HK1110265A - Abrasive product and method for the production thereof - Google Patents

Description

Abrasive and preparation method thereof

Technical Field

In general, the present invention relates to an abrasive material in which abrasive grains are embedded in a binder matrix, and in which a contact surface covered with abrasive grains is provided for abrading a workpiece.

Background

Since the initial development of such abrasives, it has been known to prepare abrasive composites of homogeneous structure. For this purpose, non-elastic adhesives were initially used, while elastically yielding adhesives (elastomeric binders) have been used for decades. One example of an abrasive composite that uses a non-elastic binder is a grindstone. An example of an abrasive composite material that employs a resiliently compliant adhesive is a dense composite material, such as in the form of a cube or other abrasive compact formed into a grinding wheel. Both porous and non-porous embodiments are known in this respect. These known abrasive blocks were in the past the entire casting practiced by the applicant's record of success, which has been demonstrated for more than 40 years.

Heretofore, due to their construction as abrasive agglomerates, these known abrasives using a resiliently compliant binder for the abrasive particles have been regularly manufactured without the need to incorporate substances in the abrasive. In contrast, for abrasives with non-elastic binders, the term "backed abrasives" in this section has been in their own category for decades.

The invention also relates in particular to an abrasive material having a non-porous, in particular non-foamed, binder corresponding to a porous, in particular foamed, binder.

Reference is made to the German Plastics Handbook (German Plastics Handbook) "Saechtling KunststoffTaschenbuch, 28^thEdition, by Karl obenbach, Verlag Hansa, p 555, fig. 4.18 ", it is clear that wherever PUR (polyurethane) is involved, and also with respect to all other foamed adhesives, a distinction is usually made between foamed and non-porous adhesives.

In this case, the non-porous PUR types which are particularly essential according to the invention belong to the group:

solid polyurethane

Cast and sprayed elastomers

Thermoplastic elastomer

Rubber composition

The elastic compliant blocks initially referred to in the prior art and the "solid" composites in the referred grouping are each particular cast elastomers, and the abrasives of the present invention also utilize particular cast elastomers.

When the adhesive is made into a foamed adhesive, a difference is generated between a material physically and mechanically foamed by applying air and a material chemically foamed by using a foaming agent.

The abrasive material with a non-porous binder according to the invention is characterized in that the targeted foaming, which is neither physical nor chemical, is carried out by a corresponding curing treatment. The aim is instead to avoid the expansion as much as possible, although in practice the formation of residual porosity can never be completely avoided. This is why, at least in abrasive products described as being specifically designed for the market, reference is best made to true and theoretical densities compared to practice.

This comparison is best illustrated by way of example with PUR for the purpose of foaming the adhesive. When reading the German handbook of plastics, reference "Saechtling Kunststoff Taschenbuch, 28^thEdition, by Karl Oberbach, Verlag Hansa, pp 554 and below, etc. ", shaped foams (30-300kg/m³) Rigid foams (30-90 kg/m)³) And open-cell foams (20-40 kg/m)³) A difference is made between them.

According to the invention, use is made of a material, in particular a material having a well-described minimum porosity, of not less than 800kg/m³PUR of density of (a).

Backings of adhesives in which the abrasive composites exhibit the characteristics of a porous, in particular foamed adhesive, are known, for example, from german patents DE 3114001a1 and DE 1907983a 1.

In summary, the present invention is particularly directed to abrasives, composites of thermosetting binders containing abrasive particles. The invention herein is with thermoset plastics, such as polyurethane, known as binders for composite abrasive particles, although rubber may also be used in the invention as a binder for the abrasive particles.

An example of a thermoplastic binder for abrasive particles in the form of plasticized collodion (colloxyline) in the german patent DD 106585a, in contrast to the thermosetting plastics used within the scope of the present invention, requires the use of a plasticizer in a roughly equal ratio of 1: 1 or 0.8: 1. It is also desirable to control the loading of the abrasive to be at least 60% by weight of the abrasive powder in the abrasive composite, with a proportion of abrasive powder in excess of 80% being incidentally considered detrimental to bonding the abrasive composite. It is particularly proposed to arrange such known abrasive composites such that the thickness of the very thin layer of abrasive material is from 10 μm to a maximum of 40 μm when measured perpendicular to the backing (backing).

