This article presents the calculation and justification of the parameters of a mixing device based on a three-bladed agitator designed to supply a solid powdered active substance evenly distributed in an aqueous medium. To select the optimal parameters, the geometry of the agitator was calculated according to RD 26-01-90-85 for an apparatus with a diameter of 1000 mm and a height of 1270 mm, which corresponds to the capacity of the mixing device equal to 1 m3. The diameter of the agitator was dм = 700 mm, the width of the blades of the agitator was h = 140 mm, and the diameter of the sleeve in dвт = 120 mm. The angle of inclination of the blades is 45 degrees. The calculation data was used to create a solid-state model. The drive power is 3,2 kW and the rotation speed is 75 rpm. The agitator model was uploaded to the Ansys Student (CFD) program, which uses the finite element method (FE), to visualize, analyze, and determine the performance characteristics of the agitator model based on the nature of the fluid flows that occur. The proposed modeling technique using CE made it possible to evaluate the efficiency of mixing, the distribution of flow velocity and the level of turbulence in the volume of the mixing device.

https://doi.org/10.48081/OBMJ3120

2025

Issue 2

This paper analyzes information on casting silicones used in the manufacture of molding tooling for casting polymer concrete products. Characteristics of different types of silicones are described, including Shore hardness, elongation at break, linear shrinkage and other properties affecting accuracy, wear resistance and quality of castings. Laboratory tests of five brands of silicones: Silagerm 5045, Silagerm 6070P, Pentelast 710, SilcoTin 40 and PolyFlex 80 are carried out. Test methods are presented, as well as a comparative analysis of the results obtained. The aim of the work is laboratory determination and comparison of physical properties of materials used for creation of injection molds for various purposes. On the basis of experimental data recommendations are given on the choice of silicone depending on the scale and configuration of products. For small-sized molds it is suggested to use softer compounds, while for large-sized ones - silicones with increased hardness. The work can be useful for specialists engaged in the development and operation of molding equipment in the field of molding from polymeric materials. After the "silicone sheets" had cured, the desired shape was cut out of them for a tear test in the form of a double-sided shovel. And the remaining part of the sheet was used to determine the Shore hardness.

https://doi.org/10.48081/PILO7158

2025

Issue 2

This article presents the results of experimental research aimed at improving diagnostic methods for braking systems in heavy-duty trucks. The relevance of the topic lies in the fact that most current diagnostic procedures are carried out under conditions far from those encountered in real-world operation-specifically, without load, although trucks rarely operate in an unloaded state. Under such testing conditions, evaluating braking efficiency based on specific braking force often proves inaccurate, which may lead to false conclusions regarding the technical condition of the vehicle and pose risks to road safety. To address this issue, a new design of a roller test stand was developed. The stand simulates actual axle loads through the use of electric winches and a pressure system. The conducted experiments demonstrated that the application of additional load significantly increases the reliability of measurements, reduces data scatter, and provides a more objective assessment of the braking system's condition. The findings suggest that this method should be integrated into regular vehicle inspection procedures. The proposed development can be employed in modernizing diagnostic equipment and updating regulatory frameworks, ultimately contributing to improved accuracy in brake performance evaluation and higher levels of transport safety.

https://doi.org/10.48081/JOWL5203

2025

Issue 2

The article presents an experimental study of the effect of welding welding wire Sv10H17T on the tribological properties of steel samples. The relevance of the work is related to the need to increase the service life of parts operating under friction conditions, while reducing the cost of their maintenance and repair. The authors conducted comprehensive laboratory tests using various conditions: dry friction, friction in aqueous and oil-containing media. During the experiment, the coefficient of friction, the moment of friction, the temperature in the contact zone, mass loss, wear depth, microhardness of the surface before and after testing, as well as roughness were measured. It has been found that surfacing improves wear resistance, reduces friction, and increases the microhardness of the surface, especially in conditions of prolonged contact without lubrication. Microstructural analysis confirmed the formation of a stable riveted layer with deformation hardening and partial heat treatment. The results show that surfacing makes it possible to restore or even improve the original properties of materials, providing a longer service life. The work has practical value and can be used in the field of mechanical engineering and equipment maintenance, including repair of turbines, gearboxes, bearings, gears and other components.

