Correlations between rail wear rates and operating conditions in a commercial railroad

Proceedings of the Institution of Mechanical Engineers, Part J:

Zhou

et al. 2018

The objective of this study is to explore the influence of grinding stone granularity on the grinding force and rail material removal behaviors using a rail grinding friction machine. The results indicate that with the increase in granularity, the grinding force, and friction coefficient in the grinding interface obviously increase, which brings about a rise in the hardness and grinding temperature-rise of rail specimens. The increase in the grinding stone granularity causes a fall in the grinding volume and surface roughness of rail materials and brings about stronger vibration in the grinding interface owing to different material removal mechanisms. In view of the experimental results, the optimization of grinding stone granularity is significant for improving the rail grinding efficiency and surface quality.

Section: Introductionmentioning

confidence: 99%

Influence of granularity of grinding stone on grinding force and material removal in the rail grinding process

Proceedings of the Institution of Mechanical Engineers, Part J:

Zhou

et al. 2018

“…The rail grinding technologies have always been extensively explored. Various grinding technologies, including the face grinding with abrasive wheel, 6–11 the peripheral grinding with abrasive wheel, 12,13 the milling with combined cutter blades 14 and the high-speed grinding with unpowered abrasive wheel, 15 have been applied in different railway circumstances. Furthermore, the new rail grinding method using abrasive belt 16 has also been proposed and has showed the convincing merits, including the higher material removal rate and the better surface quality.…”

Section: Introductionmentioning

confidence: 99%

Microscopic contact pressure and material removal modeling in rail grinding using abrasive belt

Fan

Proceedings of the Institution of Mechanical Engineers, Part B:

et al. 2020

Recently, the emerging rail grinding method using abrasive belt has been proposed to efficiently achieve the required geometric profile and the surface quality of the railhead. Although the abrasive features indeed have a great influence on this rail grinding process, the surface topography of abrasive belt regarding grits at the microscopic scale is neglected. In this article, a microscopic contact pressure model was developed to reveal the contact behavior of every active grit based on the digital representation of the surface topography of abrasive belt. Then a numerical model of material removal quantity was also established based on the consideration of the characteristics of abrasive grits and their interactions. Finally, the series of finite element simulations and grinding tests were successively implemented. The normal load and the surface topography of abrasive belt significantly affected the microscopic contact behavior of grits, thus confirming the proposed theoretical models of microscopic contact pressure and material removal quantity.

“…To date, several kinds of rail-grinding technologies have been applied in the practical engineering, such as the facing grinding by abrasive wheel [5][6][7][8], the peripheral grinding by abrasive wheel [9,10], and the milling by combined cutter blades [11]. Each technology has its own limitation and application field due to its characteristics.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of a Novel Rail‐Grinding Car Using Open‐Structured Abrasive Belt for High‐Speed Railways

Fan

Hou

Mathematical Problems in Engineering

et al. 2019

Nowadays, applying rail grinding has been worldwide recognized as the routine maintenance approach to improving the wheel-rail relationship, as well as extending the rail’s serving life. However, the traditional rail repair technology with the abrasive wheel or the milling cutter is getting harder to meet the increasing demand for high efficiency with high speed. In this paper, according to the engineering requirements and constraints, a new fast rail-grinding car based on open-structured belt grinding technology was designed for the corrugation treatment on high-speed railways. A corresponding simulation model was established and its dynamic working performance was then assessed by SIMPACK software. Results of the four dynamic indices for both straight and curve tracks were within the limits, which had verified the design rationality of the new rail-grinding car. Those dynamic indices are the lateral vibration acceleration, the vertical vibration acceleration, the axle transverse force, and the derailment coefficient.