Catálogo de publicaciones - libros

The Sheet Hydroforming (SHF) and Tube Hydroforming (THF) are more and more commonly used in industry to produce complex sheet or tubular metallic components with High Limit Drawing ratio or large diameter expansions. The large variety of metallic materials that can be used and the complexity of the shapes that can be produced, avoiding the use of complex process sequences render the hydroforming processes well suited for numerous application fields, where the complexity of the parts requires the combination of processes to get lightweight components. The paper presents a synthesis and last developments in terms of hydroforming technologies, materials and limits of formability, as well as modeling strategies accounting the pressure and fluid flow effects. One also focuses on the identification, optimization and then control strategies that are now used in process design development to render as efficient as possible the whole hydroforming process chain. The developments are related to the contribution of Esaform research community and more generally international scientific community during the last ten years.

The paper focuses on the main scientific problems related to hot metal extrusion of thin walled tube, strip and sections, covering analytical approach, 2D- and 3D-numerical simulation and experimental validation. The main physical phenomena and parameter estimation related to thermo-mechanical constitutive equations, shear localization, bearing channel, dry hot friction and metal flow stability in extrusion is treated. The scientific, generic insight and knowledge of these extrusion phenomena should be considered as precompetitive. In industry this knowledge must be integrated with practical experiences and skills in order to be able to predict and control dimensional, surface and microstructure variability during a press cycle, and inspire to innovations in the field of extrusion and its down stream processes such as tube drawing, cold forging, bending and hydroforming.

This paper reports on the state of the art in the simulation of cutting and machining processes. The contributions provided by researchers all over the world and published on the Proceedings of the European Scientific Association for material FORMing (ESAFORM) Conferences are highlighted. They role played by ESAFORM in this field of research has been quite active, as demonstrated by the number of contributions, their relevant scientific content and finally by the vitality of the minisymposium on Modeling of Machining that has been organized since 2001 with no interruptions.