In-Process Measurement of Barkhausen Noise for Detection of Surface Integrity during Grinding

The Barkhausen noise (BN) analysis is a method increasingly used for the post-process assessment of thermo-mechanical surface damages from grinding and has several advantages compared with established nital etching method. In-process measurement BN not been industrially yet, but basics have already developed promise time savings by avoiding spent on inspections after grinding. Furthermore, it bears potential optimization processes and, in perspective, process control. In present work, suitability in-process detection thermo-mechanically influenced near-surface regions was assessed. Case-hardened workpieces were ground, signals related to properties subsurface area, particular residual stresses, microstructure hardness results show clear dependency layer that allows an detrimental changes state. Special attention paid differences between measured signals, different parameters investigated.