EP0924031B1 - Tool for working surfaces and edges - Google Patents

Abstract

A wire brush for surface preparation e.g. for deburring machined surfaces, has bundles of parallel wire bristles secured to the brush head with resin. The bristles are set at 25 to 35 degrees to the rotating axis (3) of the brush, to work the edges of the surface profiles. The bristles (4) can be straight wires or wavy type of wires, which provide a sprung effect. Bundles of bristles are held in the resin and after setting of same the ends of the bundles are cut to form a flat surface.

Description

The present application relates to a tool according to the The preamble of claim 1, a method for the same Manufacturing as well as a process for processing Workpiece surfaces according to the preamble of claim 6.

For the machining of workpiece surfaces and edges are traditionally used, for example rotating bristle tools used. These tools essentially have a surface to be machined vertically aligned axis of rotation and essentially parallel bristles resp. bristle bundles on. When the tool is working, i.e. if the axis of rotation of the Tool is driven, the bristles are in centric circles around the axis of rotation machined workpiece. Here come in essentially the bristle tips in contact with the Surface of the workpiece. If the workpiece is now in the Surface a cutout resp. Opening, so the bristles penetrate this cutout. Through the Rotation of the tool and the grinding resistance the contact of the bristle tips with the The bristles become light during operation bent backwards against the direction of rotation. Thereby only slightly brush the bristle ends when cutting over its edge and then immediately spring into hers Home position, parallel to the axis of rotation, back. This will the cut surface of the cutout practically through the Bristles not processed. On the opposite The cutting edge now essentially does not meet this Bristle end on but an area of the bristle body. This will cause the bristle to turn slightly against the Direction of rotation bent out and the Bristle tip does not come into contact with the Cut surface and comes into contact with the Cutting edge.

DE 31 05 551 is now a bristle tool described, which is not rotating, but in the plane is driven vibratingly, as for example by Orbital grinding machines are known. This solution advises now completely from the use of rotating tools, because there is the risk of individual bristle parts breaking out exists. Such a tool is probably suitable for the removal of material, but this remains in the Bristle area back, i.e. is not going through independently the tool is removed, thereby reducing performance of the tool. Such a tool is also suitable practically only for processing surfaces, but not of cut edges.

Another bristle tool is now from DE 1 12 382 known, which is designed as a sweeper, i.e. in the essentially not ablative but transporting away is used. Accordingly, both the burden for the bristles as well as the material requirements different from essentially abrasive tools. In in this case it is even possible that the bristle ends are angled to a substantial length. This too Execution is particularly suitable for the processing of essentially flat surfaces and not for the Processing cut edges in such planes!

Such conventional bristle tools have from reasons described in particular for deburring the Cut edges of cutouts in the workpiece surface and machining the perpendicular to the workpiece surface trending cut surfaces a bad one Machining efficiency.

Further is from JP-A-09085633 Patent Abstracts of Japan the view of a bristle tool with a represented plate-shaped base body, of which the Bristles in several, tangentially one after the other arranged, having a triangular cross section protrude dense bundles of bristles from the base body. additionally are oblique with respect to the drive axis of the tool arranged through holes formed in the base body, through which the accumulated in the center of the tool Processing dust can be extracted. Here are the outer radial edges of the bristle bundle in relation to the Basic body inclined, and thus form each between two neighboring bristle bundles an oblique Channel from the outside to the inside of the tool. This does, however, oppose the removal of the grinding dust other conventional brushes improved, the real one Grinding effect on the one hand through the formation of relatively large, transverse areas without Brushing and on the other hand by radially continuous, large, dense bundles of bristles worsened, resulting in an inhomogeneous grinding pattern with deteriorated Machining efficiency leads.

The object of the present invention was now to to find such a processing tool with bristles, which has an improved machining effect in the range of Shows sections of workpiece surfaces.

According to the invention, this object is achieved by a Bristle tool with the features of claim 1 solved. Preferred embodiments of the invention result from further claims 2 to 5.

Due to the arrangement of the bristle bundles and Alignment of the respective bristles of a bundle of bristles there is the possibility of advantageous processing especially the cut edges of recesses respectively. Cutouts of the workpiece surface to be machined. Advantageously, both the cutting edge and the cut surface through the individual bristles of the Bristle bundle optimally processed.

Due to the parallel arrangement of the bristles according to the invention within the bristle bundle, a uniform, defined resistance behavior of the bristles and thus also achieved a homogeneous processing image. The preferred Embedding the bristles in a common holding layer leads to a uniform, level working surface, formed by the tips of the bristles. This eliminates any post-processing of non-uniform resp. bristles protruding from the tool body. This advantageously leads to an optimal Run-in behavior, i.e. the tool shows in new condition no running-in phase different from the operating phase on.

