KSHP. OMD №5-2025
D. V. Vasiliev, V. V. Kireev, V. A. Zyryanov (Tyumen Industrial University, Tyumen)
Increasing the durability of hobbing cutters based on a progressive cutting scheme and determining the stress-strain state of the cutter teeth
Simulation modeling of the kinematics of the gear milling process can effectively improve the accuracy of gear manufacturing, as well as from the point of view of designing hobbing cutters. The parameters of the cut layers form the basis for predicting the stress-strain state of the cutter tooth. Usually, the methods of modeling the process of processing gears based on simplified cutting schemes are used.
Keywords: gear milling; modeling the cutting process; hard alloy; progressive cutting scheme; stress-strain state.
A. V. Lutyanov (MIREA – Russian Technological University, Moscow)
Features of compressed air flow in bearings with cylindrical supports
The article considers the issue of modeling cylindrical shells during their operation under compressed air conditions, which becomes the basis for calculating the rigidity of the technological system when operating under pressure differences in the technological system.
Keywords: cylindrical aerostatic supports; dynamic viscosity parameters; compressed air pressure; gradient.
Xu Xiaoshu (BMSTU, Moscow)
Analysis of failure and fatigue behavior of aerospace composite shells based on finite element method
In recent decades, composite materials have occupied an important place in the aerospace industry due to their high strength with low weight, corrosion resistance and adaptability to various operating conditions. However, despite all their advantages, composites are susceptible to fracture and fatigue damage. One of the most effective tools for such analysis is the finite element method (FEM), which allows for detailed investigation of complex mechanical processes occurring in composite shells. This article examines the analysis of the fracture and fatigue behavior of composite shells used in aerospace engineering. The results of the study show the importance of using FEM to predict the durability and reliability of composite shells, and the author also provides recommendations for optimizing the design and operation of aerospace structures.
Keywords: composite materials; aerospace engineering; finite element method; fatigue behavior.
L. I. Svistun, A. V. Ozolin, E. G. Sokolov, D. A. Golius (Kuban State Technological University, Krasnodar)
Kinetics of mechanical grinding of tungsten powder in a planetary ball mill
The kinetics of mechanical grinding of tungsten powders in a ball mill was studied in order to determine the optimal grinding modes that ensure a productive process for obtaining tungsten nanoparticles. Mechanical grinding of powders for a duration of 5 min to 20 h is carried out in an AGO-2U planetary ball mill at a planetary mechanism rotation frequency of 800 rpm. The resulting nanopowders are studied using electron microscopy and X-ray diffractometry. It was found that the process of forming tungsten nanoparticles consists of the following stages: plastic deformation, particle welding, crushing of the welded particles, and the dynamic balance stage. The last stage is observed after 2 h of grinding. A further increase in the grinding time does not lead to a significant change in the particle size.
Keywords: mechanical grinding; tungsten; nanopowder; planetary mill.
D. V. Smirnov (Technological University named after pilot-cosmonaut A. A. Leonov, Korolev)
Formation of lanthanum-containing matrix by RMI method
The paper investigates methods of ceramic matrix formation in carbon composite materials using lanthanum for protection against high-temperature oxidation. The focus is on preventing material degradation caused by the formation of hydrolyzable lanthanum carbide. The method of reactive melt impregnation is applied to create matrices based on Zr-Si-La systems with the addition of boron and boron carbide. It is experimentally shown that the samples with LaSi2 are prone to failure due to the interaction of LaC2 with water, while the introduction of boron and the use of preforms with LaB6 pre-incorporated increases the stability of the material. The best results in terms of density, porosity and degradation resistance were achieved when impregnating preforms containing LaB6. Further studies are recommended to optimize phase distribution and gas dynamic testing.
Keywords: composite materials; reaction melt impregnation; lanthanum; borides; high-temperature protection.
G. G. Kiselev, A. Yu. Astrakhansky (Volga State Transport University, Samara)
Fuel consumption monitoring for internal combustion engine power systems of ground-based transport and technological vehicles
Optimization of fuel consumption in diesel power systems used in ground-based transport and technological vehicles plays a key role in increasing economic efficiency and reducing overall operating costs. Monitoring fuel consumption not only identifies potential technical problems and deviations in the operation of a diesel generator set, but also helps to find optimal conditions for its operation. There are many approaches and technologies aimed at optimizing fuel consumption. One of the popular approaches to monitoring is the introduction of flow meters that provide dynamic traceability of indicators.
Keywords: internal combustion engine; fuel consumption; flow meter section; diaphragm with a conical inlet.
A. I. Kanareykin (Russian State University for Geological Prospecting (MGRI), Moscow)
Statistical criteria for the strength of brittle materials
The article is devoted to the statistical theory of strength. It examines the statistical criteria for the strength of brittle materials. The application of the normal law to describe the strength of the samples of the general population is considered. The article also provides an analysis of the effect of stress inhomogeneity on strength.
Keywords: strength; tension; statistical theory of strength; normal distribution law.
A. I. Kanareykin (Russian State University for Geological Prospecting (MGRI), Moscow)
Determination of heat transfer in the rod for the case of a linear change in the thermal conductivity of the coating layer
The article is devoted to the theoretical issues of heat transfer through a rod. The paper considers the case of a linear change in the thermal conductivity of the coating layer of the rod. In this case, the process under consideration is stationary. The solution to the problem is given using the method of variable substitution, series expansion and the application of the Airy function.
Keywords: rod; heat transfer; coating; thermal conductivity; Laplace method; differential equation; Airy function.
A. A. Lim (RTU MIREA, Moscow)
Dynamic dependency graphs for AR-support of FDM extruder assembly
The paper proposes an innovative approach to support the assembly process of FDM extruders using dynamic dependency graphs and augmented reality (AR) technology. A model representing the assembly stages in the form of an adaptive graph is developed, the nodes of which adjust the sequence of operations in real time based on the analysis of typical errors of beginners. An algorithm for transforming a static assembly graph into a dynamic structure with branching integrated into the Unity AR environment is presented. The rules of graph adaptation that take into account the frequency of errors and their impact on the build process are mathematically formalised. An experimental study was carried out, demonstrating a 27 % reduction in assembly time and a 65 % reduction in error rate compared to traditional methods. A software package including a dynamic instruction correction module and AR visualisation is implemented. The results confirm the effectiveness of the approach for personnel training and optimisation of production processes.
Keywords: dynamic graphs; AR support; FDM extruder; adaptive instructions; assembly; optimization; Unity.
I. V. Sevostyanov (Volgograd State Technical University, Volgograd)
Influence of cutting modes on the accuracy of a complex-profile product
Multi-axis CNC machines are widely used to produce complex parts in the automotive, aerospace, and mechanical engineering industries. Most of the research and development in the field of CNC technology has been focused on tool path planning strategies, which are often not related to real machining problems and part manufacturing accuracy. This paper is devoted to the study of the effect of cutting modes on the accuracy of a complex profile product. In the process, the models used to predict the accuracy of part machining are presented and the problem of tool error compensation is formalised. The results of an experiment with hole milling in aluminium are also presented. The results showed that the quality of the workpiece is affected by the cutting and feed rates as well as the milling depth.
Keywords: accuracy; cutting; parameters; hole; tool.