Autor: Powałka, Bartosz - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Development of a computational model of a lightweight vertical lathe with the use of superelements
Autorzy:: Powałka, Bartosz
Dolata, Michał
Powiązania:: https://bibliotekanauki.pl/articles/94182.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: lathe
FEM
superelements
weak links
Opis:: This article presents a process of developing a computational model of a light construction vertical lathe. The model is made using the finite elements method. Due to the complexity of the machine tool and the optimization of the computation time superelements have been used in the model. The application of this method has reduced the computation time allowing the analysis of many variants of the mutual position of the machine components. The results of the analyzes led to the indication of weak links of the machine tool. After the improvement of the machine tool construction the movement of the tool tip and the workpiece was much smaller.
Źródło:: Archives of Mechanical Technology and Materials; 2019, 39; 1-6
2450-9469
Pojawia się w:: Archives of Mechanical Technology and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The role of the additive manufacturing process parameters in the shaping of the surface geometric structure during micro-milling
Autorzy:: Krawczyk, Marta
Powalka, Bartosz
Matuszak, Marcin
Fryska, Sebastian
Grzesiak, Dariusz
Figiel, Pawel
Powiązania:: https://bibliotekanauki.pl/articles/99579.pdf
Data publikacji:: 2020
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: micromilling
SLM process
Co-Cr alloys
Opis:: The article presents the results of measurements of the geometric structure of the surface after micro end-milling. In the experiments, coated monolithic super micrograin cemented carbide micro end mills with 2 flutes were employed. The machined parts were additively made of CoCr alloy using Selective Laser Melting technology (SLM). Analyzed variables were the volumetric density of energy supplied by the laser during the SLM process and the feed rate during micro-milling. The results showed a strong influence of SLM process parameters on the surface roughness, which, according to the authors, results from the significant variability of the mechanical properties of the material as a function of the volumetric density of energy supplied during melting.
Źródło:: Journal of Machine Engineering; 2020, 20, 2; 86-93
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Parallel cross-section recognition of geometrical features for selected machine parts
Autorzy:: Golaszewski, Marcin
Krolikowski, Marcin
Powalka, Bartosz
Powiązania:: https://bibliotekanauki.pl/articles/1833767.pdf
Data publikacji:: 2021
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: feature recognition
computer aided reengineering
3D scanning
parametric geometry
Opis:: Increase of automation and autonomy of production is the latest trend incorporated into Industry 4.0 objectives. Production autonomy is very desirable in the field of damaged parts replacement. To fulfill this goal numerous reverse engineering systems have been developed that support geometry recognition from the 3D scan data. This study is focused on converting non-parametric geometry representation of shaft-type elements into a CAD model with a rebuilt feature tree. Algorithms are based on the analysis of parallel cross-sections. The proposed system is also capable of identification of additional geometric features typical for 2.5 axes milling such as pockets, islands and outer walls. The proposed algorithms are optimized to increase efficiency of the process. Initial identification parameters are selected with respect to defined criteria, e.g., identification accuracy, computing power and scanning accuracy. Described algorithms can be implemented in reverse engineering systems.
Źródło:: Journal of Machine Engineering; 2021, 21, 3; 60--79
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Orthotropic model of rolling bearing in modeling lathe spindle dynamics
Autorzy:: Tomaszewski, Jan
Dunaj, Paweł
Powałka, Bartosz
Jasiewicz, Marcin
Powiązania:: https://bibliotekanauki.pl/articles/2086957.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: spindle-bearing system
roller bearing
orthotropic material
lathe
machine tool
Opis:: This paper presents a method for simplified modeling of bearing nodes of a lathe spindle using the finite element method. The proposed modeling methodology is based on the use of an orthotropic material model, which is used to reflect the stiffness properties of the bearing, both in the radial and axial directions. The modeling results have been experimentally verified. This resulted in full agreement of the mode shapes, an average relative error of the natural frequency values of 1.48% and high agreement of the receptance function.
Źródło:: Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 17--31
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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