Grinding is a very complex process, so it has not yet formed an everything the grinding wheel  phenomenon unified theory after long-term observation and research, mainly there are three:
The mechanical grinding theory: that the cerium oxide particles, cutting with the CG cutting of the abrasive wheel  particles.
The chemical action Theory: protrusion peak portion of the glass serrated layer is removed by hydrolysis.
Hot surface flow theory: the frictional heat caused by hot melt flow, resulting in a smooth surface.