Wear analysis of tools in cold forging: PVD versus CVD TiN coatings

This new approach is applied to quantify wear of PVD and CVD TiN coated AISI M2 tools used to form a screw head. Friction tests highlight the drift of the friction conditions at the contact interface due to tool surface deterioration. The results show that the CVD coating has to be used to improve the production of the screw head forging sequence.