Mechanical Engineering Products Research Articles

Identification of structural defects and their impact on the magnetic memory, static and cyclic strength of VNS9-SH thin sheet trip-steel

Identification of microstructure defects, which are stress concentrators (SC) during the operation of mechanical engineering products, is an important scientific and practical task relevant for manufacturing enterprises. This problem becomes especially urgent and difficult for critical helicopter parts made of sheet TRIP steel VNS9-Sh (23Kh15N5AM3-Sh) and operating under cyclic loads due to the complex microstructure of the steel and small thickness of strips and sheets. To assess the impact of structural defects on the cyclic strength of products made of the steel under study, the specimens were preliminary sorted proceeding from the results of their testing using the method of metal magnetic memory (MMM) and metallographic studies. The MMM method is a structure-sensitive procedure which provides information about the presence of structural defects that arise during the manufacture. Magnetic anomalies in the form of sharp local changes in the intrinsic stray magnetic field (SSMF) (H) and its gradient |ΔH| along the length of the controlled section Δx, were identified on the surface of sheets cut from five different batches. A conventional classification of the identified anomalies was made according to the magnitude of the magnetic field gradient. The specimens of two types were cut in zones of magnetic anomalies and outside them: type 1 — for cyclic tests and type 2 — for metallographic studies. The geometric parameters and field gradient values of magnetic anomalies on specimens of type 1 and type 2 were the same. Metallographic studies in zones of maximum magnetic field gradient on type 2 specimens revealed defects in the form of a strip at the boundary of different structures, which is a structural stress concentrator (SSC) and a source of the inhomogeneity and changes in the magnetic properties. Type 1 specimens with similar magnetic anomalies and Type 1 specimens cut from sheets outside zones of magnetic anomalies were then selected for cyclic testing. Comparative tests for cyclic strength of the specimens with and without specified SSC were carried out. It is shown that the presence of SSC zones in the specimens reduces the number of cycles to failure during cyclic tests by 1 – 2 orders of magnitude compared to the specimens free of SSC. Based on cyclic tensile tests of specimens, a limiting value of the magnetic field gradient was determined that corresponds to the acceptable level of stress concentration on structural defects. This value is recommended for use as a rejection criterion when examining a new tape by the MMM method.

Control of the parameters of the surface layer of steel parts during their processing applying the material homogeneity criterion

The main goal of the presented research is to assess the technological damageability of the material, which can be used as a criterion for analyzing the technological route of product machining in the "blank-workpiece-final part" technological chain. This technological chain is examined in detail in the most important stages of the life cycles of mechanical engineering products in order to take into account the principles of technological inheritability of their characteristics and quality parameters. The technological inheritability of the properties of the surface layers of machines and mechanisms parts from steel during their machining evaluates and predicts the transformation of the structurally heterogeneous material obtained after the production of blanks into the structurally homogeneous material of the final parts. The procedure for evaluating the homogeneity of the processed material for each technological step by the LM hardness method is presented. The developed methodology was implemented and proven during the manufacturing process of the conveyor belt drive drum shaft.

Минимизация трудоемкости выполнения комплекса вспомогательных действий для операций механической обработки

Abstract. The technological process of manufacturing mechanical engineering products using metal-cutting machines is a structurally complex process. This process can be described by the combination of two types of actions: the working stroke, which results in a change in the structure and properties of the workpiece, and an auxiliary transition, the task of which is to prepare the technological system for the execution of the working process. The execution 
 of auxiliary transitions does not entail a change in the structure and properties of the product, but leads to an increase in the complexity of its manufacture, therefore, increasing the efficiency of technological processes of mechanical processing largely depends on optimizing the complexity of performing a complex of auxiliary transitions. The purpose of the work is to develop a model for optimizing the parameters of a complex of auxiliary transitions for machining operations. The structure of the control object “Technological system” is described, within which two subcategories of control objects are defined: the control object “Technological equipment” and the control object “Wearable equipment”. Hypergraphs of changes in their intermediate states are presented for these subcategories of control objects. According to the presented models, the subcategory of the control object “Technological equipment” has 4 levels of control, the subcategory of the control object “Wearable tooling” has 3 levels of control. Lists of single and vector optimization criteria have been formed for the intermediate states of control objects. A description of a set of actions for the transition of control objects from the (i – 1) state to thei-estate is presented. A list of control parameters has been defined for each subcategory of the control object. The use of the presented model contributes to increasing the efficiency of the technological process by optimizing the values of the parameters of the complex of auxiliary actions at the stage of technological preparation of production.

