Factors related to grinding wheels
Mainly the grinding wheel's particle size, hardness and dressing of the grinding wheel.
The finer the particle size of the grinding wheel, the more the number of abrasive grains per unit area of the grinding wheel, the finer the surface of the grinding surface, and the smaller the surface roughness value. However, if the particle size is too fine, the grinding wheel is easily clogged, and the surface roughness value is increased, and at the same time, ripples and burns are easily generated.
The hardness of the grinding wheel refers to the difficulty of the abrasive grains falling off the grinding wheel after being subjected to the grinding force. The grinding wheel is too hard, the abrasive particles can not fall off after being worn, the surface of the workpiece is subjected to strong friction and extrusion, the plastic deformation is increased, the surface roughness value is increased, and the burn is easily caused; the grinding wheel is too soft, and the abrasive grains are easy to fall off. The weakening of the grinding action will also increase the surface roughness value, so choose the appropriate grinding wheel hardness.
The dressing quality of the grinding wheel is closely related to the dressing tool used and the longitudinal feed of the dressing wheel. The dressing of the grinding wheel is to remove the passivated abrasive grains from the outer layer of the grinding wheel with diamond, so that the abrasive cutting edge is sharp and the surface roughness value of the grinding surface is reduced. In addition, the smaller the longitudinal feed amount of the dressing wheel, the more the cutting micro-blade on the finished grinding wheel, and the higher the contour, the smaller the surface roughness value is obtaine