(1) The material of the gear to be ground is usually various grades of hardened alloy steel and high-speed steel. The material of the gear grinding wheel should be white aluminum oxide, pink fused alumina, or a mixed abrasive of the two.
(2) The higher the hardness of the gear tooth surface, the smaller the surface roughness parameter value, the softer the hardness of the gear grinding wheel should be and the finer the grain size. When the precision required for the gear to be ground is very high and the grinding allowance is large, it is best to use gear grinding wheels of different grain sizes and hardnesses for rough grinding and fine grinding respectively.
(3) When grinding with a profiled grinding wheel, a softer gear grinding wheel should be used to avoid surface burns; using a CBN grinding wheel can greatly extend the life.
(4) When dry grinding, the heat dissipation conditions are poor. The selected gear grinding wheel should be softer, coarser, and looser in structure, but its effect on the roughness of the gear tooth surface should also be considered.
(5) When grinding with a worm grinding wheel, in order to ensure the tooth shape accuracy, the smaller the module of the gear, the finer the grain size of the grinding wheel should be and the higher the hardness should be.
