DE202010012502U1 - grinding wheel - Google Patents

Abstract

Circular grinding wheel (1) having a center point (M) containing a plurality of, in particular, circular suction holes (2), the center of each suction hole (2) being located at the intersection of a jet (S ₁ ) emanating from the center point (M) of the grinding wheel (1) , S ₂ , ...) is arranged with a concentric with the center (M) arranged bolt circle (K ₁ , K ₂ , ...) with radius (r ₁ , r ₂ , ...),
characterized in that
- At least one of the beams (S ₁ , S ₂ , ...) is a Einlochstrahl (S _i1 , S _i2 , ...), on which the center of only a single suction hole (2) is arranged;
- The centers of all suction holes (2) which are arranged on a Einlochstrahl (S _i1 , S _i2 , ...), substantially on a common single-hole circle (K _i ) with radius (r _i ) are;
- Each beam (S _j ) at least one radius (r _j ) has the center of a suction hole (2), at which radius (r _j ) the two in the circumferential direction of this beam (S _j ) adjacent beams (S _j-1 , S _{j + 1} ) have no center of a suction hole (2).

Description

State of the art

The The present invention relates to a circular grinding wheel with a plurality of suction holes according to the The preamble of claim 1. Such slip letters are also known as "multi-hole grinding wheels".

at the machining of a workpiece with a rotating Grinding wheel creates grinding dust, which without further action the grinding wheel would become clogged and therefore very small Life would lead. The grinding wheel must therefore often be replaced, which is extremely laborious and uneconomical.

to Fixing this problem have long been grinding wheel extraction holes known that penetrate the grinding surface. Through this Suction holes through the grinding dust can be removed become. These grinding wheels can be used on sanding plates attached, which also identify corresponding suction holes. This discharge is particularly effective when the sanding dust actively sucked by generating a negative pressure in the sanding pad becomes.

Such generic grinding wheels are for example from the EP 1 977 858 A1 known. The grinding wheels disclosed there have a plurality of suction holes, through which the dust can be sucked. Due to the special arrangement of the suction holes (the so-called "hole pattern"), it is possible to extract the grinding dust almost independently of the relative rotational position between the grinding wheel and the sanding disc. Other generic grinding wheels with other hole patterns are for example from the WO 2008/042775 A1 known, where an arrangement of the suction holes at the vertices of a triangular grid is described, or from the EP 781 629 A1 where the suction holes are located at the vertices of a square grid.

The Hole pattern should simultaneously meet a variety of criteria. On the one hand, the total area of all suction holes should be be big enough so that at all a suction can take place. On the other hand, the total area of all Absauglöcher but not too big, so enough abrasive grain on the remaining grinding surface can be arranged to even a material removal to ensure.

moreover is it desirable for practical reasons that the grinding wheel on as many different Sanding pads can be fastened, their hole pattern from provider to provider can vary a lot. There should always be a sufficient overlap between the suction holes of the grinding wheel and those of the Sanding plate present. It is also desirable that the suction power is essentially independent of the relative rotational position between grinding wheel and sanding disc is; The user no longer has to laboriously remove the suction holes bring the grinding wheel and grinding disc into line.

After all should also be the distance between the holes on the one hand not too big, otherwise no uniform extraction is possible. on the other hand but the distance between the suction holes may not to be too small, because the grinding wheel otherwise their stability could lose and for example at the jetties between could break or tear the suction holes.

It It is therefore an object of the present invention to provide a grinding wheel to provide, with the best possible compromise between the above effects can be achieved. Especially should therefore be as high and uniform Extraction can take place, and largely independent from the hole pattern of the sanding plate used and from the relative Rotary position between grinding wheel and sanding disc.

Disclosure of the invention

Advantages of the invention

These and other objects are achieved by a circular grinding wheel with a center and a plurality of particular circular suction holes. The grinding wheel may have in its center a particular circular attachment opening. In this case, the center is to be understood only as an imaginary reference point, from which the geometric arrangement of the suction holes described below is defined. In any case, under the center of the grinding wheel ge understood ometric center of the circular circumference of the grinding wheel.

