Roughing grinding tool

Abstract

A roughing grinding tool has a supporting body and at least one abrasive circle. The supporting body includes an abrasive grain for roughing grinding. The supporting body serves to support the at least one abrasive circle and itself for roughing grinding. The roughing grinding tool is easy to produce and robust and has a high removal capacity in conjunction with a long service life.

Claims

1-18. (canceled)

19. A roughing grinding tool having a supporting body, at least one abrasive circle, and a through-opening for fastening a tool drive, wherein the supporting body comprises an abrasive grain for roughing grinding.

20. The roughing grinding tool as claimed in claim 19, wherein the supporting body forms an abrasive region that comprises the abrasive grain bonded by means of a bonding agent.

21. The roughing grinding tool as claimed in claim 19, wherein the supporting body comprises at least one supporting-body reinforcement.

22. The roughing grinding tool as claimed in claim 21, wherein said supporting-body reinforcement is arranged next to at least one of the group comprising a top side and an underside of the supporting body.

23. The roughing grinding tool as claimed in claim 21, wherein at least one supporting-body reinforcement is embedded in the abrasive region.

24. The roughing grinding tool as claimed in claim 19, wherein the supporting body has a supporting-body outside diameter D.sub.T and the at least one abrasive circle has an abrasive circle outside diameter D.sub.S, wherein:
0.1.Math.D.sub.S≤D.sub.T≤1.2.Math.D.sub.S.

25. The roughing grinding tool as claimed in claim 19, wherein the supporting body is formed in a disk-shaped manner.

26. The roughing grinding tool as claimed in claim 25, wherein the supporting body has an offset.

27. The roughing grinding tool as claimed in claim 19, wherein the at least one abrasive circle is arranged between a first supporting body and a second supporting body.

28. The roughing grinding tool as claimed in claim 19, wherein, for a number N of the at least one abrasive circle: 1≤N≤9.

29. The roughing grinding tool as claimed in claim 19, wherein a plurality of abrasive circles are arranged one on top of another, wherein a first abrasive circle is fastened to the supporting body and each further abrasive circle is fastened to an underlying abrasive circle.

30. The roughing grinding tool as claimed in claim 19, wherein a first abrasive circle is fastened to the supporting body and a second abrasive circle is fastened to the first abrasive circle.

31. The roughing grinding tool as claimed in claim 19, wherein the at least one abrasive circle forms a joining region and a working region surrounding the joining region, and the at least one abrasive circle is fastened in the joining region and is unfastened in the working region.

32. The roughing grinding tool as claimed in claim 19, wherein the at least one abrasive circle has an oriented abrasive grain.

33. The roughing grinding tool as claimed in claim 19, wherein an abrasive circle reinforcement is fastened to at least part of the surface of the at least one abrasive circle.

34. The roughing grinding tool as claimed in claim 19, wherein the at least one abrasive circle comprises a backing layer with abrasive grain arranged thereon.

35. The roughing grinding tool as claimed in claim 34, wherein the backing layer is configured as at least one of the group comprising paper, vulcanized fiber, nonwoven and backing textile.

36. The roughing grinding tool as claimed in claim 34, wherein the backing textile comprises at least one of the group comprising polyester fibers, cotton fibers and glass fibers.

37. The roughing grinding tool as claimed in claim 36, wherein the backing textile is a polyester/cotton blend.

38. The roughing grinding tool as claimed in claim 19, wherein the at least one abrasive circle is stiffened with a filling resin.

39. The roughing grinding tool as claimed in claim 21, wherein at least one of the group comprising the at least one supporting-body reinforcement and the abrasive circle reinforcement comprises at least one of the group comprising glass fibers and jute fibers.

40. The roughing grinding tool as claimed in claim 19, wherein the at least one abrasive circle forms in each case at least one abrasive layer.

41. The roughing grinding tool as claimed in claim 40, wherein the at least one abrasive layer is arranged on at least one of the group comprising a top side and an underside of the at least one abrasive circle.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0026] FIG. 1 shows a schematic sectional view of a roughing grinding tool according to a first exemplary embodiment,

[0027] FIG. 2 shows an exploded illustration of the roughing grinding tool in FIG. 1 to demonstrate the structure,

[0028] FIG. 3 shows an enlarged sectional view of a supporting body and of a first abrasive circle and an associated first abrasive circle reinforcement of the roughing grinding tool in FIG. 1,

[0029] FIG. 4 shows a schematic sectional view of a roughing grinding tool according to a second exemplary embodiment, and

[0030] FIG. 5 shows an enlarged sectional view of a supporting body and of a first abrasive circle and an associated first abrasive circle reinforcement of the roughing grinding tool in FIG. 1 or 4.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] A first exemplary embodiment is described in the following text with reference to FIGS. 1 to 3. A roughing grinding tool 1 is in the form of a roughing grinding disk and has a disk-shaped or plate-shaped supporting body 2 and an abrasive circle stack 3. The supporting body 2 and the abrasive circle stack 3 form, concentrically with a common axis M, a through-opening 5 for fastening a tool drive. The supporting body 2 forms an annular offset 6. A planar working region 7 is arranged radially outside the offset 6, while, radially on the inside of the offset 6, a joining region 8 and a clamping region 9 are arranged. Alternatively, the roughing grinding disk can be formed in a planar manner.

