Analysis of the Contact between Frog and Metro Wheel Tread with Abnormal Wear

doi:10.3901/JME.2018.04.117

Abstract

Abstract: To investigate nose rail damage problems arose on crossings in a metro line, wheel and frog profiles are monitored. It is found that abnormal wear at end of the wheel tread (or false flange) occurs at mileage of about 31 000 km. In the meantime, groove wear is found on wing rail. Based on the measured profiles, a finite element model for wheel/frog contact is established. Combined with geometric constraint approach, both contact geometry and contact stress between wheels with different height of the protrusion and new/used frog are analysed. It is found that abnormal worn wheels with false flange are detrimental to wheel/rail contact, which leads to reduced contact area between wheel and new frog and increases the contact stress. When wheelsets move in lateral direction, abnormal worn wheels would contact with the weak part of nose rail and cause damage. Reprofiling abnormal worn wheels with false flange or proper matching relationship between brake shoes and wheel treads can eliminate the wheel abnormal wear and consequently avoid nose rail damage of frog.

Key words: abnormal wear, finite element method, metro wheel, switch and crossing, wheel/rail contact

CLC Number:

U211

ZHANG Heji, HE Zehan, LIU Jianqiao, WU Lei, WANG Hengyu, WEN Zefeng. Analysis of the Contact between Frog and Metro Wheel Tread with Abnormal Wear[J]. Journal of Mechanical Engineering, 2018, 54(4): 117-123.

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