Increasing the life of the center plate-center bowl friction unit of a freight car by applying a combined coating formed by electrospark alloying

2021 ◽  
pp. 70-73
Author(s):  
Keyword(s):  
Operational Reliability ◽  
Friction Unit ◽  
Electrospark Alloying ◽  
Railway Transport ◽  
Antifriction Coating ◽  
Friction Units ◽  
Freight Car ◽  
Combined Coatings ◽  
Plate Center

An increase in the operational reliability of friction units of railway transport by applying antifriction combined coatings formed by electrospark alloying, which ensures their greater strength and adhesion to metal, is considered. Keywords: electrospark alloying combined antifriction coating, strength, adhesion. [email protected]

scholarly journals Improvement of the tribological properties of heavy-loaded friction units “Centre block-footstep bearing” of a freight car

2021 ◽  
Vol 2131 (5) ◽  
pp. 052033
Author(s):  
A Sychev ◽  
V Avilov ◽  
M Savenkova ◽  
E Luneva ◽  
A Sychev
Keyword(s):  
Service Life ◽  
Tribological Properties ◽  
Friction Unit ◽  
Inorganic Polymers ◽  
Adhesion Properties ◽  
Friction Units ◽  
Physical Chemical ◽  
Operational Tests ◽  
Freight Car ◽  
Friction Surfaces

Abstract Various problems and different approaches of solution of such a problematic unit as “centre block-footstep bearing” of freight cars are discussed in the paper. The methods of improving the tribological properties of this friction unit by means of material modification of friction surfaces and perfection of physical, chemical and tribological properties of the used lubricants were studied. Grease lubricants common for friction units of railway machinery were used after being modified with inorganic polymers based on double metaphosphates. Bench and operational tests of the developed additive of the polymeric double metaphosphates were carried out. This additive reduces wear and increases the service life of the friction unit, due to the better adhesion properties of this additive. The variants with a change in the geometry of the contact surface of the disk between the bolster and the “centre block-footstep bearing” arrangement of the car are considered. Simulation of the parameters of movement in curved sections is proposed.

Influence of sliding bearing design on efficiency of the fluoroplast macromodifier for antifriction carbon plastics

2021 ◽  
pp. 65-75
Author(s):  
I. V. Lishevich ◽  
A. V. Anisimov ◽  
G. I. Nikolaev ◽  
A. S. Savelov ◽  
A. S. Sargsyan
Keyword(s):  
Sliding Friction ◽  
Friction Unit ◽  
Sliding Bearings ◽  
Friction Zone ◽  
Reinforced Plastics ◽  
Friction Units ◽  
Carbon Plastics ◽  
Key Factor ◽  
Fiber Reinforced Plastics ◽  
Bearing Design

The paper presents the results of laboratory and bench tests of UGET and FUT antifriction carbon plastics macro modified with PTFE. The efficiency (friction coefficient reduction) of this modification of carbon fiber reinforced plastics has been confirmed. The dependence of the method’s efficiency on the design of sliding friction units has been established. The plastic deformation of the fluoroplastic is the key factor that determines the effectiveness of the modifier when designing sliding bearings. The design of the friction unit should exclude the pressure gradient in the fluoroplastic protectors and prevent the possibility of an uncontrolled exit of the fluoroplastic from the friction zone.

scholarly journals SIMPLIFIED APPROACH OF DETERMINATION OF THE MEASURE TO INCREASE THE EFFICIENCY OF RAILWAY TRANSPORT OF THE METALLURGICAL PLANT

2021 ◽  
pp. 43-54
Author(s):  
Elena Kiritseva ◽  
Olha Kletska ◽  
Andrey Lyamzin ◽  
Anatoliy Falendysh
Keyword(s):  
Metallurgical Plant ◽  
Rolling Stock ◽  
Railway Transport ◽  
Metallurgical Enterprise ◽  
Simplified Approach ◽  
Scarce Resources ◽  
Industrial Enterprises ◽  
Stage Of Development ◽  
Standard Set ◽  
Freight Car

