Replace grinding with hard cutting, the main problem embodied in how to guarantee access to the desired surface roughness, shape accuracy and machined surface state. Especially when the feed rate and a smaller depth of cut, the radial force is often greater than the main cutting force and tangential force, cutting precision is difficult to control.

Cutting research shows that the elongation hardened bearing steel is small, low plasticity, easy to form a good machined surface roughness. If the machine has sufficient rigidity and fixtures, under reasonable conditions can achieve cutting hardened bearing steel nano cutting.

When selecting five different hardness gcr15 bearing steel machining found the workpiece hardness exceeds hrc50, the higher the hardness of the surface roughness, the better. This is because when the workpiece is harder than hrc50, cutting force and heat have declined, so the role of thermal expansion and softening effect of the metal cutting process of the workpiece is reduced, helping improve the cutting surface roughness and precision.