Browsing by Author "Bajor, Teresa"

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Access status: Open Access ,
Analysis of influence of process parameters on temperature distribution in profiles extruded from 6xxx-series aluminum alloys
(Wydawnictwa AGH, 2018) Berski, Szymon Arkadiusz; Krakowiak, Marlena; Bajor, Teresa; Kawałek, Anna; Jurczak, Henryk
Changing market preferences regarding expectations in terms of the functionality, properties, and appearance of a finished product place excessive demands on manufacturers. The 6xxx-series alloys are the most commonly used in extrusion, and they have broad applications (e.g., the construction, electronics, automotive, and shipbuilding industries). The development of deformation technology at the design stage reaps unquestionable benefits when planning the production process. Under real conditions, the extrusion of hollow profiles requires the use of pocket dies, whose proper design is a complex process. This paper presents the results of preliminary numerical investigations of the extrusion process of structural panels from the 6005A aluminum alloy intended for the construction of transport car bodies. The influence of selected parameters of the extrusion process on the temperature distribution was analyzed in the material. The calculations were made using FEM for a three-dimensional deformation state, taking into account the thermal phenomena occurring during the applied deformation scheme in the extrusion process carried out in a flat die.
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: Open Access ,
Theoretical analysis of the AZ31 magnesium alloy deformation process by a modified method of angular extrusion
(2015) Bajor, Teresa; Krakowiak, Marlena; Berski, Szymon Arkadiusz
The paper presents the results of the numerical modeling of a chosen magnesium alloy deformation process by a modified method of angular extrusion (AE). The research was made using a die with a circular cross-section, where the channels were arranged at right angles relative to each other. The modification concerned the differing values of applied unit strain obtained by changing the material enter/exit diameter ratio. The extrusion process was analyzed for several temperature-velocity variants. The aim of this work was to determine the most favorable conditions of the extrusion process that result in the most uniform stress and strain distribution in the material.