Importance of engineering technologists in the development of the country’s industrial potential

The role of mechanical engineering technologists in the design and technological preparation of production and the manufacture of mechanical engineering products is considered. The insufficient use of the technological potential of the industry by enterprises is shown. Examples of new technological developments are given. Keywords:mechanical engineering, technology, industry, serial production, productivity, cost, technological equipment, economics naukatm@yandex.ru, dipetreshin@yandex.ru

КОНЦЕПЦИЯ МЕТОДОЛОГИИ ПРОГНОЗИРОВАНИЯ ВОСТРЕБОВАННОГО ПОТРЕБИТЕЛЯМИ КАЧЕСТВА ПРОДУКЦИИ МАШИНОСТРОЕНИЯ ПРИ ВЫХОДЕ КОМПАНИИ-ПРОИЗВОДИТЕЛЯ НА НОВЫЕ КОНКУРЕНТНЫЕ РЫНКИ

The article presents the results of developing the concept of a methodology for predicting the quality of mechanical engineering products demanded by consumers when a manufacturing company enters new competitive markets, using the example of automotive production.

МІСЦЕ ІНЖИНІРИНГУ В ЖИТТЄВОМУ ЦИКЛІ ПРОМИСЛОВИХ ВИРОБІВ

In undertaking the exploration, the authors endeavored to disseminate to the readership a developed comprehension of the essence of engineering as a distinct form of economic endeavor and its positioning within the lifecycle of generating consumer value. Emphasis is placed on shipbuilding artifacts, considering their pivotal role in both the global and, by extension, national economies increasingly enmeshed within the international economic milieu. It is discerned that the upsurge in demand for Engineering services is attributable to the steep ascension in fleet size, notably within its most robust segment - the commercial sector. The doubling of the fleet size for transporting various types of cargo over the past twenty years has been confirmed by visualized statistics. This phenomenon is not merely a result of a surge in maritime freight transportation, which has increased by nearly three hundred percent over the analyzed period. Simultaneously, there is a growing interest among shipowners in extending the operational lifespan of vessels. In this context, they place hopes on vessel repair, modernization, and conversion. Furthermore, even the disposal of these complex engineering structures, in accordance with the requirements of the International Maritime Organization and the standards of the European Union and participating countries, should occur without causing harm to the personnel of specialized shipyards and the environment. It has been demonstrated that solving this problem is also impossible without engineering support. A model has been provided, defining the role of Engineering in the life cycle of industrial products (using shipbuilding as an example). It confirmed the working hypothesis regarding the parallel-sequential organization of relationships between Engineering and other stages of the life cycle of mechanical engineering products. Attention is focused on the fact that addressing the challenges that arise at each stage is facilitated by digital twins of physical objects. The "lives" of both are completely synchronized, as events occurring during the real-time operation of the offline object and their consequences are automatically reflected in the virtual "twin". This conclusion is of particular significance in the context of applying the concept and corresponding tools of Product Lifecycle Management in practice.