A particularly advantageous processing image results by the inventive method according to claim 6, by the individual bristles through the inventive First intervene in the direction of rotation in the cutting edge area, with the further rotation of the tool against the Cushion the direction of rotation and thereby the cut surface hike along down. By further turning the The bristles continue to counter the tool Direction of rotation bent backwards and then over the cutting edge upwards in the direction of rotation of the Tool removed.

Next is a method for producing such Tools proposed according to claim 8. preferred Embodiments of the method result from the dependent claim 9.

Fig. 1 schematisch die Seitenansicht eines herkömmlichen Werkzeuges;

Fig. 2 den Radialschnitt durch ein erfindungsgemässes Werkzeug;

Fig. 3 den Tangentialschnitt durch den Bereich eines Borstenbündels des erfindungsgemässen Werkzeuges von Figur 2;

Fig. 4 - 6 schematisch der Querschnitt durch ein Werkstück mit einer eingreifenden Borste eines erfindungsgemässen Werkzeuges bei der drehenden Bearbeitung;

Fig. 7 die Ansicht einer bevorzugten Ausführungsform eines erfindungsgemässen Werkzeuges; und

Fig. 8 die Ansicht einer bevorzugten Ausgestaltung einer einzelnen Borste.

An embodiment of the invention is explained in more detail below with reference to figures of the accompanying drawing. Show it

Figure 1 shows schematically the side view of a conventional tool.

2 shows the radial section through a tool according to the invention;

3 shows the tangential section through the region of a bristle bundle of the tool according to the invention from FIG. 2;

4 - 6 schematically show the cross section through a workpiece with an engaging bristle of a tool according to the invention during rotating machining;

7 shows the view of a preferred embodiment of a tool according to the invention; and

8 shows the view of a preferred embodiment of a single bristle.

In Figure 1 is the side view of a conventional one Bristle tool 1 shown. Are in one Base body 2, which rotates about an axis 3 can be driven, a plurality of bristle bundles 4th arranged. The bristle bundles 4 are conventional formed from a plurality of individual bristles 4 ', which on the bundle base, for example, by entanglement are summarized and by means of metal clips be held together. These bundle arrangements are in appropriately designed bores in the base body 2 introduced and fixed in it.

The disadvantage of this arrangement is already from the schematic representation in Figure 1 can be seen by the Bristle bundle 4 due to the arrangement described respectively. Fastening in the base body 2 at the free ends easily fanned out conically. As a result, the individual bristles 4 'of a newly manufactured one Tool 1 usually slightly different lengths on. Due to these different lengths, such Tools have a bad running-in behavior, i.e. the Processing image resp. the processing effect of the Tool is not homogeneous over the service life. The longer bristles become during the running-in phase more stressed than the shorter bristles and use with it faster until the use of the Tool has a homogeneous effect through about the same now long bristles results. However, this running-in phase can now according to the types of bristles used and those to be processed Workpieces are of different lengths and are not determinable. If the workpieces to be machined after the Machining should have a homogeneous surface either the running-in phase separately and therefore unproductive be carried out until the desired effect has been reached, or the bristles must be in advance after manufacturing the tool to the same length to be edited. Such processing is on the one hand, very complex and therefore also expensive and can only be used with one limited accuracy.

A tool according to the invention, such as a partial area in the Radial section shown in Figure 2 now avoids these disadvantages effective. Here are the individual bristles 4 'aligned parallel to one another in a base layer 5 arranged embedded on the base body 2. Through the parallel embedding can bristle bundle 4 with parallel aligned bristles 4 'are formed, which for example a round or oval cross section forming cylinder, and not conical are fanned out. This already applies to the new, unused tool a homogeneous working surface, formed from the free ends of the bristles 4 ', which are not subsequently added to the correct length of the Bristles 4 'must be processed.

Furthermore, the bristles 4 'according to the invention are tangential in Direction of travel L seen at an acute angle α arranged with respect to the axis of rotation 3 of the tool, such as emerges from the tangential section A-A in FIG. By this arrangement becomes a conventional one Tools significantly improved machining effect in particular of recesses to be machined Workpieces are reached, as follows with reference to FIGS. 4 to 6 will be explained in more detail.

Figure 4 shows schematically in section a single bristle 4 'of a tool according to the invention in intervention in the direction of rotation according to the invention Workpiece 6 resp. into a recess 7 arranged therein with cut edge 8 and cut surface 9. The bristle 4 ' thanks to the position pointing in the direction of rotation L. its tip in the area slightly below the cutting edge 8 on the cutting surface 9.

