NOISE RATING UNDER WHEEL-SET PROCESSING BY CUTTERS

Abstract

Repair and restoration features of the electric wheel-set tyre roll surface on a wheel-type milling machine are considered. The processing is performed by a form cutter at speeds up to 180 rpm. Low speed and a substantial weight of the machine (37.5 tons) suggest that noise characteristics in the work area are determined by the processed wheels and cutting tools sound radiation. The study results of the cutter acoustic characteristics are presented. Bending vibration equations are solved with account for the rate of oscillatory energy loss which determines the cutting unit dissipation function. Thus, tool vibration velocity values are obtained. The installation of the mandrel with vibration cushioning elements, and the right roller bearing support upgrading allow increasing the cutting unit dissipation function. However, it may not be as sufficient for the cutting tool noise level lowering up to the admissible limit values. In this case, an acoustic baffle placed near the noise source can be used. At this, the acoustic baffle design becomes more simple, and its dimensions (length and height) — less.