OBRABOTKAMETALLOV Vol. 24 No. 4 2022 technology Fig. 8. Dependences of the cutting force component Fyz on the feed per tooth Sz The results of regression analysis provided us with graphical dependences (Fig. 8) and power functional dependences of the cutting force component Fyz on the feed per tooth Sz for the tool with clearance angles of 13º and 19º, respectively: = 0.65 2037.49 yz z F S , (1) = 0.98 9820.20 yz z F S . (2) Machined surface roughness Measurements of the machined surface roughness were made five times for each feed; the results are presented in Table 4. From the data, it can be seen that an increase in the feed per tooth leads to an increase in roughness. The machined surface roughness is higher at small feeds for the tool with a large clearance angle. To establish the dependence of the machined surface roughness on the tooth feed, a regression analysis was carried out, which made it possible to obtained graphic (Fig. 9) and power functional dependences of the machined surface roughness Ra on the feed Sz for the tool with clearance angles of 13º and 19º, respectively: = 1.019 93.94 z Ra S , (3) = 0.75 41.85 z Ra S . (4) The use of the dependencies enables to predict the output parameters of the machining process when varying the feed per tooth. Conclusions The obtainedmathematical models of the relationship between the cutting force (1), (2) and the roughness of the machined surface (3), (4) with the feed per tooth have the form of power-law dependence. The use of these models enables to predict the machined surface roughness and the cutting force while cutting the DMD-produced material under the given conditions.
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