Method for diagnosing the state of bearings of spindle units by the energy of the vibration signal

Abstract

Abstract The work considers improved approach to assessing the serviceability of bearing assemblies of spindle groups of metal-cutting machines. As a basic malfunction, we looking a variant of the defect of the outer ring of the rolling bearing separator. For this task the calculated values of the vibration frequencies were obtained, and a full-scale experiment was conducted with the evaluation of the vibration signal on a large spectrum of frequencies. The results of the experiment showed that it is possible to assess the degree of bearing damage both from the spectrum of signal amplitudes and from the rms value of the vibration signal (RMS). However, studies have shown that the most beneficial, from the point of view of diagnostics, is to consider RMS not for the entire vibration signal, but only in the frequency range corresponding to the diagnosed bearing malfunction.