Pub Date : 2022-09-26DOI: 10.31891/2079-1372-2022-105-3-49-54
O. Stelmakh, Hongyu Fu, Yiqiao Guo, Xinbo Wang, Hao Zhang, O. Dykha
The proposed Adhesion-Deformation-Hydrodynamic model of friction and wear is based on the relationship of elastic-deformation processes in the surfaces of curvilinear contacts with hydrodynamic regular processes of extrusion and rarefaction in lubricating layers in tribocontacts, as well as with the processes of primary adhesion of friction surfaces and subsequent acts of adhesive wear. The proposed Adhesion-Deformation-Hydrodynamic model of friction and wear and its main provisions on the relationship between extrusion, rarefaction in lubricating layers and primary adhesion of friction surfaces of curvilinear contacts cover the entire load-speed range and all modes of lubrication of friction surfaces
{"title":"Adhesion-Deformation-Hydrodynamic model of friction and wear","authors":"O. Stelmakh, Hongyu Fu, Yiqiao Guo, Xinbo Wang, Hao Zhang, O. Dykha","doi":"10.31891/2079-1372-2022-105-3-49-54","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-105-3-49-54","url":null,"abstract":"The proposed Adhesion-Deformation-Hydrodynamic model of friction and wear is based on the relationship of elastic-deformation processes in the surfaces of curvilinear contacts with hydrodynamic regular processes of extrusion and rarefaction in lubricating layers in tribocontacts, as well as with the processes of primary adhesion of friction surfaces and subsequent acts of adhesive wear. The proposed Adhesion-Deformation-Hydrodynamic model of friction and wear and its main provisions on the relationship between extrusion, rarefaction in lubricating layers and primary adhesion of friction surfaces of curvilinear contacts cover the entire load-speed range and all modes of lubrication of friction surfaces","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45926402","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 : 2022-09-26DOI: 10.31891/2079-1372-2022-105-3-27-33
M. Stechyshyn, V. Lyukhovets’, N.M. Stechyshyn, M. Tsepenyuk
The article discusses the method of conducting tribological studies at the limit modes of friction of nitrided and non-nitrided steels 20 and 45 in order to achieve a comparison of the results of laboratory tests with operational data. The relationship of structural phases in time is significantly influenced by the initial state of the surface and its physical and mechanical characteristics, pressure on the contact surface, sliding speed, and all these parameters for the limit mode of friction are closely related. Carrying out tests on the wear resistance of samples made of different materials and with significantly different characteristics of the surface layer at the same parameters of the test regime is impossible in most cases, since the obtained results are problematic to compare.
{"title":"Wear resistance of structural steels nitroded in cyclic-commuted discharge at limit modes of friction","authors":"M. Stechyshyn, V. Lyukhovets’, N.M. Stechyshyn, M. Tsepenyuk","doi":"10.31891/2079-1372-2022-105-3-27-33","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-105-3-27-33","url":null,"abstract":"The article discusses the method of conducting tribological studies at the limit modes of friction of nitrided and non-nitrided steels 20 and 45 in order to achieve a comparison of the results of laboratory tests with operational data. The relationship of structural phases in time is significantly influenced by the initial state of the surface and its physical and mechanical characteristics, pressure on the contact surface, sliding speed, and all these parameters for the limit mode of friction are closely related. Carrying out tests on the wear resistance of samples made of different materials and with significantly different characteristics of the surface layer at the same parameters of the test regime is impossible in most cases, since the obtained results are problematic to compare.","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49534040","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 : 2022-09-26DOI: 10.31891/2079-1372-2022-105-3-61-69
O. Rudyk, P. Kaplun, K.E. Golenko, V. Honchar, M. Poberezhnyi
The article is devoted to the study of corrosion resistance and wear resistance (sliding friction) of unhardened and glow discharge nitrided (ion or ion-plasma nitriding) structural steels 20, 45, 45X and 38X2МЮА in distilled water. The influence of temperature (T = 793 – 873 K), the composition of the saturating mixture (nitrogen N2, argon Ar and propane C3H8) and its pressure (Р = 80 – 450 Pa), the duration of the process on the structure and phase composition of the nitrided layers was studied (carried out using metallographic and X-ray structural analyses). A comparison of the physical and mechanical characteristics of the surface layer of unhardened and nitrided steels before and after the tests was carried out and it was concluded that nitrided steels have an increased service life due to greater hardness, corrosion resistance and wear resistance. It is recommended to increase the corrosion resistance of the studied steels in distilled water, to carry out their ionic nitriding in a nitrogen-containing atmosphere, and to increase wear resistance - in a carbon-containing atmosphere (carbonitriding).
