Clamping device for clamping a rod-like workpiece and machine tool so

摘要

Clamping device (12) for clamping a rod-like workpiece (2) for machining on a machine tool (1), comprising: a plurality of clamping jaws (24a-24d) extending along a respective clamping direction (+ Y, -Y, + Z, - Z) in the direction of a clamping center axis (22) are displaceable, one of the plurality of clamping jaws (24a-24d) associated plurality of first actuating elements (25a-25d), for moving the clamping jaws (24a-24d) in the direction of Spannmitten axis (22) are actuated, one of the plurality of clamping jaws (24a-24d) associated plurality of second actuating elements (27a-27d) for the displacement of the clamping jaws (24a-24d) in or against the clamping direction (-Y, + Y, -Z, + Z) are operable independently of the first actuating elements (25a-25d), wherein at least one of the second actuating elements (27a-27d) with at least one other of the second actuating elements (27a-27d) for common movement via a hydraulic Compound (34a-d) e Ines hydraulic circuit (33) is coupled to allow a compensating movement of the workpiece (2) in a plane (Y, Z) perpendicular to the clamping center axis (22), wherein in each case a first and a second adjusting element (25a-25d, 27a-d) are associated with each other, so that by the adjusting movement of the first adjusting element (25a-25d), the second adjusting element is movable (27a-27d), wherein the hydraulic circuit (33) at least one valve (35) for blocking or releasing the hydraulic connection between the at least two second actuating elements (27a-27d), and wherein the clamping device (12) further comprises: an actuating device (23) for synchronously actuating at least two of the first actuating elements (25a-25d) when the hydraulic connection between the respectively associated second control elements (27a-27d) is blocked by the valve (35) of the hydraulic circuit (33).