EP4034335B1 - Dressing tool and method for the production thereof - Google Patents

Description

The invention relates to a dressing tool and a method for its production according to the preamble of claim 1 and claim 7 respectively.

Dressing grinding worms is a highly demanding, generative machining process in generating grinding, based on a multitude of synchronized, highly precise individual movements and determined by special dressing tools. For high productivity, solid profile rollers are used as typical rotating dressing tools for the lower module range. These are characterized by combining all profiling tasks for the worm flanks, tips, and roots in a single tool. Correct adaptation to the workpiece flank geometry is necessary, resulting in very limited application flexibility. A disadvantage, therefore, is the lack of correction options, for example, for profile angle deviations. These tools achieve comparatively short dressing times.

In the printed matter EP 3 254 806 A1 is a method for producing a dressing tool for a grinding tool, preferably for a A grinding worm is disclosed in which the dressing tool has at least one radially extending projection. This involves producing a shaped ring which has, on a radially inner surface, a number of recesses corresponding to the number of projections, which recesses are formed congruently with the projections. An abrasive material, in particular diamond powder, is then placed in the recesses. By creating an electrochemical coating in the recesses, the abrasive material is fixed in the area of the surface of the recesses. The shaped ring is then removed to obtain the dressing tool thus created. A support element is placed in the area of the radially inner surface, which support element is at least partially bonded to the resulting dressing tool by the coating.

In the printed matter DE-A-10 2009 059 201 A full-profile dressing roll for dressing or profiling multi-start grinding worms for generating grinding of small-module gears is disclosed. It features a groove-shaped axial cut profile with an outer surface coated with hard material grains and profile-cut hard material segments embedded in this surface. This dressing roll with the profile crests is manufactured using the known negative process by metal deposition in a negative mold, which has an inner surface shaped complementarily to the outer surface of the dressing roll.

For a dressing tool according to the publication DE-A-43 39 041 For profiling double-start cylindrical grinding worms for generating grinding of spur gears, a first dressing roller with two oppositely conical first and second flanks coated with hard material grains and a coaxial second and third dressing roller are provided. The three dressing rollers are mounted on a common shaft or bushing and separated from each other by two spacers. With such a dressing tool, the three dressing rollers engage in three adjacent grinding worm flights, resulting in a slight increase in the dressing stroke, but a significant reduction in stroke. This dressing tool is relatively complex to manufacture, but nevertheless unsuitable for high-precision This also means that high-precision flank profiles cannot be produced on the grinding worm, which has a direct negative impact on the accuracy of the gears being manufactured.

The main problem with many of these different dressing techniques is that two spatial active surfaces always move in space: on the worm flank and on the dressing tool, and these surfaces are very often composed of partial surfaces. Under these spatially moving contact conditions, contact points that determine the geometry often arise that are not located in the axial section plane of the dressing tool. If this occurs, even with the most careful design of the dressing profile, inadequate dressing and grinding quality often results.

In generating grinding, it has been shown that the well-known solid profile roller, in particular, but also the well-known set profile roller, are used in a variety of ways for dressing grinding worms. These dressing tools are used separately for different applications, with the scattered or hand-set diamond coating of the solid profile roller being applied using the negative electroplating process, and the corresponding diamond coating of the set profile roller being applied using the positive electroplating process. The required accuracy of the set profile rollers previously required the use of the positive electroplating process with the option of post-treatment.

In the series production of gears, the solid profile roller has proven to be an excellent choice for profiling grinding worms. However, due to the contact of a solid profile roller across multiple grinding worm threads, correcting a profile angle deviation is not possible.

For other gear cutting tasks that require corrections to the profile angle deviation, so-called set profile rollers are also often used for dressing. Both dressing tools require only a rotating dressing spindle and, when using set profile rollers, an additional NC axis for pivoting this dressing spindle. Although this set profile roller does not achieve the productivity of the full profile roller and is only suitable for profiling a worm gear, this dressing tool practically allows for sufficient pivoting to symmetrize profile angle deviations as well as pitch changes to symmetrically influence these profile angle deviations. Accordingly, this dressing tool can reliably correct a process-related profile angle deviation of approximately one angular minute, which occurs in total when profiling a grinding worm with, for example, an initial outer diameter of approximately 300 mm, which is then reduced to approximately 100 mm through a large number of dressing operations during the grinding of a batch.

