Use of the advanced numerical simulation techniques for the study and improvement of steel-profiles manufacturing processes: Uso de técnicas avanzadas de simulación numérica para el estudio y mejora de procesos de fabricación de perfiles de acero
This work is the result of the European project �TESTRA� (Temperature and Straightness in Sections and Rail Straightening Processes, RFS-CR-03012). In this project the relation between the temperature and bending during the production processes of steel sections and their final residual stresses and...
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| Formato: | text (thesis) |
| Lenguaje: | spa |
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Universidad de La Rioja (España)
2007
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| Acceso en línea: | https://dialnet.unirioja.es/servlet/oaites?codigo=13721 |
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| Sumario: | This work is the result of the European project �TESTRA� (Temperature and Straightness in
Sections and Rail Straightening Processes, RFS-CR-03012). In this project the relation between
the temperature and bending during the production processes of steel sections and their final
residual stresses and bending was studied. The study was focused on structural beams 'I' and
'H' and grooved rail Ri60, used in urban transportation. The aim of the thesis was the modelling
and simulation through Finite Elements (FE) analysis of two main sequential production
processes, common to most of the manufacturing of long steel products: the cooling process
and the straightening process. Thanks to the participation of manufacturing enterprises (PTGGermany
y VA-Austria) and research institutes (BFI-Germany) in the project, was possible to
count on experimental data, very important to verify and calibrate the FE models. The residual
stresses are those stresses that are locked in an object without the application of any external
loads. Several theoretical and experimental studies have proved the negative influence of
residual stresses on the duty properties of steel sections (decrease in the ultimate load of
structural beams and crack propagation in rails, just to mentions some of them). The modelling
and simulations of these processes through FE tools was considered important as the study of
the residual stresses formation and its measurement are complicated to perform not only in
laboratories but much more during normal production in real plants. Additionally to the FE study
of the aforementioned processes, a methodology based on genetic algorithm is proposed to
improve the straightening process. The methodology expects to be an automatic tool used to
find the right rollers� deflections in order to obtain a product with minimum residual stresses and
with a bending value into an acceptable tolerance, i.e. with the best quality characteristics. |
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