Experimental study on process of grinding Al₂O₃ ceramic with resin bond diamond grinding wheel

To enhance the grinding performance on Al₂O₃ ceramics,resin bond diamond grinding wheels are prepared to conduct grinding tests,the grain sizes of which are 125 to 150 μm and 38 to 45 μm respectively.Surface roughness,material removal mode and material removal proportion are studied as the grinding parameters change and the microstructure of alumina ceramics after grinding is observed and analyzed.The results show that the surface roughness of alumina ceramics can reach R_a 0.418 μm and the material removal proportion can reach 95%.When grain size 38 to 45 μm,with cutting depth no more than 2 μm and workpiece speed 0.15 m/min,the material removal mechanism changes from plastic removal to brittle removal.In conclusion,optimized grinding parameters consist of two parts,namely coarse grinding(grain size 125 to 150 μm,cutting depth 4 μm)and polishing(grain size 38 to 45 μm),which could satisfy both requirements on efficiency and precision.