https://doi.org/10.48081/RJVH2012

2025

Issue 2

This article is the twelfth publication within the framework of the implementation of the program “Development of a Prototype of a Modernized Border Vehicle to Enhance the Efficiency of Operational and Combat Tasks in the Protection of the State Border of the Republic of Kazakhstan,” funded by the Committee of Science of the Ministry of Science and Higher Education of the Republic of Kazakhstan (BR218010/0223). The article outlines and justifies the necessity and concept of developing a prototype of a multifunctional border vehicle to improve the effectiveness of border protection tasks within the “Smart Border” concept and the creation of mobile and efficient response forces for the Border Service of the National Security Committee of the Republic of Kazakhstan (NSC RK). It also presents the idea of developing a second experimental model of a special border vehicle. The Border Service of the NSC of the Republic of Kazakhstan (hereinafter referred to as the BS) faces the challenge of increasing the efficiency of state border protection, capable of countering various threats and challenges in the border space on a qualitatively new level. Achieving this goal is extremely difficult without research and the application of innovative technologies. Therefore, one of the relevant aspects of improving border security is the integration of the “Smart Border” concept into the operations of border units, as well as the development of mobile and effective BS response forces. The successful implementation of this concept heavily depends on the development of a range of vehicles and mobility-enhancing tools for the BS units directly responsible for protecting the State Border.

https://doi.org/10.48081/BYID3394

2025

Issue 2

This paper presents a mathematical model of adaptive control for a hybrid crank press with feedback. The dynamic model of the press includes both mechanical and electrical components, and real-time changes in system parameters are taken into account. An adaptive control law is proposed, based on parameter identification methods and adjustment of the control action depending on the current state of the press.The stability of the system was analyzed, and the advantages of the proposed approach over classical control methods were demonstrated. The article considers methods for synthesizing control systems for solving tracking problems in multidimensional stochastic models operating under conditions of incomplete information about the object's state and parameters. The design of control systems is carried out through gradual addition and complication of the methods and algorithms used: from optimal control for deterministic models to adaptive tracking systems for stochastic models with incomplete and noisy measurements. The primary research method used is simulation modeling. The results of modeling confirm the effectiveness of the developed control system under varying loads and external disturbances. The proposed system demonstrates high stability and the ability to adapt to a wide range of operating conditions.

https://doi.org/10.48081/ZMYU5973

2025

Issue 2

Studies of the influence of working conditions on the efficiency of operation of mine dump trucks were carried out. The peculiarities of operation of mine dump trucks during ore transportation from deep quarry horizons are taken into account. As the analysis of mining and transportation operations in quarries shows, there is great potential to improve efficiency and reduce the cost of mining and transportation operations. An important opportunity to reduce the cost of mining and transportation operations in quarries is the efficient organization of a fleet of excavators and cars in terms of optimizing the total size of the fleet and the number of dump trucks that come into shift. An important potential for reducing the cost of mining operations at the quarry is the efficient organization of the excavator and automobile fleet in terms of optimizing the total number of the fleet and the number of trucks leaving for shift. Analysis and studies of the condition of freight transport show that in order to ensure the planned motor transport operations in the amount of 75 million tons per year, it is not necessary to maintain a fleet of 30 or more truck dump trucks, enough Komatsu truck dump trucks 630E subject to the relevant mining conditions at the quarry. One of the possible directions for increasing the efficiency of the mining and transport complex, which requires additional research, is the use of combined road transport in terms of "face - loading warehouse". This approach involves the use of Komatsu 630E truck dump trucks in lower horizons with overloading on a large-sized BelAZ-75135 dump truck, which is most adapted to existing conditions.