It is for the sake of completeness that reference is also made to more exotic known abrasives, and therefore kneadable binders for abrasive grains are judged to be suitable for workpiece surface contours for grinding (german patent DD255903a 1).

During the technological development of abrasives as a function of the present processing speeds, for example, the rotation or oscillation operations on the side of grinding tools or grinding machines have always become faster, and homogeneous abrasives produced over decades with elastically compliant binders have become incapable of withstanding the acceleration and traction forces produced, including centrifugal forces, without particular measures, with the result that the abrasive matrix formed by the elastically compliant binder is prematurely destroyed. One of these particular measures used with grinding wheels involves sizing the abrasive coating of the solid core of the wheel to make the abrasive thinner and thinner, resulting in a relatively short useful life. For endless abrasive belts, it was considered almost half a century ago to coat an endless belt as backing with strip-shaped abrasive composites, in each case by means of a compliant foaming of polyurethane to form a matrix containing abrasive particles, whereby these are fixed to the endless belt in a separate bonded manner (see british patent GB B821929, in particular page 2, lines 3 to 7). However, the gist of the invention necessitates an unreasonably complex process in continuous production, which is why it has not been accepted in practice, since the abrasive composites and the associated detached bonds have to be blocked.

For conventional aggressive grinding, the abrasive particles are usually always bonded directly to the backing by means of a non-elastic binder such as virgin hide glue and now synthetic resin, the size of the abrasive particles being selected according to the desired result. This backing absorbs the traction and centrifugal forces that occur in the machine. In this conventional case, the abrasive particles are attached to the backing only in a single layer and protrude from the surface of the abrasive in contact with the workpiece through the abrasive projections. When these protrusions are worn out during grinding, the adhesive is immediately brought into frictional contact with the workpiece, the efficiency of grinding is significantly reduced, and the adhesive carrying the worn surface of the workpiece is damaged.

For abrasives in which the abrasive particles are uniformly arranged in a matrix of radiation-cured inelastic adhesive on a backing bonded by an adhesive, the matrix is divided into a plurality of discrete bodies of matrix leaving spaces between them, the effect of increasing the cross-section parallel to the backing in the direction of the free contact surface with the workpiece being exerted on the backing (german patent T269210221).

In other words, the smaller abrasive particle size results in better overall polishing of the wear surface in the abrasive erosion grinding abrasive portion of the abrasive particles protruding from the contact surface. In this regard, it is desirable to identify a polish that is comparable to honing or lapping that substantially no longer includes corrosive lapping but that has a reduced peak-to-valley height of the surface.

For the use of modern grinding machines, it is now common to provide abrasive nonwovens as the abrasive for polishing. From DE-T269609709 (especially claim 4) it can be seen that a plurality of abrasive particles are bonded to an open, loose fabric of organic fibers via a binder system. The polishing performed in this way produces scars on the surface to be worked, bending or breaking. Defects such as scratches and scratches on the polished surface of the workpiece are merely masked and not actually removed.

Disclosure of Invention

The invention is based on the object of providing an abrasive of the kind described in the preamble of claim 1, which is suitable as an article for rational quantity preparation, as a polishing tool on modern grinding machines, combining a long service life with a high degree of consistency in polishing quality.

This object is achieved by an abrasive material having the features of claim 1.