The invention is based on the object of creating a dressing tool based on these known full-profile rollers and set-profile rollers, by means of which grinding worms can be profiled with high productivity, precision, and also with adjustment. Furthermore, these should be efficient to manufacture and significantly increase the service life of the dressing tool.

This object is achieved according to the invention by the features of claim 1 and claim 7 .

According to the invention, the dressing tool has two to preferably six profiles arranged coaxially to one another and a metallic base body, wherein all profile shapes are provided with the hard material particles of the Profiles are produced by a negative process with a casting compound applied to the base body.

The dressing tool is produced using the well-known negative electroplating process. The resulting high-precision nickel-diamond matrix is then bonded to the base body using a casting compound, also known as an adhesive, and/or other castable materials, resulting in the inventive dressing tool as a unit. The base body, including the casting compound and the nickel-diamond matrix, can be produced in one or two pieces.

With this base body and a lightweight, vibration-inhibiting and thus dampening cast compound, disruptive vibrations on the rotating spindle that holds the dressing tool can be greatly reduced or even eliminated during operation.

According to the invention, the coaxially arranged profiles of the dressing tool form at least two differently shaped lateral surfaces, each of which is assigned a one-piece metallic base body that is coaxially attached to one another. This dressing tool thus consists of the base body, the electroplated nickel-diamond matrix, and the casting compound that bonds the nickel-diamond matrix to the base body.

With this compact design of the dressing tool with the different outer surfaces formed by the profiles on the outside, advantages of both dressing tools are achieved in various respects and This dressing tool can even be manufactured at lower manufacturing costs.

These profile surfaces are conical, cylindrical, and/or other shapes, and the profiles of each surface are advantageously designed as so-called set and full profile rollers. This dressing tool thus enables highly productive and highly precise profiling of grinding worms.

In the method according to the invention, in the negative process with at least one negative mold with complementary profile shapes, special hard material particles are fixed into the base of the complementary profile shape of the negative mold by galvanic application of hard material particles using centrifugal force. After removal of the negative mold, these particles will then remain predominantly on the outer radii of the profile shapes of the corresponding profiles and protect the particularly wear-prone area of the dressing tool during profiling of the grinding worms, thus increasing the overall service life of the dressing tool.

Fig. 1

eine Ansicht mit teilweisem Längsschnitt eines Abrichtwerkzeugs als Stand der Technik;

Fig. 2

eine Ansicht mit teilweisem Längsschnitt eines weiteren Abrichtwerkzeugs als Stand der Technik;

Fig. 3

einen Längsschnitt mit teilweiser Ansicht eines erfindungsgemässen Abrichtwerkzeugs;

Fig. 3a

ein Detail A1 nach Fig. 3 als Schnitt von Profilen;

Fig. 3b

ein Detail A2 nach Fig. 3 als Schnitt von Profilen;

Fig. 4

einen Längsschnitt mit teilweiser Ansicht eines weiteren Abrichtwerkzeugs bzw. einer Schleifschnecke im Eingriff beim Profilieren;

Fig. 4a

ein Detail A3 als Schnitt des Eingriffes der einen Profilen des Abrichtwerkzeuges in der Schleifschnecke nach Fig. 4;

Fig. 4b

ein Detail als Schnitt des Eingriffes der andern Profilen des Abrichtwerkzeuges in der Schleifschnecke nach Fig. 4; und

Fig. 5

einen Längsschnitt mit teilweiser Ansicht des Abrichtwerkzeugs nach Fig. 4.