{"title":"Investigation of corrosion and wear resistance of steels nitrided in a glow discharge in distilled water","authors":"O. Rudyk, P. Kaplun, K.E. Golenko, V. Honchar, M. Poberezhnyi","doi":"10.31891/2079-1372-2022-105-3-61-69","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-105-3-61-69","url":null,"abstract":"The article is devoted to the study of corrosion resistance and wear resistance (sliding friction) of unhardened and glow discharge nitrided (ion or ion-plasma nitriding) structural steels 20, 45, 45X and 38X2МЮА in distilled water. The influence of temperature (T = 793 – 873 K), the composition of the saturating mixture (nitrogen N2, argon Ar and propane C3H8) and its pressure (Р = 80 – 450 Pa), the duration of the process on the structure and phase composition of the nitrided layers was studied (carried out using metallographic and X-ray structural analyses). A comparison of the physical and mechanical characteristics of the surface layer of unhardened and nitrided steels before and after the tests was carried out and it was concluded that nitrided steels have an increased service life due to greater hardness, corrosion resistance and wear resistance. It is recommended to increase the corrosion resistance of the studied steels in distilled water, to carry out their ionic nitriding in a nitrogen-containing atmosphere, and to increase wear resistance - in a carbon-containing atmosphere (carbonitriding).","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44634844","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 : 2022-09-26DOI: 10.31891/2079-1372-2022-105-3-96-107
V. Aulin, S. Lysenko, A. Hrynkiv, M. Pashynskyi
The article provides an analytical justification of the flow of tribological processes of coupling of "shaft-sleeve" parts, which simulates the functioning of sliding bearings and cylindrical joints of machines. The main attention is paid to such characteristics as contact pressure, static and dynamic forces, the criterion of the product of the total pressure on the sliding speed, the work of friction forces and its transition into thermal energy in the friction zone for polymer (based on polyamide P-68) and polymer-composite coatings (based on P-68 with kaolin filler) on the working surfaces of the parts. A comparative analysis of the functioning and tribological characteristics of the couplings of parts without coatings is presented. Experimentally, on the basis of tests of samples on the MИ-1M friction machine, a significant reduction in wear and an increase in the relative wear resistance of samples with polymer-composite coatings in the modes of friction without lubrication (by 1.3...1.4 times) and marginal friction (in 1.2...1.3 times), as well as a decrease in the temperature in the friction zone (365 K and 347 K) compared to the polymer coating.
