Wyniki wyszukiwania - BazTech

1

Study on the resistance to friction in a lead screw-nut contact zone in a car scissor lift

Woźniak Marek, Morawski Jakub, Zakrzewski Sergiusz, Kądziela Arkadiusz, Szydłowski Tomasz, Siczek Krzysztof, Szufa Szymon

Advances in Science and Technology. Research Journal

|

2026

|

Vol. 20, no. 2

78--93

EN

The aim of the study the resistance to friction in the lead screw-nut contact zone in a car scissor lift during its operation. In both cases of lack of lubricant and lubricated contact zone the stick-slip phenomena occurred therein. The analytical model of lead screw-nut assembly driven by electric motor was elaborated. During operation of such an assembly, lubricated stick-slip oscillations occurred with magnitudes smaller compared to the case of dry friction in the contact zone. During lifting the vehicle the friction torque values in the lead screw-nut contact zone lowered due to lowered contact pressure caused by lowered value of the force loading the contact zone due to changing values of angle between the lead screw and the lift arm. Contrary, during lowering the vehicles, the friction torque values in the lead screw-nut contact zone slightly increased. In case of PTFE-based lubricant, the values of the friction torque were over twice as low compared to the case of dry/boundary friction conditions in the analyzed contact zone. The use of lithium grease further lowered twice the friction torque values compared to the case of the PTFE-based lubricant.

2

Study on the effect of loading on the stress distribution in components chosen for the car scissor lift

Woźniak Marek, Morawski Jakub, Zakrzewski Sergiusz, Kądziela Arkadiusz, Siczek Krzysztof

Zeszyty Naukowe Politechniki Morskiej w Szczecinie

|

2025

|

nr 84 (156)

94--105

EN

This study aims to determine the effect of loading on stress distribution in components of the scissor lift during the pushing up or down of the car being analyzed. The FEM models of the lead screw and the lift arms are elaborated and implemented using both Autodesk Inventor and the Solid Edge software. The mathematical model for the lead screw is also developed. The models allowed for the obtaining of the von Mises stress values in the lead screw and in the lift arms. Such stress values in the middle of the FEM screw model coincided with those determined analytically. The obtained values are very sensitive to the level of refinement applied for the size of finite elements. The values of the von Mises stresses in both lower and upper arms varied depending on the lift. For a small value of the lift, they can be up to 35% higher than those in the lead screw. However, for the higher lift, the von Mises stress values in the arms may be equal to or smaller than those in the lead screw.

3

Assessment of Tribological Properties of Innovative Self-lubricating Hybrid Materials Based on the Example of the Ti6Al7Nb–Pe Combination

Kiełb Martyna, Kowalewski Piotr, Ptak Anita

Tribologia

|

2025

|

nr 3

19--28

EN

The paper presents the results of tribological studies of a designed hybrid structure, which can simultaneously exhibit high mechanical strength and self-lubricating properties. Its design is based on a load-bearing structure (matrix) made of a high-strength material, filled with a second component that provides favorable sliding parameters. The study used a combination of the titanium alloy Ti6Al7Nb in the form of a scaffold and polyethylene. The work describes the results of tests on the coefficient of friction, determined during the interaction of the hybrid material with aluminum alloy 7075-T6 in a pin-on-disc configuration under technically dry friction conditions. The wear volume and microhardness of the hybrid, measured using the Vickers method, were also evaluated. The developed material enabled a reduction in the coefficient of friction by approximately 29% and wear by about 27% compared to the titanium matrix. Additionally, an analysis of the hybrid material surface before and after the friction process was carried out using a scanning electron microscope. SEM images revealed the spreading of the polymer component over the surface of the metallic load-bearing structure, which may account for the improvement in tribological performance. The results were compared with reference samples of the matrix and filler materials.

