Abrasive flap disc

Abstract

An abrasive flap disc having improved properties with respect to production and grinding behavior combines an abrasive grit having a special grit mixture having 25% to 75% (high-performance ceramic) zirconium dioxide and of 25% to 75% aluminum oxide and a number of abrasive lamellae per abrasive flap disc in the range between 30 and 46.

Claims

1. An abrasive flap disc comprising: a carrier plate and abrasive lamellae which are arranged on the carrier plate around a central opening, and are made of an abrasive fabric comprising a base fabric and abrasive grit applied to the base fabric, a diameter of the abrasive flap disc being in a range of between 110 mm and 130 mm and the abrasive lamellae having a rectangular shape, wherein the abrasive grit is a grit mixture, wherein the grit mixture of the abrasive grit comprises 70% to 75% zirconium dioxide and of 25% to 30% aluminum oxide based on a total amount of the grit mixture, the number of the abrasive lamellae is between 30 and 46, and the abrasive lamellae have a width in a range between 24 mm and 30 mm.

2. The abrasive flap disc according to claim 1, wherein the number of the abrasive lamellae is between 34 and 44.

3. The abrasive flap disc according to claim 1, wherein the number of the abrasive lamellae is 44.

4. The abrasive flap disc according to claim 1, wherein the base fabric comprises polyester.

5. The abrasive flap disc according to claim 1, wherein the abrasive fabric has at least one from the group consisting of calcium carbonate as a filler and phenol resin as a binder.

6. The abrasive flap disc according to claim 1, wherein the abrasive lamellae are arranged at an angle (α) in a range between 3° and 13° to a support surface of the carrier plate.

7. The abrasive flap disc according to claim 1, wherein the abrasive lamellae are arranged at an angle (α) in a range between 9° and 12° to a support surface of the carrier plate.

8. The abrasive flap disc according to claim 1, wherein the diameter of the abrasive flap disk is 115 mm.

9. The abrasive flap disc according to claim 1, wherein the diameter of the abrasive flap disc is 125 mm.

10. The abrasive flap disc according to claim 1, wherein the abrasive lamellae have a length in a range between 19 mm and 26 mm.

11. The abrasive flap disc according to claim 1, wherein the grit mixture is 25% to 70% of a total mass of the abrasive fabric.

12. The abrasive flap disc according to claim 1, wherein a mass proportion of the zirconium dioxide in the abrasive fabric is 20% to 50% of a total mass of the abrasive fabric.

13. The abrasive flap disc according to claim 1, wherein a mass proportion of the zirconium dioxide in the abrasive fabric is 25% to 35% of a total mass of the abrasive fabric.

14. The abrasive flap disc according to claim 1, wherein a mass proportion of the zirconium dioxide in the abrasive fabric is 30% to 32% of a total mass of the abrasive fabric.

15. The abrasive flap disc according to claim 1, wherein a mass proportion of the aluminum oxide in the abrasive fabric is 6% to 20% of a total mass of the abrasive fabric.

16. The abrasive flap disc according to claim 1, wherein a mass proportion of the aluminum oxide in the abrasive fabric is 6% to 15% of a total mass of the abrasive fabric.

17. The abrasive flap disc according to claim 1, wherein a mass proportion of the aluminum oxide in the abrasive fabric is 7% to 10% of a total mass of the abrasive fabric.

18. The abrasive flap disc according to claim 1, wherein the grit mixture comprises grains having an average grain diameter of 425 μm, 348 μm or 265 μm.

19. The abrasive flap disc according to claim 1, wherein the base fabric comprises a mixture of polyester and cotton.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be explained in greater detail hereafter on the basis of an exemplary embodiment indicated in the figures. In the schematic figures

(2) FIG. 1 shows a top view of the front side or grinding side, respectively, of an abrasive flap disc;

(3) FIG. 2 shows a lateral sectional view along line I-I from FIG. 1; and

(4) FIG. 3 shows an individual abrasive lamellae in a top view.

DETAILED DESCRIPTION

(5) Essential elements of the abrasive flap disc 1 are a carrier plate 2 in the form of a circular disk having a central opening 3 and abrasive lamellae 4 arranged on the grinding side of the abrasive flap disc 1 on the outer side of the carrier plate 2. Each abrasive lamellae 4 has a rectangular shape. One surface of the abrasive lamellae is provided with abrasive grid. The other surface is connected to the carrier plate 2, for example, via glued bonds, overlapping one another in the form of a fan and circularly around the passage opening 3 peripherally to the outer edge of the carrier plate 2. The arrangement of rectangular abrasive lamellae 4 leads to a good overlapping at the outer circumference of the abrasive flap disc 1 and little overlapping at the inner area of the abrasive flap disc 1. The abrasive flap disc has an outer diameter D of 125 mm.

(6) The abrasive flap disc 1 can also have indentations for accommodating a fastening nut, in particular in the region of the central opening 3, fastening means, for example, a thread or other such features which are used in such a abrasive flap discs in the prior art and go beyond the basic structure indicated in FIG. 1. The central opening 3 is designed receive a driving shaft of a driving machine and a fastening disc on the driving shaft (not shown).

(7) Furthermore, further details on the construction of the abrasive flap disc result from the lateral sectional view according to FIG. 2. FIG. 2 is a cross-sectional view along line I-I from FIG. 1. The individual abrasive lamellae 4 consist of an abrasive fabric 8, comprising a base fabric 6 and abrasive grit 7 applied to the base fabric 6, which is shown as a layer for reasons of clarity in FIG. 2 and specifically comprises manifold abrasive grains, in the present exemplary embodiment having an average particle size of 348 μm (grain size 50 according to CAMI). The abrasive lamellae 4 are arranged overlapping one another around the center point of the passage opening 3. In FIG. 2, the entirety of the abrasive lamellae 4 are shown as the abrasive lamellae layer 4′ and the individual abrasive lamella 4a from FIG. 1 is indicated in this layer as an example. The flat abrasive lamellae 4 are arranged inclined at an angle of attack α in relation to the circular outer surface or support surface(s) of the carrier plate 2. The support surface O is a support surface on the carrier plate 2 extending substantially transversely to the axis of rotation R of the abrasive flap disc 1. The total of 36 abrasive lamellae 4 are implemented uniformly and are each arranged at an angular interval of 10° to one another uniformly distributed around the axis of rotation R of the abrasive flap disc 1.

(8) The abrasive fabric 8 comprises, in addition to a grit mixture, consisting of a mixture of zirconium oxide and aluminum oxide, further components, for example, calcium carbonate as a filler and phenol resin as a binder. In the concrete exemplary embodiment, the grit mixture of the abrasive grit consists of 70% zirconium oxide and 30% aluminum oxide, in relation to the mass proportions of the two components to the total mass of the grit mixture. With respect to the total mass of the abrasive fabric 8, the mass proportions and percentage mass/mass are zirconium oxide 30% and aluminum oxide 13%. The further mass proportions of the abrasive fabric 8 originate, inter alia, from the base fabric 6 consisting of polyester and further components contained in the abrasive fabric 8, for example, the filler calcium carbonate and the binder phenol resin.

(9) Furthermore, a single abrasive lamella 4 of the abrasive lamellae from FIGS. 1 and 2 is shown in a top view in FIG. 3. This individual abrasive lamella 4 has a width B of 28 mm and a length L of 20 mm.