Each Suction hole is assigned its own center. This center is also an imaginary reference point of the grinding wheel, which corresponds to the geometric center of gravity of the suction hole. For example, if the suction hole is circular, it is true its center coincides with the geometric center of the circle, which forms the edge of the suction hole.

Of the Center of each suction hole defines one hand from the center of the grinding wheel emanating beam on which the Center of the suction hole is located. On the other hand, the center of the Suction hole has a bolt circle concentric with the center of the Grinding wheel runs and on the the center of the Suction hole is located. The center of the suction hole is then So on the intersection of the beam with the bolt circle.

According to the invention the arrangement of the suction holes by the following characteristics Characterized: First, at least one of the rays emanating from the center only the center of a single one Suction hole arranged. Such a ray is here and in the following referred to as a single hole.

Farther should be the centers of all suction holes on one Einlochstrahl are arranged, essentially on a common One-hole circle with the same radius lie. You therefore have all substantially the same distance from the center of the grinding wheel. The wording "essentially" means that the distances of the centers of the suction surface from the center of the grinding wheel at most by half Diameter of the individual suction holes differ from each other. The above property does not exclude that on the Single-hole circle are also the centers of suction holes, which are not arranged on a Einlochstrahl. At least one but the suction holes on the single-hole circle must be at the same time lie on a Einlochstrahl.

After all each beam should be at the center of a radius at least one radius Have suction holes, at which radius the two in the circumferential direction No ray center of a ray adjacent to this ray Have suction hole.

The Combination of these features leads to a particularly good Compromise between exhaust performance and uniformity, Independence from the hole pattern of the sanding plate and the Positioning and stability of the Schleibeibe. The order the suction holes, both on a single-hole as also lie on the one-hole circle, for example, ensures the suction holes are circumferentially offset from each other. As a result, a relatively uniform arrangement the suction holes reached without the suction holes Too close to each other for stability reduce the grinding wheel. In addition, has become shown that by such a hole pattern, the removal rate (that is, the amount of a machined surface in the Grinding abraded material per time) significantly increased can be. In addition, many experiments have found that the roughness of the machined surface is practical remained unchanged.

In preferred embodiments, the number of circles, whose radius is smaller than the radius of the one-hole circle, in the area from 2 to 5. In other words, the one-hole circle is the third smallest, fourth-smallest, fifth-smallest or sixth-smallest radius, are arranged on the suction holes. Preferably, the Number of circles whose radius is smaller than the radius of the one-hole circle, 3 or 4. The more hole circles within the one-hole circle, the further out is the single-hole circle. In these further outside areas of the grinding surface is the angle offset described above particularly favorable.

Everyone Beam having at least one center of a suction hole, can be assigned to a jet type. By definition, this type of jet gives the Totality of radii at which on this ray the center a suction hole is arranged. For example, could a jet type characterized in that a first hole at the smallest radius, a second hole at the third smallest radius and a third hole at the fifth smallest radius.

The grinding wheel preferably has at most 5, preferably at most 4, more preferably at most 3, particularly preferably exactly 3 different types of jet. One of these beam types is always the beam type of single-hole beams. Since, according to the invention, the centers of all the suction holes arranged on a single-hole jet lie substantially on a common single-hole circle, the grinding disk contains only a single single-hole jet type. The other types of jet contained as a result of the invention Features always at least the centers of two suction holes.

Prefers are at most 6 on each beam, preferably at most 4, more preferably at most 3 centers of suction holes arranged. This can ensure that the Distances of the suction holes from each other big enough are to ensure the stability of the grinding wheel.

Also preferred are on any beam that is not a single hole, the Center of at least 3 suction holes arranged. In other words, there are no ray types that are exactly two Extraction holes included. This leads to the grinding wheel contains enough suction holes.

