Перегляд за Автор "Romanishina, Olga"

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  • Ескіз
    Документ
    Modelling of contact interaction for a tool in the conditions of outgrowth
    (Хмельницький національний університет, 2023) Mylko, Volodymyr; Sokolan, Iuliia; Savytskyi, Yuriy; Romanishina, Olga
    Modelling of machining processes with a cutting tool is currently an important stage for determining machining performance, cutting tool wear, and ultimately evaluating the effectiveness of its use. Such virtual studies make it possible to predict the service life of the cutting tool. Modern СAE systems allow such calculations to a certain extent, but cannot always take into account all the specific properties of the processing process, in particular, such a phenomenon as growth formation. The growth phenomenon makes serious changes in the cutting process itself by changing the actual angles and affecting the heat transfer processes. Therefore, the task of machining processes with a cutting tool in the conditions of growth formation is relevant. These processes occur in one way or another during processing with almost all types of cutting tools, in particular cutters. The paper substantiates that, regardless of the initial shape of the cutting blade, the main part of the contact zone can be reduced to the contact between the chip and a flat full or shortened front surface, and a method of thermophysical analysis of the cutting zone is proposed, which takes into account the equivalent coefficients of thermal conductivity of the cutting blade, composed of materials of growth and tool The practical implementation of this approach made it possible to determine that the stable shape of the wear chamfer and the associated valid law of tangential stresses take place when the back surface of the tool and the cutting surface are in full contact and the wear intensity is uniform at each point of contact.
  • Ескіз
    Документ
    Regenerating Etching Solutions for Circuit Boards while Extracting Copper
    (Journal of Ecological Engineering, 2024-04-24) Nester, Anatoliy; Yakovyshyna, Tetiana; Salamon, Ivan; Sheludchenko, Lesya; Liubynsky, Oleksandr; Romanishina, Olga; Dzhumelia, Elvira
    The examination of sludge derived from electroplating manufacturing, printed circuit board production, and paste-like residue from sludge collectors uncover elevated levels of chromium, nickel, copper, cadmium, and various metals. The considerable saturation of water in the region and diverse soil compositions complicate the identification of suitable waste disposal sites, specifically for electroplating byproducts, limiting available spaces and fostering conditions conducive to soil and water contamination by heavy metal ions. The retention of used etching solutions within industrial facilities contributes to environmental pollution, necessitating substantial expenditures for proper disposal at manufacturing sites. Industrial waste, notably from processes such as printed circuit board etching, represents a significant threat to water quality, encompassing various essential technological processes for the production of diverse electronic equipment serving both civilian and military purposes. This article aims to present research outcomes and conducted experiments geared towards developing eco-friendly equipment. Also, the research delves into specific procedures for obtaining concentrated copper precipitates during the regeneration of etching solutions, with the extraction process reducing the generation of waste in the form of a paste-like structure saturated with water on industrial premises. The treatment of wastewater from etching printed circuit boards can be achieved by establishing a closed production cycle for board manufacturing and extracting copper for industrial applications. Finally, the research strives to design equipment for regenerating used solutions with metal extraction in a form suitable for remelting, contributing as an element to environmental conservation. The results facilitate the establishment of a printed circuit board etching line that incorporates the reuse of spent etching solutions in the manufacturing process. For solution regeneration, it is recommended to utilize a regenerator with a titanium VT1-0 cathode. The outcomes of individual tests provide conditions for regenerating spent etching solutions and utilizing the extracted copper in the national economy.
  • Ескіз
    Документ
    Дослідження культури безпеки праці в машинобудівній промисловості
    (Хмельницький національний університет, 2025) Романішина, Ольга; Лавренюк, Іван; Romanishina, Olga; Lavreniuk, Ivan
    В роботі наведено результати досліджень сприйняття працівниками культури безпеки у виробничій машинобудівній галузі за допомогою опитувальника клімату безпеки. Результати цього дослідження стануть орієнтиром для пропозицій щодо влаштування кращих умов праці для можливості запровадження та підтримки культури безпеки.