OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 6 4 4 The measurement strategy is a polyline. The measurement was performed in such a way as to maximize the use of the entire surface. As a result, statistics from 200 points in three x, y, z coordinates were collected. To test the obtained metallic TE, an experiment was conducted on CPEDM of steel 45 (0.45 % C). The processing was performed on a CPEDM Smart CNC machine in the environment of industrial oil grade I-20a GOST 982-80. The CPEDM mode is presented in Table 3. Ta b l e 3 Machining mode on the copy-piercing EDM machine Parameters Values max I, А 8 U, V 50 Ton, μs 100 Results and discussion Fig. 5 shows the cellular structure of the internal fi lling of the investment patterns. Fig. 5. Cell fi lling with the structure of a face-centered Wigner-Seitz cubic lattice The Calypso software package shows the average fl atness deviations on surfaces 1–4 (Fig. 6) of all fi ve TE samples. The approximation method was used to model the fl atness deviation error line. A data sampling of twelve points for each plane was made for visualization. The points were selected on the measurement line where it breaks. The sampling data for surface 1 is presented in Table 4. The location of these points is shown in Fig. 7. An approximation line is drawn through these points, indicating the average actual size of the master models. Table 5 shows the fl atness deviations of the samples of all measured surfaces and the average value. It is necessary to take these deviations into account and add it to the original CAD model to create a new geometry of the part. To eliminate the resulting deviation, a new dimension is calculated that compensates for the shape deviation and is equal to the average size of the fl atness deviation. Fig. 8 shows the changes in the part shape geometry on surfaces 1–4.
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