DEVICE FOR MACHINING A PLANAR WORKPIECE AND CORRESPONDING METHOD

Abstract

The invention relates to a device for machining a flat workpiece, which comprises: a machine stand which comprises a support surface for a flat workpiece, wherein the support surface is formed by at least one counterholder, on the front face of which the workpiece can be placed, a hold-down unit, by means of which the workpiece is pressed against the support surface, and a processing head which can be moved relative to the support surface for the machining of the workpiece, wherein the at least one counterholder comprises a vibration damper which acts in a direction perpendicular to the support surface.

Claims

1.-16. (canceled)

17. A device for machining a flat workpiece, which comprises: a machine stand which comprises a support surface for a flat workpiece, wherein the support surface is formed by at least one counterholder which comprises a vibration damper which acts in a direction perpendicular to the support surface and comprises at least one brush element with a plurality of bristles, wherein the ends of the bristles of the brush element form the front face of the counterholder, on the front face of which the workpiece can be placed, a hold-down unit, by means of which the workpiece is pressed against the support surface, and a processing head which can be moved relative to the support surface for the machining of the workpiece, characterized in that the brush element comprises at least one brush strip having a length that is substantially greater than a width perpendicular to the length, wherein the bristles extend perpendicularly to the length and to the width.

18. The device according to claim 17, wherein the vibration damper is prestressed via a clamping force which is provided by the hold-down unit and/or by at least one component of the force of gravity of the workpiece, which acts perpendicularly to the support surface.

19. The device according to claim 17, wherein the vibration damper of the counterholder is formed on the front face of the counterholder and can be passed through by a tool, in particular a milling cutter, for the machining of the workpiece, without destruction of the tool.

20. The device according to claim 19, wherein the vibration damper comprises at least one passage channel extending parallel to the support surface, for a tool for the machining of the workpiece.

21. The device according to claim 19, wherein the vibration damper comprises a material which can be subjected to the processing, with formation of a passage channel, by the tool for the machining of the workpiece at a feed speed at which the processing head is moved over the workpiece, without destruction of the tool.

22. The device according to claim 17, wherein the brush strip is segmented in the longitudinal direction thereof, and comprises, in particular, several brush strip portions which are spaced apart from one another by a gap in the longitudinal direction of the brush strip.

23. The device according to claim 17, wherein the brush strip is arranged with respect to an expected feed direction of the processing head in such a manner that the brush strip can be passed through by the tool substantially perpendicularly to the length.

24. The device according to claim 17, wherein the brush element comprises a holding rail, on which the at least one brush strip can be fastened replaceably, wherein the holding rail is fastened directly or via a plurality of spacers on the machine stand, in particular by screw connection.

25. The device according to claim 24, wherein the holding rail comprises an undercut recess extending in the longitudinal direction of the holding rail for the mounting of the brush strip, wherein the holding rail comprises, on at least one of the longitudinal ends thereof, an opening through which the bristle strip can be inserted into the recess.

26. The device according to claim 24, wherein the holding rail comprises a mounting recess extending in the longitudinal direction thereof, along which the hold-down unit is slidably inserted.

27. The device according to claim 26, wherein the holding rail is a hollow profile which has an open longitudinal side, through which the mounting recesses accessible and which is limited by two parallel flanges which are spaced apart and extend perpendicularly to the support surface, and on the free longitudinal edge of which a respective brush strip is fastened.

Description

DRAWINGS

[0024] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

[0025] FIG. 1 shows an embodiment of the inventive device;

[0026] FIG. 2 shows an enlarged detail of the support face of the device according to FIG. 1;

[0027] FIG. 3 shows an embodiment of the inventive counterholder in a perspective representation;

[0028] FIG. 4 shows an enlarged detail of the front face of the counterholder according to FIG. 3 in a perspective representation;

[0029] FIG. 5 shows the counterholder according to FIG. 3 in an exploded perspective representation;

[0030] FIG. 6 shows an enlarged detail of the front face of the counterholder according to FIG. 5 in an exploded perspective representation; and

