{"title":"EFFECT OF ROLL FORCE DECREASE IN HOT ROLLINGOF DP600 STEEL GRADE BY USE OF ROLL GAP LUBRICATION","authors":"Tomasz Kaźmierski, J. Krawczyk","doi":"10.5604/01.3001.0053.6121","DOIUrl":"https://doi.org/10.5604/01.3001.0053.6121","url":null,"abstract":"The force required for plastic deformation of steel in the hot rolling process is an important parameter which impacts roll wear, strip steering in finishing stands, shape and profile of the rolled strip and energy consumption. Theoretically, the roll force could be effectively decreased by rolling strips with higher temperatures and a lower speed or by reducing the strips input thickness. Due to the required mechanical properties of hot rolled strips as well as the continuous drive toward increased rolling line productivity and cost optimisation, in most cases, it is impossible to lower roll force by changing these two parameters. Roll gap lubrication effectively decreases the roll force, and lowering the friction between the work roll's surface and rolled material reduces roll force by 5% to 20%. Lower roll force brings obvious results in lower energy consumption, but even more important are benefits coming from lower work roll wear and improved strip shape and profile. These issues are particularly important during the hot rolling of dual-phase steel, which due to relatively low final rolling temperature (FRT), requires a higher roll force resulting from increased steel yield stress at lower temperatures.","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88613610","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}
{"title":"EFFECT OF HEXAGONAL BORON NITRIDE WITH DIFFERENTPARTICLE GRANULATION ON THE LUBRICATION PROPERTIESOF MINERAL OIL WITH AN ADDITION OF SURFACTANTS","authors":"A. Chodkiewicz, T. Kałdoński","doi":"10.5604/01.3001.0053.6119","DOIUrl":"https://doi.org/10.5604/01.3001.0053.6119","url":null,"abstract":"This paper presents the results of tribological tests of lubricating compositions containing SN150 mineral oilas a base, an additive of solid lubricant in the form of hexagonal boron nitrides (h-BN) of various particlesizes (nano- and micro-) and surfactants: succinic acid imide and sodium di-2-ethylhexyl sulphosuccinate.Particular attention was paid to analysing the properties of hexagonal boron nitrides in the context of theireffect on the tribological properties of the friction node under study. The effects of h-BN particle size, shape,specific surface area and porosity were considered. In addition, tests were carried out to check the surfactants'effect on the tested oil's hexagonal boron nitride sedimentation process. These tests confirmed the positiveeffect of succinic acid imide on maintaining a stable dispersion of h-BN particles in SN-150 mineral oil.Tribological tests were performed on a T-02 tribotester based on the PN-EN ISO 20623:2018-02 standard.The positive effect of hexagonal boron nitride on the lubricating properties of mixtures with SN150 mineraloil was established. In addition, hexagonal boron nitride, with a smaller particle size and a more developedporous structure, had a more favourable effect on improving the lubricity properties evaluated on the T-02tribotester.","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91357136","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}
Julia Lisoń-Kubica, A. Taratuta, M. Antonowicz, M. Basiaga
{"title":"ABRASION RESISTANCE TEST OF THE MODIFIED Ti13Nb13ZrALLOY SURFACE","authors":"Julia Lisoń-Kubica, A. Taratuta, M. Antonowicz, M. Basiaga","doi":"10.5604/01.3001.0053.6124","DOIUrl":"https://doi.org/10.5604/01.3001.0053.6124","url":null,"abstract":"The research describes an atomic layer deposition (ALD) coating method and its application on a new generationof titanium alloy (Ti13Nb13Zr) for biomedical applications. The study aimed to assess the physicochemicalproperties and mechanics of a titanium alloy coated with titanium oxide (TiO2) or aluminium oxide (Al2O3)using the ALD method. The physicochemical properties of the surface coatings were evaluated throughmicroscopic observations, potentiodynamic tests, surface wettability tests, optical profilometry scratch tests,and abrasion tests. Based on the data obtained, different physicochemical properties of the alloy with titaniumnitride and titanium oxide coatings were found. Such differences were dependent on the number of cyclesused and the temperature of the manufacturing process. The coatings have reduced the abrasion coefficient,thus improving the abrasion resistance of the Ti13Nb13Zr alloy, which enables their use within the skeletalsystem. These findings are of practical importance for applying this type of surface modification to varioustypes of miniaturised implants used in the skeletal system.","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89737464","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}
Karolina Goldsztajn, Julia Lisoń-Kubica, J. Jaworska, K. Jelonek, W. Kajzer, J. Szewczenko
