Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

D. V. Terentyev, Cand. Eng., Associate Prof., Chair of metal forming machines and technologies, e-mail: ktnterentyev@mail.ru
N. N. Ogarkov, Dr. Eng., Prof., Chair of metal forming machines and technologies
S. I. Platov, Dr. Eng., Prof., Head of the Chair of metal forming machines and technologies

South Ural State University (Chelyabinsk, Russia):
A. V. Kozlov, Dr. Eng., Prof., Chair “Machine-building technology, machine tools”

The paper presents the results of theoretical and experimental studies of the lubricating film thickness in friction units. The authors proposed to take into account not only the parameters and operating conditions of these units, but also the oil absorption of sliding rough surfaces which has a significant effect on the lubricant pumping ability in the contact zone, and, accordingly, on the lubricating layer formation. The adequacy of the obtained dependence to determine the thickness of the oil film between the friction unit contacting surfaces has been confi rmed by experimental studies. A heavily loaded friction couple, a roller-roller pair, has been used for physical simulation of the lubricating film formation. The studies have been carried out using a SMTs-2 friction test machine, weight loss method, and analytical balance with measurement accuracy of 0.0001 g. The conducted experimental studies showed a convergence with theoretical results at the level of 80–95% that speaks about the satisfactory adequacy of the mathematical dependence. The results of the study enable to predict the friction mode occurring in heavily loaded bearing and gear assemblies of metallurgical plants.

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