PL

W pracy przedstawiono wyniki badań tribologicznych zaprojektowanej struktury hybrydowej, mogącej przejawiać jednocześnie wysoką wytrzymałość mechaniczną i samosmarowność. W założeniu swoją budowę opiera ona na strukturze nośnej (matrycy), wykonanej z materiału wysokowytrzymałego, wypełnionej drugim komponentem, zapewniającym korzystne parametry ślizgowe. W badaniu wykorzystano kombinację stopu tytanu Ti6Al7Nb w postaci skafoldu i polietylenu. Praca opisuje wyniki badań współczynnika tarcia, wyznaczone podczas współpracy materiału hybrydowego ze stopem aluminium 7075-T6 w skojarzeniu pin-on-disc w warunkach tarcia technicznie suchego. Ocenie poddano także wielkość zużycia oraz mikrotwardość hybrydy, mierzoną metodą Vickersa. Opracowany materiał pozwolił obniżyć współczynnik tarcia o ok. 29%, natomiast zużycie o ok. 27% w porównaniu z tytanową matrycą. Dokonano również analizy powierzchni materiału hybrydowego przed oraz po procesie tarcia, wykorzystując elektronowy mikroskop skaningowy. Obrazy SEM pozwoliły zaobserwować rozsmarowanie komponentu polimerowego na powierzchni metalicznej struktury nośnej, co może stanowić przyczynę polepszenia parametrów tribologicznych. Wyniki porównano z próbkami referencyjnymi materiału matrycy i wypełnienia.

4

Studies of selected tribological characteristics of spiroid gears in the aspect of molecular-mechanical theory of friction

Mazurkow Aleksander, Homik Wojciech

Transport Problems

|

2025

|

T. 20, z. 1

5--16

EN

Spiroid gears are used in various machine drive systems in the automotive and aviation industries. They are characterised by their small size and ability to achieve high gear ratios while maintaining the positioning accuracy of the driven device. This type of gear can operate continuously or at intervals. During the operation at intervals, dry friction can occur between the mating surfaces of the face wheel teeth and the worm threads. The load, geometry and geometrical structure of the mating surfaces and the materials used determine the operation of a gear under dry friction conditions. Determining the parameters associated with dry friction provides an opportunity to develop and calculate gear characteristics, which translates into improved durability and reliability. The paper presents analyses of loads and the normal stress state in the meshing of the worm and face wheel. The authors used Hertz’s theory in their study of the contact between the surfaces of the worm thread and the face wheel tooth. Static friction was analysed in the aspect of the molecular-mechanical theory of friction. The results are presented in the form of diagrams and tables describing the effect of the torque on the friction coefficient, maximum Hertzian pressures and maximum tangential stresses, as well as deformations in the contact zone between the worm and the face wheel. The results indicate that the contact stress state significantly affects selected gear performance parameters, including the friction coefficient.

5

Analiza właściwości tribologicznych stopu Ti13Nb13Zr

Dąbrowski Robert

Inżynieria Materiałowa

|

2025

|

Vol. 46, nr 5

19--23

PL

Celem badań była ocena właściwości tribologicznych medycznego stopu tytanu Ti13Nb13Zr po zaproponowanej obróbce cieplnej, tj. hartowaniu z temp. 800°C i starzeniu w 350, 500 i 650°C. W teście tribologicznym w warunkach tarcia suchego wyznaczono trzy parametry: zużycie masowe, zużycie liniowe i średni współczynnik tarcia. Wykazano, że zastosowanie zabiegu starzenia po hartowaniu i zmiana mikrostruktury stopu od martenzytycznej (α') do dwufazowej (α + β) powoduje zmniejszenie jego zużycia masowego. Ponadto wraz ze wzrostem temperatury starzenia stopu w zakresie 350–650°C odnotowano wzrost współczynnika tarcia w zakresie 0,30–0,40.

EN

The aim of the research was to evaluate the tribological properties of Ti13Nb13Zr medical titanium alloy, after the proposed heat treatment, i.e., hardening from 800°C and aging at 350, 500, and 650°C. In a tribological test under dry friction conditions, three parameters were determined: mass wear, linear wear and average friction coefficient. It has been shown that the application of aging treatment after hardening and changing the alloy microstructure from martensitic (α') to two-phase (α+β) results in a reduction of its mass wear. Furthermore, with increasing aging temperature of the alloy in the range of 350–650°C, an increase in the average friction coefficient was observed, ranging from 0.30 to 0.40.

