Pub Date : 2023-09-30DOI: 10.5604/01.3001.0053.9434
Jarosław Kaczor
The main purpose of using tapered roller bearings is to obtain high bearing stiffness. High bearing stiffnessis achieved by using an appropriate mounting clamp in the bearing system. The mounting clamp, or in otherwords, the pre-clamp, is currently selected based on experience. The literature lacks precise indicationsregarding the size of the initial clamp of the bearing arrangement depending on the external load, and it isselected intuitively. The wrong choice of preload can have a disastrous effect on the life of the entire bearingarrangement.This study aims to determine the maximum preload in the tapered roller bearing system, taking into accountits durability and the elasticity of the bearings and the shaft.In this article, different load variants are analysed, considering the effect of preload on the fatigue life of thebearing system, and recommendations are proposed for the acceptable preload value depending on the size ofthe bearings used.
{"title":"Selection of preload in tapered roller bearingsarrangement according to durability criterion","authors":"Jarosław Kaczor","doi":"10.5604/01.3001.0053.9434","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9434","url":null,"abstract":"The main purpose of using tapered roller bearings is to obtain high bearing stiffness. High bearing stiffnessis achieved by using an appropriate mounting clamp in the bearing system. The mounting clamp, or in otherwords, the pre-clamp, is currently selected based on experience. The literature lacks precise indicationsregarding the size of the initial clamp of the bearing arrangement depending on the external load, and it isselected intuitively. The wrong choice of preload can have a disastrous effect on the life of the entire bearingarrangement.This study aims to determine the maximum preload in the tapered roller bearing system, taking into accountits durability and the elasticity of the bearings and the shaft.In this article, different load variants are analysed, considering the effect of preload on the fatigue life of thebearing system, and recommendations are proposed for the acceptable preload value depending on the size ofthe bearings used.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082729","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 : 2023-09-30DOI: 10.5604/01.3001.0053.9438
Stanisław Strzelecki, Dominik Olbrzymek, Jakub Olbrzymek
The 3-lobe journal bearings have found application in high-speed bearing systems. The bearing design andthe number of lobes and oil grooves ensure good cooling conditions for the bearings. These bearings can bemanufactured as bearings with cylindrical, non-continuous operating surfaces separated by six lubricatinggrooves, bearings with a pericycloid shape of bearing bore and Offset ones.This paper presents the results of the computation of static characteristics of the 3-lobe journal bearing withthe lobes of different geometry. The conditions of an aligned axis of the journal and sleeve and the staticequilibrium position of the journal were assumed. Different bearing length-to-diameter ratio values andrelative and lobe relative clearance were considered. Reynolds' energy and viscosity equations were solvedby means of an iterative procedure. Adiabatic oil film and laminar flow in the bearing gap were considered. Itwas stated that different lobe geometries generate changes in the characteristics of bearings.
{"title":"STATIC CHARACTERISTICS OF 3-LOBE JOURNAL BEARINGSWITH DIFFERENT LOBES OF GEOMETRY","authors":"Stanisław Strzelecki, Dominik Olbrzymek, Jakub Olbrzymek","doi":"10.5604/01.3001.0053.9438","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9438","url":null,"abstract":"The 3-lobe journal bearings have found application in high-speed bearing systems. The bearing design andthe number of lobes and oil grooves ensure good cooling conditions for the bearings. These bearings can bemanufactured as bearings with cylindrical, non-continuous operating surfaces separated by six lubricatinggrooves, bearings with a pericycloid shape of bearing bore and Offset ones.This paper presents the results of the computation of static characteristics of the 3-lobe journal bearing withthe lobes of different geometry. The conditions of an aligned axis of the journal and sleeve and the staticequilibrium position of the journal were assumed. Different bearing length-to-diameter ratio values andrelative and lobe relative clearance were considered. Reynolds' energy and viscosity equations were solvedby means of an iterative procedure. Adiabatic oil film and laminar flow in the bearing gap were considered. Itwas stated that different lobe geometries generate changes in the characteristics of bearings.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082734","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}
Fine-grained high-manganese X120Mn12 grade steel was subjected to a two-stage heat treatment consisting oflong-term isothermal annealing at 510C, which was followed by resaturation in order to reduce the negativeeffect of the brittle carbide carbides of manganese cementite (Fe,Mn)3C. The objective of the experimentwas to elucidate the effects of distinct stages of heat treatment on the properties of high manganese steelwith regard to its resistance to abrasive wear. Supersaturation was performed for eleven different variationsof temperature values ranging from 600C to 1100C to verify its effect on the resistance to abrasion wearunder abrasion conditions. An increase in the supersaturation temperature results in the gradual coagulationand disintegration of the colonies of pearlite and needle-like carbides (Fe,Mn)3C formed during isothermalannealing. At the same time, as a result of the PSN (particle stimulated nucleation) process, the microstructureof austenite undergoes partial refinement, which ultimately increases the resistance to abrasive wear. As aresult of the final microstructural changes resulted in an increase in the resistance to abrasion of approximately6% compared to the initial state.
