Noncommercial Partnership of Mining Industry Businessmen of Russia, Moscow, Russia:

A. P. Verzhansky, Chief Executive Officer, Professor, Doctor of Engineering Sciences

NUST MISIS, Moscow, Russia:
Yu. F. Nabatnikov, Head of a Chair, Professor, Doctor of Engineering Sciences, kaftmr@mail.ru
M. S. Ostrovsky, Professor, Doctor of Engineering Sciences
Ya. M. Radkevich, Professor, Doctor of Engineering Sciences

In focus are the issues of impact exerted by contact interactions on reliability of mining machines and equipment. The friction interaction under contact of parts worsens performance characteristics of machine components and units. The processes of contact interaction are various: mechanical contact resulting in elastic and plastic deformation of rough surfaces, physical adsorption, chemical transformations, electrical, thermal and diffusion events. The most adverse effect is exerted by the boundary mode of friction. One of the most dangerous processes of contact interaction is fretting. The article describes the mechanism and actuators of fretting. It is shown that development of fretting essentially reduces fatigue resistance of machine parts. Introduction of additive and doping agents in lubricants can greatly change fretting behavior and intensity, and, thus, extend the life of tribo-couplings. Vibrometry tests implemented by the authors had positive effect on fretting. It is also efficient to combat fretting though a correct choice of lubricants. The key requirements for lubricants are low friction factor and higher wear resistance under slow rubbing (of the order of a few mm/s).

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