Abstract:

Compared with the wet hobbing, the high-speed dry hobbing is more green and efficient, but its characteristics of larger spindle speeds and wider range of processing parameters directly affect the dynamic characteristics of the hob spindle system(HSS). In order to understand the rules of the different spindle speeds and feed rates acting on the vibration responses of the HSS, vibration response analysis of the HSS under cutting load with multi-parameter mixedly impacted is conducted. The natural frequencies and mode shapes are obtained through establishing the FE model and carrying out the corresponding modal analysis. The main cutting force under different processing parameters are tested, and its motivation is simplified to single frequency harmonic excitation. The frequencies and amplitudes of excitation cutting loads are set according to different processing parameters, and the vibration response laws of the HSS are revealed via frequency bands-divided vibration harmonic response analysis method. The spectrum curve of the HSS is got by the means of tapping test. Vibration response test with different processing parameters is done, and the reliability of the simulation analysis is verified. The processing parameter optimization can be guided by the obtained vibration response laws.

Key words: cutting loads, hob spindle system, vibration response, high-speed dry bobbing