Repair Of Machinery Research Articles

Influence of different composite curing agents on the rapid curing characteristics and mechanical performance of epoxy resins

To address the need for rapid in situ plugging and repair of hydraulic machinery and chemical pipelines and to resolve the issue that a single curing agent cannot simultaneously achieve rapid curing and excellent mechanical properties in epoxy resin systems, this study explores the use of composite curing agents. In particular, effective formulations are designed for mixing fast and slow curing agents, studying their effects on the curing behavior, curing quality, and mechanical properties of epoxy resins and elucidating their influence mechanisms. The results indicate that three resin systems meet the requirements for rapid curing (curing time within 30 min): 4A6B/EP, 2A8B/EP, and 0A10B/EP. Among them, 4A6B/EP exhibits the best curing quality and mechanical properties. In particular, 4A6B/EP demonstrates the lowest values of curing shrinkage rate, internal curing stress, average pore size, porosity, and cumulative pore volume. Its low internal stress and low defects reduce the stress concentration, while more efficient deflection and branching of internal cracks enhance its deformation resistance. Consequently, 4A6B/EP shows the highest microhardness, fracture toughness, tensile strength, Young’s modulus, and elongation after fracture. Based on the comprehensive evaluation of rapid curing characteristics and mechanical properties, the 4A6B/EP system offers the best overall performance. Therefore, it is recommended as the preferred resin system for rapid plugging and repair of composite materials, providing a theoretical basis and technical support for boosting the application of epoxy resin composite materials in high-tech fields.

НАУЧНАЯ ШКОЛА ПРОФЕССОРА ПЕТРА ВАСИЛЬЕВИЧА СЕНИНА

The strategic task in the field of modern higher education is to develop the research potential of the university, to educate scientific staff. The effectiveness of this process depends on the successful functioning of scientific schools. In this regard, the research aimed at studying the experience of the author's scientific schools is relevant. (Research purpose) The research purpose is analyzing the concept and features of the scientific school as a form of personal growth and formation of researchers at the university using the example of research in the field of developing technologies for high-resource repair of machinery and technological equipment using metal coatings with specified functional properties (experience of the scientific school of professor P.V. Senin). (Materials and methods) Applied scientific and theoretical methods of analyzing the experience of the functioning of a scientific school, summarized and interpreted the criteria for its success as a form of personal growth and becoming a researcher at a university. Scientific and technical literature and publications in the field of humanitarian knowledge were used in the study. (Results and discussion) The experience of the P.V. Senin scientific school has shown that the implementation of the mechanisms of personal growth and formation of researchers at the university is the inclusion of students in the process of the scientific school, based on the creation of innovation centers, research laboratories, student teams, as well as the publication activity of the community of scientists on the basis of general theoretical and methodological approaches reflecting common research results. It was determined that the priority task of the scientific school is the interaction of university science and economic sectors aimed at creating technologies for high-resource repair of machines using the method of electric spark processing. (Conclusions) The results of the activities of the P.V. Senin scientific school allow us to consider this structure as a point of personal growth and professional development of a research student, a young scientist.

Occupational safety during operation, maintenance and repair of machinery

In article safety of working conditions of workers country, farms is shown at op-eration of agricultural cars and the equipment on various often carried out works in ag-riculture and animal industries, at maintenance service and operating repair of main-tained technics, and also at an emergency, on fi re safety, maintenance with means of in-dividual defense and tool control of working conditions.

Theoretical and practical aspects of ensuring the safety of workers at diagnostic posts, maintenance and repair of agricultural machinery

Theoretical and practical aspects of ensuring the safety of workers at diagnostic posts, maintenance and repair of agricultural machinery