The invention and its further advantages are explained in more detail below using exemplary embodiments with reference to the drawing. It shows:

Fig. 1

a view with partial longitudinal section of a dressing tool as prior art;

Fig. 2

a view with partial longitudinal section of another dressing tool as prior art;

Fig. 3

a longitudinal section with a partial view of a dressing tool according to the invention;

Fig. 3a

a detail A1 after Fig. 3 as a section of profiles;

Fig. 3b

a detail A2 after Fig. 3 as a section of profiles;

Fig. 4

a longitudinal section with a partial view of another dressing tool or grinding worm in engagement during profiling;

Fig. 4a

a detail A3 as a section of the engagement of one profile of the dressing tool in the grinding worm according to Fig. 4 ;

Fig. 4b

a detail as a section of the engagement of the other profiles of the dressing tool in the grinding worm according to Fig. 4 ; and

Fig. 5

a longitudinal section with partial view of the dressing tool according to Fig. 4 .

Fig. 1 and Fig. 2 Each shows a known dressing tool 6, 7, which serves for profiling the flanks of dressable grinding worms 1, which in turn are used for grinding correspondingly designed gears. Such dressing tools 6, 7 are advantageously suitable for gears in the module range of 0.15 to 5 mm. The rotation axes B2, the bores 8, and the test collars 9 arranged in a hub-like manner on both sides are shown.

In the dressing tools 6 and 7, which are designed as so-called set profile rollers and full profile rollers, the profiles 11.1, 11.2 and 12.1, 12.2, 12.3, 12.4 are formed by profile grooves, the working surfaces 13 and 14 of which are created by opposite flanks with head and root areas and which are equipped with corresponding hard material particles 21, 22.

Fig. 3 shows a dressing tool 10 which is provided with profiles 11.1, 11.2, 12.1, 12.2, 12.3, 12.4 arranged in a coaxial alignment along the axis B2. These profiles are delimited on their outer circumference by two lateral surfaces 23, 24, one of which is approximately cylindrical and the other conical. This conical lateral surface 24 runs at an angle δ to the cylindrical lateral surface 23, viewed in the axial cross-section. Arranged in series on the conical lateral surface 24 are up to four profiles 12.1, 12.2, 12.3, 12.4, each with a working surface 14 as a solid profile, and on the cylindrical lateral surface 23 are two profiles 11.1, 11.2, each with a working surface 13 as a set profile.

Of course, the number of profiles and thus the working surfaces 13 and 14 and/or the shape of the lateral surfaces 23, 24 of this dressing tool 10 could be designed differently as required. Thus, within the scope of the invention, the dressing tool 10 could also have only three coaxially arranged profiles 11.1, 11.2, 12.1, with these three profiles being supported on the base body 19 by a casting compound 15.

According to the invention, this dressing tool 10 with the several profiles 11.1, 11.2, 12.1, 12.2, 12.3, 12.4 has a metallic base body 19 with the respective lateral surfaces 23, 24, wherein the profile shapes of these profiles 11.1, 11.2, 12.1, 12.2, 12.3, 12.4 consist of a diamond-enriched nickel matrix produced by means of a negative process, which is connected to the base body 19 by the casting compound 15. After the application of the diamond-enriched nickel matrix to the negative mold by means of centrifugal force and the precise insertion of the Base body 19 the filling or pouring of the casting compound 15 into the cavity.

The casting compound 15 is applied to the respective base body 19. Ring-shaped projections 18 formed by the casting compound 15 are provided on both sides of the profiles so that the casting compound can be filled between the negative mold (not shown) and the base body 19 during the negative process.

The base body 19 is annular and has an outer shell encased in the casting compound 15. The outer shell 20 of this base body 19 is very advantageously cylindrical, making it easy to manufacture. However, it could also be partially conical, for example, parallel to the outer surface 24, and contain one or more annular recesses into which the casting compound would penetrate, thus providing better grip.

The casting compound 15 consists of a synthetic resin mixture with several suitable components, based, for example, on epoxy resin or polyurethane resin. Suitable adhesives can also be used. These materials generally have a significantly lower density and better damping properties than metal. This allows a total weight saving of over 20% for the dressing tool 10 compared to the known positive process and a metallic formation of the various profiles.

