Effects of Machining Ferromagnetic Materials on Magnetic Property Changes

Machining of ferromagnetic materials often changes their magnetic fields. This can lead to a contamination of the workpiece surface due to attracted particles and influence further processing and application. A better understanding of the mechanisms in machining processes leading to magnetic fields is a prerequisite to meet high cleanliness demands of the machined parts and the quality of the assemblies. In this paper, it is discussed which effects have to be examined to get a better understanding of the mechanisms. The setup of the measurement system is explained and the systematic proceeding in investigating the impacts is exemplified by test series, where process parameters of a milling operation have been varied and resulting surface changes and magnetic characteristics have been analyzed.