Pub Date : 2022-06-24DOI: 10.31891/2079-1372-2022-104-2-49-54
V. S. Pyliavsky, Y. Polunkin, O. Haidai, O. B. Yanchenko
Motor fuels are the source of energy for internal combustion engines, and also a lubricant for friction units of the fuel equipment of automobile, aircraft and ship engines. The reliability and service life of the entire mechanism depend on the antiwear properties of fuels. Traditional anti-wear additives containing sulfur, phosphorus, chlorine, etc., are not applicable in motor fuels due to restrictions on emissions of toxic compounds. To improve the antiwear properties of lubricants, it is possible to use a new class of spatial carbon compounds - fullerene-like nanoparticles (FLNs). This work shows that modification of liquid hydrocarbon motor fuels with fullerene-like nanoparticles (FLNs) increases the antiwear properties of fuels
{"title":"Effect of fullerene-like nanoparticles at low concentrations on the anti-wear properties of motor fuels","authors":"V. S. Pyliavsky, Y. Polunkin, O. Haidai, O. B. Yanchenko","doi":"10.31891/2079-1372-2022-104-2-49-54","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-49-54","url":null,"abstract":"Motor fuels are the source of energy for internal combustion engines, and also a lubricant for friction units of the fuel equipment of automobile, aircraft and ship engines. The reliability and service life of the entire mechanism depend on the antiwear properties of fuels. Traditional anti-wear additives containing sulfur, phosphorus, chlorine, etc., are not applicable in motor fuels due to restrictions on emissions of toxic compounds. To improve the antiwear properties of lubricants, it is possible to use a new class of spatial carbon compounds - fullerene-like nanoparticles (FLNs). \u0000This work shows that modification of liquid hydrocarbon motor fuels with fullerene-like nanoparticles (FLNs) increases the antiwear properties of fuels","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42928107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-24DOI: 10.31891/2079-1372-2022-104-2-13-19
V. Savulyak, А.А. Osadchuk
In this paper, processes of contact melting between steel plates, which arises after feeding the contact pulse of a contact welding machine, are studied, for cases when nanomaterials in the form of carbon nanofibers and powders of refractory metals are being located between the plates. It was established that the addition of carbon nanotubes allows to ensure the passage of contact melting with lower energy costs and to obtain high carbonaceous layers of considerable hardness, and the addition of doping elements makes it possible to control the structure, grainy and physical and mechanical properties of the formed material.
{"title":"Contact melting and structure formation in the system: α-iron-nanomaterials - common quality carbon steel","authors":"V. Savulyak, А.А. Osadchuk","doi":"10.31891/2079-1372-2022-104-2-13-19","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-13-19","url":null,"abstract":"In this paper, processes of contact melting between steel plates, which arises after feeding the contact pulse of a contact welding machine, are studied, for cases when nanomaterials in the form of carbon nanofibers and powders of refractory metals are being located between the plates. It was established that the addition of carbon nanotubes allows to ensure the passage of contact melting with lower energy costs and to obtain high carbonaceous layers of considerable hardness, and the addition of doping elements makes it possible to control the structure, grainy and physical and mechanical properties of the formed material.","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43069314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-24DOI: 10.31891/2079-1372-2022-104-2-35-41
S. Kharchenko, O. Kharchenko
The results of the study of glass-composite nanostructured self-lubricating coatings are presented. The developed glass composite is an antifriction material with an ultrafine structure. The structural components of these coatings significantly affect the graphitization process and provide an antifriction surface layer of α-graphite. The formation of this layer makes it possible to significantly minimize the contact parameters in the friction region. The developed antifriction nanostructured glass-ceramic self-lubricating coatings containing magnesium carbide and structural components that promote surface graphitization do not contain expensive and scarce components, meet environmental safety requirements, and have high performance