{"title":"The effect of the austenitisation temperaturefor the two-stage heat treatment of high-manganesesteels on its wear resistance under abrasiveconditions","authors":"Mateusz Dziubek, Małgorzata Rutkowska-Gorczyca, Dominika Grygier","doi":"10.5604/01.3001.0053.9426","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9426","url":null,"abstract":"Fine-grained high-manganese X120Mn12 grade steel was subjected to a two-stage heat treatment consisting oflong-term isothermal annealing at 510C, which was followed by resaturation in order to reduce the negativeeffect of the brittle carbide carbides of manganese cementite (Fe,Mn)3C. The objective of the experimentwas to elucidate the effects of distinct stages of heat treatment on the properties of high manganese steelwith regard to its resistance to abrasive wear. Supersaturation was performed for eleven different variationsof temperature values ranging from 600C to 1100C to verify its effect on the resistance to abrasion wearunder abrasion conditions. An increase in the supersaturation temperature results in the gradual coagulationand disintegration of the colonies of pearlite and needle-like carbides (Fe,Mn)3C formed during isothermalannealing. At the same time, as a result of the PSN (particle stimulated nucleation) process, the microstructureof austenite undergoes partial refinement, which ultimately increases the resistance to abrasive wear. As aresult of the final microstructural changes resulted in an increase in the resistance to abrasion of approximately6% compared to the initial state.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082732","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 : 2023-09-30DOI: 10.5604/01.3001.0053.9441
Krzysztof Wierzcholski, Jacek Gospodarczyk
Skin-tribology is a new scientific domain where the living human skin, lubricated by sweat, cooperates duringthe motion with the non-living surface of clothing material. Such cooperation has an important influence onthe human limbs’ functioning and, consequently, on the bio-frictions and wear effects connected with humanhealth and efficiency. This paper presents new research tendencies and their applications in the contemporaryskin-tribology domain. At first, we described and documented skin-tribology connections between variousscientific domains. In a particular case, some new phenomena are illustrated occurring during the human skinbody lubrication by sweat. For example, sweat properties are considered during the flow inside a thin gapbetween tightly fitting clothing material surfaces and the skin of the human body.This paper presents the meaning and influence of many components in human sweat on dynamic sweatviscosity, health and efficiency.The main results focus on the influence of the non-Newtonian sweat features on the dynamic sweat viscosityvariations across the film thickness in the thin sweat layer and on the load carrying capacity of human limbsand the human Basal Metabolic Rate with Metabolic Age.
{"title":"A NEW RESEARCH ON HUMAN SKIN-LUBRICATION PROBLEMS","authors":"Krzysztof Wierzcholski, Jacek Gospodarczyk","doi":"10.5604/01.3001.0053.9441","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9441","url":null,"abstract":"Skin-tribology is a new scientific domain where the living human skin, lubricated by sweat, cooperates duringthe motion with the non-living surface of clothing material. Such cooperation has an important influence onthe human limbs’ functioning and, consequently, on the bio-frictions and wear effects connected with humanhealth and efficiency. This paper presents new research tendencies and their applications in the contemporaryskin-tribology domain. At first, we described and documented skin-tribology connections between variousscientific domains. In a particular case, some new phenomena are illustrated occurring during the human skinbody lubrication by sweat. For example, sweat properties are considered during the flow inside a thin gapbetween tightly fitting clothing material surfaces and the skin of the human body.This paper presents the meaning and influence of many components in human sweat on dynamic sweatviscosity, health and efficiency.The main results focus on the influence of the non-Newtonian sweat features on the dynamic sweat viscosityvariations across the film thickness in the thin sweat layer and on the load carrying capacity of human limbsand the human Basal Metabolic Rate with Metabolic Age.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082730","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 : 2023-09-30DOI: 10.5604/01.3001.0053.9436
Andrzej Posmyk
The paper presents basic information on the production, structure and tribological properties of a compositechromium-ceramic coating deposited electrolytically on a cast-iron piston ring for a combustion enginedesigned for sliding against a composite cylinder liner. The results of comparative tests of two contacts,i.e. cast-iron GJL-250/AlMC and GJL250+Cr-Al2O3/AlMC, are described. The deposition of the Cr-Al2O3coating on the cast-iron piston ring reduces almost trifold the wear of the piston ring and about 20% thefriction resistance in the contact due to the presence of aluminium oxide particles and fibres. The reinforcingphase removed from the chromium layer polishes the chromium and composite sliding surfaces. The placesleft by the removed particles serve as depots for oil, which reduces the friction forces and minimises oilconsumption. The Al2O3 wear debris decreases the roughness of the surfaces in contact, which additionallyreduces the friction forces according to the friction hypothesis of Ernst and Merchant.
