KSHP. OMD №7-2025

I. P. Popov, E. G. Dem'yanenko, K. A. Nikolenko, Yu. S. Okhapkin (Samara University, Samara)

Methodology of multi-transition process of drawing spherical thin-walled bottom plates

The article discusses the methodology of multi-transition drawing of spherical thin-walled bottom plates and methods for preventing corrugation. The minimum thickness of the workpiece and clamping forces are calculated to ensure process stability. An approach using various matrices is proposed to improve product quality.
Keywords: drawing; spherical bottom plate; corrugation; plastic deformation; multi-transition process; process stability.

A. K. Teben (MSUT «Stankin», Moscow)

Investigation of force parameters when turning with a cutting tool with wear-resistant coatings

This article presents the results of a study of power parameters during turning with turning tools with carbide plates made of T14K8 with wear-resistant coatings Zr-ZrN-(ZrNbCrAl)N and Ti-TiN-(TiCrAl)N. 
Keywords: force parameters; coefficient of friction; cutting tool; wear-resistant coating.

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

Statistical approach to the problem of structural materials strength

The article is devoted to a statistical approach to the problem of strength of structural materials. To ensure the accuracy of strength calculations and to obtain structures with high reliability at minimal cost, theories of strength and ductility are needed that adequately take into account the properties of structural materials. The paper is considered a statistical approach to the problem of strength of structural materials proposed by Volkov S. D., which combines methods for calculating machine parts and structures for strength, taking into account phenomena that are significantly affected by the structural heterogeneity of technical materials.
Keywords: statistical approach; strength; tension; distribution density; microstress.

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

Determination of heat transfer in a rod for the case of periodic changes in the external heat transfer coefficient using the Mathieu function

The article is devoted to the theoretical issues of heat transfer through a rod. The paper considers the case of periodic changes in the coefficient of external heat transfer. The periodic change in the coefficient of external heat exchange is typical for non-stationary processes, when the heat exchange parameters change over time. The solution to the problem is given using the Mathieu equation. Mathieu functions are mathematical special functions that are periodic solutions of the Mathieu equation. They are used in solving various problems of mathematical physics, in particular, in describing wave motion with elliptical boundary conditions, in studying the phenomenon of parametric resonance, in studying nonlinear oscillations in various branches of theoretical and experimental physics, etc.
Keywords: rod; heat transfer; coefficient of external heat transfer; Mathieu equation; Floquet's theorem.

V. V. Karzhavin, V. Yu. Zhukova (Ural Federal University, Ekaterinburg)

Analysis of the strength of the workpiece in subsequent deep drawing operations

The article considers brittle fracture, which is understood as fracture outside the deformation zone, occurring due to the propagation of a cleavage crack along the generatrix of the product. The study is devoted to products manufactured by the method of multi-pass deep drawing. The factors causing brittle fracture of such products are studied. Recommendations for their prevention are developed.
Keywords: brittle fracture; deformation; stress; drawing; strength.

S. A. Zaides, M. D. Bui (Irkutsk National Research Technical University, Irkutsk)

Determination  stress-strain state of a cylindrical workpiece when straightening a local area with flat plates

To restore the shape of low-rigidity cylindrical parts such as shafts and axles, a new straightening method developed. The essence of this method is preliminary elastic deformation of the workpiece in the central section, followed by strengthening by surface plastic deformation based on transverse rolling of the workpiece with smooth plates. The stress-strain state of parts during editing of the local area was determined using the Ansys Workbench software package. The simulation results showed that to straighten a workpiece with a diameter of 10 mm and a length of 200 mm in the central section, it is necessary that the initial curvature of the part is no more than 2 mm and the width of the flat plates is no less than 40 mm.
Keywords: straightening; cylindrical workpieces; flat plates; stress-strain state; radial force; plastic deformation; yield strength; initial curvature.

V. V. Erofeev (MSUT «Stankin», Moscow)

Analysis of additive manufacturing optimization using SLM technology

The article deals with the possibility of using selective laser melting (SLM, Selective Laser Melting) technology for manufacturing and restoration of complex profile parts, mainly made of hard-to-machine materials. The methodological approach to the realization of the production process on different SLM units is described, including comparison of the applied technologies and technical characteristics of the equipment. Theoretical data, analysis of microstructure and mechanical properties, as well as proposals for improving the efficiency of remanufacturing operations are presented.
Keywords: additive manufacturing; SLM; selective laser fusion; parts restoration; 3D printing; microstructure; digital monitoring; numerical modeling; economic efficiency; Russian analogues; powder materials.

V. V. Erofeev (MSUT «Stankin», Moscow)

Quality control of the surface layer during restoration of complex-profile parts using the method of directed energy deposition (DED)

This paper deals with the problem of ensuring the quality of the surface layer during the restoration of complex profile parts by directed energy deposition, which is one of the technologies of additive manufacturing. The aim is to study the influence of laser cladding modes and powder material feeding parameters on the formation of geometry and properties of the surface layer. Methods of operative control and correction of parameters in the process of cladding are proposed. Experimental data confirming the effectiveness of the selected approaches are given.
Keywords: additive manufacturing; cladding; part remanufacturing; energy deposition; microstructure; digital monitoring; infrared thermography; powder materials; 3D scanning.

V. V. Glebov, A. V. Platonov, M. V. Kangin, V. A. Sharov (Arzamas Polytechnic Institute, branch of the Nizhny Novgorod State Technical University named after R. E. Alekseev, Arzamas); K. A. Shchegletov, I. I. Klokov, E. M. Kangin (Nizhny Novgorod State Technical University, Nizhny Novgorod)

A numerical simulation study of the «fixture-billet» kit during performing a slotting operation on an electric erosion machine (part 1)

The article presents the design of a special device for processing a shaped hole in the workpiece of a body part in an electroerosion treatment machine. Studies of the strength and stability of the «fixture-billet» kit for strength and stability using the «ANSYS» software package have been performed. The dependence of the values of stresses and displacements in the investigated set of «Fixture-billet» on various masses of workpieces was also revealed. The study showed the possibility of using such devices to secure workpieces weighing up to 200 kg. in electroerosion treatment machines.
Keywords: electroerosion treatment; numerical modeling; deformations and displacements; billet basing; adaptation.

A. O. Sapronov (MSUT «Stankin», Moscow)

Investigation of the extrusion process from sintered iron powders using regression analysis and computer modeling in DEFORM 2D

The paper considers the process of extrusion of cup-type parts from high-density powder PZh4M3. The results of the study are presented, including the construction of a regression equation to analyze the influence of key process parameters such as friction force and specific extrusion force. DEFORM 2D software package was used for modeling and analysis, which allows to optimize the process and reduce resource costs. The results of the work demonstrate the possibility of effective application of computer modeling to improve the accuracy and cost-effectiveness of the production of parts from powder materials.
Keywords: extrusion of parts of «cup» type; high-density powder PZh4M3; friction force; specific extrusion force; regression analysis; computer modeling; DEFORM 2D software package.