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Effect of selective laser sintering on stress relaxation in PA12

Szot Wiktor, Bochnia Jerzy, Zmarzły Paweł

Polimery

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2024

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Vol. 69, nr 3

179--185

EN

Effect of selective laser sintering printing orientation (0°, 45°, 90°) on stress relaxation in PA12 was investigated. The results were highly consistent with the Maxwell-Wiechert model, as evidenced by the average values of the fit coefficients Chi2 = 0.00004 and R2 = 0.996. By changing the printing orientation, anisotropy of rheological properties was achieved.

PL

Zbadano wpływ orientacji wydruku selektywnego spiekania laserowego (0°, 45°, 90°) na relaksację naprężeń w PA12. Uzyskano dużą zgodność wyników z modelem Maxwella-Wiecherta, o czym świadczą średnie wartości współczynników dopasowania Chi2 = 0,00004 oraz R2 = 0,996. Zmieniając orientację wydruku uzyskano anizotropię właściwości reologicznych.

2

Badanie płaskości oraz chropowatości powierzchni modeli cienkościennych wykonanych technologią przyrostową Fused Deposition Modeling

Zmarzły Paweł, Klamka Magdalena, Szwej Wiktoria, Wróblewska Eliza

Zarządzanie Przedsiębiorstwem

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2023

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Vol. 26, nr 2

27--32

EN

3D printing technologies are gaining popularity year by year. They allow for a significant improvement in the production of prototypes and utility models. In addition, 3D printing facilitates the production of thin-walled elements and complex shapes, which is difficult when using traditional manufacturing methods. It should be noted that the technological parameters of 3D printing, such as the printing orientation and the thickness of a single layer, are very important because they affect the printing time, material expenditure and the dimensional accuracy of the printed details. There are many types of 3D printers, the operating principle of which and the building material used are different. However, one of the most popular and available types of additive manufacturing is Fused Deposition Technology. Therefore, detailed studies of this technology are particularly desirable by economic entities. The article presents research aimed at assessing the influence of the print direction and the thickness of a single layer of a building material on the flatness deviation and the 3D surface roughness parameters. Special thin-walled models were designed and printed from PLA material using a printer named MakerBot Replicator+. The research results presented in the article showed that the direction of printing and the thickness of a single layer of building material in the Fused Deposition Modeling Technology affect the roughness parameters, flatness and printing time of the produced models.

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Assessment of surface waviness of casting patterns made using 3D printing technologies

Zmarzły Paweł, Gogolewski Damian, Kozior Tomasz

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2023

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Vol. 71, nr 1

art. no. e144585

EN

The application of 3D printers significantly improves the process of producing foundry patterns in comparison to traditional methods of their production. It should be noted that the quality of the surface texture of the foundry pattern is crucial because it affects the quality of the casting mold and eventually the finished casting. In most studies, the surface texture is examined by analyzing the 2D or 3D roughness parameters. This is a certain limitation because, in the case of 3D printing, the influence of technological parameters is more visible for irregularities of a longer range, such as surface waviness. In the paper, the influence of the 3D printing layer thickness on the formation of waviness of the surface of casting patterns was analyzed. Three 3D printers, differing in terms of printing technology and printing material, were tested: PJM (PolyJet Matrix), FDM (fused deposition modeling) and SLS (selective laser sintering). In addition, the surface waviness of patterns manufactured with traditional methods was analyzed. Surface waviness has been measured using the Form Talysurf PGI 1200 measuring system. Preliminary results of the research showed that the layer thickness significantly influences the values of waviness parameters of the surface in the casting patterns made with FDM, PJM and SLS additive technologies. The research results indicated that the smallest surface waviness as defined by parameters Wa, Wq and Wt was obtained for patterns printed using the PJM technology, while the highest was noted when using the FDM technology.

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Report on the topic: “Problems of using reference methods to measure shape contours and surface waviness"

Adamczak Stanisław, Stępień Krzysztof, Zmarzły Paweł, Mathia Thomas G.

Mechanik

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2020

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R. 93, nr 3

50--52, 54--60

EN

The paper discusses the state-of-the-art on research and development of activities relating to wider application of datum-based methods in the field of measurements of surface texture of machine parts. Despite the fact that datum-based methods are well-known, in hitherto practice their application area has been limited. Research activities carried out by authors indicate that datum-based methods can be very useful as a part of computer-aided measurement systems allowing conducting measurements directly on a machine tool (in-situ measurements). One of the results of the research work conducted by authors was proving that datum-based methods can be applied to evaluate cylindricity deviations and, with some limitations, to evaluate surface waviness of machine parts.

PL

Przedstawiono obecny stan badań i prac rozwojowych dotyczących szerszego wykorzystania metod odniesieniowych do pomiarów struktury geometrycznej powierzchni. Chociaż metody te są znane, to dotychczas były stosowane w ograniczonym zakresie. Przeprowadzone prace wykazały dużą przydatność tych metod w skomputeryzowanych systemach kontroli elementów w trakcie realizacji procesu bezpośrednio na stanowiskach wytwórczych, a nawet bezpośrednio na obrabiarce. Efektem badań przeprowadzonych przez autorów było m.in. wykazanie, że metody odniesieniowe mogą być stosowane do oceny zarysu walcowości i w pewnym ograniczonym zakresie – do kontroli falistości powierzchni.

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Model matematyczny oceny wpływu odchyłki okrągłości i falistości powierzchni bieżni łożysk tocznych na poziom generowanych drgań

Zmarzły Paweł

Mechanik

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2019

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R. 92, nr 1

35--37

PL

W artykule zaprezentowano modele matematyczne, opisujące poziom drgań generowanych przez kulkowe łożyska toczne typu 6304-2z w zależności od wartości odchyłki okrągłości i falistości bieżni wewnętrznej oraz zewnętrznej. Modele pozwalają na ustalenie, który typ odchyłek kształtu ma dominujący wpływ na poziom drgań generowanych w określonych zakresach częstotliwości.

EN

The article presents mathematical models allowing to describe the level of vibration generated by ball bearings 6304-2z type depending on the value of roughness and waviness deviations of inner and outer bearings races. This models will allow to estimate what type of shape deviations have dominant influence on the vibration level generated in specific frequency ranges.