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BR-112022004866-B1 - Grinding element for use in rotary grinding or polishing tools.

BR112022004866B1BR 112022004866 B1BR112022004866 B1BR 112022004866B1BR-112022004866-B1

Abstract

GRINDING ELEMENT FOR USE IN ROTARY GRINDING OR POLISHING TOOLS, AND ABRASIVE ELEMENT. A grinding element (1) is described for use in rotary grinding or polishing tools used for grinding or polishing surfaces, and of the type comprising an elongated profile rail (2), which includes an abrasive cloth (4) and support brushes (5). The abrasive cloth (4) and the support brushes (5) are mounted on or above the profile rail (2), so that the abrasive cloth (4) is supported by the support brushes (15) on its inactive side (15). The abrasive cloth outside the profile rail (2) has a height (9) in the vertical direction (7) and a length (12) in the longitudinal direction (3). The support brushes (5) and the abrasive cloth (4) have different heights, a support brush height (11) and an abrasive cloth height (9), respectively, from the profile rail (2), such that the abrasive cloth (4) is terminated by an external exposed edge area (19) that extends beyond the top of the support brushes (5) and a short distance below along the external exposed end portions (10) of the support brushes (5). The external exposed edge area (19), when used, constitutes an active area (17) of the active side (16) of the abrasive cloth (4). The cloth (...).

Inventors

  • Karsten Larsen
  • CLAUS GROTH HEDE

Assignees

  • FLEX TRIM A/S

Dates

Publication Date
20260310
Application Date
20200918
Priority Date
20190918

Claims (10)

  1. 1. Grinding element (1) for use in rotary grinding or polishing tools used for grinding or polishing surfaces and of a type comprising an elongated profile rail (2) and an abrasive cloth (4) and support brushes (5), wherein the abrasive cloth (4) and the support brushes (5) are mounted on or above said profile rail (2), such that the abrasive cloth (4) on its inactive side (15), which is facing the support brushes (5), is supported by the support brushes (5), wherein the abrasive cloth (4) outside the profile rail (2) has a height (9) of the abrasive cloth (4) in the vertical direction (7) and a cloth length (13) in the longitudinal direction (3), wherein the support brushes (5) and the abrasive cloth (4) have different heights, a support brush height (11) and an abrasive cloth height. (9), respectively, from said profile rail (2), such that the abrasive cloth (4) is terminated by an external exposed edge area (19) that extends beyond the top of the support brushes (5) as the height (9) of the abrasive cloth (4) exceeds that height (11) of the support brushes (5) and a distance below along external exposed end portions (10) of the support brushes (5), which external exposed edge area (19), when in use, forms an active area (17) of an active side (16) of the abrasive cloth (4), wherein abrasive material (18) is applied only to that active area (17) of the abrasive cloth (4), which abrasive material consists of particles (22), which abrasive cloth (4) is cut from an external exposed edge of a cloth (8) against the profile rail in a direction parallel to that vertical direction (7) so as to form strips (6), and whose particles are arranged in adjacent rows (26), characterized in that the particles (22) of the abrasive material in a row (26) are arranged with the particles displaced relative to the particles (22) in adjacent rows (26), and in that the particles in the adjacent rows (26) are separated (29), such that the abrasive particles of two consecutive rows overlap in the longitudinal direction (3) of the abrasive cloth (4).
  2. 2. Grinding element (1) according to claim 1, characterized in that the adjacent rows (26) are arranged with their orientation (28) at an angle (27) other than 0° with respect to the vertical direction (7).
  3. 3. Grinding element (1) according to claim 1, characterized in that the adjacent rows (26) are arranged with their orientation (28) in the longitudinal direction (3).
  4. 4. Grinding element (1) according to claim 1, characterized in that the particles (22) have an extension (30) in the orientation (28) of the row, which is greater than the spacing (29) between those particles (22) in the adjacent rows (26).
  5. 5. Grinding element (1) according to claim 1, characterized in that the abrasive material (18) is a super-abrasive material (20), consisting of particles (22) and a powder (23) of diamonds (21).
  6. 6. Grinding element (1) according to claim 1, characterized in that the active area (17) constitutes between 1/4 and 1/2 of the height (9) of the abrasive cloth (4).
  7. 7. Grinding element (1) according to claim 1, characterized in that the height of the abrasive cloth (9) of the abrasive cloth (4) is between 20 mm and 80 mm.
  8. 8. Grinding element (1) according to claim 1, characterized in that the abrasive material (18) is made to adhere to the abrasive cloth (4) in the active area (17) with a binder, which binds said particles (22) to the abrasive cloth (4).
  9. 9. Grinding element (1) according to claim 1, characterized in that a second cloth (24) is mounted on the active area (17) of the abrasive cloth (4), where the abrasive material (18) is provided on the second cloth (24).
  10. 10. Grinding element (1) according to claim 1, characterized in that the flexibility of the abrasive cloth (4) in an area between the active area (17) and the profile rail (2) is greater than the flexibility of the abrasive cloth (4) in the active area (17).