In the abrasive material according to the present invention, when a new contact surface covered with abrasive grains is provided, the covering skin as a binder by releasing the matrix must be exposed in the final stage of the manufacturing process, resulting in the part of the abrasive grains protruding from the original first contact surface with the workpiece. When polishing is effected, the projections of the abrasive particles are pressed completely or almost completely into the matrix, thus substantially removing the erosive abrading action on the workpiece. Loading of the wear surface of the workpiece is avoided or at least minimized, as the abrasive particles covering the matrix are worn away, the binder previously left around does not make loading contact with the wear surface of the workpiece, but rather wears like a rubber. In this arrangement, the abrasive particles are not worn as such, but rather fall off little by little from the current contact surface. This loss of abrasive particles is continuously regenerated from the depth of the matrix, and thus, the quality of polishing is consistent during polishing regardless of the consumption of the matrix. In fact, this even involves the total consumption of the matrix attached to the backing. In this arrangement, the backing ensures consistent process quality, regardless of the extent to which the matrix is consumed, even at very high process parameters, such as rotational speed, bending speed or vibration level, while only a few process steps achieve reasonable and cost-effective abrasive manufacture in accordance with the present invention.

It is also particularly emphasized that the abrasive of the invention, in combination with modern polishing machines, can achieve improvements over those hitherto possible. The product of the invention achievable with abrasive nonwovens is therefore associated with a minimal corrosive effect of the further added abrasive particles compared to abrasive nonwovens, whereby defects of the abrasive surface can now not only be concealed, but also be eliminated or at least corrected, according to the invention. It is now surprising that no further polishing is required and that subsequent chromium workpieces can be adapted for this.

By selecting the type of binder, any fillers that may be used, and the abrasive particles, the wear is substantially determined. The binder may be adjusted for processing various materials, such as brass, aluminum, or stainless steel. The abrasive of the present invention is particularly effective in polishing relatively rough workpiece surfaces. Even when the abrasive grains in the abrasive of the present invention are coarse, these surfaces can now be polished to very fine surfaces without defects.

After being overlooked for decades, all of this has been achieved against the current trend of development by resorting to elastically compliant adhesives in the matrix.

Claims 2 to 43 relate to advantageous further embodiments of the abrasive material according to the invention, and claims 44 to 49 relate to preferred apparatuses for producing the abrasive material according to the invention.

As far as the general terms are used, in the dependent claims (sub-claims), reference is made to the terms in the part generally supported by physical data and the technology generally regarded as a standardized scope.

It is particularly noteworthy that with the abrasive according to the invention, abrasive composites whose elastically compliant matrix contains a non-porous thermoset binder are now applied to a flexible shaped backing to directly form the integral composite, i.e., without the aid of a separate bond coat, whereby the continuously worn particles are displaced from the depth of the matrix during consumption of the abrasive, which application continues until the abrasive composite is completely or nearly completely worn to the flexible backing without loss of abrasive quality. In this arrangement, the resiliently compliant structure in the abrasive composite comprising the matrix and abrasive particles can, along with the flexibility of the backing, impart inherent flexibility to the completed abrasive, which can be tailored to the particular application. In addition to this, it is now possible for consumers to obtain the same abrasive, without regard to the need for the consumer to be flexible or not to wear, so that in many applications it is no longer necessary to stock many different abrasives for applications with different requirements on the flexibility of the abrasive.

Claims 2 and 3 are directed to preferred upper and lower limits for the density of the binder in the matrix and the abrasive composite, respectively.

Claims 4-8 relate to preferred selection criteria for the elastically compliant structure of the substrate with reference to elasticity (claims 4 and 5), hardness (claims 6 and 7) and ultimate elongation (claim 8) considered.

The limit values cited in claims 2 to 8 for the ranges of density (claims 2 and 3), elasticity (claims 4 and 5), hardness (claims 6 and 7) and ultimate elongation (claim 8) are determined standardised, in particular according to the german DIN (german standardization organization) standard or the worldwide available ISO (international standardization organization) standard, each relating to the following standards:

density: DIN 53479 and ISO 1183 (claims 2 and 3), respectively

Elasticity: DIN 53513 and ISO 527-2, respectively (claims 4 and 5)

Hardness: DIN 53505 and ISO 868, respectively (claims 6 and 7)

Ultimate elongation: DIN 53504 and ISO 527-1, respectively (claim 8).

Claim 9 relates to a preferred criterion when the backing of the matrix or abrasive composite is required to be flexible.