6

Acrylic resins for manufacturing dental prosthetic restorations – microstructural, micromechanical and tribological tests

Bojko Łukasz, Pałka Paweł, Ryniewicz Anna M., Ryniewicz Wojciech

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2025

|

Vol. 73, nr 5

art. no. e154730

EN

When planning and manufacturing a removable dental prosthesis, efforts should be made to optimally distribute pressure without exceeding the threshold of the physiological capacity of tissues, especially since this type of restoration often causes prosthetic stomatopathies and atrophy of the bone substrate. The aim is to evaluate acrylic prosthetic structures in terms of microstructure, micromechanical parameters, resistance to movement in sliding friction, and wear resistance in the environment of physiological saline and artificial saliva. The research material includes removable prosthetic restorations made of acrylic resins manufactured in the Materials Science Laboratory at the Department of Dental Prosthetics of the Jagiellonian University Medical College. The clinical functionality of the restoration consists of adapting to individual biomechanical forces and creating the most favorable conditions for proper occlusion. Microstructure tests allowed the identification of the surface layer in wear defects and indicated the Vertex Rapid Simplified material as the least susceptible to internal defects and cracks, which may constitute potential places for the growth of fungi and bacteria. Micromechanical tests showed similar values of microhardness and longitudinal elastic moduli of the biomaterials tested. They may determine the strength and extent of the plate. Premacryl Plus had different and lower micromechanical parameters. Tribological tests facilitated a positive assessment of the effect of saliva on friction coefficients and forces. Reducing its value protects the tissues of the prosthetic base against the irritating effects of forces generated by the restoration under chewing and occlusion conditions.

7

Sliding Composite Material Including Glassy Carbon as a Solid Lubricant

Posmyk Andrzej, Myalski Jerzy, Myalska-Głowacka Hanna

Tribologia

|

2024

|

nr 4

85--91

EN

The article presents the basics of producing a sliding composite based on a hypoeutectic aluminum alloy reinforced with glassy carbon foam designed for oil-free contacts of machines and devices. The foam with an open porosity of 90% was infiltrated with liquid silumin. The tribological properties of the matrix material and the produced composite were tested in cooperation with GJL-250 gray cast iron on a pin-on-disc tester. A cast iron pin with a diameter of 5 mm slid on discs with a diameter of 45 mm at a velocity of 0.5 m/s and a pressure of 0.25 MPa. Tests were performed in technically dry friction conditions and with limited lubrication by a single application of 2 mg of oil to the friction zone. As a result of the research, it was found that the presence of 10% of glassy carbon enables the sliding of cast iron against AlSi9NiCuMg silumin under technically dry friction conditions, reducing its wear by 15% and the friction coefficient by 20% at the beginning and by 18% at the end of sliding. With limited lubrication, composite disc wear is nine times lower than in the case of a silumin disc and pin wear is almost immeasurable. This confirms the effectiveness of glassy carbon as a solid lubricant.

PL

W artykule przedstawiono podstawy wytwarzania kompozytu ślizgowego na osnowie podeutektycznego stopu aluminium zbrojonego pianką z węgla szklistego przeznaczonego na bezolejowe skojarzenia maszyn i urządzeń. Piankę o otwartej porowatości 90% infiltrowano ciekłym siluminem. Właściwości tribologiczne materiału osnowy i wytworzonego kompozytu badano we współpracy z żeliwem szarym GJL-250 na testerze „pin-on-disc”. Żeliwny trzpień o średnicy 5 mm ślizgał się po tarczach o średnicy 45 mm z prędkością 0,5 m/s przy nacisku 0,25 MPa. Wykonano badania w warunkach tarcia technicznie suchego i z ograniczonym smarowaniem przez jednorazowe podanie 2 mg oleju do strefy tarcia. W wyniku badań stwierdzono, że obecność 10% węgla szklistego umożliwia współpracę żeliwa z siluminem AlSi9NiCuMg w warunkach tarcia technicznie suchego, zmniejszając jego zużycie 15% i współczynnik tarcia o 20% na początku i o 18% na końcu współpracy. Przy ograniczonym smarowaniu zużycie tarczy kompozytowej jest dziewięciokrotnie mniejsze niż siluminowej, a zużycie trzpienia prawie niemierzalne. Potwierdza to skuteczność działania węgla szklistego jako smaru stałego.

