CN114728402B

CN114728402B - Grinding element for use in a rotary grinding or polishing tool

Info

Publication number: CN114728402B
Application number: CN202080078798.5A
Authority: CN
Inventors: 卡斯滕·拉森; 克劳斯·格罗斯·赫德
Original assignee: Flex Trim AS
Current assignee: Flex Trim AS
Priority date: 2019-09-18
Filing date: 2020-09-18
Publication date: 2024-06-04
Anticipated expiration: 2040-09-18
Also published as: EP4031327A1; WO2021052548A1; DK180350B1; CN114728402A; US20220402099A1; BR112022004866A2; DK201970574A1

Abstract

An abrasive element for use in a rotary grinding or polishing tool for grinding or polishing a surface is described, of the type comprising an elongate profile rail, a cloth and a backing brush. The abrasive cloth and the support brush are mounted in or on the profile rail such that the abrasive cloth is supported on its inactive side by the support brush. The abrasive cloth outside the profile guide rail has an abrasive cloth height in the vertical direction and an abrasive cloth length in the longitudinal direction. The support brush and the abrasive cloth have different heights from the profile rail of the support brush height and the abrasive cloth height, respectively, such that the abrasive cloth terminates in an exposed edge region that extends beyond the top of the support brush and extends a distance along the exposed end of the support brush. The exposed edge region forms an effective area of the effective side of the abrasive cloth in use.

Description

Grinding element for use in a rotary grinding or polishing tool

Technical Field

The present invention relates to an abrasive element.

Background

In the present description, which is intended for use with an abrasive or polishing tool, the terms "grinding (abrasive)" and "polishing" are interchangeable. For example, abrasive cloth (abrasive cloth) also refers to polishing cloth or the like.

Grinding elements for grinding machines or polishing machines, such as drum grinders or grinding wheels, are known. These are typically made of a combination of abrasive cloth and a supporting brush. The abrasive cloth and the support brushes are typically mounted in an elongated support profile rail, wherein the abrasive cloth and the support brushes protrude from the profile rail. Alternatively, the support brushes may be mounted in an elongated support profile rail, wherein the abrasive cloth may be placed outside the profile rail or directly on the brushes. Profile rails are commonly used to secure grinding elements in undercut grooves of tools on grinding or polishing machines.

The abrasive cloth terminates in an exposed edge region which extends beyond the top of the support brush and along the upper end portion of the support brush, the edge region forming an effective abrasive area of the abrasive cloth in use. However, this grinding zone is only a part of the entire abrasive cloth mounted in the profile rail.

Furthermore, the known abrasive elements are limited in their effectiveness because the flexibility (flexability) and pliability (pliability) of the abrasive elements perpendicular to the machine direction are determined by the pliability and pliability of the sandpaper, and the pliability and pliability of the abrasive elements are important parameters of the treated surface when abrading or polishing various workpieces.

Finally, it is well known that sandpaper in the form of sandpaper is relatively inexpensive and has a limited useful life. However, this is not a problem, as the grinding element can be replaced quickly and easily without a significant amount of downtime.

However, abrasive cloths, which are expensive in terms of materials, are also known, as are machines, for which a long service life of the grinding elements is important.

However, there is a need to reduce costs and also to provide grinding elements that allow reduced material consumption. This is especially true when handling expensive sandcloths.

US 4,969,299 discloses a rotary grinding tool with a grinding element, which comprises a sheet consisting of a cloth with bonded grinding particles. The citation does not contain instructions for using the support brush. The area of the cloth used to support the sheet remains free of abrasive particles.

Furthermore, WO2011/110176 discloses an abrasive element. Such abrasive elements have been acceptable for many years because of their history of reduced consumption of expensive abrasive materials and long service lives. However, disadvantages in the form of wear grooves appear on the surfaces of the tool treated with these abrasive elements.

Even in the case of fine-grained grinding materials, problems are encountered in some applications when finishing the treated surface. The treated surface is typically treated with some form of coating or paint.

Thus, problems are encountered in that the coating adheres to the treated surface. To solve this problem, experiments were performed using various base treatments and adhesives as a base for surface varnishes or surface coatings. The use of multiple facing layers is undesirable in view of the cost and weight that results.