{"title":"TRIBOLOGICAL PROPERTIES OF PISTON RINGS DESIGNEDFOR SLIDING AGAINST COMPOSITE MATERIALSIN LUBRICATED CONTACTS","authors":"Andrzej Posmyk","doi":"10.5604/01.3001.0053.9436","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9436","url":null,"abstract":"The paper presents basic information on the production, structure and tribological properties of a compositechromium-ceramic coating deposited electrolytically on a cast-iron piston ring for a combustion enginedesigned for sliding against a composite cylinder liner. The results of comparative tests of two contacts,i.e. cast-iron GJL-250/AlMC and GJL250+Cr-Al2O3/AlMC, are described. The deposition of the Cr-Al2O3coating on the cast-iron piston ring reduces almost trifold the wear of the piston ring and about 20% thefriction resistance in the contact due to the presence of aluminium oxide particles and fibres. The reinforcingphase removed from the chromium layer polishes the chromium and composite sliding surfaces. The placesleft by the removed particles serve as depots for oil, which reduces the friction forces and minimises oilconsumption. The Al2O3 wear debris decreases the roughness of the surfaces in contact, which additionallyreduces the friction forces according to the friction hypothesis of Ernst and Merchant.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082735","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 : 2023-09-30DOI: 10.5604/01.3001.0053.9435
Katarzyna Piotrowska, Monika Madej
The properties of titanium nitride (TiN:Ag) coatings applied by physical vapour phase deposition technique(PVD) on Ti13Nb13Zr alloy were subject to evaluation. The study presents the results of surface geometricalstructure, adhesion and tribological tests. The geometric structure of the surface was examined using opticalmicroscopy. A scratch test was used to assess adhesion. The model tribological tests were carried out ina rotary motion under technically dry friction conditions, lubricated with Ringer’s solution. In the case oftechnically dry friction, the analysis of the tribological test results indicated that the TiN:Ag coating wascharacterised by higher resistance to motion and lower wear compared to Ti13Nb13Zr. Friction coefficientsregistered during friction subject to lubrication with Ringer’s solution were compared for both materials;however, the surface wear was significantly lower in titanium alloy. The scratch test pointed towards highadhesion of the TiN:Ag coating. The study results provide insight into Ti13Nb13Zr alloy, titanium nitridecoatings and their potential use for surgical instruments.
{"title":"TRIBOLOGICAL PROPERTIES OF SILVER DOPED TITANIUMNITRIDE COATINGS","authors":"Katarzyna Piotrowska, Monika Madej","doi":"10.5604/01.3001.0053.9435","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9435","url":null,"abstract":"The properties of titanium nitride (TiN:Ag) coatings applied by physical vapour phase deposition technique(PVD) on Ti13Nb13Zr alloy were subject to evaluation. The study presents the results of surface geometricalstructure, adhesion and tribological tests. The geometric structure of the surface was examined using opticalmicroscopy. A scratch test was used to assess adhesion. The model tribological tests were carried out ina rotary motion under technically dry friction conditions, lubricated with Ringer’s solution. In the case oftechnically dry friction, the analysis of the tribological test results indicated that the TiN:Ag coating wascharacterised by higher resistance to motion and lower wear compared to Ti13Nb13Zr. Friction coefficientsregistered during friction subject to lubrication with Ringer’s solution were compared for both materials;however, the surface wear was significantly lower in titanium alloy. The scratch test pointed towards highadhesion of the TiN:Ag coating. The study results provide insight into Ti13Nb13Zr alloy, titanium nitridecoatings and their potential use for surgical instruments.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082740","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 : 2023-09-30DOI: 10.5604/01.3001.0053.9437
Małgorzata Rutkowska-Gorczyca, Marcin Wiśniewski, Mateusz Dziubek, Piotr Kowalewski, Marcin Winnicki
The possibility of using the low-pressure cold gas spraying (LPCS) method to create composite coatings hasbeen known and used for a long time. This method makes it possible to create coatings from physically andchemically different powders and to regenerate components damaged during operation. Composite coatingsof titanium and aluminium at different weight concentrations were selected for the study. The research wasconducted to optimise the influence of the chemical composition of the composite coatings on their tribologicalproperties. This paper presents the results of tribological wear testing of composite coatings applied using thelow-pressure cold gas spray (LPCS) method. Wear resistance tests were performed using the ball-on-platemethod in reciprocating motion using a steel ball. Tribological testing of the coatings included determiningthe effect of contact force on wear and the value of the kinetic coefficient of friction of the friction pairs tested.The study determined the optimum chemical composition of the Ti-Al composite coatings to improve wearproperties.
