OBRABOTKAMETALLOV Vol. 24 No. 2 2022 TECHNOLOGY Calculation of the tool cut-in points for each ISCD position The coordinates of point k i P (Fig. 4) corresponding to the intersection of the straight line, along which the cutting tool is moved (equation (8)) with the contour of the cross-section of surface 4 (Fig. 4), are calculated prior to processing for each of the known ISCD positions obtained during the _ max I p h calculation. Each point _ k cut m P should correspond to only one point k i P , however, in the general case, the solution has two points of intersection of the straight line (equation (8)) and the contour of the processed section of surface 4 (Fig. 4). Therefore, for further calculations, a point is taken for which the modulus of distance from the point k cut P is the smallest. Results and discussion Determination of shape accuracy parameters of a virtual riding ring model To determine the accuracy parameters of the shape of the rolling surface of the virtual riding ring model, its virtual reconstruction was carried out based on the measurement of 6 cross sections. Each section was 200 mm apart from the adjacent one, with the extreme sections coinciding with the edges of the model. A parameterized virtual model of the measuring device (Fig. 1) corresponding to the original basic patented scheme of the measuring device, as well as a software module (Fig. 5) implementing an algorithm for calculating the accuracy parameters of the cross-section shape were used for experimental measurements and to check the operability of solutions. Fig. 6 shows the calculated distribution of k TFEC for sections with the maximum and minimum value of the shape error. The combined diagram of section contours and the inscribed cylinder are shown in Fig. 7. The obtained calculation data on the accuracy parameters of the rolling surface shape are used for further analysis and development of the machining route. Construction of a machining route According to the proposed technology, the processed surface was initially analyzed according to the data on its geometric parameters of shape accuracy obtained at the measurement stage. a b Fig. 5. Software implementation of the shape calculation algorithm: a – program user interface; b – log window when calculating surface shape parameters
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