The article proposes the approach for determining the measure to increase the efficiency of railway transport of the metallurgical plant. The analysis of scientific and normative works on the efficiency of railway transport at industrial enterprises showed that this issue is not fully covered and requires more detailed study. The work of the railway shop of the metallurgical enterprise is considered, namely, the turnover off right cars of different owners and the time of their stay on the factory tracks are determined. An analysis of statistical data was made, which showed that the time difference between the standard set at the enterprise and the actual time of stay of the freight car at the planthas a large discrepancy. This requires spending additional funds for the use of cars of different owners. For this purpose, a model for determining measures to minimize costs at the metallurgical enterprise was developed. The algorithm for its solution involves five stages of calculations. It is based on the model of managements science, which is presented as the approach of linear programming to determine the optimal means of allocating scarce resources in the presence of competing needs. Calculations were made, thanks to which the first stage of development of the model for determining the measure to improve the performance of railway transport was performed and the indicators that characterize it were determined. The total time of rolling stock at the enterprise is determined. Based on this, it is established that it is necessary to separate from the total time the time spent at each station according to the operations performed with the cars. Costs are determined operationally due to the received analysis of the stay and turnover of the freight car at the metallurgical enterprise. Installed stations, which are the most time-consuming freight cars, is there is an excess of payment for the down time of cars at these stations. Based on this, it was decided that it is necessary to study in more detail the operations performed with cars at theses stations and to identify "weaknesses" in the turnover of the freight car at the metallurgical enterprise. 

COMPARATIVE ANALYSIS OF METHODS FOR STUDYING THE ADHESION OF ANTIFRICTION COATINGS FOR FRICTION UNITS OF AUTOMOTIVE TECHNOLOGY AND TECHNOLOGICAL MACHINES

2021 ◽  
Vol 75 (4) ◽  
pp. 43-48
Author(s):  
Tokmakova Maria Andreevna ◽  
◽  
Novikov Alexander Nikolaevich ◽  
Rodichev Aleksey Yurievich ◽  
◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Adhesion Strength ◽  
Adhesive Strength ◽  
Antifriction Coating ◽  
Automotive Technology ◽  
Friction Units ◽  
Quantitative Estimates ◽  
Antifriction Coatings ◽  
Strength Of Adhesion

The article presents a study of the adhesive strength of adhesion of thin solid antifriction coatings. A brief analysis of existing methods for determining the adhesive strength of thin anti-friction coatings is performed. The method is described and experiments are carried out using a universal-purpose breaking machine with an electronic force meter IR5047-50 and a portable ad-hesive meter of the «Constant A» model. A number of quantitative estimates of the adhesion strength of the antifriction coating with the base are obtained. Conclusions are made about the adhesion strength of the coating and methods for determining its adhesion. Recommendations on the application of methods for determining the adhesive strength of thin solid antifriction coatings are given.

Inverse wear contact problem of the friction unit

2017 ◽  
Vol 232 (22) ◽  
pp. 4216-4226 ◽  
Author(s):  
Vagif M Mirsalimov ◽  
Parvana E Akhundova
Keyword(s):  
Friction Surface ◽  
Mechanical Characteristics ◽  
Friction Pair ◽  
Friction Unit ◽  
Surface Model ◽  
Algebraic Equations ◽  
External Contour ◽  
Friction Units ◽  
Sucker Rod ◽  
Wear Contact Problem

In this study, theoretical analysis for defining the function of displacements of a hub’s external contour points and microgeometry of the friction unit providing the absence of initial wear that holds to the end of running-in period, was carried out based on a rough friction surface model. A closed system of algebraic equations admitting to obtain the solution of the problem of optimal design of a friction unit depending on the geometrical and mechanical characteristics of a hub and plunger was constructed. The found function of displacements of the hub’s external contour points and microgeometry of friction surface provide wear resistance increase of friction pair. Calculations for friction units applied to the borehole sucker–rod oil pumps were considered as an example.

scholarly journals Application of Alloyed Cast Iron to Increase the Durability of Products of the Mining and Metallurgical Industry

2020 ◽  
Vol 174 ◽  
pp. 03022
Author(s):  
Dmitry Lubyanoi ◽  
Evgeny Pudov ◽  
Evgeny Kuzin ◽  
Olga Semenova ◽  
Radim Rybár
Keyword(s):  
Cast Iron ◽  
Performance Indicators ◽  
Gray Cast Iron ◽  
Metallurgical Industry ◽  
Operational Reliability ◽  
Strength Properties ◽  
Friction Units ◽  
Alloyed Cast ◽  
Alloyed Cast Iron ◽  
Working Bodies

The article shows the relevance of the use of alloyed cast iron in mining and metallurgical engineering. The use of cast iron alloyed with titanium and vanadium has not been sufficiently studied for the working bodies and friction units of mining machines, such as pumps, coal scoops, hydrocyclones, crushers and mills. They have the main abrasive type of wear. This work considers the influence of titanium and vanadium on the mechanical properties. The performance indicators of parts of mining machines and metallurgical products in contact with high-abrasive and high-temperature environments is also considered. The optimal content of titanium and vanadium in gray cast iron in the range of 0.05-0.1% is set. This provides the required strength properties of the components, while increasing their heat resistance. Bushings made of this cast iron have the required wear resistance and can improve the operational reliability of equipment in mining and metallurgical industries.

