RECTIFICATION DE DENTURES DE REacute;DUCTEURS NITRUREacute;ES Agrave; L'AIDE DE MEULES EN CBN : mesure des contraintes résiduelles par diffraction X

摘要

The knowledge of the residual stress levels of nitrided gear teeth of power transmission system provides information for predicting their fatigue lifetime. In the aim of an improvement of our grinding techniques, the influence of both, the finishing pass depth and the loading of CBN (cubical boron nitride) grinding wheel on the residual stress levels was investigated. The surface residual stresses are in compression and more elevated in the circumferential direction than in the axial one. As the finishing pass depth increases, the residual stresses decrease. The dressing of the grinding wheels during grinding prevent the drop of residual stresses up to 200 N/mm~2 linked to the loading of the grinding wheels. The depth affected by the grinding is 0.01 mm; beyond this depth, the profile is equivalent to a nitriding profile.