Claims 10 and 11 relate to preferred ranges for the required minimum thickness (claim 10) and maximum thickness (claim 11) of the matrix perpendicular to the backing. Currently, preferred thicknesses for use are 1000 μm, i.e. 1.0mm, and 1500 μm, i.e. 1.5 mm. In this sense, a particularly prominent application of the invention is the manufacture of abrasives as flat materials, in particular as web materials.

Claims 12 and 13 relate to preferred ranges for the ratio of the volume percentages of abrasive particles and binder of the matrix, requiring a lower limit (claim 12) and an upper limit (claim 13).

Claim 14 recites preferred particle size ranges for the abrasive particles.

Claim 15 sets out a preferred range for the shore hardness of the abrasive.

Claims 16-20 relate to preferred materials for non-porous thermosetting adhesives, the adhesives claimed in claim 21 being generally fillable in a branch (branch), while claims 22 and 23 set out specific formulations.

Claim 24 relates to specific formulations for avoiding as far as possible the foaming of the adhesive within the scope of the invention. For this purpose, claim 24 states that in particular foam inhibitors are used as additives for adhesives.

Claims 25 and 27 relate to the selection of preferred types of abrasive particles.

Claims 28 and 30 relate to preferred arrangements of abrasive particles in a matrix.

Claims 31 to 34 relate to the preferred subdivision (sub-division) of the matrix into individual matrices.

Claims 35-38 relate to preferred backing structures.

Claims 39-42 relate to preferred geometries of abrasives for various abrasive tools.

Claim 43 finally relates to a preferred configuration of the initial contact surface of the abrasive in its configuration sold before the abrasive is used in an abrasive article.

Of particular importance is the variant set forth in claim 39 wherein the abrasive of the present invention is formed as an endless belt. In this configuration, its effect on the workpiece for the same abrasive material may also vary depending on the position of the endless belt, resulting in an effect on the workpiece. For this effect, the position is particularly preferably on the contact wheel on the one hand and on the free side of the endless belt on the other hand, whereby the stiffness of the contact wheel and the belt speed can be used as influencing factors.

The invention also relates to a method for manufacturing the abrasive material according to the invention as claimed in claims 44-49.

One known method is seen in US patent US 5562745.

The invention will now be described in detail by way of specific example embodiments with reference to figures 1-3, which generally illustrate the gist of the invention.

Drawings

FIG. 1 shows a partial view of an abrasive contact surface;

FIG. 2 is a partial view on an enlarged scale relative to the white circle in FIG. 1;

fig. 3 illustrates a cross-sectional view of a portion of the same abrasive material perpendicular to the contact surface on a larger scale.

Detailed Description

In the abrasive shown in all figures, a flexible backing support 2 is bonded to a matrix 4 (dotted in figure 3), the matrix 4 containing a resiliently compliant and non-porous thermoset binder 6 such as unfoamed polyurethane, and fillers and additives, whereby abrasive particles 8 are embedded in the matrix 4 either uniformly dispersed or in layers parallel to the backing 2. In this arrangement, the binder 6 serves not only to bind the abrasive particles 8 in the matrix 4, but also to bind the matrix 4 to the backing 2, thus eliminating the need for a separate bonding layer between the matrix 4 and the backing 2.

Facing away from the side of the backing 2 formed on the substrate 4 is a free contact surface 10 parallel to the backing 2. When the abrasive is not in use, the non-scarred abrasive particles 8 protrude slightly from the contact surface 10 (not shown) that is subjected to the return force of the resiliently compliant binder 6. In use, the abrasive particles in the region of the contact surface 10 interact with a workpiece (not shown) that opposes the bounce of the resiliently compliant binder 6, pressing completely or nearly completely within the matrix 4. However, in its original condition or prior to the use of the abrasive, the abrasive particles 8 only protrude sufficiently above the contact surface to form a microstructure at the contact surface 10 with the binder 6 of the matrix 4.

In addition, the particular embodiments described are characterized by the following particular aspects:

in the entire length of the backing 2, the matrix 4 is divided into a plurality of regular hexagonal matrix bodies 4a whose surfaces defined by the hexagonal outline are oriented perpendicularly to the backing 2, so that, in spite of wear, the matrix 4 becomes retained for each backing 2 or each matrix body 4a parallel to the contact surface 10 by the same regular hexagonal cross section.