It has proved beneficial when the number of all suction holes in the range of 20 to 100, preferably from 30 to 80, particularly preferred from 40 to 64 lies. This provides a good compromise between one high and uniform suction and simultaneous Stability of the grinding wheel.

The Number of rays, the at least one center of a suction hole contained, is advantageously in the range of 10 to 50, preferably between 20 and 30 and is particularly preferred 24. A smaller one Number of rays would accumulate the suction holes in certain areas of the grinding wheel mean something to one uneven suction would result. A larger number of rays would lead to a high density of the suction openings, which would reduce the stability of the grinding wheel.

Also Preferably, the number of bolt circles, on which the center is arranged at least one suction hole, in the range of 3 to 10, preferably from 4 to 8, more preferably from 4 to 6. A too small a number of bolt circles would lead to an uneven Extracting lead along the radial direction. One too large number, however, would cause a loss of stability in the radial direction.

Prefers the radii of the hole circles are substantially uniform over distributed the radius of the entire grinding wheel. The smallest radius A lock circle can be between 15% and 35%, preferably between 20% and 30% of the radius of the grinding wheel. The biggest Radius of a lock circle can be between 70% and 90%, preferably between 75% and 85% of the radius of the grinding wheel. For characterization the uniform distribution of the radii can be the mean absolute deviation of the radial distances respectively two adjacent hole circles are used. This is preferred mean absolute deviation less than 30%, preferably less as 15% of the mean radial distance between two adjacent hole circles.

The average number of suction holes, their centers lying on a beam is preferably in the range of 1.2 to 3, preferably from 1.4 to 2.85, more preferably from 1.6 to 2.7. A smaller average number would become one uneven suction along the radial Lead direction, while a larger one average number the stability of the grinding wheel would reduce.

Also preferably the average number of suction holes is preferred, whose centers lie on a circle of holes, in the range of 6 to 20, preferably from 8 to 15, particularly preferably from 10 to 12.5. A smaller average number would become one uneven suction along the circumferential direction lead while a larger one average number the stability of the grinding wheel would reduce.

As explained above, the ratio of the total area of all suction holes to the total surface of the grinding wheel determines, on the one hand, the effect of the suction and, on the other hand, the stability of the grinding wheel. Advantageously, this ratio is in the range from 2% to 20%, preferably from 6% to 12%, more preferably from 4% to 7%. The total area of the grinding wheel includes both the actual grinding surface on which the abrasive grains are applied and the total area of all the suction holes. If the grinding wheel has a central attachment opening, however, its area is not added to the total area of the grinding wheel. Thus, if the grinding wheel has a diameter D and if it has a central, circular attachment opening with a diameter b, then the total area of the grinding wheel is calculated by π 4 (D 2 - b 2 ).

In advantageous embodiments, at least 80%, preferably at least 90%, particularly preferably all suction holes are circular and have a diameter ranging from 3 mm to 6 mm, preferably from 3.5 mm to 4.5 mm, more preferably from 4 mm to 5 mm. With such diameters, a particularly good suction could be achieved.

Prefers are on each bolt circle the centers of at least 8 suction holes arranged, preferably from exactly 8 suction holes or exactly 16 suction holes.

advantageously, are the suction holes in the circumferential direction on each bolt circle evenly arranged. Contains a bolt circle For example, 8 suction holes, so are two on the bolt circle arranged and circumferentially adjacent suction holes arranged at an angular distance of 45 ° to each other.

It is advantageous if the arrangement of the suction holes is not substantially translucent symmetrical. An arrangement is referred to as translationally symmetric if it is converted into itself by a linear displacement. The phrase "substantially" means that the arrangement can not be completely converted into itself due to the finite number of suction holes in the peripheral areas of the grinding wheel due to such a translation. Substantially translationally symmetric arrangements of the suction holes are, for example, the arrangement at the vertices of a square lattice (as in FIG EP 781 629 A1 ) or at the vertices of a triangular grid (as in WO 2008/042775 A1 ).

