HOLDING DEVICE FOR THE SURFACE TREATMENT OF BAR CUTTERS

Abstract

A holding device for fastening bar cutters in order for the cutting edges thereof to be coated, wherein the fastening is configured in such a way that a plurality of bar cutters can be arranged in a row such that the cutting faces and tips thereof have the same orientation, and the holding device includes a screen which at least partially protects the cutting faces from the coating, wherein, with bar cutters arranged in a row in the manner described, the top edge of the screen projects beyond the knife tips in such a way that no knife tips protrude.

Claims

1. Holding device for fastening bar cutters for coating the cutting edges thereof, wherein the fastening is configured in such a way that a plurality of bar cutters can be arranged in rows such that their cutting faces and tips have the same orientation, and the holding device comprises a screen which at least partially protects the cutting faces from the coating, characterized in that with bar cutters arranged in rows in the manner described, the top edge of the screen projects beyond the blade tips in such a way that no blade tips protrude.

2. Holding device according to claim 1, characterized in that for the bar cutters arranged in the manner described, the screen is at a distance from the cutting faces.

3. Holding device according to claim 2, characterized in that the distance is between 1 mm and 10 mm, preferably between 1 mm and 5 mm, and even more preferably is 3 mm.

4. Holding device according to claim 1, characterized in that the screen is adjustable.

5. Holding device according to claim 4, characterized in that the holding device comprises four rows with magnets for fastening bar cutters.

6. Holding device according to claim 5, characterized in that two rows are provided for loading 2-side grinding bar cutters and the other two rows are provided for loading 3-side grinding bar cutters.

7. Holding device according to claim 5, characterized in that the holding device comprises adjustable lateral outer metal sheets.

8. Holding device according to claim 2, characterized in that the distance is between 1 mm and 5 mm.

9. Holding device according to claim 2, characterized in that the distance is 3 mm.

Description

AIM OF THE PRESENT INVENTION

[0023] One aim of the present invention is to provide a versatile holding device for the surface coating of bar cutters, with which a plurality of re-conditioning cycles can be performed with the 2-side grinding method without this resulting in an excessive layer buildup on the cutting face.

[0024] It is a further aim of the present invention to provide a versatile holding device for the surface coating of bar cutters, with which 2-side and 3-side grinding bar cutters can be coated in the same coating batch and with which the 2-side grinding bar cutters can be coated in such a manner that a plurality of re-conditioning cycles can be performed with the 2-side grinding method without this resulting in an excessive layer buildup on the cutting face.

[0025] The aim of the present invention is achieved in that a holding device with open design, as described in claim 1, is provided. Dependent claims relate to advantageous embodiments of the present invention.

[0026] The invention is based essentially on the effect of shading. Accordingly, the bar cutters are arranged in a holder and the cutting face is protected from the coating by a screen (hereinafter also called coating shield). This covers the cutting faces completely, i.e. does not follow the profile of the cutting extremities. This is in contrast to the masking known from U.S. Pat. No. 8,703,240. The screen can even extend over the tip of the bar cutter. According to the invention, and in a preferred manner, the screen is however not in contact with the cutting face but at a distance from the latter. This results, during the coating of the bar cutters, in the first and second surfaces being fully exposed to the coating application, whereas the coating application on the cutting face due to the shading effect of the screen still occurs, but to a clearly reduced extent. On the cutting face, a coating is formed whose thickness, starting from the cutting edge, clearly decreases. Surprisingly, it is not only the area of the tip of the bar cutter that is sufficiently coated beyond the edge, but also the area surrounding the edge.

[0027] After use and wear of the bar cutter, the first and second surfaces are then subjected to grinding according to the 2-face method. Since only the areas close around the edges of the cutting face are coated and this is removed after the first, second or at the latest third grinding process, this does not result in a multiple layer buildup. According to the invention, it is thus possible to achieve without a complicated and adapted masking device that, after several re-conditioning cycles, a detrimental multiple layer buildup on the cutting face can be avoided.

[0028] According to a preferred embodiment of an inventive holding device, an optimal loading can be achieved in that a design with four rows of bar cutters is implemented, as shown in FIGS. 6 and 7. The bar cutters 211a, 211b project on two sides out of the holder in order to allow an optimal coating result. The bar cutters 211a, 211b are held via magnets 201. The flexibility of the holder is achieved via a freely adjustable coating shield 205. This allows 2-side grinding bar cutters 211a and 3-side grinding bar cutters 211b to be coated, bar cutters with a smaller cross-section can also be coated. In this respect, the gaps arising between the bar cutters are closed by a coating shield. The easy adjustability of the coating shield 205 is achieved via the magnets 201 that can for example be provided as magnetic strip and can be placed at the top and at the bottom on the holder.

[0029] This holding device according to the present invention is, by comparison with the state of the art, more flexible in terms of the cross-section of bar cutters, since it allows the simple loading of bar cutters with different cross-sections, and thus the efficient coating of bar cutters of different sizes (both with different lengths as well as with different cross-sections) in the same batch. This flexibility is achieved among others by means of the easily adjustable coating shield 205, as mentioned above. Depending on the cross-section of the bar cutter, it can be moved into the desired position in order to achieve an optimal distance between cutting face and coating shield.

[0030] It is thus possible to coat in each row another type of bar cutter without having to reconfigure the holder.

[0031] Additional flexibility is achieved through the adjustable lateral outer metal sheets 230. This functionality makes it possible to achieve that, if a bar cutter with small cross-section is coated, the lateral outer metal sheet 230 can be displaced inwards. This has the advantage that in a facility with a certain amount of space, the useful areas can be used in an optimal manner and the loading for bar cutters with larger bar cutter length can be increased even when available space is restricted.

[0032] Additionally, the use of a holding device according to the present invention makes it possible to achieve an increased quality of the coating of 2-side grinding bar cutters due to the horizontal coating.