Teoretičeskaâ i prikladnaâ nauka Theoretical & Applied Science 07 (87) 2020 International Scientific Journal Theoretical & Applied Science Founder: International Academy of Theoretical & Applied Sciences Published since 2013 year. Issued Monthly. International scientific journal «Theoretical & Applied Science», registered in France, and indexed more than 45 international scientific bases. Editorial office: http://T-Science.org Phone: +777727-606-81 E-mail: [email protected] Editor-in Chief: Hirsch index: Alexandr Shevtsov h Index RISC = 1 (78) Editorial Board: 1 Prof. Vladimir Kestelman USA h Index Scopus = 3 (38) 2 Prof. Arne Jönsson Sweden h Index Scopus = 10 (33) 3 Prof. Sagat Zhunisbekov KZ - 4 Assistant of Prof. Boselin Prabhu India - 5 Lecturer Denis Chemezov Russia h Index RISC = 2 (61) 6 Senior specialist Elnur Hasanov Azerbaijan h Index Scopus = 7 (11) 7 Associate Prof. Christo Ananth India h Index Scopus = - (1) 8 Prof. Shafa Aliyev Azerbaijan h Index Scopus = - (1) 9 Associate Prof. Ramesh Kumar India h Index Scopus = - (2) 10 Associate Prof. S. Sathish India h Index Scopus = 2 (13) 11 Researcher Rohit Kumar Verma India - 12 Prof. Kerem Shixaliyev Azerbaijan - 13 Associate Prof. Ananeva Elena Pavlovna Russia h Index RISC = 1 (19) 14 Associate Prof. Muhammad Hussein Noure Elahi Iran - 15 Assistant of Prof. Tamar Shiukashvili Georgia - 16 Prof. Said Abdullaevich Salekhov Russia - 17 Prof. Vladimir Timofeevich Prokhorov Russia - 18 Researcher Bobir Ortikmirzayevich Uzbekistan - Tursunov 19 Associate Prof. Victor Aleksandrovich Melent'ev Russia - 20 Prof. Manuchar Shishinashvili Georgia - ISSN 2308-4944 0 7 © Сollective of Authors 9 7 7 2 3 0 8 4 9 4 2 0 1 © «Theoretical & Applied Science» International Scientific Journal Theoretical & Applied Science Editorial Board: Hirsch index: 21 Prof. Konstantin Kurpayanidi Uzbekistan h Index RISC = 8 (67) 22 Prof. Shoumarov G'ayrat Bahramovich Uzbekistan - 23 Associate Prof. Saidvali Yusupov Uzbekistan - International Scientific Journal Theoretical & Applied Science ISJ Theoretical & Applied Science, 07 (87), 492. Philadelphia, USA Impact Factor ICV = 6.630 Impact Factor ISI = 0.829 based on International Citation Report (ICR) The percentage of rejected articles: ISSN 2308-4944 0 7 9 7 7 2 3 0 8 4 9 4 2 0 1 ISRA (India) = 4.971 SIS (USA) = 0.912 ICV (Poland) = 6.630 ISI (Dubai, UAE) = 0.829 РИНЦ (Russia) = 0.126 PIF (India) = 1.940 Impact Factor: GIF (Australia) = 0.564 ESJI (KZ) = 8.997 IBI (India) = 4.260 JIF = 1.500 SJIF (Morocco) = 5.667 OAJI (USA) = 0.350 QR – Issue QR – Article SOI: 1.1/TAS DOI: 10.15863/TAS International Scientific Journal Theoretical & Applied Science p-ISSN: 2308-4944 (print) e-ISSN: 2409-0085 (online) Year: 2020 Issue: 07 Volume: 87 Published: 19.07.2020 http://T-Science.org Denis Chemezov Vladimir Industrial College M.Sc.Eng., Corresponding Member of International Academy of Theoretical and Applied Sciences, Lecturer, Russian Federation https://orcid.org/0000-0002-2747-552X [email protected] Vladimir Goremykin Vladimir Industrial College Master of Industrial Training, Russian Federation Aleksey Kuzmichev Vladimir Industrial College Head of Workshops, Russian Federation Irina Pavlukhina Vladimir Industrial College Lecturer, Russian Federation MODES ANALYSIS OF ELECTRICAL DISCHARGE MACHINING WITH COPPER, GRAPHITE AND STEEL ELECTRODES Abstract: Influence of the active electrode surface, peak current and voltage on the material removal rate from the workpiece, relative wear of the electrode and the machined surface roughness during electrical discharge machining of steel, titanium, cemented carbide, copper and aluminium was determined in the article. The modes parameters that most affect the productivity of electrical discharge machining with the copper, graphite and steel electrodes and the quality of the machined surface of the workpiece were determined using the obtained analytical equations. Key words: the electrode, electrical discharge machining, the workpiece, steel, graphite, copper. Language: English Citation: Chemezov, D., Goremykin, V., Kuzmichev, A., & Pavlukhina, I. (2020). Modes analysis of electrical discharge machining with copper, graphite and steel electrodes. ISJ Theoretical & Applied Science, 07 (87), 1-4. Soi: http://s-o-i.org/1.1/TAS-07-87-1 Doi: https://dx.doi.org/10.15863/TAS.2020.07.87.1 Scopus ASCC: 2209. Introduction The productivity of EDM is understood as the Electrical discharge machining (EDM) is not the material volume removed from the workpiece per unit high productivity technological process. However, of time. Wear resistance of the electrode affects the cavities of the various geometric shapes on the quality of the machined surface of the workpiece. machined parts can be obtained by means of the Simultaneous combination of the high productivity of special electrode. Providing the electrical discharge EDM and the quality of the machined surface is the machine with the numerical control