Experimental approach for a grinding burn in-process inspection system based on Eddy Current

Abstract

During grinding some detrimental microestructural changes can appear in the workpiece if the temperature reaches the tempering point in the contact zone. This "thermal damage", commonly known as grinding burn, has negative consequences in the workpiece mechanical properties and its avoidance and detection is crucial to optimize grinding operations. Magnetic methods (Barkhausen noise, Eddy Current) are nowadays applied post process to detect burns automatically and without the subjectivity of the inspector (Acid Etching Method). However, the potential use of these magnetic methods during in-process inspection is a matter that has not been studied in detail yet. The objective of this paper is to evaluate the Eddy Current technology for the grinding burn inspection in combination with other process out-puts. Experimental tests have been performed in the machine at different conditions considering different inspection strategies. The results show the benefits of the present approach and serve as a starting point for the development of a future in-process inspection system.