The history of agricultural machinery repair system in Russia

The paper highlights the imperative for the maintenance and repair of agricultural machinery. (Research purpose) The research aims to undertake a retrospective analysis illuminating the evolution and establishment of the machine repair system. This analysis spans from the production of the inaugural Soviet tractor to the advancement and production of contemporary machinery and equipment. (Materials and methods) The paper analyses publications from different periods focused on the challenges surrounding the establishment of a centralized system for the repair and maintenance of machinery and equipment across all stages of agricultural production development. (Results and discussion). The paper sheds the light on the dynamics of tractor production in the early 1930s, detailing the transition from reliance on imports to the utilization of domestic agricultural machinery in the local market, alongside the phases involved in establishing a domestic repair service system. Furthermore, it explores the evolution of repair workshops at machinery technological stations from 1928 to 1957 and outlines the structuring of a repair depot within the enterprises of the All-Union Association «Soyuzselkhoztekhnika» between 1961 and 1990. Additionally, the paper delves into the analysis of repair strategies, ranging from individualized to in-line approaches. The paper underscores the pivotal role of academic and industrial science in equipping repair enterprises with essential technological documentation, repair equipment, and supplementary materials. It also highlights their contribution to the development of methodological support for maintenance and repair operations at the level of a centralized system. (Conclusions) The paper presents information on the research and design activities undertaken by specialized laboratories and departments within the All-Union Scientific Research Institute of Agricultural Mechanization VIM from 1930 to 1961. It acknowledges the significant contributions of scientists and experts in the domains of machine wear theory and the standardization of repair technologies. Furthermore, the paper emphasizes the critical influence of the State Union Scientific Research Technological Institute for the Repair and Operation of Tractors and Agricultural Machines GOSNITI between 1963 and 2013 on establishing a robust machinery repair and maintenance system. It outlines the potential and future directions for the evolution of a service system for agricultural machinery.

PROTECTION OF THE ENVIRONMENT FROM OILY WASTE
 CONTAINING DIESEL FUEL AND FUEL OIL

The analysis of spent oil-containing products formed at enterprises associated with the repair and maintenance
 of machinery and equipment was carried out, which showed the presence of a large amount of waste containing diesel
 fuel and fuel oil. It is indicated that the negative effect on the surface quality of building structures and products when
 used in the manufacturing process as an anti-adhesive coating, an emulsion in the preparation of which oil-containing
 waste containing diesel fuel and fuel oil was used. The effect of diesel fuel and fuel oil on the stability of an emulsion
 prepared using oily waste from enterprises for the repair and maintenance of machinery and equipment has been experimentally
 determined. Technological solutions have been proposed to increase the surface quality of reinforced concrete
 products to the required level when using an emulsion based on oily waste with the presence of diesel fuel and fuel
 oil as an anti-adhesive coating.

Проектирование ремонтных мастерских сельскохозяйственных предприятий с учетом требований безопасности

The article discusses the design of repair shops of agricultural enterprises taking into account safety requirements. The design of repair shops for maintenance and repair of agricultural machinery is a complex of numerous activities aimed at organizing uninterrupted, high-performance and safe work, which requires close attention during the design process to all elements of the technical process, compliance with the requirements of regulatory and technical documents both at the project development stage and at stage of implementation and operation of the facility. Keywords: REPAIR SHOP, AGRICULTURAL ENTERPRISE, SAFETY, MAINTENANCE, REPAIR, STORAGE OF EQUIPMENT, WORKING CONDITIONS, LABOR SAFETY REQUIREMENTS

Эргономические основы организации рабочих мест на предприятиях АПК с учетом требований безопасности на примере разборочно-моечного участка по ремонту двигателей

The article considers the organization of workplaces and ensuring their safety, which is one of the most important tasks in the operation of enterprises for the repair of agricultural machinery. We analyzed the theoretical issues that are fundamental at the stage of organizing workplaces of agricultural repair enterprises. The characteristics of the workplace related to ergonomics and their application at the design stage are also considered. It should be noted that the productivity and safety of personnel directly depend on the correct organization of the workplace. Keywords: WORKPLACE, ERGONOMICS, CHARACTERISTICS OF THE PRODUCTION ENVIRONMENT, WORKING POSTURE, CONTROL BODY, FATIGUE, PERSONNEL, VISUAL AREA, OPERATOR

Organization of a supply chain as a way to improve the quality of technical maintenance and repair of equipment in the agro-industrial complex

In modern conditions of ensuring the competitiveness of agricultural sectors, an important place is occupied by effective management of the process of maintenance and repair of machinery. The effectiveness of actions in this area is determined by the change in the nature of the processes taking place in agricultural commodity production, in connection with the redistribution of the material and technical base, the organization of work and the reorganization of the management structure. In this paper, the ways of improving the quality management process of maintenance and repair of equipment in the agro-industrial complex by organizing a supply chain are considered.

