MODELING THE ENERGY INTENSITY OF PLASTIC DEFORMATION OF THE CUTTING SURFACES OF THE CUTTING WHEEL DURING ABRASIVE CUTTING OF PIPES
The features of modeling the energy consumption of plastic deformation of the side cutting surfaces of the cutting wheel during abrasive cutting of pipes are considered. Abrasive cutting of materials, from the point of view of physical processes occurring in the surface layers of the cut workpieces, is one of the most high-temperature and highly plastic machining processes. The deformation process arising during cutting is characterized by the stressed state of the surface layer of the cut workpiece and can be characterized by the presence of both compressive and tensile stresses, the maximum value of which does not always take place on the surface, but shifts into the depth of the formed surface layer of the section of the part and leads to its change. It has been established that the causes of the stress state of the groove section are the inhomogeneity of plastic deformation and local heating of the metal of the surface layer, and in the presence of transformations, the difference in the volumes of the emerging structures. Depending on the cutting conditions, the stress state of the surface layer will be determined either by the dominant influence of one of these factors, or by their joint action. The observed non-uniform distribution of the stress state of the surface layer of the metal is explained by the action of two factors - mechanical (plastic deformation), which induces only compressive stresses, and thermal (heating of the surface layer), which is the cause of the formation of only tensile stresses. The results of the study of the regularities of the process, which determine the energy intensity of plastic deformation during abrasive cutting, are presented. The energy intensity of the process, in turn, has a significant impact on the course of the process, in particular, on the quality and accuracy of products. Analytical dependences of the energy consumption of the cutting process are presented, which subsequently make it possible to develop mathematical models for determining the components of the cutting force during abrasive cutting.