8

Verification of the road construction quality of concrete pavement in terms of skid resistance assessing

Wasilewska Marta, Gierasimiuk Paweł, Zadrożny Krzysztof

Materiały Budowlane

|

2024

|

nr 11

86--96

EN

The paper presents a comparison of friction coefficient results obtained with two SRT-3 devices on a concrete surface before the consent for its use. Measurements were taken in four locations on the S7 expressway. The surface was made using exposed aggregate textured concrete technology. Results were recorded after shotblasting and hydroblasting of the pavement. Significant differences were shown between the reliable friction coefficients (above 0.05) obtained with two devices on the same sections on the same day or in short time intervals. As a consequence, the condition of the road surface cannot be clearly verified. Therefore, the source of variability should be determined and tools that would prevent obtaining divergent results should be implemented in the quality control system. Otherwise, the results do not guarantee a reliable assessment of the surface in terms of preventing its slipperiness and thus user safety.

PL

W artykule porównano wyniki współczynnika tarcia na nawierzchni betonowej przed oddaniem jej do użytkowania i w jego okresie otrzymane dwoma urządzeniami SRT-3. Pomiary te prowadzono w czterech lokalizacjach drogi ekspresowej S7. Nawierzchnię wykonano w technologii betonowej teksturowanej metodą odkrytego kruszywa. Na dwóch odcinkach, spośród czterech, ocenę właściwości przeciwpoślizgowych prowadzono po zabiegach śrutowania i hydroblastingu. Wykazano istotne różnice pomiędzy miarodajnymi współczynnikami tarcia (powyżej 0,05) otrzymanymi dwoma urządzeniami na tych samach odcinkach, w tym samym dniu lub w krótkich odstępach czasu. W konsekwencji nie było możliwe jednoznaczne zweryfikowanie stanu nawierzchni pod kątem oceny właściwości przeciwpoślizgowych. Należałoby określić źródło zmienności i wdrożyć do kontroli systemu jakości takie narzędzia, które zapobiegałyby otrzymaniu rozbieżnych wyników. W przeciwnym wypadku wyniki nie gwarantują rzetelnej oceny nawierzchni w aspekcie zapobiegania jej śliskości, a tym samym bezpieczeństwa użytkowników.

9

Comparison of methods to determine the texture based on measurements with various profilometers

Wasilewska Marta, Wesołowski Mariusz, Blacha Krzysztof

Materiały Budowlane

|

2024

|

nr 7

53--63

EN

The paper presents a comparative analysis of the results of the MPD (Mean Profile Depth) parameter based on three methods for determining the texture of airport pavements using a dynamic profilometer (2D/3D scan CHS (CONTROL HIGH-SPEED scanner)) and stationary profilometers (Circular Track Meter; ElaTexture). The measurements were performed on test sections with different surface technologies, which were located on the Warsaw-Modlin Masovian Airport. Using the R&R (repeatability & reproducibility) method, the ability of measurement systems to monitor the texture was analyzed. The expanded uncertainty of EV (Equipment Variability) repeatability was 0.066 mm, and AV (Appraiser Variability) repeatability was 0.169 mm. The value of repeatability and reproducibility %R&R equal to 21.9% proves that the source of variability in obtaining MPD results is the difference in the recorded area of the test surface in individual measurement systems. Additionally, measurements of the friction coefficient were carried out using the ASFT tester (Airport Surface Friction Trailer), which enabled verification of the skid resistance of the test sections in relation to changes in their texture.