Each individual matrix body 4a protrudes beyond the backing 2 with a full-length gap 12, which has a size all the way in between and extends from the backing 2 to the area of the contact surface 10.

The voids 12 may be used for air cooling or liquid cooling of a workpiece (not shown).

As shown, the matrix bodies 4a form a uniform honeycomb structure of the matrix 4. In this arrangement, the grinding direction 16 is chosen so as to determine the direction along an imaginary line connecting two opposite corners of the matrix body 4a, these being arranged one after the other staggered with respect to one another to form a gap so as to ensure mutual support by the adjacent immobile matrix bodies 4a even when the matrix bodies 4a are passively shaken.

Regardless of the particular hexagonal configuration of the individual matrix bodies 4a shown in this case, their configuration and arrangement within the matrix 4 is selected so that the attachment of the matrix 4 to the backing 2, which is broken down into individual matrix bodies 4a, enhances the flexibility of the abrasive composite as a whole. This is a significant and unique advantage when the abrasive is an endless belt (not shown).

Test example:

test parameters are as follows:

tube tape grinder (tubestock tape grinder): flex LBR 1506 VRA, 1200 Watt

Belt length (endless belt): 40mm x 618mm

Cutting speed: 14m/s

Workpiece: stainless steel tubing, material No.1.4301,

size: 50mm 2.5mm

The operation is as follows: hand-guided machine for tubes

Preparation of the test:

the stainless steel tubing was first coarsely ground with a grinding belt particle size P80 on a centerless grinder. The average height of the approximate post-cut peak-to-valley was about Ra 2.6 microns.

The test was performed:

for stainless steel railings, the average peak-to-valley height Ra is typically defined to be 0.5 microns. This is typically achieved by applying the following particle sequence: P120-P180-P280. An abrasive belt, such as standard abrasive belt CS 310 XF (flexible cotton backing about 320 g/m)²Abrasive grain alumina, phenolic resin binder). To achieve a particular polish, the machine is run at least 3 times (particles P120-P180-P280).

For comparison, the cuff of the present invention was used in the same test configuration and the same test preparation was performed, the cuff being characterized as follows: the flexible cotton backing was about 320g/m²Polyurethane with a layer thickness of 1200 microns was used as a non-porous thermosetting binder in which the abrasive particles silicon carbide P60 were uniformly dispersed.

In only 1 run, the average peak to valley height Ra was 0.5 microns.

Claims (49)

1. An abrasive material in which abrasive particles (8) are embedded in a matrix (4), which matrix (4) contains a non-porous, in particular non-foamed, thermosetting binder (4) for the abrasive particles (8), and in which a contact surface (10) covered by the abrasive particles (8) is designed for abrading a workpiece,

it is characterized by the combination of the following features:

(a) the matrix (4) being elastically compliant to such an extent that the abrasive particles (8) covering the contact surface (10) are pressed into the matrix (4) during grinding;

(b) the abrasive particles (8) are dispersed in the matrix (4) such that consumption of the matrix (4) perpendicular to the contact surface (10) initially covered by the abrasive particles (8) releases the deeper contact surface (10) covered by the abrasive particles (8);

(c) the abrasive particles (8) being dispersed in the matrix (4) such that they are compliant to the resilience of the matrix (4) both perpendicular and parallel to the respective contact surface (10) of the abrasive;

(d) the substrate (4) is bonded to the flexible backing (2);

(e) the substrate (4) is bonded directly to its flexible backing (2) by means of an adhesive (6) contained within the substrate (4).

2. The abrasive material according to claim 1, characterized in that the binder (6) is said to be non-porous when the density of the binder (6) in the matrix (4) is not less than 70% of the specific gravity of the binder (6) substance.

3. The abrasive material according to claim 1 or 2, characterized in that the binder (6) is said to be non-porous when the density of the binder (6) in the matrix (4) is not less than 85%, preferably not less than 90% of the specific gravity of the matrix (4) substance.

