Browsing by Author "Borowski, Jacek"

Now showing 1 - 4 of 4

Access status: Open Access ,
Influence of deformation conditions on the rheological properties of 6xxx series Al alloy
(Wydawnictwa AGH, 2018) Bajor, Teresa; Kawałek, Anna; Laber, Konrad; Borowski, Jacek; Sawicki, Sylwester
Knowledge of the characteristics describing the technological properties of the material is the basis for correct numerical simulation and the design of new technological processes or the modernization of existing ones. For each technological process of plastic forming, a set of features should be defined that correctly describe the susceptibility of the material to its shaping in a given process. The paper presents the results of rheological tests of 6xxx series Al alloy, obtained for deformation parameters corresponding to the process of the extrusion of large-size profiles. The effect of deformation conditions on changes in yield stress was determined. Next, the true values of the mathematical model coefficients describing the rheological properties of the tested material were determined using the inverse method, which is the basis for conducting numerical tests.
Access status: Restricted ,
Projekt łącznika do aluminiowych paneli montażowych przeznaczonych do konstrukcji pojazdów specjalnych
(Data obrony: 2019-01-18) Dyja, Jan
Wydział Metali Nieżelaznych
Access status: Restricted ,
Projekt łącznika do aluminiowych paneli montażowych przeznaczonych do konstrukcji pojazdów specjalnych
(Data obrony: 2019-01-18) Dyja, Jan
Wydział Metali Nieżelaznych
Access status: Open Access ,
The application of numerical simulations to analyze the forward extrusion process along with the verification of results and tuning of the numerical model
(Wydawnictwa AGH, 2025) Hawryluk, Marek; Dudkiewicz, Łukasz; Marzec, Jan; Tkocz, Roger; Borowski, Jacek; Ficak, Grzegorz; Jóźwiak, Bartosz; Ziemba, Jacek
The paper presents the application of numerical simulations based on the Finite Element Method (FEM) for analyzing and optimizing the extrusion processes of aluminum and lead. These processes are efficient methods for manufacturing critical machine parts and metal components, ensuring excellent mechanical properties. A detailed analysis was conducted on the numerical modeling of the impact of die taper angles on strain distribution and forming forces during co-extrusion. The study found that a 45-degree angle provides optimal deformation conditions, minimizing extrusion forces and reducing the formation of dead zones compared to a 90-degree angle. Numerical simulations, supplemented by technological trials under semi-industrial conditions and image analysis involving the deformation of the coordinate grid, provided key insights into a material flow, strain distribution, and force parameters. The results emphasize the importance of validating numerical models with semi-industrial experiments to ensure accuracy and reliability, as assuming constant tribological conditions may not reflect actual process conditions, including the formation of dead zones for angles greater than 45°. It was only through a thorough analysis of the actual process and the introduction of variable friction coefficients for individual tools that a dead zone was achieved in the modelling. The findings from this research can serve as the foundation for further optimization and adaptation of technological processes, aiming to further enhance extrusion processes through the use of numerical simulations.