Performance increase of hardmetal cutting tools based on stress-strain strain rate properties of their film

The cutting performance of coated tools can be significantly improved by tailoring the compound film-interface-substrate properties to specific application requirements. In the paper, examples highlight such innovative procedures, facilitating the adaption of cutting conditions to the film properties. The fatigue strength of PVD-films at high strains and strain rates, an important parameter for milling operations, is evaluated by repetitive impacts of various magnitudes and durations. Considering the attained results, the tool wear evolution is described dependent on the cutting speed and the cutting edge entry impact duration. Characteristic application examples are presented in the case of NC milling of a hardened steel.