METHOD FOR VIBRATION DIAGNOSTICS OF STATE OF BEVEL GEAR AND EVALUATION OF ITS EFFECT ON MILLING PROCESS Russian patent published in 2024 - IPC G01M13/21 

FIELD: measurement.

SUBSTANCE: invention relates to methods of vibration diagnostics of technical condition of bevel gear. Spindle rotation speeds is pre-selected. Natural frequencies of the elements included in the machine tool system are determined. Signal is picked up from vibration sensor installed on process system. Obtained data are recorded in the memory of the computing device in real time in the form of numerical sequences. Section corresponding to integer number of spindle revolutions is selected for further processing, including determination of root mean square values (RMS) and decomposition into trigonometric series. At the same time the vibration sensor is installed on the workpiece fixing table. Vibrations are recorded during milling. Spindle rotation speed is set so that bevel gear tooth frequency differs from natural frequencies of process system elements by maximum possible value. Obtained numerical sequence is divided into sections equal to the period of one revolution of the spindle, and numbers of the sequence of each section, which are in identical angular phases, are summed up. For the accumulated numerical sequence obtained after summation, its envelope is determined by calculating a sliding RMS. For the envelope, a trigonometric series is constructed on the selected period, in which amplitudes of harmonics with numbers corresponding to the number of cutter teeth are recorded. Diagnostic parameters used are amplitude of harmonics with number of tooth frequency and ratio of amplitudes for numbers of harmonics corresponding to tooth frequency and number of cutter teeth.

EFFECT: increasing the accuracy of vibration diagnostics of the technical condition of bevel gear.

1 cl, 4 dwg