ANALYSIS OF SUPERELASTIC BLOW-FORMING IN A CONICAL CLOSED-DIE

Citation
Ym. Hwang et al., ANALYSIS OF SUPERELASTIC BLOW-FORMING IN A CONICAL CLOSED-DIE, International journal of mechanical sciences, 40(9), 1998, pp. 867
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanics,"Engineering, Mechanical
ISSN journal
0020-7403
Volume
40
Issue
9
Year of publication
1998
Database
ISI
SICI code
0020-7403(1998)40:9<867:AOSBIA>2.0.ZU;2-P
Abstract
A mathematical model using the finite-difference method has been propo sed in this work to examine the plastic deformation behavior of the sh eet during blow-forming in a conical closed die. In the formulation of this mathematical model, nonuniform thinning in the free bulged regio n and the contact condition including the sticking and sliding frictio n modes between the sheet and die are considered. Effects of various f orming parameters such as the die entry radius, friction coefficient, inclined angle of the die, etc., upon the optimized pressurization pro file, forming time and the thickness distribution of products were dis cussed systematically. Furthermore, experiments on superplastic blow-f orming in a conical closed die were carried out using 8090 Al-Li sheet s. It is found that the theoretical predictions agree with experimenta l results. The thickness distributions of the SPF-ed product obtained with different friction coefficients along the die entry, sidewall and bottom are closer to the experimental data than those obtained with a constant friction coefficient. (C) 1998 Elsevier Science Ltd. All rig hts reserved.