[0031] FIG. 7 shows a second embodiment of the inventive counterholder with clamped on workpiece.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] FIGS. 1 and 2 show an overall view of an inventive device for the machining of a flat workpiece, in particular of a mounting plate for the interior fixtures of a switching cabinet, as well as a detail view of the support surface 210. The device comprises a machine stand 200, which forms a support surface 210 for a workpiece (not shown). This support surface 210 is formed by counterholders 1 comprising brush elements 6. The counterholders 1 comprise a holding rail 10, which comprises a brush element 6 that faces the support surface 210 and is formed as a brush strip. The holding rails 10 are fastened via spacers 11 to the machine stand 200. The workpiece can be placed on the parallel bristle elements 6 which are spaced apart and can be fixed, for example, in the marginal area with retaining tabs, wherein the brush elements 6 form a vibration damper which suppresses vibration of the workpiece during the processing of the workpiece. For the processing of a workpiece, a processing head 300 can be moved over the support surface 210. The processing head 300 can comprise, for example, a milling cutter for the introduction of cutouts in the mounting plate and it can be designed in manner known from DE 10 2008 014 358 A1. However, the processing head 300 is not limited to such embodiments.

[0033] The counterholder 1 represented in FIGS. 3-6 consists substantially of a holding rail 10 and a brush element 6 formed as a brush strip mounted therein, which is formed as a brush strip. The brush element 6 in the process forms precisely the vibration damper 4. The holding rail 10 can be mounted via a plurality of equidistant spacers on a machine stand of a machining apparatus as known from DE 100 11 754 A1, for example.

[0034] As can be seen in FIG. 4, the holding rail 10 comprises an undercut recess 12, which extends in the longitudinal direction of the holding rail 10 and by means of which the brush element 6 formed as brush strip 9 is held. For the mounting of the brush strip 9, the holding rail 10 has an opening 14 on the longitudinal end 13 thereof, through which the brush strip 9 can be slid onto the holding rail 10. For this purpose, the respective brush strip 9 comprises, on facing sides, a groove 19 in which two facing flanges 20 of the holding rail 10, which limit the recess 12, engage and in this manner fix the brush strip 9 in the state in which it is slid onto the holding rail 10. The holding rail 10 is connected via bolts 21 to the spacers 11 (see FIG. 6).

[0035] Moreover, FIG. 4 shows that the bristles 7 of the brush strip 9 are arranged equidistantly and form passage channels 5 between adjacent bristles 7. The bristles 7 can be made of a resilient plastic. When, in this way, a tool, for example, a milling cutter, strikes the brush strip 9, then precisely the bristles 7 located in the feed direction of the tool are displaced, without in the process being excessively damaged by the milling cutter. If, after multiple uses, wear occurs on the brush strip 9, the latter can be replaced easily by pulling the strip from the rail 10 through the opening 14 out of the recess 12 and replacing it with a new brush strip 9.

[0036] The bristles 7 have substantially precisely the same length, wherein the free ends 8 thereof form the support surface for the workpiece. The resilience of the bristles 7 is adjusted so that, due to the weight of the workpiece itself and/or due to the prestressing force with which the tool is pressed against the bristles 7 due to the hold-down unit, the bristles 7 are prestressed to such an extent that, during the workpiece processing procedure, a vibration-preventing contact is maintained at all times between the bristles 7 and the workpiece.

[0037] FIG. 7 shows an embodiment of the inventive counterholder 1, in which a hold-down unit 3, which is designed here as a lever clamp, is slidably inserted in a mounting recess 15 extending in the longitudinal direction of the holding rail 10. In this manner, it is possible to arrange the hold-down unit 3 with respect to the holding rail 10 precisely in such a manner that the hold-down unit 3 can engage on the workpiece 100 in the marginal area of the workpiece 100.

[0038] The holding rail 10 is formed as a hollow profile which has an open longitudinal side 16 through which the mounting recess 15 is accessible. The mounting recess 15 is limited by two parallel flanges 17 which are spaced apart and extend perpendicularly to the support surface, and on the free longitudinal edge 18 of which a respective brush strip 9 is fastened, for example, plugged in. In this embodiment as well, the brush strips 9 can easily be replaced in the case of wear.

[0039] The features of the disclosure disclosed in the above description, in the drawing and in the claims can be essential, both individually and also in any combination, for the implementation of the disclosure.

[0040] The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.