The Grinding wheel may contain any known per se, for example Paper or vulcanized fiber. The suction holes can be generated for example by punching in the documents. The abrasive grain may be any known per se, for example alumina, Silicon carbide or silicon nitride. The abrasive grains can be conventional Have grain sizes, z. P80, P180, P240 or P400. The abrasive grain can with a likewise known per se Binder be fixed on the pad.

alternative or in addition to a central attachment opening The grinding wheel on its back (i.e. the side facing away from the abrasive grain) further fastening means have for attachment to a sanding plate. For example this can be loops and / or hooks of a loop-hook connection act, so a Velcro connection. It is also conceivable that the attachment means of a coating with a pressure-sensitive adhesive be formed.

The following Table 1 gives particularly preferred combinations of parameters describing the arrangement of the suction holes: parameter 1 2 3 4 5 6 Diameter of the grinding wheel in mm 150 150 150 125 150 150 Diameter of the suction holes in mm 4 4.5 5 4.5 4 4.5 Number of suction holes 56 56 56 40 64 64 Number of hole circles 5 5 5 4 6 6 Number of suction holes on the hole circles 8th 8th 8th 8th 8th 8th 8th 8th 8th 8th 8th 8th 16 16 16 16 8th 8th 8th 8th 8th 8th 16 16 16 16 16 8th 8th 16 16 Number of bolt circles whose radius is smaller than the radius of the one-hole circle 3 3 3 3 4 4 Number of jet types 3 3 3 3 3 3 Number of suction holes on the jet types 1; 1; 3 1; 1; 3 1; 1; 3 1; 1; 3 1; 3; 4 1; 3; 4 Table 1

Description of the drawings

in the The invention is based on six concrete embodiments and Figures explained in more detail, the above variants embody. Showing:

1 a first embodiment of an inventive grinding wheel with 56 suction holes with a diameter of 4 mm;

2 a second embodiment of an inventive grinding wheel with 56 suction holes with a diameter of 4.5 mm;

3 a third embodiment of an inventive grinding wheel with 56 suction holes with a diameter of 5 mm;

4 a fourth embodiment of an inventive grinding wheel with 40 suction holes with a diameter of 4.5 mm;

5 a fifth embodiment of an inventive grinding wheel with 64 suction holes with a diameter of 4 mm;

6 : A sixth embodiment of an inventive grinding wheel with 64 suction holes with a diameter of 4.5 mm.

Description of the embodiments

In the 1 illustrated first embodiment shows a circular grinding wheel 1 with diameter D = 150 mm. In the center of the grinding wheel 1 is a circular mounting hole 3 arranged with a diameter of b = 16 mm, by means of which the grinding wheel 1 in a known per se with a grinding pad, not shown here is connectable. The grinding wheel 1 contains an imaginary center M, which is the geometric center of the circular outer circumference 4 the grinding wheel 1 represents.

The grinding wheel 1 contains a total of n _L = 56 circular suction holes 2 with a diameter of 4 mm. The center of each suction hole 2 is on one of n _S = 24 emanating from the center M rays as well as on one of n _K = 5 hole circles K ₁ , ..., K ₅ with associated radii r ₁ = 18.5 mm, r ₂ = 27.5 mm, r ₃ = 40 mm, r ₄ = 50 mm and r ₅ = 60 mm arranged. The center points of n _L1 = 8, n _L2 = 8, n _L3 = 16, n _L4 = 8 and n _L5 = 16 exhaust holes are on the hole circles K ₁ , ..., K ₅ 2 arranged. On each of the bolt circles K ₁ , ..., K5 are the suction holes 2 each arranged uniformly in the circumferential direction: on the hole circles K ₁ , K ₂ and K ₄ are the suction holes 2 so arranged at an angular distance of 45 ° from each other while the suction holes 2 are arranged on the pitch circles K ₃ and K ₅ at an angular distance of 22.5 ° from each other.

