scholarly journals INSTALLATION AND ME TION AND METHODOLOGY FOR DE OGY FOR DETERMINING OF TERMINING OF ANTIFRICTIONAL PROPER AL PROPERTIES OF AN TIES OF ANTISTATIC-HEA TIC-HEATCONDUCTING COMPOSI TING COMPOSITE POLYMERIC M YMERIC MATERIALS INTERACTING WI TING WITH FIBROUS M TH FIBROUS MASS (CO ASS (COTTON-RAW)

2018 ◽  
Vol 2 ◽  
pp. 20-23
Author(s):  
S Negmatov ◽  
◽  
N Abed ◽  
G Gulyamov ◽  
Q Eshkabilov
Keyword(s):  
Flat Surface ◽  
Rotating Disk ◽  
Machine Building ◽  
Polymer Materials ◽  
Heat Conducting ◽  
Friction Forces ◽  
Friction Zone ◽  
Electrostatic Charges ◽  
Antifriction Properties ◽  
Disk Sample

The paper Presents a disk tribometer installation and allows to determine the antifriction properties of machine-building composite antistatic-heat-conducting polymer materials working in interaction with the fibrous mass (raw cotton). A method for determining the friction force, temperature and electrostatic charge values arising in the friction zone is developed. The friction of the fibrous material is carried out on the flat surface of the rotating disk sample from the material under study at specified clamping pressures and sliding speeds. Values of friction forces, temperatures and values of electrostatic charges of the tested sample in a zone of friction with cotton-raw are measured by means of sensors.

scholarly journals Research of physically modified antifriction-wear-resistant composite polymer materials and coatings on their basis for machine-building purpose

2021 ◽  
pp. 28-32
Author(s):  
S. S. Negmatov ◽  
N. S. Abed ◽  
K. S. Negmatova ◽  
T. S. Halimjonov ◽  
M. M. Sadikova ◽  
...  
Keyword(s):  
Polymeric Materials ◽  
Epoxy Compound ◽  
Machine Building ◽  
Polymer Materials ◽  
Friction Zone ◽  
Tribotechnical Properties ◽  
Organic Mineral ◽  
Building Purpose ◽  
Mineral Fillers ◽  
Thermosetting Epoxy

The article presents the results of studies of the tribotechnical properties of composite thermosetting polymeric materials based on an epoxy compound and ultrasonicated oligomeric fillers operating under conditions of contact interaction with a pulp using the example of raw cotton. Regularities of changes in tribotechnical properties (coefficient of friction, intensity of wear) of composite thermosetting epoxy polymeric materials associated with their filling with organomineral fillers and ultrasonic treatment, in contact with raw cotton have been revealed. The temperature and the magnitude of the electrostatic charge arising in the friction zone of rubbing polymer- cotton and composite-cotton pairs on the type and content of organic-mineral fillers were studied.

scholarly journals Assessment of quality of products from polymer materials for machine-building purposes

2020 ◽  
Vol 1614 ◽  
pp. 012044
Author(s):  
D Gramakov ◽  
A Larchenko ◽  
N Filippenko ◽  
A Livshits ◽  
D Bakanin ◽  
...  
Keyword(s):  
Machine Building ◽  
Polymer Materials ◽  
Quality Of Products

scholarly journals Analysis of Tribotechnical Properties and Comparative Evaluation of Polymeric Materials and Rubbers Used in Rolling Stock

2021 ◽  
Vol 19 (3) ◽  
pp. 16-24
Author(s):  
M. Yu. Kulikov ◽  
V. P. Biryukov ◽  
A. N. Prints
Keyword(s):  
Polymeric Materials ◽  
Polymer Materials ◽  
Rolling Stock ◽  
Butadiene Rubber ◽  
Friction Coefficients ◽  
Ongoing Research ◽  
Friction Zone ◽  
Tribological Tests ◽  
Friction Assemblies ◽  
Fixed Abrasive

Rubber materials are widely used in friction assemblies of railway rolling stock. Rubbers are used oil seals, other various seals, shock absorbers, corrugated hoses, sleeves, sealing rings, etc. During operation, rubbers are exposed to various mechanical influences that cause wear, cracks, abrasion, dents, burnthroughs, etc., which can lead to the failure of the entire unit and unforeseen unscheduled repairs of the rolling stock. Any failure on the route together with unplanned repairs incur heavy economic losses.Currently, the issue of wear of rubbers in rubber-steel tribopairs has not been sufficiently studied in case of supply of lubricant to the friction zone and of wear caused by a free and fixed abrasive. There is ongoing research on the possibility of replacing rubber products with other polymeric materials, which have shown significantly better results in tribological tests, both in terms of friction coefficients and in the wear mechanism. The data obtained will make it possible to choose the most optimal options for materials that can act as a replacement for standard rubber products in rolling stock friction assemblies.The paper presents the results of tribological tests of thermoplastic polyurethanes (TPU), ultra-high-molecular-weight polyethylene (UHMWPE) and polypropylene (PP2015) in comparison with rubber based on nitrile butadiene rubber (NBR). The tests were carried out according to two schemes: «plane (tested sample) – bushing» and «plane (tested sample) – generatrix of a rubber disk with supply of abrasive grain to the friction zone». The objective of the work is to determine the dependence of the change in friction coefficients on load and sliding speed, as well as the dependence of seizure pressures of tribo-pairs on speed, weight loss of samples after wear tests with a free and fixed abrasive, the morphology of wear surfaces, and wear mechanisms of polymer materials and rubbers.

