Ukrainian Journal of Mechanical Engineering and Materials Science

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Author: search.filters.author.Vasylchenko, YanaHas files: Yes

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    Selection of a rational method for hardening carbide cutting tools for heavy engineering
    (Видавництво Львівської політехніки, 2023-02-28) Kovalev, Viktor; Klymenko, Galyna; Vasylchenko, Yana; Shapovalov, Maksym; Manokhin, Andrey; Donbass State Engineering Academy; V. Bakul Institute for Superhard Materials NAS of Ukraine
    An important task is to improve cutting tools for high-precision productive machining of difficult-to-machine materials by applying the latest tool hardening methods. This is especially true for carbide-cutting tools. The paper analyzes the current state of the problem of improving the tooling of new machine tools for high-precision productive machining of hard-tomachine materials. The main known methods of increasing the wear resistance and strength of carbide tools can be divided into the following groups: structural methods; mechanical hardening; wearresistant coatings; chemical and thermal treatment; laser hardening; plasma-arc hardening; radiation hardening; ionic alloying; magnetic abrasive treatment; and pulsed magnetic field treatment. The choice of a particular hardening method depends on many factors that determine its effectiveness and costs in certain production conditions. The conditions for machining large-sized parts at heavy engineering enterprises are analyzed. It was found that, along with wear, the destruction of the cutting part in the form of pitting and fracture is significant. Statistical studies have proven that when machining on heavy machine tools, the cutting force allowed by the machine tool mechanisms does not limit the cutting modes. The maximumvalues of forces are up to 10 times higher than their average value, which is usually used to calculate the design parameters of cutting tools An analysis of various methods for improving the physical and mechanical properties of carbide tool materials has shown that the best combination of cost and production efficiency is observed in pulsed magnetic field treatment. The use of magnetic fields in cutting processes and tool hardening is a promising area of high-technology development in machining. Increasing tool life can be achieved by the influence of a magnetic field either on the conditions of the cutting process or on the structure and physical and mechanical properties of tool materials with ferromagnetic components.
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    Mathematical modelling of flux-cored layer formation
    (Видавництво Львівської політехніки, 2023-02-28) Kassov, Valery; Vasylchenko, Yana; Berezhnaya, Elena; Malyhina, Svetlana; Donbass State Engineering Academy
    Mathematical model for the calculation of the chemical composition of deposited metal with sufficient accuracy has been developed. The presented mathematical model has been developed taking into account shares of base and clad metal, the metal of the previous roll in the subsequent one, and the relative step of cladding. Based on the calculated composition of deposited metal by flux-cored wire it has been proved and experimentally confirmed that the required chemical composition of deposited metal is achieved in the second-third layer regardless of the surfacing step. Theoretically established and experimentally verified the effective relative step of cladding. The established relative pitch allows for minimizing waste when cladding with flux-cored wire. In this case, the cross-sectional area of the roll reinforcement after the finishing run will be minimal.