The eight beams S ₂ , S ₅ , S ₈ , S ₁₁ , S ₁₄ , S ₁₇ , S ₂₀ and S ₂₃ each contain only the center of a single suction hole 2 , These rays are therefore called single-hole beams. The total of 8 suction holes 2 on the single-hole beams are all on the same bolt circle K ₄ and consequently all have the same distance from the center M of the grinding wheel 1 , The bolt circle K ₄ is therefore referred to as a single-hole circle. The three bolt circles K ₁ , K ₂ and K ₃ thus have smaller radii than the one-hole K ₄ .

Again 1 It can also be seen that each jet S ₁ ,..., S _{24 has} the center of a suction hole at at least one radius 2 on, at which radius the two beams adjacent in the circumferential direction to this jet no center of a suction hole 2 exhibit. For example, the jet S ₁ at the radius R _{2 contains} the center of a suction hole 2 , which therefore lies on the bolt circle K ₂ . The circumferentially adjacent beams S ₂ and S ₂₄ , however, do not contain a suction hole at this distance r ₂ 2 , The jet S ₂ contains at the radius r ₄ the center of a suction hole 2 However, the circumferentially adjacent beams S ₁ and S ₃ not. This causes the suction holes 2 are angularly offset to each other. This is the suction holes 2 on the one hand arranged relatively uniform and allow a relatively uniform suction. On the other hand, the distances between the suction holes 2 big enough to tear or break the bars between adjacent suction holes 2 to prevent.

The grinding wheel 1 contains exactly three types of jet T ₁ , T ₂ and T ₃ : The jet type T ₁ contains only a single suction hole 2 at the radius r ₄ and therefore forms a single hole. The jet type T ₂ contains at the radii r ₂ , r ₃ and r ₅ a suction hole 2 while the jet type T ₃ at the radii r ₁ , r ₃ and r ₅ a suction hole 2 contains. Each of the beams S ₁ , S ₂ , ... or each of the beam types T ₁ , T ₂ , T ₃ thus contains either exactly one or exactly three centers of suction holes 2 , The beam types are arranged in the circumferential direction U in the order T ₂ , T ₁ , T ₃ , this sequence being repeated eight times over the entire angular range of 360 °. The angle between T ₂ and T ₁ and between T ₂ and T ₁ is 11.25 °, while between T ₁ and T ₃ is 22.5 °. The arrangement of the suction holes 2 turns into rotation about the center M by 45 ° in itself, so has an eight-fold symmetry.

In the 1 illustrated grinding wheel 1 has a total area A = π 4 [(150 mm) 2 - (16 mm) 2 ] ≈ 17470 mm 2 ,

Each of the suction holes 2 has an area of a = π 4 (4mm) 2 ≈ 12.57 mm 2 ,

Thus, the ratio of the total area of all suction holes 2 to the total area A of the grinding wheel 1 approximately

The mean distance between two adjacent hole circles in 1 is 10.375 mm. The mean absolute deviation from this mean distance is 1.0625 mm. Consequently, the mean absolute deviation is about 10% of the mean radial distance.

The 2 and 3 show a second and third embodiment, the first embodiment only by the diameter of the suction holes 2 distinguish: In the second embodiment according to 2 is this diameter d = 4.5 mm, while in the in 3 shown third embodiment d = 5 mm.

This in 4 illustrated fourth embodiment is a further modification of the in 2 shown. In contrast to 2 has the grinding wheel 1 of the 4 a diameter of D = 125 mm, and the diameter of the central attachment opening is 12 mm. Moreover, it has only four bolt circles K ₁ , ..., K ₄ , whose arrangement and radii to those in 2 equivalent. In the 4 shown grinding wheel 1 does not contain a fifth circle of holes.

