Abstract
The article says that when friction occurs, complex processes occur in the submicroscopic and in the macro, micro volume of the rubbing surfaces. The formation of physical relief and surface connections depends on the macro, micro and submicroscopic parameters of the conjugated bodies. These indicators determine the actual contact area, the intensity and property of elastic-plastic shear, adsorption, diffusion, heat generation and other conditions at the contact site. When designing friction unit parts in various branches of mechanical engineering, instrumentation, and it is also important to know the effect of friction of materials of different strengths on the actual contact area on the pattern of formation of the external friction force. Based on research by scientists on the role of large-scale impact in the process of external friction, it is proved that wear resistance depends on the scale factor. In the manufacture of friction units of machine parts, the influence of the scale factor on the force was taken into account (coefficient) of external friction and the amount of wear. This is due to the optimized anti-friction and wear-resistant properties of materials and sizes of nodes in motion. Therefore, it was found that it is better to carry out calculations of a constructive nature, which allows you to increase the strength and reduce the weight of the structure.