ВКЛАД АКАДЕМИКА ВАСХНИЛ А.И. СЕЛИВАНОВА В ПОДГОТОВКУ НАУЧНО-ПЕДАГОГИЧЕСКИХ И АГРОИНЖЕНЕРНЫХ КАДРОВ РОССИИ

The development of engineering education in Russia plays an important role in the creation of future technologies, the development of new inventions. (Research purpose) The research purpose is forming a patriotic attitude to engineering education in Russia on the example of the activities of a prominent scientist in the field of mechanization and electrification of agriculture, Doctor of Technical Sciences, Professor, academician of the VASHNIL Aleksandr Ivanovich Selivanov. (Materials and methods) The analysis of literary sources was carried out by applying the historical and analytical method. Modern and historical literary sources, conference materials, scientific manuscripts, military-historical materials, original scientific works of A.I. Selivanov were used as materials. (Results and discussion) They outlined the life and creative path of A.I. Selivanov. After graduating from the Faculty of Industrial Agriculture of the Leningrad Polytechnic Institute, A.I. Selivanov worked his way up from an engineer, head of a laboratory, to deputy director for scientific work of VIM, GOSNITI, Siberian Research Institute of Mechanization and Electrification of Agriculture. (Conclusions) A significant cycle of his work is aimed at developing maintenance and repair systems for machines and the rational organization of the repair base. A.I. Selivanov is the founder of the theory of aging of machines, co-author of the textbook "Theoretical foundations of repair and reliability of agricultural machinery." Under his leadership and with his direct participation, a standard tractor and combine repair technology was developed, which served for many years as the main technical document for all repair enterprises. A.I. Selivanov made a huge contribution to the training of scientific, pedagogical and agroengineering personnel in Russia. His diligence, courage, bravery, heroism, perseverance and many other qualities that are necessary for our younger generation serve as a real example for many people.

Creation of innovative production systems in the machinery repair direction

This article examines the impact of digitization on machine repair production through the use of mathematical models. The main research tasks include analyzing recent studies and publications, identifying practical aspects of implementing innovative digital approaches in the machine repair production of Ukraine, developing mathematical models that describe the influence of «Industry 4.0» integration on machine repair processes and their research, and providing recommendations for machine repair enterprises to use innovative approaches to achieve stability in a changing market environment. The main focus is on analyzing the combination of «Industry 4.0» concepts and flexible production in machine repair processes. The research demonstrates significant potential for improving efficiency and productivity in this field with the implementation of innovative digital technologies. Based on the modeling, the possibility of assessing the impact of innovativeness on results in the context of machine repair has been considered. It is important to consider that this is only the most likely scenario of innovativeness, and actual results may depend on various factors, such as the amount of resources invested in research and implementation of innovations, as well as the level of competence of the personnel and other factors. Taking into account these additional factors allows understanding which combination of factors has the greatest impact on the results. Recommendations for further research include the use of machine learning algorithms and artificial intelligence to increase the accuracy and predictive capabilities of mathematical models. It is also recommended to explore the possibilities of integrating various digital technologies to achieve a synergy effect. For successful implementation of recommendations, it is important to systematically monitor their implementation and make necessary adjustments. Overall, this study opens up prospects for using digital technologies to improve the efficiency of machine repair production. Implementing the recommendations can lead to a significant increase in productivity and quality of processes, thereby enhancing the competitiveness of this market sector.

Friction and tribocorrosion behavior of Fe-Cr-B alloys manufactured by laser directed energy deposition

The current assessment of tribocorrosion in alloys for mining machinery repair is insufficient. This study explored four Fe-Cr-B alloys with similar compositions but varying hardness. Dry and wet (water) friction tests align with the hardness hierarchy, indicating enhanced wear resistance with higher hardness. However, tribocorrosion tests yield diverse results. Notably, High-hardness alloys (JG-11# and 431) had many boride phases, displaying corrosion pits, leading to early corrosion failure. Low-hardness alloys (JG-3#) had fewer boride phases, indicating friction-dominated failure. Balancing both hardness and corrosion resistance, the alloy (JG-8#) demonstrates excellent tribocorrosion performance while ensuring the absence of micro corrosion pits.

