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

Abstract

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

Influence of Demagnetization and Microstructure Non-Homogeneity on Barkhausen Noise in the High-Strength Low-Alloyed Steel 1100 MC

“…On the one hand, the used sensor is capable of producing a stronger magnetic field altering in time [41], which might suppress the asymmetry in consecutive MBN bursts. However, the application of such magnetizing conditions can also result in a weaker sensitivity of MBN measurements to microstructure alterations and/or stress state, as reported in, e.g., [42][43][44]. Requirements considering sufficient demagnetization are associated with the magnetic field produced by the used sensor.…”

Using software to shape safety on the construction site

“…Most employers argue that it is possible to get the job done without the latest technology, as advanced techniques make it possible to stay on schedule and complete tasks efficiently. Also, one of the challenges is the desire to save as many resources as possible, including not investing in special safety equipment, but resorting to available tools and materials [1][2][3][4][5][6][7][8][9][10].…”

Effective energy management tools: inventory management and monitoring of energy consumption by personnel

“…It should also solve the problem of unfair wage payments, now you can't get paid for doing nothing. This will improve the atmosphere in the team, because there will be no unfairness [1][2][3][4][5][6][7][8][9][10].…”