{"title":"Improvement of tribological characteristics of coupling parts \"shaft-sleeve\" with polymer and polymer-composite materials","authors":"V. Aulin, S. Lysenko, A. Hrynkiv, M. Pashynskyi","doi":"10.31891/2079-1372-2022-105-3-96-107","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-105-3-96-107","url":null,"abstract":"The article provides an analytical justification of the flow of tribological processes of coupling of \"shaft-sleeve\" parts, which simulates the functioning of sliding bearings and cylindrical joints of machines. The main attention is paid to such characteristics as contact pressure, static and dynamic forces, the criterion of the product of the total pressure on the sliding speed, the work of friction forces and its transition into thermal energy in the friction zone for polymer (based on polyamide P-68) and polymer-composite coatings (based on P-68 with kaolin filler) on the working surfaces of the parts. A comparative analysis of the functioning and tribological characteristics of the couplings of parts without coatings is presented. \u0000Experimentally, on the basis of tests of samples on the MИ-1M friction machine, a significant reduction in wear and an increase in the relative wear resistance of samples with polymer-composite coatings in the modes of friction without lubrication (by 1.3...1.4 times) and marginal friction (in 1.2...1.3 times), as well as a decrease in the temperature in the friction zone (365 K and 347 K) compared to the polymer coating.","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48468415","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 : 2022-06-25DOI: 10.31891/2079-1372-2022-104-2-71-79
V. Aulin, S. Lysenko, A. Hrynkiv, O. Derkach, D. Makarenko
The influence of the content of high-modulus filler on the assessment of the critical load on the conjugation of polymeric composite materials is theoretically substantiated from the tribological point of view. Various cases of destruction of polymeric composite materials are considered. The conditions under which the setting of polymeric composite materials is observed, as well as the conditions of their destruction are formulated. Both viscous and brittle fracture of polymeric composite materials are considered. The main focus is on critical loads and stresses depending on the content of high-modulus filler, taking into account the modulus of elasticity of the polymer matrix and filler and the nature of their destruction
{"title":"Influence of high-modulus filler content on critical load on tribocouples made of microheterophase polymer composite materials","authors":"V. Aulin, S. Lysenko, A. Hrynkiv, O. Derkach, D. Makarenko","doi":"10.31891/2079-1372-2022-104-2-71-79","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-71-79","url":null,"abstract":"The influence of the content of high-modulus filler on the assessment of the critical load on the conjugation of polymeric composite materials is theoretically substantiated from the tribological point of view. Various cases of destruction of polymeric composite materials are considered. The conditions under which the setting of polymeric composite materials is observed, as well as the conditions of their destruction are formulated. Both viscous and brittle fracture of polymeric composite materials are considered. The main focus is on critical loads and stresses depending on the content of high-modulus filler, taking into account the modulus of elasticity of the polymer matrix and filler and the nature of their destruction","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41405034","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 : 2022-06-25DOI: 10.31891/2079-1372-2022-104-2-80-86
A. Lopata, M. Holovashchuk, L. Lopata, E. Solovuch, S. Katerinich
The robots present the results of investigating the power of coatings, excluding electric arc (EAS) filings, and their comparison with the powers of coatings, excluding gas-flame filings. The porosity of the coating, taken from electric arc filings, was in the range of 8-10%. the adhesion strength was 80…100 MPa. The results of the investigations show the advantages and purpose of using electric arc sawing to improve and move the capacity of machine parts and transport mechanisms. In the work, the following factors are added to the process of electric arc sawing: storage of fuel sum, distance of sawing, dispersion of sawing and other. on authority cover. In the course of the investigation, the increase in resistance, adhesive strength, coating thickness, the term for the coating thickness, was determined by the parameters of the electric arc filing. The robots have considered the possibility of securing the necessary authorities influencing the surface with the method of advancing the resource of machine parts by way of regulation by the factors of EAS. Regulating the smoothness and temperature of the stream of transporting gas and particles, you can change the diameter of the droplet, increase the width and reduce the oxidation of the coating. The results of comparative analysis of the properties of coatings applied by electric arc spraying (EAS) using the products of combustion of propane-air mixture and gas-flame spraying (FSP) using gas-air mixture are presented. Under optimal conditions of the spraying process, the porosity of the coatings obtained by electric arc spraying is much lower compared to gas-flame spraying: 8-10% and 20-30%, respectively. Adhesion strength of coatings obtained by electric arc spraying increased by 1.8-2.2 times (from 30-40 MPa in gas-flame spraying to 100 MPa in electric arc), wear resistance increased by 2-2yu5 times.
