G.V. Shadskiy - Dr. Sc. (Eng.), Professor, Tula State University E-mail: chief.gennadiischadscky@yandex.ru I.N. Isakov - Leading Process Engineer, JSC «KBP named after Academician A. Shipunov»; Post-graduate Student, Department «Technology of Mechanical Engineering», Tula State University E-mail: ISAKOVIVAN71@yandex.ru

A.R. Bestugin1, M.B. Ryzhikov2, I.A. Kirshina3, V.G. Svanidze4

1–4 Saint Petersburg State University of Aerospace Instrumentation (St. Petersburg, Russia)

1 freshguap@mail.ru, 2 maxrmb@yandex.ru, 3 zlata@yandex.ru, 4 kurgan78@yandex.ru