Browsing by Author "Kuchynskyi, Yurii"

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    ОСОБЛИВОСТІ ВИГОТОВЛЕННЯ ЧАВУННИХ ДЕТАЛЕЙ ЗІ ЗНОСОСТІЙКОЮ ТА УДАРОСТІЙКОЮ ЧАСТИНАМИ З ОДНОГО РОЗПЛАВУ. FEATURES OF CAST-IRON PARTS WITH WEAR-RESISTANT AND SHATTERPROOF PARTS FROM THE SAME MELTDOWN
    (2019) Фесенко, Максим Анатолійович; Fesenko, Maksym; Фесенко, Анатолій Миколайович; Fesenko, Anatolii; Кучинський, Юрій Дмитрович; Kuchynskyi, Yurii; Филь, Руслан Сергійович; Fyl, Ruslan
    In this article the results of researches concerning new technological methods of production of cast iron parts (castings) with differentiated properties in their local parts from the base melt melted in one melting aggregate are given. It is noted that using cast iron castings with differentiated properties is a promising area of various industries for the design of new machines, mechanisms and other special equipment with improved performance characteristics. It is stressed that cast iron parts with differentiated properties, especially with the combination of parts made of wear-resistant white and shatterproof high-strength cast irons, are practically not used in industry. The most widespread foundry methods of production of cast iron with differentiated properties have been analyzed and their main drawbacks have been revealed, which promoted the development of new foundry methods and conduction of corresponding researches. According to the new technological methods the differentiation of cast iron structure and properties in different parts of castings is achieved due to the in-shno- form processing of the base melt flow, which is melted in one melting unit, in separate reaction chambers of the casting system of the casting mold of carbido-utvoryuvalnym and spheroidalnym additives. This makes it possible to manufacture castings with a combination of the structure and properties of wear-resistant white cast iron and high- strength high-strength cast iron with spheroidal graphite, designed for use in shock- free as well as shock-abrasive wearing. Mathematical and physical modeling and full-scale experiments were carried out, which confirmed the possibility of realization of the proposed technological methods and made it possible to establish optimal conditions and modes of formation of differentiated structures and properties in castings. The advantages of the proposed technological methods of differentiating the structure and properties of metal castings, as well as the prospects of their use in various industries for a wide range of cast products are highlighted.
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    СУЧАСНІ ТЕНДЕНЦІЇ СТВОРЕННЯ ЗАХИСНИХ ОКУЛЯРІВ ДЛЯ ПОЛІЦЕЙСЬКИХ ТА ВІЙСЬКОВОСЛУЖБОВЦІВ. CURRENT TENDENCIES OF CREATING GLASSES FOR POLICE AND MILITARY SERVICES
    (2019) Неня, Олена Володимирівна; Nenia, Olena; Березненко, Наталія Михайлівна; Bereznenko, Nataliia; Кучинський, Юрій Дмитрович; Kuchynskyi, Yurii
    Research article is devoted to the issue of creation of the protection of organ of vision of servicemen, police officers and other employees of the central executive bodies, whose activities are directed and coordinated by the Cabinet of Ministers of Ukraine through the Minister of Internal Affairs, in particular tactical and ballistic glasses and masks. Tactical-technical and qualitative characteristics of modern samples of tactical and ballistic safety glasses and masks, physical-mechanical and technical characteristics of the materials which are used and can be used for the manufacture of lenses of glasses and masks, as well as the structural features of their frames, are analyzed. For this purpose, in particular, a comparative assessment of the main characteristics of such polymer composite materials as: polymethyl methacrylate, polyacrylate, polyethyl methacrylate, copolymer of methyl methacrylate with acrylonitrile, polycarbonate, polydiethylene glycol-bis- (allyl carbonate) was carried out. On the basis of the complex of physical-mechanical and operational characteristics for the manufacture of lenses of protective tactical and ballistic glasses and masks, it is expedient, according to the authors, to use a polycarbonate composition. Attention is drawn to the fact that this polymer composition has high levels of protection against shock loads. At the same time, the refractive index, the reflection and absorption of light, the dispersion, the scattering of light in the polycarbonate composition will provide the required level of visibility, which is an important indicator of the operation of the finished product. In turn, it is advisable to use a thermal rubber or opaque polycarbonate composition to make the frames of these protective means. It is concluded that the key criteria, by which the functional qualities of these protective devices can be evaluated, are the material, from which the lenses and eyeglass frames and their manufacturing technologies are made, resistance to shock loads; structural and ergonomic features, ability to offset the effect of laser radiation in the required wavelength range; availability of a sufficient set of lenses for various purposes, in particular for use in terrain with different light levels; DX coating for protection against fogging, scratches, static electricity and chemical attack, high ergonomic performance and more.