{"title":"Properties of coatings obtained by electric arc spraing for renovation of parts of machines and vehicle mechanisms","authors":"A. Lopata, M. Holovashchuk, L. Lopata, E. Solovuch, S. Katerinich","doi":"10.31891/2079-1372-2022-104-2-80-86","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-80-86","url":null,"abstract":"The robots present the results of investigating the power of coatings, excluding electric arc (EAS) filings, and their comparison with the powers of coatings, excluding gas-flame filings. The porosity of the coating, taken from electric arc filings, was in the range of 8-10%. the adhesion strength was 80…100 MPa. The results of the investigations show the advantages and purpose of using electric arc sawing to improve and move the capacity of machine parts and transport mechanisms. In the work, the following factors are added to the process of electric arc sawing: storage of fuel sum, distance of sawing, dispersion of sawing and other. on authority cover. In the course of the investigation, the increase in resistance, adhesive strength, coating thickness, the term for the coating thickness, was determined by the parameters of the electric arc filing. The robots have considered the possibility of securing the necessary authorities influencing the surface with the method of advancing the resource of machine parts by way of regulation by the factors of EAS. Regulating the smoothness and temperature of the stream of transporting gas and particles, you can change the diameter of the droplet, increase the width and reduce the oxidation of the coating. The results of comparative analysis of the properties of coatings applied by electric arc spraying (EAS) using the products of combustion of propane-air mixture and gas-flame spraying (FSP) using gas-air mixture are presented. Under optimal conditions of the spraying process, the porosity of the coatings obtained by electric arc spraying is much lower compared to gas-flame spraying: 8-10% and 20-30%, respectively. Adhesion strength of coatings obtained by electric arc spraying increased by 1.8-2.2 times (from 30-40 MPa in gas-flame spraying to 100 MPa in electric arc), wear resistance increased by 2-2yu5 times.","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44161774","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 : 2022-06-25DOI: 10.31891/2079-1372-2022-104-2-104-111
O.V. Bagrii
Many engineering problems related to the design of structures and machines, the mathematical description of technological processes, etc., are reduced to the need to solve a plane problem for materials with a significant effect of internal friction on their deformation. Such materials include a large class of materials in which the compressive strength is greater than tensile. These are composite materials, concretes, rocks, soils, granular, loose, highly fractured materials, as well as structurally heterogeneous materials in which rigid and strong particles are interconnected by weaker layers. The laws of deformation and destruction of such materials differ significantly from elastic ones. A feature of these laws is an increase in resistance to shear deformations and an increase in the strength of materials with an increase in the magnitude of compressive stresses. This is associated with the influence of internal Coulomb friction on the process of their deformation in the limiting and boundary stages. The need to formulate and solve a special boundary value problem for materials with significant internal friction is because the results of solving problems using models of elasticity and plasticity differ significantly from experimental data. The difference increases when approaching the limiting state of discrete materials and depends significantly on the structure of the material and operating conditions. The boundary value problem of the mechanics of a deformable solid is formulated as a system of equations of three types: static, geometric, and physical. For all linear and physically nonlinear problems, provided the deformations are small, the first two groups of equations remain the same. Thus, these differences can be attributed to the inconsistency of the accepted in the calculations of physical relations "stress - strain" and the real laws of deformation of these materials, which are more complex rheological objects than structurally homogeneous solids, liquids or gases. The article uses an approach where the material is immediately considered as quasi-continuous, and the physical equations are based on the experimentally obtained relationships between the invariants of the stress and strain tensors, which consider the influence of both molecular connectivity and internal Coulomb friction.