system allows to complex process, because it is necessary to take into perform EDM with high accuracy. Thus, this EDM of account the large number of the modes, the materials various materials is rational to carry out in the properties of the workpiece and the electrode, the conditions of the individual or small-scale technical requirements for manufacturing the part, etc productions. [1-10]. Mathematical processing of the experimental Philadelphia, USA 1 ISRA (India) = 4.971 SIS (USA) = 0.912 ICV (Poland) = 6.630 ISI (Dubai, UAE) = 0.829 РИНЦ (Russia) = 0.126 PIF (India) = 1.940 Impact Factor: GIF (Australia) = 0.564 ESJI (KZ) = 8.997 IBI (India) = 4.260 JIF = 1.500 SJIF (Morocco) = 5.667 OAJI (USA) = 0.350 data will allow to determine the optimal modes for rotation speed (ω) – 5…10 rpm; the planetary high productive finish EDM of various metals and tolerance (Tol) – 0.008…0.016 mm; the planetary feed alloys and make the forecast about wear resistance of increment (Inc) – 0.018…1.4 mm; the impulse the electrode. undersize (M) – 0.006…1.8 mm; the impulse undersize finishing (2gap) – 0.006…1.04 mm. Fp, I, Materials and methods and U were adopted as the independent factors. The 3 The analysis of the values changing of the material removal rate Vw (mm /min), relative wear of material removal rate, relative wear of the electrode the electrode θ (%), and the machined surface and the machined surface roughness of the workpiece roughness of the workpiece Ra (μm) were adopted as in the conditions of the modes changing of EDM was the dependent factors. the experiment purpose. EDM was carried out on the Form 30 electrical discharge machine. Steel was Results and discussion machined with the steel and graphite electrodes; steel, The experiment results were mathematically titanium, cemented carbide, aluminum and copper processed and presented graphically. The were machined with the copper electrode. The dependencies of the material removal rate from the following modes were adopted for machining all active electrode surface, relative wear of the considered materials: the active electrode surface (Fp) electrodes from the value of peak current and the – 0.0008…20 cm2; peak current (I) – 0.8…104 A; on machined surface roughness of the workpiece from time (T) – 1…749.9 μs; the capacitance (S-box) – voltage are presented in the Fig. 1-3. 0…127 pos; polarity (Pol) – -…+; off time (P) – The removal rate of all materials increases with 1.2…177.8 μs; compression (Comp) – 10.2…40%; increasing the active electrodes surface. It was noted the gain (Gain) – 8…25 pos; voltage (U) – 60…250 that the maximum removal rate occurs during EDM of V; the ACC/ACO sensitivity (MS) – 0%; the mode aluminum with the copper electrode. EDM of (Mode) – 10…11 pos; the oscillator mode (OM) – 3 cemented carbide is characterized by the low pos; the servo mode (SM) – 0 pos; the planetary productivity. Figure 1 – The dependencies of the material removal rate during EDM from the active electrode surface. Figure 2 – The dependencies of relative wear of the electrodes from the value of peak current. Philadelphia, USA 2 ISRA (India) = 4.971 SIS (USA) = 0.912 ICV (Poland) = 6.630 ISI (Dubai, UAE) = 0.829 РИНЦ (Russia) = 0.126 PIF (India) = 1.940 Impact Factor: GIF (Australia) = 0.564 ESJI (KZ) = 8.997 IBI (India) = 4.260 JIF = 1.500 SJIF (Morocco) = 5.667 OAJI (USA) = 0.350 Figure 3 – The dependencies of the machined surface roughness of the workpiece from voltage. The value of wear of the electrode leads to the The multiple regression equations allow to similar value of the shape deviation of the machined determine the factors that most and least affect the surface of the workpiece. Relative wear of the analyzed results. The analytical formulas for the electrodes decreases at the large values of peak calculation of the material removal rate, relative wear current. EDM of cemented carbide with the copper of the electrode and the machined surface roughness electrode is the exception. Minimal wear in this case of the workpiece and the factors that most affect the is observed at peak current of 10 A. Peak current up to productivity of EDM and the quality of the machined 10 A leads to relative wear of the electrodes in the surface are presented in the table 1. range of 15-50% during EDM of other materials. All calculated equations have three independent Aluminum machining is recommended to be variables, with the exception of the equations for performed at peak current of more than 10 A, since determining the steel removal rate, relative wear of the relative wear of the copper electrode in this case does steel electrode, and the machined surface roughness of not exceed 1%. the steel workpiece. The value of the active electrode Finish EDM is carried out at high voltage (from surface has the most influence on relative wear of the 200 to 250 V). Semi-finish EDM occurs in the range tool. The value of peak current affects the machined from 100 to 180 V.