The problem of surface gloss also arises. In many products this creates the problem of unwanted glare and reflection. Even if the coating is used for finishing purposes, this can create problems on the finished surface. This is due to the irregular surface of the treated surface with worn grooves of areas where glare and reflection can occur. This problem is particularly acute for fibre surfaces in public spaces such as wind turbine blades, safety helmets and photovoltaic systems. To alleviate this problem, experiments with special varnishes have been carried out. However, there is a need to keep the weight within a defined range, in particular for products such as wind turbine blades and safety helmets, i.e. to reduce the use of paints and coatings as much as possible.

Thus, several experiments have been performed on different types of finishing, including the use of adhesives and special varnishes. The application of adhesives, primers, special varnishes (possibly divided into several layers) increases costs and leads to an increase in weight, which is not desirable for some products.

Accordingly, there is a need for improved grinding/polishing to obtain a surface that will provide a better basis in the form of a treated surface, thereby minimizing the need for finishing and eliminating the problems of glare and adhesion.

Object of the Invention

The object of the present invention is to enable the use of prior art grinding elements which reduce the consumption of expensive grinding materials and have a long service life and also to achieve a uniform surface grinding, thus minimizing the problems of sticking and glare.

Disclosure of Invention

The invention achieves this object by means of a grinding element of the type mentioned in the introduction, which is characterized in that the arrayed particles of grinding material are arranged offset with respect to the particles in the adjacent rows and that the arrayed particles are spaced apart such that the grinding particles overlap in the longitudinal direction of the abrasive cloth.

Commercially available abrasive cloths are machine-made, wherein the particles of abrasive material are located in adjacent rows. When the length of the rows is viewed laterally, the rows of particles are placed such that the particles in every other row are offset from each other.

When using these commercially available abrasive cloths, the normal procedure for forming strips in the abrasive element is to cut in a direction parallel to the rows and in the spacing between adjacent rows. This makes it possible to form clean cuts without disturbing the grinding material particles, which are usually composed of diamond or a similar hard material, which are used as super-grinding material.

By this cutting, the strip of grinding elements is provided with rows of particles, which are oriented parallel to the vertical direction. This results in wear grooves with areas where there is surface grinding in the areas near the rows and little or no wear in the areas between the rows. In other words, some areas in the longitudinal direction of the abrasive cloth may occur where no abrasive particles are available for forming the surface to be machined.

The present invention solves this problem because the abrasive grains overlap in the longitudinal direction of the abrasive cloth. Thus, the particles will be arranged in the longitudinal direction of the abrasive cloth. The particles are suitably arranged in rows. Since the particles of the abrasive material are arranged in rows, a general commercially available abrasive cloth can be used. By changing the orientation of the rows such that they are no longer parallel to the vertical direction of the abrasive cloth, an overlap of abrasive particles can be formed in the longitudinal direction of the abrasive cloth.

Although it has been possible for many years in commercial sandcloths to "reverse" the orientation of the rows, so far, the desire to cut parallel to the rows has required specialized solutions to the formation of the strips.

The invention thus allows in a rather simple manner the manufacture of a cloth, wherein the arrangement of the abrasive material particles enables the entire surface covered by the cloth to be ground. Therefore, no specific wear grooves appear in the areas where no grinding is performed.

Such areas of the surface where wear does not occur are undesirable because they appear to have a smooth surface. Such a smooth surface may partly result in poor adhesion, but may also result in reflection and glare from the top of the surface.

Thus, with the abrasive element according to the invention, a rougher surface will be produced and the surface will not have smooth areas leading to glare. This greater surface roughness also creates a larger area, providing a greater surface for adhesion of the coating or varnish. Thus, the adhesion will increase.

Since the surface appears rough and there are no smooth areas, the reflection will become more diffuse. This makes it possible to control the surface and determine the possibility of glare and gloss based on the coating or varnish used only. Such varnishes may be applied in thinner layers than conventionally, in view of the adhesion created by the larger surfaces and the reduced need for more layers to reduce glare from abrasion and coated surfaces.

In particular for wind turbine blades, it is desirable to control glare from the turbine blades. Similar challenges occur in photovoltaic systems, from which glare from often very large surfaces is undesirable.

In safety helmets, glare reduction is also required for road safety reasons.

