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Wpływ topologii struktury wypełniającej detale wytwarzane przyrostowo na ich właściwości mechaniczne – studium przypadku

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Pawlik J. , Dzienniak D.

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tom nr 1-2

39--43

PL

Niniejszy artykuł omawia wstępne badania wpływu topologii struktur wypełniających na parametry wytrzymałościowe elementów wytworzonych przyrostowo. Autorzy testują próbki wydrukowane w trzech wymiarach o wystandaryzowanych parametrach skorupy zewnętrznej oraz pięciu różnych strukturach wypełniających o wystandaryzowanej masie na maszynie wytrzymałościowej, by sprawdzić doświadczalnie, który typ struktury wypełniającej ma najlepsze parametry wytrzymałości na ściskanie. Wnioski płynące z eksperymentu pozwalają autorom na dalsze rozważania wysokiej wytrzymałości polilaktydowych elementów w szerszym kontekście ich wykorzystania, na przykład jako matryc tłocznikowych czy noży do gięcia arkuszy metalowych.

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Investigation of the Impact of Face Milling Parameters on the Roughness of the Machined Surface for 1.4301 Steel

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Bembenek M. , Dzienniak D. , Dzindziora A. , Sułowski M. , Ropyak L.

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tom Vol. 17, no 4

299--312

EN

The objective of this research was to analyze how different milling parameters impact the roughness of the surface produced during the machining process. Kinematic parameters, such as cutting speed and feed per tooth, as well as geometric parameters, such as axial and radial depth of machining, were considered in various configurations to determine which one had the greatest impact on the surface quality of 1.4301 stainless steel (also known as AISI 304, among other designations). This type of steel is commonly used in a number of industries, such as construction, automotive, food, chemical, decoration, oil, and petrochemical, owing to its favorable properties. It is also relatively cheap. The analyzed roughness parameters included Ra, Rq, Rz, Rt, which, considered collectively, provide a comprehensive picture of the overall surface quality. Based on the results, feed per tooth is the one parameter that was to a large degree responsible for the overall quality roughness of the surface of the analyzed samples. The remaining tested parameters also had an impact on the surface quality, which resulted in a dynamic increase or decrease in roughness (extremes), but not to the same degree as in the case of feed per tooth. At one point, for a relatively low axial depth of cut, a sudden increase in the resulting roughness was recorded.

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Development o the Design of an Experimental Adsorber and Optimization of its Gas-Dynamic Parameters

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Mykhailiuk V. , Dzienniak D. , Kryzhanivskyy Y. , Deineha R. , Stetsiuk R. , Uhryński A. , Rokita T.

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tom Vol. 18, no 6

177--188

EN

Various technologies and equipment are used to reduce greenhouse gas emissions. For example, the method of adsorption is used to capture carbon dioxide (CO2) from the smoke emissions of cement industries. In the adsorption process using zeolites, devices such as adsorbers are typically employed. Zeolites, a versatile group of aluminosilicate materials, are known for their high surface area and selective adsorption properties, making them effective for CO2 capture. The effectiveness of the adsorber depends on many factors, including its geometric dimensions and shape. Adsorbers with a central inlet flow have uneven gas distribution at the entrance to the adsorbent layer, which reduces their operational efficiency. To eliminate this disadvantage, various devices installed at the output of the adsorber inlet are usually used. Analysis of such devices shows that they do not provide maximum adsorption efficiency. To study the efficiency of zeolite operation for capturing carbon dioxide contained in the smoke gases of cement industries, the design of a laboratory adsorber is proposed featuring a cyclone and distribution device in its lower part. The cyclone prevents the adsorbent from being contaminated by drip fluid, which reduces the efficiency of the adsorption process in the gas, and the distribution device reduces the uniformity of gas distribution at the entrance to the adsorbent layer. This paper proposes a computational fluid dynamics (CFD) model and design of the distribution device, which was analyzed and modified to significantly increase the uniform distribution of gas at the entrance to the adsorbent layer. Compared with other designs of distribution devices, the proposed design is simpler and performs better under varying gas flow rates.