4. The abrasive material according to any one of claims 1 to 3, characterized in that the binder (6) is said to be elastically compliant when the matrix (4) is not less than 35%, preferably not less than 40% elastic.

5. The abrasive material according to any of claims 1 to 4, characterized in that the binder (6) is said to be elastically compliant when the matrix (4) is not more than 55%, preferably not more than 50% elastic.

6. The abrasive material according to any of the claims 1 to 5, characterized in that the binder (6) is said to be elastically compliant when the matrix (4) has a hardness not lower than 40 Shore A, preferably not lower than 45 Shore A.

7. The abrasive material according to any one of claims 1 to 6, characterized in that the binder (6) is said to be elastically compliant when the hardness of the matrix (4) is not higher than 75 Shore A, preferably not higher than 70 Shore A.

8. The abrasive material according to any of claims 1 to 7, characterized in that the binder (6) is said to be elastically compliant when the matrix (4) has an ultimate elongation of not less than 150%, preferably not less than 170%.

9. The abrasive material according to any one of claims 1 to 8, characterized in that the backing (2) is said to be elastically compliant when the flexural rigidity of the backing (2) is not higher than 5000mN as measured by a measurement width of 15mm, a measurement pitch of 20mm and a rotation angle of 15 °.

10. The abrasive material according to any of claims 1 to 9, characterized in that the thickness of the matrix perpendicular to the backing (2) is not less than 200 μm, preferably not less than 500 μm, most preferably not less than 1000 μm.

11. The abrasive material according to any one of claims 1 to 10, characterized in that the thickness of the matrix perpendicular to the backing (2) is not higher than 2500 μm, preferably not higher than 1500 μm.

12. The abrasive material according to any of the claims 1 to 11, characterized in that the volume percentage of abrasive particles (8) is less than or equal to 80 vol.% at the most, preferably less than or equal to 60 vol.% at the ratio of the volume percentage of abrasive particles (8) to the volume percentage of the binder (6) of the matrix (4).

13. The abrasive material according to any of the claims 1 to 12, characterized in that the volume percentage of abrasive particles (8) is greater than or equal to 20 vol.% or less, preferably greater than or equal to 40 vol.% or less, in the ratio of the volume percentage of abrasive particles (8) to the volume percentage of the binder (6) of the matrix (4).

14. The abrasive material according to any one of claims 1 to 13, characterized in that the abrasive particles (8) have a size of 2 to 2000 μm, preferably 70 to 540 μm, most preferably have sizes P36, P60, P120 and P240 according to FEPA standard.

15. The abrasive material according to any one of claims 1 to 14, wherein the abrasive material has a shore hardness in the range of shore a, preferably 60 ° to 90 ° shore a.

16. The abrasive material according to any one of claims 1 to 15, characterized in that the binder (6) comprises polyurethane, preferably made of one such polyurethane.

17. The abrasive material according to any one of claims 1 to 16, characterized in that the binder (6) comprises rubber, preferably made of one such rubber.

18. The abrasive material according to any one of claims 1 to 17, characterized in that the binder (6) contains a polysulfide, preferably made of one such polysulfide.

19. The abrasive material according to any one of claims 1 to 18, characterized in that the binder (6) contains a polysulfide, preferably made of one such polysulfide.

20. The abrasive material according to any one of claims 1 to 19, characterized in that the binder (6) comprises an acrylate, preferably made of one such acrylate.

21. The abrasive material according to any one of claims 1 to 20, wherein the binder (6) is filled.

22. The abrasive material according to any of the claims 1 to 21, characterized in that the matrix (4) contains, in addition to the binder (6), at least one filler and/or at least one dye and/or at least one other additive.

23. The abrasive material according to claim 21 or 22, wherein kaolin is provided as filler.

24. Abrasive material according to claim 22 or 23, characterized in that at least one suds suppressor is provided as additive.

25. The abrasive according to any one of claims 1 to 24, characterized in that the abrasive particles (8) contain, preferably consist of, at least one silicon carbide and/or at least one silicon dioxide.

26. The abrasive according to any one of claims 1 to 25, characterized in that the abrasive particles (8) consist of at least one alumina and/or at least one alumina mixed crystal.

