Pulse Laser Grinding Processing of Polycrystalline CVD Diamond Coated Cutting Tool Edge with Femtosecond Laser

In this study femtosecond laser was used to conduct further processing of CVD diamond coated cutting tool to realize the tool edge sharpening. Since it has been found in our group that with moderate femtosecond laser irradiation CVD diamond coating shows better crystallinity of diamond structure, a pulse laser grinding technique, aimed to realize the edge sharpening, was innovatively performed on CVD diamond tools using femtosecond laser. Tool edge roundness around 1 μm could be successfully achieved. Moreover, surface modification effects of femtosecond and nanosecond laser in this sharpening processing on CVD diamond were compared with Raman spectroscopy, further showing the great potential of femtosecond laser processing for CVD diamond. Based on this, with femtosecond processing tool edge with high sharpness and hardness could be expected.