Research on Relationships Between Surface Fracture States and Surface Roughness Dispersion Range in Ultrasonic Grinding ZrO₂

On the basis of the relationship between machined surface roughness and cutting parameters of hard-brittle materials, experiments of common and ultrasonic honing ZrO2 engineering ceramics were carried out using coarse diamond grits to discuss the relationship between surface roughness and its dispersion range and surface fracture states. Experimental results show that the machined surface roughness value of hard-brittle materials and the characteristics of its dispersion range can be considered as the criteria of cutting state. Therefore, as the machined surface roughness value and its dispersion range are both rather small, the cutting goes in the ductile cutting state, whilst the machined surface roughness value and its dispersion range are both rather large, the cutting goes in the crack cutting state. When the machined surface roughness value is rather small and its dispersion range is rather large the cutting is in the transition cutting state.