Abrasives are an important raw material for manufacturing grinding wheels, and flap discs are responsible for cutting. Therefore, abrasives must be sharp and possess high hardness, good heat resistance, and a certain degree of toughness.
The hardness of a flap disc refers to the ease with which the abrasive grains on the wheel's surface detach under grinding force. A softer wheel indicates that the abrasive grains detach easily, while a harder wheel indicates that the abrasive grains detach more difficultly. The hardness of the abrasive wheel and the hardness of the abrasive itself are two different concepts.
The same abrasive can be made into grinding wheels of different hardness, depending on the properties and amount of the binder and the manufacturing process of the grinding wheel. The obvious difference between grinding and cutting is that the grinding wheel has "self-sharpening" property. Choosing the hardness of the grinding wheel is actually choosing its self-sharpening property, hoping that the still sharp abrasive grains will not fall off too early, nor will they remain dull after being worn down.
The first step is slitting the flap disc. The width and straightness of the slits directly affect the quality of subsequent production. If the width of the abrasive is the same, the subsequent slitting will be smooth and the abrasive threads will be uniform, resulting in less wear on the machine's inlet and outlet. Conversely, if the width is uneven, it will cause great wear on the inlet and outlet parts, and the inconsistent width will easily cause the circular cutter to deviate.
In addition, it consumes a lot of straight blades and may even cause the cutting to be tilted. A flap disc made by tilting the abrasive fibers will definitely be tilted, which directly affects the performance and lifespan of the flap disc.
