CONTACT-HYDRODYNAMIC MODEL OF FRICTION IN COLD ROLLING OF STEEL

O. P. Maksimenko, A. V. Nikulin, D. I. Loboiko

Abstract


On the basis of the previously obtained theoretical curve of the dependence of the friction coefficient on the sliding speed, in this work, it is compared with the experimental studies of A.P. Grudeva, V.K. Belosevich. As a result, we came to the conclusion that the basis for studying the friction mechanism during cold rolling with technological lubrication can be a contact hydrodynamic model of friction. This model considers the mechanism of lubrication action and friction under conditions of heavy loaded contact with thin film lubrication.

The aim of this work is to study the friction coefficient during cold rolling of steel from the standpoint of the contact-hydrodynamic theory. In this work, a non-monotonic function is derived that describes the change in the friction coefficient in a heavily loaded contact and a program has been developed for the joint solution of this equation and a contact-hydrodynamic model of the lubricant layer thickness by the method of successive approximations in order to determine the friction coefficient. The results of calculating the friction coefficient and its comparison with experimental data during cold rolling with the use of technological lubrication according to the method proposed in the work showed that the calculations according to the proposed method give results somewhat lower than those of A.P. Grudev, but higher than the values obtained by V.K. Belosevich. Calculations of the friction coefficient using the formula of V.A. Nikolaev and according to the proposed method are quite close. This will make it possible to use the proposed technique when determining the coefficient of friction under conditions of contact-hydrodynamic friction.

As a result, it can be noted that, based on the study of the thickness of the lubricant layer in the deformation zone and experimental data associated with friction at the contact of the metal with the rolls, as well as the analysis of the contact-hydrodynamic theory, a method was developed for determining the friction coefficient during cold rolling using technological lubricant.


Keywords


friction coefficient; contact hydrodynamic theory; lubrication; cold rolling

References


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DOI: https://doi.org/10.31319/2519-2884.tm.2020.6

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Copyright (c) 2020 O. P. Maksimenko, A. V. Nikulin, D. I. Loboiko

ISSN (print) 2519-2884

ISSN (online) 2617-8389