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Author(s):  
Ivan Dehtiarov ◽  
Anna Neshta ◽  
Mykola Samardak ◽  
Vitalii Kononovych ◽  
Yaroslav Klok

The article analyzes the causes of the situation with the appearance of manufacturing errors and the lack of the necessary technical requirements to perform a pin conical joint his intended purpose. The analysis was performed based on geometric construction of the assembly dimensional chain of two parts to be connected and a conical pin with a taper 1:50 according to GOST 9465-79, which is used in the pin joints of pumping equipment. The geometric analysis included the separation of deviations into linear dimensions and angular deviations. The values of the angular deviations were reduced to the linear values of their projections along the axis of the pin, to determine the tolerance on the end height protrusion of the pin above the surface of the connecting parts. Also, the unfoundedness of assigning the roughness index of the hole under the pin at the level of Ra 1.6 μm and its inexpediency when it is impossible to ensure the required contact length is theoretically proved and the solution of this contradiction is proposed. A detailed analysis of the technical requirements for drawings of pumping equipment units containing pin conical joints and paragraphs of the relevant standards, which resulted in the inconsistencies, and offer recommendations that will ensure the quality of the joint following its official purpose. Analysis of the geometric parameters of pin conical joints for the first time allowed to determine the dependence of the height of the pin end protrusion above the surface of the connecting parts and the tolerance for this parameter, as well as to propose mathematical dependences for their determination. The presented dependencies can be used in practice for a reasonable calculation during the design of pin conical joints in pump nodes and in machine-building enterprises where such joints are used. For the first time, the determination of the tolerance for hole size for machining conical reamers is presented, and the formula for calculating this parameter is proposed, which is given in the recommendations for their use in machine building enterprises and products containing pin conical joints.


2021 ◽  
Vol 2131 (2) ◽  
pp. 022033
Author(s):  
A Totay ◽  
S Galyuzhin ◽  
A Galyuzhin

Abstract The article analyzes such basic methods of drying compressed air of pneumatic systems of machine-building enterprises as condensation, sorption, diffusion and force action and determines the advantages and disadvantages of each of these methods. It is noted that the method of force action on water particles due to the use of the centrifugal force allows you to remove only droplet moisture, and vaporous moisture remains in the compressed air. With further cooling of the compressed air, condensate reappears in it. Other methods are more efficient, but require consumables or complex devices for drying compressed air, which ultimately leads to an increase in the cost of such devices and an increase in operating costs. Based on the conducted analysis and on the fundamentals of theoretical mechanics, magnetic field theory and molecular physics, a method of magnetic-centrifugal drying of compressed air has been developed. The essence of the method is to use the Lorentz force, which acts on a water particle (a molecule, a dimer, a trimer, etc.) and coincides in the direction with the centrifugal force. When using the safe supply voltage of a 24 V solenoid that creates a magnetic field in which an electrically charged water particle moves, it is possible to increase the radial force (compared to the centrifugal force) acting on this particle by about 70 times. The authors also consider the methods of ionization of water particles that allow knocking out electrons from their outer shells. Experimental studies conducted on a mock-up sample showed a fairly high efficiency of this method, since it was possible to achieve the 3rd class of purity according to ISO 8573-1: 2001.


2021 ◽  
Vol 1 (73) ◽  
pp. 30-32
Author(s):  
M. Egorov ◽  
A. Feofanov

This article is devoted to technological processes at machine-building enterprises. Analysis of the effectiveness of the certification process and management of particularly responsible technological processes. Identification and definition of the technological process. Requirements for technological documentation


2021 ◽  
Vol 10 (45) ◽  
pp. 281-292
Author(s):  
Lilya F. Zakharova

Modern high-tech production must be highly-effective and competitive, what is possible only when effective management system is available. There are disadvantages and problems of domestic machine-building enterprises and their practical experience. On the basis of made research with using fundamental theoretical and applied developments in the sphere of increasing management there is suggested conceptual appearance of a unique prognostic system of machine-building enterprises not mass production, the choice of directions of increasing these enterprises’ operative management system is justified. The purpose of the article is to propose ways to improve the efficiency of manufacturing enterprises. The methodology used in conducting this study and developing proposals for increasing the efficiency of production systems is based on the principles and methods of the general theory of management, its cybernetic and social components, as well as methods of specific management sciences for the creation and effective functioning of enterprise management mechanisms.


