Ìåæäóíàðîäíûé íàó÷íûé æóðíàë
Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî ÍÀÍ Áåëàðóñè, Ãîìåëü, Áåëàðóñü
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ÒÐÅÍÈÅ È ÈÇÍÎÑ Ìåæäóíàðîäíûé íàó÷íûé æóðíàë Èçäàòåëü: Èíñòèòóò ìåõàíèêè ìåòàëëîïîëèìåðíûõ ñèñòåì èì. Â.À. Áåëîãî ÍÀÍ Áåëàðóñè, Ãîìåëü, Áåëàðóñü |
Zharov I. A.
Effect of boundary conditions on nondimensional characteristics of hydrodynamic bearings under steady-state loading. pp. 438--443
Summary: Accuracy is estimated of method early proposed. Effect of boundary conditions on nondimensional characteristics of sliding bearings is studied. The loaded zone boundaries are determined. Definition is given of inlet and trailing edges of the hydrodynamic film. A new mode of thought is proposed on solution of the Reynolds equation for an infinitely long bearing. Approximate formulas are derived for start and end angles of loaded zone. Flaws are listed of the presently accepted characteristics which exhibit sliding bearing efficiency. An approach is suggested to selection of the characteristics, their calculation and inference of approximate formulas.
Penkin N. S., Stepurin V. F., Stepurin P. V.
Moment of forces of friction on contact of a torus metal indentor with an elastic cylindrical surface. pp. 444--449
Summary: A method for definition of current and maximum moment of friction forces as function of turn comer of metal compression lug in the throttle about elastic compression lug of the case is proposed. Examples of account for a throttle door with a nominal diameter of 250 mm are put. The design of that throttle door is developed in Stavropol Technical University. The received results are recommended as help for a choice of a drive and realization strength accounts for the shaft, disk and other details rubberized throttle doors.
Balakin V. A., Sergienko V. P., Komkov O. Yu.
Heat transfer in friction contact at engagement of disc clutches and brakes. pp. 450--455
Summary: The formulas are derived for heat partition factor in the friction contact of disc clutches and brakes. The following assumptions are taken: heat source is flat and uniformly distributed over nominal contact area, there is no temperature jump at the interface of mating bodies, and heat transfer into environment is absent.
Serdobintsev Yu. P. Ivannikov A. V.
Life prediction of precision friction pairs in lproduction equipment by modelling. 1. Force, geometric and design factors at accelerated wear tests. pp. 456--459
Summary: The shape of the lubricating film that provides the plane (one dimensional) slider bearing with maximum stiffness is obtained. Calculus of variations is used to do this. The stiffness of the bearing with the obtained film shape exceeds that of the bearing with maximum loading capacity approximately by 23% when their static load is the same.
Gaivoronskii A. T., Petrov L. A., Pinkovskii V. P., Rastikhin A. V.
Prediction of shear stress in sliding lubricated surfaces under high contact load. pp. 460--463
Summary: An influence of various additives to lubricant on shear stress under contact load above the yield point of deforming material was determined by experiment. Complex compounds with perfluorocarbon and hydrocarbon residues as well as with carbonyl, dicarbonyl and tricarbonyl groups were selected as additives to base oil BM-1. The semisynthetic grease Curtis was used for comparison. New procedure is proposed for determination of shear stress in rubbing surfaces.
Nachovnyi I. I., Burya A. I., Chernetskii S. A., Zhirnyi A. I.
Account of a contact interaction parameters of sealing friction pairs parameters. pp. 464--469
Summary: The mechanism of contact formation of polymer element with reciprocating rod is considered. A problem is solved of nominal contact pressure with account of deformation of sealing element. Comparison of calculated and test leaks in the seal has shown satisfactory agreement.
Konchits V. V., Kim Ch. K.
Contact spots heating by electrical current. Part 1. pp. 470--479
Summary: Special features of contact spots heating are considered when electric current passes through the interface of metals. Calculating correlations are presented for contact temperature evaluation at different mechanisms of current passage. The emphasis is made on the contact with thin (nanometer range) boundary films. Current densities are evaluated which need to result in the given contact temperature at both absence and presence of boundary films.
