This article explores the dynamic behavior of self-propelled concrete mixers within the longitudinal plane, focusing specifically on the effects of road micro-profiles, represented as a one-dimensional function ℎ(?). The study examines a stationary road micro-profile that remains consistent across different road sections and applies Fourier series to analytically model periodic micro-profiles with arbitrary shapes and irregularities. Through this approach, the research delivers a detailed analysis of how road surface variations impact vehicle dynamics, with particular attention to the fluctuations experienced by self-propelled concrete mixers. A significant observation is the pronounced non-uniformity in motion, particularly when these mixers operate on rough surfaces covered by hard coatings. The findings emphasize the necessity of precise road irregularity modeling to enhance the understanding of the operational conditions influencing self-propelled concrete mixers. In addition, the study offers valuable insights for optimizing vehicle design, improving suspension systems, and ensuring better performance, durability, and efficiency under uneven and challenging road conditions.

https://doi.org/10.48081/IEMN6812

2024

Issue 4

Computer-aided design (CAD) systems are used in various industries in the design and development processes. This system simplifies the design process, thereby saving time and resources. This article shows the design and modeling processes of gears for a vertical-axis wind turbine. Gear pairs are important components of mechanical systems and perform a key function in the operation of various mechanisms. The design and production of gear pairs that provide torque transmission are the basis of the mechanical engineering industry. Geometric calculation of gear pairs can be carried out using SolidWorks software. Solidworks is a CAD software package for automating the work of an industrial enterprise. It is used at the stages of design and technological preparation of production. Provides design of products of any complexity and purpose. The program presents a method for designing gears, which is capable of designing various types of gears based on the original geometric parameters. Naturally, the design process requires user competence in the gear theorem and manufacturing technology. The developed gear pairs can be used in various fields of technology (robots, working machines, vehicles, etc.).

https://doi.org/10.48081/WVJN3057

2024

Issue 4

This article provides an in-depth study of the impact of extruder geometry on its mechanical properties, specifically stress and deformation. The research was conducted in the ANSYS Workbench (WB) software by modifying geometric parameters, including a detailed analysis of the effect of wall thickness on the extruder's mechanical behavior. The results showed that increasing the wall thickness leads to greater structural stiffness, which, in turn, reduces deformation. However, when a certain wall thickness is reached, a reduction in stress is observed. This phenomenon highlights the importance of determining optimal wall thickness values when designing extruders. Changes in wall thickness improve the extruder's resistance to deformation and dynamic loads, significantly enhancing its operational reliability. Selecting the optimal wall thickness increases extruder efficiency and extends its service life. The findings allow for the improvement of the extruder's mechanical properties, strengthening it and ensuring long-term reliability. The research results contribute not only to increasing the efficiency of extruder use in the industrial sector but also to implementing solutions aimed at extending its lifespan, which improves production quality. The methodology presented in the article accelerates the design process, allowing for the development of efficient and economically advantageous solutions. The results provide engineers and designers with concrete recommendations for optimizing the extruder’s structural parameters, which helps enhance production quality and reduce costs.

https://doi.org/10.48081/VPHW5599

2024

Issue 4

This article is devoted to the improvement of the structural scheme of the experimental juicing equipment for juice production at small-scale production facilities. The theoretical analysis of the process of juice pressing on a screw press is considered. The problem of liquid phase rotation from dispersed material using methods of mathematical modeling is described and solved. The principle scheme and characteristics of the press equipment and the principle of its operation are also given. The forces acting on the press equipment and pressure self-regulation mechanism have been determined: Fpres. - pressure force, N; Fsh. - shear force, N; Felas. - elastic force, N. The forces acting on the scheme and any point of the pressure self-regulation mechanism have been determined in connection with the change of the gap between the gape nozzle and the screw winding due to the operation of the press equipment. The proposed methodology of theoretical calculation of the pressing process allows to determine the optimal parameters and press sea buckthorn juice using the proposed structure of the working body. Dependencies (expressions) of the mathematical model are obtained, allowing to determine the optimal values with preliminary consideration of the necessary parameters when strengthening the pressing process. The proposed method of engineering calculation of the pressing process allows to determine in advance the optimal parameters and to create a press of any capacity depending on the production conditions.

https://doi.org/10.48081/BBMZ5380

2024

Issue 4

This paper explores the potential application of a 3-UPU manipulator as a design for a metal 3D printer. To determine the working area of the 3-UPU manipulator, its inverse kinematics were investigated. Using the Denavit-Hartenberg method, the required lengths of the manipulator's prismatic pairs were analytically calculated based on the coordinate system transformation matrices. The obtained results were verified by numerical methods in MATLAB program and the correctness of analytical solutions was confirmed. The study showed that the working area of the 3-UPU manipulator is 800x800x600 mm, which is large enough for metal 3D printers. This work area gives you the ability to print from small parts to large parts as well as body parts. The precise positioning and dexterity of the 3-point manipulator ensures sufficient precision in part production. This working area makes it possible to print from small parts to large parts as well as body parts. The positioning accuracy and dexterity of the 3UPU manipulator provides sufficient accuracy in part production. This accuracy of part fabrication reduces the post-processing time of parts by machining, resulting in less material consumption for chips and wear of cutting tools. This research work can provide a scientific basis to enable the 3-UPU arm to be used in metal 3D printers. Future research following this work is planned to explore issues such as improving the dynamic model of the manipulator and increasing its efficiency by optimizing control algorithms.

