Abrasive particle size selection mainly considers the grinding efficiency and workpiece surface roughness requirements. Generally, you can choose according to the following points.
① When the workpiece machining accuracy is high, the surface roughness value is low, should choose the abrasive tool with fine grain size. The smaller the abrasive is, the more abrasive is involved in the cutting, the smaller the residual abrasive cutting traces on the workpiece surface and the lower the surface roughness. However, the choice of abrasive size must also be considered in conjunction with the grinding conditions used. Coarser grain sizes can also be used to obtain lower workpiece surface roughness values if the grinding quantity chosen is small and the wheel is finely trimmed.
When the grinding tool and workpiece surface contact area is relatively large, or the grinding depth is relatively large, should choose coarse abrasive. Coarse abrasives have less friction with the workpiece surface and generate less heat. Therefore, when the grinding wheel face is used for plane grinding, the abrasive particle size selected can be coarser than when the grinding wheel periphery is used for plane grinding.