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KR-102962992-B1 - Grinding tool and method of manufacturing grinding tool

KR102962992B1KR 102962992 B1KR102962992 B1KR 102962992B1KR-102962992-B1

Abstract

The present invention relates to a grinding tool (1; 40; 50) capable of rotational driving around a rotation axis (R), wherein the grinding tool comprises a grinding belt (13) having a plurality of layers (L) overlapped and wound spirally around a rotation axis (R) and a grinding layer (16) on the belt side (15) facing away from the rotation axis, wherein the wound grinding belt (13) has a shape that is convexly curved with respect to the rotation axis (R) when viewed in a longitudinal section along the rotation axis (R), and the layers (L) of the grinding belt (13) are arranged to interlock with each other in a radial direction. Additionally, the present invention relates to a method for manufacturing a grinding tool (1; 40; 50).

Inventors

  • 자일러 마쿠스

Assignees

  • 루카스-에어쳇 게엠베하 운트 코. 카게

Dates

Publication Date
20260511
Application Date
20220527
Priority Date
20210531

Claims (13)

  1. A grinding tool (1; 40; 50) capable of rotational driving around a rotation axis (R), comprising a grinding belt (13) in which a plurality of layers (L) are overlapped and wound spirally around the rotation axis (R) and a grinding layer (16) is formed on the belt side (15) facing away from the rotation axis, wherein A grinding tool (1; 40; 50) characterized in that the wound grinding belt (13) has a shape that is convexly curved with respect to the axis of rotation (R) when viewed in a cross-sectional view along the axis of rotation (R), the layers (L) of the grinding belt (13) are arranged to interlock with each other in a radial direction, the grinding tool (1) is a grinding disc and has a central support (5), and the grinding belt (13) is arranged around the support (5).
  2. A grinding tool (1; 40; 50) according to claim 1, characterized in that a layer (L2...L18; L2...L7; L2) of a grinding belt (13) located radially inward with respect to a rotation axis (R) is partially covered axially by an adjacent radially outer layer (L1...L17; L1...L6; L1)) of the grinding belt (13).
  3. A grinding tool (1; 40; 50) according to claim 1 or 2, characterized in that the profile shape of the wound grinding belt (13) has at least a partially U-shape and/or at least a partially V-shape along the belt length of the grinding belt (13).
  4. A grinding tool (1) according to claim 1, wherein the grinding tool (1) has a first main tool side (2) and a second main tool side (3) facing the opposite side of the first main tool side (2), and a grinding belt (13) is positioned axially between the first main tool side (2) and the second main tool side (3) with respect to the rotation axis (R).
  5. In claim 4, the grinding tool (1) is characterized in that it is partially terminated by one stabilization layer (26, 27) on its first main tool side (2) and/or second main tool side (3), and the grinding belt (13) is fixed to one or more stabilization layers (26, 27).
  6. A grinding tool (1) characterized in that, in claim 5, one or more stabilization layers (26, 27) comprise a binder (28), and the binder (28) extends from the edge regions (31, 32) of the grinding belt (13) toward the individual stabilization layers (26, 27) to the interior of an intermediate space (35) formed between the layers (L) of the grinding belt (13).
  7. A grinding tool (1; 40; 50) according to claim 1, wherein the layers (L) of the grinding belt (13) are placed overlapping each other without being connected at least in the central grinding area (20), and the central grinding area (20) extends beyond at least 60 percent of the axial extension (B13) of the grinding belt (13) with respect to the rotation axis (R).
  8. A grinding tool (1) characterized in that, in any one of claims 5 to 7, the grinding belt (13) is fixed to the support (5) by one or more stabilization layers (26, 27).
  9. A grinding tool (1) characterized in that, in claim 1, the support body (5) is formed in a plate shape and has a first main body side (7), a second main body side (8) facing opposite to the first main body side (7), and an outer circumferential edge (9), and a grinding belt (13) is arranged around the outer circumferential edge (9).
  10. A grinding tool (1) characterized in that, in claim 9, the first end (21) of the grinding belt (13) ends at the outer circumference of the grinding tool (1), and the second end (22) of the grinding belt (13) ends at the outer circumference edge (9) of the support (5).
  11. A grinding tool (50) according to claim 1, wherein the grinding tool (50) has a multilayer winding having a grinding belt (13) and one or more additional grinding belts (51), and the grinding belt (13) and one or more additional grinding belts (51) are each wound spirally in a plurality of layers (L) that overlap each other at least partially in a multilayer manner and overlap each other around a rotation axis (R).
  12. A method for manufacturing a grinding tool (1) according to claim 1, the method having the following steps: Step of providing a belt-shaped abrasive blank (38), A step of winding the above blank (38) spirally around a rotation axis (R), The step of placing the wound blank (38) in a mold having a cylindrical wall having an inner diameter that is at least approximately equal to the outer diameter of the grinding tool (1) to be manufactured, and A method for manufacturing a grinding tool, comprising the step of compressing the wound blank (38) in one direction along the axis of rotation (R) until the blank (38) is bent.
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Description