The 5 and 6 show further embodiments, each with 6 bolt circles K ₁ , K ₆ and associated radii r ₁ , ..., r. ₆ The numbers of holes on the pitch circles in this embodiment are n _L1 = n _L2 = n _L3 = n _L5 = 8 and n _L5 = n _L6 = 16. Also in the 5 and 6 illustrated grinding wheels 1 have _S = 24 rays belonging to three types of steel T ₁ , T ₂ , T ₃ : The jet type T ₁ contains only a single suction hole 2 at the radius r ₅ and therefore forms a single-hole beam. The jet type T ₂ contains at the radii r ₂ , r ₄ and r ₆ a suction hole 2 while the jet type T ₃ at the radii r ₁ , r ₃ , r ₄ and r ₆ a suction hole 2 contains. Each of the beams S ₁ , S ₂ , ... or each of the beam types T ₁ , T ₂ , T ₃ thus contains exactly one, exactly three or exactly four centers of suction holes 2 , The beam types are arranged in the circumferential direction U in the order T ₂ , T ₁ , T ₃ , this sequence being repeated eight times over the entire angular range of 360 °. The angle between T ₂ and T ₁ and between T ₂ and T ₁ is 11.25 °, while between T ₁ and T ₃ is 22.5 °. The arrangement of the suction holes 2 turns into rotation about the center M by 45 ° in itself, so has an eight-fold symmetry.

The following table 2 summarizes the parameters for the embodiments described above: parameter Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Diameter D of the grinding wheel 1 in mm 150 150 150 125 150 150 Diameter of the central mounting hole in mm 16 16 16 12 16 16 Total area A of the grinding wheel 1 in mm ² 17470 17470 17470 12158 17470 17470 Diameter d of the suction holes 2 in mm 4 4.5 5 4.5 4 4.5 Diameter of the central mounting hole 3 in mm 16 16 16 12 16 16 Number n _L of suction holes 2 56 56 56 40 64 64 Number n _{K of} the bolt circles 5 5 5 4 6 6 Radii r ₁ , r ₂ , ... the hole circles in mm 18.5 18.5 18.5 18.5 17.5 17.5 27.5 27.5 27.5 27.5 25 25 40 40 40 40 28.75 28.75 50 50 50 50 40 40 60 60 60 50 50 60 60 Numbers n _K1 , n _K2 , ... of the suction holes 2 on the hole circles 8th 8th 8th 8th 8th 8th 8th 8th 8th 8th 8th 8th 16 16 16 16 8th 8th 8th 8th 8th 8th 16 16 16 16 16 8th 8th 16 16 Radius r _{i of} the single-hole circle in mm 50 50 50 50 50 50 Number of bolt circles whose radius is smaller than the radius of the one-hole circle 3 3 3 3 4 4 Number n _S of rays 24 24 24 24 24 24 Number of jet types 3 3 3 3 3 3 Number of suction holes 2 on the jet types 1; 1; 3 1; 1; 3 1; 1; 3 1; 1; 3 1; 3; 4 1; 3; 4 average number of suction holes 2 per bolt circle n _L / n _K 11,20 11,20 11,20 10.00 10.67 10.67 average number of suction holes 2 per beam n _L / n _S 2.33 2.33 2.33 1.67 2.67 2.67 Ratio of the total area of all suction holes 2 to the total area (A) of the grinding wheel 1 4.0% 5.1% 6.3% 5.2% 4.6% 5.8% Table 2

The grinding wheels according to the invention allow an efficient Removal of sanding dust. The service life of the grinding wheel can This significantly prolongs the grinding wheels consumed less quickly and therefore less frequently replaced have to.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 1977858 A1 [0004]
• - WO 2008/042775 A1 [0004, 0031]
• - EP 781629 A1 [0004, 0031]

Claims (15)