Integration of Technological Preparation of Production into Automated Design Systems

The concept of the development of an integrated system for the design of technological processes for the manufacture of mechanical engineering products is considered. The research relates to the field of automation of technological preparation of production in the development of the technological process of manufacturing a product (part, assembly unit). An algorithm for automated analysis of a three-dimensional product model (CAD model) made by the KIT system (KIT-computer information technology) is proposed to identify and formalize significant product parameters. As a discrete element of the part, a structural element is considered as the basis for choosing the manufacturing technology of the product as a whole. The general functional structure of the system being developed is described, which is necessary for the formation of the product manufacturing route taking into account the production process data structured in the product database. The practical result of the system when introduced into production is a reduction in the cycle of technological preparation for the release of a new product. The system allows you to design route-operational TP for all technological conversions of the enterprise. It is possible to design technologies for a group of parts. There are no restrictions on the size of the TP. The volume of the Database of Technological Design (BDTP) to date is more than 7000 technological processes, including existing production and discontinued products. The number of jobs on the enterprise network for the system is more than 150, the degree of coverage of the technological design system in the main production is 100 %.

Formation of conjugate curved surfaces that exclude interference

The object of the study is the method of geometric design of conjugate curved surfaces. The subject of the study is the possibility of achieving the absence of interference of the designed surfaces of kinematic pairs of technical structures, for example, products in mechanical engineering (cutting tools, gearing), based on an invariant method. This problem is of significant importance for a wide class of products, but especially for gears from the point of view of the precision of manufacturing the tooth surface, load-bearing capacity, and, consequently, the reliability and durability of the transmission. When calculating the strength, each tooth of the gear can be considered as a cantilever beam, loaded at the free end by the force of interaction with the second gear wheel. In the presence of interference (for trimming gears), not only the shape of the tooth surface is disrupted, but also the cross-sectional area of the tooth base is significantly reduced. Therefore, solving such a problem is important when designing and manufacturing gears. That is why, when forming the initial curved tool surface of a cutting tool, the conjugacy condition between the points of the product and the tool is taken into account. As a result, when designing a cutting tool using the proposed invariant method using a unified methodology, a wide class of complex curved surfaces can be formed. In particular, this applies to technological operations on numerically controlled machines. The generated conjugate curvilinear transformations of the cutting tool using an invariant method make it possible to avoid interference of mating surfaces at the design stage. At the same time, the curvilinear characteristics of surfaces are analyzed, defining a family of normals as common to two conjugate surfaces with linear contact, which is essential for the design process

Impact of EU sanctions on trade in engineering products between Russia and Central-Eastern European countries: An applied econometric approach

Aim. To assess the impact of Western European sanctions on trade cooperation between Russia and Central-Eastern European (CEE) countries in the machine-building sector.Objectives. Statistical analysis of the dynamics of Russia’s trade relations with CEE countries in the field of mechanical engineering under current sanctions conditions; construction of an econometric model for regression analysis of the impact of Western European sanctions on trade in mechanical engineering products; identification of key trends and problems in trade and economic cooperation between Russia and the CEE region in the mechanical engineering sector in 2021–2023.Methods. The authors used such research methods as statistical and econometric analysis, syntax, description, graphical modeling.Results. The results obtained in the course of econometric analysis indicate that the impact of Western European sanctions on the main indicators of trade in engineering industry products between the Russian Federation (RF) and CEE countries was ambiguous. European Union (EU, EU) sanctions had a greater impact on CEE countries’ export flows than on RF exports to the region.Conclusions. The current sanctions conditions have determined an unfavorable medium-term trend in trade relations in the mechanical engineering sector between Russia and the CEE region. The trade and economic indicators analyzed in this article are the main determinants of econometric analysis that affect the interaction between Russia and CEE countries in the machine-building sector. During the studied period of 2021-2022 the volume of mutual investments showed a negative effect, industrial production had a positive impact on trade in engineering products.

