Method for the offline and/or online identification of a state of a machine tool, at least one of its tools or at least one workpiece machined therein

A method for operating a machine tool and processing a workpiece in the machine tool, the method comprising:

• processing the workpiece with the machine tool, and
• identifying an operating state of the machine tool, either offline or online, with a control system of the machine tool by:
• a) for a series of time points ti, detecting positions pi of a tool of the machine tool or of a tool holder of the machine tool configured to hold the tool, with the positions being expressed as coordinates of a Cartesian coordinate system, wherein at least a position of the tool or of the tool holder is detectable by a sensor as a function of time,
• b) for the series of time points ti, establishing
• b1) a series of position changes Δmi of the tool, of the tool holder or of a preferably rotatable clamping apparatus of the machine tool configured to clamp the workpiece to be processed, in accordance with
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• b2) a series of speed changes Δvi the tool, of the tool holder or of the clamping apparatus in accordance with
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• determining for the position changes Δmi the respective components Δmxi, Δmyi, Δmzi and for the speed changes Δvi the respective components Δvxi, Δvyi, Δvzi in the Cartesian coordinate system, and
• c) identifying the operating state of the machine tool based on the position changes Δmi and the speed changes Δvi,
• wherein the operating state of the machine tool represents at least one of a movement of the tool or of the tool holder, a rest phase of the tool or of the tool holder, and a deviation from a predetermined movement speed of the clamping apparatus, and
• controlling the machine tool by the control system based on the identified operating state of the machine tool to optimize the processing of the workpiece.