Abstract: The influence factors of ultra-precision grinding of brittle materials are investigated theoretically. And the various experiments on the influence of surface quality are preformed. The experimental investigation on the grinding of brittle materials is carried out. It is shown that the surface roughness is mainly related to the average grain size. In the case of vs＝1200m/min, f＝0～200μm/r, ap＝0.1～10μm, only when the average grain size of the diamond wheel is less than 20μm, the smooth high quality surface can be obtained under grinding in the ductile mode.

Key words: Brittle materials, Diamond wheels, Grinding in the ductile mode, Ultra-precision grinding machining