PL

W artykule przedstawiono analizę porównawczą wyników badania parametru MPD (Mean Profile Depth) z wykorzystaniem profilometru dynamicznego (Skaner 2D/3D scan CHS (CONTROL HIGH-SPEED)) i profilometrów stacjonarnych (Circular Track Meter; ElaTexture), które są przeznaczone do oceny tekstury nawierzchni lotniskowych. Pomiary wykonano na odcinkach testowych o zróżnicowanej technologii nawierzchni dróg kołowania Mazowieckiego Portu Lotniczego Warszawa – Modlin. Wykorzystując metodę R&R (repeatability & reproducibility) dokonano analizy zdolności systemów pomiarowych do monitorowania tekstury. Niepewność rozszerzona powtarzalności EV (Equipment Variability) wyniosła 0,066 mm, a odtwarzalność AV (Appraiser Variability) 0,169 mm. Wypadkowa wartość powtarzalności i odtwarzalności %R&R równa 21,9% świadczy, że źródłem zmienności w pozyskiwaniu wyników MPD jest różnica w rozmieszczeniu czujników w poszczególnych systemach pomiarowych, rejestrujących profile powierzchni. Dodatkowo przeprowadzono pomiary współczynnika tarcia testerem ASFT (Airport Surface Friction Trailer), które umożliwiły weryfikację właściwości przeciwpoślizgowych odcinków testowych w odniesieniu do zmian w ich teksturze.

10

Experimental investigation of the movement patterns and deformation of the pigs when passing through a pipe elbow and reducer

Stetsiuk S. M., Doroshenko Ya. V., Doroshenko Yu. I., Filipchuk O. O., Grudz V. Ya.

Journal of Achievements in Materials and Manufacturing Engineering

|

2024

|

Vol. 124, nr 2

49--64

EN

Purpose: Experimentally investigate the movement dynamics of the pigs having various geometric shapes through the pipeline elbows and adapters manufactured from various hyperelastic materials, and assess the risks of their getting stuck in such elements. Experimentally determine the required pressure in the behind-pig space for the experimental pig prototypes to pass through the pipeline elbows and adapters. Design/methodology/approach: Pig prototypes of various geometric shapes (cup-type, cylindrical two-disc type, multi-disc type, dumbbell disc type and three-ball dumbbell type) were designed in order to carry out the experimental investigation. Based on pigs' 3D models, the 3D models of casting mould have been designed and printed on a 3D printer. Pig prototypes were manufactured by filling the casting moulds with silicone compound with hardness of 30 units by Shore A hardness scale and polyurethane with hardness of 80 units by Shore A hardness scale. An experimental glass pipeline was designed and mounted to monitor the dynamics of the solid-cast pig prototype movement through the pipeline elbows. Video recordings of the process allowed us to identify and describe the patterns of pig prototype deformations in the glass pipeline elbow. Pressure was measured in the behind-pig space during the movement of pig prototypes through straight sections, the elbow and the adapter of the experimental pipeline made of metal. Measurements were taken for dry and wet inner walls of glass and metal pipelines. Findings: Cup-type pigs made of silicone compound showed best results in passing through the elbows at the lowest pressure in the behind-pig space (0.33 kgf/cm2). However, suppose the inner wall of the pipeline is dry. In that case, the pig tightness is lost in the pipeline elbow due to significant deformation of the pig, which causes the behind-pig space pressure to increase to 0.71 kgf/cm2 and augments the risk of the pig getting stuck. The dumbbell disc-type and three-ball dumbbell-type pigs made of silicone compound also show good results in passing through the elbows with low pressure in the behind-pig space (up to 0.5 kgf/cm2). Polyurethanepigs are highly rigid; therefore, for them to pass through the pipeline elbows, the pressure in the behind-pig space should be 2-4 times higher than for pigs made of silicone compound. Only the cup-type pig made of silicone compound can pass through the reducing pipe adapters with pressure in the behind-pig space being at least 8 kgf/cm2. Research limitations/implications: The investigation was performed in experimental mode. Further investigation will entail mathematical and numerical modelling of the pig prototypes movement through the pipeline elbows and adapters. Practical implications: The results obtained during the investigation will help to develop a more thorough approach to planning the process of using the pigs to clean the pipelines with elbows and reduce adapters. They allow us to choose the geometric shape and material of the pigs, taking into account the pipeline operating parameters (inlet pressure and flow rate). It is especially appropriate during the first planned pipeline cleaning with pigs. It allows us to minimize the risk of pigs getting stuck in the pipeline. Originality/value: The subject of investigation is patterns of the pig`s friction coefficient, material hardness and geometric shape, impacting its ability to pass through the elbows and reducing adapters, and the value of the required pressure in the behind-pig space.

