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Influence of Al2O3 nanoparticle mass concentration and aerosol formation parameters on tool vibration during turning of Ti6Al4V titanium alloy

Dylewicz Weronika, Szczotkarz Natalia, Maruda Radosław, Gupta M. K.

International Journal of Applied Mechanics and Engineering

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2024

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Vol. 29, no. 2

52--66

EN

Machining difficult-to-cut materials involves challenging machining conditions, including higher temperatures in the cutting zone, cutting forces and friction. Another important phenomenon is vibration, which is undesirable when manufacturing high quality workpieces. One way to reduce vibration in the cutting zone is to use cooling methods. Due to its environmentally friendly nature, the minimum quantity lubrication (MQL) method has already been widely used in metalworking. However, when combined with nanofluids, it improves the ability of the aerosol to dissipate more heat and increase lubrication in the cutting zone. This paper presents the effect of a polyol ester-based Al2O3 nanofluid due to the varying mass concentration of nanoparticles on the vibration during turning of Ti6Al4V alloy and compares the results with dry cutting and the MQL method without nanoparticles. Four concentrations (0.25−1 wt%), variable nanofluid flow rate E = 0.388−1.182 g/min and air flow rate P = 10−40 l/min were considered. According to the statistical analysis, the most important factor influencing tool vibration was the mass concentration of nanoparticles in the cutting fluid. By combining the MQL method with 0.5 wt% Al2O3, the vibration acceleration RMS values were found to be the lowest. When compared to the MQL method without nanoparticles, the RMS values for dry cutting ranged from 17.8% to 24.9%, and for wet cutting they were reduced by about 10.9-18.5%.

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Evaluation of Structural Powder Steel Properties after High-Temperature Thermomechanical Treatment and Finish Turning

Leksycki Kamil, Feldshtein Eugene, Maruda Radosław, Dyachkova Larisa, Szczotkarz Natalia, Zverko Alexandra

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 1

26--35

EN

High-temperature thermo-mechanical processing (HTTMP) is a combination of plastic deformation and heat treatment operations. Such action makes it possible to increase metal mechanical properties resulting from both mechanical strengthening and heat treatment. As a result, it is possible to achieve high complex of operating characteristics of different types of steel and other alloys. However, there is a lack of information on the applicability of HTTMP of powder steel. These types of steel are very effective substitutes for traditional structural steel but are characterized by poor mechanical properties. This study considers the possibility of using HTTMP for powder steel frame additionally infiltrated by bronze with MoS2 addition to increase mechanical properties of the materials studied. Steel infiltrated, infiltrated and then hardened, infiltrated and then HTTMP treated with strain rates of 30, 50 and 70% were compared. The microstructural properties and hardness of the materials before machining were studied as well as the cutting forces and surface topography of those materials after turning with AH8015 carbide inserts. Cutting forces tests were realized with vc = 157 m/min, f = 0.25 mm/rev and ap = 0.25 mm. Surface topography tests were carried out with vc = 157 m/min, f = 0.25 mm/rev and ap = 0.25 mm. Constant cutting parameters were used to eliminate the effects of rest factors. It was found that the lowest cutting forces (Fc, Fp and Ff), surface roughness parameters (Sa and Sq) and small areas with single high peaks on the machined surface were obtained for infiltrated powder steel with subsequent HTTMP machining under 50% strain rate.

3

Effects of Hard Oxides Reinforcing of Iron-Based MMCs on the Surface Topography Features after Finish Turning

Maruda Radosław, Leksycki Kamil, Feldshtein Eugene, Sąsiadek Eryk, Szczotkarz Natalia, Odważna Magdalena, Ochał Kamil, Gradzik Andrzej

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 1

15--22

EN

Effects of Hard Oxides Reinforcing of Iron-Based MMCs on the Surface Topography Features after Finish Turning

4

Analysis of Power Grid Parameters Depending on the Variable Concentration and Size of Copper Nanoparticles and Aerosol Formation Parameters in the Minimum Quantity Lubrication Method During Turning of Ti6Al4V Titanium Alloy

Szczotkarz Natalia, Maruda Radosław, Leksycki Kamil, Feldshtein Eugene, Wojciechowski Szymon, Jurczak Paweł, Waligóra Michał

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 6

315--324

EN

Titanium alloys belong to the group of difficult-to-cut materials, machining of which leads to a number of challenges including large thermal loads on the cutting inserts and difficulties in obtaining a high quality machined surface. Great cutting forces, in turn, result in increased energy consumption. Therefore, it becomes important to attempt to reduce the amount of power consumed during machining, which can be achieved, among other things, by reducing the value of the coefficient of friction in the cutting zone. This paper presents a study on the influence of the size as well as the Cu nanoparticle concentration added to cutting fluid in MQL method on the power grid parameters while turning of Ti6Al4V titanium alloy. In this research, nanoparticles of 22 nm and 65 nm at concentrations of 0.5 wt% and 0.75 wt% were used. Turning process was carried out with constant cutting parameters and variable aerosol formation parameters, i.e. mass flow rate of nanofluid and volumetric flow rate of air. Based on the study, the use of 22 nm nanoparticles at 0.5 wt% concentration is recommended to achieve the smallest monitored values of the power grid parameters. The statistical analysis revealed that, out of the aerosol formation parameters considered, both the air flow rate and nanofluid flow rate do not significantly affect the values of the analysed power network parameters. However, the most significant factor is the variable nanoparticle size.

5

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.