It is also designed in such a way that it does not melt during the dressing process and remains resistant, even if higher temperatures occur due to the grinding friction between the outer diamond-containing nickel layer 22 and the grinding worm 1.

In the tool part with the conical surface 24, the angle of inclination δ of the working surface 14 with the profiles 12.1, 12.2, 12.3, 12.4 formed in cross section is selected so that the respective flank of each of these profile teeth, as in Fig. 3a As can be seen, for a given pressure angle α, the dressing tool 10 always forms a positive clearance angle q> with an imaginary perpendicular 25 to the rotational axis B2 of the dressing tool 10. With a negative clearance angle φ, this flank of profile 12.3 according to detail A1 would essentially form a shadow in the negative mold, and thus this profile could not be produced using this negative process. This clearance angle φ should therefore be between 2° and 5°.

Since such a dressing tool 10 is also used as a high-precision tool for fine profiling, a hub-shaped test collar 16 is assigned to both sides of the base body 19 for checking the concentricity of the clamped tool 10 on a dressing spindle of a grinding machine.

Fig. 3b shows a detail A2 according to Fig. 3 , in which this hard material coating is schematically illustrated on the working surface 13, which is equipped with stochastically distributed hard material particles 22 in the nickel diamond matrix. Furthermore, hard material particles 21 are fixed predominantly in the head area of the profiles 11.1 and 11.2 over their circumference. The fitting can also be used on the work surfaces 14 of the profiles 12.1, 12.2, 12.3, 12.4 with the solid profile.

According to the invention, in the negative process, special hard material particles 21 are fixed into the base of the complementary profile shape of the negative mold (see Fig. 3b These special hard material particles are synthetic diamond from the gas phase. They protect the head area of the dressing tool 10, which is particularly subject to wear, during the profiling of the grinding worms 1.

The hard material particles 21 applied by the negative process are preferably dimensioned with a grain diameter in the range between 90 and 600 µm and are preferably designed with an external shape as a tetragon, hexagon, octahedron, or dodecahedron. Consequently, the overall service life of the dressing tool 10 can be significantly increased because these grain diameters are larger than those of known particles. In the previous production of set profile rollers 6 using the positive process, hard material particles with grain diameters of this magnitude can only be produced with very high manufacturing costs due to their geometry.

Instead of conventional hard material particles, a special type of diamond is used, which, due to its morphology and pattern, creates a different surface appearance of the ceramic grinding worm to be profiled and consequently develops different properties on the workpiece surface of the gears to be ground. In contrast to conventional diamond grains, this special type of diamond provides the surfaces of the flanks of the grinding worm with defined Provided with cross-section patterns. A special synthesis type IIA material is used for this particular diamond type.

In the known negative process, hard material particles 21, 22 and an additional nickel layer are galvanically deposited into the complementary profile shapes of the negative mold using centrifugal force. Subsequently, the base body 19 is placed centrally and in a precise axial position in the negative mold, and the viscous casting compound 15 is then emptied between them, filling the complementary profile shape with the casting compound 15. Once the casting compound has solidified and bonded to the base body 19, the negative mold is removed by machining, leaving only the base body 19 and the solidified casting compound 15 with the adhering hard material particles 21, 22 in the diamond-interspersed nickel matrix. Thus, the dressing tool 10 is completed.

By manufacturing the dressing tool 10 using this negative process, vibrations during the dressing process can be significantly reduced or even minimized, thus largely enabling subsequent generating grinding while avoiding so-called ghost frequencies. This is primarily achieved through the combination of this base body 19 and the lightweight casting compound 15 made of a vibration-damping synthetic resin mixture.

Fig. 4 shows a dressing tool 10' which is essentially the same as that according to Fig. 3 and therefore the differences are explained below. The same reference numerals are used for the same components as for the dressing tool 10 according to Fig. 3 used.

This dressing tool 10' is engaged in a grinding worm 1, whereby the working surface 14 of the profiles 12.1, 12.2, 12.3, 12.4 is engaged with the solid profile, i.e. these profiles are each profiled with both flanks simultaneously.