characteristics. A significant effect of aluminoborosilicate in the form of a glass phase on the tribological properties of coatings is noted. An increase in adhesive strength is achieved by forming a surface layer of glassy sodium silicate. Using X-ray phase analysis, it was found that the intercalating elements in the subsurface zone-graphite system at the initial stage of the process were Mg2+, Al3+, Cu2+ ions, which randomly penetrated into the interlayer space of the graphite matrix. At sliding speeds of more than 3.0 m/s, intercalates of binary molecular compounds of these elements with oxygen were found in the layered system of graphite. Their intercalation is accompanied by a sequence of repetitive stages, which are reversible with a change in tribological parameters and are characterized by a specific transformation of the structure and, above all, by an increase in the distance between layers due to the influence of various types of interlayer defects and the introduction of intercalants. The presence of near-surface particles in the graphite layer does not affect the tribotechnical characteristics of the coatings. The developed glass-composite nanostructured self-lubricating coatings have high antifriction characteristics throughout the entire load-speed range
{"title":"Nanostructural glass composite coatings","authors":"S. Kharchenko, O. Kharchenko","doi":"10.31891/2079-1372-2022-104-2-35-41","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-35-41","url":null,"abstract":"The results of the study of glass-composite nanostructured self-lubricating coatings are presented. The developed glass composite is an antifriction material with an ultrafine structure. The structural components of these coatings significantly affect the graphitization process and provide an antifriction surface layer of α-graphite. The formation of this layer makes it possible to significantly minimize the contact parameters in the friction region. \u0000The developed antifriction nanostructured glass-ceramic self-lubricating coatings containing magnesium carbide and structural components that promote surface graphitization do not contain expensive and scarce components, meet environmental safety requirements, and have high performance characteristics. A significant effect of aluminoborosilicate in the form of a glass phase on the tribological properties of coatings is noted. An increase in adhesive strength is achieved by forming a surface layer of glassy sodium silicate. Using X-ray phase analysis, it was found that the intercalating elements in the subsurface zone-graphite system at the initial stage of the process were Mg2+, Al3+, Cu2+ ions, which randomly penetrated into the interlayer space of the graphite matrix. At sliding speeds of more than 3.0 m/s, intercalates of binary molecular compounds of these elements with oxygen were found in the layered system of graphite. Their intercalation is accompanied by a sequence of repetitive stages, which are reversible with a change in tribological parameters and are characterized by a specific transformation of the structure and, above all, by an increase in the distance between layers due to the influence of various types of interlayer defects and the introduction of intercalants. \u0000The presence of near-surface particles in the graphite layer does not affect the tribotechnical characteristics of the coatings. The developed glass-composite nanostructured self-lubricating coatings have high antifriction characteristics throughout the entire load-speed range","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47015176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-24DOI: 10.31891/2079-1372-2022-104-2-55-63
V. Aulin, S. Lysenko, A. Hrynkiv, D. Holub
The article gives a thermodynamic substantiation of the direction of nonequilibrium processes in tribocouples of machine parts, in tribosystems, based on the principles of maximum and minimum entropy. It is clarified how nonequilibrium processes can be substantiated on the basis of the minimum and maximum function of entropy production: linear and nonlinear nonequilibrium processes and their different thermodynamics. The entropy production function is considered as a function of thermodynamic force flows and thermodynamic flows. The theory of nonequilibrium processes is based on the Liouville equation for classical tribosystems, taking into account external influences or perturbations. It is shown that in thermodynamic processes in tribosystems the principle of entropy maximization is realized as the second principle of synergetics.