{"title":"Plane problem of discrete environment mechanics","authors":"O.V. Bagrii","doi":"10.31891/2079-1372-2022-104-2-104-111","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-104-111","url":null,"abstract":"Many engineering problems related to the design of structures and machines, the mathematical description of technological processes, etc., are reduced to the need to solve a plane problem for materials with a significant effect of internal friction on their deformation. Such materials include a large class of materials in which the compressive strength is greater than tensile. These are composite materials, concretes, rocks, soils, granular, loose, highly fractured materials, as well as structurally heterogeneous materials in which rigid and strong particles are interconnected by weaker layers. The laws of deformation and destruction of such materials differ significantly from elastic ones. A feature of these laws is an increase in resistance to shear deformations and an increase in the strength of materials with an increase in the magnitude of compressive stresses. This is associated with the influence of internal Coulomb friction on the process of their deformation in the limiting and boundary stages. \u0000The need to formulate and solve a special boundary value problem for materials with significant internal friction is because the results of solving problems using models of elasticity and plasticity differ significantly from experimental data. The difference increases when approaching the limiting state of discrete materials and depends significantly on the structure of the material and operating conditions. \u0000The boundary value problem of the mechanics of a deformable solid is formulated as a system of equations of three types: static, geometric, and physical. For all linear and physically nonlinear problems, provided the deformations are small, the first two groups of equations remain the same. Thus, these differences can be attributed to the inconsistency of the accepted in the calculations of physical relations \"stress - strain\" and the real laws of deformation of these materials, which are more complex rheological objects than structurally homogeneous solids, liquids or gases. \u0000The article uses an approach where the material is immediately considered as quasi-continuous, and the physical equations are based on the experimentally obtained relationships between the invariants of the stress and strain tensors, which consider the influence of both molecular connectivity and internal Coulomb friction.","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46879962","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 : 2022-06-25DOI: 10.31891/2079-1372-2022-104-2-64-70
O. Bereziuk, V. Savulyak, V. Kharzhevskyi
The article is dedicated to the study of the influence of the chemical composition of the hardened auger by the chromium on its wear during dehydration of solid waste in the garbage truck. Using the rotatable central composition planning of the experiment of the second order by means of the Box-Wilson method, the dependencies of auger wear depending on the chemical composition of the hardened steel and friction path are determined. The responce surfaces of the objective functions are shown – the wearing of the hardened steel and energy consumption of the dehydration process by the hardened auger press of the mixed municipal solid waste according to the influense parameters. It is established that on the friction path s = 56850 m, during the dehydration process of solid waste in the garbage truck, the simultanuous incresing of the carbon content from 0.45% to 2.1%, and the chromium content – from 0.25% to 12%, at the optimum content of the manganese as 0.527% in the hardened steel of the auger, enable to decrease the energy consumption of the dehydration process of solid waste by 25.7 kWh/tons, or 10.7%. Therefore, it tends to cheaper the process of dehydration in the garbage truck. It is established the expediency of further research for the determination the rational composition and the structural state of the auger material and the ways to increase its wear resistance.
{"title":"The influence of the chemical composition of the hardened auger on its wear during dehydration process of municipal solid waste in the garbage truck","authors":"O. Bereziuk, V. Savulyak, V. Kharzhevskyi","doi":"10.31891/2079-1372-2022-104-2-64-70","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-64-70","url":null,"abstract":"The article is dedicated to the study of the influence of the chemical composition of the hardened auger by the chromium on its wear during dehydration of solid waste in the garbage truck. Using the rotatable central composition planning of the experiment of the second order by means of the Box-Wilson method, the dependencies of auger wear depending on the chemical composition of the hardened steel and friction path are determined. The responce surfaces of the objective functions are shown – the wearing of the hardened steel and energy consumption of the dehydration process by the hardened auger press of the mixed municipal solid waste according to the influense parameters. It is established that on the friction path s = 56850 m, during the dehydration process of solid waste in the garbage truck, the simultanuous incresing of the carbon content from 0.45% to 2.1%, and the chromium content – from 0.25% to 12%, at the optimum content of the manganese as 0.527% in the hardened steel of the auger, enable to decrease the energy consumption of the dehydration process of solid waste by 25.7 kWh/tons, or 10.7%. Therefore, it tends to cheaper the process of dehydration in the garbage truck. It is established the expediency of further research for the determination the rational composition and the structural state of the auger material and the ways to increase its wear resistance.","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47363309","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 : 2022-06-25DOI: 10.31891/2079-1372-2022-104-2-94-103
