APPARATUS FOR DIAGNOSTICS OF CONDITION OF CUTTING TOOL IN NUMERICAL PROGRAM CONTROLLED MACHINE TOOL Russian patent published in 1995 - IPC

FIELD: machine tool building. SUBSTANCE: apparatus has a power pickup, whose output signal, proportional to a cutting power value, is being fed simultaneously to an input of a feedback circuit and to an input of a circuit for signal procession. An input of the power pickup is connected with an output of a drive unit, providing a main motion. The circuit for processing signals has connected in series a filter, whose input being an input of the circuit for processing signals, first analog-to-digital converter, first memory unit, first digital-to-analog converter, first adder and first comparator; connected in series second analog-to-digital converter, second memory unit, second digital-to-analog converter, second adder and second comparator and also third comparator. An output of the power pickup is connected with an input of the filter, whose output is connected with an input of the first adder. An output of the first adder is connected with an input of the second analog-to-digital converter and with an input of the second adder, whose output is connected with an input of the third comparator. Output of the first, the second and the third comparators are at the same time the outputs of the circuit for processing signals, and they are connected with inputs of a control unit. Outputs of the control unit are connected with inputs of the first an the second analog-to-digital converters, with inputs of the first and the second memory units, an input of the feedback circuit and with inputs of the second and the third comparators. EFFECT: enhanced reliability of diagnostics of tool condition. 1 cl, 1 dwg