Effect of oil‐air lubrication on contact temperature and sliding tribological properties.

This paper investigated the effect of oil‐air lubrication on contact temperature and sliding tribological properties. On the basis of heat transfer theory, a numerical simulation model of forced convection was established. Experiments were conducted using the tribology machine. Results show that in oil‐air lubrication, forced convection can significantly reduce the temperature at the contact position. Nonlinear decline and decrease in the descent rate of contact temperature were observed with the increase in convective heat transfer coefficient. The convective heat transfer between friction pairs increased with air supply velocity, whereas the sliding friction coefficient initially decreased and then increased. The friction flash temperature reached its lowest value with proper heat dissipation capacity. With the increase in ambient temperatures of the friction pairs, the sliding friction coefficient decreased, whereas the friction flash temperature increased. Influenced by the oil‐air lubrication heat dissipation in the test, the wear mechanism of point contact sliding friction was abrasive wear. [ABSTRACT FROM AUTHOR]