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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
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86-571-87239571
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No.9 Gaoguannong,Daxue Road,Hangzhou,China
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Abstract: Aiming at the problem of surface hardening of subway wheels and rails, in order to further reduce the wear of wheel and rails, the friction and wear of rails and two different wheel steels in an actual operating line were experimentally studied, and the effect of material surface hardening on the wear resistance of wheel and rails was discussed.First of all, the Hertz simulation criterion was used to simulate the wheel rail contact of metro vehicles under typical working conditions.Secondly, taking wheel steel and rail in service of a subway line as the research objects, parameters such as the vertical load, running speed and wheel rail sample size required for the experiment were determined. Finally, the GPM60 friction and wear test machine was used to build a test platform, and the wheel-rail contact simulation experiment was carried out.The relationship between surface hardening and metro wheel rail wear performance was analyzed and studied.The results show that the wear rate of wheel samples decreases with the increase of surface hardening. The micro alloyed metro wheel steel with higher initial hardness shows higher surface hardening degree and better wear resistance. Comparing with CL60 steel, its wear rate can reduce by 35.1%, its matching rail wear rate can increase by 7.8%, and the total wear rate of wheel and rail can reduce by 1.6%.It is recommended to perform shot peening treatment on the wheel-rail contact surface in the early stage of operation to increase the surface hardness in advance to reduce the wheel-rail running-in phase and the initial wear.
Key words: mechanical friction and wear; rail wear rate; wheel-rail; contact simulation experiment;
material surface hardening; surface hardness
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