The particular arrangement of particles is offset from the particles in the adjacent rows, and the angular arrangement of the rows with respect to the extension of the bars, as a result of which the grinding/polishing is improved in a simple manner, allowing a surface to be obtained, thereby forming a better basis, minimizing the need for post-treatment, while avoiding glare problems and optimizing adhesion.

The abrasive material consists of particles placed in the active area of the abrasive cloth. This region therefore has a particularly effective grinding capacity, which increases the service life compared to conventional abrasive cloths. In a preferred embodiment, the abrasive material consists of diamond particles.

The abrasive material may comprise material elements having element sizes between 0.1 and 1000 microns. This means that at the lower end of the range the grinding materials may have the consistency of powder, whereas at the upper end of the range their unit sizes may consist of particles.

This range is typical of the grinding and polishing operation that is characteristic of the present invention.

When performing special, and in this case often more precise grinding and polishing operations, it is obvious to the person skilled in the art to go beyond this range, for example to use grinding materials with unit dimensions in the nanometer range.

The units of grinding material may vary in shape and structure. Thus, the units may be angular or circular, or the units of abrasive material may be a combination thereof. Furthermore, these units may be crystalline or amorphous.

In an alternative embodiment, the abrasive material in the form of particles is characterized in that the abrasive cloth itself has local protrusions which create a practically effective contact with the surface to be abraded.

The areas between these partial protrusions form channels that can divert the ground powder away from the surface being ground.

In addition, the protrusions and channels provide increased heat conduction.

The abrasive cloth is cut from the exposed edge regions to form strips. The abrasive cloth is typically cut perpendicular to the profile rails from the exposed edge of the abrasive cloth. In one embodiment, to form the strip, the abrasive cloth may be cut from the exposed edge of the abrasive cloth to the profile rail. Alternatively, the abrasive cloth may be cut from the exposed edge of the abrasive cloth to a position between the active area and the profile rail to form the short strips. The abrasive cloth may be cut to form strips having the same strip length or to form strips having different strip lengths.

According to another embodiment, the grinding element according to the invention is characterized in that adjacent rows are arranged at an angle other than 0 ° with respect to the vertical.

When using a cloth with particles arranged in rows, slightly changing the orientation of the rows with respect to the vertical direction of the cloth may cause the particles to overlap in the longitudinal direction of the cloth.

The angle may vary between 1 deg. and 179 deg. depending on the distance between adjacent rows.

The abrasive cloths are preferably arranged in adjacent rows at an angle of 90 ° with respect to the vertical direction of the abrasive cloths.

According to another embodiment, the grinding element according to the invention is characterized in that the adjacent rows are oriented longitudinally.

Thus, when the rows are aligned in the longitudinal direction, their orientation will be less than 90 ° relative to the vertical. This represents a particularly simple design. By arranging the particles in rows, the particle size and shape, as well as the spacing between the particles in the rows, can be changed in a relatively simple manner, thereby ensuring overlap in the longitudinal direction of the abrasive cloth.

According to a further embodiment, the grinding element according to the invention is characterized in that the extension of the particles in the row direction is greater than the spacing between adjacent rows of particles.

By using particles, the extension of which in the longitudinal direction of the row is greater than the distance between successive particles in adjacent rows, an overlap in the longitudinal direction of the cloth is obtained in a particularly simple manner. This is particularly advantageous when using a cloth, wherein the rows are aligned in the longitudinal direction of the cloth.

According to another embodiment, the grinding element according to the invention is characterized in that the grinding material is a super-grinding material, which consists of particles and a powder, such as diamond or similar material.

The abrasive material is a super abrasive material, the nature of which means that the units of abrasive material have a strength, such as a crystalline or tensile strength, which is approximately similar to that of diamond.

An example of an alternative embodiment is the cubic cell shaped super abrasive material boron nitride (cBN), which has approximately the same hardness as diamond, while having a thermal conductivity comparable to conventional abrasive materials.

In another alternative embodiment, the superabrasive material is provided with a coating, which may be a metallic coating and may be based on, for example, nickel, copper or similar coating materials.

According to another embodiment, the abrasive element according to the invention is characterized in that the active area constitutes 1/4 to 1/2 of the height of the abrasive cloth and is typically about one third of the height of the abrasive cloth.

