KSHP. OMD №1-2026

N. M. Bobrovskij, D. A. Rastorguev, R. U. Kamenov, A. V. Savel’ev (Togliatti State University, Togliatti)

Assessment of material machinability in surface plastic deformation targeting the required surface roughness

The article examines the influence of material properties and the characteristics of macro- and microroughnesses of the machined surface on the machining parameters using the method of surface plastic deformation by roller rolling. A comparative study was conducted for aluminum alloy D16T, steel 45 and titanium alloy VT3-1. The relationship between the material parameters (yield strength, modulus of elasticity, hardness), the characteristics of micro- (Ra) and macroroughnesses (waviness with a given wave height and wavelength) and the results of surface deformation is established based on analytical calculation. A calculation method for the depth of plastic deformation is presented, taking into account the specified factors. The plastic properties of the workpiece material, the geometric parameters of the tool, the influence of the macro- and microgeometry of the workpiece are taken into account. The calculation is based on a formula for determining the contact parameters in an elastic formulation with an assessment of the influence of the actual contact area and clarification of the plastic properties of the material. The results of an experimental study of changes in various surface roughness parameters characterizing it in amplitude, axial directions, and from a functional standpoint, before and after machining, are presented. The results of the study allow for the design of a surface plastic deformation process by rolling to achieve the desired surface roughness for various materials.
Keywords: surface plastic deformation; rolling; surface roughness; machinability; D16T; steel 45; VT3-1; plasticity.

V. A. Voitenko (V. Dahl Luhansk State University, Luhansk)

Study of physical processes occurring in a friction clutch with floating friction elements

A new kinematic design for a mechanical engineering clutch is proposed. It contains floating friction elements that, during frictional interaction between the working surfaces of friction pairs, self-align to positions corresponding to optimal conditions for their frictional interaction. A mathematical model is proposed for the process of force interaction between the working surfaces of a friction pair, one of whose friction elements can rotate or pivot around its axis parallel to the axis of rotation of the other friction element. Based on the results of a numerical experiment, relationships were established between the frictional interaction parameters of the friction elements, one of which self-aligns to the optimal position or rotates during frictional interaction.
Keywords: clutch; floating friction element; pressure plate; frictional interaction; torque; friction force.

A. I. Kanareykin (Russian State University for Geological Prospecting (MGRI), Moscow)

Determination of heat transfer in a rod for the case of an exponential law of change in the radius of a section

The article is devoted to the theoretical issues of heat transfer through a rod. The paper considers the case of the exponential law of variation of the radius of the section of the rod. At the same time, there are no heat sources in the rod, as well as in the coating layer. The process itself is stationary. The solution to the problem is given using the method of variable substitution and row division and the application of the Airy function.
Keywords: core, heat transfer, thermal conductivity, cross-sectional radius, Airy function.

O. B. Skvortsov, V. I. Stashenko (IMASH RAN, Moscow)

Electropulse action on metallic materials in metal forming technologies

The mechanisms of pulsed electrical effects on metals and alloys were studied when using the electroplastic effect in the technologies of metals processing by pressure. Based on a retrospective analysis of publications, the prospect of practical application is shown, which is limited to the lack of an adequate consistent description. The analogy in the manifestation of the electroplastic effect and the effect of acoustic softening of metals during their processing shows that the processes of electromy pulse processing can be considered as the conversion of electrical exposure to the shock-wave process in the metal, through which the deformation resistance and microstructural properties are influenced by the resistance of the metal. In favor of such a physical model, the obtained experimental results are evidenced by synchronous measurements of magnetic and vibration processes in metal materials during the exposure of the electric pulse. The results can be used in choosing modes and developing the technology of metals and pressure alloys.
Keywords: electromechanical processing of metals; electroplastic effect; electric current pulse; deformation; impact processes; vibroacoustic response; acoustic softening effect.

I. V. Sevostyanov, V. A. Minaev (Volgograd State Technical University, Volgograd)

Study of the influence of mounting schemes and force impact on deformation and surface quality during mechanical processing

The quality of the machined surface is now an increasingly important factor in meeting the requirements for high performance, durability, and reliability of components. In many industries, structural components are subjected to increasingly severe conditions of contact fatigue, stress, and temperature, while section sizes are being reduced in order to lower weight. Thus, the surface quality of a component, which is largely dependent on external loads and clamp fastening during processing, has an increasing impact on its performance. With this in mind, the article presents an integrated model of the «clamping device-workpiece» system for predicting surface quality. Particular attention in the research process is paid to modeling the force impact on deformation and surface performance during machining.
Keywords: component; machining; surface; load; deformation.

N. M. Bobrovskij, R. U. Kamenov, Yu. V. Titov, D. V. Gulamova (Togliatti State University, Togliatti)

Review of hard and superhard materials for burnishing tools

Surface plastic deformation (burnishing) is a finishing operation used to improve the surface quality of components made of hard and hardened materials. This review focuses on the requirements for burnishing tool materials and analyzes the current state of their development. Superhard materials (diamond, cubic boron nitride, transition metal borides), fine-grained WC-Co hard alloys, and the differences between single-crystal and polycrystalline forms are considered. Requirements for machined surface quality (roughness, residual stresses, microstructure) are systematized, and criteria for selecting optimal materials are developed. Gaps in research on the long-term thermal stability of tools and the relationship between tool material microstructure and machined surface parameters are highlighted.
Keywords: superhard materials; burnishing; surface plastic deformation; tool materials; diamond; cemented carbides; surface roughness; residual stress; microstructure.

A. E. Senner, N. M. Smagin (Dubna State University, Dubna)

Overview of bending methods for «Tube billet» type parts

The article provides an overview of existing technologies for bending parts of the «Tube billet» type – split bushings designed for subsequent welding into a closed cylindrical shell. The main technological principles, areas of application, advantages and disadvantages of the methods are considered. Recommendations are given on the choice of technology depending on the production conditions.

Keywords: pipe billet; bending; sheet stamping; rolling; reversible bending; roller forming.

V. Yu. Pauls (Northern Trans-Ural State Agricultural University, Tyumen)

Materials for refrigeration system components and piping

This paper examines and analyzes materials used to manufacture refrigeration system components and piping. The information presented may be useful for modernizing, improving the reliability, and extending the lifespan of refrigeration equipment.
Keywords: refrigeration systems; materials; physical and chemical effects; safety requirements; refrigeration engineering.