Using of microsilica for improvement of physical and mechanical properties of epoxide-based composite material

Utilization of industrial waste and secondary raw materials, in particular, in the production of metallic silicon and silicon-containing alloys, which include silica vapors (microsilica), is the main task of implementing environmental policy and solves the problem of their storage and negative impact on the environment, in order to reuse them in polymer composites. The use of microsilica as a filler in composite materials based on epoxy resins contributes to a positive effect on the basic properties of the resin, and also makes it possible to use the composite material as coatings and parts in the repair of machinery and equipment. The aim of the work was to establish the positive effect of microsilica as a filler in composite materials based on ED-20 epoxy resin on improving the physical and mechanical properties of composite materials. Within the framework of this work, studies were conducted to test composite materials based on ED-20 epoxy resin, differing in different filler content of 2, 5, 10, 15 wt. % on impact strength, tensile strength and modulus of elasticity, adhesion and impact strength of the coating. The analysis of the obtained results showed a positive effect of microsilica as a filler in composite materials based on ED-20 epoxy resin on the physical and mechanical properties of the composite material. The optimal filler content was determined, which is 2 % of the mass of the ED-20 epoxy resin, while an increase in adhesion, toughness of the composite material by 45 %, tensile strength and modulus of elasticity by 21 % and 5 %, respectively, and the strength of the coating on impact by 32 %, compared with the addition of microsilica in ED-20, which shows the prospects of using microsilica as a filler in composite materials

Development of virtual reality technologies for training on the maintenance of the tractor «Belarus 1523»

Modern information technologies provide wide opportunities for increasing the effi ciency of learning and practical application of knowledge in various spheres of activity. One of such spheres is the technical maintenance and repair of complex agricultural machinery, which requires high qualifi cation and professionalism from specialists. The article considers an example of introducing new information technologies into the process of learning timely aspects of technical maintenance and quality repair of the tractor "Belarus 1523", which is one of the most common and demanded in agriculture. The authors of the article propose a new approach in the system of technical maintenance of machinery, which consists in using virtual reality, allowing to optimize the learning process and signifi cantly reduce costs. Virtual reality allows creating realistic simulations of various situations related to the operation and repair of machinery, as well as provides interactivity and feedback for learners. Such an approach contributes to increasing motivation, interest and satisfaction from learning, as well as forming the necessary skills and competencies for successful work with agricultural machinery. The article contains a detailed description of the methodology of developing and using virtual reality for learning technical maintenance and repair of the tractor "Belarus 1523", as well as presents the results of experimental testing of the effectiveness of such an approach. The article is of interest for specialists in the fi eld of information technologies, education and agriculture.

Technical and economic assessment of maintenance and repair systems of agricultural machinery

Relevance. The efficiency of agricultural production largely depends on the technical condition of the agricultural machinery fleet. The technical condition, in turn, depends on many factors that determine the level of operation of the equipment. One of the most important factors determining the reliability of agricultural machinery, the cost of restoring and maintaining the working condition of agricultural machinery is the frequency of maintenance. As a result of studies conducted in the agricultural organizations of the region, it was revealed that engineering and technical services, when organizing maintenance and repair (TO and R), use canceled GOST, referring to the fact that domestic equipment, its reliability and performance are not able to recover when frequency of 125 hours. Therefore, the purpose of this study is to determine the effect of the frequency of maintenance and repair on the preservation of the resource and the indicator of the rate of change of the resource, on the performance of the machine-tractor unit (MTA), on fuel consumption, on the costs of restoring and maintaining the working condition of agricultural tractors.Methods. The following methods were used in the study: normative, statistical, expert assessments, experimental, calculation-constructive, economic-mathematical methods. For the economic justification of the periodicity of technical impacts of agricultural machinery, statistical data from agricultural organizations were used, GOST regulating the maintenance and repair of agricultural machinery were used.Results. The maintenance and repair system, regulated by GOST 20793-2009, meets the requirements of technical and production operation of tractors. Traction properties of tractors are higher by 0.7%, specific fuel consumption during agricultural technological operations is lower by 0.5%, labor costs for maintaining and restoring technical readiness are lower by 13.8%.

Ensuring the environmental friendliness of internal combustion engines of agricultural machines in conditions of limited air exchange

The method of protection of personnel working in greenhouses, greenhouses and premises for maintenance and repair of agricultural machinery from exposure to exhaust gases in accordance with the “environmental concept”, according to which the negative impact must be reduced before the products of spent gases will enter the air of the working area of the service personnel and the driver of the machine. The problem was solved with the help of evaporative humidification of the air-fuel mixture due to its simplicity and effectiveness, confirmed during tests on a tractor.

