REINFORCEMENT OF RIDGES AND REDUCTION OF WHEELSET WEAR AND TEAR
Abstract
Reducing of wear and tear of a friction pair wheel-rail is one of the main tasks to increase efficiency of railway rolling stock operation. The authors suggest analysis of technologies of thermic reinforcement of the ridges of wheelsets using comparative tests of locomotives. The results of testing of three techniques of metal working, respectively laser, plasmic and electrocontact, allow to select in the framework of comprehensive tribological approach the most reliable and promising technology.
The study has shown that the three technologies have differences as for equipment, consumables, technical conditions and staff qualifications necessary to apply them. There are also differences concerning conditions of heating and cooling of reinforced metal (one-time or cyclic heating) and ecological aspects (light radiation, noise level etc).
The reinforced zones differ in distribution of firmness and grain dimensions by depth, kinetics of temporary and residual stress, geometry and consequently in their influence on wear and tear process.
Experiments have proved that elecrocontact reinforcement permits to achieve the same results (as for reducing wear of ridges) as the plasmic hardening. When using four band zones of reinforcement the mean intensity of wearing of the ridges with electrocontact reinforcement is higher than the wearing of ridges reinforced with plasma by 0,08 мм/104 kм. If six zones of reinforcement are used, the mean intensity of wearing of the ridges is the same for plasmic and elecrtocontact hardening.
The authors suppose that electrocontact technology is more promising as it has more possibilities to positively affect the ridges wearing (by changing geometry of band zones of reinforcement, their number and location in the reinforced zone). But to correctly compare the data it is necessary to economically assess the technologies taking into account all costs resulting in comparably equal rates of wearing of ridges during operation of rolling stock.
Keywords
railway,
tribology,
locomotive,
wheelset,
ridge,
wear and tear,
reinforcement,
technology,
service testing
About the Authors
S. Yu. Petrov
Moscow State University of Railway Engineering (MIIT), Moscow
Russian Federation
D.Sc. (Tech), associate professor, head of the research and technical center of transportation technology
Russian Federation
D.Sc. (Tech), associate professor, head of the research and technical center of transportation technology
A. A. Riabov
East-Ukrainian V.Dahl University, Donetsk
Ukraine
Ph.D. (Tech), associate professor
Ukraine
Ph.D. (Tech), associate professor
A. I. Kostukevich
Moscow State University of Railway Engineering (MIIT), Moscow
Russian Federation
junior researcher
Russian Federation
junior researcher
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For citations:
Petrov S.Yu., Riabov A.A., Kostukevich A.I. REINFORCEMENT OF RIDGES AND REDUCTION OF WHEELSET WEAR AND TEAR. World of Transport and Transportation. 2013;(2):62-69. (In Russ.)
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