Grinding tool and method of manufacturing grinding tool The present invention relates to a grinding tool capable of rotational driving around a rotation axis and comprising a grinding belt, wherein the grinding belt is wound spirally with a plurality of layers overlapping around the rotation axis and has a grinding layer on the belt side facing away from the rotation axis. Furthermore, the present invention relates to a method for manufacturing such a grinding tool. US 4,625,466 A discloses a grinding wheel having a grinding belt wound around a rotation axis. The grinding belt has a grinding layer facing radially outward and a foam layer facing radially inward. The grinding layer extends parallel to the rotation axis. Additionally, the grinding wheel has a support plate to which the grinding belt is attached by its peripheral edge, which is axially aligned with the rotation axis. US 2 725 693 A discloses a grinding roll comprising an emery cloth strip wound in a cylindrical shape around a small central mandrel, the grinding roll being held together by a layer of adhesive extending over at least a portion of the length of the grinding roll. The emery cloth strip is rectangular in shape and wound in a cylindrical shape with the emery surface facing outward. A circular groove is provided within the grinding roll, which extends outwardly over the circumference of the grinding roll and is recessed inward toward the central mandrel. DE 37 17 204 A1 describes a circular disc-shaped laminate made of felted fiber materials and compressed axially, which is formed of metal fibers. These layers are layers of fiber strands wound spirally. FIG. 1 is a longitudinal cross-sectional view of a grinding tool according to a first embodiment, following the line (II) shown in FIG. 3. Figure 2 is a perspective view of the grinding tool shown in Figure 1. Figure 3 is a plan view of the grinding tool shown in Figure 1. Figure 4 is a plan view of a label for a grinding tool. FIG. 5 is a plan view of a first reinforcing insert for manufacturing a grinding tool. Figure 6 is a plan view of a blank wound to manufacture a grinding tool. Figure 7 is a plan view of a circular blank for manufacturing a grinding tool. FIG. 8 is a plan view of a second reinforcing insert for manufacturing a grinding tool. Figure 9 is a plan view of a boring for manufacturing a grinding tool. FIG. 10 is a longitudinal section of a partial illustration of a grinding tool shown in FIG. 1, following the line (XX) shown in FIG. 3. FIG. 11 is a cross-sectional view of a grinding tool according to a second embodiment. FIG. 12 is a cross-sectional view of a grinding tool according to a third embodiment. FIGS. 1 to 10 illustrate a first embodiment of a grinding tool (1) according to the present invention and are described together below. The grinding tool (1) is formed as a grinding disc and is capable of rotational driving around a rotation axis (R). The grinding tool (1) has a first main tool side (2), a second main tool side (3) facing opposite to the first main tool side, and a peripheral side (4). Additionally, the grinding tool (1) has a central support section (39) arranged concentrically around the rotation axis (R) and a grinding section (6) arranged radially outside the support section (39). The support section (39) has a first main body side (7) and a second main body side (8) facing opposite to the first main body side (7). The support section (39) includes a support (5) formed into a plate shape, in particular, by compression. The support (5) is manufactured from two circular blanks (10, 11) that are stacked on top of each other, impregnated with resin, and compressed together, here only as an example. The two circular blanks (10, 11) are shown in FIG. 7 and may be fabric circular blanks. The support section (39) has a recess (41) at the center that is formed concentrically with respect to the axis of rotation (R) and has a central bore, wherein a bore ring (12) for accommodating a tool spindle of a rotary drive machine (not shown), such as a portable angle grinder, is exemplarily inserted within the central bore. In the assembled state, the grinding tool (1) is placed over the tool spindle in the manner originally known and secured to the rotary drive machine by a spindle nut (not shown). At this time, the spindle nut is supported on the first body side (7) of the support section (39) and can be received inside a recess (41) to prevent unwanted contact with the workpiece to be processed. The grinding section (6) has a grinding belt (13) arranged as a winding around the outer edge (9) of the support (5). The grinding belt (13) is spirally wound in multiple layers, exemplarily 18 layers (L1, L2, ... L18), which are placed overlapping each other around the axis of rotation (R). This creates a single-layer winding. However, it is also possible for the winding to be formed in multiple layers with such a plurality of grinding belts (13). The grinding belt (13)