OBRABOTKAMETALLOV Vol. 24 No. 4 2022 technology Fig. 1. A sample of deposited material Ta b l e 1 Chemical composition and the size of the powder main fraction Chemical element The powder main fraction size, µm Fe Co Cr Mo Concentration, at. % 68 15 15 2 40 – 120 The machining was out on a CNC milling machine model GF2171S5. For milling the sample, end mills with a diameter of 8 mm made of R6M5 (HSS-G) material were used. The cutters with 13º and 19º clearance angles in the end section were used to compare the output parameters of the cutting process. Structurally, in most cases, end mills are made with clearance angles, the value of which varies from 13º to 19º. The boundary values of the angles were selected for the experimental study. Guided by the regulatory reference book for the processing of stainless steels [20], the corresponding technological parameters of the milling process were selected. The technological parameters of the experiment, including the characteristics of the cutting tool, are presented in Table 2. To measure the cutting force, a Kistler 9257B dynamometer was used, on which a plate with a deposited material was installed and fixed with screws. The processing of experimental data was carried out using DynoWare software. The machined surface roughness was measured by a contact profilometer model 130 with an accuracy degree 1 according to GOST 19300 – 86. Single-factor regression analysis was used to develop mathematical models of the relationship between the machined surface roughness and the cutting force with the feed per tooth. Ta b l e 2 Technological parameters Feed per tooth Sz, mm/tooth Spindle speed n, rpm Cutting depth t, mm Cutting tool diameter D, mm Cutting tool material 0.01 1,000 0.5 8 HSS M2 0.02 0.03 0.04
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