By further turning the tool in the direction of rotation L is the bristle 4 'with its tip down along the Cutting surface 9 moves, whereby the cutting surface 9 is processed. In the shown in Figure 5 The bristle 4 'has its lowest position in the rotational position is reached and is turned up again when it is turned further drawn.

When the tool is turned further, the bristle becomes 4 'pulled over the cutting edge 8, which thereby is processed as shown in Figure 6. At the A subsequent recess 7 is swept over Bristle 4 'when immersed in the recess 7 back into the Rebound position shown in Figure 4 and as above appear described.

To the illustrated effect of editing the Cutting edge 8 and the cutting surface 9 further can improve the bristles 4 'instead of a smooth, cylindrical shape a slightly wavy, have a corkscrew-like shape, as in FIG. 8 is shown.

Figure 7 now shows the supervision of the Processing area of a designed according to the invention Tool 1. Here are individual bristles 4 'to each a round cross-section bundles 4 over the Base layer 5 with the base body 2 of the tool 1 connected. The bundles 4 are each radial on a line arranged from the center of the tool, the individual bristles 4 'each in parallel next to each other an angle with respect to the tool axis 3 in the direction of rotation L of the tool are arranged aligned. Of course, the bundle 4 can for example each concentrically running lanes regularly spaced apart.

The base layer 7 is preferably a cast resin layer 5, with which the against a suitable holder the base body 2 of the tool 1 positioned bristles 4 'are shed. This has the advantage that the bristles 4 'each individually in the hardened casting resin compound are embedded, which is an ideal anchorage for the Bristles 4 'represents. This anchoring causes one reliable clamping of the bristle base with constant Angle α of the bristles.

By choosing the bristle material, the bristle thickness and the bristle length can be different Bending resistance moments of the individual bristles 4 'and thus of tool 1 can be set and the Application needs designed accordingly Tool types can be made available.

The tools according to the invention have advantageously very good running-in behavior, i.e. it there is practically no running-in phase with one against the subsequent operating time changed effectiveness. In order to there is no need for any processing of the bristle lengths any unproductive running-in phases before use with immediate, even processing quality of the Tool.

The effect of the tool can also be significant better adjust or define based on the defined Resistance behavior of the bristles in the base layer and have due to the inventive orientation of the Bristles against the direction of rotation a better one Machining behavior of the cut edges of recesses in workpieces to be machined.

Claims (9)

1. Tool for the abrasive machining of surfaces, comprising a disk-like carrying body (2), which is rotatable about a tool axis of rotation (3) and on which are provided abrasive means in the form of bristle bundles (4), which are mounted in and project from the carrying body (2) and are disposed so as to be aligned obliquely at an acute angle (α) relative to the tool axis of rotation (3), characterized in that a plurality of such bristle bundles (4) are arranged at intervals both in radial and in tangential direction relative to the tool axis of rotation (3), wherein the bristles (4') of each bristle bundle are aligned substantially parallel to one another and in tangential direction at an acute angle (α) relative to the tool axis of rotation (3).
2. Tool according to claim 1, characterized in that the angle (α) is between 5° and 45°, preferably between 25° and 35°.
3. Tool according to claim 1 or 2, characterized in that the bristle bundles (4) are embedded in a common retaining layer (5) connected to the carrying body (2).
4. Tool according to claim 3, characterized in that the retaining layer (5) is a casting resin layer.
5. Tool according to one of claims 1 to 4, characterized in that the individual bristles (4') have a waved, preferably elongated helical configuration.
6. Method of effecting abrasive machining of the cut edges of recesses and/or cut-outs of surfaces with a tool according to one of claims 1 to 5, characterized in that the operating direction of rotation (L) of the tool axis (3) is set in such a way that the bristles (4') of the bristle bundles (4) act upon the surface aligned in relation to the tool axis of rotation (3) at the angle (α) tangentially in the operating direction of rotation (L).
7. Use of a tool according to one of claims 1 to 5 and/or of the method according to claim 6 for machining the cut edges of recesses and/or cut-outs of surfaces of workpieces.
8. Method of manufacturing a tool (1) according to one of claims 1 to 5, characterized in that the bristles (4'), by means of a holding apparatus, are held in the desired alignment and aligned relative to the carrying body (2) and then a casting resin is applied onto the carrying body (2) in the region of the bristle ends.
9. Method according to claim 8, characterized in that the bristles (4') are firstly all cut to the desired, uniform length and held in the holding apparatus in such a way that the bristle ends, which project from the carrying body (2) after casting, are all of the same height.

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