Facing head and method for clamping and releasing a tool in or from a tool holder device of the facing head

A facing head for use in a machine tool that comprises at least one working spindle, the facing head comprising:

• a housing body that comprises a spindle coupling device that is configured to be exchangeably coupled with a spindle chuck of the working spindle of the machine tool, wherein the spindle coupling device is arranged coaxially to a rotation axis;
• a facing slide that is moveably supported in a guided manner at or in the housing body, wherein a hydraulically controllable tool holder device is arranged at the facing slide configured for holding a tool, wherein the facing slide and/or the tool holder device comprises at least one hydraulic coupling by means of which a hydraulic pressure in at least one working chamber of the tool holder device can be changed in order to switch the tool holder device between a hold condition holding the tool and a release condition releasing the tool;
• and
• an adjustment device that is configured to move the facing slide relative to the housing body between a tool change position and at least one working position that is different from the tool change position, wherein in the tool change position the at least one hydraulic coupling of the tool holder device is fluidically connected with a hydraulic control coupling provided at the housing body and wherein in the at least one working position the at least one hydraulic coupling is fluidically disconnected from the hydraulic control coupling.