Circular grinding wheel ( 1 ) having a center (M), containing a plurality of in particular circular suction holes ( 2 ), the center of each suction hole ( 2 ) at the intersection of one of the center (M) of the grinding wheel ( 1 ) outgoing beam (S ₁ , S ₂ , ...) with a concentric with the center (M) arranged bolt circle (K ₁ , K ₂ , ...) with radius (r ₁ , r ₂ , ...) is arranged , characterized in that - at least one of the beams (S ₁ , S ₂ , ...) is a single-hole jet (S _i1 , S _i2 , ...) on which the center of only one suction hole ( 2 ) is arranged; - the centers of all suction holes ( 2 ), which are arranged on a single-hole beam (S _i1 , S _i2 ,...), essentially lie on a common single-hole circle (K _i ) with radius (r _i ); Each jet (S _j ) at least one radius (r _j ) the center of a suction hole ( 2 ), at which radius (r _j ) the two beams (S _j-1 , S _{j + 1} ) which are adjacent in the circumferential direction to this beam (S _j ) do not have a center point of a suction hole ( 2 ) exhibit. Grinding wheel ( 1 ) according to claim 1, characterized in that the number of hole circles (K ₁ , K ₂ , ...) whose radius (r ₁ , r ₂ , ...) is smaller than the radius (r _i ) of the single-hole circle ( K _i ) is in the range of 2 to 5 and is preferably 3 or 4. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that each beam (S ₁ , S ₂ , ...) can be assigned to a beam type (T ₁ , T ₂ , ...) which determines the quantity of radii (r ₁ , r ₂ , ...) indicates at which on this jet (S ₁ , S ₂ , ...) the center of a suction hole ( 2 ), wherein the grinding wheel ( 1 ) at most 5, preferably at most 4, more preferably at most 3, particularly preferably exactly 3 different types of jet (T ₁ , T ₂ , ...). Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that on each jet (S ₁ , S ₂ , ...) at most 6, preferably at most 4, more preferably at most 3 centers of suction holes ( 2 ) are arranged. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that on each beam (S ₁ , S ₂ , ...), which is not a single-hole jet (S _i1 , S _i2 , ...), the centers of at least 3 suction holes ( 2 ) are arranged. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that the number (n _L ) of all suction holes ( 2 ) ranges from 20 to 100, preferably from 30 to 80, more preferably from 40 to 64. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that the number (n _s ) of the jets (S ₁ , S ₂ , ...), the at least one center of a suction hole ( 2 ), ranging from 10 to 50, preferably from 20 to 30 and more preferably 24. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that the number (n _K ) of the hole circles (K ₁ , K ₂ , ...), on which the center of at least one suction hole ( 2 ) is in the range from 3 to 10, preferably from 4 to 8, more preferably from 4 to 6. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that the average of the number of suction holes, the centers of which are on a jet, in the range of 1.2 to 3, preferably from 1.4 to 2.85, particularly preferably from 1.6 to 2.7. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that the average number of suction holes, the centers of which lie on a circle of holes, in the range of 6 to 20, preferably from 8 to 15, particularly preferably from 10 to 12. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that the ratio of the total area of all suction holes ( 2 ) to the total area (A) of the grinding wheel ( 1 ) ranges from 2% to 20%, preferably from 6% to 12%, more preferably from 4% to 7%. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that at least 80%, preferably at least 90%, particularly preferably all suction holes ( 2 ) are circular and have a diameter ranging from 3 mm to 6 mm, preferably from 3.5 mm to 4.5 mm, especially preferably from 4 mm to 5 mm. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that on each bolt circle (K ₁ , K ₂ , ...) the center of at least 8 suction holes ( 2 ) are arranged, in particular of exactly 8 suction holes ( 2 ) or exactly 16 suction holes ( 2 ). Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that on each bolt circle (K ₁ , K ₂ , ...) the suction holes ( 2 ) are arranged uniformly in the circumferential direction. Grinding wheel ( 1 ) according to one of the preceding claims, characterized in that the arrangement of the suction holes ( 2 ) is not substantially translationally symmetric, the suction holes ( 2 ) are not arranged in particular at the vertices of a square grid or a triangular grid.