[0032] The abrasive circle stack 3 has a number N of abrasive circles S and associated abrasive circle reinforcements A, wherein, for the number N: 1≤N≤9, in particular 2≤N≤8, and in particular 3≤N≤7. FIG. 2 illustrates for example an abrasive circle stack 3 having four abrasive circles and four associated abrasive circle reinforcements, wherein the abrasive circles are individually denoted S.sub.1 to S.sub.4 and the associated abrasive circle reinforcements A.sub.1 to A.sub.4. Each particular abrasive circle reinforcement A.sub.1 to A.sub.4 is fastened to a rear side 10 of the respectively associated abrasive circle S.sub.1 to S.sub.4. The fastening takes place for example over the entire surface by means of a bonding agent, for example a phenol resin. Each particular abrasive circle reinforcement A.sub.1 to A.sub.4 is provided at least in the working region 7 of the respective abrasive circle S.sub.1 to S.sub.4 and fastened to the rear side 10 over its entire surface. Each particular abrasive circle reinforcement A.sub.1 to A.sub.4 is for example a fabric made of glass fibers and/or a fabric made of jute fibers.

[0033] The first abrasive circle S.sub.1 with the associated first abrasive circle reinforcement A.sub.1 is fastened to the supporting body 2 in the joining region 8. The fastening takes place in particular by adhesive bonding. For example, in the joining region 8, close to the offset 6, an encircling adhesive layer 4 is applied, by means of which the first abrasive circle S.sub.1 including the associated abrasive circle reinforcement A.sub.1 is adhesively bonded. The adhesive layer 4 is formed in particular by the bonding agent or resin used to fasten the abrasive circle reinforcement A.sub.1 to the abrasive circle S.sub.1. The second abrasive circle S.sub.2 including the associated second abrasive circle reinforcement A.sub.2 is fastened to the first abrasive circle S.sub.1 in the joining region 8. The fastening takes place in particular by adhesive bonding. For example, in a corresponding manner, in the joining region 8, close to the offset 6, an encircling adhesive layer 4 is applied, by means of which the adhesive bonding takes place. The adhesive bonding of the abrasive circle S.sub.2 to the underlying abrasive circle S.sub.1 takes place in particular with the bonding agent or resin that also serves to fasten the abrasive circle reinforcement A.sub.2 to the abrasive circle S.sub.2. In a corresponding manner, the third abrasive circle S.sub.3 with the associated third abrasive circle reinforcement A.sub.3 is fastened the second abrasive circle S.sub.2 and the fourth abrasive circle S.sub.4 with the associated fourth abrasive circle reinforcement A.sub.4 is fastened to the third abrasive circle S.sub.3. The first abrasive circle S.sub.1 with the associated abrasive circle reinforcement A.sub.1 is thus fastened to the supporting body 2, while the further abrasive circles S.sub.2 to S.sub.4 with the associated abrasive circle reinforcements A.sub.2 to A.sub.4 are fastened to the respectively underlying abrasive circle S.sub.1 to S.sub.3. The abrasive circles S.sub.2 to S.sub.4 with the associated abrasive circle reinforcements A.sub.2 to A.sub.4 are thus not directly fastened to the supporting body 2. In the working region 7, the abrasive circles S.sub.1 to S.sub.4 with the associated abrasive circle reinforcements A.sub.1 to A.sub.4 are unfastened or not joined, and rest closely on one another in an unlaminated manner.

[0034] The supporting body 2 has a supporting-body outside diameter D.sub.T and the abrasive circles S.sub.1 to S.sub.4 with the associated abrasive circle reinforcements A.sub.1 to A.sub.4 have an abrasive circle outside diameter D.sub.S, wherein preferably: 0.1.Math.D.sub.S≤D.sub.T≤1.2.Math.D.sub.S, in particular 0.5.Math.D.sub.S≤D.sub.T≤1.1.Math.D.sub.S, and in particular 0.8.Math.D.sub.S≤D.sub.T≤D.sub.S. In the exemplary embodiment according to FIG. 2, for example: D.sub.T≈D.sub.S.

[0035] The abrasive circles S.sub.1 to S.sub.4 are in the form of abrasive material on bases. The abrasive circles S.sub.1 to S.sub.4 comprise a backing layer 11, to which an oriented abrasive grain 13 is bonded by means of a bonding agent 12.

[0036] Formed on the oriented abrasive grain 13 is a top layer 14. The backing layer 11 forms the rear side 10 for fastening the respective abrasive circle reinforcement A.sub.1 to A.sub.4. The bonding agent 12 with the abrasive grain 13 and the top layer 14 forms a respective abrasive layer 17 of the abrasive circles S.sub.1 to S.sub.4. The abrasive layer 17 is arranged on a top side, facing away from the supporting body 2, of the respective abrasive circle S.sub.1 to S.sub.4. Alternatively or additionally, the abrasive layer 17 can be arranged on an underside facing the supporting body 2. Preferably, an abrasive layer 17 is arranged on a top side and on an underside, thereby allowing two-sided working.

