OBRABOTKAMETALLOV TECHNOLOGY Vol. 24 No. 2 2022 2.247 mm at _ max 56.21 I p h mm. In this case, the value 2 ECR of the processed area should decrease by 0.48 mm and amount to 2 11.527 ECR mm. According to the results of virtual simulation of the machining process in CAD NX for the value of _ max I p h , followed by the determination of the geometric parameters of shape accuracy, the maximum depth of cut tk_max was 1.957 mm (Fig. 9, a). The value 2 ECR of the processed area decreased by 0.34 mm and amounted to 2 11.667 ECR mm (Fig. 9, b). Accordingly, the actual output parameters of the geometric accuracy of the shape of the machined section M-1 were slightly worse than the calculated ones. The obtained data was transferred to correct the machining route. Fig. 9. Round diagram of the shape deviation of the contour of the processed surface area at the 1st transition: a – before processing; b – after processing a b The calculation and simulation of processing showed that the proposed processing scheme allows at each individual transition to correct the geometric accuracy of the shape only to the fi nal value. So, for example, at the 2nd transition the maximum value of 1 ECR achieved for the processed M-1 area was 11.365 mm (Fig. 10, a). Besides, in case 2 _ max p h exceeds the calculated value, a decrease in the radius of the inscribed cylinder RCc is observed. The further machining route also assumed the processing of two adjacent surface sections M-1 and M-2, between sections No.1 and No.2 until the standard value of k ECR was reached. At the same time, before each technological transition, the main technological base was changed to the area processed at the previous transition with a minimum value of k ECR . According to the calculations, the standard value of the radial runout is achieved in the M-2 are in 51st technological transition according to OST 22-170-87 for the weld-in riding ring of a cement kiln with a
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