Electroplating of Indium-Cadmium and Tin-Cadmium Alloy Coatings

Technological parameters for electroplating cadmium alloy (Cd (24)-In and Cd (33)-Sn) coatings from low toxic solutions have been proposed. Since the fabricated alloy coatings possess low internal stress and microhardness, good adhesion property, high corrosion and wear resistance, they can be used as protective coatings for machine building products to enhance reliability and operability thereof. The presence of good solderability and low values of transient electric resistance in climatic testing favor these coatings to be applied in hetero-structured contact systems of instrument making products for increasing their reliability and operability in a tropical marine climate.

Increasing the mechanical properties of structural cast iron for machine-building parts by combined Mn – Al alloying

The object of research in this work was cast iron for machine-building parts, alloyed with Al. The possibility of improving the mechanical properties of cast iron by choosing the optimal Mn – Al combinations, depending on the carbon content in the cast iron, was determined. The study was carried out on the basis of available retrospective data of serial industrial melts by constructing the regression equation for the ultimate strength of cast iron in the three-factor space of the input variables C – Mn – Al. The optimization problem was solved by the ridge analysis method after reducing the dimension of the factor space by fixing the carbon content at three levels: C = 3 %, C = 3.3 %, and C = 3.6 %. It was found that the maximum values of the ultimate strength are achieved at the minimum level of carbon content (C = 3%) and are in the range of values close to 300 MPa. In this case, the Al content is in the range (2.4–2.6) %, and the Mn content is about 0.82 %. With an increase in the carbon content, there is a tendency to a decrease in the content of Mn and Al in the alloy, which is necessary to ensure the ultimate strength close to 300 MPa. The results of the ridge analysis of the response surface also showed that at the upper limit of the carbon content (C = 3.6%), it is not possible to reach the ultimate strength of 300 MPa in the existing range of Mn and Al variation. All solutions are verified for the following ranges of input variables C = (2.94–3.66) %, Mn = (0.5–1.1) %, Al = (1.7–2.9) %. Graphical-analytical descriptions of the optimal Mn – Al ratios are obtained, depending on the actual content of carbon in the alloy, which make it possible to purposefully select the optimal melting modes by controlling the tensile strength of the alloy

Ivchenko-Progress Se State and Prospects of its Development

May 5, 2021 marked the 76th anniversary of the foundation of Zaporizhzhia Machine-Building Design Bureau Progress State Enterprise named after Academician H. Ivchenko (Ivchenko-Progress SE). On May 5, 1945, by order No. 193 signed by the People's Commissar of the Aviation Industry of the USSR O. Shahurin a research and development bureau (RDB) was established at the State Union Plant No. 478 in Zaporozhye to develop new and update earlier designed medium and low power aircraft engines for civil aviation.

Analysis of geometric parameters and technical requirements for pin conical joints in pump nodes

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.

sectoral FORMS OF REGULATION of SOCIAL AND LABOR RELATIONS: REGIONAL ASPECT

In this article, the author examines the system of regulation of social and labor relations at sectoral enterprises of the machine-building industry in the region. The study of the contribution of the industrial potential of the machine-building industry to the economy of the region and the country has been carried out. The goals and objectives of trade unions in the system of social partnership, legislative and legal acts regulating labor relations at the regional level are analyzed, the structure of the republican sectoral tripartite commission is shown and examples of the implementation of republican sectoral agreements and collective agreements of enterprises are presented. The author identified the possible risks of legal uncertainty in the regulation of social and labor relations at the regional sectoral level. New forms and mechanisms of interaction with Russian industrial corporations for solving social and economic issues of labor collectives have been formulated and proposed. The conclusion of corporate agreements is becoming one of the key benchmarks.

ANALYSIS OF TENSENESS AND DURABILITY OF THE MAIN PARTS FOR THE CUTTING PART OF UKD 200-500 COAL SHEARER

JSC "Kharkiv Machine-Building Plant "Svitlo Shahtarja" has created and introduced into serial production a new generation UKD200-500 coal shearer. The most loaded element of the shearer is its cutting part. It is a three-stage reducer with an electric motor. Calculations for the strength and durability of gearing, shafts, bearings, spline, pinned and hinge joints have been carried out. The modeling of the stress-strain state for the main parts and assemblies by the finite element method has also been carried out. Calculations have shown that the strength and durability of all parts is ensured. Consequently, the required durability of 15000 hours and the average resource before major overhaul are not less than 800...1000 thousand tons are provided.