Application of 3D Printing and 3D Scanning Technologies in the Manufacture and Repair of Agricultural Machinery

Data are presented on the study of the concept of a 3D farm in production, as well as an assessment of the possibilities and prospects for using this concept in the agribusiness based on real cases performed using the material and technical base of the Federal Scientific Agroengineering Center VIM. The main advantages and disadvantages of 3D printing were identified, the world experience in the use of additive technologies, as well as 3D printing and 3D scanning sites using technical base of the Federal Scientific Agroengineering Center VIM, both in the manufacture of prototypes and mock-ups, and products for the repair of agricultural machinery and equipment, weas studied. Further prospects for the use of 3D farms at repair enterprises are determined.

THE NEED TO IMPROVE THE MANAGEMENT OF THE EQUIPMENT TECHNICAL STATE THROUGH THE USE OF DIGITAL MONITORING TOOLS

Thanks to the development of modern electronics and information technologies, digital diagnostic systems are being actively introduced at industrial enterprises in Russia. These systems allow you to monitor the technical condition of machines and significantly simplify maintenance by transmitting data for troubleshooting directly to the service departments. (Research purpose) The research purpose is analyzing and developing the proposals for improving the management of the technical state of machines through the introduction of digital monitoring tools. (Materials and methods) Studied the materials and documentation developed at VIM, GOSNITI, included in the «Integrated system of maintenance and repair of machinery in Agriculture», as well as methodological guidelines for diagnosing and managing the reliability of agricultural machinery. It was established that in order to effectively manage the technical condition of the operated and manufactured equipment, it is necessary to develop digital diagnostic and monitoring tools. (Results and discussion) They presented the priority requirements for the use of digital monitoring tools used in the implementation of assigned repair and maintenance actions based on data from periodic or continuous monitoring by diagnostic tools. Within the framework of the implementation of the industry project «Digital Agriculture» on the basis of KSTOR to develop proposals for managing the reliability of agricultural machinery. At the same time, digital monitoring systems should provide non-selective diagnostics of components with the possibility of general and indepth monitoring; assessment of the condition without the influence of the «human» factor; the efficiency of data extraction to obtain a significant technical and economic effect. (Conclusions) In order to effectively manage the technical condition, it is necessary to increase the level of adaptability of units and aggregates to diagnostics for the use of developed digital monitoring tools.

Automatic system for decision-making support at the machine parts restoration by plasma spraying

The analysis results of the existing scheme for the technological process of machine parts repair and restoration are presented. The existing systems for decision-making support at the repair of machinery and equipment are considered. Taking into account modern information technologies aimed at increasing the level of the production processes automation, a block diagram of a decision-making support system at the restoration of machine parts by plasma spraying is formed. Keywords machine repair, machine parts, parts restoration, decision-making support system, database, control unit, module, plasma spraying

ТЕОРЕТИЧНІ ЗАСАДИ ФУНКЦІОНУВАННЯ РИНКУ СІЛЬСЬКОГОСПОДАРСЬКОЇ ТЕХНІКИ

The article considers and analyzes the views of domestic and foreign scholars on the theoretical definition of the market in general and the agricultural machinery market in particular, and forms a critical assessment of their statements. A detailed analysis of the place of each subject of market relations and their impact on the functioning of the market is carried out. The author emphasizes the special place occupied by financial institutions and agricultural producers in market relations. The author emphasizes the need to direct the efforts of agricultural machinery market participants to ensure the most favorable conditions for the activities of agricultural enterprises as the main source of effective activity of each of the participants. The essence of the market is defined through its functions and principles. In modern conditions, the market performs the following functions: intermediary, pricing, information, regulatory, stimulating, and health-improving. The principles on which the market economy is based are: the principle of freedom of economic and entrepreneurial activity of an individual, family, social group, enterprise in all spheres of life within the framework of the rule of law; the principle of state regulation of the market and market relations; the principle of market pricing; the principle of contractual relations; the principle of openness of the economy; the principle of competition. The development and formation of the agricultural machinery market is influenced by historical processes, as well as by socio-economic factors which define it as an integral system of interdependent components which are united for one purpose - to make a profit. Based on a critical assessment of the definition of the essence of the category “market”, analysis of research by classical and contemporary economists, both domestic and foreign, the concept of the agricultural machinery market should be interpreted as a set of relations between producers, sellers (dealers), financial institutions, logistics companies and the State, on the one hand, and buyers, on the other, regarding the purchase, operation and repair of agricultural machinery to maximize the economic effect of all parties to the relations.