Thus, for a typical combination of abrasive cloth and abrasive material, an effective area is obtained in practice, which has a desirable grinding effect, as well as an effect of saving material compared to abrasive cloth, which also has abrasive material in the non-effective areas of the abrasive cloth.

According to an alternative embodiment, the grinding element is characterized in that the active area has a grinding profile in the vertical direction of the abrasive cloth. This means, for example, grinding profiles with different grinding materials or grinding profiles with on/off grinding materials.

According to an alternative embodiment, the grinding element is characterized in that the active area of the grinding material and the end up to the exposed edge area comprise a smaller area of the abrasive cloth, which is not coated with the grinding material and which occupies zero to one eighth of the grinding height of the cloth.

According to another embodiment, the abrasive element according to the invention is characterized in that the height of the abrasive cloth is between 20mm and 80mm, typically about 40mm.

Thus, the abrasive element provides a suitable grinding effect for manually controlled machines and tools as well as for practical applications in machines and tools commonly used in the industry for the production of elements.

It will be apparent to those skilled in the art that the height of the abrasive cloth can be extended for larger or special grinding or polishing purposes for use in the abrasive element.

Likewise, it will be apparent to those skilled in the art that the height of the abrasive cloth of the abrasive element may be reduced for smaller or special abrasive or polishing purposes.

According to another embodiment, the grinding element according to the invention is characterized in that the grinding material is adhered to the abrasive cloth in the active area using an adhesive which adheres the particles to the abrasive cloth. If powder is also used, this powder will also be bonded to the abrasive cloth by means of an adhesive.

In this way, the active area of the grinding element is embedded directly into the abrasive cloth, which can be easily replaced in the profile rail when worn.

The abrasive cloth can then be reused, since new abrasive material can be added in the active area.

In one embodiment, the adhesive is a resin-based adhesive. In alternative embodiments, other adhesives may be used, such as varnishes, adhesives, and the like.

Furthermore, the binder may be a polyamide or a phenoxide.

According to a further embodiment, the grinding element according to the invention is characterized in that the grinding material is arranged on a second cloth, which is mounted in the active area of the abrasive cloth.

The idea is to add the abrasive material to a separate substrate, i.e. the second cloth, and to provide the effective area of the second substrate and abrasive cloth for mounting.

The mounting may be accomplished by bonding, welding, velcro Luo Nilong snaps, or a rail means.

According to a further embodiment, the grinding element according to the invention is characterized in that the flexibility of the abrasive cloth in the area between the active area and the profile rail is greater than the flexibility of the abrasive cloth in the active area.

Flexibility means flexibility and is essentially in a direction perpendicular to the longitudinal direction of the profile rail.

The flexibility of the active area of the abrasive cloth is substantially related to the layer of abrasive material in the active area of the abrasive cloth.

The flexibility of the abrasive cloth in the area between the active area and the profile rail is substantially related to the flexibility of the support layer of the abrasive cloth, which is located between the active area and the profile rail.

According to an alternative embodiment of the abrasive cloth, the inner region has at least one region of increased flexibility. In one embodiment, the area is formed as a result of the abrasive cloth in the narrow area being thinner than the rest of the area.

Furthermore, since the active area is present between the surface and the tips of the supporting brushes, this allows the active area to act on the surface, substantially parallel to the surface.

According to another embodiment, the grinding element according to the invention is characterized in that the abrasive cloth is made of a plastic material, such as Polyethylene (PE), polypropylene (PP) or polyvinyl chloride (PVC), and in that the abrasive cloth is made of a rubber material or in that the abrasive cloth is embodied as a biomaterial.

This allows the abrasive cloth to be used in the abrasive element for a long period of time or time, thus increasing its useful life compared to conventional abrasive cloths.

Drawings

The invention will now be explained in more detail with reference to the accompanying drawings, in which:

fig. 1 is a side view of a known abrasive element, showing the inactive side of a support brush and abrasive cloth,

Fig. 2 is a side view of the abrasive element of fig. 1, showing the active side of the abrasive cloth,

Fig. 3 is a perspective view of the abrasive element of fig. 1, showing the active side of the support brush and abrasive cloth,

Fig. 4 is a perspective view of the apparatus shown in fig. 1, preferably in a cross-section perpendicular to the longitudinal direction of the abrasive element used against a surface against which the support brush pushes the active area of the abrasive cloth,

Figure 5 is an image of a portion of a cloth of abrasive elements according to the invention corresponding to figure 2,

Figure 6 is an enlarged schematic view of the abrasive cloth of figure 5,

FIG. 7 is a schematic view of a surface machined with an abrasive element according to the prior art, and

Fig. 8 is a schematic view corresponding to fig. 7, in which a surface is machined with an abrasive element according to the invention.