{"title":"TRIBOLOGICAL WEAR ANALYSIS OF Ti-Al COMPOSITE COATINGS APPLIED WITH THE COLD SPRAY METHOD","authors":"Małgorzata Rutkowska-Gorczyca, Marcin Wiśniewski, Mateusz Dziubek, Piotr Kowalewski, Marcin Winnicki","doi":"10.5604/01.3001.0053.9437","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9437","url":null,"abstract":"The possibility of using the low-pressure cold gas spraying (LPCS) method to create composite coatings hasbeen known and used for a long time. This method makes it possible to create coatings from physically andchemically different powders and to regenerate components damaged during operation. Composite coatingsof titanium and aluminium at different weight concentrations were selected for the study. The research wasconducted to optimise the influence of the chemical composition of the composite coatings on their tribologicalproperties. This paper presents the results of tribological wear testing of composite coatings applied using thelow-pressure cold gas spray (LPCS) method. Wear resistance tests were performed using the ball-on-platemethod in reciprocating motion using a steel ball. Tribological testing of the coatings included determiningthe effect of contact force on wear and the value of the kinetic coefficient of friction of the friction pairs tested.The study determined the optimum chemical composition of the Ti-Al composite coatings to improve wearproperties.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082629","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 : 2023-09-30DOI: 10.5604/01.3001.0053.9440
Kamila Ścibisz, Tomasz Kaźmierski, Janusz Krawczyk
Hot rolling of grain-oriented high silicon steel is related to technical problems such as high temperature andlong rolling campaigns with strips of the same width. Numerous methods may be carried out as a solutionto these problems. Before the rolling campaign, all rolls of finishing stands are exchanged. The campaign isscheduled with additional exchanges of rolls on two last stands in two stages. A roll’s wear increases with thequantity of rolled material and may lead to strip profile deformation. Exchanging the rolls ensures the requiredsteel quality and prevents losses caused by quality defects. This work identifies factors affecting the workroll's wear and refers to the material from which rolls are made. This work aimed to determine the wear ofwork rolls of the finishing group rolling mills during the rolling of high-silicon steel. The work presents wearanalyses of 30 rolls. It was analysed depending on roll type and high silicon steel rolled material quantity.Compared wear of rolls after rolling high-silicon steel and black sheet. By analysing the distribution of rollwear along the length of the roll, it was found that the wear of working rolls directly affects the geometry ofthe rolled sheet, which may affect the quality of the strip profile of the rolled sheet.
{"title":"A ROLL’S WEAR DURING HOT ROLLING OF HIGH-SILICONSTEEL AND ITS IMPACT ON THE QUALITY OF A STRIP’SPROFILE","authors":"Kamila Ścibisz, Tomasz Kaźmierski, Janusz Krawczyk","doi":"10.5604/01.3001.0053.9440","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9440","url":null,"abstract":"Hot rolling of grain-oriented high silicon steel is related to technical problems such as high temperature andlong rolling campaigns with strips of the same width. Numerous methods may be carried out as a solutionto these problems. Before the rolling campaign, all rolls of finishing stands are exchanged. The campaign isscheduled with additional exchanges of rolls on two last stands in two stages. A roll’s wear increases with thequantity of rolled material and may lead to strip profile deformation. Exchanging the rolls ensures the requiredsteel quality and prevents losses caused by quality defects. This work identifies factors affecting the workroll's wear and refers to the material from which rolls are made. This work aimed to determine the wear ofwork rolls of the finishing group rolling mills during the rolling of high-silicon steel. The work presents wearanalyses of 30 rolls. It was analysed depending on roll type and high silicon steel rolled material quantity.Compared wear of rolls after rolling high-silicon steel and black sheet. By analysing the distribution of rollwear along the length of the roll, it was found that the wear of working rolls directly affects the geometry ofthe rolled sheet, which may affect the quality of the strip profile of the rolled sheet.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082733","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 : 2023-09-30DOI: 10.5604/01.3001.0053.9439
Bartosz Sułek, Janusz Krawczyk, Marcin Majewski, Natalia Nawida, Krzysztof Plewa
This paper presents the numerical analysis results in Simufact Forming 2016 of the asymmetric cold rollingprocess of S235JR steel. The research determined the effect of kinematic asymmetry, frictional asymmetryand their combination on the strip curvature, as well as the force parameters of the rolling process. During theconducted research, the aim was to determine the parameters of the asymmetric rolling process, allowing thehighest possible reduction of forces (in relation to symmetric rolling) while maintaining the curvature of thestrip with an acceptable value |δ|≤1.5. For this purpose, "process maps" were developed based on the obtainedresults, allowing for selecting the most favourable process parameters for the different rolling reductions.In addition, the results made it possible to determine the effect of the various asymmetries obtained on theprocess forces and strip curvature depending on the size of the rolling reduction.
