1. The grinding wheel is made of abrasives and bonding agents. The friction between the grinding wheel and the workpiece will generate a lot of heat, and the bonding agent is easy to be softened.
2. The grinding wheel will become a bit dull after a long period of effort. This is mainly due to the friction between the surface particles and the cutting tool during work, which will gradually wear and become blunt. When the grinding resistance exceeds the bonding force between the particles and the binder , The particles begin to fall off and are replaced by new sharp particles.
3. The metal powder to be ground and the bonding agent are bonded and stuffed in the gap between the sand grains to plug the grinding wheel. If you continue to work with this plugged wheel, not only will the work efficiency be quite low, the sharpened tool will also turn blue and cause annealing.
4. On the other hand, if the bonding agent cannot bond the particles firmly, the particles will fall off when they are ground before they become pure, so that the sand transmission line wears quickly and is easily deformed, requiring frequent trimming.