11

Evaluation of the effects of the application of Ti−C:H DLC coatings obtained by PVD techniques in the kinematic pairs of internal combustion engines and powertrain systems

Murzyński Dawid

Combustion Engines

|

2024

|

R. 63, nr 3

27--33

EN

The article attempts to analyze the possible effects of using Ti−C:H DLC carbon coatings produced by pulsed magnetron sputtering (PVD) to reduce friction coefficient and wear in kinematic pairs found in internal combustion engines and powertrain systems used in automotive vehicles. The aim of such action is primarily to reduce internal losses in the aforementioned units. The coatings were deposited on heat-treated bearing steel 100Cr6, and examined using a scanning electron microscope FEI Quanta 200 Mark II with the chemical analyzer EDS EDAX Genesis XM 2i, tribotester T−01M examining the friction coefficient in the ball-disc correlation and Hommel Werke T8000 profilometers, additionally, in order to check the coating thickness, studies were carried out using the Calotest method. The results obtained indicate that both the friction coefficient and wear are drastically reduced concerning samples on which no DLC coatings were applied.

12

Numerical insights into stress changes induced by longwall mining in faulted rock masses

Tajduś Antoni, Flisiak Jerzy, Tajduś Krzysztof

Archives of Mining Sciences

|

2024

|

Vol. 69, no. 4

615--632

EN

Conducting mining operations in fault zones is a very challenging task, both from a technological perspective and also due to the safety of the miners. Therefore, it is essential to determine the impact of mining parameters on the possibility of fault activation, which in many cases leads to high seismic activity. The article presents the results of numerical analyses of the impact of longwall mining in the vicinity of tectonic faults on the state of stress in the rock masses. The authors demonstrated the influence of the advancement of the longwall face and its direction on the risk of rock burst, both for mining conducted in the footwall and hanging wall.

13

Wear Properties Analysis on Al-Based Automotive Alloy with Varied Levels of Si in Dry, 3.5% NaCl and Seawater Corrosive Environments

Khan Akib Abdullah, Kaiser Mohammad Salim

Archives of Metallurgy and Materials

|

2024

|

Vol. 69, iss. 3

881--890

EN

The wear tests of aluminum based automotive alloys with different Si content in 3.5% NaCl, seawater and dry sliding environment are carried out. A conventional pin-on-disc wear apparatus is used at 2.55 MPa pressure and 0.51 m/s speed for a sliding distance of 923.2 m. The results show that the wear rate and friction coefficient of the alloy decreases with the increase of silicon content up to the eutectic point in all sliding environments. Among the different Si-rich intermetallics formed, especially Mg2Si strengthens the alloys. It is more prominent in the case of a corrosive environment through creating MgO plus SiO2 layers, which protect the corrosive wear and reduce the friction coefficient. Wear test surfaces have shown that Si addition makes the alloys wear-resistant with smooth abrasive grooves covered with oxides.

14

The effect of dispersing agents on the electrophoretic deposition, morphology and adhesion strength of multicomponent TiN/PTFE/PEEK coatings

Fiołek Aleksandra, Zimowski Sławomir, Moskalewicz Tomasz

Archives of Civil and Mechanical Engineering

|

2024

|

Vol. 24, no. 2

art. no. e48, 2024

EN

In this work, multicomponent PEEK coatings with PTFE particles and TiN nanoparticles were developed on Ti-6Al-4V alloy substrates using electrophoretic deposition (EPD) and post-EPD heat treatment. Three different polyelectrolytes involving chitosan, PAZO and sodium alginate were used to enable the co-deposition of all particles on one electrode. All polyelectrolytes were effective and enabled coating deposition through electrosteric stabilization of suspension. The EPD mechanism consisted of the adsorption of the dispersant on the surface of the particles and the imparting of a positive (chitosan) or negative (PAZO, sodium alginate) charge. Heat treatment densified the coatings but also caused microcrack formation in the coating with chitosan, shrinkage of the polymers in the coating with PAZO, and open porosity in the coating with sodium alginate. Coatings obtained from suspension with chitosan showed excellent adhesion strength and scratch resistance, higher that those deposited from suspensions containing PAZO or alginate. The introduction of TiN and PTFE particles into the PEEK matrix resulted in a simultaneous reduction of the friction coefficient and wear rate of the titanium alloy in the case of coatings with chitosan and alginate. These coatings are promising for improving the wear and friction properties of titanium alloys.

