OBRABOTKAMETALLOV technology Vol. 24 No. 4 2022 Ta b l e 4 Roughness of the machined surface Cutting tool with a 13º clearance angle Feed per tooth Sz, mm/tooth Roughness of the machined surface Ra, µm Point No. 1 2 3 4 5 0.01 0.91 0.92 0.89 0.98 0.89 0.02 1.58 1.44 1.76 1.53 1.79 0.03 2.42 2.35 2.42 2.23 2.32 0.04 4.01 3.98 4.11 4.13 3.94 Cutting tool with a 19º clearance angle Feed per tooth Sz, mm/tooth Roughness of the machined surface Ra, µm Point No. 1 2 3 4 5 0.01 1.44 1.43 1.45 1.46 1.40 0.02 1.75 1.78 1.74 1.80 1.74 0.03 3.11 3.33 3.12 3.14 3.21 0.04 3.93 4.11 3.85 3.95 3.81 Fig. 9. Dependences of the machined surface roughness Ra on the feed per tooth Sz The measured cutting forces allowed to establish that the maximum values of cutting force range from 113.16 to 315.98 N and from 119.47 to 471.75 N for cutting with clearance angles of 13° and 19° when changing feed from 0.01 to 0.04 mm/tooth respectively; machined surface roughness ranges from 0.89 to 4.13 μm and from 1.4 to 4.11 μm for the first and second tool respectively. At low feed rates, there is a noticeable difference in the machined surface roughness; hence, it can be assumed that cutters with a smaller clearance angle should be used at the finishing stage of machining. Further research on different factors of the cutting process is planned. The base formed as a result of this and future studies will allow the rational assignment of cutting modes in the machining of deposited materials, which will increase the efficiency of technological operation design. The design of mechanical operations takes into account such basic criteria of machining quality as accuracy, which is influenced by cutting force, and roughness. As a consequence, it is necessary to build up a theoretical base on machinability of DMD-produced materials.
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