Simulation and optimization of radial extrusion of components by virtual protyping.

• Type: Article in International Conference Proceedings Book
• Date: 1997

Authors

José César de Sá (Author) FEUP; P Martins (Author) Other; S. Peterson (Author) Other; J. Rodrigues (Author) Other; Luísa Costa Sousa (Author) FEUP; Maria Luísa Romariz Madureira (Author) FEUP

Conference proceedings International

Title: WORLD CONGRESS'97, ON DESIGN, SIMULATION & OPTIMIZATION RELIABILITY & APPLICABILITY OF cOMPUTATIONAL METHODS - NAFEMS

Pages: 121-125

WORLD CONGRESS'97, ON DESIGN, SIMULATION & OPTIMIZATION RELIABILITY & APPLICABILITY OF cOMPUTATIONAL METHODS - NAFEMS

Stugart, Alemanha, 09 - ABRIL - 1997

Other information

Abstract (EN): A major disavantage of tradicional cold forging is the inability to forge slender geometries such as tubes as they tend to collapseunder axial forces. Inconsequence hollow parts are most often forged from solid in processes implying some form of backward or forward extrusion, leaving a central web wich is punched out later. A significant form of material waste and a source of component inaccuracy is hereby introduced. A finite element model was used to exploit some evidence, given by early investigations, of the possibillity of achieving sufficiently large plastic deformation of tubes, to enable the production of certain engineering components, by extrusion into a die-cavity. By intruducing some possible performing stages the simulation made it possible to establish the basis for the development of a technology for the near net-shape manufacture of a larger range of hollow part geometries with large savings in material. The finite element model uses a rigid plastic formulation having as main variables velocities and pressure. Incompressibility of plastic deformations is effectively solved by resortingto mixed methods. The interaction of the tools and workpiece are modelled by interface elements. The modell also includes an adptive mesh refinement technique based on an error estimation of the energy norm.

Language: Portuguese

Type (Professor's evaluation): Scientific

No. of pages: 5