WO2012052090A1

WO2012052090A1 - Plated grinding tool

Info

Publication number: WO2012052090A1
Application number: PCT/EP2011/004436
Authority: WO
Inventors: Marion Wendt-Ginsbertg
Original assignee: Günter Wendt Gmbh
Priority date: 2010-09-29
Filing date: 2011-09-02
Publication date: 2012-04-26
Also published as: DE102010046878B3; WO2012052090A8; EP2621677A1

Abstract

The invention relates to a plated grinding tool which has a symmetrical configuration around an axis of rotation (1), in the form of a flap wheel, comprising a plurality of grinding plates (2) which are aligned axially to the axis of rotation (1) and are connected to a device for connecting the plated grinding tool to a drive device. According to the invention, the plated grinding tool comprises a support disk (7) that has a radial configuration around the axis of rotation (1), said support disk (7) supporting the grinding plates (2) in an essentially axial direction. It is proposed that the grinding plates (2) are directly connected to the device (3) by casting with a casting compound and that the support disk (7) is made of an abrasive material.

Description

Flap tool

FIELD OF THE INVENTION The invention relates to a lamellar grinding tool that is symmetrical about a

Rotary axis is formed in the form of a lamella grinding wheel. A plurality of axially aligned with the axis of rotation grinding lamellae are provided with a device for connecting the lamellar grinding tool with a

Drive device connected. The lamella grinding tool has a support plate formed radially around the axis of rotation, which supports the grinding lamellae in the

Basically supported in the axial direction.

Such flap grinding tools are preferably used for surface processing. The lamellar arrangement results in a very long service life of these tools.

State of the art

EP 1 068 048 B1 discloses a comprehensive discussion of the state of the art of such tools by mentioning a large number of documents, to which reference is made here.

Flap grinding tools are known in the art to machine workpiece surfaces without scoring the surface by scoring and the like.

For the processing of welds, for surface grinding, for rust removal and cast brushing, flap discs for use on angle grinders are known in which the trimming of grinding blades is arranged on the front side of a disk. Such flap discs are, for example, under the

Description horse Polifan commercially available and in the tool catalog 93/94 Fa. Hch. Perschmann GmbH, Braunschweig. Flap discs consist of a carrier plate made of fiberglass fabric mats, aluminum, steel or plastic, are fitted axially on the end with abrasive lamellae and point in the middle a usual mounting hole for attachment to the output spindle of a

Angle grinder on.

Such flap discs for use on angle grinders are also known from DE 195 1 1 004 C1. There is highlighted as a special feature that the carrier plate should consist of wood chips or wood chips, which should be embedded in a resin binder of cured phenolic resin and melamine resin and thus form a wood fiber reinforced plastic.

From DE 89 03 423 U1 a Schleiflamellenscheibe for use with angle grinders is known, in which on a disc-shaped carrier on both end faces a number of grinding blades is arranged to one hand the

To allow editing of walls of relatively narrow grooves and on the other hand to obtain an increased service life of the disc by reversibility. These are each made of shingled grinding lamellae

composing areas of interest mutually oriented to each other.

From EP 1 859 905 A2 a flap disc is known, which for

Improvement of their service life is equipped with disk packs, which have an im

Have substantially triangular shape. From DE 200 18 756 U1 is a

Grinding tool known in which the Besetz with abrasive material no longer from a punched Ronde, but from a variety of sickle-shaped

assembled individual blanks is composed. This should reduce the loss of material during manufacture. Grinding wheels are known from WO 2008/037320 A1, which have crescent-shaped grinding lamellae which partially overlap in order to achieve a minimum cutting.

Finally, US Pat. No. 5,722,881 A discloses a lamellar grinding tool with a trimming on abrasive lamellae on the radial circumference. The abrasive lamellae are directly on the radial outside with the help of an epoxy resin

glued disk-shaped support body, wherein the disk-shaped support body consists of an inner sheet metal disk and an outer glass fiber disk. For attachment to a commercial angle grinder is the steel disc in the Center provided with a weld nut, which protrudes beyond the outer surfaces of the grinding blades formed by the outer surfaces.

The document JP 60094271 AA discloses a lamellar grinding tool with a device for connecting the tool to a drive device, as well as an associated support plate made of glass fiber fabric.