15

Study on the friction coefficient between eggshells and powders with various chosen surfaces

Wozniak Marek, Kuchar Maciej, Zakrzewski Sergiusz, Siczek Krzysztof, Obraniak Andrzej, Rylski Adam, Kubiak Przemyslaw

Technologia i Jakość Wyrobów

|

2023

|

R. 68

111--151

EN

Transport of fresh or powdered chicken eggs uses conveyors with elements made of steel or plastics, and surfaces often coated by Teflon. Various forms of eggs contact with said surfaces and are subject to friction processes between them. The frictional resistances cause a load on the devices driving the conveyors and a local and temporary increase in temperature in the contact zones and allow the abrasive wear of both the surfaces of the conveyors, packages and the eggshells themselves. This study aimed to determine such the coefficient of friction and wear intensity at various contacts. The friction and wear tests were conducted on two tribotesters and the results are shown in the article.

PL

Transport świeżych lub sproszkowanych jaj kurzych wykorzystuje przenośniki z elementami wykonanymi ze stali lub tworzyw sztucznych, a powierzchnie często pokryte teflonem. Różne formy jaj stykają się ze wspomnianymi powierzchniami i podlegają procesom tarcia między nimi. Opory tarcia powodują obciążenie urządzeń napędzających przenośniki oraz lokalny i tymczasowy wzrost temperatury w strefach styku i pozwala na zużycie ścierne powierzchni przenośników, pakietów i samych skorupek jaj. Badanie to miało na celu określenie takiego współczynnika tarcia i intensywności zużycia w różnych stykach. Testy tarcia i zużycia przeprowadzono na dwóch tribotesterach, a wyniki pokazano w artykule.

16

Wear performance of Ti-6Al-4 V titanium alloy through nano-doped lubricants

Etri Hamza E. L., Singla Anil Kumar, Özdemir Mehmet Tayyip, Korkmaz Mehmet Erdi, Demirsöz Recep, Gupta Munish Kumar, Krolczyk J. B., Ross Nimel Sworna

Archives of Civil and Mechanical Engineering

|

2023

|

Vol. 23, no. 3

art. no. e147, 2023

EN

Titanium and its alloys are widely utilized in the biomedical sector, they still exhibit poor tribological properties and low wear resistance when employed against even weaker substances. The poor hardness, instability, high coefficient of friction, low load-carrying capacity, and insufficient resistance to not only abrasive but also adhesive wear are further disadvantages of titanium alloys. The focus of this investigation is on the tribological performance of Ti-6Al-4 V alloy in contact with WC carbide abrasive balls when subjected to nanodoped cooling and lubrication conditions. Tribological experiments were executed on Ti-6Al-4 V flat samples using a ball-on-flat tribometer in dry hybrid graphene/boron nitride combination nanoparticles (MQL, nano-3), nanographene with MQL (nano-1), and boron nitride with MQL (nano-2) conditions. After that, the most significant tribological characteristics were investigated, including volume loss, friction coefficient, wear rate, and micrographic structures. The outcomes also demonstrated that the hybrid nanoparticle situation experienced the least amount of volume loss.

17

Impact of friction coefficient variation on temperature field in rotary friction welding of metals – FEM study

Łukaszewicz Andrzej, Józwik Jerzy, Cybul Kamil

Applied Computer Science

|

2023

|

Vol. 19, no. 3

17--27

EN

A mathematical model is presented for investigating the temperature field caused by the rotary friction welding of dissimilar metals. For this purpose, an axisymmetric, nonlinear, boundary value problem of heat conduction is formulated with allowance for the frictional heating of two cylindrical specimens of finite length made of Al 6061 aluminium alloy and 304 stainless steel. The thermo-physical properties of materials change with increasing temperature. It was assumed that the coefficient of friction does not depend on the temperature. The mechanism of heat generation due to friction on the contact surface with the temperature field of samples is considered. The boundary problem of heat conduction was reduced to the set of nonlinear ordinary differential equations at time t relative to the values of temperature T at the finite elements nodes. The numerical solution of the problem was obtained with the inverse 2nd order differentiation method implemented in COMSOL FEM system (finite element method), with time step ∆t=0.1 (s). The influence of various values of friction coefficient is presented.