{"title":"MECHANICAL PROPERTIES OF POLYMER COATINGSCONTAINING HAP AND ACTIVE SUBSTANCE ON A METALSUBSTRATEWASNOCI","authors":"Karolina Goldsztajn, Julia Lisoń-Kubica, J. Jaworska, K. Jelonek, W. Kajzer, J. Szewczenko","doi":"10.5604/01.3001.0053.6120","DOIUrl":"https://doi.org/10.5604/01.3001.0053.6120","url":null,"abstract":"Titanium alloys are currently widely used in implantation, especially in orthopaedics. However, undesirablereactions caused by aluminium and vanadium ions released from the surface of the most commonly used alloys,Ti6Al4V and Ti6Al7Nb, result in the need to modify the surface of the material to improve biocompatibility.Among the available modification methods, one can mention the application of biodegradable polymercoatings, which, apart from improving biocompatibility by limiting the penetration of alloying element ionsinto the tissue environment, can also be a matrix for the release of mineral (HAp) and active substances. Thepaper attempts to determine the mechanical properties of PLGA polymer coatings containing nanoparticlehydroxyapatite and an active substance (dexamethasone) applied with the ultrasonic spray coating methodon a Ti6Al7Nb alloy substrate. The scope of the research included: surface topography testing using an opticalprofilometer, coating adhesion testing to the substrate using the scratch test method and tribological testing(Pin-On-Disc method).","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88076472","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}
A. Taratuta, J. Lisoń, Alicja Kazik-Kęsik, M. Antonowicz, M. Basiaga
{"title":"STUDY OF THE MECHANICAL AND ANTIBACTERIALPROPERTIES OF SURFACE MODIFIED STEEL FOR MEDICALAPPLICATIONS","authors":"A. Taratuta, J. Lisoń, Alicja Kazik-Kęsik, M. Antonowicz, M. Basiaga","doi":"10.5604/01.3001.0053.6128","DOIUrl":"https://doi.org/10.5604/01.3001.0053.6128","url":null,"abstract":"Various types of metal implants, both in Poland and worldwide, are mainly manufactured from stainlesssteel due to their biocompatibility, strength, and relatively low price. However, any such procedure involvesthe risk of peri-implant infection, stimulated, among other things, by the formation of a bacterial biofilmon the surface of the implant. In this paper, several methods of modifying the surface of steel for medicalapplications were proposed, such as mechanical polishing, electropolishing, sandblasting, and the applicationof a thin surface layer. This was followed by a series of physicochemical and biological tests. The resultsindicate that the titanium nitride coating improved corrosion resistance and reduced bacterial adhesion onthe surface. No significant improvement in abrasion was observed, and the adhesion of the coating closelydepended on the method of preparation.","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87877122","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}
{"title":"THE ASSESSMENT OF THE INFLUENCE OF THE MATERIALUSED ON THE WEAR AND TEAR OF FORKLIFTS AND THEIROPERATIONAL SAFETY","authors":"D. Grygier, A. Kęska","doi":"10.5604/01.3001.0016.2932","DOIUrl":"https://doi.org/10.5604/01.3001.0016.2932","url":null,"abstract":"The degree of wear of forklift forks is not always the effect of long operations or difficult operating conditions.The key parameter influencing the premature elimination of a vehicle from use is selecting an unsuitablematerial to make forks. Metallographic research allowed us to test the material structure and estimate whichmaterials would allow us to extend the exploitation time of the forklift forks and, consequently, increasethe operation safety level by excluding the inappropriate technical condition of a vehicle. The conductedresearch showed that the application of the properly selected heat treatment of steel allowed to obtain materialcharacterised by high hardness and the lowest abrasion resistance, and simultaneously it accounted for thelowest fork wear level. Extending the standard macroscopic wear tests by microscopic tests may constitute anintroduction to the research on standardising the material used to construct forklift forks.","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86112117","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}
M. Kowalski, S. Bernat, J. Kowalczyk, Krystyna Radoń-Kobus, P. Grabowski, M. Madej
{"title":"TRIBOLOGICAL TESTING OF ENVIRONMENTALLY FRIENDLYLUBRICANTS","authors":"M. Kowalski, S. Bernat, J. Kowalczyk, Krystyna Radoń-Kobus, P. Grabowski, M. Madej","doi":"10.5604/01.3001.0016.2933","DOIUrl":"https://doi.org/10.5604/01.3001.0016.2933","url":null,"abstract":"This paper compares the properties of mineral oil with glycerol and water-based oil, and rapeseed-based oil.The obtained research results showed that the friction coefficient for mineral oil has similar characteristics forboth loads (25 N/50 N). Minimal differences were also observed for the rapeseed-based oil. However, the mostsignificant difference was obtained for oil based on glycerol and water, where the friction coefficient increasedby more than 23% under the load of 50 N compared to 25 N. The tests showed very good characteristicsof the oils based on rapeseed oil and the oil based on glycerol and water with additives reducing friction,depending on the applied load. For lower loads, the oil based on glycerol and water has very good anti-wearproperties, whereas the oil based on rapeseed oil has very good anti-wear properties for higher loads. Thus,environmentally friendly oils have similar or better lubricating properties under appropriate conditions thantoxic oils with high additive contents. Hence, they have the potential to replace the commonly used mineraloil.","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88485529","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}
