CBN and corundum belts,at the same granularity,were used to grind 45 steel.Their grinding performance were analyzed and compared.Results show that the grinding ratios of CBN belt and corundum belt are 210.4 and 18.9,respectively,which means that the wear resistance of CBN belt is better than that of corundum abrasive belt.It is also found that CBN belt does better than corundum belt in the surface quality of grinding workpiece,while the surface roughness R_a of the workpiece are almost the same,respectively...