scholarly journals Scientific Substantiation of Thermal Leveling for Deformations in the Car Structure

2018 ◽  
Vol 7 (4.3) ◽  
pp. 125 ◽  
Author(s):  
Oleksiy Fomin ◽  
Oleksandr Logvinenko ◽  
Oleksiy Burlutsky ◽  
Andriy Rybin
Keyword(s):  
Rolling Stock ◽  
Railway Transport ◽  
Significant Deterioration ◽  
Rail Industry ◽  
Scientific Substantiation ◽  
Freight Car ◽  
The One ◽  
Welding Procedure ◽  
Transport Complex

Railway transport is the foundation of the transport complex and part of the transport network of logistics chains. However, significant deterioration of rolling stock units (especially freight cars accounting for the greater part of all transportation) is an urgent problem of the rail industry. Therefore, the problems of renovation of the existing freight car fleet by developing and introducing domestic models which can effectively compete in terms of the technical and economic and operational indexes are of crucial importance. But the car structure suffers from various deformations at all service stages (production, maintenance and operation). The main type of these deformations is residual ones developing during the welding procedure, due to the thermal effect. Therefore, the issues concerning elimination of these deformations in production and maintenance are becoming ever more urgent. In particular, the most recognized and economy-oriented approach in the field is the one based on the thermal leveling of welded structures. The implementation of this approach requires some research aimed at scientific substantiation of the thermal leveling, as well as, specification of forms and heating temperatures, determination of heating form sizes, thermal leveling simulation and experimental verification of the results, optical microscopy and determination of mechanical characteristics.  

scholarly journals Methodology for constructing digital twins in railway transport

2021 ◽  
Vol 80 (2) ◽  
pp. 91-99
Author(s):  
D. V. Shevchenko
Keyword(s):  
Life Cycle ◽  
Industrial Revolution ◽  
Physical Object ◽  
Virtual Space ◽  
Railway Transport ◽  
Digital Twin ◽  
Fourth Industrial Revolution ◽  
Digital Twins ◽  
Virtual Operation ◽  
Freight Car

Fourth industrial revolution covers all areas of human economic activity, including areas related to the design and operation of various products (nuclear power plant building, freight car, MEMS devices, etc.) throughout their entire life cycle. One of the main tools for digital transformation of industry to meet new competitive requirements is the Digital Twin, which is always built for a specific physical object. The introduction of digital twins technology into the life cycle of a freight car will increase economic efficiency throughout its life cycle.Effective use of the digital twin technology is possible only when an adequate virtual model of the space surrounding this physical object is created. In this regard, predicting the behavior of a structure during motion on the basis of a high-precision model of a digital twin of a physical object requires the creation of a virtual space in which a virtual operation area will be implemented, which provides the possibility of mathematical modeling of motion. To do this, it is necessary to create virtual stands and operation areas, where it will be possible to carry out numerical tests. Creation of a high-quality virtual space will drastically reduce the number of field tests carried out, and study the effect of a larger number of parameters on the performance characteristics of a physical object.Creation and use of digital twins is consistent with the goals, objectives and action plan of the Strategy for the development of transport engineering in the Russian Federation for the period up to 2030. The introduction of digital twins in railway transport, in particular in freight rolling stock, will make it possible to correctly assign the service life, overhaul times, and increase operational efficiency, collect information about the real load, etc. To maintain competitive advantages over other modes of transport, the transport industry needs to develop towards the introduction of elements of the fourth industrial revolution, including digital twins.

Fundamentals of technology to improve the performance of friction units of transport equipment

2020 ◽  
pp. 547-551
Author(s):  
I.A. Medeljaev
Keyword(s):  
Lubricant Film ◽  
Friction Unit ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Transport Equipment ◽  
Friction Heat ◽  
Friction Units ◽  
Start Up ◽  
Starting Conditions ◽  
Friction Surfaces

The article deals with the basics of technology for improving the performance of friction units of machines and their diagnostics by acoustic emission method. It is shown that it is important to create a lubricant film on the friction surfaces before they are mechanically loaded, which ensures "soft" starting conditions during their start-up. After the creation of the lubricant film, the friction unit is mechanically loaded with the regulation of friction heat generation, which, together with the filtration of the lubricant and timely cleaning of the filter elements from pollutants, lengthens the life of the lubricant film and increases the service life of the friction unit.

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