Abstract
In the course of the study, amplitude-frequency characteristics of the responses of vibrational acceleration of the spindle unit were obtained experimentally with a short-term impact of a force directly on its spindle. By analyzing the frequency composition of amplitude spectra, the peaks of natural frequencies of the spindle unit were determined at various values of the preload, and, accordingly, the operating modes of the spindle unit were selected, which would reduce its vibration activity and increase processing accuracy.
Highlights
The preload forces determine the dynamic quality of spindle units, and the task of developing methods for assessing it, especially without disassembling them, is urgent
It is necessary to ensure that the response signal amplitude does not exceed the dynamic range of the vibration acceleration sensor used and does not leave residual deformations on the elements of the spindle unit [4, 5]
Based on the amplitude spectrum or the power spectrum, one determines the resonant frequency ranges for the entire range of preload values of the rolling bearings used in the diagnosed spindle for which dynamic quality is maintained or enhanced
Summary
The preload forces determine the dynamic quality of spindle units, and the task of developing methods for assessing it, especially without disassembling them, is urgent. At the stage of installation and repair work, as well as in the case of organizing control over the state of the spindle units and during breaks in their operation, it is necessary to diagnose the condition of the spindle supports and determine the value of their preload.
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