{"title":"Thermodynamic substantiation of the direction of nonequilibrium processes in triadconjugations of machine parts based on the principles of maximum and minimum entropy","authors":"V. Aulin, S. Lysenko, A. Hrynkiv, D. Holub","doi":"10.31891/2079-1372-2022-104-2-55-63","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-55-63","url":null,"abstract":"The article gives a thermodynamic substantiation of the direction of nonequilibrium processes in tribocouples of machine parts, in tribosystems, based on the principles of maximum and minimum entropy. It is clarified how nonequilibrium processes can be substantiated on the basis of the minimum and maximum function of entropy production: linear and nonlinear nonequilibrium processes and their different thermodynamics. The entropy production function is considered as a function of thermodynamic force flows and thermodynamic flows. \u0000The theory of nonequilibrium processes is based on the Liouville equation for classical tribosystems, taking into account external influences or perturbations. It is shown that in thermodynamic processes in tribosystems the principle of entropy maximization is realized as the second principle of synergetics.","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45370658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-24DOI: 10.31891/2079-1372-2022-104-2-20-27
D. Marchenko, K. Matvyeyeva
The article presents the results of tribological research on the most promising way to restore and increase the wear resistance of engine valves by developing a method of gas nitriding. It is established that with increasing operating time the guide bushings of the outlet connections wear out with the displacement of the axis of the forming surfaces of the hole. Characteristic significant displacement of the axes of the inlet connections is not detected, ie. their wear on the diameter of the hole is 1.5 ... 3 times less than the wear of the exhaust bushings, the values of the displacement of the axes are within the error of the measuring instrument. The average value of ovality is greater in the exhaust seats - the maximum beating values of the intake seats are 0.34 mm, exhaust - 0.22 mm. It is proved that the non-uniformity of the wear of the sleeve hole is determined by the balance of acting forces, which, in turn, are determined by deviations from the optimal ratios μ and e. the side of the rocker arm axis. Distortions of the valve in the longitudinal axis of the engine contribute to an earlier reduction in the tightness of the valve pairs. Redistribution of the valve end material with the formation of a wavy concentric surface, the shape of the contact spot on the rocker arm and the corresponding direction of wear of the saddle chamfer was observed in 43% of the studied connections. Technological means and methods for improving the quality of repair, measuring instruments for accurate study of the parameters of parts and connections of the valve group are given. The results of laboratory and operational tests are presented. A method of gas nitriding with an installation for its implementation has been developed, which provides an environmentally friendly method of low-temperature and high-temperature hardening, obtaining deeper and well-developed layers of the diffusion near-surface zone and reduces training, technological time in the process of strengthening and reducing energy consumption
{"title":"Increasing warning resistance of engine valves by gas nitrogenization method","authors":"D. Marchenko, K. Matvyeyeva","doi":"10.31891/2079-1372-2022-104-2-20-27","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-20-27","url":null,"abstract":"The article presents the results of tribological research on the most promising way to restore and increase the wear resistance of engine valves by developing a method of gas nitriding. It is established that with increasing operating time the guide bushings of the outlet connections wear out with the displacement of the axis of the forming surfaces of the hole. Characteristic significant displacement of the axes of the inlet connections is not detected, ie. their wear on the diameter of the hole is 1.5 ... 3 times less than the wear of the exhaust bushings, the values of the displacement of the axes are within the error of the measuring instrument. The average value of ovality is greater in the exhaust seats - the maximum beating values of the intake seats are 0.34 mm, exhaust - 0.22 mm. It is proved that the non-uniformity of the wear of the sleeve hole is determined by the balance of acting forces, which, in turn, are determined by deviations from the optimal ratios μ and e. the side of the rocker arm axis. Distortions of the valve in the longitudinal axis of the engine contribute to an earlier reduction in the tightness of the valve pairs. Redistribution of the valve end material with the formation of a wavy concentric surface, the shape of the contact spot on the rocker arm and the corresponding direction of wear of the saddle chamfer was observed in 43% of the studied connections. Technological means and methods for improving the quality of repair, measuring instruments for accurate study of the parameters of parts and connections of the valve group are given. The results of laboratory and operational tests are presented. A method of gas nitriding with an installation for its implementation has been developed, which provides an environmentally friendly method of low-temperature and high-temperature hardening, obtaining deeper and well-developed layers of the diffusion near-surface zone and reduces training, technological time in the process of strengthening and reducing energy consumption","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45241849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-24DOI: 10.31891/2079-1372-2022-104-2-28-34
O. Dykha, O. Babak, O. Makovkin, S. Posonskiy
