Obrabotka Metallov 2019 Vol. 21 No. 1

OBRABOTKAMETALLOV Vol. 21 No. 1 2019 22 TECHNOLOGY References 1. Rasporyazhenie prezidenta OAO “RZhD” ot 17.01.2005 № 3r “O sisteme tekhnicheskogo obsluzhivaniya i remonta lokomotivov” [The order of the President of JSC “Russian Railways” dated 17.01.2005 N 3r “About system of maintenance and repair of locomotives”]. Moscow, JSC “Russian Railways” Publ., 2005. 8 p. 2. Rasporyazhenie prezidenta OAO “RZhD” ot 13.01.2006 № 181 “Dopolnitel’nye mery po povysheniyu urovnya obespecheniya bezopasnosti dvizheniya v lokomotivnom khozyaistve zheleznykh dorog OAO “RZhD” [The order of the President of JSC “Russian Railways” dated 13.01.2006 N 181 “Additional measures to improve the level of Yurij Titov 1, a, * , Dmitrij Belan 2, b , Georgij Toder 2, c , Аnna Otradnova 2, d 1 Omsk State Technical University, 11 Mira ave., Omsk, 644050, 2 Omsk State Transport University, 35 Prospekt Marksa, Omsk, 644046, Russian Federation a http://orcid.org/0000-0002-6454-8310, tyrin-88@mail.ru , b http://orcid.org/0000-0002-7168-103X , Baltazar.13@mail.ru , c http://orcid.org/0000-0001-5000-7137, georgyt@mail.ru , d https://orcid.org/0000-0001-7801-753X , anna3812_88@mail.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2019 vol. 21 no. 1 pp. 16–24 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2019-21.1-16-24 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 21 October 2018 Revised: 15 January 2019 Accepted: 29 January 2019 Available online: 15 March 2019 Keywords : Traction electric motor Collector Pulse generator Carbon Electrical discharge machining ABSTRACT Introduction. One of the most important tas For citation: Titov Yu.V., Belan D.Yu., Toder G.B., Otradnova A.A. Improving the reliability of locomotive traction motors due to the use of electrical discharge machining of collector plates. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2019, vol. 21, no. 1, pp. 16–24. doi 10.17212/1994-6309-2019-21.1-16-24. (In Russian). ______ * Corresponding author Titov Yurij V., Assistant Omsk State Technical University 11 Mira ave., 644050, Omsk, Russian Federation, Tel.: +7 (913) 681-56-64, e-mail: tyrin-88@mail.ru Russian Federation Improving the Reliability of Locomotive Traction Motors due to the use of Electrical Discharge Machining of Collector Plates ks of locomotive repair production of Russian Railways is to increase the service life of the rolling stock: locomotives and wagons. This paper discusses the use of a new method of repair of collector-brush unit of the electric locomotive, which will improve the switching characteristics, improve the reliability of electric traction motors (ETM) and increase the operating time of the entire electric locomotive as a whole. The purpose of the work is to improve the reliability and service life of ETM of electric locomotives. Methods. To reduce the coefficient of friction between the collector plates and brushes and increase the service life of the collector-brush unit, it is proposed to carburize the surface standing copper plates of the collector by means of electrical discharge machining (EDM). The method of electrical discharge machining, in comparison with traditional mechanical methods of repair of electric traction motors, is more preferable, because it allows increasing the wear resistance of the contact surface of the collector plates, which provides the required performance properties and increases the reliability of the collector-brush unit. Results. The article proposes a technological process of repair of the electric motor collector, characterized by the use of electrical discharge machining with the formation of a carbon surface layer on the contact surface of the collector. A device for the formation of a carbon layer on the working surface of the collector of electric traction motors by means of electrical discharge machining is presented. The results of atomic emission spectral analysis of carbonized copper sample, which showed that the proportion of carbon in the carbonized copper sample increased by 0.1 % compared to the copper plate, not subjected to electrical discharge machining, are given. An evaluation model of the dependence of the depth of the composite layer on the voltage applied to the electrodes is presented. Discussion. the evaluation model Presented in the article allows: 1) to make a preliminary estimate of the dependence of the depth and thickness of the layers forming the composite structure of the surface subjected to EDM on the voltage applied to the electrodes; 2) based on this calculation, to conduct an experimental EDM of the collector surface of the ETM with the adjustment of the thickness and depth of the layers by means of the described technique; 3) to experimentally determine the processing modes for the samples.