The document DE 20 2004 004 027 U1 discloses a flap disc with a disc or plate-shaped carrier and with abrasive sheets which are fastened in a shingling manner on the carrier in an adhesive bed, wherein on the periphery of the flap disc recesses are cut away, the recesses being approximately trapezoidal are or have the shape of the part of a circular ring, wherein at least the rear in the direction of rotation of the grinding wheel edge of the recesses extends approximately radially.

The European patent application EP 1 231 024 A1 discloses a support plate for a flap disc consisting of a glass fiber reinforced phenolic resin body, the upper cover layer of a textile glass fabric or a

Textile glass scrim, a middle layer of a fiber mat and a lower cover layer of a textile glass fabric or a textile glass scrim.

All these known disk grinding tools have special applications and fulfill their function. It is also known that the usual materials for backing pads each have specific disadvantages, in particular when the backing pads come into contact with the workpiece. Glass-fiber-based backing pads can release dust, steel is relatively heavy and leaves scratches, aluminum is very expensive and smears when rubbing contact, plastics and resin composites can lubricate.

The invention is therefore based on the object to provide a blade grinding tool, in which without reducing the reliability more economical and in terms of waste improved use and wider scope is possible.

Description of the invention

This object is achieved by a slat grinding tool of the type mentioned, in which the grinding blades by casting with a potting compound directly with the device for connecting the

Lamella grinding tool are connected to a drive device, and that the support plate consists of an abrasive material.

The inventive design of a lamellar grinding tool recording the acting on the grinding blades operating forces by the

Casting core ensured. In addition, a softer blade grinding tool is obtained by the greater compliance of the backup cell material compared to conventional backing pads. Nevertheless, by the mild

Supporting effect in relation to known so-called "plate-less"

Flap discs significantly better protection against kinking

Abrasive blades given too steep angle and / or excessive contact pressure. Kinked sanding lamellae easily lead to damage of the

Workpiece surface and premature failure of the tool.

Finally, in a tool according to the invention without hesitation the

Abrasive blade portion are worn, leading to a much higher effective life of the tool, since the support plate according to the invention can be consumed even as a grinding tool. This is also the risk

excluded that contact between support plate and workpiece unwanted damage or even damage to the workpiece may occur.

The backing pad is suitably made of a material that can be abraded, such as an abrasive cloth, a fibrous material, a grid cloth, or a nonwoven abrasive. This also includes so-called Surface Conditioning Material (SCM). For the best possible and consistent grinding quality at maximum

Economics by practically complete consumption of the grinding tool, it is advantageous if the material of the backing plate has approximately the same grain size and / or substantially the same abrasive comprises, as the

Grinding blades.

For the users of a flap grinding tool according to the invention, the security against injuries, in particular in the head area, can be substantially improved if the flap grinding tool is provided with a label that is arranged radially inside the grinding bars on the axial side of the flap grinding tool opposite the backing plate. If a conventional flapper disc loosens the machine-side label, there is a risk that the flying tag will hurt the user. The inventive construction, it is possible to attach the label on the workpiece side of the tool and to achieve so that the user is protected by a self-releasing label by the flapper disk itself.

Description of preferred embodiments

The invention will be explained in more detail below with reference to exemplary embodiments illustrated in the drawings. Show it:

Fig. 1 shows an inventive lamella grinding tool with axial

arranged grinding lamellae in view of the workpiece side, with a circular label;

FIG. 2 shows a lamellar grinding tool according to the invention from FIG. 1 in a view of the machine side; FIG.

3 shows an inventive lamella grinding tool from FIG. 1 in FIG

Side view; and

Fig. 4 similar to a further inventive lamella grinding tool

Figure 1 with the workpiece side arranged annular label. In Fig. 1, a lamella grinding tool according to the invention is shown, which is symmetrical about a rotation axis 1 and a plurality of frontally arranged axially to the rotation axis 1 grinding lamellae 2. The grinding lamellae 2 are connected radially directly to a device for connecting the lamellar grinding tool to a drive device (not shown) via a potting compound 4. The device for connecting the lamellar grinding tool with a drive device may be formed by a hub 3, as shown in Fig. 4. The hub 3 may be designed differently according to the invention. The hub 3 may, for example, have a central hole for attachment to a drive device, or the hub 3 may, as described below with reference to FIG. 2, comprise a female thread. The radial connection of the grinding blades 2 with the hub 3 via the potting compound 4 absorbs the operating forces to which the grinding blades 2 are exposed, in particular the centrifugal forces.

