The article notes that the main share of the costs for maintaining a fleet of freight cars falls on their current, depot and overhaul repairs. The cost of car repairing is significantly affected by the increase in prices for wheels, new and overhauled wheelsets. The paper explores ways to reduce these costs by increasing the life cycle of the wheelset and extending its service life. The proposals of a number of authors are analyzed to increase the hardness on the surface of the rolling wheel, to reduce the wear of the wheel crest, to make changes to the repair documentation, to introduce new IT services into the car repair production. Issues of the use of blockchain technology for management of the life cycle of wheelsets are considered. Proposals are given for participation of the university scientific community in solving the identified problematic issues.
The existing theoretical models of heating by concentrated sources with a high energy density generally describe processes with deep penetration welding of part surfaces. The purpose of this study is to identify the factors that have a major effect on hardening of parts through heat treatment with a high-speed or pulsed scanning stationary heat source, which creates a uniform temperature field. Using methods of regression analysis, the authors derived equations for calculating the hardening depth in the proposed hardening process, the rate and time of steel cooling in a critical temperature range. The paper presents the calculated parameters of the hardening process in which parts, including wheel flanges of locomotives, are heated by a plasma arc in nitrogen. The findings can be used to reduce costs of complex experiments aimed at selecting surface heat hardening parameters to increase the service life of locomotive mechanical parts.
The model of service maintenance and repair of passenger rolling stock is considered as a multi-channel system. The presented model is implemented on the queuing model basis. The service maintenance and passenger rolling stock system stipulates not only for the transition to a new level of the maintenance system as a type of activity but as a means boosting up the economic growth rate and living standards. As a result, we managed to resolve the problem of the optimum design for the service maintenance and repair model.
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