It is established that at present the technology of anode-spark coatings in general is well studied. However, the lack of recommendations for the choice of modes of technological processes and tribological characteristics in different operating conditions limit the widespread introduction of this technology. The task of this work was to analyze the processes of anode-spark coatings, improve technology and study the wear resistance of samples processed by this and traditional anode technology. The development of technology for the application of protective coatings on valve metals in the conditions of spark discharge included the choice of electrolyte and mode of operation of the bath: voltage, current density, hydrodynamic conditions and other parameters. Wear resistance tests were performed on a special installation. Structurally, the installation is made in two positions, which allows you to test two samples with different load conditions at a constant sliding speed. The design of the installation implements the friction scheme of the liner shaft. The study of anode-spark coatings in the mode of limiting lubrication was studied in the environment of industrial oil. The wear criterion was the weight wear of the samples according to the results of weight measurements before and after wear. It is established that prolonged electrolysis in the conditions of sparking leads to the formation of anode coatings that exceed in their properties the films obtained by non-sparking oxidation. Comparative studies of the wear resistance of anode-spark coatings and galvanic anode coatings under the same test conditions showed that the wear of anode-spark coatings is almost twice lower for the entire load range. The considered technology is recommended for increase of wear resistance of elements of devices from the aluminum alloys working in the conditions of corrosion and mechanical wear
{"title":"Tribological properties of anode-spark coatings on aluminum alloys","authors":"O. Dykha, O. Babak, O. Makovkin, S. Posonskiy","doi":"10.31891/2079-1372-2022-104-2-28-34","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-28-34","url":null,"abstract":"It is established that at present the technology of anode-spark coatings in general is well studied. However, the lack of recommendations for the choice of modes of technological processes and tribological characteristics in different operating conditions limit the widespread introduction of this technology. The task of this work was to analyze the processes of anode-spark coatings, improve technology and study the wear resistance of samples processed by this and traditional anode technology. The development of technology for the application of protective coatings on valve metals in the conditions of spark discharge included the choice of electrolyte and mode of operation of the bath: voltage, current density, hydrodynamic conditions and other parameters. Wear resistance tests were performed on a special installation. Structurally, the installation is made in two positions, which allows you to test two samples with different load conditions at a constant sliding speed. The design of the installation implements the friction scheme of the liner shaft. The study of anode-spark coatings in the mode of limiting lubrication was studied in the environment of industrial oil. The wear criterion was the weight wear of the samples according to the results of weight measurements before and after wear. It is established that prolonged electrolysis in the conditions of sparking leads to the formation of anode coatings that exceed in their properties the films obtained by non-sparking oxidation. Comparative studies of the wear resistance of anode-spark coatings and galvanic anode coatings under the same test conditions showed that the wear of anode-spark coatings is almost twice lower for the entire load range. The considered technology is recommended for increase of wear resistance of elements of devices from the aluminum alloys working in the conditions of corrosion and mechanical wear","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48691139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-24DOI: 10.31891/2079-1372-2022-104-2-42-48
О.О. Skvortsov, Оksana Mikosianchyk
Р The use of composition material based on the polyamide (caprolon) Ertalon 4.6 as an anti-friction material in the sliding units in the aviation industry is considered. Low carbon electrotechnical sheet steel 21864 of different concentrations was used as filler of composite material. The article presents the thermal calculation of plain bearings with polymer insert in different operating modes. It is determined that the addition of a metal filler to polyamide causes a temperature decrease in the friction zone due to the effective heat exchange from the shaft to the bearing housing. The article conducts a study of tribo-technical properties of the proposed composite material on installation PT-4C under sliding conditions according to the scheme “cylinder-plane”, as well as modeling of the support unit in the software complex DS SolidWorks. It has been experimentally determined that the addition of finely dispersed steel filler enhances the antifriction properties of the Ertalon 4.6 polymer and extends the temperature range of the composite insert performance. Increasing the filler concentration to 20% results in a reduction of the friction coefficient by an average of 3.6 times and an increase in the temperature range of composite material use to 100 °C. The load-bearing capacity of the composite material bushing is increased to 25 MPa at a 20% filler concentration respectively. The practical significance of the work lies in the analysis of the antifriction properties of the polymer with metallic filler in comparison with the polymer without filler, which will prove the effectiveness of the use of such polymers in friction units instead of non-ferrous metals (bronze, babbitt).
