Lipetsk State Technical University (Lipetsk, Russia):

A. P. Zhiltsov, Cand. Eng., Associate Prof.

Donbass State Technical University (Alchevsk, Ukraine):

O. A. Pavlinenko, Assistant, Applied Hydromechanics Dept., e-mail: olia.pavlinenko@yandex.ua
D. A. Vlasenko, Senior Lecturer, Ferrous Metals Metallurgy Dept.
E. P. Levchenko, Cand. Eng., Applied Hydromechanics Dept.

The production experience of using chipped steel spherical fractions during shot blasting and shot blasting operations indicates that a comparison of practical and analytical approaches in substantiat ing the parameters of its preparation is the key to ensuring the necessary quality of cleaning and hardening of the treated surfaces. On the basis of Hertz’s contact theory of impact interaction for elastic bodies, mathematical modeling of the spherical particles splitting process by a central constrained impact is proposed, the dependencies are analytically substantiated to determine the main technical parameters of the splitting process of a steel spherical fraction during impact contact. As a result, regularities are proposed for determining the required contact interaction speeds, mass-size characteristics of the impact element and pellets to provide conditions of guaranteed destruction of the material by a central constrained impact. To confirm the reliability of scientific assumptions and verify the adequacy of the obtained mathematical dependences, experimental studies of the splitting process of spherical steel fractions of various diameters using a laboratory pendulum copra were carried out. After statistical processing of the experimental data using the least squares approximation, a regression dependence of the conditions was obtained for guaranteed splitting of a certain number of fractions of crushed material depending on the speed of the shock elements and the grains diameter.

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