scholarly journals Adhesion-strength and tribotechnical properties of machine-building composite polymer coatings

2021 ◽  
Vol 264 ◽  
pp. 05032
Author(s):  
Soyibjon Negmatov ◽  
T Ulmasov ◽  
M Karshiyev ◽  
Z Makhammadjonov ◽  
O Abdulayev ◽  
...  
Keyword(s):  
Adhesion Strength ◽  
Adhesive Strength ◽  
Polymer Coatings ◽  
Machine Building ◽  
Polymer Materials ◽  
Tribotechnical Properties ◽  
Extreme Character ◽  
Relative Change ◽  
Temperature Time ◽  
Degree Of Filling

The article presents the results of studies of adhesive, strength and tribotechnical properties of composite polycaproamide polymer materials and coatings based on them for mechanical engineering purposes. It has been established that the relative change in the adhesion strength depends on the degree of filling in air and in argon has an extreme character passing through a maximum for coatings based on PCA with aluminum oxide, and for coatings made of PCA with copper oxide, it has a complex character. The formation of adhesive, strength, and tribotechnical properties of filled polycaproamide coatings was also studied. At the same time, it was found that by adjusting the temperature-time technological modes, it is possible to increase the adhesive, strength, and tribotechnical characteristics of composite polycaproamide coatings for machine-building purposes.

A Rotating-Disk Sample Holder for the Sparking of Flat-Metal-Disk Samples

1971 ◽  
Vol 25 (6) ◽  
pp. 678-680 ◽  
Author(s):  
P. E. Walters ◽  
T. Monaci
Keyword(s):  
Rotating Disk ◽  
Sample Holder ◽  
Metal Disk ◽  
Disk Sample

Rotating-Disk-Sample Electrode Method

1963 ◽  
Vol 17 (3) ◽  
pp. 76-77 ◽  
Author(s):  
M. S. Wang
Keyword(s):  
Rotating Disk ◽  
Electrode Method ◽  
Disk Sample

Wear Resistance of Aluminized Steel Plates

2011 ◽  
Vol 56 (4) ◽  
pp. 871-882 ◽  
Author(s):  
K. Żaba
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Abrasion Resistance ◽  
Rotating Disk ◽  
Steel Plates ◽  
Steel Strips ◽  
Aluminized Steel ◽  
Before And After ◽  
Coating Mass ◽  
Disk Sample

Wear Resistance of Aluminized Steel Plates The results of the abrasion resistance measurements of aluminized steel strips are presented in the hereby paper. Steel strips of DX52D+AS120 grade, before and after a heat treatment at temperatures of 200-1000°C for 1 - 5760 minutes, were tested. Tests of the abrasion resistance were carried on in a specially built device: rotating disk - sample performing a plane-rotary motion, with an application of a lubricating medium. Examinations of the abrasion resistance were also performed by means of the block-on-ring tester. Estimations of a coating mass loss, roughness and thickness changes were carried on. The obtained results are illustrated by diagrams and macro- and micro-observations. Phase analysis investigations were also performed on samples selected after the abrasibility testing. The range of the heat treatment parameters - after which the Al-Si coating increased its abrasion resistance - was estimated.

scholarly journals Designing an outer toothed gear whose wheel teeth are outlined by the logarithmic spiral arcs

2021 ◽  
Vol 6 (7 (114)) ◽  
Author(s):  
Serhii Pylypaka ◽  
Tetiana Kresan ◽  
Tatiana Volina ◽  
Iryna Hryshchenko ◽  
Liubov Pshenychna ◽  
...  
Keyword(s):  
High Reliability ◽  
Gear Tooth ◽  
Logarithmic Spiral ◽  
Acute Angle ◽  
Machine Building ◽  
Radius Vector ◽  
Transfer Number ◽  
Friction Forces ◽  
Number Of Teeth ◽  
Coordinate Origin

Toothed gears are the most common mechanical gears in machine building, which are characterized by high reliability and durability, a constant transfer number, and which can transmit high torque. During toothed gear operation, the surfaces of the teeth slide, which gives rise to friction forces and wears their working surfaces. To prevent this, the surfaces of the teeth need constant lubrication. This paper considers the design of a gear tooth engagement, which does not have friction between the surfaces of the teeth since they roll over each other without slipping. The profile of the tooth of such a gear is outlined by congruent arcs, symmetrical relative to the line that connects the center of rotation of the toothed wheel with the top of the tooth. These symmetrical curves at the top of the tooth intersect at the predefined angle. In the depressions of the wheel, adjacent teeth also intersect at the same angle. Such a condition can be ensured by a curve that at all its points crosses the radius-vector emanating from the coordinate origin, also at a stable angle equal to half of the given one. This curve is a logarithmic spiral. If the number of teeth of the drive and driven wheels is the same, then their teeth are congruent. Otherwise, the profiles of the teeth would differ but they could be outlined by congruent arcs of the same logarithmic spiral of the same length taken from different areas of the curve. The minimum possible angle at the top of the teeth is straight. At acute angle, the toothed gear operation is impossible. To build gear wheels with a right angle at the top of the tooth, it would suffice to set the number of teeth of the drive and driven wheels. The center-to-center distance is calculated using the derived formula. The transfer number of such a gear is variable but, with an increase in the number of teeth, the range of its change decreases. The algorithm of wheel construction is given.

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