2021 ◽  
Vol 2 (3) ◽  
pp. 124-129
Author(s):  
Vladyslav Yakovlev ◽  
Olena Druhova

The purpose of the article is to study the management of production potential of machine-building enterprises in the Kharkiv region, 9 enterprises were analyzed and their production indicators were studied. The effectiveness of the production potential is characterized by production, technological, financial and innovative components. It should be noted that since the production potential is a component of the economic potential of the enterprise, the structure presented in Fig. 1 is quite conditional. If we consider the production potential from this point of view, then, for example, its innovative component is inextricably linked with the innovative potential, and the financial component – with the financial potential. Sustainable development and competitiveness of an industrial enterprise depends on the level of production potential, which is the foundation of production activity. The production potential of an industrial enterprise is a complex, dynamic and stochastic system consisting of a number of interconnected components. At the legislative level, an attempt has been made to build a single model of an integrated indicator of the financial condition of large, medium and small enterprises. According to the approved IFI Procedure for assessing the financial condition of a potential beneficiary of an investment project, the level of financial condition of the enterprise is determined depending on the value of the integrated indicator, which allows the classification of enterprises in the industry or region. At the same time, questions about the structure of innovation potential remain controversial in the scientific literature. The development of an integrated module for the assessment of production potential is the first stage of the presented methodological approach. The next step is to improve the information subsystem of monitoring the financial and economic activity of industrial enterprises, which in turn is an integral part of the IT system of enterprise management. At this stage, it is necessary to develop software that provides analysis and comprehensive assessment of production capacity. After integrating the software module with IS monitoring, we have to test the software using the collected database on the financial and economic activity of the enterprise. Comparing the results of the assessment with the assessment from the analytical reports of independent experts will allow to determine the level of adequacy of the presented model and software. Methodology. The analysis was conducted on the basis of financial statements of enterprises of the machine-building industry of Kharkiv region for the period 2018, 2019, 2020. Results of the study show that the enterprises of the machine-building industry have low indicators of production potential, so enterprises need to change the strategy in the market to improve production capacity to increase competitiveness and improve. Practical implications. Given that companies have lost traditional markets in recent years and products are not in high demand in European markets, it is necessary to develop ways to improve the management of the potential of machine-building enterprises, seek new markets and strengthen cooperation with international companies. Value/originality. The study will help the management of enterprises to more effectively manage the enterprise and improve their production capacity.


Author(s):  
A. Makarenko

An integral assessment of the production capacity of several machine-building enterprises, which includes their financial position analysis, is performed in the article. The methodological basis for determining the integral indicator of the financial position is a method of multifactorial discriminatory analysis. Five classes assigned based on the level of financial position range from the highest level of capacity to meet obligations and the lowest probability of default to the lowest level with a high probability of default. The analysis shows that the financial independence ratio exceeds the critical value for 60% of enterprises, 40% pay off debt in time and their financial risk ratio value is close to industry standard, 20% entities encounter problems with paying off current debt. In general, according to the results of integral assessment of the considered enterprises production capacity, over 60% of the entities belong to the first class, 20% - each to the fifth and second classes. These results serve as an input in the development of required rate of return assessment model to enhance capital budgeting at machine-building enterprises.


Author(s):  
V.F. Bulavin ◽  
T.G. Bulavina ◽  
D.V. Koshutin ◽  
V.V. Yakhrichev ◽  
A.S. Stepanov

Technological transformation involves the integration of medium and small machine-building enterprises into a single field of virtual factories. The integration is based on the strategy of transition to digital production within the framework of national projects and the National Technology Initiative. Divergent thinking is regarded as a driving factor in production and management, which significantly affects all aspects of socio-economic activity. The convergent application of CAD / CAM / CAPP / CAE / CAO ideologies is at the initial stage of use, while individual process components are widely used at all levels of enterprises. The paper considers the development of a group of competencies that ensure the combination of advanced production technologies, as well as their distribution in the field of small and medium-sized machine-building enterprises. The production for markets of new qualities and the development of high-tech directions in the industry lead to the production of globally competitive products. To respond to these trends, deep automation, digitalization, and intellectualization of production processes are required, which implies the combination of material and digital virtual production. A dynamic environment and the challenges it entails need quick and effective decisions to remain competitive in the long term and the ability to accelerate adaptation processes. These total changes are accompanied by the development of fundamentally new business processes at all levels.


2021 ◽  
pp. 214-234
Author(s):  
Piotr Jedynak ◽  
Sylwia Bąk
Keyword(s):  

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