The article presents a study of the characteristics and technological parameters of bar blanks made of aluminum alloy 7075, depending on the temperature and the forming process. The main goal is to determine the stress-strain state at various temperatures during the production of blanks, which contributes to understanding the mechanism of formation of the structure and properties of bar blanks. To do this, a computer simulation of the process based on the finite element method is used, using the Forge3D software environment. The results obtained confirm the uneven structure in the volume of workpieces, with a pronounced intensity of deformation in the surface layers. The formation of workpieces at different temperatures (200 and 250 °C) showed differences in stress intensity and strain rate, which is important for understanding the processes of formation of microstructure and material properties. Special attention is paid to the influence of temperature on the formation of stresses in the rods, as well as their distribution in thickness and length. The results obtained can be used to optimize the technological parameters of the aluminum alloy forming process in order to improve the quality of the final product and production efficiency. In general, the scientific conclusions of this study contribute to the further development of aluminum alloy processing technologies and their application in various industries.

https://doi.org/10.48081/ALKS6670

2024

Issue 3

In recent years, there has been an active increase in the share of electric vehicles in transport fleets in many countries of the world, which necessitates the widespread introduction of appropriate infrastructure for charging electric vehicles. The deployment of electric charging infrastructure should be carried out in accordance with a strategy that takes into account the territorial possibilities of localization of infrastructure facilities, supply and demand for the provision of charging services, and the behavior of electric vehicle users. The article discusses various models of rationing of electric charging infrastructure, which allow us to determine the need for electric vehicle charging facilities. According to the regulatory model, the demand is determined depending on the number of electric vehicles and the number of electric charging stations. In the model, based on the energy balance, the forecast data for the distribution of electric vehicles for certain regions are determined and then the number and distribution of charging points for a particular year is calculated. At the same time, the number of charging points and electric vehicles correlate with each other using quotas. In the model, based on the parameters of electric vehicles, the need is determined depending on the average values of the mileage of an electric vehicle on a single charge, the weekly mileage of an electric vehicle, km and the duration of one charge. The results of the development of the electric charging infrastructure are presented on the example of the city of Almaty.

https://doi.org/10.48081/WTLR2397

2024

Issue 3

Despite the active development of modern methods of producing parts, the production of parts by casting remains one of the most common and economically profitable. At the same time, modern production places high demands on the quality of cast parts. It is possible to ensure high quality of castings by forming a homogeneous dense structure of the ingot (casting). In turn, these indicators can be achieved by regulating the rate of solidification of the casting and the distribution of alloying elements inside it throughout the volume. One of the promising ways to control the casting structure is casting according to gasified models using inoculators (suspension casting). By using ferroalloy particles in styrofoam models simultaneously with inoculators (refrigerators), the number of crystallization centers and the distribution of alloying elements can be adjusted. One of the important indicators in the production of castings by suspension casting is the absence of defects, chemical heterogeneity, porosity and mechanical properties. These indicators can be obtained using inoculators used in suspension casting. In suspension casting, from the point of view of creating waste-free technologies, the use of various metal wastes during casting is promising: chips, slag components, trimmings, die-cuts, etc. In this project, it is planned through the introduction of inoculators, the use of foundry waste, which will provide the required service and technological properties.

https://doi.org/10.48081/XONO1007

2024

Issue 3

Patterns of changes in the technical condition of components, mechanisms and systems of automobile engines determine the costs of resources and losses associated with maintaining engine performance. Increasing the durability of automobile engines in operation is one of the important factors in minimizing the operating costs of the transportation process. When repairing CPG parts, one of the most expensive and technically complex is the technological process of restoring the “cylinder-piston ring” interface. In order to increase their wear resistance, the development of new effective methods and technologies for the restoration of automobile engine cylinders. This article discusses the main features of modern technologies for restoring crankshafts of automobile engines. The use of an effective technology for restoring worn-out car parts by applying new plasma coatings based on electrical erosion materials is justified. Studies have been carried out on the granulometric composition of the powder obtained by electroerosive dispersion from waste high-speed steel. The study was carried out in two stages according to the Fraunhofer method, i.e. by dispersion in a liquid, followed by background measurement and subsequent plasma-powder surfacing. The moment of friction and grip was studied under increasing load on the mating surfaces of steel balls during sliding friction. The data obtained showed that the use of metal waste as a source of materials for plasma-powder surfacing can solve the problem of resource conservation, environmental protection and the high cost of restoration work on car engines. Phase analysis showed that the microhardness of the coating obtained by electroerosion dispersion increased by 1.4 times, and the strength characteristics of the crankshaft of an automobile engine increased by 2 times.

https://doi.org/10.48081/ATBU2373

2024

Issue 2

Excavators, powerful machines used extensively in construction and earthmoving, utilize buckets for digging, lifting, and material movement (soil, rocks, debris). Traditionally, attaching and detaching buckets involved manual labor (often two or more people), precise alignment, and various tools. This resulted in longer setup times and downtime compared to modern quick-release systems. Quick-release mechanisms, as their name suggests, significantly simplify and expedite excavator attachment changes. These devices considerably reduce bucket installation and removal times from the excavator boom, leading to increased overall work efficiency. This study aims to evaluate the effectiveness of various excavator quick coupler designs through a comparative analysis. Factors like efficiency, reliability, performance, and safety will be assessed. Additionally, the study will investigate user-friendliness by collecting feedback from excavator operators experienced with both mounting methods.

