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.

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]

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.

Research of the kinetics of thickness of the boundary layers of lubricating materials applied to drilling technology

2021 ◽  
pp. 115-120
Author(s):  
R.A. Ismakov ◽  
◽  
V.G. Konesev ◽  
F.N. Yangirov ◽  
G.L. Gaymaletdinova ◽  
...  
Keyword(s):  
Service Life ◽  
Boundary Layers ◽  
Friction Pair ◽  
Roller Bearing ◽  
Equipment Safety ◽  
Efficiency And Effectiveness ◽  
Drilling Technology ◽  
Resource Characteristics ◽  
Friction Surfaces ◽  
Kinetics Of

Improving the operational properties of lubricants increases the service life of the mechanisms and increase the durability of rubbing joints, which has a positive effect on the indicators of technical and economic efficiency and equipment safety. Therefore, great attention in tribology is paid to the analysis of the state of friction units in technology and the assessment of their resource characteristics, which makes it possible to increase their service life. The research aim is to study the general provisions on lubricants and lubricants, as well as the features of the boundary layers formation on friction surfaces and the observed patterns. Calculations of the boundary layers thickness using lubricating reagents at different energetic loading of the friction pair were carried out as applied to the roller bearing of a roller cone bit in the medium of cylinder oil 52 and DPS grease. The proposed research methodology made it possible to in-crease the efficiency and effectiveness of the means development for improving the tribotech-nical properties of drilling lubricants.

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.

Assessment of Physical, Chemical, and Tribological Properties of Different Biodiesel Fuels

2017 ◽  
pp. 441-463 ◽  
Author(s):  
M. Mofijur ◽  
M.G. Rasul ◽  
N.M.S. Hassan ◽  
H.H. Masjuki ◽  
M.A. Kalam ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Physical Chemical ◽  
Biodiesel Fuels

scholarly journals Technology to Increase Hydrocarbon Wear Resistance of Friction Units of Hydrogen Aggregates

2019 ◽  
Vol 297 ◽  
pp. 09001 ◽  
Author(s):  
Mikhail Shalygin ◽  
Sergei Kuznetsov
Keyword(s):  
Wear Resistance ◽  
Steel Surface ◽  
Friction Pair ◽  
Dehydration Process ◽  
Diffusion Capacity ◽  
Friction Units ◽  
Surface Irregularities ◽  
Friction Surfaces ◽  
Technological Methods ◽  
Wear Tests

The causes of hydrogen wear of the friction surfaces involved in hydrocarbon transfer and distillation processes are considered. Some technological methods for reducing the hydrogen wear of parts and friction units operating in hydrocarbon environment are given. A comprehensive technology for obtaining the properties of the surface layer is proposed, which provides an increase in the wear resistance of a friction pair and smoothing the surface roughness. The increase in wear resistance is based on several mechanisms: (1) decreasing biographical hydrogen due to the dehydration process; (2) smoothing surface irregularities by saturating the surface with silicon; (3) reducing the diffusion capacity of the steel surface caused by diffusion siliconizing; (4) reducing grain size of the material. Comparative wear tests were carried out, which showed the effectiveness of the proposed methods.

scholarly journals Coordinating influence of multilayer graphene and spherical SnAgCu for improving tribological properties of a 20CrMnTi material

RSC Advances ◽  
2018 ◽  
Vol 8 (25) ◽  
pp. 14129-14137 ◽  
Author(s):  
Xiaoxue Li ◽  
Jingli Xu
Keyword(s):  
Service Life ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Operational Reliability ◽  
Multilayer Graphene ◽  
Friction And Wear Behavior

In order to increase the service life and operational reliability of a 20CrMnTi-steel-based gearing system, the friction and wear behavior of 20CrMnTi needs to be further improved.

ANALYSIS OF TRIBOLOGICAL PROPERTIES OF SELECTED PTFE-BASED POLYMER COMPOSITES IN A SLIDING INTERACTION WITH ALUMINIUM OXIDE (Al2O3)

Tribologia ◽  
2018 ◽  
Vol 280 (4) ◽  
pp. 107-112 ◽  
Author(s):  
Władysław SKONECZNY ◽  
Sławomir KAPTACZ ◽  
Adrian BARYLSKI ◽  
Tomasz KMITA
Keyword(s):  
Mechanical Properties ◽  
Service Life ◽  
Polymer Composites ◽  
Tribological Properties ◽  
Mechanical Parameters ◽  
Reciprocating Motion ◽  
Graphite Content ◽  
Mechanical And Tribological Properties ◽  
Ptfe Composite ◽  
Bronze Powder

The paper presents the microstructure and mechanical and tribological properties of polymer composites based on polytetrafluoroethylene (PTFE) intended for use in friction couples where reciprocating motion is performed, e.g., in compressors or actuators. Micromechanical tests carried out using the Oliver-Pharr method showed that the PTFE composite with a 40% bronze content (T8B) had the most advantageous mechanical properties (hardness H, Young’s modulus E). In turn, tribological tests that were conducted using a ballon- disc tester in the linear (reciprocating) motion showed that the polytetrafluoroethylene composite with a mixture of 25% bronze powder and 15% graphite (T4GM) had the lowest tribological wear. The tribological properties of composite T5W with 25% graphite content were not much worse. Despite the most favourable mechanical parameters, the tribological wear of composites T8B and PTFE with glassy carbon (T3Ws) was nearly twice higher due to the absence of grease formed by a graphite filling. The results show that the use of composites containing a bronze-graphite filling improves the service life of lubricant-free friction couples that perform reciprocating motion.

TRIBOLOGICAL PROPERTIES OF TiO2/SiO2 DOUBLE LAYER COATINGS DEPOSITED ON CP-Ti

2016 ◽  
Vol 24 (06) ◽  
pp. 1750082 ◽  
Author(s):  
O. ÇOMAKLI ◽  
M. YAZICI ◽  
T. YETIM ◽  
A. F. YETIM ◽  
A. ÇELIK
Keyword(s):  
Double Layer ◽  
Tribological Properties ◽  
Phase Structure ◽  
Sol Gel ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Cross Sectional ◽  
Adhesion Properties ◽  
Wear Rates ◽  
Cp Ti

In the present paper, the influences of different double layer on wear and scratch performances of commercially pure Titanium (CP-Ti) were investigated. TiO2/SiO2 and SiO2/TiO2 double layer coatings were deposited on CP-Ti by sol–gel dip coating process and calcined at 750[Formula: see text]C. The phase structure, cross-sectional morphology, composition, wear track morphologies, adhesion properties, hardness and roughness of uncoated and coated samples were characterized with X-ray diffraction, scanning electron microscopy (SEM), nano-indentation technique, scratch tester and 3D profilometer. Also, the tribological performances of all samples were investigated by a pin-on-disc tribo-tester against Al2O3 ball. Results showed that hardness, elastic modulus and adhesion resistance of double layer coated samples were higher than untreated CP-Ti. It was found that these properties of TiO2/SiO2 double layer coatings have higher than SiO2/TiO2 double layer coating. Additionally, the lowest friction coefficient and wear rates were obtained from TiO2/SiO2 double layer coatings. Therefore, it was seen that phase structure, hardness and film adhesion are important factors on the tribological properties of double layer coatings.

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