https://doi.org/10.48081/DXBY7710

2024

Issue 4

In the modern world, metals play an invaluable role in various industries. Medical engineering has become an important area of development in modern metallurgy. The disadvantage of Ti-6Al-4V alloy is microbial colonization on its surface, as well as the release of toxic aluminum and vanadium metals into the surrounding tissues, so research on improving the anti-corrosion and antibacterial properties of Ti6Al4V alloy is currently a serious problem. Two-component metal coatings based on Cu-Ta and Cu-Nb were obtained by magnetron sputtering with joint spraying of targets made of pure metals Cu, Nb, Ta. It was found that coatings with a thickness of 10 microns demonstrated a different degree of antimicrobial efficacy during two days of testing: the maximum inhibition zone of the Ta-Cu coating reached 24.0 mm for S. Aureus and 17.0 mm for C. Albicans. For the Nb-Cu coating with a thickness of 10 microns, the maximum inhibition zone reached 25.0 mm for S. Aureus and 15.5 mm for C. Albicans. It has been shown that with the same thickness, Ta-Cu coatings are better suited to protect the endoprosthe-sis from microbial infections than Nb-Cu coatings.

https://doi.org/10.48081/IYVG6419

2024

Issue 4

The article presents the results of a study of changes in the properties of brass LAF 94-0.5-0.15 depending on the content of modifying components. Four samples of brass LAF 94-0.5-0.15 with the addition of aluminum and phosphorus modifiers were obtained by casting. The elemental composition of the obtained samples was determined by atomic emission spectroscopy and X-ray diffractometry. Maps of the distribution of modifiers on the surface of the obtained samples were compiled by electron microscopy. The microhardness of the samples was determined. It was found that with an increase in the concentration of the modifier - aluminum, the microhardness of the samples decreases. By changing the content of the constituent components of brass and adding modifying elements to it, it is possible to optimize its reflective and mechanical properties. Homogeneous distribution of modifier elements is shown in a photograph in reflected electrons BSE, obtained with a scanning electron microscope, show that the sample is homogeneous and the modifying elements are distributed uniformly over the entire surface of the sample

https://doi.org/10.48081/RENT3771

2024

Issue 4

The authors analyzed the possibility of involving in the processing of iron–containing waste generated during the production of alumina from bauxite in Kazakhstan using alternative carbon (C and CO) reducing agents - hydrogen (H2) and methane (CH4). This article presents the results of the first stage of experimental studies on the use of coke for the recovery of minerals that make up ferrous sands and dump sludge. It has been experimentally established that the limiting stage of the process is the separation of the formed cast iron and slag, which, due to the high content of aluminum oxides in the slag, does not fully proceed at a temperature of 1200 - 1300 0C, which requires an increase in the temperature of the process to 1400 – 1500 0C and an increase in the amount of lime in ore–coal briquettes. Further research is planned on the recovery of iron from ferrous sands and landfill slurries of alumina production using reducing agents alternative to carbon (coke). The research was carried out within the framework of grant funding from the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan for a competition for grant funding for scientific and (or) scientific and technical projects for 2024-2026 under the project AR23487674 "Integrated processing of bauxite in Kazakhstan with additional iron recovery by alternative reducing agents in the implementation of the low-carbon development strategy".

https://doi.org/10.48081/CIUD1048

2024

Issue 3

This article presents the results of research conducted by the authors in the field of simulation modeling of the extreme loads that occur in the removable equipment of flatcars (railcars) when transporting long-length rail strings (from 800 meters) along curved railway tracks. A preliminary review and analysis of existing methods and calculation techniques showed that, to date, there are no digital calculation models in applied software environments that account for the extreme loads during the transportation of long-length rail strings (from 800 meters) along curved railway tracks. The study proposes a 3D model of removable equipment for flatcars (railcars) in the ANSYS software environment for conducting simulation tests. The results of the simulation testing of an element of the 3D model of removable equipment for flatcars (railcars) in the ANSYS software environment confirmed the adequacy of the 3D model. The research results presented, in our opinion, have significant practical relevance, which will undoubtedly be of interest to engineers and scientists engaged in research in the field of simulation modeling of extreme loads occurring in the removable equipment of flatcars (railcars) when transporting long-length rail strings (from 800 meters) along curved railway tracks in Kazakhstan.

https://doi.org/10.48081/HBOW2195

2024

Issue 3

The conducted research in the conditions of machine-building plants, where busbar punching machines are widely used, showed a problem associated with intensive wear of the busbar punching tool. To solve this problem, surfacing the working part of the busbar punching tool was proposed to ensure increased wear resistance. The surfacing material chosen was ESAB OK Tubrodur 35GM wire, 1.6 mm in diameter, which was surfacing by mechanized surfacing using a protective gas environment. This article presents the results of a microstructural study of the surface of the deposited metal with gas-shielded flux-cored wire Tubrodur 35 GM. This research has been funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP19578884 “ Increasing wear resistance and improving the design of the tool of the busbar punching machine”. The results of the microstructural study showed that the hardness in the fusion zone (from the surface of the fusion zone inward) fluctuates within HV 380 - 342. The structure over the entire cross-section of the sample is homogeneous, consisting mainly of the pearlite quasi-eutectoid - sorbite and framing grain - a small amount of ferrite (P = 90%, F = 10%), and also consisting of quenched sorbite and ferrite. It was revealed that at the boundary of the base metal and the weld seam, the dispersion of the quasi-eutectoid is higher, which may indicate a high degree of supercooling, and, consequently, an increase in its dispersion. To improve the durability and reliability of the busbar punching tool, it is recommended to carry out heat treatment and further study of its microstructure and properties.

https://doi.org/10.48081/PLNE2708

2024

Issue 3