Detailed Description

Fig. 1-4 show the basic design of a prior art grinding element 1, as disclosed in WO 2011/110176. This design shares the design of the grinding element 1 according to the invention. The difference is in the arrangement of the abrasive particles on the abrasive cloth. Therefore, the grinding element 1 according to the invention will be explained with reference to the description of known grinding elements. The novel features of the present invention will be explained in more detail with reference to fig. 5-8.

Fig. 1 shows a grinding element 1 fixed in a profile rail 2, the profile rail 2 being intended for use in a grinding or polishing tool or machine. The profile rail 2 is elongate, so that the grinding element 1 has a natural longitudinal direction 3.

A cloth 4 and a supporting brush 5 are arranged in the profile guide rail 2. The abrasive cloth 4 is provided with strips 6.

In this particular embodiment, the profile rail 2 limits the risk of the abrasive cloth 4 and the support brushes 5 being extracted from the profile rail. Within a narrow angle of the installation area of the profile rail 2 and in the vertical direction 7, the abrasive cloth 4 and the support brushes 5 rise or radiate substantially in the same vertical direction 7.

The cloth 4 ends at a cloth edge 8 on the side facing away from the profile rail 2, the distance between the cloth edge 8 and the profile rail 2 defining a cloth height 9.

The support brushes 5 terminate at a support brush end 10 on the side remote from the profile rail 2, the distance between the support brush end 10 and the profile rail 2 defining a support brush height 11.

Similarly, the abrasive cloth length 13 is defined as the extension of the abrasive cloth 4 in the longitudinal direction 3, and the support brush length 12 is defined as the extension of the support brush 5 in the longitudinal direction 3.

In the embodiment shown, the abrasive cloth 4 is realized by a plurality of strips 6, in particular embodiments the strips 6 having substantially the same length 14. However, changing the strip length 14 does not have any impediment.

In the illustrated embodiment, the support brush length 12 exceeds the abrasive cloth length 13 and each segment of the strip length 14 has a plurality of bristles.

In the embodiment shown, the cloth height 9 exceeds the support brush height 11.

As shown, the non-active side 15 of the abrasive cloth 4 faces the support brush 5.

Fig. 2 shows the same grinding element 1 as fig. 1, but from a different side, wherein in particular the active side 16 of the abrasive cloth 4 is present.

The active side 16 of the abrasive cloth 4 has an active area 17 (marked- - -) which is coated with a grinding material 18. The active area 17 is the area from the cloth edge 8 towards the exposed edge area 19 (labeled … …) of the profile rail 2 on the cloth 4. It is not important whether the height of the exposed edge region 19 is greater than the height of the active region 17. It is important that the two areas 17, 19 overlap to some extent.

In the part shown and the embodiment illustrated in the figures, the grinding material 18 is provided as a super-grinding material 20, the super-grinding material 20 being composed of diamond 21 in the form of particles 22. Also shown here is a powder 23 which may optionally be used with particles 22. Here, the grinding material 18 is arranged on a second cloth 24, the second cloth 24 being further mounted in the active area 17 of the abrasive cloth 4.

In a specific embodiment, the second cloth 24 is glued to the abrasive cloth 4.

In the embodiment shown, the grinding material 18 on the second cloth 24 is cut similarly to the strip 6.

It can be seen here that particles 22 are arranged in rows 26. In commercial sandcloths of this type, it is quite typical for the particles to be placed in adjacent rows on the cloth. The particles 22 in every other row 26 are placed adjacent to each other as seen in the longitudinal direction 3. The particles 22 in the middle row 26 are positioned offset closer to the gap. Thus, the rows 26 of particles 22 are oriented parallel to the vertical direction 7. It can also be seen that the cuts are made parallel to the vertical direction 7 in the gaps 30 between the rows 26. In these gaps 30, the particles 22 do not overlap, so that the gaps 30 in the longitudinal direction 3 of the abrasive cloth are free of grinding material. This creates grooves that are subject to wear, since they are not coated by particles 22 in the areas of surface 25 that are worn by abrasive element 1 (see fig. 3 and 4).