{"title":"Estimation of tribotechnical parameters of composite polymer with metal filler","authors":"О.О. Skvortsov, Оksana Mikosianchyk","doi":"10.31891/2079-1372-2022-104-2-42-48","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-42-48","url":null,"abstract":"Р \u0000The use of composition material based on the polyamide (caprolon) Ertalon 4.6 as an anti-friction material in the sliding units in the aviation industry is considered. Low carbon electrotechnical sheet steel 21864 of different concentrations was used as filler of composite material. The article presents the thermal calculation of plain bearings with polymer insert in different operating modes. It is determined that the addition of a metal filler to polyamide causes a temperature decrease in the friction zone due to the effective heat exchange from the shaft to the bearing housing. The article conducts a study of tribo-technical properties of the proposed composite material on installation PT-4C under sliding conditions according to the scheme “cylinder-plane”, as well as modeling of the support unit in the software complex DS SolidWorks. It has been experimentally determined that the addition of finely dispersed steel filler enhances the antifriction properties of the Ertalon 4.6 polymer and extends the temperature range of the composite insert performance. Increasing the filler concentration to 20% results in a reduction of the friction coefficient by an average of 3.6 times and an increase in the temperature range of composite material use to 100 °C. The load-bearing capacity of the composite material bushing is increased to 25 MPa at a 20% filler concentration respectively. \u0000The practical significance of the work lies in the analysis of the antifriction properties of the polymer with metallic filler in comparison with the polymer without filler, which will prove the effectiveness of the use of such polymers in friction units instead of non-ferrous metals (bronze, babbitt).","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44855825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-17DOI: 10.31891/2079-1372-2022-104-2-6-12
I. Shepelenko, E. Posviatenko, Y. Nemyrovskyi, V. Cherkun, I.P. Rybak
The article is devoted to the creation of new processing technologies through the use of drawing. It is determined that the most effective processes of surface engineering of machine parts are hybrid technologies. The advantages of such technologies due to obtaining a new effect from the impact on the part by two or more dissimilar processes belonging to one or different groups of surface engineering methods are noted. It is proved that the use of hybrid technologies on the basis of stretching allows to combine the advantages of different methods, first of all cold plastic deformation methods, in combination with others. The use of deforming drawing provides in the surface layer favorable for the part of the compressive residual stresses, increase the wear resistance of the surface, as well as the strength of the part. The results of the research allowed to classify the deforming drawing as a class of surface engineering methods. On the example of processing of cylinder liners of internal combustion engines the combined technology containing operations of deforming drawing and finishing antifrictional non-abrasive processing is developed. It is shown that the use of deforming drawing has significantly improved the quality of antifriction coating. The use of deforming drawing to the component of the hybrid method with the subsequent pulsed nitriding is considered.It is established that when nitriding cutting tool products, hybrid process modes should be set in order to create the most effective nitride zone. In the case of processing of road vehicle parts, special attention should be paid to obtaining a diffusion layer. The efficiency of the offered technologies on the basis of stretching is established. Determining the prospects for further use of deforming drawing as an integral part of hybrid technologies
{"title":"Creation of new technological methods for surface engineering based on broaching","authors":"I. Shepelenko, E. Posviatenko, Y. Nemyrovskyi, V. Cherkun, I.P. Rybak","doi":"10.31891/2079-1372-2022-104-2-6-12","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-6-12","url":null,"abstract":"The article is devoted to the creation of new processing technologies through the use of drawing. It is determined that the most effective processes of surface engineering of machine parts are hybrid technologies. The advantages of such technologies due to obtaining a new effect from the impact on the part by two or more dissimilar processes belonging to one or different groups of surface engineering methods are noted. It is proved that the use of hybrid technologies on the basis of stretching allows to combine the advantages of different methods, first of all cold plastic deformation methods, in combination with others. The use of deforming drawing provides in the surface layer favorable for the part of the compressive residual stresses, increase the wear resistance of the surface, as well as the strength of the part. The results of the research allowed to classify the deforming drawing as a class of surface engineering methods. On the example of processing of cylinder liners of internal combustion engines the combined technology containing operations of deforming drawing and finishing antifrictional non-abrasive processing is developed. It is shown that the use of deforming drawing has significantly improved the quality of antifriction coating. The use of deforming drawing to the component of the hybrid method with the subsequent pulsed nitriding is considered.It is established that when nitriding cutting tool products, hybrid process modes should be set in order to create the most effective nitride zone. In the case of processing of road vehicle parts, special attention should be paid to obtaining a diffusion layer. The efficiency of the offered technologies on the basis of stretching is established. Determining the prospects for further use of deforming drawing as an integral part of hybrid technologies","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41690315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-30DOI: 10.31891/2079-1372-2022-103-1-82-91
