Experimental and numerical characterization of friction in high temperature forming process
- Autores: Hamed Aghajani Derazkola
- Directores de la Tesis: Eduardo García Gil (dir. tes.), Alberto Murillo Marrodán (dir. tes.)
- Lectura: En la Universidad de Deusto ( España ) en 2024
- Idioma: inglés
- Tribunal Calificador de la Tesis: Javad Hazrati (presid.), Jon García Barruetabeña (secret.), Tomasz Adam Bulzak (voc.)
- Materias:
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- Resumen
This Ph.D. thesis investigates the intricate interplay between frictional effects and the seamless tube piercing process, focusing on Super Cr13 stainless steel, a critical material in industrial applications. The study initiates in response to a request from Tubos Reunidos, a local tube manufacturer in the Basque Country, to enhance the efficiency and product quality of their piercing operations. The primary objectives are to comprehen the influence of friction at the tooling system-billet interface on pierced tube formability, and energy consumption.
The study commences with the acquisition of energy consumption data and dimensional accuracy information from Tubos Reunidos' actual industrial piercing process involving Super Cr13 stainless steel. A comprehensive FEM model is established based on the realworld dimensions of the piercing process, facilitating simulations and the incorporation of diverse friction models and factors at critical interfaces.
To elucidate the hot fracture behavior and formability of Super Cr13 stainless steel, hot tensile tests are conducted across varying temperatures and strain rates. Metallurgical changes are meticulously analyzed. The results from the hot tensile tests are correlated with the FEM model outcomes to decipher the behavior of Super Cr13 stainless steel during the piercing process and establish the relationship between metallurgical transformations and final tube geometry.
An investigation into the optimal frictional conditions at the tool-tube interfaces is undertaken to minimize the overall energy consumption during seamless tube piercing.
The final phase of the research involves two mobility experiences, totaling 11 months, at Lulea University of Technology and the Soete Laboratory at Ghent University. These experiences delve into the wear mechanisms of the plug at high temperatures, yielding unpublished results.
This compendium-style thesis consists of one book chapter and five published papers in JCR journals. The outcomes of this research not only enhance the products and energy efficiency of Tubos Reunidos but also contribute novel scientific findings hitherto unreported in the literature. These findings hold significant promise for the broader manufacturing community, facilitating advancements in seamless tube piercing processes and materials science.