STUDY OF PERFORMANCE INDICATORS OF TRANSPORT MACHINE-BUILDING AND RAILWAY INDUSTRY ENTERPRISES IN A PANDEMIC CONDITION COVID-19

The article analyzes the impact of the consequences of the quarantine measures introduction to counter the pandemic COVID-19 on the economy of Ukraine in general and the domestic transport machine-building sector in particular. It has been established that one of the most affected sectors of the economy is transport and mechanical engineering, in particular the railway transport sector. It is determined that at present a very relevant issue for the further development of domestic enterprises of transport machine-building and railway industry is the assessment of the impact of the COVID-19 pandemic on the activities and financial and economic performance of these enterprises. The financial and economic indicators of such domestic enterprises of transport machine-building and railway industry, such as JSC "Ukrzaliznytsia", PJSC "KVBZ", SE "UkrNDIV", LLC "LEMTRANS" and LLC "KERNEL-TRADE", TDV "Popasnyansky Car Repair Plant" are analyzed. It was determined that the most affected of the studied domestic enterprises under the conditions of quarantine measures were JSC "Ukrzaliznytsia", PJSC "KVBZ", TDV "Popasnyansky Car Repair Plant". The main reasons for the decrease in technical and economic indicators at domestic enterprises of transport machine-building and the railway industry are studied by the method of expert evaluation. According to the analysis of expert evaluation data, the most important reason for the deterioration of technical and economic indicators of enterprises is the lack of state support and incentives for the development of transport machine-building and the railway industry in the country (19.6%). Experts estimate the impact of the consequences of the introduction of quarantine measures to counter the COVID-19 pandemic at 8.1%. Measures are proposed to improve the technical and economic performance of the most affected domestic enterprises of the transport machine-building and railway industries in the context of the COVID-19 pandemic.

DEVELOPMENT OF DIES WITH DIFFERENTIATED CLAMP FOR CUTTING BLANKS FOR PRECISION STAMPING

A large contribution to the final cost of machine-building products is made by the efficiency of blank production, in which a waste-free shear cut is used. The most promising for the implementation of the method of shear cutting are dies with a differentiated clamping of rolled products. The aim of the work is to develop a new die design with a differentiated clamping of rolled products with high technical and economic characteristics and recommendations for the design of such equipment. On the basis of the developed graph of constructions of dies with a differentiated clamping of rolled products, design features have been identified, which made it possible to create a new die design. Compared with the known structures, in the stamp of the DSEA structure, the transverse dimensions and weight are reduced by an average of 25%, and the height of the open stamped space – by 10%. In the process of dividing in the vertical plane, a constant position of the rolling axis is ensured. The transfer of force to the clamp through the rolling is excluded. The stamp has high rigidity. The stamps of the DSEA design have been introduced at the Odessa PJSC "Stroygidravlika". The economic effect of the implementation was 100000 UAH. Acceptance test results showed that the dies of the new design are efficient and reliable in operation. The quality of the cut workpieces corresponds to the quality indicators of the workpieces cut on modern similar equipment. On the basis of theoretical analysis, experimental studies and operating experience of dies with differential clamping of rolled products, known and formulated new recommendations for the design of such dies. The main ones are: it is necessary to provide a differentiated clamping of rolled products on both sides of the separation plane, subject to the condition that the clamping force should be one and a half times greater than the cutting force; the die body is preferably box-shaped to compensate for thrust forces and torsional moments of forces; the power parts of the stamp must be made in a closed form with stiffening ribs to ensure strength under cyclic stress conditions.

Methodological Support of the Competitiveness Management of the Machine-Building Complex of the Republic of Belarus on the Basis of the Strategic Business Units Creation

In the context of a rapidly changing economic reality, the management of large industrial complexes at the macro level has been become increasingly complex and difficult to predict. Directly, the ability to find, create, and combine new and existing conceptual foundations of management policy that have not been used before, but take into account the trends and features of certain socio-economic systems provides an opportunity to develop and create a flexible, adaptive management competitive mechanism that allows, depending on the circumstances, both to re-develop the system from the inside and adjust it to the existing conditions of the macro-environment. Thus, management becomes the main strategic resource that ensures the competitive advantage of the socio-economic system, as well as its’ “survival”, adaptation, transformation and development. The machine-building complex of the Republic of Belarus is an example of a multidimensional volumetric socio-economic system that requires large management costs to increase and strengthen its competitive capabilities and potential. This article is devoted directly to the development of methodological tools for managing the competitiveness of the machine-building complex of the Republic of Belarus, taking into account the features and conditions of its functioning.