Detection of Surface Damage after Grinding of Large Case–Hardened Bearing Rings

Abstract

This paper deals with detection of surface damage after grinding of bearing rings made of case hardened steel. Micromagnetic technique based on Barkhausen noise is adopted for monitoring of surface integrity during grinding rings of large diameter (1500 mm). Except micromagnetic testing, investigation of surface integrity is also expressed in such parameters as structure alterations, residual stresses measured via X - ray technique and microhardness measurement. It was found that Barkhausen noise technique enables reliable detection of surface integrity and damage induced by dry grinding and insufficient coolant supply can be easily distinguished.