{"title":"ANALYSIS OF FRICTION FORCES IN THE PROCESSOF FORMING MOULDING MASS","authors":"Marek Szewczyk, Marek Szwajka","doi":"10.5604/01.3001.0016.2934","DOIUrl":"https://doi.org/10.5604/01.3001.0016.2934","url":null,"abstract":"Accelerated wear of the moulds' inner surface used in forming loose masses contributes to its frequentreplacement or regeneration. This wear is indirectly influenced by the high pressure accompanying thecompaction process, but the main cause of accelerated wear is the friction that occurs between the die and thecompacted medium. Knowing that the value of the internal pressure in the moulded medium changes withthe change of the distance from the punch, in order to properly understand the phenomena accompanying thefriction that occurs in the mould during the pressing process, its characteristics must be determined. The paperanalyses the distribution of forming pressure inside the mould during the compaction of high-silica sand. Thedeformation on the die surface was measured using strain gauges, and x-ray tomography was used to visualisethe compaction of high-silica sand during the compaction process. The usefulness of an indirect method formeasuring the friction coefficient based on the analysis of die deformation has been demonstrated.","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85516868","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}
{"title":"RESEARCH ON HYDRODYNAMIC PEEK JOURNAL BEARINGSLUBRICATED WITH WATER AND OIL","authors":"Tomasz Żochowski, A. Olszewski, M. Wasilczuk","doi":"10.5604/01.3001.0016.2938","DOIUrl":"https://doi.org/10.5604/01.3001.0016.2938","url":null,"abstract":"The main purpose of the research was to determine the possibilities and experimentally test the benefits ofreplacing conventional oil lubrication with ecological water lubrication. Tests were carried out on a test rigfor hydrodynamic radial bearings under conditions representative of the expected applications for the bearingin water turbines. Bearings made from the polymer material PEEK (polyether ether ketone) were tested understatic loads. The tests were carried out for two types of lubrication: pure water and oil, with a viscosity ofISO VG 46. A comparison of friction coefficients and load-carrying capacity for both lubricants was made.During the tests, an interesting phenomenon of polymer material running in was observed for relatively highpressures when lubricated with a very low-viscosity lubricating medium, i.e., water (pressures in the bearingover 2 MPa).","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"66 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84243497","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}
{"title":"DETERMINATION OF FERROFLUID MAGNETISATION CURVEBASED ON THE MEASUREMENT OF PARTICLE DISTRIBUTIONOBTAINED BY THE DLS METHOD","authors":"Y. Tarasevych, M. Szczęch","doi":"10.5604/01.3001.0016.2935","DOIUrl":"https://doi.org/10.5604/01.3001.0016.2935","url":null,"abstract":"Ferrofluid is a colloid with particles of about 10nm that show magnetic properties. These fluids are used in avariety of applications. Their application is affected by the type of carrier base liquid, the magnetic propertiesof the particle's material, and their size and shape. In practical applications, the magnetisation curve andthe initial magnetic susceptibility are the most important characteristics of any ferrofluid. There are manymethods for determining magnetic characteristics, e.g., using magnetometers. The magnetisation curve canalso be determined on the particle distribution obtained using a transmission electron microscope (TEM).However, the cost of these devices and tests is relatively high. This paper describes a method for determiningthe magnetisation curve based on particle size measurements using the dynamic light scattering (DLS)method. Also, it is necessary to know the saturation magnetisation of the ferrofluid. The obtained magneticcharacteristics were compared with magnetisation curves described in other publications. The purpose ofthis paper is to present the method and determine the influence of various particle distribution parameterson ferrofluid characteristics. The advantage of the method is that a small volume of ferrofluid is requiredin measurements using the DLS method. The measurement can be performed quickly, and the result can beused to estimate the magnetic properties of ferrofluids quickly. These characteristics can be used in analyses(mathematical or numerical calculations) of different devices such as magnetic seals, magnetic couplings,magnetic dampers, etc.","PeriodicalId":35004,"journal":{"name":"Tribologia: Finnish Journal of Tribology","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84597786","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}