Load-carrying capacity of oils for rolling mills

This article reports on an investigation of the loadcarrying capacity of the compounded oils Pp-6, Pp-17, and Pp-28 that have been developed for liquid-friction bearings (LFB) as compared to nonadditive oils. A PZhT-140-300 single-roll stand for the lubrication of a regular-production PZhT-180 bearing was used in the study. The load/sliding speed curves obtained from the test oil were compared with the theoretical curve for the load-carrying capacity of the LFB for nonadditive oil and the curve obtained for the oil base stock at the corresponding viscosity level. It is determined that the compounded oils examined are 15-25% better in terms of load-carrying capacity than the oil base stocks, and 20-25% better than the nonadditive oils. The results demonstrate that the introduction of additives increases the load-carrying capacity of oils for LFBs in rolling mills by 20-25%, depending on viscosity.