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

• Type: Article in International Scientific Journal
• Date: 2001

Authors

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

Journal

Title: Engineering Computations

Vol. 18 No. 8

Pages: 1057-1077

ISSN: 0264-4401

Publisher: Emerald

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 18 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 21