R. Kuzminskyi, O. Sokolovskyi, R. Lozovyi, R. Sheremeta, V. Zholobko
Abstract. The article analyzes the influence of steel surfaces processing quality on the value of sliding fric-tion coefficient of Robusta and Arabica coffee beans at dry and lubricated fricbica. The research obtained coffee dry and lubrication functions and parameters of sliding friction coefficients distributions and mathematical models for determining the index which depends on the roughness of steel surfaces.
Key words: coffee beans, steel surfaces, roughness, dry friction, sliding friction coefficient, lubrication.