Han H. G., Kong H., Kwon O. K., Myshkin N. K.
Wear life of MoS2-bonded-films for tribo-testers with different contact configuration. pp. 480--487
Summary: Friction and wear behavior of MoS2-bonded-films were evaluated using a block-on-ring tribotester, and their properties were compared with those obtained with a Falex tester. Test results showed that friction and wear performance was significantly affected by the contact configuration of tribotester, and the wear life for a Block-on-ring tester was mostly governed by the content of resin binder. In order to investigate the effects of resin binder on wear life, various filler-to-binder and chemical modification of resin were attempted and their wear lives were evaluated. Adhesive properties of resin binders were also evaluated by using a scratch tester. Test result showed that a MnS2-bonded-film lubricant with 40 weight percent of amino-compound modified epoxy resin binder showed the longest wear life when tested with a Block-on-ring tribo-tester.
Bekker M. S., Kulikov M. Yu., Egorycheva E.V., Starikov A. V.
Structural self-organization and durability of high-speed steel cutting tools. pp. 488--492
Summary: In the given article questions of transformation of dislocations structure, occurring in contact layers of the HSS tool during cutting, and also its influence on serviceability of this tool are cosidered. Use of the X-ray analysis during wear process of the cutting tool in a wide range of cutting speeds has allowed to study transformation of defects of crystal structure occurring in contact layers of the HSS tool. Results of research have allowed to develop physical model of wear process of the HSS tool.
Pamfilov E. A, Gryadunov S. S.
Improvement of wear resistance of earth excavating machinery operating at low temperatures by application of chrome-vanadium alloys. pp. 493--505
Summary: Potentials of chrome-vanadium alloys to improve wear resistance of parts of earth excavating machinery operating at low temperatures have been investigated. Behavior of alloys with different matrices after casting, surfacing and hot plastic deformation has been examined within the range of low climatic temperatures and rated using metallographic. X-ray structural, X-ray spectral, fractographic, tribospectral and sclerometric techniques. The alloys were tested for wear by friction and impacts against fixed abrasives in order to rate their wear resistance and to identify the mechanisms of abrasive and impact-abrasive wear, the effects of structural conditions and test temperatures. Guides are proposed for applications of the alloys and their machining.
Zernin M. V.
Experimental evaluation of durability of sprayed and gauze-reinforced babbitt layers on sliding bearings. pp. 506--514
Summary: Wear resistance and fatigue durability of tin-based babbitt layers produced by spraying or containing a metallic gauze have been investigated. The results of test fabrication of babbitt wire for spraying are described in brief. An alternative of the method of artificial bases is proposed for measuring small wear quantities which do not require precise alignment of the routes of consecutive profilometry. Babbitt layers have been tested for wear in the boundary mode of friction against a steel counterbody. The effect of the babbitt layer thickness and several different processes of application of babbitt to steel, reinforcement of babbitt with a steel and bronze gauze have been evaluated by testing model bearings for fatigue durability in the conditions close to those of actual operation.
Surgunt Ya. M., Khrustaleva E. I.
Studies of coatings deposited by anode-microarc oxidation. pp. 515--517
Summary: Effect is studied of deposition conditions on the formation and properties of ceramic coatings used in friction units of textile industry.
Panteleenko F. I., Snarskii A. S.
Features of tribological behavior of boron-containing tool--blank tribosystem. pp. 518--522
Summary: Simulation of metal cutting process is shown when using the boron-containing tool at sliding friction. Boron alloying is shown to befavorable from the point of view of microstructure optimization and lubrication by boron oxide.
Ginzburg B. M., Krasnyi V. A., Kozyrev Yu. P., Bulatov V. P.
Decrease in the fretting-corrosion of the metals by fullerene C60. pp. 523--526
Summary: It was investigated the influence of C60 additives to industrial oil 1-40A and grease "Litol-24" on the fretting-corrosion of steel and brass samples. It was shown that these additives decrease in fretting-corrosion significantly.
Tsybulskaya L. S., Gaevskaya T. V.
