Theoretical study on vibroacoustic dynamics of split-type spindle heads

Vibration and noise levels of the split-type spindle heads are theoretically investigated. It is noted that in this case, the head oscillating system changes and this leads to the need of modeling the vibroacoustic dynamics of these structures. The calculation of the noise and vibration spectra is based on the power balance method of the construction consisting of a system of rectangular plates where the vibration power flows from spindle bearings are transmitted. The appropriate calculations for spindle cases made of steel and cast iron are carried out. The following data are obtained. The propagation velocity of flexural waves of an iron spindle case is factor of 0.62 lower, its own oscillation frequency is factor of 0.78 lower, the vibration power absorption coefficient is 11.4 times larger, which leads to a significant reduction in noise levels. The investigation timeliness is proved by an extended application of split-type spindle heads in the production, particularly in lathe tools.