The dressing tool 30 has a dressing surface 31, which is formed by individual diamonds each offending each other 38. The diamonds 38 are each soldered in a single recess 32. The solder 39 for this purpose and the diamond 38 fill the recess 32 completely. 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.

On the in FIG. 9a Rear side of the dressing tool 30 may be provided a further dressing surface. This is provided on the opposite side of the dressing tool 30 in comparison to the aforementioned dressing surface 31. Such two dressing surfaces are separated by a peripheral edge 35.

As in FIGS. 9a and 9b Particularly well, the depressions 32 are arranged on tracks 34, which in turn have a spiral run from the inside to the outside. The spiral course of the tracks results in a constant stocking density with diamonds 38 on the dressing surface 31. Adjacent tracks 34 can have a constant spacing along their track, for example. In a spiral track 34, for example, at least 10, 15 or 20 or even more recesses 32, each with a diamond 38 are provided. The Wells are like in FIGS. 9a and 9b to recognize, arranged here in a regular pattern. However, there are other regular patterns than the one in FIGS. 9a and 9b shown possible.

For example, the diamonds 38 have a granular shape. Such forms are particularly well suited for use in depressions 32. The diamonds may also have a regular shape, such as a cube shape. As a result, uniformly shaped depressions also result in a uniformly formed dressing surface 31.

The depressions 32 can be produced, for example, by granulation with a corresponding grain. The depressions have, for example, inclined side surfaces which meet at the lowest point of the depression.

In the peripheral edge 35 of the dressing tool 30 grooves 33 may be provided for receiving edge reinforcements. The edge reinforcements here are plate-shaped or rod-shaped diamonds (or CBN elements) (ie, for example, rods, disks, plates or shapes cut out of plates, in particular mold plates), which are fastened in the grooves 33 by means of soldering. Such diamonds or CBN elements of an edge reinforcement are in each case directly connected to 3 or 4 insides of a groove 33 with a perpendicular.

The dressing tool 30 has in its center an opening 36, with which the dressing tool can be attached to the rotating drive. Depending on the arrangement of the grooves 7 and their geometry relative to the direction of rotation with which the dressing tool is used, co-rotating or counter-rotating dressing methods can be realized with delivery.

Claims (15)

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 occupied by hard material elements such as diamonds or CBN elements (8), characterized in that Grooves (7) are provided, wherein in each groove (7) a plurality of hard material elements (8) with solder (9) is soldered. Dressing tool according to claim 1, characterized in that the grooves (7) by a recess in the dressing surface (2, 3) or in a next to a dressing edge (21) arranged side surface (24) are formed and the hard material elements and the solder fill the grooves , Dressing tool according to one of claims 1 or 2, characterized in that all, at least 90%, at least a portion or less than or more than 50% of the hard material elements (8) protrudes out of the grooves (7). Dressing tool according to one of claims 1 to 3, characterized in that the grooves (7) extend spirally from the inside to the outside. Dressing tool according to one of claims 1 to 4, characterized in that the stocking density with hard material elements (8) from the inside to the outside in the region of a dressing surface (2, 3) in at least a portion of the dressing surface (2, 3) remains constant. Dressing tool according to one of claims 1 to 4, characterized in that the grooves (7) extend radially or obliquely to the radial direction outwardly to a dressing edge (21), such as in a laterally adjacent to a dressing edge (21) arranged side surface (24). , Dressing tool according to one of claims 1 to 6, characterized in that in a groove at least 5 or 10 or 40 or 50 or 100 hard material elements (8) are arranged. Dressing tool according to one of claims 1 to 7, characterized in that the dressing tool has one or two dressing surfaces (2, 3). Dressing tool according to one of claims 1 to 8, characterized in that the dressing tool (1) has a circumferentially arranged dressing edge (21). Dressing tool according to one of claims 1 to 9, characterized in that the dressing tool (1) has an edge protection (15) in the form of additional hard material elements in the region of the peripheral edge (4) or circumferential surface. Dressing tool according to claim 10, characterized in that the additional hard material elements of the edge protector (15) are plate-shaped, rod-shaped or cut out of plates hard material elements, which are soldered in grooves, holes or slots or recesses in the region of the peripheral edge or the peripheral surface. Dressing tool according to one of claims 1 to 11, characterized in that the hard material elements in the grooves hard material element splitter, such as diamond chips or CBN splinters or grain-shaped, rod-shaped, plate-shaped or cut out of larger plates hard material elements (8). Dressing tool according to one of claims 1 to 12, characterized in that the length of the grooves (7), for example, more than 10 times or 20 times or 30 times the width of the respective groove (7). Dressing tool (30) comprising a base body and one or more dressing surfaces (31), wherein the dressing surfaces are filled with hard material elements (38), characterized in that recesses (32) are arranged in a regular pattern and in each recess (32) a single Hard material element (38) is soldered with solder. Dressing tool according to claim 14, characterized in that the recesses (32) lie in tracks (34) which run in a dressing surface (31) of the dressing tool (3) from inside to outside spirally.

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