У статті представлено результати досліджень якості поверхневих шарів (мікроструктури, мікротвердості, шорсткості та суцільності) зразків з бронзи БрО10С10 з комбінованими електроіскровими покриттями. Досліджено покриття трьох серій: 1) без сульфідування (Ag → Pb → Ag і
Special digging machines are used currently in many countries when laying underground utility systems of various types. They are designed to form holes with a complex path. Vermeer, Straight Line, Ditch Witch (USA), Tracto Technik (Germany) are the world's leading manufacturers of such machines [1]. However, initial hole entry for these
The paper discusses the process of normal friction and wear as a result of fretting corrosion, as well as measures to reduce its level. There are considered the issues of reliability and accuracy of the connection of “shaft - sleeve with key” type, which is of particular danger. The disadvantages of the considered connections are shown, namely the relative complexity of the disassembly-assembly processes; high level of stress concentration; the tendency to corrosion at contact. There has been proposed a physically based mathematical model of the wear process for the strengthened surfaces of the flexible coupling parts on the friction conditions. By using the friction work value, the model allows determining the wear expressed through the change in the surface roughness. A method has been developed for determining the constant of the wear equation for various materials of friction pairs. Using the energy and economic criteria, the technique of the integral description of the method for achieving the required quality of the surface layers of the elastic coupling parts is given. A mathematical model has been developed to reliably allow predicting the wear amount for the surfaces of the elastic coupling parts whose surface layers are formed in various ways. It is proposed a system for the directed choice of the technologies to produce the surface layers of the flexible coupling parts taking into account all the stages of their life cycles. In doing so, both economic and environmental requirements are also taken into consideration. The use of the system for the direct choice of the technology to ensure the required quality of the flexible coupling parts at the repair stage allows more economically solving the problem of restoring their performance. As practice shows, at this stage, the application of the results of the scientific research gives a significant economic effect.
The relevance of the study is explained by the fact that the combination of branches of livestock farming and crop production within agrarian enterprises creates a certain complexity in the use of material, labour and land resources and makes it necessary to create an optimal ratio on the basis of the formation of the most perspective and efficient industries. However, the contradictory and controversial nature of the data on the impact of various interconnected factors, the presence of primarily theoretical modelling while determining the optimal level of specialization of agrarian enterprises does not allow to achieve a given level of efficiency and efficiency of functioning performance Therefore, the purpose of the research is to provide scientific substantiation of the efficiency improving directions of agrarian enterprises through their specialization improvement. They are the empirical basis of the structured choice of directions to increase the functioning efficiency of agrarian enterprises. For the crop production industry, the main direction that will increase the management efficiency is the crops productivity increase due to the production profitability increase for the most management conditions. It was determined that regional features are important for plant cultivation and animal husbandry sectors while determining the influence factors on specialization. It was found out that for both industries, the negative impact of labour security and ineffective management practices are typical, and state support through subsidies for agricultural enterprises does not guarantee the increase in the production efficiency.
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