Evaluation of the determining parameters in the physical modeling of the coefficient of friction in the processes of metal forming

The article presents the results of physical simulation of the sliding friction coefficient using a laboratory tribometer. The following are given: the description of the equipment used, the principle of its operation, the algorithm for carrying out the experimental study, the dependences that determine the main parameters of the mechanical system. The purpose of the study is to evaluate the parameters that affect the result when setting the tasks for metal forming process. In particular, the effect on the friction coefficient of the force acting on the friction pair is studied. The experimental data were processed by statistical processing methods. It is shown that in the steady-state mode of the tribometer operation the obtained values of the coefficient of friction correspond to a multimodule distribution. Based on the correlation analysis, a relationship is established between the values of the force and the coefficient of friction. An empirical dependence of the change in the coefficient of friction on pressure is obtained, the character of which agrees with the results known in the literature. Thus, it is shown that when modeling the coefficient of friction on a tribometer, an important parameter is the pressure acting on the friction pair. An example is given of setting the problem of physical simulation of the coefficient of friction using a tribometer for the process of drawing pipes on a mandrel.