https://doi.org/10.48081/IGZX1760

2025

Issue 1

The article analyzes the formulation of a one-dimensional problem of plastic deformation of the deposited layer of the surface of parts during rolling with a cylindrical roller. The method of finishing and strengthening the surface of parts using rolling in the surface of parts with steel cylindrical rollers ensures the formation of low roughness, residual compressive stresses in the surface layers and fine-grained structure by depositing metal in thickness in the seam area to create plastic elongation deformations in the longitudinal and transverse directions. When finishing and strengthening the surface of parts using running-in, it is characteristic that the deformation of metals during processing at high temperatures is determined by the significant influence of deformation rates on stresses. This dictates the need to calculate stresses and strains based on the equation of state of rheonomic bodies. The purpose of the study is to determine the stress components and force factors of the technological process of finishing and strengthening surface treatment of parts based on the numerical solution of a one–dimensional nonlinear problem involving the calculation of the stress-strain state in the deformation focus based on the theory of creep. The article examines the process of deformation of a material under the action of an absolutely rigid cylindrical body (roller) performing a plane-parallel motion. It is established that the complete elimination of residual deformations is achieved if the plastic elongation deformations created by running-in in the layer and adjacent sections of the base metal turn out to be equal in value to the residual plastic shortening deformations in these zones. It is determined that the residual longitudinal stresses in this case may be close to zero. In the one-dimensional formulation of the problem, relatively general formulas are obtained for calculating the stress-strain state, pressure and friction forces on the contact surface, forces and moments acting on the roller.

https://doi.org/10.48081/RUMT3420

2025

Issue 1

The use of sand and resin molds in foundry has been known since the sixties of the last century. This shape makes it possible to obtain castings with high surface purity and high dimensional accuracy and casting geometry. Also, sand-resin forms have a long life, low hygroscopicity and a number of other advantages. The widespread introduction of shell forms into production was hindered by two of their drawbacks - the formation of harmful emissions when heating a thermosetting resin - ammonia, phenol and the relatively high cost of the resin. The elimination of both shortcomings was previously proposed by the team of authors of this project, possibly when used simultaneously with the thermal effect on the mixture of static pressure. The use of molds from sand-resin mixtures ensures the production of high-quality castings. Increasing the efficiency of the casting process makes it necessary to improve the technology for manufacturing casting molds. In this regard, studies aimed at improving the technological process that ensures the regulation of the properties of the form and their uniformity throughout the volume are relevant. It is possible to increase the degree of control of the parameters of the manufactured shell mold. Considering the change in the state of aggregation of the resin during the formation of the shell (solid - liquid - solid), it is advisable to change the pressure value (that is, use a variable pressure value).

https://doi.org/10.48081/FPGE1681

2025

Issue 1

It is known that reindeer antlers are recognized raw materials for obtaining medicines and the only complex of animal origin in the world with powerful preventive and health-improving effects. Scientists have extracted various biologically active compounds such as peptides, lipids, polysaccharides, proteins, nucleotides, glycoproteins, and trace elements from deer antlers. However, the nutrient composition of velvet deer antlers has received limited attention as a potential bioactive resource. The study of the bioactivity of blood and antlers is crucial for expanding their application in functional foods and nutraceuticals. Therefore, attention should be paid to in-depth scientific research of the unique compounds of domestic deer antlers to develop new high-quality and safe health products. This article presents the results of a study to determine the chemical components of deer antlers from the Borovoye area of the Akmola region. The examined antlers revealed a high content of protein (16.45%), fat (26.01%), calcium (355 mg/100 g), phosphorus (5662 mg/100 g), and B vitamins. The safety of antlers is confirmed by the absence of pesticides, radionuclides, coliform bacteria, sulfite-reducing clostridia, Staphylococcus aureus, yeasts, and pathogens.

https://doi.org/10.48081/EPCD3886

2025

Issue 1