Analysis of the Electrical Impedance of Graphite and Silver Graphite Carbon Brushes for Use in the Impedance Measurement of Sensory Utilizable Machine Elements

The ongoing digitalization of processes and products in mechanical engineering is accompanied by an increasing demand for data. In order to provide this data, technical systems are being extended with sensory functions. To supply those sensory functions on rotating elements—such as shafts—with electrical energy, and to be able to transmit signals out of the system, sliding contacts can be used as a cost-effective and established solution. However, if electrical properties of machine elements are utilized for sensing purposes, such as condition monitoring of rolling element bearings by means of impedance measurement, sliding contacts are directly in the measurement path and can thus influence the measured impedance. The aim of this paper is to analyze the impedance of graphite and silver graphite carbon brushes under different rotational speeds, in different positions, and with different carrier frequencies. The material of the carbon brushes as well as the position have significant effects on the impedance behavior. Furthermore, carbon brushes show a significant running-in behavior. The results are discussed, and indications for use in impedance measurements are given. Silver graphite carbon brushes in axial positioning are particularly suitable for impedance measurements of sensory utilizable machine elements. Sufficient running-in time must be considered.

METHODOLOGY FOR TECHNOLOGICAL DESIGN OF THE PARTS RECOVERY PROCESS

The authors of the paper, each with their own experience of scientific activity and accumulated knowledge in the field of parts recovery and mechanical engineering technology, set out to generalise them and develop a methodology for technological design of the process of recovery of worn parts from the standpoint of a systematic approach. For the stages of the life cycle of mechanical engineering products that solve the problem of extending their service life by repairing and restoring worn parts, a general scheme and structure of information support for technological design using methods of improving the quality of the surface layer have been developed. A scheme for specifying the life cycle of parts by repairing and restoring them is proposed. The process of formation of quality indicators of worn parts is presented in the form of a system that allows to give a multilevel assessment of the quality of restoration of a part.

Calculation of multi-blade rotary-friction tool shaft for strength

The leading place in the technology of modern mechanical engineering production is occupied by cutting processes. In many branches of mechanical engineering, especially in mass production, their labor and production costs reach 40-60% of the total costs of metalworking. Nowadays, no more or less complex machine can be made without the use of cutting tools. Thus, we can rightfully assert that cutting machining has retained its predominant influence on the development of mechanical engineering technology and its importance will be steadily increasing in the future, largely based on the use of fundamentally new machining methods. And the latter can be rightly attributed to the so-called rotary cutting. The authors have developed a design of a special multi-blade rotary-friction tool for machining cylindrical surfaces of parts made of hard-to-machine materials. This paper presents the results of the calculation of the most loaded node of the multi-blade rotary-friction tool of the part “shaft”. Calculation of the bending strength of the shaft has been performed. The results of the calculation have been checked through the program Apm Winmachine which has confirmed their correctness. This research is funded by the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP14972884).

ПРОБЛЕМИ ТА ПЕРСПЕКТИВИ УПРАВЛІННЯ ПІДПРИЄМСТВАМИ МАШИНОБУДУВАННЯ В КОНКУРЕНТНОМУ СЕРЕДОВИЩІ

The article is devoted to the study of theoretical and applied aspects of enterprise management in a competitive environment. On the basis of existing approaches to the process of managing the competitiveness of industrial enterprises, modern approaches to the effectiveness of such management are considered, and its significance in modern conditions is substantiated. Competitiveness is studied as a fundamental category of the market economy, which directly affects the efficiency of the participants of the competitive environment and ensures the stability of the development of the market mechanism as a whole.
 The dynamics and structure of production of machine-building products in Ukraine during 2015-2022 were analyzed, its strategically important role in the country's economy was proven, despite the insignificant share of machine-building products in the total volume of industrial production and the strengthening of exports of raw materials industries. The presence of a crisis in the field of mechanical engineering has been proven, the causes of the crisis have been identified state of machine-building enterprises. The peculiarities of the functioning of the machine-building market in the conditions of military aggression were studied, the main problems and prospects of its development were determined. The main factors of the external and internal environment, which cause negative dynamics of production volumes and sales of mechanical engineering products of Ukraine, are systematized.
 Measures for the further effective and competitive development of this market for the long term have been determined, which include the development of effective state programs and strategies for the development of the industry, stimulation of innovative development of enterprises and the introduction of the latest technologies to ensure the possibility of manufacturing high-quality high-tech and knowledge-intensive products.

