Abstract: A method for determining the clamping force of a force-actuated, rotationally drivable clamping device of a machine tool. An object is clamped with an actuation force F. Model-based calculation of the clamping force Fcalc to be expected is performed based on the actuation force F and the operating parameters of the machine tool in a control unit of the machine tool. Performing clocked measurement of the clamping force Freal acting upon the object in the clamping device within the time span of a measurement interval I. Wireless transming the measured value Freal to the control unit of the machine tool, and comparison of the measured value Freal with the calculated clamping force Fcalc. The measurement interval is adapted if the comparison reveals a deviation which reaches a threshold value.

Abstract: A clamping jaw for a chuck includes a jaw body on which there is formed at least one jaw step having a step head, which has a sensor on its end face, for holding a clamping insert which is formed from a base leg and two fastening legs projecting from the base leg. On each of the opposite longitudinal sides of the step head there is formed a threaded bore for receiving a fastening screw whose screw head is received in a through-opening which is formed in the fastening leg of the clamping insert that is assigned to the longitudinal side, wherein, on each side, the longitudinal axes of the threaded bore and of the through-opening assigned thereto have an offset when the base leg bears against the end face. Also, a chuck has a chuck body, in which such clamping jaws are arranged in uniformly-distributed radial jaw guides.

Abstract: A method for determining the clamping force of a force-actuated, rotationally drivable clamping device of a machine tool. An object is clamped with an actuation force F. Model-based calculation of the clamping force Fcalc to be expected is performed based on the actuation force F and the operating parameters of the machine tool in a control unit of the machine tool. Performing clocked measurement of the clamping force Freal acting upon the object in the clamping device within the time span of a measurement interval I. Wireless transming the measured value Freal to the control unit of the machine tool, and comparison of the measured value Freal with the calculated clamping force Fcalc. The measurement interval is adapted if the comparison reveals a deviation which reaches a threshold value.

Abstract: In a method for bending a sheet-metal part (50) on a profile body (24) having a bending profile (52), the sheet-metal part (26, 28) is pressed against the profile body (24) at an initial contact point (54), wherein bending rollers (26, 28), starting from the initial contact point (54), press the sheet-metal part (50) along the bending profile (52) against the profile body (24) and adapt it plastically to the shape of the profile body (24). Furthermore, a bending device (22) for carrying out the method is specified.