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In article the question about possibility of extension of service life of carriage wheels by influence on technological parameters of restoration of their driving profile is considered. The correlation analysis of statistical data on volumes of machining and the size of defects on a driving surface of the wheels coming to repair is made. The mechanism of purpose of an allowance for machining of a driving profile of a wheel which will allow to reduce an unreasonable consumption of metal of a rim of a wheel in shaving is offered.

The article is devoted to the description of the requirements for the accuracy of control devices and the development of methods to ensure the claimed dimensional accuracy by methods of dimensional analysis. The conditions for ensuring the accuracy of the assembly scheme, the determination of the dimensional chain and dimensional analysis of the dimensional chain during the assembly of the control device, as well as the main causes of errors during assembly and ways to eliminate them are listed. In addition, the consequences of the influence of irregular gaps in the interfaces of the control device parts on the measurement accuracy are presented, various types of assembly dimensional chains are considered, tasks solved when calculating the dimensional chain. The paper presents a compiled dimensional chain of the technological process of assembling a measuring instrument for monitoring the alignment of the inserts of motor-axial bearings of traction electric motors of locomotives, which represents a dimensional chain of the first type and is a chain with linear dimensions and vertically parallel links. The purpose of the work is to substantiate the calculated tolerances and limit deviations of the links of the assembly dimensional chain, providing the required value of the closing link for the proper functioning of the assembled measuring instrument. The paper describes the selection of the closing link of the dimensional chain, the selection of the links that make up the dimensional chain, the calculation of the limiting deviations of the closing link that ensure the required measurement accuracy during operation of the control device and the calculation of the limiting deviations of the components of the links of the dimensional chain by the "maximum-minimum" method. Thus, the article presents a solution to the design problem of dimensional analysis, which consists in determining the accuracy of the component links of the dimensional chain when assembling the control device according to the known calculated tolerance of the closing link and its limit deviations.

The models of complex organizational and technological parameters of operation of liner-straightening machines cyclic action on the example of the VPR-02 and VPRS-02 using a probabilistic assessment of the reliability of their work. For her study conducted two etapa checks: logical and mathematical. After sampling in accordance with GOST 8.207-76 inspect it belongs-rise normal distribution using Pearson's chi-squared test. Next calculated reliability and risk completion of the planned scope of work machine systems, complexes, components and individual machines in the planned period of time. The models are based on actual field tests of databases, technical and economic indicators of machines, components and systems in real operating conditions. This model optimizes track works with a given reliability at stave-builder, all kinds of repair and current maintenance of railway track. And also give the opportunity to the WHO-define more rational modes of operation of track machines for you, edits, tamping and straightening the railway line, thereby increasing pa O-workings of these machines. They enable organizations operating these machines more reasonably expect the required number of cars processes track works, their cost and labor. The proposed method models quantify the technical reliability of the liner-straightening machines; allow predicting the main complex organizational and technological performance of a particular machine at the design stage of technological processes track works. This method is versatile and can be used to evaluate the technical reliability of any machine systems, components and separate machines.

The paper considers the use of simulation modeling in the reengineering of technological processes for repairing rolling stock units on the example of repairing a bogie model 18-578 of an open-top car. The most time-consuming sub-process of repairing the bolster of this bogie was considered as the object of reengineering. Three options for reengineering of this subprocess were considered, implying a complete replacement of the technological equipment currently in use at repair operations (positions) with more efficient positions of the subprocess. To substantiate the choice of the most preferable reengineering option, the values of such indicators of the functioning of the subprocess under consideration as its productivity per shift (throughput), the load factor of the resources used at the repair positions, the volume of work in progress at the end of the shift, the number of workers employed in production and the costs associated with the possible purchase of new technological equipment. Simulation modeling of the functioning of the considered sub-process of bogie bolster repair was carried out on the basis of the methods of the queuing theory. The construction of simulation models and their assessment of the above indicators were carried out in the Arena RockWell Software environment. When developing simulation models for each of the possible options for reengineering a subprocess, the discipline of its organization and maintenance was taken into account. In the article, for each of the reengineering options, the calculated quantitative estimates of the listed indicators are presented, obtained using the corresponding developed simulation models. The use of these assessments reduces the risks in the development and subsequent implementation of organizational and technical solutions associated with the modernization of the considered technological sub-process of repair of the bolster of a gondola car bogie.