Definition of mechanical wear of abrasive grains at grinding
Keywords:
mechanical wear of the abrasive grain, the kinetic theory of strength, thermal- fluctuation mechanism of destructionAbstract
Among the different mechanisms of wear of the abrasive tool during the grinding themechanical wear is predominant, those reflected in the form of removal of elementary microvolumes of abrasive material with the working surface of the grains. The nature of forming site on the grain blunting a result of this kind of wear is still not disclosed. The article suggests a kinetic approach to mechanical wear of the abrasive grains in grinding through thermofluctuational nature fracture of solids. It is believed that as a result of multiple quasiperiodic contact between the abrasive and the cutting material in the material of the abrasive grains on the interatomic links arise tension, which serve as an impetus to overcome the energy barrier of atoms and the unit connection can be broken. As a result, in the abrasive material is an accumulation of broken interatomic links, form-by discontinuities and develops the process of destruction. The temperature in this case is too important.
The proposed technique simulation game-stroke interaction between the abrasive grain
and the material, that make it possible to determine a amounts off tension with the grinding grains and the magnitude of the durability of the abrasive material. Recognized, that these amounts depend of the grain size and the blunting area, available on the abrasive grain.
The transition from elementary volumes of abrasive experiencing tension, allows to determine the value of macro-abrasive material, worn as a result of the mechanical interaction with the material being processed. The method of predicting the amount of wear of the abrasive grains in the operation of the grinding wheels of different characteristics in a wide range of process conditions allow to create a new approach to the design of the operations of the abrasiveprocessing – when the tool, with a particular resource of operability is available, and the main task is its efficient maintenance.
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