Investigation on Measurement for Micro Unbalance of Tiny Cylindrical Rollers of the High-Speed Precision Rolling Bearings

As one of the critical infrastructure components in modern industry, the high-speed precision rolling bearings are widely equipped on high-end advanced equipment. It is stringent requirement for China to develop the precision measurement technology about how to measure the unavoidable micro residual unbalance of the bearings' tiny cylindrical rollers, which seriously affects the performance and service life of high-speed precision rolling bearings. A tiny cylindrical roller is a rotor without shaft which cannot be mounted at rotor-bearing systems directly and the vibration response excited by micro unbalance is difficult to be detected and easy to be messed up with background noise. To make the precision measurement feasible, a soft support mounting bracket is designed. To measure the μm amplitude of vibration of mounting bracket, a high precision laser-based non-contact measurement system consisting of a roller rotation drive system, a vibration signal acquisition system and a signal process system are developed as well. Finally, the validity of the proposed measurement system is verified by comparing the measurement results of a standard roller and a special prepared unbalanced roller.