A numerical-control machine tool is provided that includes a tool-holder head which is provided with a tool-holder spindle and is capable of rotating/tilting the tool-holder spindle about two different rotation axes inclined to one another; a movable supporting structure that supports the tool-holder head; inclinometer microsensor(s) that are located on the movable supporting structure of the machine to measure/determine the tilt of the element on which the sensors are mounted; and an electronic control device that commands the moving members of the movable supporting structure and of the tool-holder head. The electronic control device is electronically connected to the inclinometer microsensor(s) controls the moving members of the movable supporting structure and of the tool-holder head based on signals arriving from the inclinometer microsensor(s), so as to correct the spatial position and/or the orientation of the tool-holder spindle.

A control apparatus for a welding tool includes a determination module for determining a normalized displacement signal, in which a deflection of a tong-shaped tool, due to an effect of a mechanical force generated on the tool during a work process using the tong-shaped tool, is compensated for. The control apparatus further includes a force regulation module for regulating a progression of the force which the tong-shaped tool applies to at least one component during the work process on at least one component. The force regulation module is configured to regulate the progression of the force during the work process based on the normalized displacement signal.

A numerical control device for a machine tool controls a machine tool having a main spindle for attaching a tool, a table holding a workpiece and a jig, three translational axes, and one or more rotation axis. The numerical control device includes an axis-dependent deformation error estimation unit, an input unit, a gravitational deformation estimation unit, a correction value calculation unit, and an addition unit. The correction value calculation unit calculates a correction value of the translational axes and/or the rotation axis with respect to an error of a position and/or a posture of the tool with respect to the workpiece, based on an estimated value of an axis-dependent deformation error, an estimated value of a gravitational deformation error, and command values. The addition unit adds the correction values to the command values.

The invention relates to a method for compensating deflection of a tool during machining of a workpiece using a machine tool, wherein a control unit of the machine tool balances the compensation of the deflection differently in straight portions (41) and in curved portions depending on a dimension E of engagement conditions in a contact point between the tool and the workpiece, a) on the basis of a ratio of a tool radius R1 and a radius of curvature R2 of the workpiece according to the formula E=R1/R2 and/or b) on the basis of a ratio of a current engagement length L of the tool in the circumferential direction on the workpiece and an engagement length LG of the tool in the circumferential direction on the workpiece during machining of a straight portion of the workpiece according to the formula E=L/LG.

A method for compensating for the deflection of a milling cutter during the machining of a workpiece by a numerically controlled machine tool having a plurality of axes includes: executing a learning cut on a test workpiece having a known geometry by the milling cutter mounted on a tool spindle in a climb milling mode, and in doing so, ascertaining a correlation between a quantity that is proportional to the torque of the drive of the tool spindle and the deflection of the milling cutter normal to a surface of the test workpiece, the deflection being determined by comparing the actual contour of the test workpiece to a setpoint contour. This is followed by storing of the correlation for the milling cutter and machining of the workpiece by the milling cutter in a climb milling mode, while utilizing the stored correlation for compensating for the deflection of the milling cutter by applying a positional correction that is proportional to the quantity to a setpoint position of the axes of the machine tool.

A method is provided for monitoring a milling method for a milling machine provided with a milling tool comprising cutting teeth, the method including: determining measured values of a first parameter corresponding to a bending of the milling tool as a function of a second parameter corresponding to an angle of rotation of the milling tool in a rotating frame of reference of the milling tool and analyzing the measured values as a function of at least one monitoring criterion.

A method to ascertain a quality of a product formed by a subtractive manufacturing device from a workpiece includes: determining a deflection/test force relation for a deflection of the device; measuring an actually exerted machining force applied by the device to the workpiece; automatically determining a machining force reference for the actually exerted machining force; automatically evaluating whether the actually exerted machining force deviates from the machining force reference. If an actually exerted machining force deviates from the machining force reference, then the method uses the deflection/test force relation to automatically determine for the actually exerted machining force, at least one correction deflection of the device and automatically creating at least one corrected drive control signal to fully or partially reduce the correction deflection.

The present invention discloses a machining error calculation apparatus for calculating the machining error more precisely through analysis. The apparatus comprises: a tool center displacement amount calculation part for calculating a displacement amount of a rotation center of the rotation tool according to the cutting resistance force in the rotation tool, in the case that the cutting resistance force generated in the rotation tool during said interrupted cutting is varied; a relative tool-edge position calculation part for calculating a relative tool-edge position of the cutting-edge portion with respect to the rotation center of the rotation tool; an absolute tool-edge position calculation part for calculating an absolute tool-edge position of the cutting-edge portion with respect to the workpiece, based on the displacement amount of the rotation center of the rotation tool and the relative tool-edge position; a machined shape calculation part for calculating the machined shape of the workpiece through transferring the absolute tool-edge position on the workpiece; and a machining error calculation unit for calculating a machining error of the workpiece based on a difference between the machined shape of the workpiece and an objective shape of the workpiece.