According to the invention, in this Fig. 4 the second embodiment is shown as a two-piece dressing tool 10', in contrast to that according to Fig. 3 . Both embodiments 10, 10' of this new dressing tool can be used for the same profiling of grinding worms 1 without any process differences.

In Fig. 4a According to detail A3, tooth gaps 2, 3, 4, and 5 of grinding worm 1 are shown in cross-section, with profile 12.1 (and thus the entire working surface 14) engaging with the grinding worm in tooth gap 2. Profiles 11.1 and 11.2 of the pivoted working surface 13 are disengaged in tooth gaps 4 and 5. Tooth gap 3, on the other hand, is free of profiles.

If, during the design of this dressing tool 10, 10', it can be seen in a graphic control image that the non-engaging profile tooth of profile 11.1 collides with the profile tooth of the grinding worm located at tooth gap 4, then this profile tooth of profile 11.1 must be inserted with a sufficient distance on both sides to the flanks of the next tooth gap 5 of the grinding worm 1. For very small module sizes, the distance between the two profiles 11.1 and 12.1 can be more than two tooth gaps. The only limiting factor here is the length of this dressing tool 10, 10'. which determines the required distance of a dressing stroke. If, on the other hand, the control image is found to be satisfactory, then profile 11.1 is located at the same distance from the flanks of the respective tooth gap. The set profile and the solid profile can be designed mathematically and/or graphically according to known principles of gear cutting. Therefore, the angle of inclination δ of the conical to the cylindrical surface 23, 24 is approximately equal to the pressure angle α minus the clearance angle φ.

In Fig. 4b is shown as an analogous detail when the profiles 11.1, 11.2 of the working surface 13 of the set profile are in engagement with the grinding worm 1. In this profiling dressing tool 10', the profiles 11.1, 11.2 are in engagement with the opposing flanks and profile the grinding worm 1 between the tooth gaps 4 and 5. If a control image shows a collision of the profile 12.1 with the flanks of the tooth gap 2, then the previously roughly determined inclination angle δ must be changed in increments of +/- 1° or the distance between the profiles 11.1 and 12.1 is increased as described above.

When profiling the grinding worm 1 with the dressing tool 10', the tool part rotating at the dressing speed with the profiles 12.1, 12.2, 12.3, 12.4 designed as a solid profile is used first, whereby the surface line created in the axial section of its conical virtual surface 24 is pivoted parallel to the cylindrical grinding worm 1. Once the pre-profiling of the grinding worm 1 is completed after several dressing strokes, the fine profiling takes place in stages. the grinding worm 1 with the tool part designed as a set profile.

For this purpose, the cylindrical outer surface 23 with the two profiles 11.1 and 11.2 must also be pivoted parallel to the cylindrical grinding worm 1 by means of the NC axis. A particularly advantageous feature here is that the profile angles, which constantly change due to profiling, on the grinding worm, whose diameter decreases with each dressing process, can be corrected as needed by a simple pivoting movement of the dressing tool 10. Using this innovative dressing tool 10, 10', highly productive, highly precise, and correctable profiling during generating grinding is relatively easy.

While the engagement of profiles 12.1, 12.2, 12.3, 12.4 serves as a roughing tool for quickly profiling the worn grinding worm material, profiles 11.1, 11.2 can be used to produce the required target profile of the individual worm threads very precisely and in a correctable manner.

Fig. 5 shows the dressing tool 10' from Fig. 4 , which, as mentioned, is constructed in two pieces, in which the profile shapes of profiles 11.1, 11.2, 12.1, 12.2, 12.3, and 12.4 are created analogously using a negative process. The subsequent application of a casting compound is also carried out in a similar manner.

Within the scope of the invention, in this two-piece dressing tool 10', not only the base bodies 19, 19', but The casting compounds 15, 15' and the hard material particles 21, 22 with the diamond-encrusted nickel matrices are generally made in two pieces. The negative mold can consist of either one or two pieces.