Description

FIELD OF THE INVENTION [001] The present invention relates to a grinding element. FUNDAMENTALS OF THE INVENTION [002] In the present description of the invention, which is intended for use in grinding or polishing tools, the terms "abrasive" and "polishing" are mutually interchangeable. For example, an abrasive cloth also refers to a polishing cloth, etc. [003] Grinding elements for use in grinding or polishing machines are designed, for example, as drum grinders or grinding wheels. These typically consist of a combination of an abrasive cloth and support brushes. The abrasive cloth and support brushes are normally mounted on an elongated support profile rail, from which the abrasive cloth and support brushes project. Alternatively, the support brushes may be mounted on an elongated support profile rail, and the abrasive cloth may be placed outside the profile rail or directly on the brushes. The profile rail is normally intended to hold the grinding element in a subcut groove in a tool on grinding or polishing machines. [004] The abrasive cloth is terminated in an exposed outer edge area that extends beyond the top of the brushes and along the upper end portions of the support brushes, which forms the active abrasive area of the abrasive cloth when in use. However, this abrasive area is only a part of the entire abrasive cloth, which is mounted on the profile rail. [005] Furthermore, known grinding elements are limited in their effect, due to the fact that their flexibility, malleability, perpendicular to the longitudinal direction, are determined by the flexibility and malleability of the sandpaper, and due to the fact that its flexibility, malleability, is an important parameter when treating surfaces, when grinding or polishing various workpieces. [006] Finally, it is known that sandpaper in the form of sandpaper is relatively ineffective and has a limited service life. However, this is not a problem, due to the fact that the grinding elements can be replaced quickly and easily without substantial downtime. [007] However, grinding cloths with a substantial material price are also known, as are machines, for which a long service life of the grinding elements is important. [008] However, it is desirable to reduce costs, and also to provide grinding elements, which allows for reduced material consumption. This is particularly the case when dealing with expensive abrasive cloths. [009] Document No. US 4,969,299 describes a rotary grinding tool with grinding elements containing tabs consisting of cloth with abrasive grains. The said citation does not contain instructions regarding the use of support brushes. An area of the cloth to support the tabs is kept free of abrasive grains. [0010] In addition, document no. WO 2011/110176 describes a grinding element. For many years, this grinding element has functioned acceptably in many applications, due to its history of low consumption of costly abrasive materials and a long service life. However, disadvantages have been found in the form of ground grooves on surfaces treated with tools using these grinding elements. [0011] Even when using fine-grained abrasive materials, problems have been encountered in various applications when finishing the treated surface. The treated surface will normally be finished with some form of coating or paint. [0012] Thus, problems were encountered with a coating adhering to the treated surface. To remedy this, experiments were conducted with various base treatments and binders as a foundation for surface varnishing or surface coating. The use of multiple finishing layers is undesirable in terms of both cost and weight. [0013] Similarly, surface gloss problems have occurred. In many products, this will create problems with unwanted shimmer and reflections. Even when using a coating for finishing purposes, this can create problems on finished surfaces. This is due to treated surfaces having an uneven surface due to ground grooves with areas where shimmer and reflection occur. This problem is particularly exacerbated for fiber surfaces in public spaces, for example, wind turbine blades, safety helmets, and photovoltaic systems. To alleviate this problem, experiments with special varnishes have been conducted. However, it is desirable to keep the weight within limits, especially with products such as wind turbine blades and safety helmets, i.e., reduce the use of paints and coatings as much as possible. [0014] Thus, several experiments were carried out with different types of finishes, including the use of special binders and varnishes. The application of binders, primers, and special varnishes, possibly in several layers, will increase costs and, in addition, causes the weight to increase, which, for several products, is undesirable. [0015] Therefore, it is desirable to improve grinding/polishing in order to obtain a surface, which will provide a better foundation in the shape of the treated surface, and thus minimize the need for fini