Positioning device for positioning workpieces, machine tool with such a positioning device, method for positioning workpieces

摘要

Positioning device for positioning workpieces, machine tool with such a positioning device, method for positioning a workpiece A positioning device (1) for positioning workpieces relative to a machining device of a machine tool has a two-stage actuator (3) for two positioning elements (6). A drive pre-stage (69) of the actuator (3) comprises a controlled motor spindle drive with a drive motor (65) and a spindle drive (48, 56). An essential component of a drive output stage (70, 71) of the actuator (3) is a piston-cylinder unit (26, 27) which is both drive-connected and motion-connected with the positioning elements (6). By means of the motor spindle drive of the drive precursor (69), the piston-cylinder unit (26, 27) of the drive output stage (70, 71) is delivered to a drive position, which is associated with an intermediate position of the positioning elements (6). The delivered in the drive position piston-cylinder unit (26, 27) of the drive output stage (70, 71) moves the positioning elements (6) starting from the intermediate position relative to each other in a functional position in which the positioning elements (6) a workpiece in Direction of one of the positioning elements (6) defined positioning (11/1, 11/2) set. A machine tool is provided with a positioning device (1) of the above type. A method for positioning a workpiece relative to a machining device of a machine tool is carried out by means of such a positioning device (1).