The base bodies 19', 19" are coaxially attached to one another and are advantageously each shaped on the outer shell 20 parallel to the shell surfaces 23, 24 formed by the profiles. Preferably, the base bodies 19, 19' are highly precisely centered for coaxial alignment with one another by a centering bore with undercut 17 and a centering collar 16 that engages therein, each of which is annular. This allows these base bodies 19, 19' to be fitted at a defined distance and, for example, screwed together. For this embodiment, the rotary base surface 27 is the base surface for the geometric structure of all profiles 11.1, 11.2, 12.1, 12.2, 12.3, 12.4, whereby the intersection point 26 between the two shell surfaces 23, 24 should be located in the immediate vicinity of this base surface 27.

A particularly advantageous embodiment of this dressing tool 10' can consist in the two-piece casting materials 15, 15' and the hard material particles 21, 22 with the diamond-encrusted nickel matrices also being made with different casting materials and hard material particles. For this purpose, the first and second pieces of the dressing tool 10' are manufactured separately as individual parts and then screwed together. This increases the manufacturing effort, but optimized hard material particles 21, 22 and casting materials 15, 15' can be used preferentially for both working surfaces 13, 14.

Thus, within the scope of the invention, they could be used either as an optimized combination tool or separately as individual tools. Depending on the service life of the profiles on a base body 19, 19', one or the other piece can be replaced.

The invention is sufficiently illustrated by the embodiments and examples explained above. However, it could of course be further illustrated by other variants.

The outer surfaces of the profiles could be conical, cylindrical, and/or differently shaped, and the profiles of each outer surface could be designed as a set or solid profile roller. Thus, the coaxially arranged profiles could form more than two differently shaped outer surfaces on the outside, for example, one cylindrical and two conical ones, each with a different angle of inclination δ. The profiles of the cylindrical outer surface could be designed as set rollers, and the others as solid profile rollers.

LIST OF REFERENCE SYMBOLS

1

grinding worm

2

first tooth gap (according to detail 3A)

3

second tooth gap (= free gap)

4

third tooth gap

5

fourth tooth gap

6

Set profile roller

7

Full profile roller

8

drilling

9

Test bundle

10

Dressing tool with one-piece base body

10'

Dressing tool with two-piece base body

11.1

first profile of a sentence profile

11.2

second profile of a sentence profile

12.1

first profile of a full profile

12.2

second profile of a full profile

12.3

third profile of a full profile

12.4

fourth profile of a full profile

13

Work surfaces typesetting profile

14

Work surfaces full profile

15

Casting compound

15'

Casting compound

16

Centering collar

17

Center hole with undercut

18

Ring-shaped approach

19

Basic body

19'

Basic body

19"

Basic body

20

lateral surface, cylindrical

20'

Shell surface, conical

21

Hard material particles

22

Hard material particles in nickel diamond matrix

23

lateral surface, cylindrical

24

Shell surface, conical

25

Perpendicular to B2

26

Intersection between the lateral surfaces 23 and 24

27

Base area for the geometry structure of both work surfaces

B1

Rotation axis of the grinding worm

B2

Rotation axis of the dressing tool

m

module

α

Pressure angle

δ

Angle of inclination

φ

clearance angle

Claims (8)

