Glass molding has now become a popular method for mass production of optical lens. As an excellent mold material

binderless tungsten carbide has high hardness

strength

conductivity and thermal conductivity. However

due to its high brittleness

the binderless tungsten carbide is prone to cracking and breaking during processing

which making it difficult to obtain good surface quality and shape accuracy. In this paper

a high-speed scratching experiment was performed on an ultraprecision single-point turning machine. Scratching under linear velocities of 1m/s

5m/s

10m/s， and 20m/s were used to study the influence mechanism of the linear velocity on the removing form of tungsten carbide. Then ultra-precision grinding of tungsten carbide was carried out to study the surface morphology and sub-surface damage. Moreover

mechanical chemical grinding fluid is introduced to study its positive effect on the ground surface morphology of tungsten carbide. A water-based grinding fluid containing mass fraction 1% silicon oxide nanoparticles and 3% hydrogen peroxide was adopted during grinding. Finally

the surface morphology from mechanical chemical grinding was observed.