The effect of highly dispersed diamond on the electrodeposition of nickel and nickel--boron alloy. pp. 527--534
Summary: Composition of electrodeposited Ni--B--C (diamond) films, their structural feature were investigated by means of X-ray diffraction, electron microscopy, Auger-spectroscopy. Boron and diamond contents in the coating were shown to vary from 0.2 to 1.5 wt.% for diamond and 0.8--4.7 wt.% for boron depending on plating conditions (cathodic current density, temperature), concentration of Na2Bi10H10 and highly dispersed diamond in electrolytes. X-ray analysis showed that nickel-diamond coating have the structure of crystalline nickel with the lattice parameter a = 3.524 A° and the size of nickel crystallites 260--310 A° no matter what the amount of diamond codeposited with nickel. Boron incorporation into nickel and nickel-diamond coating results in the change in the phase composition thereof, that is in the transformation of policrystalline solid solution of boron in nickel into the amorphous alloy, the crystallite size and lattice parameter being decreased. The relationship between the properties (microhardness, wear resistance) and composition and structure of the coating was established. Electrodeposited Ni--B--C (2.3 wt.% B, 0.5 wt.% C) coatings are characterized by the high microhardness (8.1 GPa) and wear resistance (0.2 • 10-7 rel. un.). The heat treatment results in a significant increase of nickel--boron diamond film wear resistance which makes this coating the most promising for manufacturing metal-cutting tools.
Gorochovskii G. A., Graevskaya L. M., Gorochovskya N. K.
Tribology of running-in. pp. 535--542
Summary: The running-in of friction couples is a process of forming the thin surface layer of heterogeneous metal organic structure. The run-in kinematics is characterized by the branching point in which the system turns from unsteady state into the state of current equilibrium reflecting the stationary wear.
Kholodilov O. V., Sergienko V. S, Moiseeva T. M., Levin I. A.
Estimation of triboengineering characteristics of friction materials based on statistical parameters of debris. pp. 543--548
Summary: The results of the morphological analysis of the debris of friction materials modified with structural plastifiers manifest that such analysis can be useful in a number of cases to optimize the triboengineering behavior of friction composites and to estimate their performance without time-consuming wear tests.
Kovalchenko A. M., Fogt O.
Effect of air humidity on wear of cast iron--alumina couples at reciprocating sliding. pp. 549--557
Summary: The unlubricated friction and wear of cast iron under different air humidities during reciprocating sliding against an alumina counterbody was studied under ring-on-plate testing conditions. The variations of the wear of cast iron and friction coefficient with humidity have been established. The wear of alumina plate was not registered. The minimum coefficient of friction occurred during friction in distilled water (µ = 0.4). In the range of humidity from 3 to 90%, the friction coefficient has values from 0.8 to 1.1. The dependence of wear on humidity has an intricate character due to the existence of different processes which take place during friction. The maximum wear of the cast iron rings occurred with 3% relative humidity of air, the minimum under 40% humidity and in the water. Oxidational wear of cast iron occurred for the whole humidity range. However the mechanical destruction (abrasive wear) of the worn surface of cast iron increased with a decrease in humidity, mainly owing to the abrasive behaviour of the debris. Scanning electron microscopy investigations confirmed this steady trend.
Fedonin O. N.
Technological provision of wear-resistance of parts due to change of a physico-mechanical state of a surface layer. pp. 558--562
Summary: A problem of creation of a physico-mechanical state of a surface layer of parts is considered. The transmission of energy is carried out at the expense of power and thermal effect of the tool on a parts. These effects cause two opposite processes -- hardening and loss of strength. Dependence of the power factor on a degree of hardening of a material is used. The influence of the thermal factor is taken into account by change of mechanical properties of a material. The theoretical equation of a degree of hardening of a material can be used at definition of wear-resistance of a part depending on conditions of its machining.
Gulyaev Yu. V.
On the failure causes and increase in workability of meliorative machines. pp. 563--565
Summary: Survey is made of the failure causes of meliorative machines. Processing quality is found to be the most prominent factor of failures. Recommendations are made on the improvement of workability of meliorative machines.
ÊÀËÅÍÄÀÐÜ ÊÎÍÔÅÐÅÍÖÈÉ. p. 566
