Fastening device for fastening a processing tool to a machine tool, tool arrangement, tool magazine, and method for operating a machine tool

1. A fastening device for fastening a processing tool to a machine tool, comprising:

at least one counter clamping body, against which the processing tool can be clamped;

a clamping unit for releasably clamping the processing tool to the at least one counter clamping body; and

a locking connection for releasably connecting the clamping unit to the at least one counter clamping body,

wherein the locking connection comprises at least one locking element, which can be brought into engagement with at least one locking engagement feature, and which is a locking bolt,

wherein the clamping unit and the locking connection are designed in such a way that a provision of a clamping force and the connection of the clamping unit to the at least one counter clamping body are accomplished independently of one another, so that the clamping force does not have to be overcome to connect the clamping unit to the at least one counter clamping body.

2. The fastening device according to claim 1 , wherein the processing tool is fastened to a press device.

3. The fastening device according to claim 1 , wherein

the clamping unit and at least one of

the at least one locking element of the locking connection or

the at least one locking engagement feature of the locking connection

are mounted on a closing body.

4. The fastening device according to claim 1 , wherein the locking connection comprises a latching connection for the latching connection of the clamping unit to the at least one counter clamping body.

5. The fastening device according to claim 1 , further comprising a linear guide for limiting movability of the clamping unit relative to the at least one counter clamping body along a joining direction.

6. The fastening device according to claim 1 , wherein the clamping unit has at least one spring means, via which a clamping force for clamping the processing tool is transmitted.

7. The fastening device according to claim 1 , wherein the locking connection comprises at least two of the locking elements or the clamping unit comprises at least two clamping elements for clamping the processing tool to the at least one locating body.

8. The fastening device according to claim 1 , wherein the clamping unit comprises an actuating engagement feature for manually operated movement of the fastening device between a clamping position and an open position.

9. The fastening device according to claim 1 , wherein the clamping unit comprises an eccentric shaft having a clamping eccentric portion for converting a drive torque into a clamping force for clamping the processing tool.

10. The fastening device according to claim 1 , wherein the clamping unit has a stable position in a clamping position, in which the processing tool is clamped to the counter clamping body.

11. The fastening device according to claim 1 , wherein the clamping unit comprises at least one deflection means for deflecting a driving movement by at least 45° into a clamping movement acting on the processing tool.

12. The fastening device according to claim 1 comprising at least one retaining means for fixing the clamping unit in a clamping position or an open position.

13. The fastening device according to claim 1 , wherein the processing tool is a press die or a forming die.

14. A tool arrangement for a machine tool, comprising:

the fastening device according to claim 1 ; and

a processing tool for processing a workpiece,

wherein the clamping unit is releasably connected to the at least one counter clamping body by means of the locking connection, and

wherein the processing tool is releasably clamped to the at least one counter clamping body by means of the clamping unit.

15. The tool arrangement as claimed in claim 14 , wherein the machine tool is a press device.

16. A tool magazine, comprising:

a magazine main body; and

a plurality of tool arrangements according to claim 13 mounted on the magazine main body.

17. A method for operating a machine tool, comprising the following steps:

providing a machine tool having a fastening device as in claim 1 ,

providing a processing tool for processing a workpiece,

arranging the processing tool at the at least one counter clamping body,

arranging the clamping unit at the at least one counter clamping body,

closing the locking connection to connect the clamping unit to the at least one counter clamping body,

clamping the processing tool to the at least one counter clamping body by the clamping unit, and

processing the workpiece by the processing tool.