The hardness of the grinding wheel refers to the difficulty of the abrasive grains on the surface of the grinding wheel falling off under the action of grinding force. So, how do we choose hardness? Details are as follows:
1. When grinding soft materials, use harder grinding wheels, and when grinding hard materials, use soft ones;
2. The hardness of coolant grinding is 1~2 small grade higher than that of dry grinding;
3. When grinding soft and tough non-ferrous metals, the hardness should be soft;
4. Compared with circumferential grinding, end grinding has softer hardness;
5. Under the same grinding conditions, the hardness of the resin bond is 1~2 small grades higher than that of the vitrified bond;
6. A softer grinding wheel should be used for grinding materials with poor thermal conductivity;
7. When the speed is high, the hardness can be selected from soft 1~2 small grades.