Research On Locomotive Flange Wear

The Wheels of locomotives bear lots of loads which become worse and worse, so the fatigue reliability problem exposed of wheels becomes more and more. Ten tons of load transfer repeatedly between contact spots of wheels and rails, which area is only 120mm2 around. So, The phenomenon of rolling contact fatigue damage, such as wavy wear, rail side grinding, crushing, peel, breaking, become more serious.This paper investigate flange wear problem of locomotives SS4 in SHENGYANG railway station, and process maintenance data from SU JIATUN loco. Shed, study the relationship between locomotive flange wear volumes and stem mileage. Summarize locomotive wheels wear and draw the conclusion that there may be three stages on flange wear:the early stage, acuteness wear relatively long-term stable wear stage, rapid abrasion stage.The wear wheel-rail profiles of SS4 locomotive JM3 type and small radius curve rail type were measured with profile measuring apparatus, and wheel-rail geometrical lines were obtained by using the spline curve fitting methods, and then complete the comparison and analysis of the different wear stage of wheel/rail geometrical line. Different wear stages, the position of wear between wheel/rail acuteness differs somewhat, wheel/rail geometrical line change quantity differences exist. Flange wear is more acute than tread wear, so lead to the wheels repair early, rail side ahead of wear degree badly, wear volumes bigger, become small radius curve segment outside shares under the main reason of rail way.Three wheel-rail finite element models were built includingâ… -â…¤type wear wheels profiles and wear curve rails profiles. Then the elastic-plastic calculations were processed. The results show that the contact patch ofâ… type wear wheel -wear curve rail mainly located flange root, where high equivalent stress occurs and the area is the smallest, so the flange wear initially was acuteness, the contact patch area ofâ…¢type wear wheel-wear curve rail increased obviously, the contact stress relatively decrease, the stress distribution is evener, the wheel-rail profile is matching, the wear become slow in a stable wear stage. The contact stress ofâ…£type wear wheel-wear rail increase 3.6 times as large asâ…¢type, the high stress concentrated position gradually transferred from flange root to the wheel flange place, wheel flange become rapid wear. The contact patch of wear wheel and standard curve rail is mainly located in flange root where high equivalent stress concentrated, the area is so small and the stress is so large that it is seriously impact reason for the wheel flange and rail side wear, and seriously affects the normal performance through curve.In railway, the curve rail updated cycle far outweigh the locomotive wheels update or the cycle of repair, so different wear degrees of locomotive wheels are possible rolling on the curve standards or wear rail. The effects of wheel-rail profiles to contact mechanics behavior were analyzed. Especially the effect of wear wheel-rail profiles to locomotive flange wear.so the research provided a theoretical basis for optimizing the wheel-rail profiles and reducing wheel-rail wear...