The springback of spherical parts in both integral-gripper and discrete-gripper stretch forming processes were investigated by using explicit-implicit algorithm. The effect on springback value and shape errors of pre-stretching, thickness and materials were studied. The simulation results show that springback and shape errors in the integral-gripper stretch forming are bigger than that in the discrete-gripper stretch forming; the springback gradually decrease and shape errors reduce as pre-strecthing increases, a prior pre-stretching is 1%; the springback and shape errors are gradually reduced as sheet metal gets thicker; the greater the elastic modulus and yield strength of the material, the smaller the springback and shape errors of the formed parts.
[1]
Jianguo Lin,et al.
A method of constructing smooth tool surfaces for FE prediction of springback in sheet metal forming
,
2006
.
[2]
A-M. Yan,et al.
Springback in stretch forming process of aeronautic panel production by finite element simulation
,
2008
.
[3]
J. O. Hallquist,et al.
Use of a coupled explicit—implicit solver for calculating spring-back in automotive body panels
,
1995
.
[4]
G. G. Stokes.
"J."
,
1890,
The New Yale Book of Quotations.
[5]
Ana Reis,et al.
The use of finite element simulation for optimization of metal forming and tool design
,
2001
.