Bearings, gears, shafts and many other surface hardened components in modern automotive and aerospace industries form a challenge to design and production engineers. They require special attention in choosing the correct parameters for the heat treatments as well as for the subsequent machining processes. The latter, if carried out inaccurately, may reduce in surface hardness and diminish the favourable compressive surface stresses after surface hardening. Accurate and continous control of machining processes such as grinding or hard turning is essential in today's production control. An inspection method based on the analysis of the magnetic Barkhausen noise (BNA) is capable of 100 % in-line control of many types of machine components. Proposed by a Finnish-American company, this method has been shown to be more sensitive than the conventional acid etch inspection. It is also superior to the alternative method using eddy current. The sensitivity of the Barkhausen noise method to minute changes in the level of surface residual stress allows detection of grinding damage at ist onset. A very good correlation is found between the Barkhausen Noise Level and the degree of thermal damage in ground steel workpieces. Tests made in the laboratory were repeated in a production environment and showed that the test method is suitable for heavy-duty industrial applications. The high sensitivity of the method allows detection of grinding abuse missed by other conventionally used methods of nondestructive inspection
Detection of thermal damage in steel components after grinding using the magnetic Barkhausen noise method
Nachweis thermischer Schädigung von Stahlbetonteilen nach dem Schleifen mit dem magnetischen Barkhausen-Verfahren
1998
8 Seiten, 3 Bilder, 3 Tabellen, 7 Quellen
Aufsatz (Konferenz)
Englisch
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