Видання зареєстровані авторами шляхом самоархівування
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Item Ensuring the economic efficiency of enterprises by multi-criteria selection of the optimal manufacturing process(Production Engineering Committee of the Polish Academy of Sciences, Polish Association for Production Management, 2020) Kotliar, A.; Basova, Ye.; Іванов, Віталій Олександрович; Ivanov, Vitalii Oleksandrovych; Murzabulatova, O.; Vasyltsova, S.; Litvynenko, M.; Zinchenko, O.Technological assurance and improvement of the economic efficiency of production are the first-priority issues for the modern manufacturing engineering area. It is possible to achieve a higher value of economic efficiency in multiproduct manufacturing by multicriteria optimization. A set of optimality criteria based on technological and economic indicators was defined with the aim of selecting the optimal manufacturing process. Competitive variants and a system of optimization were developed and investigated. A comparative analysis of the optimality criteria and their influence on the choice of optimal machining processes was carried out. It was determined that the batch of parts made an impact on the selection of the manufacturing process.Item Development of Flexible Fixtures with Incomplete Locating: Connecting Rods Machining Case Study(MDPI, 2022) Іванов, Віталій Олександрович; Иванов, Виталий Александрович; Ivanov, Vitalii Oleksandrovych; Botko, F.; Dehtiarov, I.; Kočiško, M.; Evtuhov, A.; Павленко, Іван Володимирович; Павленко, Иван Владимирович; Pavlenko, Ivan Volodymyrovych; Trojanowska, J.The rapid development of manufacturing in recent years has led to a significant expansion of the technological capabilities of modern metal-cutting equipment. Therefore, the modern approach to intensifying production requires an advanced fixture design. Design and manufacture of flexible fixtures capable of machining similar shapes and sizes of complex geometry parts reduce setup time. The article aims to design flexible fixtures for parts such as one-piece connecting rods under incomplete locating conditions. The advantages are the minimum number of parts and tool availability for multi-axis machining connecting rods in one setup. This approach, combined with up-to-date machining centers and industrial robots, can increase the production efficiency of manufacturing non-removable connecting rods. This effectiveness is in a decrease in the number of operations by 5–7 times, fixtures—by 3–4 times, and machine tools—by 3–5 times, depending on the type of a non-removable connecting rod and its design features. The numerical simulation results of the proposed fixture design confirmed the comprehensive technological capabilities and dynamic characteristics. Particularly, a decrease in displacements and oscillation amplitudes up to 7% compared to the full-basing locating chart was provided. It is determined that the system “fixture–workpiece” entirely meets all the strength, accuracy, and rigidity parameters, which allows you to perform machining with intensive cutting modes. The amplitudes of oscillations do not exceed the tolerances on the dimensions of these surfaces, established by requirements for non-removable connecting rods, and all displacements are elastic. During numerical simulation, the workpiece position remained stable at all machining steps.Item Mathematical estimation of roughness Rz of threaded surface obtained by machining method(MM Publishing, 2022) Некрасов, Сергій Сергійович; Некрасов, Сергей Сергеевич; Nekrasov, Serhii Serhiiovych; Peterka, J.; Жигилій, Дмитро Олексійович; Жигилий, Дмитрий Алексеевич; Zhyhylii, Dmytro Oleksiiovych; Довгополов, Андрій Юрійович; Довгополов, Андрей Юрьевич; Dovhopolov, Andrii Yuriiovych; Колесник, Віталій Олександрович; Колесник, Виталий Александрович; Kolesnyk, Vitalii OleksandrovychThe paper presents a mathematical model of the helical surface roughness Rz, obtained by the form-generating method with a to-size tool with a standard profile of cutting tool inserts. This machining method has maximum productivity with large pitches of the helix. The surface roughness of the auger flight is an important parameter since it works in a friction pair with an elastic element. The resulting dependence makes it possible to predict surface roughness in any of its sections, considering the helix curvature, depending on the feed and the cutting tool tip radius. The obtained dependence allows comparing the numerical solution with the linearized one obtained by finding the minimum distance from the intersection points of the tool edge circles at helical surface adjacent cutting points to the straight line connecting these adjacent points.