{"title":"Analysis of the influence of kinematic and frictionasymmetry on the curvature of the strip and forceparameters of the rolling process","authors":"Bartosz Sułek, Janusz Krawczyk, Marcin Majewski, Natalia Nawida, Krzysztof Plewa","doi":"10.5604/01.3001.0053.9439","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9439","url":null,"abstract":"This paper presents the numerical analysis results in Simufact Forming 2016 of the asymmetric cold rollingprocess of S235JR steel. The research determined the effect of kinematic asymmetry, frictional asymmetryand their combination on the strip curvature, as well as the force parameters of the rolling process. During theconducted research, the aim was to determine the parameters of the asymmetric rolling process, allowing thehighest possible reduction of forces (in relation to symmetric rolling) while maintaining the curvature of thestrip with an acceptable value |δ|≤1.5. For this purpose, \"process maps\" were developed based on the obtainedresults, allowing for selecting the most favourable process parameters for the different rolling reductions.In addition, the results made it possible to determine the effect of the various asymmetries obtained on theprocess forces and strip curvature depending on the size of the rolling reduction.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082736","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 : 2023-09-30DOI: 10.5604/01.3001.0053.9425
Joanna Augustyn-Nadzieja, Łukasz Frocisz, Piotr Matusiewicz
The paper presents the results of tests of tribological wear of two Co-Cr-Mo alloys (Wironit LA) andCo-Cr-Mo-W (Colado CC) used to make skeletal prostheses, combined works, implants and metalframeworks for ceramics. The test samples were centrifugally cast using the lost wax method and subjected tohardness measurements, microscopic observations, and a quantitative description of the microstructure. SEMexaminations and EDS analysis of micro-areas on dendritic arms and interdendritic areas were performedtogether. The abrasive wear resistance tests with the use of a T-05 tester in the friction system roller-blockwere conducted in a dry sliding contact under the conditions of a metal-metal contact with the load of 100 Nand for two friction paths, 500 and 1000 m.
本文介绍了两种Co-Cr-Mo合金(Wironit LA)和Co-Cr-Mo- w (Colado CC)的摩擦学磨损试验结果，这些合金用于制造骨骼假体、组合制品、植入物和陶瓷金属框架。测试样品使用失蜡法离心铸造，并进行硬度测量，显微观察和微观结构的定量描述。同时进行了枝晶臂和枝晶间微区sem检查和能谱分析。采用T-05型磨料磨耗试验机，在100 Nand载荷的金属-金属接触条件下，对500和1000 m两个摩擦路径进行了摩擦系统滚子块的磨料耐磨性试验。
{"title":"The correlation between microstructure,mechanical and tribological propertiesin the alloys of Co-Cr protectors with microadditives Mo and W","authors":"Joanna Augustyn-Nadzieja, Łukasz Frocisz, Piotr Matusiewicz","doi":"10.5604/01.3001.0053.9425","DOIUrl":"https://doi.org/10.5604/01.3001.0053.9425","url":null,"abstract":"The paper presents the results of tests of tribological wear of two Co-Cr-Mo alloys (Wironit LA) andCo-Cr-Mo-W (Colado CC) used to make skeletal prostheses, combined works, implants and metalframeworks for ceramics. The test samples were centrifugally cast using the lost wax method and subjected tohardness measurements, microscopic observations, and a quantitative description of the microstructure. SEMexaminations and EDS analysis of micro-areas on dendritic arms and interdendritic areas were performedtogether. The abrasive wear resistance tests with the use of a T-05 tester in the friction system roller-blockwere conducted in a dry sliding contact under the conditions of a metal-metal contact with the load of 100 Nand for two friction paths, 500 and 1000 m.","PeriodicalId":495082,"journal":{"name":"Trybologia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082737","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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