Process for operating a virtual sensor for determining the condition of a tool holder on a tool machine; virtual sensor for determining the condition of a tool holder and tool machine

A process for operating a virtual sensor for determining a condition of a tool holder on a tool machine and a of a tool machine which has at least one tool holder and at least one tool, attached or attachable to the least one tool holder, the tool machine allowing a workpiece to be processed by running a machine program, and the tool machine having at least one control unit comprising at least one sensor, the process for operating the virtual sensor having following steps:

• recording at least one time-dependent, piece of body data of the workpiece, the at least one tool, the at least one tool holder, and/or at least one drive axle;
• recording at least one piece of time-dependent room data of the workpiece, the at least one tool, the at least one tool holder, and/or the at least one drive axle;
• recording at least one piece of time-dependent operating data, and/or recording a least one electrical current of the at least one tool holder and/or of the at least one drive axle;
• recording a time-dependent real total energy intake of one or more steps in the machine program using at least one of the control unit's sensors, and calculating a time-dependent, virtual total energy intake of one or more steps using a virtual simulation of the machine program with the control unit based on the body data, room data, and operating data recorded;
• and
• recording or calculating radial forces acting on the at least one tool holder, at least as the difference between the time-dependent real total energy intake and the time-dependent virtual total energy intake with the control unit.