G.V. Shadsky – 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» (Tula);  Post-graduate Student, Department «Technology of mechanical engineering», Tula State University E-mail: isakovivan71@yandex.ru