Hardness of metal abrasives

- Nov 03, 2017 -

The hardness of the abrasive requirements may be based on the surface state of the workpiece may be, in general, the hardness value should be higher than the hardness of the workpiece surface HRC3 ~ HRC10, abrasive hardness affect the cleaning speed and effectiveness.

    When the abrasive particles impact the workpiece surface with high-speed motion, the impact kinetic energy applied to them by the device causes some energy to be always consumed on the deformation of the abrasive at the moment of impact and can not be completely transferred to the surface of the workpiece being struck, and the effective effect is not completed. The amount of energy that is consumed depends to a large extent on the hardness of the abrasive.

The so-called hardness, is defined as the ability to resist deformation. The higher the hardness, the greater the resistance to deformation. The greater the percentage of energy transferred to the surface of the workpiece, the more obvious the cleaning effect will be.

    In general, abrasive ideal hardness range should be moderate, excellent and easy to break, too soft and easy to deformation. Some high-hardness abrasives (such as cast iron pills) can be quickly cleaned or strengthened, and their abrasive prices are also low. However, these abrasives are fragile and expensive, which may also lead to premature wearing of the shot peening equipment and increase maintenance costs; on the contrary , And other low hardness abrasives, which have a low rate of consumption and low prices, have long cleaning cycles, low productivity, waste of labor and time. Figure 1 shows the abrasive hardness and the relationship between life and cleaning the surface effect.

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