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Effect of Cutting-Edge Geometry on the Machinability of 316L Austenitic Steel

Grabowski Marcin, Małek Marcin, Teimouri Reza, Skoczypiec Sebastian

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 1

110--117

EN

The paper focuses on the problem of selecting the correct tool geometry in high-speed milling of 316L stainless steel. Carbide milling cutters with two configurations of helix angle (40/42 degrees for tool#1 and 35/38 degrees for tool#2) with different cutting edge radiuses rn (i.e. 4 µm, 6 µm, 8 µm, 10 µm and 12 µm) were prepared and their impact on cutting force and roughness were analyzed. The obtained results revealed that the small changes in cutting edge radius rn have a significant effect on both cutting forces and surface roughness. In this context, irrespective to the type of the tool, increasing the cutting edge radius results in further cutting force. However, increasing the cutting edge radius shows different behavior on roughness while using different tool helix angles. For the tool#1, it was found that the surface roughness increases by increasing the cutting edge radius from 6 μm to 12 μm; while in the samples machined by tool #2, increase in cutting edge radius results in reduction of roughness. It was also found that irrespective to the values of cutting edge radius, the cutting force while using tool #1 is slightly less than the tool#2. In addition, the induced milling surface roughness of the samples machined by tool#2 is significantly less than the tool#1 where the mean value of Ra was reduced from 2.55 µm to 0.35 µm

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Empirical Study on the Effect of Tungsten Carbide Grain Size on Wear Resistance, Cutting Temperature, Cutting Forces and Surface Finish in the Milling Process of 316L Stainless Steel

Franczyk Emilia, Małek Marcin

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 6

367--377

EN

Cutting tools made of the WC-Co sintered carbides are now very popular and are widely used in machining of materials. However, there are numerous problems in this area which require more research and need to be studied further. This paper presents the results of an experimental study aimed at discovering the impact of the microstructure, particularly of the tool substrate grain size, on the quality of the machined surface, cutting forces and temperature in the cutting zone, as well as the tool life. In addition, the impact of the feed was considered. The machining process involved side milling of a cuboidal block made of the AISI 316L steel which, due to its specific properties, is widely used in many industries. The tools used in the tests had different WC phase grain size: 0.18, 0.28 and 0.31 μm, respectively, and moreover the middle specimen had also a non-homogeneous structure and an increased content of the Co matrix. The tests proved a significant impact of the tool microstructure on the tool life and the roughness parameters Ra and Rz of the machined surface. The impact of the studied factors on the forces and the temperature in the cutting zone was not as strong, because it did not exceed 20%. The value and the novel character of the paper results from the fact that it concerns a specific case: side milling of the 316L steel with the use of the WC-Co sintered carbide tools, and consequently provides a contribution to solve a practical industrial issue.

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Wypracowanie polskiej technologii redukcji NOx

Małek Marcin

Nowa Energia

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2019

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nr 4

82--83

PL

Celem projektu realizowanego przez Ecoenergię i CBEiOŚ Politechniki Warszawskiej w ramach Programu UE POIG.01.03.01-14-035/12 było opracowanie, przebadanie i wdrożenie technologii selektywnej, niekatalitycznej redukcji tlenków azotu (SNCR) w spalinach kotłów energetycznych o mocy do 300 MW.

4

SNCR po polsku

Krawczyk Piotr, Małek Marcin

Energetyka Cieplna i Zawodowa

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2019

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Nr 3

105--111

PL

Coraz ostrzejsze regulacje unijne dotyczących emisji spalin w energetyce spowodowały, że polskie ciepłownictwo stanęło przed wyzwaniem przystosowania się do nowych warunków prawnych, poprzez wdrożenie odpowiednich rozwiązań, dostosowanych do naszych realiów.