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Influence of Aluminium Oxide Nanoparticles Mass Concentrations on the Tool Wear Values During Turning of Titanium Alloy Under Minimum Quantity Lubrication Conditions

Szczotkarz Natalia, Adamczuk Krzysztof, Dębowski Daniel, Gupta Munish Kumar

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 1

76--88

EN

Recently, environmental consciousness has led to the quest for ways to minimise negative elements in machining operations that threaten operator health and the environment. Titanium alloys are hard to cut, thus cooling the cutting zone is essential to reduce tool wear. Variations in Al2O3 nanoparticle concentrations supplied to the MQL cutting fluid affect cutting wedge wear during Ti6Al4V alloy turning. A diameter of 15 nm nanoparticles were utilised at 0.25, 0.5, 0.75, and 1 wt% mass concentrations. In the experiments, the flank face wear band width VBB and crater width KB were measured. Comparisons were also made using dry-cutting tools and the MQL approach without nanoparticles. X-ray microanalysis was used to quantify and qualitatively assess the chemical composition of chosen rake surface micro-areas. Studies showed that Al2O3 nanoparticle mass concentration affects tool wear when turning a hard-to-cut alloy. 0.5 and 0.75 wt% mass concentrations had the lowest flank and rake wear of the four mass concentrations. The SEM examination showed that 0.5 wt% mass concentration decreased adhesive wear the most.

2

The impact of additives applied to the lubricant on the burnishing process and tribological properties

Adamczuk Krzysztof, Dębowski Daniel, Wojciechowski Szymon, Kozak Dražan, Zabłocki Miłosz

International Journal of Applied Mechanics and Engineering

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2023

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Vol. 28, no. 2

13--23

EN

The aim of this study was to determine the impact of additions of tungsten carbide and silicon carbide microparticles to the lubricant used in the burnishing process on the tribological properties of friction pairs. The cylinders made of AISI 1045 steel constituted a workpiece. Burnishing was made with a lubricant the SN150 base oil with addition of tungsten carbide and silicon carbide microparticles. The tested materials were burnished with forces of 1000 N and 1500 N. Before and after the burnishing process, the surface roughness and hardness of the tested materials were measured. The study also presents the results of tribological properties of friction pairs with the tested structural materials. It was found that the addition of tungsten carbide microparticles to the base oil in the burnishing process can result in improved surface quality and reduced surface roughness. The results also confirmed the effect of addition of tungsten carbide and silicon carbide to the lubricant used in the burnishing process on tribological properties.

3

Przekaźniki bistabilne - możliwości aplikacyjne i analiza rozwiązań

Tetlak Piotr, Smoleński Robert, Leżyński Piotr, Niewiadomski Piotr, Maruda Radosław, Dębowski Daniel

Wiadomości Elektrotechniczne

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2022

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R. 90, nr 2

17--22

PL

Przekaźniki bistabilne typowo charakteryzują się znacząco zmniejszonym poborem energii elektrycznej w stosunku do rozwiązań klasycznych. Mimo to nie są powszechnie stosowane w przemyśle. W artykule przedstawiono analizę rozwiązań przekaźników bistabilnych obecnych na rynku. Porównano możliwości aplikacyjne przekaźników bistabilnych. Na podstawie badań eksperymentalnych określono warunki sterowania wybranych przekaźników bistabilnych. Przedstawiono również przykładowe obszary aplikacyjne oraz szacunki dotyczące globalnego obniżenia zużycia energii elektrycznej i redukcji gazów cieplarnianych przy zamianie klasycznych przekaźników na przekaźniki bistabilne.

EN

Bistable relays consume less electricity than classic relays. Despite this tremendous advantage, bistable relays are not widely used in industry. The article analyses different solutions of bistable relays available on the market. Then, the application possibilities of bistable relays were analyzed. Based on the experimental research, the control conditions of selected bistable relays have been determined. Some examples of application areas and estimates of global electricity consumption and greenhouse gas reduction when replacing classic relays with bistable relays are also presented.

4

Formation of Surface Topography During Turning of AISI 1045 Steel Considering the Type of Cutting Edge Coating

Szczotkarz Natalia, Maruda Radosław W., Dębowski Daniel, Leksycki Kamil, Wojciechowski Szymon, Khanna Navneet, Królczyk Grzegorz M.

Advances in Science and Technology. Research Journal

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2021

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Vol. 15, no 4

253--266

EN

The paper presents evaluation of the surface topography obtained after turning of AISI 1045 steel with the use of cemented carbide tools diversified in terms of applied titanium-based coatings. During the research, three types of coatings deposited with the PVD method on a P25 sintered carbide insert were compared: nitride-titanium TiN, nitride-aluminum-titanium TiAlN and carbon-titanium TiC in a wide range of variable cutting speeds 125 - 325 m/min and variable feeds 0.05 - 0.25 mm/rev. The quality of the machined surface was assessed on the Sensofar S neox System optical profile meter using the confocal method. The paper presents the results of 3D parameters, contour maps, isometric views and material ratio curves. The surface topography analysis showed that for the TiAlN coated insert, lower surface roughness parameters were observed in the range of lower cutting speeds and higher feeds, while for higher cutting speeds, lower values of the selected 3D parameters were found for the insert with TiC coating. For the insert with TiC coating, the most even distribution of the valleys and ridges of the machined surface roughness was also observed. The research results determined the range of cutting parameters that allow the selection of the appropriate type of titanium-based coating when machining AISI 1045 steel.