Research on Static Contact Behavior for Rail Grinding by Abrasive Belt Considering the Curvature Step Characteristics of Rail Profile Curve

doi:10.3901/JME.2022.15.198

Abstract

Abstract: At present, the research on the contact problem of rail grinding mainly focuses on simplifying the rail profile to the cylindrical surface level, while ignoring the fact that the rail profile curve is composed of multiple arcs.For this purpose, considering the curvature step characteristics of rail profile curve, based on the Hertz contact theory, a static contact theory model of rail grinding by abrasive belt is established.Through deducing the mathematical relationship between grinding angle and grinding contact point, and discretizing the rail profile into many slices, the stress distribution and contact spot morphology within the contact area are obtained.The numerical calculation and contact experiment for the five different grinding contact positions are implemented.The theoretical results are found to be in good agreement with the experimental results.When there is no curvature step phenomenon in the contact region, the contact spot shows the regular oval shape.On the contrary, the morphology of contact spot on both sides of the dividing line is quite different, and the difference is more obvious with the increase of normal pressure.The correctness and validity of the theoretical contact model are verified.

Key words: contact, rail profile, rail grinding, abrasive belt, curvature

CLC Number:

TG742

FAN Wengang, LIU Yi, ZHANG Xinle, WU Zhiwei, WU Changxin. Research on Static Contact Behavior for Rail Grinding by Abrasive Belt Considering the Curvature Step Characteristics of Rail Profile Curve[J]. Journal of Mechanical Engineering, 2022, 58(15): 198-207.

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