27. The abrasive material according to any one of claims 1 to 26, characterized in that at least a part of the abrasive particles (8) consist of at least one cemented carbide.

28. The abrasive material according to any one of claims 1 to 27, characterized in that the abrasive particles (8) disposed closest to the backing (2) rest on the backing (2).

29. The abrasive material according to any one of claims 1 to 28, characterized in that the abrasive particles (8) are homogeneously dispersed in the matrix (4).

30. The abrasive material according to any of claims 1 to 29, characterized in that the abrasive particles (8) are arranged in several layers in the matrix (4) on a backing (2).

31. The abrasive material according to any of the claims 1 to 30, characterized in that the matrix (4) comprising its abrasive particles (8) is divided into several matrix bodies (4a) dispersed on the same backing (2) and spaced from each other, said matrix bodies (4a) preferably having a uniform cross section in a direction perpendicular to the initial contact surface (10) or backing (2).

32. The abrasive material according to claim 31, wherein the matrix bodies (4a) have a polygonal cross-section parallel to the backing (2) and are preferably staggered with respect to each other in the grinding direction (16).

33. The abrasive material according to claim 32, characterized in that the polygonal cross-section is hexagonal and preferably oriented with two angles in the grinding direction (16) or two angles in a direction opposite to the grinding direction (16).

34. The abrasive material according to claim 31, wherein the matrix bodies (4a) have a circular cross section parallel to the backing (2) and are preferably staggered with respect to each other in the grinding direction (16).

35. The abrasive material according to any of claims 1 to 34, characterized in that the backing (2) consists of a woven fabric, a knitted fabric, a film, a layer of filaments and/or one or more irregular layers of fibers, such as paper, fibers or non-woven.

36. The abrasive material according to claim 35, characterized in that the backing (2) consists of natural or artificial fibers, and/or mixtures thereof.

37. The abrasive material according to any one of claims 1 to 36, wherein the backing (2) is inherently elastically compliant.

38. The abrasive according to any one of claims 1 to 37, characterized in that the backing (2) has a quality finish.

39. The abrasive material according to any one of claims 1 to 38, wherein the abrasive structure is an endless belt.

40. Abrasive material according to any one of claims 1-39, characterized in that the abrasive material structure is a flat material, preferably a bar for an oscillating actuator.

41. Abrasive material according to any one of claims 1 to 38, characterized in that the abrasive structure is a disc or bow for an oscillating drive.

42. The abrasive material according to any one of claims 1 to 38, wherein the abrasive structure is a disc for a rotary drive, a segmented abrasive disc, a laminated abrasive point or wheel.

43. The abrasive material according to any one of claims 1 to 42, wherein the initial contact surface (10) forms a pattern at most on a microscopic scale.

44. A method for the production of the abrasive according to any one of claims 1 to 43, characterized in that the abrasive particles (8) are first mixed into a matrix (4) with a binder (6) that is still of low viscosity and this mixture is then applied to the backing (2).

45. A method for the production of the abrasive material according to any one of claims 1 to 43, characterized in that the binder (6), which is still low in viscosity, is first applied to the matrix (4) on the backing (2) and then to the abrasive particles (8) so that the abrasive particles (8) sink into the backing (2) while the binder (6) is still low in viscosity.

46. The method according to claim 45, characterized in that the abrasive particles (8) are dispersed in the matrix (4) while the binder (6) is still of low viscosity.

47. The method according to claim 45, characterized in that the abrasive particles (8) are applied in several ways to the matrix (4) previously applied to the backing (2) in its entirety, while the binder (6) is still of low viscosity.

48. A method according to any one of claims 44 to 47, characterised in that the matrix (4) containing the binder (6) and the abrasive particles (8) are applied to the backing (2) together or separately in a multilayer coating process.

49. A method of manufacturing an abrasive material according to any one of claims 31 to 34, in particular according to any one of claims 44 to 48, wherein a masking technique is used when the matrix bodies (4a) are arranged on the backing (2) in a spaced-apart relationship.