Stretch forming is the basic method of aircraft sheet metal forming. Because the ultra-thick skin is easy to be tiled during the stretching process

the finite element model is established based on the analysis of the trajectory design and the resilience stress in this paper. Through the analysis of the super-thick double convex skin

the pretensioning–covering–pull-up loading trajectory is the most suitable

and can effectively guarantee the fitting degree of the parts. At the same time

combining with the finite element analysis of displacement control

pressure control and springback analysis set clamping spacing at 22t

clamping pressure at 7mm

the distribution of stress

amount of thinning and the springback amount of uniform distribution

which experiments that the parameters can effectively control tire degree

and achieve the design requirements.