Device and method for measuring and controlling a rotary-driven tool in a machine tool

A processing unit for measuring and controlling a rotary-driven tool, wherein the processing unit is connectable to a light barrier arrangement, which comprises a light-transmitting unit and a light-receiving unit, wherein the processing unit is configured to receive from the light-receiving unit analog signals that are at least approximately proportional to shading generated by the rotary-driven tool or at least one cutting edge of the rotary-driven tool at a first measuring position;

• wherein the light barrier arrangement further comprises:
• a first digital interface, which is configured to transmit status information of the light barrier arrangement to the processing unit and receive control signals from the processing unit;
• a low-pass filter unit, which is configured to filter frequency components of the analog signals that are higher than a predetermined limit frequency;
• a conversion unit, which is configured to convert the filtered analog signals into proportional filtered digital signals;
• a second digital interface, which is configured to transmit the filtered digital signals to a processing unit;
• wherein the processing unit is configured to evaluate the digital signals and to transmit control signals to the light barrier arrangement, wherein the evaluation of the signals received by the processing unit comprises the following steps:
• determination of an interference signal component or a useful signal component of the received signal;
• and
• provision of information about the useful signal component, the interference signal component or the received signal for forwarding to a numerical controller of a machine tool.

A processing unit for measuring and controlling a rotary-driven tool, wherein the processing unit is connectable to a light barrier arrangement, which comprises a light-transmitting unit and a light-receiving unit, wherein the processing unit is configured to receive from the light-receiving unit analog signals that are at least approximately proportional to shading generated by the rotary-driven tool or at least one cutting edge of the rotary-driven tool at a first measuring position;

• wherein the light barrier arrangement further comprises:
• a digital interface, which is configured to transmit status information of the light barrier arrangement to the processing unit and receive control signals from the processing unit;
• an analog interface, which is connected parallel to the digital interface, which is configured to transmit the analog signals to a low-pass filter unit of the processing unit and receive control signals from the same;
• wherein the low-pass filter unit is configured to filter frequency components of the analog signals that are higher than a predetermined limit frequency, and to transmit the filtered analog signals to a conversion unit of the processing unit;
• wherein the conversion unit is configured to convert the filtered analog signals into proportional filtered digital signals, transmit the filtered digital signals to the processing unit and receive control signals from the processing unit;
• wherein the processing unit is configured to evaluate the filtered digital signals and to transmit control signals, wherein the evaluation of the filtered digital signals received by the processing unit comprises the following steps:
• determination of an interference signal component or a useful signal component of the received signal;
• and
• provision of information about the useful signal components, the interference signal components and/or the received signal for forwarding to a numerical controller of a machine tool.

A processing unit for measuring and controlling a rotary-driven tool, wherein the processing unit is integrated into a light barrier arrangement, which comprises a light-transmitting unit and a light-receiving unit, wherein the processing unit is configured to receive from the light-receiving unit signals that are at least approximately proportional to shading generated by the rotary-driven tool or at least one cutting edge of the rotary-driven tool at a first measuring position;

• wherein the light barrier arrangement further comprises:
• a communications unit, which is configured to transmit status information of the light barrier arrangement to the processing unit and receive control signals from the processing unit;
• a low-pass filter unit, which is configured to filter frequency components of the analog signals that are higher than a predetermined limit frequency, and to transmit the filtered analog signals to a conversion unit of the processing unit;
• wherein the conversion unit is configured to convert the filtered analog signals into proportional filtered digital signals, transmit the filtered digital signals to the processing unit and receive control signals from the processing unit;
• wherein the processing unit is configured to evaluate the filtered digital signals and to transmit control signals, wherein the evaluation of the filtered signals received by the processing unit comprises the following steps:
• determination of an interference signal component or a useful signal component of the received signal;
• and
• provision of information about the useful signal components, the interference signal components or the received signal for forwarding to a numerical controller of a machine tool.

A method for measuring and controlling a rotary-driven tool, the method comprising the steps:

• registration of shading generated by the rotary-driven tool or at least one cutting edge of the rotary-driven tool at a first measuring position;
• generation of at least approximately proportional signals to the generated shading;
• determination of an interference signal component or of a useful signal component from the received signal, including determining the useful signal component or the interference signal component repeatedly;
• superposing of the repeatedly determined useful signal components or the repeatedly determined interference signal components;
• application of a block filter to the superposed useful signal components or the superposed interference signal components;
• determination of a representative value of the superposed useful signal components or the superposed interference signal components, to which the block filter was applied;
• and
• provision of information about the useful signal component, the interference signal component or the signals for forwarding to a numerical controller of a machine tool, including provision of information about the representative value of the superposed useful signal components or the superposed interference signal components to the numerical controller of the machine tool.