THE EFFECT OF FINISHING ON THE WEAR RATE IN THE INITIAL PERIOD OF OPERA-TION OF CYLINDRICAL TRIBOSURFACES

Increasing the durability of sliding friction pairs parts cannot be possible on a regular basis using more expensive structural materials or, moreover, applying special coatings which are obtained due to using plasma energy or vacuum technologies. It is known that shortening running-in period can significantly increase the surface area and, in addition, provide a more stable operation mode at the stage of the main service life of the product, due to specific conditions and operating modes.
Numerous attempts to access surface roughness parameters corresponding to the roughness parameters formed during normal wear-out period often did not lead to the desired results. As further research in this direction has shown, the time of the run-in period is spent on the formation of the surface layer structure under the influence of specified loads, slippage speeds, initial loads, grades of lubricants, etc. And the steady-state roughness parameters are stabilized only on the substructure characteristic of this pair. In the presented article, an attempt is made to use only the grain size of steel surfaces from the available variety of descriptions of the structural parameters of the parts surface layer. This decision is supported by the fact that the parameter is regulated by GOST 5639-82 (State Standard), and there is a proven method for determining it by using the appropriate hardware. Focusing on the grain size of the tribosurface, it became possible to show the potential of reducing the period of running-in through the conditions of technological influencing factors on the tribosurface.

deformation rate, contact temperature, grain size, running-in period, equilibrium structure