Fig. 3 is a perspective view of the abrasive element 1, showing the active side 16 of the support brush 5 and abrasive cloth 4.

The end 10 of the support brush rests or acts on a surface 25, which surface 25 here also interacts with the non-active side 15 of the abrasive cloth 4.

The cloth 4 has substantially an inner flexibility and an outer flexibility, wherein the outer flexibility is related to the active area 17 of the cloth 4 and the inner flexibility is related to the area between the active area 17 and the profile rail 2.

Fig. 4 is a perspective view of the abrasive element 1, preferably a cross section perpendicular to the longitudinal direction 3 of the abrasive element 1, in use, or acting with the active side 16 of the abrasive cloth 4 facing the surface 25, wherein the support brush 5 pushes the inactive side 15 of the abrasive cloth 4 such that the active area 17 of the abrasive cloth 4 acts or works on the surface 25.

Fig. 5 shows a part of a cloth 4 for an abrasive element 9 according to the invention. The arrangement shown in fig. 5 corresponds to the part in fig. 2 and thus shows a cloth 16 on which a second cloth 24 is provided and in which the grinding material 18 is provided.

The abrasive material 18 is provided in the form of particles 22, the particles 22 being arranged in rows 26. The rows 26 are arranged parallel to the longitudinal direction 3 of the cloth and thus perpendicular to the vertical direction 7 of the cloth. The ground rows have an orientation 28 of the rows at an angle 27 with respect to the vertical direction 7.

The extended length 30 of particles 22 is along the orientation 28 of the rows, and the extended length 30 is greater than the spacing 29 between particles 22 in adjacent rows 26. Furthermore, the particles are arranged offset relative to each other in the rows 26. In this way, an overlap of abrasive particles is obtained in the entire longitudinal direction 3 of the abrasive cloth, so that any area of the surface 25 being worked will be coated with particles 22 from one row 26 or the other 26.

Fig. 6 shows an enlarged cross-sectional view of the abrasive particles 22 arranged in rows 26. It also more clearly illustrates that the extended length 30 of the particles is greater than the spacing 29 between the particles 22.

In fig. 6, the particles are shown as being generally circular. Alternatively, however, the particles 22 may have a different shape.

Fig. 7 shows a surface 25 abraded with a conventional abrasive element of the type shown in fig. 1. It can be seen that the surface 25 is provided with grinding grooves or recesses 32. These grinding grooves or recesses 32 are formed in the area adjacent to each row 26 of particles 22, the particles 22 being oriented in the vertical direction 7 of the abrasive cloth in the known design.

Between the recesses 32 there are areas with flat surfaces 31. The flat surface 31 is an untreated flat surface, and the flat surface 31 appears to have no roughness. The planar surface 31 may be smooth, which makes it difficult for a varnish or other coating to adhere to the planar surface 31 of the surface 25. These flat surfaces 31 also cause unwanted reflections and glare from the incident light, since no diffuse reflection occurs at the flat surfaces 31.

Fig. 8 shows a surface 25 machined with an abrasive element according to the invention. It can be seen here that the entire top surface of surface 25 is machined from abrasive elements to form a series of adjacent abrasive grooves or recesses 32.

A generally sharp peak 33 is provided between adjacent grinding grooves or recesses 32.

By this wear, a roughness is obtained on the entire top surface of the surface 25, which increases the chance of varnish or other coating sticking. In addition, the rough surface causes diffuse reflection of the incident light. Thus, the surface 25 will largely avoid glare and reflection, as shown in fig. 8.

Experiments have been carried out on a known type of grinding element as shown in fig. 1 and a new type of grinding element as shown in fig. 5. In this case, experiments were performed with gel coats and carbon.

At a particle size of 200, it was found that the abrasive element according to the invention produced a roughness parameter (Ra) of 2.7 for gel coats and 2.5 for known systems. Similarly, for carbon and a particle size of 200, the RA using the milling element according to the invention was 2.8, measured using the known milling element was 2.4.