18

Surface Topography and Tribological Properties of Cutting Tool Coatings

Niemczewska-Wójcik Magdalena, Madej Monika

Advances in Science and Technology. Research Journal

|

2023

|

Vol. 17, no. 6

39--48

EN

The surface topography formed during the technological process has an influence on the wear characteristics and modifies the surface topography of friction components during the operation process, including cutting tools. It is therefore important to carry out research to find the best material and construction solutions to increase their durability and reliability. The research and analysis covered selected coatings (TiN, TiCN, TiAlN) applied to cutting tools for their anti-wear properties. The coatings were obtained through physical vapour deposition PVD. For the purpose of evaluating the tribological properties of the coatings, friction-wear tests were carried out in rotary motion on a ball-on-disc device (ball made of 100 Cr6 steel, discs made of SW7M steel coated with selected coatings) at a constant load (10N), under coolant lubrication conditions. Investigations of the surface topography before and after tribological tests were carried out on a confocal microscope. The friction coefficient and the amount of wear (wear track) of the coatings were shown to vary under the same operating conditions. The highest friction coefficient was obtained for the TiCN coating (0.199), while the lowest for the TiN coating (0.144) – the surface topography of the balls deteriorated (parameters Sq, Sz, Ssk, Sku increased in value). The highest linear wear (281.1 µm) was obtained for the TiAlN coating (the coating was torn halfway through the test), where the ball surface topography has improved (lowered values of parameters Sq, Sz, Ssk, Sku, Spd, Spc).

19

Effect of Water Absorption on Tribological Properties of Thermoplastics Matrix Composites Reinforced with Glass Fibres

Walczak Mariusz, Szala Mirosław, Pieniak Daniel

Advances in Science and Technology. Research Journal

|

2022

|

Vol. 16, no. 2

232--239

EN

The present work investigated the water absorption of thermoplastic matrix composites and their effect on tribological behaviour. Four thermoplastic composites were researched based on Polyamide 6 and Polyamide 66 matrix reinforced with glass fibres. The composites fabricated using the injection moulding technique were immersed in distilled water at room temperature for a water absorption test for 14 days. Dry sliding wear was conducted using a pin-on-disc trbiotester. The coefficient of friction (COF) and the wear rate (K) was determined. The sliding trace was analyzed using a scanning electron microscope (SEM) to reveal the sliding wear mechanism of composites. Studies have shown that polyamide PA6 based composites are less prone to absorb water than PA66 matrix. In addition, the composites richer in fibreglass exhibit lower water absorption. Tribological results indicated that polymer composites showed higher COF and K after water absorption testing. Mean COF and K were in the range of 0.071÷0.321 and 2.51∙10-6÷1.81∙10-4 mm3N-1m-1, respectively. Wear traces SEM analysis revealed that untreated samples are characterized by less intense abrasive and adhesive wear mode than the hydrated polymers. Besides, the degradation process took place primarily at the polymer matrix-fibreglass interfaces.

20

A Comparative Study of Tribological Behavior of Moglice and DK-6(PT) Composites

Pashechko Mykhailo, Ishchenko Аnatoliy, Radionenko Aleksandr, Kindrachuk Myroslav, Tisov Oleksandr

Advances in Science and Technology. Research Journal

|

2022

|

Vol. 16, no. 1

149--157

EN

Authors have produced new polymer-based composite material DK-6(PT) for substitution of Moglice (Diamant) polymer. We manufactured and used sliding-friction test apparatus (pin-on-disc) capable of testing three specimens simultaneously, much reducing time for the test. The monitoring of the material curing process and the Shore hardness test indicate minor difference from reference material. Measurements were carried out during the curing period, since it is important to know change in this parameter over time. The wear test proved that DK-6(PT) composite in the long-time test has good wear resistance: over 80 km of the friction path, the wear loss of both materials is approximately the same. Furthermore, the friction factor of DK-6(PT) is 5–10% less than that of Moglice. Thus, the studied new polymeric composite may compete with well-known material Moglice and significantly cut the expenses for reconditioning of worn slide ways of metal working equipment.