The hub 3 comprises in the embodiment shown in Figure 2 an MM nut thread 5 for direct attachment to conventional drive spindles of angle grinders (not shown) as a drive device. Instead of the nut thread, other connecting means suitable for connecting the lamellar grinding tool to a drive device can also be used, as already mentioned above. The illustrated embodiment of the hub 3 comprises a flange 10 with an external hexagon 6 for attachment of a wrench when attaching or detaching the grinding tool according to the invention to or from the drive spindle of the drive device, as can be seen well in FIG.

On the side facing the drive machine of the lamellar grinding tool is a support plate, which consists of a grinding material in the form of a grinding wheel 7, for example, an abrasive cloth arranged, which supports the slats 2 in the grinding operation in the axial direction. As a result, breaking or buckling of the slats 2 in use is largely prevented despite high flexibility of the disk grinding wheel, and thus increases the economic usability of the tool to the point of complete wear. The support plate may for certain applications have the same material as the lamellae 2, in particular the same Abrasives in approximately the same grain size. Thus, it can be ensured that even if the slats 2 are worn and the user continues to grind with the support plate 7, no significant changes in the grinding pattern or even damage to the workpiece occur.

Apart from abrasive cloth, lattice cloth, fiber material or SCM material or abrasive fleece are well suited as material for the backing pad 7.

As can be seen in FIG. 4, a lamellar grinding tool according to the invention is provided on the workpiece side with a label 8 which extends radially inside the workpiece

Abrasive blades 2 is arranged on the support plate 7 opposite axial side of the blade grinding tool. In this case, the label 8 is attached to the axial end face of the resulting by the potting compound 4 body within the radial inner edges 9 of the grinding blades 2. By the

inventive attachment of the label 8 on the side facing away from the user of the tool, the user is better protected against injury when the label 8 should be released from the tool. In the embodiment shown in Figure 1, the nut thread 5 does not go through, but the potting compound 4 covers the opening on the workpiece side of the lamella grinding tool.

As a result, on the workpiece side, a printing or a label 8 are applied, which covers the entire surface within the radial inner edges 9 of

Abrasive slats 2 can take and thus provides more space for the reproduction of information. After the lamellae 2 have been sealed with an adhesive or a potting compound for connection to the hub 3, a label 8 can be applied to the body facing the workpiece axial end side of the lamellar grinding wheel on the body formed by the potting compound 4, as shown in FIG. It is clear to a person skilled in the art that various combinations of the features according to the invention in the context of the attached by

Claims defined objects of the invention are possible and the above description of exemplary embodiments is to be understood as illustrative and not restrictive.

Claims

claims

A fluted grinding tool formed symmetrically around a rotation axis (1) in the form of a flap wheel with a plurality of abrasive flaps (2) aligned axially with the rotation axis (1) and connected to a device (3) for connecting the flap grinding tool to a drive device and wherein the lamellar grinding tool has a support plate (7) formed radially around the rotation axis (1), wherein the support plate (7) supports the grinding lamellae (2) in a substantially axial direction, characterized

in that the grinding lamellae (2) are connected directly to the device (3) by casting with a potting compound, and in that the support plate (7) consists of a grinding material with an abrasive.

Slat grinding tool according to claim 1,

characterized in that the backing pad (7) consists of an abrasive cloth, an abrasive cloth, a grid cloth, or a nonwoven abrasive cloth, as well as SCM.

Lamella grinding tool according to one of the preceding claims, characterized in that

the material of the support plate (7) has approximately the same grain size as the grinding lamellae (2).

the material of the backing plate (7) comprises substantially the same abrasive as the abrasive flaps (2).

the lamellar grinding tool is provided with a label (8) that is arranged radially inside the grinding lamellae (2) on the support plate (7). opposite axial side of the lamella grinding tool is arranged.