OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 5 No. 1 2023 connected with the structure of polymer composites and the special features of its behavior in mechanical effect of the cutting blade. The process of composite cutting differs from cutting metallic materials, and it is not always possible to apply conventional approaches when selecting an edge tool [27, 29]. When processing composite polymers with cutting, tool materials should have specific physical and mechanical properties, have high wear resistance and hardness, which provides the performance of the tool and increases the production efficiency [33, 34]. To performmulti-criteria analysis under the proposed methods, the following allowances and limitations are accepted. The constructions of the tools (facilities for comparison Oi) have the similar design and geometrical parameters, selected under the previous studies [27, 29, 33, 34], but differ in the material of the cutting part, equipped with the following tool materials: WC-2Co, WC-8Co, WC-15Co, WC-3Co, WC2TaC-6Co, WC-5TiC-10Co. Under the previous studies, in order to improve the conditions and reduce the periods of organizational and technological preparation of the cutting tool when implementing the processing technologies, achieving rational tool performance in conjunction with ensuring the required quality of the machined surface and intensifying the processing performance of polymer composite materials, it is recommended to use: 1. Нigh-tensile tool materials to equip the cutting part of the instrument. The options for the tool materials are specified above. 2. Сutting modes when processing composite materials: feed per tooth S = 0.15…0.17 mm/tooth, depthof-cut t = 0.5…0.6 mm, rotations n = 6 000 min–1 – with these parameters, the maximal cutting speed is achieved (within the limits allowed by processing equipment). 3. Geometrical parameters of the tool are set within the following limits: rake angle γ = 15…20°, clearance angle α = 10…15°, taper angle β = 55…60°. The cost of carbide blades for mills were received from Kirovgrad Hard Alloys Plant. The cost of the mills is calculated at high level considering the cost for the production under the laboratory conditions. The physical and mechanical properties of the tool materials are given for reference only. The baseline data for analysis are presented in Table 1. At present, the rational selection of the tool material for the specified enterprise conditions is a necessary stage of production design process. The performance criteria of edge cutting machining technology of polymer composites include the following: the functional capability, performance and economic efficiency. The blade life is the parameter of the functional capability of a cutting tool. The definition of this value depends on significant values for such processing parameters as technological cutting modes, tool materials, workpiece material properties, the geometrical parameters of the tool. Taking the results of the blade life tests at the given combination of the workpiece material and tool material (experimental system) as the input data, it is possible to determine the calculated (predicted) blade life of the cutting tool at any combination of materials (calculation system) as follows [27]: e T T T K = , min, where – the experimental period of blade life at the known combination of the materials, min; T K – coefficient of variation of the blade life period, which depends on the combination in the tool system of the physical, mechanical and operational parameters of the tool and the workpiece material, studied (predicted) and obtained empirically earlier. The complete calculation of production efficiency and functional capability of the tool is made under the developed method [27, 29]. When determining the criterion of economic efficiency, it is necessary to determine production costs. The calculation of economic effect is made under the developed method [35]. The results of the calculation are presented in Table 2.
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