The flap disc becomes dull after a period of use. This is mainly due to the friction between the surface abrasive and the workpiece in the work table, which will gradually wear out and become dull. The specific reasons are as follows:

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The flap disc is made of abrasive and bonding agent, and a circular coated abrasive tool with a through hole in the center. The characteristics of the flap disc are determined by factors such as abrasive, particle size, hardness, bonding agent, shape, and size. A large amount of heat is generated by the friction of the workpiece being ground, and the bonding agent is easily softened. The ground metal powder and the binding agent are bonded and packed between the sand grains, and the flap disc is compacted. If you continue to work with this stuffed wheel, not only the efficiency is limited, but the sharpened cutting tool will also be damaged.

On the other hand, if the bonding agent cannot firmly bond the abrasive, it will also fall off during grinding

The surface of the flap disc and the workpiece rub against each other, and then gradually wear and become dull. When the grinding resistance exceeds the adhesion between the grain and the binder, the grains start to fall off and are replaced by new sharp particles, so the flap disc has automatic sharpening performance.