1. Dressing tool, with profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) arranged coaxially to one another, each with a profile form in conical in axial cross-section and with working surfaces (13, 14), which are provided with hard-material particles (21, 22), wherein the profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) are delimited at the outer circumference by at least one surface (23, 24), wherein the profile forms with the hard-material particles (21, 22) of the profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) are produced by a negative process with a casting compound (15, 15'), wherein the dressing tool (10, 10') comprises between two and preferably six profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) arranged coaxially to one another, and a one-part or two-part metallic main body (19, 19', 19") for the entire dressing tool (10, 10') or for a respective casing surface (23, 24), wherein the profile forms are produced by the negative process with a casting compound (15, 15') applied on the respective main body (19, 19', 19"), wherein the profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) form on the outside two differently formed casing surfaces (23, 24), of which the profiles of the one surface are configured as set-profile rollers and those of the other as full-profile rollers, wherein the profiles are provided with corresponding working surfaces (13, 14), wherein the one casing surface (23) is configured as cylindrical with preferably two profiles (11.1, 11.2) and the other surface (24) is configured as conical, with two or preferably four profiles (12.1, 12.2, 12.3, 12.4), wherein adjacent working surfaces (13, 14) of the profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) are spaced at a distance interval to the base surface (27) in such a way that, at the grinding worm (1) which is to be profiled, with several defined tooth gaps (2, 3, 4, 5), the one tooth gap (3) of the working surfaces (13, 14) is always free, and in this situation either the set-profiles (11.1, 11.2) or the full-profiles (12.1, 12.2, 12.3, 12.4) can be pivoted into the residual tooth gaps without any collision.
2. Dressing tool according to claim 1, characterized in that
   these profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) are configured as set-profile rollers or full-profile rollers, and their casing surfaces (23, 24) of which are configured in each case as conical, cylindrical, and/or another shape.
3. Dressing tool according to claim 1 or 2, characterized in that
   the profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) arranged coaxially to one another form on the outside at least two differently formed casing surfaces (23, 24), allocated to each of which is a one-part main body (19', 19"), which are secured coaxially to one another, or to which a one-piece main body (19) is assigned for the entire dressing tool (10).
4. Dressing tool according to any one of the preceding claims 1 to 3, characterized in that
   the outer casings (20, 20') of the main body (19, 19', 19") run parallel to the respective casing surfaces (23, 24) formed by the profiles.
5. Dressing tool according to any one of the preceding claims 1 to 4, characterized in that
   the outer casings (20) of the main body (19") are formed as cylindrical, and the profile moulds of the profiles (11.1, 11.2) are produced on this by the negative mould and the casting compound (15) introduced into it.
6. Dressing tool according to any one of the preceding claims 1 to 5, characterized in that
   an inclination angle (δ) is present between the two differently formed casing surfaces (23, 24) which is selected in such a way that the profiles (12.1, 12.2, 12.3, 12.4), formed in cross-section as profile teeth with a predetermined engagement (α), which form the conical casing surface (24), with an imaginary perpendicular line (25) to the rotation axis (B2), always exhibit a positive free angle (φ) to the next located flank of a respective profile tooth.
7. Method for producing a dressing tool according to any one of claims 1 to 6, wherein with the negative process, with at least one negative mould and with complementary profile moulds, by galvanic application of hard-material particles by means of centrifugal force, special hard-material particles (22) are fixed into the base of the positive mould complementary to the negative mould, which, after the removal of the negative mould, remain at the outer radii of the profile moulds of the profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4), and protect the region of the dressing tool (10) particularly subject to wear during the profiling of the grinding worm, wherein the profile forms are produced by the negative process with a casting compound (15, 15') applied on the respective main body (19, 19', 19"), wherein the profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) form on the outside two differently formed casing surfaces (23, 24), of which the profiles of the one surface are configured as set-profile rollers and those of the other as full-profile rollers, wherein the profiles are provided with corresponding working surfaces (13, 14), wherein the one casing surface (23) is configured as cylindrical with preferably two profiles (11.1, 11.2) and the other surface (24) is configured as conical, with two or preferably four profiles (12.1, 12.2, 12.3, 12.4), wherein adjacent working surfaces (13, 14) of the profiles (11.1, 11.2, 12.1, 12.2, 12.3, 12.4) are spaced at a distance interval to the base surface (27) in such a way that, at the grinding worm (1) which is to be profiled, with several defined tooth gaps (2, 3, 4, 5), the one tooth gap (3) of the working surfaces (13, 14) is always free, and in this situation either the set-profiles (11.1, 11.2) or the full-profiles (12.1, 12.2, 12.3, 12.4) can be pivoted into the residual tooth gaps without any collision.
8. Method according to claim 7, characterized in that
   the hard-material particles applied by the negative process are dimensioned with conventional grain diameters, and are configured with an outer form preferably as a tetragon, hexagon, octahedron, und/or dodecahedron.