An efficient algorithm to estimate optimal preform die shape parameters in forging

• Tipo: Artigo em Revista Científica Internacional
• Data: 2001

Autores

castro, cf (Autor) FEUP; sousa, lc (Autor) FEUP; antonio, cac (Autor) FEUP; de sa, jmac (Autor) FEUP

Revista

Título: Engineering Computations

Vol. 18 Nº 8

Páginas: 1057-1077

ISSN: 0264-4401

Editora: Emerald

Indexação

ISI Web of Knowledge - 16 Citações

Scopus - 18 Citações

Outras Informações

ID Authenticus: P-000-X20

DOI: 10.1108/02644400110409168

Abstract (EN): An optimisation method for design of intermediate die shapes needed in some forging operations is presented The basic problem consists of finding an optimal two-step forging sequence by automatically designing the shape of the preforming tools. The optimisation problem is defined based on an inverse formulation. The objective function of the optimisation problem is a function describing the quality of the obtained part by measuring the die underfill. The finite element method is used to simulate the forging problem. The optimisation method is based on a modified sequential unconstrained minimisation technique and a gradient method The sensitivity-dependent algorithm requires computing the derivatives of the objective function with respect to the design variables defining the preform shapes. A direct differentiation method has been developed for this purpose. The optimisation scheme is demonstrated with two axisymmetric forging examples in which optimal preform dies are obtained.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 21