New deep groove ball bearings high frequencies vibration testing

V Barzdaitis,M Vasylius,V V Barzdaitis,A Tadžijevas,R Maskvytis

doi:10.5755/j01.mech.20.3.6740

Abstract

The rolling bearing is a multi-body rotating system with rolling elements, inner, outer rings and cage transmitting motion and load from rotor to the bearing supports and machine body. The existence in the new bearing elements of micro-defects (surface roughness Rz, Rzmax, waviness Ws and of size rolling elements) generate stochastic high frequency vibration. It is important for manufacturing technology to examine quality of new bearings elements. This paper considers a new deep groove ball bearings single row 6205 2RSL C3/P6 experimental vibration testing method for quality assessment of new bearing separating micro-defects in inner raceway from micro-defects in outer races. This method is based on high frequency vibration measurements of lubricated and dry bearings with varied loads. DOI: http://dx.doi.org/10.5755/j01.mech.20.3.6740

Highlights

The rolling bearings generate mechanical vibration in wide frequencies range: from low mechanical kinematic vibration frequencies caused by bearing elements macro-defects up to high mechanical vibration frequencies generated by micro-defects existing in each element
The study of high frequency vibration response due to micro-defects is the task for quality assessment of new bearings
The stability of rotor bearing system with ball bearings is studied and emphasized that there are a lot of parameters which can act as a source of nonlinearity in such systems as: radial internal clearance, local surface micro-defects, slipping and skidding effects between the rolling elements

Summary

Introduction

The rolling bearings generate mechanical vibration in wide frequencies range: from low mechanical kinematic vibration frequencies (up to 1000 Hz) caused by bearing elements macro-defects up to high mechanical vibration frequencies (up to 10 000 Hz and greater) generated by micro-defects existing in each element. The study of high frequency vibration response due to micro-defects is the task for quality assessment of new bearings. The rolling element bearings are spallings of the races or the rolling elements This is caused when a fatigue cracks appear below the surface of the metal and propagates towards the surface until a piece of metal breaks away leaving a small pit or spall. The simulation of kinematic, dynamic and structural behavior in low frequency range of the rolling bearings vibration response without faults presented and analytical model is designed using Lagrange formulation and simulation results characterize the error signal in the inner raceway [3]. The vibration generated by direct metallic contact of rolling elements - raceways cages is caused by micro-defects and results in high frequency vibration acceleration of tested grease lubricated and dry bearings

Research method and theory

Conclusions

Summary