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Study on cutting form and surface machining quality of refitted wheel tread

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Document pages: 12 pages

Abstract: Wheel set maintenance cost is an important part of train maintenance cost. Researchers and railway operators have been paying great attention to how to minimize the residual stress and surface roughness of wheel tread during wheel reassembly, so as to reduce the damage of wheel during operation, prolong the service life of wheel set and reduce the maintenance cost of wheel set. In this study, the wheel steel is taken as the research object. By establishing the finite element model of wheel repair, the dynamic simulation of wheel repair process is carried out. The surface roughness and residual stress distribution of wheel tread under different milling parameters are comprehensively analyzed. The simulation results show that the increase of cutting speed and post cutting depth will lead to the increase of cutting speedchip morphology to change while impairing the machined surface quality. Once serrated chip occurs, it means wheel tread machining quality deteriorates remarkably. In this way, the paper associates macroscopic chip morphology with microcosmic surface roughness and internal residual stress to provide theoretical basis for optimization of wheel reprofiling process.

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