When selecting the abrasive grain size, it should be selected mainly according to the requirements of processing precision, surface roughness and grinding efficiency. The general principles are as follows:
It is required that the workpiece to be ground has a high roughness, and the coarse grain size should be selected; the surface roughness is required to be low, and the fine particle size should be selected.
When the workpiece requires high geometric accuracy and low surface roughness, the mixing particle size should be selected.
The geometric accuracy of the workpiece is high. When the contact area between the grinding wheel and the workpiece is small, the fine particle size should be selected. When the contact area is large, the coarse particle size is selected.
The workpiece material is hard and brittle, and the fine grain size should be selected; the workpiece material is soft and tough, and the coarse grain size should be selected.
The workpiece has poor thermal conductivity, is prone to heat deformation, and is prone to burn. The coarser grain size should be selected.