[0037] The backing layer 11 is configured for example as paper, vulcanized fiber, nonwoven and/or as a backing textile. Preferably, a backing textile comprises polyester fibers, cotton fibers and/or glass fibers. The backing layer 11 is configured in particular as a polyester/cotton blended fabric. The bonding agent 12 is for example a synthetic resin, in particular phenol resin. The oriented abrasive grain 13 is for example a diamond abrasive grain. The abrasive grain 13 is in particular selected from diamond, cubic boron nitride (CBN), silicon carbide (SiC), natural corundum and/or synthetic corundum. The corundum is for example zircon corundum and/or aluminum oxide (Al.sub.2O.sub.3).

[0038] The supporting body 2 is configured for roughing grinding. It comprises an abrasive grain 16 bonded by means of a bonding agent 15, and supporting-body reinforcements 18 and 19. The abrasive grain 16 is for example selected from diamond, cubic boron nitride (CBN), silicon carbide (SiC), natural corundum and/or synthetic corundum. The corundum is for example zircon corundum and/or aluminum oxide (Al.sub.2O.sub.3). The outer supporting-body reinforcements 18 are arranged next to a top side 20 facing the first abrasive circle S.sub.1 and an underside 21 facing away from the abrasive circle S.sub.1, while the inner supporting-body reinforcement 19 is embedded in the supporting body 2 and interspersed with the bonding agent 15 and the abrasive grain 16. The supporting body 2 has, in the direction of the axis M, a supporting-body thickness d.sub.T with which the supporting body 2 forms a roughing grinding layer or abrasive layer 22. The supporting-body reinforcements 18, 19 are preferably in the form of a fabric. The fabric comprises in particular glass fibers and/or jute fibers.

[0039] A second exemplary embodiment of the invention is described in the following text with reference to FIG. 4. In contrast to the first exemplary embodiment, the roughing grinding tool 1 configured as a roughing grinding disk has a second supporting body 23, such that the abrasive circle stack 3 is arranged between the first supporting body 2 and the second supporting body 23. The second supporting body 23 is formed in an identical manner to the first supporting body 2. The second supporting body 23 is oriented in the same way as the first supporting body 2 and fastened in the joining region 8 to the last abrasive circle S.sub.4. The fastening takes place in particular by adhesive bonding. In addition, the abrasive circles S.sub.1 to S.sub.4 are impregnated with a filling resin 24, which stiffens the abrasive circles S.sub.1 to S.sub.4 after curing. The filling resin 24 is thus introduced additionally into the abrasive circles S.sub.1 to S.sub.4 formed from abrasive material on a base. To this end, the roughing grinding tool 1, for example after the fastening of the abrasive circles S.sub.1 to S.sub.4, is impregnated with the filling resin 24, preferably by being dipped in a bath of filling resin 24. The filling resin 24 is for example a synthetic resin, preferably phenol resin. The filling resin 24 impregnates in particular the backing layer 11 and stiffens threads contained therein. As regards the further structure, reference is made to the description of the first exemplary embodiment.

[0040] In FIG. 5, a third exemplary embodiment is described, which is also combinable with the first two embodiments. The abrasive circles S.sub.1 to S.sub.4 in this case each form two abrasive layers 17, such that each particular abrasive circle reinforcement A.sub.1 to A.sub.4 is embedded in the associated abrasive circle S.sub.1 to S.sub.4. One of the abrasive layers 17 faces the supporting body 2 or 23, while the other abrasive layer 17 faces away from the supporting body 2 or 23. This means that the abrasive layers 17 are formed on a top side and on an underside of the respective abrasive circle S.sub.1 to S.sub.4. This allows two-sided working with the roughing grinding tool 1. As regards the further structure, reference is made to the first exemplary embodiment.

[0041] The supporting body 2 or the supporting bodies 2, 23 serve(s) according to the invention to support the abrasive circle stack 3 and at the same time itself/themselves for roughing grinding. Since the abrasive circles S.sub.1 to S.sub.4 with the associated abrasive circle reinforcements A.sub.1 to A.sub.4 are not joined in the working region 7 and rest closely on one another in an unlaminated manner, targeted wear is allowed, such that abrasive grain 13 that is not worn continuously comes into grinding engagement during the grinding process. As a result of the oriented abrasive grain 13, a high removal capacity and a high level of aggressiveness are achieved, such that the roughing grinding tool 1 is usable in particular also at flat setting angles with the advantages according to the invention. The supporting body 2 itself or the supporting bodies 2, 23 themselves has/have the properties of a roughing grinding tool, in particular of a roughing grinding disk. The roughing grinding tool 1 is configured for example as a roughing grinding disk or as a roughing grinding cup wheel. If necessary, it is possible for an additional paper separating layer to be provided between an abrasive circle reinforcement and one of the adjacent abrasive circles.