Actual problems of creating digital twins of machine engineering products in terms of durability assessment

The global digitalization of production opens new opportunities for predictive diagnostics of the technical condition of mechanical engineering products. The issues attributed to assessing their technical condition, primarily to the determination of the residual life of mechanical engineering products, are considered. Currently, a class of virtual models, digital twins of the residual life is distinguished. Apart from the functions of monitoring and predicting the stability of structures, they can possess a feedback and control the durability by simulating and optimizing the real technological process, taking into account the possibility of achieving the limit state of the structure. The problems of existing methods of assessing the durability in time and frequency domains are considered in detail from the viewpoint of using the residual resource of structures as the basis of an algorithmic support of digital twins. We also marked the possible variety of obtaining initial data for assessing the durability, namely fatigue diagrams of materials for different types and schemes of loading. The fatigue diagram is greatly affected by the loading process (regular, random or mixed), while in the actual work the non-stationary random loading prevails. The methods used for assessing the durability of non-stationary loading are poorly studied and often resolve into simplification of a non-stationary process. The study is focused on non-stationary loading processes, since the creation of digital twins implies a continuous analysis of the durability of the structure for real operational loads. Other problems that can arise when developing digital twins of structures are also considered and discussed.

Development of the structure and methodological support of the system for analysis of the details shaping using the technological inheritability of their quality parameters

Theoretical approaches, computer modell methods and experimental studies analyse the state and behaviour of machine parts to determine the changes in their properties and parameters from a single synergetic position. Development and implementation of integrated information systems for control of technological processes of manufacturing parts and machines assembly is an essential mover of the economic growth of industrialized countries. Complicating the operational conditions for the products increases the requirements for the parameters of their accuracy, surface layer quality, performance characteristics and reliability indicators. A mechanical engineering product is a technical system consisting of many subsystems and using the functionally-oriented design of technological processes planning for parts manufacturing. The structure and methodological providing of the PSPAS-system (Product Shaping / Processing Analysis System) investigates. PSPAS system includes the investigations of the technological inheritability of mechanical engineering product quality parameters combined with the analysis of traditional subsystems (cutting, surface plastic deformation, surface layer modification, assembly). Rheological simulation modelling, holding of experimental studies, the combination of mathematical modelling, theoretical and practical studies of technological processes ensure the implementation of the CAF system using the principle of functionally-oriented design during parts manufacturing and machines assembly.

METHODS OF FORMING COMPLEX PROFILE PRODUCTS FROM HEAT-RESISTANT CERAMIC MATERIALS BASED ON SILICON CARBIDE

The possibility of obtaining complex-shaped mechanical engineering products based on reaction-sintered silicon carbide using two methods - mechanical processing of polymerized blanks before sintering and hot slip molding under pressure, has been studied. The obtained silicon carbide ceramic materials are characterized by a low density of about 3.04…3.07 g/cm3, a porosity of ? 1 % and a bending strength of 320…360 MPa. Materials based on silicon carbide modified with boron carbide have a density of 2.72 g/cm3, a porosity of about 1 % and a bending strength of 280 MPa.