https://doi.org/110.48081/PIJQ7782

2024

Issue 2

The performed studies have shown that there is a problem of mechanical processing of hard-to-process materials, in particular titanium alloys in the conditions of domestic machine-building industries. The most significant problem is the low productivity and high wear rate of the cutting tool when processing titanium alloys. Experimental studies have been conducted on the processing of titanium alloys by high-speed milling. It was found that during high-speed milling at spindle speeds exceeding nshp ≥6000-7000 rpm, wear of the cutting part of the tools is observed. This article presents the results of a study of the tool wear process during processing of titanium alloy VT1-0 using a special computer program DEFORM-3D. For modeling, the following processing modes were introduced n=12000 rpm, t= 1 mm, S=4500 mm/min. As a result, it was found that the intensity of wear depends mainly on the rotational speed of the end mill and the feed. And also, based on the results of this modeling, it is possible to extrapolate the time during which, under this milling mode, the carbide cutting inserts will reach a critical wear value. The research was carried out within the framework of grant № AR19174917 "Research and improvement of the quality of high-speed milling of hard-to-process materials by modeling the process and optimizing cutting modes".

https://doi.org/10.48081/WPVO6004

2024

Issue 2

The aim of this research was to enhance the efficiency of the plasma cutting machine by optimizing the drive's technological parameters. During the cutting process using the "Karplaz" plasma machine at "Classic-B" company, some inaccuracies were identified. In order to improve the machine, the design and features of its parts and assemblies were thoroughly investigated. The results of the conducted literary and experimental analysis showed that the formation of deburring is influenced by the cutting speed of the machine. The drive was calculated and the kinematic pair "gear-rack" was replaced. To avoid the need for expensive field experiments to determine the optimal technological parameters, the Autodesk Inventor Professional 11 software package, which includes a dynamic simulation module, was utilized. This software package allowed for the modeling of toothed pairs with different parameters (modulus m=4 mm, m=2.5 mm). With high accuracy (60c), the software calculated the speeds, accelerations, and the number of contacts that occur in a gear-rail pair during movement. This level of accuracy is crucial for the operation of a plasma cutting machine. Furthermore, the software enabled an evaluation of the efficiency of the upgraded plasma machine design and provided the capability to make necessary adjustments to ensure high cutting quality. Based on the results obtained from dynamic modeling, a full-scale experiment was conducted to validate the correctness of the technical decisions made.

https://doi.org/10.48081/HOVL2374

2024

Issue 2

This article presents the results of an experimental campaign that examined the effect of epoxy resin application on bare carbon textiles. To this end, the experimental campaign was undertaken involving a total of 6 specimens (3 bare textile and 3 coated). The main idea of the research is to examine the effectiveness of epoxy resin application on carbon textiles. The main outcome could be determined as follows: a noticeable reduction in maximum applied load observed by 60% and an increase in modulus of elasticity by 23%, which indicates a significant increase in reliability and robustness. However, the use of epoxy resin is associated with disadvantages, in particular with reduced flexibility, which limits its suitability for curved surfaces. The analysis of the nature of the fracture reveals the rupture of the material as the predominant result, confirming the successful impregnation of the epoxy resin to the textile. These results highlight the potential benefits of epoxy-coated textiles and the importance of considering specific application requirements in practical use.

https://doi.org/10.48081/MTZJ1510

2024

Issue 2

The article is an in-depth analysis of the production process of facing stone from durable rocks, especially granites. He considers not only mining technology, but also the development of new thermal tools used to effectively remove rocks during the processing, grinding and extraction of block stone. Rational methods of processing and extraction of block stone and the design of thermal devices for the destruction of hard rocks during processing and extraction of block stone are described. The methods and tools used to create such structures are discussed in detail, as well as the improved energy characteristics that make them an effective tool in production. This method helps to improve the overall productivity of the mining process by increasing the more accurate and efficient formation of cracks in rocks and, consequently, increasing the productivity of the block stone mining process. This aspect is especially important in the field of surface stone production, which requires high productivity and precision processing of the material. In addition, the analysis and developments presented in the article can significantly improve the efficiency of the mining and processing of rocks, which will contribute to the development of the industry and improve the quality of products. As a working body, a mechanized unit of a stone-cutting machine, new designs of thermal tools with high energy characteristics have been developed and manufactured.

https://doi.org/10.48081/MXXN9552

2024

Issue 2

Тhe protection durability and effectiveness with paints and varnishes is largely determined by the surface preparation quality before painting. The laborintensive work is surface preparing for applying paint and varnish coatings. The cost of surface preparing for painting can amount to 30-50% of the painting work’stotal cost, and in some cases even exceed the painting cost. Rust converters are becoming increasingly recognized in the equipment’santi-corrosion protection practice. Their use makes it possible in some cases to simplify the technology of coloring, reduce labor intensity, improve working conditions, prevent environmental pollution, increase the durability of paint coatings and reduce their consumption. One of the promising types of raw materials for the development of a new rust converter is gossypol resin, which is a large-tonnage waste from the oil and fat industry. The problem of increasing the reliability and durability of structures, equipment and various equipment in the engineering industry has acquired particular relevance at the present stage of production development. For this aim, we have developed a rust converter composition based on gossypol resin. The subject of the study was the regularity and change in the process of restoration and application using a rust converter primer to increase the durability of metal structures of industrial equipment in the machine-building industry and agricultural technology. Conducting scientific research in the direction of expanding the range of rust converters to protect equipment from corrosion is an urgent and practical task.

https://doi.org/10.48081/DCYE4461

2024

Issue 2