V. Aulin, A. Hrynkiv, S. Ly, O. Livitskyi
This work is devoted to the study of the conditions of effective performance of triad couplings of parts made of polymeric composite materials. The stress state of the material is associated with the characteristics of the accumulation of dislocations, the energy of activation of their movement. The average stress, friction stress is determined. Based on this, expressions for estimating critical stresses and loads on tribocouple parts are obtained. The distribution of the force on the tribocoupling of parts is determined taking into account the quality characteristics of the friction surfaces, modulus of elasticity and Poisson's constant of the components of the polymer composite material. This problem is considered for tribocouples of parts of various kinds. Expressions for calculation of nominal pressures at different types of contact of material of details of tribocoupling are received, and also the equations on which it is possible to estimate in them values of nominal critical pressure are resulted. The conditions for efficient operation of tribocoupling of parts made of polymer composite materials are clarified. It is determined that a significant increase in the nominal critical pressure on the tribocoupling is possible with the use of high-modulus fillers, the modulus of elasticity of which is greater than the modulus of elasticity of the polymer matrix
{"title":"Substantiation of conditions of effective working capacity of tribocouples of the details made of polymeric composite materials with high-modulus fillers","authors":"V. Aulin, A. Hrynkiv, S. Ly, O. Livitskyi","doi":"10.31891/2079-1372-2022-103-1-82-91","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-103-1-82-91","url":null,"abstract":"This work is devoted to the study of the conditions of effective performance of triad couplings of parts made of polymeric composite materials. The stress state of the material is associated with the characteristics of the accumulation of dislocations, the energy of activation of their movement. The average stress, friction stress is determined. Based on this, expressions for estimating critical stresses and loads on tribocouple parts are obtained. The distribution of the force on the tribocoupling of parts is determined taking into account the quality characteristics of the friction surfaces, modulus of elasticity and Poisson's constant of the components of the polymer composite material. This problem is considered for tribocouples of parts of various kinds. \u0000Expressions for calculation of nominal pressures at different types of contact of material of details of tribocoupling are received, and also the equations on which it is possible to estimate in them values of nominal critical pressure are resulted. \u0000The conditions for efficient operation of tribocoupling of parts made of polymer composite materials are clarified. It is determined that a significant increase in the nominal critical pressure on the tribocoupling is possible with the use of high-modulus fillers, the modulus of elasticity of which is greater than the modulus of elasticity of the polymer matrix","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44999026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-29DOI: 10.31891/2079-1372-2022-103-1-65-75
O. Dykha, A. Staryi, V. Dytyniuk, M. Dykha
The efficiency of plastic oil is determined by the duration of its retention on the surface. Evaluation of the effectiveness of plastic lubricants depends on their mechanical properties. It is proposed to use the dependence of hardness on time when pressing a spherical indenter as one of the basic characteristics of the mechanical properties of plastic oils. The method of determining the function of oil hardness is based on the mechanics of contact interaction of a solid ball and a plane presented in this work, which has the property of creep according to the flow theory. One of the main methods of testing the deformation properties of plastic lubricants is to determine the number of penetrations. The number of oil penetrations is determined by the depth of indentation of the indenter; more informative for such a process is the ultimate pressure (hardness), which actually reflects the phenomenon of resistance to indenter indentation in the material. For uniform distribution of pressure under a spherical indenter the technique of construction of function of dynamic hardness of plastic materials is defined and on the basis of tests results of construction of dynamic hardness are received. Tests on contact creep of plastic lubricants are carried out, functions of dynamic hardness are received and the analysis of influence of character of change of dynamic hardness on wear processes in the presence of lubricants is carried out. To analyze the influence of deformation properties on the tribological properties of lubricants, comparative tests of the two above-mentioned types of lubricants on a four-ball friction device were performed. It was found that Litol-24 oil has the best wear resistance. The nonlinear period of running-in for this oil is practically absent that, obviously, under the given conditions of tests is connected with more stable in time deformation properties.
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