Furthermore, the test with a particle size of 120 showed that the RA values of the abrasive elements according to the invention were 4.4 and 3.6, respectively, which exceeded the previous values on the gel coat. Similarly, at a particle size of 120, RA measured in carbon of the grinding element according to the invention was 3.4 and 2.9, respectively, compared to the previous grinding element.

In other words, there is evidence that the roughness of particle size 120 and particle size 200 is improved. For a particle size of 120, the roughness value is thus increased by 22%.

For the user this may mean a significant improvement in adhesion and reduced reflection, as well as a significant improvement in the grinding rate and service life of the grinding element.

Claims

1. An abrasive element (1) for use in a rotary grinding or polishing tool, the abrasive element (1) being intended for grinding or polishing a surface, the abrasive element (1) comprising an elongated profile rail (2), an abrasive cloth (4) and a supporting brush (5), wherein the abrasive cloth (4) and the supporting brush (5) are mounted in the profile rail (2) or on the profile rail (2) such that the abrasive cloth (4) is supported on its non-active side (15) by the supporting brush (5) facing the supporting brush (5), wherein the abrasive cloth (4) outside the profile rail (2) has an abrasive cloth height (9) in a vertical direction (7) and an abrasive cloth length (13) in a longitudinal direction (3), wherein the supporting brush (5) and the abrasive cloth (4) have different heights from the supporting brush height (11) and the abrasive cloth height (9) of the profile rail (2), respectively, such that the abrasive cloth (4) ends in an exposed edge region (19), the exposed edge region (19) extends beyond the supporting brush height (5) by an extension beyond the supporting brush height (10) of the supporting brush (5), the exposed edge region (19) forms, in use, an active region (17) of an active side (16) of the abrasive cloth (4), wherein a grinding material (18) is applied only to the active region (17) of the abrasive cloth (4), the grinding material consisting of particles (22), wherein the abrasive cloth (4) has an exposed abrasive cloth edge (8) and is cut from a side of the abrasive cloth edge (8) remote from the profile rail in a direction parallel to the vertical direction (7) to form a strip (6), and wherein the particles (22) are arranged in adjacent rows (26), characterized in that the particles (22) of the grinding material in one of the rows (26) are arranged such that the particles (22) are offset relative to the particles (22) in an adjacent row (26), and that the particles of these adjacent rows (26) are spaced apart by a distance (29) such that the particles of grinding of two consecutive rows overlap in the longitudinal direction (3) of the abrasive cloth (4).

2. Grinding element (1) according to claim 1, characterized in that adjacent rows (26) are arranged with respect to the vertical direction (7) in an orientation (28) of the rows of angles (27) different from 0 °.

3. Grinding element (1) according to claim 1, characterized in that adjacent rows (26) are arranged in a row orientation (28) in the longitudinal direction (3).

4. Grinding element (1) according to claim 1, characterized in that the orientation (28) of the particles (22) in a row has an extension length (30), which extension length (30) is larger than the spacing (29) between particles (22) in adjacent rows (26).

5. Grinding element (1) according to claim 1, characterized in that the grinding material (18) is a super-grinding material (20), the super-grinding material (20) consisting of particles (22) of diamond (21) and powder (23).

6. Abrasive element (1) according to claim 1, characterized in that the active area (17) constitutes 1/4 to 1/2 of the height (9) of the abrasive cloth.

7. Abrasive element (1) according to claim 1, characterized in that the height (9) of the cloth (4) is between 20mm and 80 mm.

8. Grinding element (1) according to claim 1, characterized in that the grinding material (18) is adhered to the abrasive cloth (4) in the active area (17) by means of an adhesive which adheres the particles (22) to the abrasive cloth (4).

9. Grinding element (1) according to claim 1, characterized in that a second cloth (24) is mounted in the active area (17) of the abrasive cloth (4), the grinding material (18) being arranged on the second cloth (24).

10. Grinding element (1) according to claim 1, characterized in that the flexibility of the abrasive cloth (4) in the area between the active area and the profile rail is greater than the flexibility of the abrasive cloth (4) in the active area.

11. Abrasive element (1) according to claim 6, characterized in that the active area (17) constitutes one third of the height (9) of the abrasive cloth.

12. Abrasive element (1) according to claim 7, characterized in that the height (9) of the cloth (4) is 40mm.