OBRABOTKAMETALLOV Vol. 24 No. 3 2022 38 TECHNOLOGY References 1. Jeong W., Hong J., Kho H., Lee H. Rail surface quality analysis according to rail grinding on operational railway track. Journal of the Korean Society for Railway, 2021, vol. 24, iss. 10, pp. 852–860. DOI: 10.7782/ JKSR.2021.24.10.852. 2. Lundmark J. Rail grinding and its impact on the wear of wheels and rails. Licentiate Thesis, 2007. Available at: https://www.diva-portal.org/smash/get/diva2:990239/FULLTEXT01.pdf (accessed 03.08.2022). Theoretical analysis of passive rail grinding Andrey Ilinykh a,*, Viktor Banul b, Denis Vorontsov c Siberian Transport University, 191 Dusy Kovalchuk st., Novosibirsk, 630049, Russian Federation a https://orcid.org/0000-0002-4234-6216, asi@stu.ru, b https://orcid.org/0000-0002-4257-2686, banul@ngs.ru, c https://orcid.org/0000-0002-3819-781X, voroncovds@stu.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2022 vol. 24 no. 3 pp. 22–39 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2022-24.3-22-39 ART I CLE I NFO Article history: Received: 15 June 2022 Revised: 29 June 2022 Accepted: 05 July 2022 Available online: 15 September 2022 Keywords: Rail grinding Passive grinding Machining effi ciency Grinding performance Funding The research was carried out with the fi nancial support of subsidies from the Federal Budget for the development of cooperation between Russian educational institutions of higher education, state scientifi c institutions and organizations of the real sector of the economy in order to implement complex projects to create high-tech industries. Acknowledgements Research were partially conducted at core facility “Structure, mechanical and physical properties of materials”. ABSTRACT Introduction. There are different rail machining technologies designed to eliminate defects on the tread surface and extend the life cycle of rails. The most used is the technology of grinding rails with rotating grinding wheels using rail-grinding trains. Its main disadvantage is the low working speed of the grinding train that requires the organization of track possessions with stopping the movement of trains along the haul. To perform preventive rail grinding with minimal metal removal from the rail head, passive grinding technologies using grinding wheels have become widespread in last years. Passive grinding is when there is no power on the grinding wheel to rotate it actively. Such methods make it possible to achieve high speeds of the grinding train, and the work can be carried out in the train schedule without closing the stage. Currently, passive grinding technologies are relatively new and do not have the necessary scientifi c basis for optimizing the machining process. The aim of the work is to perform theoretical studies of kinematic and force analyzes of two methods of rail passive grinding: the periphery and the end face of the grinding wheel. Methodology of the work is kinematic and power calculations of rail grinding schemes. Results and discussion. Within the framework of theoretical studies, a kinematic and force analysis of two methods of passive grinding are carried out, on the basis of which the optimal conditions for its implementation are determined. It is established that the method of passive grinding by the periphery of the wheel has a 20 % higher productivity and energy effi ciency of the process before end passive grinding due to the higher rotation speed of the grinding wheel with equal forces of pressing it to the rail. At the same time, passive grinding with the end of the wheel is distinguished by a twice greater range of change in both the speed of the grinding wheel rotation and the force of its pressing that makes it possible to achieve greater metal removal at equal speeds of the grinding trains. In conclusion, promising tasks for further research in the fi eld of passive rail grinding are formulated. For citation: Ilinykh A.S., Banul V.V., Vorontsov D.S. Theoretical analysis of passive rail grinding. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) =Metal Working andMaterial Science, 2022, vol. 24, no. 3, pp. 22–39. DOI: 10.17212/1994-6309-2022-24.3-22-39. (In Russian). ______ * Corresponding author Ilinykh Andrey S, D.Sc. (Engineering), Professor Siberian Transport University, 191 Dusy Kovalchuk st., 630049, Novosibirsk, Russian Federation Tel.: 8 (383) 328-03-92, e-mail: asi@stu.ru
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