The efficiency of using motor transport largely depends on the operational reliability of its rolling stock. The reliability of motor vehicles depends on their proper design, a justified strategy for maintaining their operability during operation. The implementation of this strategy is largely determined by the use of modern information technologies, which include methods and means of diagnostic forecasting of reliability characteristics (failures) of vehicles. The use of modern technologies in the field of maintaining the operability of vehicles allows us to ensure their safety conditions, increase the degree of use of the durability of components, reduce downtime during repairs, reduce the consumption of spare parts and materials, etc. The paper presents a statistical analysis of the study of failures of elements of tractor vehicles of 2 brands. The studied failures of parts, units and assemblies of tractor vehicles made it possible to determine the laws of distribution of random variables of the emergence of a need for spare parts. The considered reasons for the occurrence of failures of elements and the use of spare parts of tractor vehicles made it possible to establish that the majority of reasons for the occurrence of malfunctions with asymmetric distribution laws reflect the imperfection of the design, violations of technological assembly processes, and the unsuitability of the rolling stock for operating conditions.

10.48081/BGQF1928

2026

Issue 1

The paper considers the effectiveness of the use of composite materials in the construction of a tower crane operating under wind loads. In the conditions of modern construction, increasing the height of buildings and stricter requirements for the safety and reliability of lifting mechanisms necessitate the improvement of structural solutions for tower cranes. As part of the study, a morphological analysis of tower crane structures was performed, which made it possible to justify the choice of rational pipe parameters and promising materials. A toad made of S235 structural steel and a toad made of carbon fiber-based composite material (CFRP) has been compared. The evaluation of the stress-strain state of the structure was performed using analytical calculations and numerical modeling using the finite element method in the SolidWorks Simulation environment. The results of the study showed that the use of a composite material reduces the weight of the toad while reducing maximum stresses by 45-50% and deflections by about two times compared to a steel structure. The data obtained confirm the expediency of using composite materials in the construction of concrete tower cranes to increase their operational efficiency, stability and reliability.

10.48081/BGQF1930

2026

Issue 1

The paper considers the design of a built-up large-module gear with inserted teeth and covers installed on both sides of the rim. The relevance of the study is обусловлена the need to increase the maintainability and service life of gear transmissions through the use of built-up designs while maintaining their structural strength and reliability. A distinctive feature of the proposed design is the absence of force clamping of the teeth by the covers: the teeth are fixed by seating them in the grooves of the gear body, while the covers perform an auxiliary function of limiting axial displacement. An analytical calculation of the fastening elements of the covers was carried out taking into account the action of the axial component of the meshing force as well as the load distribution among simultaneously operating teeth. The strength of the bolts was verified under shear conditions and allowable stress criteria, which made it possible to substantiate their size and quantity. Special attention was paid to the selection of the cover thickness, which was chosen to be minimal in order to avoid interference with the meshing process and to prevent an increase in the gear mass. To validate the results of the analytical calculations, numerical modeling of the stress–strain state of the covers and fastening elements was performed using the finite element method in the ANSYS software package. As a result of the simulation, fields of principal stresses were obtained, demonstrating a low level of stress in both the covers and the bolts. It was established that the adopted cover thickness and selected fastening parameters provide a significant safety margin and do not lead to the occurrence of dangerous stresses. A comparison of analytical and numerical results confirmed the correctness of the adopted calculation scheme and the feasibility of applying the proposed design solution in the design of built-up gears with inserted large-module teeth.

10.48081/BGQF1916

2026

Issue 1

This article is devoted to a new metal–cutting tool developed – a chisel assembly with adjustable topless teeth along a helical line and mud grooves, which provides higher accuracy, durability and quality of the treated surface, the novelty of the design is confirmed by a utility model patent. The new tool provides for: adjustment of the teeth-cutters by moving in the axial direction, Δ is the amount of displacement of the teeth–cutters to increase the diameter for sharpening and mud grooves on the body of the reamer to prevent increased wear and scuffing of the guides; the teeth-cutters of the reamer installed in the grooves with an offset relative to each other along the axis where the first tooth isThe reamer cutter works as a boring cutter, and the remaining chisel teeth calibrate the hole along the helical line.; in order to increase the service life of the incisor teeth, their base and grooves are made at a certain angle ε and θ, in order to compensate for the loss of the size of the incisor in height, the adjustment to a given size is performed with a micrometer nut-limb. To prevent the teeth-cutters from shifting axially from the cutting forces, the following are provided: a split ring consisting of two parts, front and rear longitudinal thrust plates. By changing the working conditions of the guide elements and the structure by making mud grooves and adjusting the teeth of the cutters, wear resistance increases, the quality of the treated surface improves as a result of improved centering of the sweep in the hole, prolong the service life of the cutters and reduce the cost of processing.

10.48081/BGQF1917

2026

Issue 1

The article presents the results of research on optimizing the technological parameters of the grinding process of materials by spring-rotor mills using second-order mathematical modeling. Based on the planning of an experiment with five variable factors, second-order polynomial models were obtained for five key output parameters: fineness of grinding, productivity, drive power, specific energy consumption, and specific metal consumption. Regression equations describing the relationship between the technological parameters and the output characteristics of the process are obtained by the method of a complete factor experiment. A statistical analysis of the adequacy of the models was carried out and the most significant factors influencing each of the output parameters were determined. Based on the analytical solution of systems of equations, optimal values of technological parameters are found that ensure maximum productivity with minimal energy consumption and the required product quality. Practical recommendations on equipment configuration have been developed and acceptable ranges of parameter variation have been determined to ensure the stability of the technological process. The results of the study show the possibility of increasing productivity by 15-20% while reducing energy consumption by 8-12% compared to empirically established operating modes. The obtained models and optimization techniques can be used to improve technological processes at bulk material processing plants.

