Proceedings of the National Academy of Sciences of Belarus. Physical-technical series

Scientific and practical peer-reviewed journal

The scientific journal “Proceedings of the National Academy of Sciences of Belarus. Physical-technical series” (“Vestsi Natsyyanal’nai akademii navuk Belarusi. Seryya fizika-tekhnichnykh navuk”) is registered on May 18, 2009 by the Ministry of Information of the Republic of Belarus in the State Registry of Mass Media, reg. no. 391. Periodicity is 4 issues per annum. The area of distribution is The Republic of Belarus and foreign countries (by subscription and by retail).

The Journal publishes the results of research, carried out by The National Academy of Sciences and other Belarusian and foreign scientific institutions or universities in the wide area of scientific physical and technical directions, such as material science, mechanical engineering, power engineering (including nuclear energetics), mechanics, heat- and mass-exchange technologies, informational technologies, electronics, instrument engineering, nanotechnologies, technical diagnostics, non-destructive control, safety of technical-systems and nature objects.

The Journal is included in The List of Journals for Publication of the Results of Dissertation Research in the Republic of Belarus and in the database of Russian Science Citation Index (RSCI), as well as to the international database Сhemical Abstracts, EBSCO (Academic Search Complete database), CNKI (China National Knowledge Infrastracture). One can find contents of the Journal’s issues, as well as abstracts of published articles, at the websites of the publisher (belnauka.by) and of the National Academy of Sciences of Belarus (http://nasb.gov.by/eng).

Number of pages: 88.

The Journal is included in the Subscription Catalogue of the Republic of Belarus: the subscription indices are 74843 (for individuals) and 748432 (for institutions).

Current issue

Vol 70, No 1 (2025)

View or download the full issue PDF (Russian)

MATERIALS SCIENCES AND ENGINEERING, METALLURGY

Analysis of chemical resistance of thermoplastic polymer coatings based on polyolefin in solutions of acids, salts and alkalis

O. R. Latypov, S. A. Yamshchikova, A. V. Antonov, R. R. Daminev, D. R. Latypova, I. S. Turkin, E. I. Israfilov

PDF (Rus)

7-16 72

Ceramic materials based on compositions of modified lanthanum manganite and bismuth ferrite

A. V. Buka, T. V. Kolontaeva, E. M. Dyatlova, I. A. Taratyn, R. Yu. Popov, А. A. Shevchenok

PDF (Rus)

17-27 63

MECHANICAL ENGINEERING AND MECHANICS

Power mode of high-speed extrusion of axisymmetric bimetallic rod products for instrumental purposes

I. V. Kachanov, V. V. Vlasov

PDF (Rus)

28-36 60

Abstract

A mathematical model developed to calculate the force impact on a punch during high-speed impact extrusion of axisymmetric stepped rod tools (punches, pushers, cutters, etc.) is described in the article. The model is based on a twostage transformation, which is implemented according to the scheme “rectangle – square”, “square – circle”. At the same time, the transformation from square to circle is implemented under the condition of equality of cross-sectional areas, which allows keeping practically unchanged the kinematically possible field of slip lines, including velocity and acceleration hodographs during the transformation from plane to axisymmetric deformation. The first transformation in the developed model is accomplished by transforming (adapting) the previously obtained calculation equations for forming a rectangular workpiece into equations for analyzing the force regime during extrusion of a rod tool with a square cross-section at all stages. During the second transformation the obtained equations for the analysis of the force mode of the punch operation at flat deformation of a square workpiece from the condition of equality of squares are adapted for the analysis of axisymmetric deformation on the basis of using the relations D_i(d_i) = 1.128A_i(a_i), A_i(a_i) = 0.886D_i(d_i), in which D_i(d_i) – are the required diameters of circular sections of axisymmetric workpiece which are determined by the known values of sides A_i(a_i) of square sections of the workpiece formed under conditions of flat deformation. The proposed scheme for calculating the power parameters of the highspeed impact extrusion process makes it possible to quickly calculate the power mode of formation for any rod step tool with an axisymmetric (round) shape of the transverse steps, using the classical upper estimation method. Taking into account the correct assumptions, this method is effectively used only for analyzing the high-speed impact deformation of flat stepped rod products. Using the proposed technology methodology, in production conditions, it is possible to quickly recalculate the force mode of shaping from flat to axisymmetric deformation and, on this basis, select the equipment (stamping or crank presses, stamping hammers, etc.) necessary for the implementation of the tool manufacturing process.