Influence of Texture Effects on the Laser-Irradiated Tool Performance

Introduction. Laser surface treatment of mechanical engineering products makes it possible to increase their durability. However, the laser hardening process is not good at the consistency of results, since choosing the irradiation modes and schemes of specific products, texture effects in the zones of laser exposure are not taken into account. This leads to premature wearing and even destructing the working surfaces of irradiated products. Therefore, the work objective is to study the mechanism of influence of the structure of the laser-hardened layer on the operational properties of the tool.Materials and Methods. The materials for this study were tool steels: R6M5 and R18 (according to the EN 10027 standard tool steels: 1.3355, 1.3343). Pulsed laser irradiation was carried out at the technological device Kvant-16 with a radiation power density of 70–250 MW/m2. Scanning probe and optical microscopy, X-ray diffraction and durometric methods for analyzing the steels structure were used. The values of steel strength in bending and impact strength were determined before and after laser treatment.Results. It has been experimentally proven that it is necessary to strengthen the sections of the products working surfaces that are subject to maximum wear and are under the action of compressive stresses during operation. It is shown that textural effects in the laser treatment zones lead to a decrease in the friction coefficients and contribute to an increase in the wear and adhesion resistance of the steels surface layers.Discussion and Conclusion. The results of the research carried out make it possible to rationally select the surface laser processing modes and schemes of products for various functional purposes and ensure their operability with a guarantee. The possibilities increasing the structural strength and properties of the tool due to laser alloying the surface layers of powder-coated steels and stabilizing tempering after laser irradiation are determined.

Actual features of trade in mechanical engineering products between Russia and the countries of the Central-Eastern Europe

Aim. To identify key features and trends in the process of trade in engineering products between Russia and Central and Eastern European (CEE) countries in 2020-2022.Tasks. To analyze the dynamics of Russia’s trade relations with CEE countries in the field of mechanical engineering (including electronics and electrical engineering) under sanctions; identify the main commodity groups in the structure of the mechanical engineering sector in trade between Russia and CEE countries; identify the impact of Western sanctions on trade in mechanical engineering products between Russia and CEE countries.Methods. The authors used such research methods as statistical analysis, observation, generalization, description and graphic modeling.Results. The results obtained in the analysis indicate that the export of machine-building products of CEE states prevails over the corresponding Russian exports to this region. The sanctions conditions have determined an unfavorable long-term trend in the trade of engineering products between Russia and CEE countries.Conclusions. The trade and economic indicators analyzed in this article have demonstrated a decline in the volume of trade interaction between Russia and the CEE countries in the machine-building sphere, especially the sharp decline in exports of the states of the region to Russia. Under the conditions of sanctions, both sides incur economic losses, which are higher for the CEE states. By freezing trade relations with Russia, the CEE countries are deprived of existing benefits and an occupied niche in the Russian market. Moreover, it will be difficult for the states of this region to find new markets for engineering products and to compensate for the losses due to the refusal of exports to Russia.

Application and Prospect of Intelligent Manufacturing in Practice

Intelligent manufacturing is the core technology paradigm of the new round of scientific and technological revolution, and the main direction of strengthening the integration of digital and real technology and building a manufacturing power. This paper focuses on intelligent manufacturing. Take intelligent mechanical engineering, intelligent logistics, industrial robots and intelligent production workshops as examples. Exploring the phased achievements and applications of intelligent manufacturing technology. Research showed that the realization of intelligent manufacturing has adopted technologies such as the Internet of Things, big data, cloud computing, machine learning, intelligent sensing, interconnection and remote operation and maintenance, effectively solving many current engineering and scientific research problems. Indicating that the intelligent manufacturing industry supported by information technology and advanced digital technology has broad application prospects. It also provides reference for the application and high-quality development of intelligent manufacturing.

Quality of Machinery and Equipment Provides a Strategy for the Breakthrough in Mechanical Engineering

The possibilities of solving the problems formed in modern engineering in Russia, associated with the low competitiveness of domestic technology, are investigated. Organizational, technological and economic solutions have been proposed that will accelerate the improvement of product quality and the expansion of production volumes in accordance with the requirements of technological modernization of the country's economy. At the core of these decisions there is the organization of large machine-building companies and complexes capable of raising the quality of mechanical engineering products to the level of the world's best analogues at all stages of the machines’ life cycle, as well as the reasonable choice of the areas of diversification and technological modernization of production, the organization of branded engineering and technical support for manufactured machines and equipment.