10.48081/BGQF1914

2026

Issue 1

This study investigates the formation mechanisms of the nanocomposite structure of TiSiCN coatings produced by reactive plasma spraying using mechanically activated TiCN–SiC–Si powder mixtures. Particular attention is given to the influence of plasma process parameters, especially arc current, on the phase composition, microstructure, and density of the resulting coatings. X-ray diffraction and scanning electron microscopy analyses reveal that increasing arc current intensifies particle melting and reactive interactions within the plasma jet, leading to reduced porosity and formation of a dense and structurally homogeneous nanocomposite structure. The coatings are shown to consist of Ti(C,N) nanocrystallites uniformly distributed within an amorphous silicon-containing Si₃N₄/SiC matrix. Mechanical activation of powders plays a crucial role in enhancing phase homogeneity, intensifying reaction processes, and suppressing grain growth. The obtained results expand the understanding of structure formation mechanisms in thick TiSiCN coatings and confirm the effectiveness of reactive plasma spraying for producing wear- and heat-resistant protective coatings used in energy and mechanical engineering applications, ensuring improved operational reliability of industrial components.

10.48081/BGQF1920

2026

Issue 1

This article presents the theoretical dependence of the traction capacity of the drive drum of the belt conveyor on various factors with a variable coefficient of friction. The article provides an analysis of existing methods for calculating the traction capacity of the drive, which showed that the main thing is the correct choice of a reasonable value for the adhesion coefficient. The adhesion coefficient is taken from the recommendations based on the results of experimental studies. These values, presented in tabular form, do not take into account the full range of factors that affect the transmission of traction force to the belt by the drive drum, in particular the design parameters of the conveyor drive (drum diameter, belt width, lining thickness), the physical and mechanical properties of the belt and drum lining, as well as the modes of operation of the conveyor (belt speed). Studies show that the amount of traction with an increase in the radius of the drum or the width of the tape increases quite intensively according to a law close to linear. So, with an increase of one of these values by 5 times, the traction capacity increases by about 2.9 times. A less significant effect on traction is the change in stiffness of the belt E0. With an increase in E0 by 10 times, the traction capacity decreases by 2%. The amount of pulling power increases rapidly with the relative sliding angle of the belt.

10.48081/BGQF1931

2026

Issue 1

The studies carried out to analyze the current state of gear manufacturing in domestic machine-building enterprises have shown that there are problems associated with ensuring quality during gear cutting, as well as high production costs caused by significant consumption of cutting tools. This paper presents the results of an experimental study of the thermofriction milling process with pulsed cooling applied to the tooth roots of spur cylindrical gears. The thermofriction milling method with pulsed cooling is a resource-saving technology, since the friction milling cutter is manufactured from structural steels, which significantly reduces the cost of mechanical machining. The experimental results demonstrated that high surface quality parameters can be achieved at optimal cutting conditions. It was established that an increase in spindle rotational speed has a positive effect on the roughness and hardness of the machined surface. At the same time, the influence of feed rate is dual in nature. With an increase in feed rate, the hardness of the machined surface increases and reaches HB 380. However, an increase in feed rate also positively affects surface roughness, providing values of Rz = 40–18 μm. Based on the obtained results, the following optimal cutting parameters were determined: spindle speed n = 1250 rpm; feed rate S = 100 mm/min; depth of cut t = 22.5 mm. The proposed disc-type module friction milling cutter replaces the conventional disc-type module cutter made of high-speed steel R6M5 in the gear cutting operation.

10.48081/BGQF1918

2026

Issue 1

Research conducted in the conditions of domestic machine-building industries has shown that one of the main factors leading to an increase in the cost of machining parts is the excessive consumption of metal-cutting tools due to their premature wear. The solution to this problem may be the development of a method to increase the wear resistance and durability of a metal-cutting tool, as newly acquired before it is used in mechanical processing, as the after overworking the restored one. This article presents the results of a study on the formation of a hardened secondary contact structure on the working surface of a tool after running-in, which is recommended as a way to increase the wear resistance and durability of a metal-cutting tool. It was found that the optimal pre-working modes of the tools provide the best deformation and thermal conditions for hardening the cutting part of the tools. The results of the study showed that, indeed, after running-in, a hardened layer forms on the cutting part of metal-cutting tools. It was found that the thickness of the hardened layer of the cutting part of the disk modular milling cutter is 0.41 mm, the cup cutter is 0.33 mm and the end milling cutter is 0.37 mm. A comparison of the results of experimental, computer and metallographic studies confirmed that after running-in, the cutting part of the tool hardens.

10.48081/BGQF1919

2026

Issue 1

This article presents the results of differential thermal analysis (DTA) of charge materials for the production of silicon carbide from man-made and natural waste. Microsilicon formed during the production of siliceous grades of ferroalloys is the main source of silicon, which, with a sufficient content of SiO2, can replace. quartz sand used in the traditional silicon carbide (SiC) production technology. Petroleum coke is used as a reducing agent for silicon from the composition of microsilicon. The silicocarbon obtained after the pyrolysis process of rice husks serves as a single charge for the synthesis of SiC, since it contains SiO2 and C. To fully determine the formation of SiC, charge materials require careful study in order to describe and characterize phase transformations during heating. In order to determine the physico-chemical properties, during heat treatment, the charge materials were examined for DTA in the temperature range of 30-1250 °C. The obtained results of thermal analysis provide an opportunity to potentially evaluate the process of silicon carbide synthesis.

10.48081/RTXQ4080

2025

Issue 4