O. Salenko, М. Khorolska, V. Lopata, E. Solovuch, V. Kulyzhskyi
The paper shows the influence of parameters of the calibration tube jet-abrasive devices on the quality of the process of waterjet cutting critical parts. The results of modeling the formation of two-phase flow and its movement in the calibration tube. Determined that the effects wear ductal fluid of the tube varying intensity and character. In this regard there is the need for functional-oriented approach to the choice of means to ensure the desired geometric parameters of the tube. It is concluded that the decrease in the intensity of ductal Shot material of the tube and thus maintain its geometric parameters is possible by the use of suitable protective coatings , thickness and physical and mechanical characteristics are selected on the basis of Value attributes according to the intensity and type of abrasive loading surface
{"title":"Using a functional approach in solving problems improve performance waterjet equipment","authors":"O. Salenko, М. Khorolska, V. Lopata, E. Solovuch, V. Kulyzhskyi","doi":"10.31891/2079-1372-2022-104-2-94-103","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-94-103","url":null,"abstract":"The paper shows the influence of parameters of the calibration tube jet-abrasive devices on the quality of the process of waterjet cutting critical parts. The results of modeling the formation of two-phase flow and its movement in the calibration tube. Determined that the effects wear ductal fluid of the tube varying intensity and character. In this regard there is the need for functional-oriented approach to the choice of means to ensure the desired geometric parameters of the tube. It is concluded that the decrease in the intensity of ductal Shot material of the tube and thus maintain its geometric parameters is possible by the use of suitable protective coatings , thickness and physical and mechanical characteristics are selected on the basis of Value attributes according to the intensity and type of abrasive loading surface","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":"75 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41245088","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 : 2022-06-25DOI: 10.31891/2079-1372-2022-104-2-87-93
V. Pasika, D. Roman, V. Kharzhevskyi
The kinematic characteristics of the links and individual points of the mechanism are determined by the method of closed geometric contours and the method of designing plans. The forces of interaction between the links of the mechanism are determined by the method of kinetostatics, and the balancing moment by considering the dynamic equilibrium of the crank and the method of power balance. The drawbacks of the structural scheme of the mechanism are revealed and the ways of their elimination are offered. The results of research are presented in the form of graphical dependences of the kinematic parameters of the cutter, reactions or hodographs of forces in kinematic pairs. The moments of resistance forces and inertia forces are determined and the dynamic and mathematical models of the movement of the mechanism are constructed. The technology of determining the power of the electric motor is shown, and its stable area of operation is approximated by a straight line. Kinematic synthesis was performed and a modernized mechanism was obtained in which the cutter can move according to a predetermined law, in particular, without soft shocks at the boundaries of the kinematic cycle and with quasi-constant speed (error up to 5%) in the middle of the kinematic cycle
{"title":"Kinematic analysis and synthesis of cutter movement of slotting machine","authors":"V. Pasika, D. Roman, V. Kharzhevskyi","doi":"10.31891/2079-1372-2022-104-2-87-93","DOIUrl":"https://doi.org/10.31891/2079-1372-2022-104-2-87-93","url":null,"abstract":"The kinematic characteristics of the links and individual points of the mechanism are determined by the method of closed geometric contours and the method of designing plans. The forces of interaction between the links of the mechanism are determined by the method of kinetostatics, and the balancing moment by considering the dynamic equilibrium of the crank and the method of power balance. The drawbacks of the structural scheme of the mechanism are revealed and the ways of their elimination are offered. \u0000The results of research are presented in the form of graphical dependences of the kinematic parameters of the cutter, reactions or hodographs of forces in kinematic pairs. The moments of resistance forces and inertia forces are determined and the dynamic and mathematical models of the movement of the mechanism are constructed. The technology of determining the power of the electric motor is shown, and its stable area of operation is approximated by a straight line. \u0000Kinematic synthesis was performed and a modernized mechanism was obtained in which the cutter can move according to a predetermined law, in particular, without soft shocks at the boundaries of the kinematic cycle and with quasi-constant speed (error up to 5%) in the middle of the kinematic cycle","PeriodicalId":34638,"journal":{"name":"Problemi tribologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42085326","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}
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