OBRABOTKAMETALLOV TECHNOLOGY Vol. 24 No. 2 2022 Jet or side fl ushing is carried out with tubes or fl ushing nozzles. These nozzles direct the dielectric fl uid into the gap. This is shown in Figure 4. Effi ciency of fl ushing in the case of EDM of deep holes in PCM with a complex geometry of electrode fl ushing channels has not been practically studied in full. Existing models in the processing of PCM by electrical discharge can be obtained using theoretical simulation in fi nite element analysis software systems, including Ansys. An urgent task is to obtain a theoretical model. This model will make it possible to evaluate the infl uence of the fl ushing method on the effi ciency of the EDM of PCM products based on numerical simulation in fi nite element analysis software systems. The aim of the work is to increase the productivity of the process of EDM of products made from PCM. Tasks. 1. Carry out a theoretical analysis of the effect of fl ushing the nozzles of the working fl uid on the process of the EDM of products made from PCM. 2. To carry out an experimental study of the performance of the process of EDM of products made from PCM and verifi cation of the theoretical model of the performance of EDM of products made of PCM. Materials and methods Experimental studies were carried out according to the method described in [4, 5, 19]. ET made of copper M1 was chosen for experiments. The workpiece was made of PCM grade VKU-39. The workpiece was processed on a copy-piercing electrical discharge machine Smart CNC at a constant voltage U = 50 V, pulse on time Ton = 100 μs and current I = 10 A [4, 5, 19]. ANSYS CFX 20.1 software was used for theoretical fl ow simulation. Transformer oil (Engineer oil) was chosen to calculate the main fl ow directions and velocity distribution in the interelectrode gap. The oil temperature was set as standard, equal to 25 oC. For all cases, the pressure was 2.1 kg/cm2 = 0.205 MPa. Flows distribution simulation was carried out at three values of the processing depth (2 mm, 10 mm, 15 mm), as well as at three values of the inclination angle of the nozzles (15°, 45°, 75°) (Figure 2–4). Fig. 3. Partial tracing in the gap between the electrode and the workpiece. The average particle velocity is approximately 0.75 m/s Fig. 4. Scheme of jet or side fl ushing
RkJQdWJsaXNoZXIy MTk0ODM1